JP2018024033A - Replaceable cutting tool - Google Patents

Abstract

A circumferential phase of a protrusion on a bottom surface of an insert mounting seat and a concave portion of a seating surface of a cutting insert are easily matched. A cutting insert 2 having an annular or cylindrical insert body 2A is inserted into an insert mounting seat 3B formed at a distal end portion 1A of a tool body 1, and a seating surface 2F facing the rear end side is inserted into an insert mounting seat 3B. The clamp screw 4 inserted into the inner peripheral portion 2D of the insert main body 2A is detachably attached by being screwed into the screw hole 1F of the bottom surface 1E, and is attached to the seating surface 2F of the insert main body 2A. A recess 2I is formed on the outer peripheral side of the inner peripheral portion 2D of the insert body 2A, and the bottom surface 1E of the insert mounting seat 3B can be accommodated in the recess 2I at a position facing the recess 2I on the outer peripheral side of the screw hole 1F. The positioning pin 14 having a leading end portion 14A is urged in a direction protruding from the bottom surface 1E so as to be able to appear and retract. [Selection] Figure 5

Description

  The present invention relates to a cutting edge-exchangeable cutting tool in which a cutting insert having an annular or cylindrical insert body is detachably attached to an insert mounting seat formed at the tip of a tool body.

  As such a blade-tip-exchange-type cutting tool, for example, Patent Document 1 discloses an annular or cylindrical cutting insert having a cutting edge and a shaft of a tool main body tip portion having a tip surface abutting against a seating surface of the cutting insert. And a fitting member (fastening member) having a fitting portion fitted to the shaft portion, and an urging force that can be elastically deformed and can urge the fitting portion toward the distal end side with respect to the shaft portion. And a screw member that is inserted into the through hole of the cutting insert and screwed into the screw hole of the shaft portion to removably fix the cutting insert to the shaft portion, and the outer peripheral surface of the cutting insert and the fitting member On the inner peripheral surface, a drive-type rotary tool is described in which a taper surface that gradually decreases in diameter toward the rear end side is formed.

  In such a blade-tip-exchange-type cutting tool, when the screw member is screwed into the screw hole while bringing the tapered surface of the cutting insert into sliding contact with the tapered surface of the fitting member, the cutting insert compresses the urging portion together with the fitting member. Then, it is centered on the shaft portion of the tool body through the fitting member, and is fixed when the seating surface comes into contact with the tip surface of the shaft portion. Therefore, in the case of the drive type rotary tool as described above, the cutting insert is coaxial with the axis of the tool body on the insert mounting seat formed by the tip surface of the tool body and the inner peripheral surface of the fitting member. Since it can be attached, the processing accuracy can be improved. And this patent document 1 also describes forming the recessed part and convex part which can mutually be engaged as a rotation control part of a cutting insert in the seating surface of a cutting insert, and the front end surface of a tool main body.

JP 2013-198971 A

  However, particularly when the cutting insert is fixed by screwing the screw member while sliding the outer peripheral surface of the cutting insert and the inner peripheral surface of the fitting member as in the cutting edge exchangeable cutting tool described in Patent Document 1 In the state in which the cutting insert is placed on the inner periphery of the fitting member, the fitting member is biased toward the tip end side of the shaft portion, and a gap is formed between the seating surface of the cutting insert and the tip surface of the tool body. Therefore, it cannot be confirmed whether or not the phase in the circumferential direction of the concave portion and the convex portion coincides.

  For this reason, if the screw member is screwed with the phase of the concave portion and the convex portion shifted, the cutting insert is attached with the seating surface of the cutting insert of the portion other than the concave portion on the convex portion, The rotation of the cutting insert can no longer be controlled, and the cutting insert may rotate during cutting. This may impair the machining accuracy, and if the screw member is forced to be screwed in, the projection may be crushed. The cutting insert may be broken.

  The present invention has been made under such a background, and a convex portion and a protrusion for restricting the rotation of the cutting insert are formed on the tip surface of the tool body as described above, which is the bottom surface of the insert mounting seat. However, it is possible to provide a cutting edge-exchangeable cutting tool capable of attaching a cutting insert by reliably and easily matching the circumferential phase of the convex portion or projection and the concave portion formed on the seating surface of the cutting insert. It is an object.

  In order to solve the above problems and achieve such an object, the present invention has an annular or cylindrical insert body on the insert mounting seat formed at the tip of the tool body, and is cut to the outer periphery. A cutting insert in which a blade is formed has a seating surface facing the rear end side of the insert body abutting against the bottom surface of the insert mounting seat, and a clamp screw inserted into the inner peripheral portion of the insert body is formed on the bottom surface. It is detachably attached by being screwed into the formed screw hole, and a recess is formed on the seating surface of the insert main body with a gap from the inner peripheral portion to the outer peripheral side of the insert main body, On the bottom surface of the insert mounting seat, a positioning pin having a tip portion that can be accommodated in the concave portion protrudes from the bottom surface at a position facing the concave portion on the outer peripheral side of the screw hole. Characterized in that provided retractably it is urged that direction.

  In the blade-tip-exchangeable cutting tool configured in this way, the positioning pin is urged in the direction facing the recess formed in the seating surface of the insert body on the bottom surface of the insert mounting seat and protrudes and protrudes from the bottom surface. Since the tip of the positioning pin can be accommodated in the recess, the tip of the positioning pin contacts the seating surface of the insert body with the cutting insert placed on the insert mounting seat. In some cases, by setting the protruding height of the protruding positioning pin so that the positioning pin is pushed slightly, the cutting insert placed in this way is rotated in the circumferential direction, so that the phase of the positioning pin and the recess When the two coincide with each other, the distal end portion of the positioning pin is accommodated in the recess, and the cutting insert is positioned.

  Therefore, a plurality of recesses are formed at equal intervals in the circumferential direction on the seating surface of the insert body, and the positioning pins are provided on the bottom surface of the insert mounting seat at positions facing some of the recesses. In addition, at the position facing at least some of the remaining recesses, a protrusion having a lower protrusion height from the bottom surface than the positioning pin in the protruding state is formed on at least some of the remaining recesses. Even if it can be fitted, the phases of at least some of the protrusions and the remaining recesses can be reliably and easily matched. For this reason, the seating surface of the insert body other than the recesses is prevented from climbing onto the protrusions, and the protrusions are fitted into the recesses, and the rotation of the cutting insert during the cutting process is surely restricted, and the insert body and the tool body are also damaged. It becomes possible to prevent.

