JP2008000829A - Insertable detachable spherical cutter - Google Patents

Abstract

[PROBLEMS] To easily adjust the position of a cutting edge of an insert detachably mounted on a mounting seat so that the position of the cutting edge can be accurately placed on a spherical surface centered on one point on the axis of a tool body. An insert detachable spherical cutter capable of forming a spherical counterbore with high dimensional accuracy is provided.
A tool body 11 that is rotated about an axis O in a tool rotation direction T is provided on a mounting seat 24 formed on an end surface 15 of the tool body 11 facing the axis O direction. An insert 50 having a blade 53 is detachably mounted so that an arc formed by the cutting blade 53 is positioned on a spherical surface having a center P on the axis O, and the tool body 11 has the cutting blade 53. A first adjustment mechanism 33 that adjusts the radial position of the tool body 11 and a second adjustment mechanism that adjusts the position of the cutting edge 53 in another direction that intersects the radial direction of the tool body 11 when viewed from the front side of the tool rotation direction T. 37 is provided.
[Selection] Figure 1

Description

  The present invention relates to an insert detachable spherical cutter used when a spherical counterbore part is formed on a workpiece.

Conventionally, as a spherical cutter for forming a spherical counterbore on the inner surface of a cavity formed in a workpiece, for example, those shown in FIGS. 8 and 9 are widely provided.
The spherical cutter shown in FIGS. 8 and 9 has a tool body 1 having a substantially cylindrical shape extending along the axis O, and the center portion of the tool body 1 in the direction of the axis O is recessed radially inward. ing. Both end faces 2 and 2 of the tool body 1 are formed in a convex curved shape, and three recesses 3 are arranged on the both end faces 2 and 2 with a gap in the circumferential direction. A cutting edge tip 4 having an arcuate cutting edge 5 is brazed to the wall surface of the recess 3 facing the front side in the tool rotation direction T with the cutting edge 5 protruding from the end face 2. .

Here, these cutting edges 5 have the center P on the axis O of the tool body 1 at each end face 2 by polishing each end face 2 with the cutting edge tip 4 brazed. It is formed so as to be positioned on a spherical surface R having a slightly larger radius than the end surface 2.
Further, the tool body 1 is formed with mounting holes 6 extending along the axis O so as to open to both end faces 2, 2. It is formed in a square shape centered on O. Therefore, the mounting hole 6 is disposed inside the tool body 1 in the radial direction of the cutting edge tip 4.

  Such a spherical cutter is accommodated in a cavity formed in the workpiece, and a pair of machine tools from the outside through a pair of insertion holes formed coaxially in the workpiece so as to communicate with the cavity. Each arbor is inserted, and the tips of these arbors are rotated around the axis O through the arbor by attaching them to the mounting holes 6 from both sides in the direction of the axis O. Then, by rotating the tool main body 1 and feeding the arbor so as to reciprocate integrally with the tool main body 1 on both sides in the axis O direction, around the insertion hole on the inner surface of the cavity portion, A concave counterbore portion having a center P on the axis O is formed by the cutting edge 5 of the cutting edge tip 4 brazed to the end face 2 of the tool body 1 facing each insertion hole. Here, by adjusting the feed amount by the arbor, by matching the center of the concave spherical surface formed by the counterbore portion formed on the inner surface of the hollow portion, the counterbore portion that is concavely curved along one spherical surface is formed. It can be formed at both ends of the inner surface.

In the spherical cutter having this configuration, the cutting edge tip 4 is brazed to the tool body 1, so that when the cutting edge 5 is worn, the cutting edge 5 is re-polished like a normal brazing tool. . If the cutting edge 5 is repolished while the diameter of the arc formed by the cutting edge 5 is kept constant, the center P point of the arc is shifted outward in the axis O direction. Therefore, the spherical cutter obtained by repolishing the cutting edge 5 is used. In this case, it is necessary to change the feed amount in the axis O direction. Therefore, there is a possibility that the spherical counterbore cannot be formed with high accuracy due to a feed amount setting error, a measurement error of the cutting edge position, or the like.
In addition, since the tool body 1 and the cutting blade 5 are integrally formed by brazing, when the material of the cutting blade is to be changed depending on the material to be cut, the spherical cutter itself must be replaced. It is necessary to prepare many spherical cutters according to the cutting material, and the use cost of the spherical cutters increases.