  In this way, the plurality of recesses are formed at equal intervals in the circumferential direction on the seating surface of the insert main body, and the bottom surface of the insert mounting seat has the above-described positions at positions facing some of the recesses. When a positioning pin is provided, coolant is supplied to the cutting insert at a position facing at least a part of the remaining recesses instead of or together with the projections as described above. By forming the coolant hole to be cooled, cooling and lubrication of the cutting blade of the cutting insert can be promoted. Here, when three or more (for example, four) recesses are formed on the seating surface of the cutting insert, the tip of the positioning pin is accommodated in a part of the recesses (for example, one), and the remaining recesses When protrusions are fitted in some of the recesses (for example, two), the coolant hole is opened to communicate with the remaining part of the recess (for example, the last one). May be.

  As described above, according to the present invention, an annular or cylindrical cutting insert having a recess formed on the seating surface can be accurately positioned in the circumferential direction and attached to the insert mounting seat. Even if protrusions are formed on the mounting seat, the seating surface is prevented from climbing onto the protrusions, and the rotation of the cutting insert is reliably regulated to perform higher-precision machining and prevent damage to the tool body and insert body. You can also

It is a side view which shows the 1st Embodiment of this invention. It is a top view of embodiment shown in FIG. It is the front view which looked at the embodiment shown in Drawing 1 from the tip side. It is the rear view which looked at embodiment shown in FIG. 1 from the rear end side. It is XX sectional drawing in FIG. It is YY sectional drawing in FIG. It is XX sectional drawing in FIG. It is a disassembled perspective view of embodiment shown in FIG. 2A is a front view, FIG. 2B is a rear view, FIG. 2C is an XX sectional view in FIG. 1A, and FIG. 2D is a YY sectional view in FIG. 1A is a perspective view as viewed from the front end side, FIG. 1B is a perspective view as viewed from the rear end side, FIG. 1C is a front view as viewed from the front end side, and FIG. (E) Side view, (f) XX sectional view in FIG. (D), (g) YY sectional view in FIG. (D). (A) Front view seen from the front end side, (b) Rear view seen from the rear end side, (c) Plan view, (d) XX cross section in FIG. FIG. 1 is a perspective view of the washer in the embodiment shown in FIG. 1 as viewed from the front end side, (b) a perspective view as viewed from the rear end side, (c) a front view as viewed from the front end side, and (d) from the rear end side. Viewed rear view, (e) Side view in the direction of arrow X in FIG. (C), (f) Side view in the direction of arrow Y in FIG. (C), (g) XX sectional view in FIG. It is. It is the front view seen from the front end side of the press member of the embodiment shown in FIG. 1, (b) The side view, (c) The back view seen from the rear end side. It is the (a) front view seen from the front end side of the plunger of embodiment shown in FIG. 1, (b) The side view, (c) The back view seen from the rear end side. It is the front view seen from the front end side of the screw member of the embodiment shown in FIG. 1, (b) The side view, (c) The back view seen from the rear end side. It is the (a) front view seen from the front end side of the positioning pin of embodiment shown in FIG. 1, (b) A side view, (c) It is a top view. It is (a) sectional side view before cutting insert attachment of embodiment shown in FIG. 1, (b) It is XX sectional drawing in figure (a). It is a figure which shows the state which cuts (turns) a work material by embodiment shown in FIG. It is a side view which shows the 2nd Embodiment of this invention. FIG. 20 is a plan view of the embodiment shown in FIG. 19. It is the front view which looked at embodiment shown in FIG. 19 from the front end side. It is the rear view which looked at embodiment shown in FIG. 19 from the rear end side. It is XX sectional drawing in FIG. It is YY sectional drawing in FIG. It is XX sectional drawing in FIG. FIG. 20 is an exploded perspective view of the embodiment shown in FIG. 19. FIG. 20A is a front view, FIG. 19B is a rear view, FIG. 19C is an XX sectional view in FIG. 19A, and FIG. 19D is a YY sectional view in FIG. 19A is a perspective view as viewed from the front end side, FIG. 19B is a perspective view as viewed from the rear end side, FIG. 19C is a front view as viewed from the front end side, and FIG. 19D is a rear end side. (E) Side view, (f) XX sectional view in FIG. (D), (g) YY sectional view in FIG. (D). It is the (a) front view seen from the front end side of the fitting member of embodiment shown in FIG. 19, (b) Top view, (c) It is XX sectional drawing in Fig.19 (a). 19A is a perspective view as viewed from the front end side, FIG. 19B is a perspective view as viewed from the rear end side, FIG. 19C is a rear view as viewed from the rear end side, and FIG. ) Side view in the direction of arrow W, (e) side view in direction of arrow X in FIG. (C), (f) YY sectional view in FIG. (C), (g) ZZ section in FIG. FIG. It is the front view seen from the front end side of the press member of the embodiment shown in FIG. 19, (b) The side view, (c) The back view seen from the rear end side. (A) Front view seen from the front end side of the plunger of the embodiment shown in FIG. 19, (b) XX sectional view in FIG. (A), (c) Rear view seen from the rear end side, (d) Side view It is. It is the front view seen from the front end side of the screw member of the embodiment shown in FIG. 19, (b) The side view, (c) The back view seen from the rear end side. It is the front view seen from (a) tip side of the positioning pin of the embodiment shown in Drawing 19, (b) side view, and (c) top view. It is the (a) sectional side view before the cutting insert attachment of embodiment shown in FIG. 19, (b) It is XX sectional drawing in Fig.19 (a). It is a figure which shows the state which cuts (turns) a work material by embodiment shown in FIG.

  1 to 18 show a first embodiment of the present invention. The cutting edge replacement type cutting tool of the present embodiment is such that a cylindrical shaft-shaped tool body 1 is attached to a machine tool such as a multi-tasking machine and is driven to rotate around an axis O, while the tip of the tool body 1 (FIG. 1). 2, FIG. 5, FIG. 6, and FIG. 17, this is a so-called drive type rotary tool that turns the work material W as shown in FIG. 18 with a cutting insert 2 that is detachably attached to 1 A. The present invention is applied, and is particularly suitable for turning a work material W having a relatively small diameter D as shown in FIG.

  In the tool main body 1 according to the present embodiment, the tip 1A is centered on the axis O by a metal material such as steel, and the tip end 1A is more than the rear end (right side in FIGS. 1, 2, 5, 6, and 16). It is formed in a multi-stage outer shape substantially cylindrical with a small outer diameter. The tool body 1 is driven to rotate as described above by gripping the rear end portion as the shank portion 1B by the machine tool.

  In addition, between the tip portion 1A and the shank portion 1B, there is formed a neck portion 1C having a conical outer peripheral surface with an axis O as the outer diameter gradually decreases toward the tip side. An annular surface 1D perpendicular to the axis O is formed between the tip of the neck 1C and the rear end of the tip. Further, the tip surface (tip surface of the tip portion 1A) 1E of the tool body 1 is a flat surface perpendicular to the axis O, and a screw hole 1F is formed along the axis O in the center.

  The cutting insert 2 has a positive type round shape in which the insert body 2A is formed of a hard material such as cemented carbide in a multi-stage (two-stage) truncated cone shape with the axis O as the center as shown in FIG. It is a piece insert, and a cutting edge 2B is formed at the peripheral edge of one circular surface having a large diameter of the insert body 2A. Therefore, this one circular surface is the rake face 2C of the cutting edge 2B, and this rake face 2C is formed as a flat face perpendicular to the axis O in this embodiment, and the diameter thereof, that is, the diameter of the cutting edge 2B is It is larger than the outer diameter of the front end portion 1A of the main body 1 and smaller than the outer diameter of the annular surface 1D.

  The insert main body 2A is formed with a mounting hole 2D having a circular cross section around the axis O having a constant inner diameter so as to penetrate the insert main body 2A along the axis O. Further, a recess 2E having a circular cross section centered on the axis O and having an inner diameter slightly larger than that of the mounting hole 2D is formed in the opening on the rake face 2C side of the mounting hole 2D. The bottom surface of the recess 2E facing the front end in the direction of the axis O is also a flat surface perpendicular to the axis O, and the inner peripheral surface of the recess 2E has a tapered surface that slightly increases in diameter toward the rake face 2C. Is formed.

  Furthermore, the other circular surface with a small diameter of the insert body 2A opposite to the rake surface 2C is a seating surface 2F. Here, in this embodiment, the recess 2G is also formed in the opening of the mounting hole 2D toward the seating surface 2F. The recess 2G on the seating surface 2F side includes an annular groove 2H that circulates around the opening of the mounting hole 2D around the axis O, and a plurality of strips extending radially outward from the annular groove 2H in the direction of the axis O. Concave grooves 2I are provided, and these concave grooves 2I serve as concave portions of the seating surface 2F of the cutting insert 2 in the present embodiment. The annular groove 2H and the recessed groove 2I are equal in depth to each other and shallower than the recess 2E. In this embodiment, four recessed grooves 2I are formed at equal intervals in the circumferential direction. It does not reach the outer peripheral surface of each other and is closed in a semicircular shape as shown in FIG.

  On the other hand, the cylindrical fitting member 3 centered on the axis O is fitted into the outer periphery of the tip portion 1A having a columnar shape centered on the axis O as described above of the tool body 1 so that the axis O is aligned with the axis O. It is attached so as to be movable along the direction. The distal end portion of the inner peripheral surface of the fitting member 3 is a fitting surface 3A whose inner diameter gradually increases toward the distal end side, and is formed by the fitting surface 3A and the tip surface 1E of the tool body 1. The cutting insert 2 is brought into close contact with the fitting surface 3A and the seating surface 2F is brought into contact with the front end surface 1E to the insert mounting seat 3B. The clamp screw 4 is inserted through the washer 5 into the mounting hole 2D, which is the inner peripheral portion of 2A, and is screwed into the screw hole 1F formed in the distal end surface 1E, so that it can be detachably attached.

  The fitting member 3 has the largest outer diameter at the rear end portion in the direction of the axis O, and the intermediate portion has an outer diameter that is one step smaller than the rear end portion, and between the rear end portion and the intermediate portion. From the intermediate portion to the tip in the direction of the axis O, the outer diameter is formed so as to gradually decrease toward the tip. The outer diameter of the rear end portion is substantially equal to or slightly smaller than the outer diameter of the annular surface 1D of the tool body 1. Further, the inner diameter of the fitting member 3 is set to a size that allows the fitting member 3 to be fitted into the tip portion 1A of the tool body 1 as described above except for the fitting surface 3A at the tip portion.

  Further, a plurality of (two in the present embodiment) elongated holes 3C extending in the direction of the axis O are formed in the intermediate portion so as to penetrate in the radial direction, and the tip of the tool body 1 is formed. On the outer periphery of the part 1A, positioning screws 6 are screwed into positions corresponding to these long holes 3C. The heads of these positioning screws 6 are sized so as to be fitted into the elongated holes 3C. Thus, the fitting members 3 are fitted as described above by fitting the heads of the positioning screws 6 into the elongated holes 3C. In addition, it is positioned so as not to rotate in the circumferential direction while allowing movement in the axis O direction.

  Further, a pin mounting hole 1G is formed in the tip surface 1E of the tool body 1 at a position spaced from the screw hole 1F to the outer peripheral side. In the present embodiment, this pin mounting hole 1G is formed perpendicularly to the tip surface 1E and from the tip surface 1E to the rear end side in the axis O direction, extending beyond the annular surface 1D to a position slightly deeper than the screw hole 1F. In addition, a ball mounting hole 1H is formed from the outer peripheral surface of the tip 1A of the tool body 1 to the pin mounting hole 1G so as to penetrate in the radial direction with respect to the axis O. In the present embodiment, the pin mounting hole 1G and the ball mounting hole 1H are formed by one less than the number (four) of the concave grooves 2I as concave portions formed in the cutting insert 2. Yes.

  Further, a projection 1I is formed on the tip surface 1E of the tool body 1 so as to protrude from the tip surface 1E toward the tip side. The projection 1I is formed in a substantially semi-oval shape having an arc portion on the outer peripheral side as shown in FIG. 9A when viewed from the front end side in the axis O direction, and is fitted in the concave groove 2I of the cutting insert 2. In a state where the cutting insert 2 is placed on the insert mounting seat 3B so that one concave groove 2I faces the pin mounting hole 1G, at least of the remaining concave grooves 2I. It is arrange | positioned in the position facing some concave grooves 2I. In the present embodiment, the number (two) of protrusions 1I, which is smaller than the number obtained by subtracting the number of pin mounting holes 1G from the number of concave grooves 2I, are located symmetrically with respect to the axis O at the pin mounting holes 1G. And at equal intervals in the circumferential direction.

  Furthermore, the tool body 1 is formed with a number of coolant holes 7 (one in this embodiment) obtained by subtracting the number of the pin mounting holes 1G and the number of the protrusions 1I from the number of the concave grooves 2I. As shown in FIG. 1, one groove 2I is opposed to the pin mounting hole 1G, and the two protrusions 1I are disposed so as to face the two grooves 2I, and the cutting insert 2 is placed on the insert mounting seat 3B. Thus, the coolant hole 7 is formed so as to open to the front end face 1E at a position facing the remaining one concave groove 2I. That is, the coolant hole 7 is opened on the tip surface 1E so as to form a circle having a center on a circle centering on the axis O passing through the center of the semicircular arc portion of the projection 1I in the tip view. In the circumferential direction, the two protrusions 1I are equally spaced, and the pin mounting hole 1G is disposed on the opposite side with the axis O therebetween.