Therefore, for example, as shown in Patent Documents 1 and 2, there is provided an insert detachable spherical cutter in which a mounting seat is formed on the end surface of the tool body, and an insert having a cutting blade is detachably mounted on the mounting seat. Yes.
In such a spherical cutter, even if the cutting blade is worn, the insert can be replaced and used. Therefore, the center P point of the arc formed by the cutting blade can be made constant, and the feed amount needs to be adjusted for each spherical cutter. There is no. Furthermore, when the material of the cutting blade is to be changed depending on the material to be cut, it can be dealt with by simply replacing the insert, so that it is not necessary to prepare many tool bodies, and the cost of using the spherical cutter can be greatly reduced.
JP 2006-62003 A JP 2000-343316 A

  By the way, in the spherical cutter described in Patent Document 1, the insert is seated on the mounting seat of the tool body and pressed and fixed by the clamp member, and the position of the insert is the front side in the tool rotation direction of the mounting seat. It is set as the structure determined by the wall surface (sitting surface) which faces, the wall surface which faces a tool main body radial direction outer side, and the wall surface (restraint surface) which faces an axial direction outer side. Therefore, the position of the cutting edge varies depending on the dimensional error of the mounting seat and the shape of the insert, and the cutting edge of the insert arranged on the end face of the tool body is on a spherical surface centered on one point on the axis of the tool body. It was difficult to accurately position them. For this reason, the spherical spot facing portion cannot be formed with high dimensional accuracy.

  In addition, in order to stabilize the position of the cutting blade, it is necessary to strictly manage the dimensional accuracy of the tool body (mounting seat) and the shape of the insert, and to manufacture and manage them. The management cost has risen significantly, and there has been a problem that the use cost of the spherical cutter cannot be reduced despite the fact that the insert is detachable.

  In the spherical cutter described in Patent Document 2, the tool body is provided with a position adjusting mechanism, and the position of the cutting blade can be adjusted when the cutting blade is worn and the insert is replaced. However, in this spherical cutter, since the adjustment direction of the insert is only one direction, in order to arrange the position of the cutting edge of the insert arranged on the end face on the spherical surface around the point P, there are many Time and effort.

  The present invention has been made in view of the above-described circumstances, and easily adjusts the position of the insert detachably mounted on the mounting seat so that the cutting edge is centered on one point on the axis of the tool body. It is an object of the present invention to provide an insert detachable spherical cutter that can be arranged on a spherical surface with high accuracy and can form a spherical counterbore portion with high dimensional accuracy.

  In order to solve this problem, an insert detachable spherical cutter according to the present invention has a tool body that is rotated about an axis in a tool rotation direction, and is formed on an end surface of the tool body that faces the axis direction. An insert having an arcuate cutting edge is detachably mounted on the mounting seat so that the arc formed by the cutting edge is located on a spherical surface having a center on the axis. The first adjusting mechanism for adjusting the tool body radial position of the cutting blade and the position of the cutting blade in another direction intersecting the tool body radial direction when viewed from the front side in the tool rotation direction. The second adjustment mechanism is provided.

  In the insert detachable spherical cutter having this configuration, the first adjusting mechanism for adjusting the cutting blade position in the tool main body radial direction and the cutting blade in the other direction intersecting the tool main body radial direction when viewed from the front side in the tool rotation direction. The second adjustment mechanism that adjusts the position of the cutting blade makes it possible to adjust the position of the cutting blade in two directions, making it easy and accurate to adjust the position of the cutting blade to place the cutting blade in the tool body. It can arrange | position on the spherical surface centering on one point on this axis line.

  Therefore, when wear occurs on the cutting edge, it is possible to replace only the insert and use it, and even if the insert is replaced, the position of the cutting edge can be adjusted easily and accurately on the axis of the tool body. It can be positioned on a spherical surface centered on one point, and a spherical counterbore portion having a predetermined diameter can be formed with high accuracy on the inner surface of the cavity portion of the workpiece.

Here, a first accommodation hole extending in a direction intersecting with the tool body radial direction when viewed from the axial direction is bored inside the tool body in the radial direction of the mounting seat, and the first accommodation hole is provided with the first accommodation hole. As an adjustment mechanism, a first pressing pin having a pressing surface that presses a side surface of the insert facing the inner side in the radial direction of the tool body at the tip, and a first adjusting screw that presses and moves the first pressing pin. By accommodating, the position of the cutting blade in the radial direction of the tool body can be adjusted with the first adjusting screw.
Further, since the first accommodation hole is formed in a direction extending in a direction intersecting with the tool main body radial direction when viewed from the axial direction, the diameter of the mounting seat is small even when the space in the tool main body radial inner portion is small. The 1st adjustment mechanism which presses an insert toward a direction can be provided.

  According to the present invention, the position of the cutting edge of the insert that is detachably attached to the mounting seat is easily adjusted, and the position of the cutting edge is accurately placed on a spherical surface centered on one point on the axis of the tool body. Thus, it is possible to provide an insert-detachable spherical cutter capable of forming a spherical counterbore portion with high dimensional accuracy.

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 6 show an insert detachable spherical cutter which is an embodiment of the present invention.
The insert detachable spherical cutter 10 has a tool body 11 having a substantially cylindrical shape extending along the axis O. At the center of the tool body 11 in the direction of the axis O, a groove 12 that is recessed one step radially inward is formed over the entire circumference of the tool body 11, and a pair of grooves extending in parallel with the axis O is formed in the groove 12. The flat surfaces 13, 13 are arranged in parallel to each other. Here, in the present embodiment, the tool main body 11 is formed so as to be symmetric with respect to the virtual plane Q that is orthogonal to the axis O and is located in the center of the axis O direction.

Both end portions 14 and 14 of the tool body 11 sandwiching the recessed groove 12 are formed in a convex curved shape having end surfaces 15 and 15 each having a center P (P ′) on the axis O, and both end portions thereof. A pair of flat portions 16, 16 parallel to the flat surface 13 are also formed on the outer peripheral surfaces 14, 14.
The center P of the spherical surface formed by the end surface 15 facing one side (right side in FIG. 1) is located on the other side (left side in FIG. 1) of the virtual plane Q and the spherical surface formed by the end surface 15 facing the other side. The center P ′ is located on one side of the virtual plane Q, and the length of the tool body 11 in the direction of the axis O is set to be smaller than the diameter of the spherical surface formed by each end face 15.

  The both end portions 14 and 14 are formed with attachment holes 17 extending along the axis O so as to open toward the respective end surfaces 15 and 15. The mounting hole 17 is formed with a tapered hole 18 that gradually decreases in diameter about the axis O as it goes inward in the direction of the axis O in the opening portion on the end face 15 side, A large-diameter hole 19 having a one-step large diameter is formed along the virtual plane Q, and square holes 20 having a square cross section are formed on both sides of the large-diameter hole 19. Further, the opening edge of the mounting hole 17 in the end surface 15, that is, the intersection ridge line portion between the end surface 15 having a spherical shape and the tapered hole portion 18 of the mounting hole 17 is annularly formed by chamfering perpendicularly to the axis O. A flat portion 21 is formed.

  In addition, a pair of concave portions 22 and 22 that open toward the end surface 15 are formed at both end portions 14 and 14 so as to be 180 ° rotationally symmetric about the axis O. As shown in FIG. 1 when viewed from the front side of the tool rotation direction T, the recess 22 has a substantially L-shape with a wall surface 22a facing outward in the axis O direction and a wall surface 22b facing outward in the radial direction of the tool body 11, and the axis line As shown in FIGS. 2 and 3 when viewed from the O direction, the wall surface 22b facing the tool body 11 radially outward and the wall surface 22c facing the front side in the tool rotation direction T form a substantially L shape.