  The clamp screw 4 is formed of a steel material or the like, like the tool body 1, and includes a screw shaft portion 4A that is screwed into the screw hole 1F and a head portion 4B having a larger diameter than the screw shaft portion 4A. . The outer diameter of the screw shaft portion 4A is made slightly smaller than the inner diameter of the mounting hole 2D of the insert body 2A, and a space is provided between the two in a state where the screw shaft portion 4A is inserted into the mounting hole 2D. An engagement hole that engages with a work tool such as a wrench is formed on the front end surface of the head 4B, and the rear end surface of the head 4B opposite to the front end surface is directed toward the screw shaft portion 4A. It is formed in a tapered surface shape whose outer diameter gradually decreases.

  On the other hand, the washer 5 is formed in an annular shape from, for example, maraging steel having a hardness higher than that of the clamp screw 4 or the same cemented carbide as the insert main body 2A. The rear end portion is a convex portion 5B having a smaller diameter than the flange portion 5A. The flange portion 5A has an outer diameter larger than the inner diameter of the recess 2E on the rake face 2C side of the insert main body 2A and smaller than the diameter of the cutting edge 2B, and around the inner peripheral portion of the tip surface and the convex portion 5B. The rear end surface extending in a straight line is a flat surface perpendicular to the axis O, while the outer peripheral portion of the front end surface is formed in a tapered surface extending toward the rear end side toward the outer peripheral side.

  Further, the convex portion 5B is formed in a tapered surface shape whose outer diameter gradually decreases as the outer peripheral surface thereof moves toward the rear end side, and the taper angle formed by the outer peripheral surface is a taper formed by the inner peripheral surface of the recess 2E. It is set approximately equal to the corner. Furthermore, the protrusion height of the convex part 5B from the rear end surface of the flange part 5A is made larger than the depth of the recess 2E from the rake face 2C of the insert body 2A to the bottom surface facing the front end side in the axis O direction of the recess 2E. In addition, the outer diameter of the projecting end surface 5C, which is the rear end surface of the convex portion 5B, is smaller than the inner diameter of the bottom surface of the recess 2E.

  Therefore, when the convex portion 5B is accommodated so that the protruding end surface 5C contacts the bottom surface of the recess 2E and the insert body 2A and the washer 5 are arranged coaxially, the inner peripheral surface of the recess 2E of the insert body 2A. 5 and the outer peripheral surface of the convex portion 5B of the washer 5, and between the rake face 2C of the insert body 2A and the rear end face of the flange portion 5A facing the rake face 2C, as shown in FIG. There will be an interval around the circumference. Further, a coolant discharge groove 5D is formed on the protruding end surface 5C of the convex portion 5B from the inner periphery to the outer periphery of the protruding end surface 5C.

  The coolant discharge groove 5D is formed so that a cross section along the circumferential direction of the washer 5 has a rectangular shape, and a plurality of such coolant discharge grooves 5D having the same shape and the same size are provided at equal intervals in the circumferential direction. A strip (six strips in this embodiment) is formed. In this embodiment, as shown in FIG. 12, these coolant discharge grooves 5D are formed to have a constant radial width from the inner periphery to the outer periphery of the projecting end surface 5C. The protruding end surface 5C portion remaining between the grooves 5D is formed so as to increase in width toward the outer periphery, but conversely, the groove width of the coolant discharge groove 5D increases so as to increase toward the outer periphery. Then, the protruding end surface 5C portion remaining between the adjacent coolant discharge grooves 5D may have a constant width.

  Further, the inner peripheral portion of the washer 5 is a housing portion 5E in which the head portion 4B of the clamp screw 4 is housed, and the rear end surface of the head portion 4B has an opening on the protruding end surface 5C side of the housing portion 5E. The taper surface has a taper angle equal to that of the taper surface formed, and is formed in a taper surface shape whose inner diameter is gradually reduced toward the projecting end surface 5C, so that the rear end surface of the head 4B can contact. Then, with the rear end surface of the head 4B in contact with the opening on the projecting end surface 5C side of the accommodating portion 5E, the head 4B of the clamp screw 4 has a front end surface as shown in FIGS. The thickness in the direction of the axis O is set so as not to protrude from the flange portion 5A but to be buried in the inner peripheral portion of the washer 5.

  On the other hand, a receiving hole 8 centering on the axis O is formed at the rear end of the tool body 1 with a space in the direction of the axis O from the tip 1A. A biasing member 9 that biases the fitting member 3 toward the distal end side is accommodated. Further, a through hole 10 is formed from the front end of the accommodation hole 8 toward the front end side of the tool body 1. The through hole 10 is fitted by being biased by the biasing member 9. A pressing member 11 that presses the member 3 toward the distal end side is inserted.

  The housing hole 8 has a constant inner diameter except that a female screw portion 8A is formed on the inner periphery of the rear end portion thereof and the opening portion to the rear end face of the tool body 1 is a large diameter portion 8B having a larger inner diameter. The cross section is formed in a circular shape, and the tip thereof is located slightly on the tip side with respect to the boundary between the shank portion 1B and the neck portion 1C. Further, the through hole 10 is inclined and extended toward the outer peripheral side from the front end of the accommodation hole 8 so as to avoid the coolant hole 7 so as to avoid the coolant hole 7 and is open to the annular surface 1D of the tool body 1. In the present embodiment, a plurality (three) of through holes 10 are formed at equal intervals in the circumferential direction, and a pressing member 11 is inserted into each of these through holes 10. The coolant hole 7 also extends from the front end of the accommodation hole 8 to the front end side of the tool body 1 so as to avoid the through hole 10 and opens to the front end surface 1E.

  Here, in this embodiment, the biasing member 9 is a coil spring as shown in FIGS. 5, 6, and 8, and is accommodated in a compressed state in the accommodation hole 8 through the pressing member 11. The member 3 is biased. Further, the through hole 10 is a circular hole having a constant inner diameter, and the pressing member 11 is a small cylindrical pin (push rod) having an outer diameter as shown in FIG. 13 that can be fitted in sliding contact with the through hole 10. The rear end portion protrudes into the accommodation hole 8, and the front end portion of the pressing member 11 urged by the urging member 9 protrudes from the opening portion of the through hole 10 in the annular surface 1D. It abuts on the rear end surface and presses the fitting member 3 toward the front end side. In addition, the front end portion of the pressing member 11 that contacts the rear end surface of the fitting member 3 is formed in a hemispherical shape, and the rear end surface is a flat surface perpendicular to the center line of the cylindrical pressing member 11.

  Furthermore, in the present embodiment, a cylindrical plunger 12 is interposed between the front end of the biasing member 9 and the rear end of the pressing member 11 at the front end of the accommodation hole 8. The plunger 12 has an outer diameter that can be slidably fitted into the receiving hole 8 and an inner diameter that is substantially equal to or smaller than the inner diameter of the biasing member 9 that is a coil spring. The taper surface is inclined toward the rear end side toward the outer peripheral side at an angle at which the rear end surface of the pressing member 11 protruding into the housing hole 8 can contact. Accordingly, the pressing member 11 is urged toward the distal end side by the urging member 9 via the plunger 12 and presses the fitting member 3 toward the distal end side.