  A wall surface 22 a facing the outside in the axis O direction of the recess 22 is formed to extend in a direction orthogonal to the axis O, and a wall surface 22 b facing the outside in the radial direction of the tool body 11 of the recess 22 is formed to extend in parallel to the axis O. These wall surfaces 22a and 22b are connected via a concave curved surface. Further, as shown in FIGS. 2 and 3, a coolant supply hole 23 communicating with the large-diameter hole 19 of the mounting hole 17 is opened in the wall surface 22 a facing the outside in the axis O direction of the recess 22.

  A mounting seat 24 for mounting an insert 50 to be described later is formed on the wall surface 22c of the recess 22 facing the front side in the tool rotation direction T. The mounting seat 24 is recessed by one step from the wall surface 22c facing the front side in the tool rotation direction T of the recess 22 toward the rear side in the tool rotation direction T, and is opened toward the outer side in the radial direction of the tool body 11 and the outer side in the axis O direction. Yes. In the present embodiment, as shown in FIGS. 2 and 3, the wall surface 24 b facing the tool body 11 in the radial direction of the mounting seat 24 and the wall surface 22 b facing the tool body 11 in the radial direction of the recess 22 are formed in the mounting hole 17. It is formed so as to intersect with the annular flat surface portion 21 formed at the opening edge.

  Here, as shown in FIG. 4, a clamp screw hole 25 extending perpendicular to the wall surface 24 c is formed in the wall surface 24 c facing the tool rotation direction T front side of the mounting seat 24. Further, as shown in FIG. 1, the wall surface 24 a facing the outer side of the mounting seat 24 in the axis O direction is positioned on the outer side in the axis O direction than the wall surface 22 a facing the outer side of the recess 22 in the axis O direction. As it goes outward in the direction, it is inclined so as to recede toward the inner side in the direction of the axis O gradually. A wall surface 24 b of the mounting seat 24 facing the tool body 11 in the radial direction is formed to extend in parallel with the axis O.

  And as shown in FIG.1 and FIG.3, as shown in FIG.1 and FIG.3, the tool main body 11 radial direction inner side of this attachment seat 24 is 1st extended in the direction which cross | intersects with the wall surface 24c which faces the tool rotation direction T front side. A receiving hole 30 is formed. In the present embodiment, the first receiving hole 30 extends in a direction orthogonal to the wall surface 24 c facing the tool rotation direction T front side of the mounting seat 24, and the wall surface facing the tool rotation direction T front side of the mounting seat 24. It is drilled so as to penetrate from 24 c to the outer peripheral surface of the tool body 11, and is arranged outside the center of the clamp screw hole 25 in the axis O direction.

  A first pressing pin 31 is disposed on the first seating hole 30 on the mounting seat 24 side, and a first adjustment screw 32 is screwed on the rear end side of the first pressing pin 31, and a wrench or the like. The rear end surface 15 of the first adjustment screw 32 in which the engagement hole with which the working tool is engaged is formed is exposed toward the outer peripheral side of the tool body 11. An inclined plane that is inclined with respect to the axis of the first pressing pin 31 is formed at the tip of the first pressing pin 31, and this inclined plane serves as a first pressing surface 31a that comes into contact with an insert 50 described later. ing. The first pressing pin 31 and the first adjustment screw 32 are the first adjustment mechanism 33 in the present embodiment.

  Further, as shown in FIGS. 1 and 2, two second housings extending in a direction intersecting with the wall surface 24 c facing the front side in the tool rotation direction T of the mounting seat 24 are provided on the inner side in the axis O direction of the mounting seat 24. The holes 34 are formed so that they are arranged in parallel. In the present embodiment, these second receiving holes 34, 34 extend in a direction orthogonal to the wall surface 24 c facing the tool rotation direction T front side of the mounting seat 24, and the tool rotation direction T front side of the mounting seat 24 A hole is formed so as to penetrate from the facing wall surface 24 c to the outer peripheral surface of the tool body 11.

  One of these two second receiving holes 34, 34 is disposed in the vicinity of the wall surface 24 b facing the tool body 11 radially outward of the mounting seat 24, and the other is disposed in the tool body 11 radially outer portion of the mounting seat 24. The clamp screw hole 25 is positioned between the two second accommodation holes 34 in the radial direction of the tool body 11. These two second accommodation holes 34 and 34 and the clamp screw hole 25 have the largest distance between the two second accommodation holes 34 and 34 when viewed from the front side in the tool rotation direction T, and are located on the radially inner side. The second receiving hole 34 and the clamp screw hole 25 are arranged so as to form an unequal triangular shape having the smallest distance.

As shown in FIGS. 2 and 5, the second receiving hole 34 is provided with a second pressing pin 35 on the mounting seat 24 side, and a second adjustment screw 36 at the rear end of the second pressing pin 35. Are screwed, and the rear end surface of the second adjustment screw 36 in which an engagement hole with which a work tool such as a wrench is engaged is formed is exposed toward the outer peripheral side of the tool body 11. An inclined plane inclined with respect to the axis of the second pressing pin 35 is formed at the tip of the second pressing pin 35, and this inclined plane serves as a second pressing surface 35a that comes into contact with an insert 50 described later. ing. The second pressing pin 35 and the second adjusting screw 36 are the second adjusting mechanism 37 in the present embodiment.
Therefore, the tool body 11 includes a first adjustment mechanism 33 that adjusts the position of the insert 50 in one direction (the tool body 11 radial direction) that intersects each other when viewed from the front side of the tool rotation direction T and the other direction. 2 adjustment mechanism 37 is provided.

  Further, as shown in FIG. 6, fitting holes 40 extending in parallel to the axis O and opened at the outer peripheral end portion of the annular flat surface portion 21 are formed in both end faces 15, 15 of the tool body 11. Yes. A fixing screw hole 41 communicating with the insertion hole 40 and extending in a direction perpendicular to the insertion hole 40 is formed in the center portion of the insertion hole 40 in the axis O direction. Further, a positioning screw hole 42 communicating with the insertion hole 40 and extending in a direction orthogonal to the insertion hole 40 is formed in the inner portion of the insertion hole 40 in the axis O direction. In the present embodiment, the fixing screw hole 41 and the positioning screw hole 42 are arranged in parallel with each other and in parallel with the first accommodation hole 34. A fixing screw 43 having a substantially cylindrical shape is screwed into the fixing screw hole 41, and the front end surface of the fixing screw 43 has a planar shape extending perpendicular to the axis of the cylinder formed by the fixing screw 43. Is formed. On the other hand, a positioning screw 44 having a tapered tip is screwed into the positioning screw hole 42.

  A chamfering tip 45 made of a hard material such as cemented carbide and having an outer shape that is substantially cylindrical is inserted into the insertion hole 40. The tip of the chamfered tip 45 has a cross section perpendicular to the central axis of the cylinder formed by the chamfered tip 45 cut into a semicircular shape so that the cutout surface 46 is a rake face, and the side facing the cutout surface 46. When viewed from above, the leading edge is cut out so as to intersect the central axis at approximately 45 °, and a chamfered cutting edge 47 is formed at the leading edge.

  Further, a rear end portion of the chamfered tip 45 extends in a direction orthogonal to the cutout surface 46 and is opposite to the chamfered cutting blade 47 when viewed from a direction facing the cutout surface 46 with respect to the central axis. An inclined surface portion 48 that inclines is formed, and a flat surface portion 49 that extends in a direction orthogonal to the notch surface 46 and is parallel to the central axis is formed on the outer peripheral surface of the chamfered tip 45. The chamfered cutting edge 47 and the inclined surface portion 48 are formed on the sides approaching each other.

  Such a chamfering tip 45 is inserted into the fitting hole 40 with the chamfering cutting edge 47 facing outward in the axis O direction, and the flat surface portion 49 is arranged so as to face the side where the fixing screw hole 41 is opened. Here, the taper angle at the tip of the positioning screw 44 is the same as the inclination angle of the inclined surface portion 48 formed at the rear end portion of the chamfered chip 45, and the chamfered chip 45 is screwed by screwing the positioning screw 44. Can be moved outward in the direction of the axis O. The chamfer tip 45 is fixed by screwing the fixing screw 43 after adjusting the position in the direction of the axis O, so that the tip of the fixing screw 43 presses the flat surface portion 49 inward in the radial direction of the tool body 11.