  Furthermore, a male screw portion 13A that can be screwed into the female screw portion 8A and a male screw portion 13A thus screwed into the female screw portion 8A are accommodated in the large-diameter portion 8B at the rear end portion of the receiving hole 8. A screw member 13 integrally formed with a flange portion 13B having a possible size is attached. An engagement hole 13C having a regular hexagonal cross section that can be engaged with a work tool such as a wrench is formed at the center of the rear end surface of the screw member 13, and the screw member extends from the bottom of the engagement hole 13C. A coolant supply hole 13 </ b> D having an inner diameter substantially equal to or smaller than the inner diameter of the urging member 9, which is a coil spring, is formed on the tip end surface of the coil spring 13, and opens in the accommodation hole 8.

  Further, in the pin mounting hole 1G formed in the distal end surface 1E of the tool body 1, a positioning pin 14 having a distal end portion 14A that can be accommodated in the concave groove 2I that is a concave portion of the cutting insert 2 is inserted into the insert mounting seat. It is urged in a direction protruding from the tip surface 1E of the tool body 1 which is the bottom surface of 3B, and is provided so as to be able to appear and retract. This positioning pin 14 is formed of a metal material such as steel and has a cylindrical shape with an outer diameter that can be fitted into the pin mounting hole 1G. A notch 14 </ b> B extending in the longitudinal direction is formed, and a bottom surface facing the outer peripheral side of the notch 14 </ b> B is parallel to the longitudinal direction of the positioning pin 14. The front end surface and the rear end surface of the positioning pin 14 are flat surfaces perpendicular to the longitudinal direction except that the outer peripheral portion is chamfered.

  Such a positioning pin 14 has a pin urging member 15 such as a coil spring inserted in the rear end side of the pin mounting hole 1G, and then the tip of the pin mounting hole 1G so as to compress the pin urging member 15. By being inserted to the side, the tool body 1 is biased toward the tip side. When the notch 14B communicates with the ball mounting hole 1H, a metal ball 16 such as a steel ball inserted into the ball mounting hole 1H protrudes into the pin mounting hole 1G and is prevented from coming off by engaging with the notch 14B. Further, when the metal ball 16 is inserted into the ball mounting hole 1H, the fitting member 3 is fitted to the outer periphery of the tip 1A of the tool body 1, so that the metal ball 16 is also prevented from coming off from the ball mounting hole 1H. Is done.

  Thus, the positioning pin 14 attached to the pin attachment hole 1G has the insert attachment seat 3B in a state where the cutting insert 2 is not attached to the insert attachment seat 3B and the metal ball 16 protrudes in contact with the rear end of the notch 14B. The protrusion height in the direction of the axis O from the tip surface 1E of the tool body 1 to the tip portion 14A, which is the bottom surface of 3B, is set to be higher than the protrusion height of the protrusion 1I. When the outer peripheral surface of the insert body 2A is in close contact with the fitting surface 3A of the fitting member 3 and the tip portion 14A is in contact with the seating surface 2F of the insert body 2A, the positioning pin 14 is in the pin mounting hole 1G. The protruding height is set so as to be pushed in slightly.

  Further, the cutting insert 2 is attached to the insert mounting seat 3B while the tip end portion 14A of the positioning pin 14 is received in the concave groove 2I of the cutting insert 2 and abuts against the bottom surface facing the rear end side of the concave groove 2I. In a state where the seating surface 2F is in contact with the tip surface 1E, the positioning pin 14 has a state in which the protrusion height is substantially equal to the protrusion height of the protrusion 1I, and the tip portion 14A is in contact with the bottom surface of the groove 2I. It is set to be maintained.

  In such a blade-tip-exchange-type cutting tool, the pressing member 11 is inserted into the through hole 10, the plunger 12 and the urging member 9 are inserted into the accommodation hole 8, and the pin mounting hole 1G and the ball mounting are mounted as described above. After inserting the pin urging member 15 and the positioning pin 14 and the metal ball 16 into the hole 1H, the fitting member 3 is fitted into the outer periphery of the distal end portion 1A of the tool body 1 and the positioning screw 6 is screwed into the circumferential direction. Then, the male screw portion 13A is screwed into the female screw portion 8A of the accommodation hole 8, and the biasing member 9 is compressed between the screw member 13, the plunger 12, the pressing member 11, and the fitting member 3. The fitting member 3 is pressed and biased toward the distal end side via the plunger 12 and the pressing member 11.

  In this state, the fitting member 3 has the head of the positioning screw 6 in contact with the rear end of the long hole 3 </ b> C and protrudes toward the front end, and the rear end surface of the pressing member 11 contacts the front end surface of the plunger 12. By contacting, a space is provided between the plunger 12 and the hole bottom on the tip side of the accommodation hole 8. Accordingly, in this state, when the cutting insert 2 is placed with the rear end portion of the outer peripheral surface of the insert body 2A in close contact with the fitting surface 3A of the fitting member 3 forming the insert mounting seat 3B, as shown in FIG. Similarly, the seating surface 2F of the insert body 2A is spaced from the tip surface 1E of the tool body 1 that also forms the insert mounting seat 3B, and the tip portion 14A of the positioning pin 14 is a groove 2I that is a recess of the seating surface 2F. It is accommodated and positioned inside or is in contact with the seating surface 2F between the adjacent concave grooves 2I.

  Therefore, when the cutting insert 2 is to be rotated around the axis O from this state, the tip portion 14A of the positioning pin 14 is positioned in the groove 2I when the tip portion 14A is accommodated and positioned in the groove 2I. The cutting insert 2 cannot rotate because it abuts against the wall surface facing the circumferential direction. When the tip 14A is in contact with the seating surface 2F, the tip 14A of the positioning pin 14 is accommodated in the groove 2I when the groove 2I rotates to the position of the tip 14A, and the cutting insert 2 is inserted. Is positioned in the circumferential direction, and no further rotation is possible.

  Therefore, when the cutting insert 2 is positioned in this manner, the screw shaft portion 4A of the clamp screw 4 is inserted into the mounting hole 2D of the insert body 2A via the washer 5 and screwed into the screw hole 1F. The cutting insert 2 whose outer peripheral surface is in close contact with 3A is on the rear end side together with the fitting member 3, the pressing member 11, the plunger 12, and the positioning pin 14 against the urging force of the urging member 9 and the pin urging member 15. And is fixed when the seating surface 2F comes into contact with the tip surface 1E. At this time, among the plurality of grooves 2I in the recess 2G on the seating surface 2F side, at least a part of the remaining grooves 2I other than the groove 2I in which the distal end portion 14A of the positioning pin 14 is accommodated is stored. The projections 1I are fitted into the two concave grooves 2I to fix the cutting insert 2 in the circumferential direction, and the remaining one concave groove 2I communicates with the coolant hole 7.

  In the blade-tip-exchangeable cutting tool configured as described above, the fitting surface 3A is formed in such a state that the cutting insert 2 is attached by the clamp screw 4 with the seating surface 2F contacting the tip surface 1E. Since the fitting member 3 is urged by the urging member 9 to the tip side of the tool body 1 via the plunger 12 and the pressing member 11, the insert mounting seat formed by the fitting surface 3A and the tip surface 1E. It becomes possible to attach the cutting insert 2 to 3B with high rigidity. Even if the forming accuracy of the cutting insert 2 is not so high, the annular or cylindrical insert body 2A is held by the fitting surface 3A of the fitting member 3 biased to the tip side in this manner, and the tool body 1 and Since it can be coaxially aligned, highly accurate and stable cutting can be performed.

  Further, in the cutting edge-exchangeable cutting tool having the above-described configuration, a position facing the concave groove 2I that is a concave portion formed in the seating surface 2F of the cutting insert 2 on the tip surface 1E of the tool body 1 that is the bottom surface of the insert mounting seat 3B. Further, the positioning pin 14 is urged in a direction protruding from the front end surface 1E so as to be able to protrude and retract in the pin mounting hole 1G, and the front end portion 14A of the positioning pin 14 can be accommodated in the concave groove 2I. .

  For this reason, even when the distal end portion 14A contacts the seating surface 2F of the insert body 2A after being placed on the insert mounting seat 3B before the cutting insert 2 is fixed as described above, the positioning is performed as described above in this state. By setting the protrusion height so that the pin 14 is slightly pushed in, the cutting insert 2 placed in this way is rotated in the circumferential direction so that the phase of the positioning pin 14 and the groove 2I coincide. The distal end portion 14A of the positioning pin 14 is accommodated in the concave groove 2I and the cutting insert 2 is positioned.

  Therefore, as in the present embodiment, a plurality of concave grooves 2I are formed at equal intervals in the circumferential direction on the seating surface 2F of the insert main body 2A, and the tip surface 1E of the tool main body 1 is formed of the plurality of concave grooves 2I. Even if the protrusions 1I for restricting rotation are provided so as to be able to be fitted at positions facing at least some of the remaining grooves 2I among the remaining grooves 2I, the protrusions 1I and the remaining grooves 2I Among them, the phase in the circumferential direction of at least a part of the concave grooves 2I can also be matched reliably and easily. For this reason, it is possible to prevent the seating surface 2F of the insert main body 2A other than the groove 2I from riding on the protrusion 1I, and to securely fit the protrusion 1I to the groove 2I. The rotation can be reliably controlled, and damage to the tool body 1 such as breakage of the insert body 2A and crushing of the protrusion 1I can be prevented.

  On the other hand, in the present embodiment, on the tip surface 1E of the tool body 1, the remaining one of the remaining grooves 2I other than the at least a part of the recessed grooves 2I into which the protrusions 1I are fitted. The coolant hole 7 is formed and opened through the accommodation hole 8 so as to face the groove 2I, and the plunger 12 inserted into the tip of the accommodation hole 8 is cylindrical and has a biasing member 9. Are coil springs, both of which are hollow along the axis O. Further, the screw member 13 in which the male screw portion 13A is screwed into the female screw portion 8A at the rear end portion of the accommodation hole 8 is also formed in the accommodation hole 8 with a coolant supply hole 13D formed from the bottom of the engagement hole 13C. Therefore, at the time of cutting, a coolant (fluid) such as cutting fluid, mist, or air is supplied from the machine tool to the coolant hole 7 through the coolant supply hole 13D, the biasing member 9 in the accommodation hole 8, and the hollow portion of the plunger 12. ) Can be supplied.

  In this embodiment, the coolant supplied to the coolant hole 7 in this way is from the remaining remaining groove 2I of the recess 2G on the seating surface 2F side of the insert body 2A communicating with the coolant hole 7. Through the annular groove 2H of the recess 2G, it passes through the space between the mounting hole 2D and the screw shaft portion 4A of the clamp screw 4, and is supplied to the recess 2E on the rake face 2C side. Further, the coolant supplied to the recess 2E is interposed between the protrusion 5B and the recess 2E from the coolant discharge groove 5D formed on the protruding end surface 5C of the protrusion 5B of the washer 5 accommodated in the recess 2E. Then, it is discharged along the rake face 2C from the gap between the rake face 2C of the insert body 2A and the rear end face of the flange portion 5A and supplied to the cutting edge 2B. The cutting part of the work material W by the blade 2B can be cooled and lubricated.

  Therefore, according to such a blade-exchangeable cutting tool of this embodiment, the cutting edge of the cutting insert 2 can be effectively used by effectively utilizing the space of the accommodation hole 8 formed in the tool body 1 that accommodates the biasing member 9. The cutting site of 2B and the work material W can be reliably cooled and lubricated. For this reason, it is possible to prevent a situation in which the rigidity of the tool body 1 is unnecessarily impaired as compared with a case where a coolant supply path is formed separately from the housing hole 8, and the manufacturing cost of the tool body 1 is reduced. Reduction can be achieved.

  In this embodiment, in particular, the cutting insert 2 is a circular piece insert having a circumferential cutting edge 2B, whereas a plurality of coolant discharge grooves 5D are formed radially on the protruding end surface 5C of the washer 5. Therefore, the cutting blade 2B portion actually cut into the work material W and the cutting part of the work material W are separated from the cutting part by the rotational drive of the tool body 1 and become high temperature by cutting. The coolant can also be supplied to the cutting blade 2B portion to cool it. When the coolant discharge groove 5D is formed so as to become wider toward the outer peripheral side as described above, the coolant can be evenly distributed over the entire circumference of the circumferential cutting blade 2B.

  Here, the sum of the minimum cross-sectional areas of the coolant discharge grooves 5D of the washer 5 is preferably greater than or equal to the sum of the cross-sectional areas of the part of the tool body 1 where the cross-sectional area of the coolant supply path is minimum, for example, the part of the coolant hole 7. Is set to be larger than the total sum of the minimum cross-sectional areas, it is possible to prevent the resistance when the coolant is discharged from the coolant discharge groove 5D from being increased and to reduce the pressure loss. Therefore, the coolant supply pressure is not increased more than necessary, and the coolant can be supplied efficiently.

  Moreover, in this embodiment, while the convex part 5B of the washer 5 is accommodated in the recess 2E formed in the rake face 2C of the cutting insert 2, the outer peripheral surface of the convex part 5B and the inner peripheral surface of the recess 2E Between the rake face 2C of the insert body 2A and the rear end face of the flange portion 5A of the washer 5 opposite to the rim face 2C. While the coolant is blown out from between the rake face 2C and the rear end face of the flange portion 5A toward the cutting edge 2B, a turbulent flow is generated in these gap portions. For this reason, the coolant supply to the cutting blade 2B does not become uneven, and cooling and lubrication of the cutting blade 2B and the cutting site can be performed more efficiently.

  On the other hand, in this embodiment, the seating surface 2F of the insert body 2A is formed with a recess 2G on the seating surface 2F side having a plurality of grooves 2I extending radially outward from the mounting hole 2D. The coolant hole 7 that opens in the tip surface 1E of the tool body 1 that forms the insert mounting seat 3B so as to face the seating surface 2F is further toward the tip side so as to communicate with the remaining part of the concave groove 2I. It inclines and extends to the outer peripheral side. For this reason, like the tool main body 1 of this embodiment, the accommodation hole 8 to which the coolant at the rear end of the tool main body 1 is supplied and the screw hole 1F into which the clamp screw 4 at the front end 1A is screwed are centered on the axis O. Even if it is arranged coaxially, the coolant is supplied to the remaining remaining concave groove 2I through the coolant hole 7 inclined as described above, and reliably supplied to the rake face 2C side on which the cutting edge 2B is formed. be able to.

  In the present embodiment, an annular groove 2H is formed between the mounting hole 2D of the insert body 2A and the groove 2I of the recess 2G on the seating surface 2F side so as to go around the opening of the mounting hole 2D. The coolant supplied from the coolant hole 7 to the remaining part of the concave groove 2I is supplied to the rake face 2C via the recess 2G having the annular groove 2H and the concave groove 2I. For this reason, especially when the coolant is a liquid such as a cutting fluid, the recess 2G acts as a liquid pool, so that it is possible to supply the coolant stably even when the coolant supply amount fluctuates. It becomes.

  Further, since the plurality of concave grooves 2I of the recess 2G are formed at equal intervals in the circumferential direction in the present embodiment, when the seating surface 2F of the insert body 2A is seated on the tip surface 1E, Even when the distal end portion 14A of the positioning pin 14 and the protrusion 1I are accommodated in the recessed groove 2I, the coolant hole 7 can be communicated with the remaining remaining recessed groove 2I. Furthermore, in the present embodiment, the coolant supplied to the recess 2G is supplied to the rake face 2C side through a gap portion between the mounting hole 2D of the insert body 2A and the screw shaft portion 4A of the clamp screw 4. Is done. For this reason, in the present embodiment, the insert body 2A can be cooled also from the mounting hole 2D side on the inner periphery, and the insert body 2A can be reliably prevented from becoming hot due to cutting heat, and this cutting heat can be prevented. Is transmitted and the clamp screw 4 is heated to a high temperature to prevent the mounting stability of the cutting insert 2 from being impaired.

  On the other hand, in the cutting edge replacement type cutting tool of the present embodiment, the urging member 9 that urges the fitting member 3 toward the distal end side of the tool body 1 is accommodated in the accommodation hole 8 formed in the rear end portion of the tool body 1. For example, unlike the cutting edge-exchangeable tool described in Patent Document 1, it is not exposed and exposed on the outer periphery of the tool body 1. For this reason, the cutting generated by the cutting blade 2B of the cutting insert 2 at the time of cutting must be interrupted by winding around the urging member 9 that is a coil spring as in this embodiment. It is possible to prevent the urging member 9 from being lost or damaged due to entangled chips, and a stable and smooth cutting operation can be performed.

  Further, in the blade-tip-exchangeable cutting tool in which the biasing member 9 is accommodated in the accommodation hole 8 in the rear end portion of the tool body 1 as described above, for example, a fitting member like the blade-tip-exchangeable cutting tool described in Patent Document 1 is used. The length of the front-end | tip part 1A of the tool main body 1 which the fitting member 3 fits can be shortened with respect to the case where the urging | biasing part is provided in the rear-end part. For this reason, the rigidity of the tool main body 1 and the mounting stability of the cutting insert 2 with respect to the back component force and feed component force at the time of cutting can be improved, and accordingly, high processing accuracy can be obtained.

  Furthermore, in the blade-tip-exchangeable cutting tool of the present embodiment, the annular surface 1D at the rear end of the tip 1A of the tool body 1 into which the fitting member 3 is fitted from the accommodation hole 8 that accommodates the biasing member 9 as described above. A plurality of through holes 10 are formed in the tool body 1 at equal intervals in the circumferential direction, and the fitting member 3 is pushed by the urging member 9 through the pressing members 11 respectively inserted into the through holes 10. Is biased to the side. Therefore, the cylindrical fitting member 3 can be arranged coaxially with the axis O of the tool main body 1 with high accuracy and urged toward the tip side, whereby the annular or cylindrical cutting insert 2 is also connected to the axis O. It can hold | maintain coaxially and can aim at the improvement of the further processing precision, and can also improve attachment stability.

  Furthermore, in the present embodiment, the rear end surface of the head 4B of the clamp screw 4 comes into contact with the reduced diameter portion on the seating surface 2F side of the insert body 2A of the receiving portion 5E of the washer 5 so that the cutting insert 2 is inserted into the insert mounting seat. In the state attached to 3B, the head 4B is buried in the accommodating part 5E so as not to protrude from the front end face of the washer 5. For this reason, even if chips generated by the cutting blade 2B flow out from the rake face 2C of the insert body 2A to the front end face of the flange portion 5A of the washer 5, the head 4B of the clamp screw 4 is not rubbed. It is possible to prevent the head 4B from being worn and damaged by such scraping of chips.

  In addition, in the present embodiment, the washer 5 itself is formed of a material such as maraging steel or cemented carbide having a hardness higher than that of the clamp screw 4 or the tool body 1, so that the wear of the washer 5 due to scraping of the chips is reduced. Damage can also be suppressed. Therefore, according to the present embodiment, it is possible to use the washer 5 and the clamp screw 4 for a long period of time, and by extension, it is possible to extend the life of the cutting edge-exchangeable cutting tool.

  Next, FIGS. 19 to 36 show a second embodiment of the present invention. Elements common to the first embodiment shown in FIGS. 1 to 18 are assigned the same reference numerals. Description is omitted. Here, in the first embodiment described above, the present invention is applied to a drive rotary tool for turning a work material W having a relatively small diameter D, whereas this second embodiment. 36, there is no limitation on the diameter D of the work material W as shown in FIG. 36, and it can be used for turning of the work material W having a relatively small diameter D from a small diameter D. The present invention is applied to.

  That is, in the second embodiment, the diameter of the cutting edge 2B of the annular or cylindrical cutting insert 2 is made larger than the diameter of the shank portion 1B of the tool body 1, and the diameter D is as described above. It is possible to handle turning to a large work material W. Further, the neck portion 1C between the shank portion 1B and the tip portion 1A of the tool body 1 is slightly reduced in diameter at the tip portion of the shank portion 1B, and the outer diameter gradually increases toward the tip side of the tool body 1. After the diameter, the outer diameter becomes constant and reaches the annular surface 1D at the rear end of the front end 1A. Furthermore, the outer diameter of the fitting member 3 is constant, is approximately equal to the diameter of the constant outer diameter portion of the neck 1C, and is approximately equal to or slightly smaller than the diameter of the cutting edge 2B.

  Further, in the present embodiment, the accommodation hole 8 and the screw hole 1F communicate with each other through the communication hole 8C having an inner diameter smaller than the accommodation hole 8 with the axis O as the center, and the coolant hole 7 branches off from the communication hole 8C. The tool body 1 is inclined and extended toward the outer peripheral side as it goes toward the front end side of the tool body 1, and is open to the front end surface 1E. In the second embodiment, as shown in FIG. 29, the coolant discharge groove 5D in the washer 5 is formed so that the groove width becomes wider toward the outer peripheral side, and the coolant discharge groove adjacent in the circumferential direction is formed. The protruding end surface 5C portion remaining between 5D has a constant width.

  Furthermore, the plunger 12 has a plurality of branch holes 12A extending in the radial direction with respect to the axis O from the inner peripheral portion at the tip end portion thereof and opening in the outer peripheral surface of the plunger 12 at equal intervals in the circumferential direction (this embodiment). 4), and the concave groove 12B extends from the opening on the outer peripheral surface of the branch hole 12A to the distal end surface of the plunger 12, so as to avoid the portion of the distal end surface where the rear end surface of the pressing member 11 contacts. The coolant formed on the outer peripheral surface and supplied to the accommodation hole 8 flows from the branch hole 12A through the concave groove 12B into the communication hole 8C. The rear end portion of the pressing member 11 is formed in a truncated cone shape that gradually decreases in diameter toward the rear end side.

  In such a blade-exchangeable cutting tool of the second embodiment, the positioning pin 14 is located at the position facing the seating surface 2F of the cutting insert 2 on the tip surface 1E of the tool body 1 as in the first embodiment. Even when the distal end portion 14A of the positioning pin 14 abuts on the seating surface 2F other than the groove 2I when the cutting insert 2 is placed on the insert mounting seat 3B, the cutting insert 2 is moved around. By rotating in the direction, the cutting insert 2 can be positioned by accommodating the tip portion 14A in the concave groove 2I. Therefore, the seating surface 2F other than the groove 2I is prevented from riding on the protrusion 1I, the protrusion 1I is securely fitted in the groove 2I, and the rotation of the cutting insert 2 is restricted, and the insert body 2A and the tool body 1 can be prevented from being damaged.

  Furthermore, in this embodiment, since the screw hole 1F into which the clamp screw 4 is screwed is communicated with the accommodation hole 8 via the communication hole 8C, the clamp screw 4 is screwed to the screw shaft by the coolant supplied to the accommodation hole 8. It can cool also from the edge part of the part 4A. For this reason, expansion of the clamp screw 4 due to cutting heat can be prevented more reliably, and the cutting insert 2 can be attached more stably.

  In the second embodiment and the first embodiment, the concave portion of the cutting insert 2 is formed as a concave groove 2I that opens to the inner circumferential annular groove 2H and extends to the outer circumferential side. When the coolant is not supplied as in the embodiment, it may be a simple concave hole that does not open other than the seating surface 2F. In this case, since the coolant hole 7 is not provided, the protrusion 1I may also be provided at a position facing the remaining remaining concave groove 2I (concave hole).

  In the first and second embodiments, a coil spring is used as the urging member 9 having a hollow portion that allows the coolant to be supplied in the accommodation hole 8. The fitting member 3 may be urged via the pressing member 11 or the plunger 12 by alternately accommodating the large diameter portion and the small diameter portion in the accommodation hole 8. Further, in the first and second embodiments, an annular circular piece insert is detachably attached to the insert mounting seat 3B as the cutting insert 2, but for example, an end mill having a cutting edge formed on the tip surface or the outer peripheral surface. A cylindrical cutting insert for use may be attached to form a blade-tip exchange type end mill.

DESCRIPTION OF SYMBOLS 1 Tool main body 1A The front-end | tip part of the tool main body 1 1B Shank part (rear end part of the tool main body 1)
1E Tip surface of the tool body 1 (bottom surface of the insert mounting seat 3B)
1F Screw hole 1G Pin mounting hole 1I Protrusion 2 Cutting insert 2A Insert body 2B Cutting blade 2C Rake face 2D Mounting hole (Inner circumference of insert body 2A)
2F Seating surface 2I Concave groove (concave part of insert body 2A)
DESCRIPTION OF SYMBOLS 3 Fitting member 3A Fitting surface 3B Insert mounting seat 4 Clamp screw 5 Washer 7 Coolant hole 8 Accommodating hole 9 Energizing member 10 Through hole 11 Pressing member 12 Plunger 13 Screw member 14 Positioning pin 14A End portion 15 of positioning pin 14 Pin urging member 16 Metal ball O Axis of tool body 1 W Work material

Claims (3)

A cutting insert having an annular or cylindrical insert body and a cutting edge formed on the outer periphery of the insert mounting seat formed at the tip of the tool body has a seating surface facing the rear end side of the insert body. The clamp screw inserted into the inner peripheral part of the insert body in contact with the bottom surface of the insert mounting seat is removably attached by being screwed into the screw hole formed in the bottom surface,
On the seating surface of the insert body, a recess is formed with an interval from the inner periphery of the insert body to the outer periphery,
On the bottom surface of the insert mounting seat, a positioning pin having a tip portion that can be accommodated in the concave portion at a position facing the concave portion on the outer peripheral side of the screw hole is urged and projected in a direction protruding from the bottom surface. A cutting edge exchangeable cutting tool characterized by being provided. On the seating surface of the insert body, a plurality of the recesses are formed at equal intervals in the circumferential direction,
On the bottom surface of the insert mounting seat, the positioning pins are provided at positions facing some of the plurality of recesses,
At the position facing at least some of the remaining recesses, a protrusion having a lower protrusion height from the bottom surface than the positioning pin in the protruding state is formed on at least some of the remaining recesses. The cutting edge exchangeable cutting tool according to claim 1, wherein the cutting tool is provided so as to be fitted. On the seating surface of the insert body, a plurality of the recesses are formed at equal intervals in the circumferential direction,
On the bottom surface of the insert mounting seat, the positioning pins are provided at positions facing some of the plurality of recesses,
The blade tip exchange type according to claim 1 or 2, wherein a coolant hole for supplying a coolant to the cutting insert is formed at a position facing at least a part of the remaining recesses. Cutting tools.

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