  Next, the insert 50 that is detachably mounted on the mounting seat 24 will be described. This insert 50 is made of a hard material such as cemented carbide and has an outer shape of a substantially rectangular flat plate. In this embodiment, as shown in FIGS. 1 to 5, two inserts arranged substantially parallel to each other are formed. It has a substantially square quadrilateral flat plate shape having a short side and two long sides, and has two parallelogram surfaces 51 and four side surfaces 52, and one parallelogram surface 51 is provided on the mounting seat 24. The mounting surface 51a is placed on the wall surface 24c facing the front side of the tool rotation direction T, and the other parallelogram surface 51 is directed to the front side of the tool rotation direction T to form a rake face 51b.

  One long side of the parallelogram surface 51, which is the rake face 51b, has a convex arc shape that is convex outward, and this long side portion is an arc-shaped cutting blade 53. A side surface 52 connected to the arcuate cutting edge 53 is a flank 52a, which forms a convex curved surface that protrudes outward, and is inclined so as to recede toward the inside of the insert 50 as it approaches the mounting surface 51a. It has been.

As shown in FIG. 3, the side surface 52 connected to the long side provided with the arcuate cutting edge 53 and the short side intersecting with an acute angle gradually retreats to the inside of the insert 50 as it approaches the mounting surface 51a. An inclined plane is formed, and this inclined plane is the first pressed surface 54.
Further, on the side surface 52 arranged opposite to the side surface 52 which is the flank 52a, that is, the side surface 52 connected to the other long side of the parallelogram surface 51, as shown in FIGS. An inclined plane is formed so as to gradually recede to the inner side of the insert 50 as it approaches 51 a, and this inclined plane is the second pressed surface 55.
Further, an insertion hole 56 penetrating in the thickness direction of the insert 50 is formed in the center portion of the parallelogram surface 51. The rake face 51b side portion of the insertion hole 56 is formed in a tapered surface shape that gradually increases in diameter toward the rake face 51b side.

Such an insert 50 is attached to the mounting seat 24 as follows. The insert 50 is mounted such that the mounting surface 51a of the insert 50 abuts on the wall surface 24c facing the tool rotation direction T front side of the mounting seat 24. Here, the first pressed surface 54 of the insert 50 is disposed so as to face the wall surface 24b facing the radially outer side of the tool body 11 of the mounting seat 24, and the second pressed surface 55 is in the direction of the axis O of the mounting seat 24. Opposing to the wall surface 24a facing outward. Then, the arcuate cutting edge 53 is arranged so as to face the outside in the direction of the axis O.
Further, in the state where the insert 50 is placed in this way, the center of the clamp screw hole 25 is on the inner side in the axis O direction and the diameter of the tool body 11 with respect to the center of the insertion hole 56 when viewed from the front side in the tool rotation direction T. It is slightly eccentric toward the inside in the direction.

The first pressed surface 54 of the insert 50 is in contact with the first pressing surface 31a of the first pressing pin 31 disposed in the first receiving hole 30, as shown in FIG. As shown in FIG. 5, the second pressed surface 35 a of the second pressing pin 35 disposed in the second accommodation hole 34 is in contact with the 50 second pressed surface 55.
Here, the insert 50 is fixed to the mounting seat 24 by inserting a clamp screw 57 having a head through the insertion hole 56 and screwing it into the clamp screw hole 25. Here, as described above, the center of the clamp screw hole 25 is slightly decentered from the center of the insertion hole 56 toward the inside of the axis O direction and the inside of the tool body 11 in the radial direction. The main body 11 is fixed so as to be pulled inwardly in the radial direction and inward in the axis O direction, that is, pressed against the wall surface 24 a facing the outer side in the axis O direction of the mounting seat 24 and the wall surface 24 b facing outward in the radial direction of the tool body 11. Will be.

  Further, the respective inserts 50, 50 mounted on the two mounting seats 24, 24 formed on the end surface 15 facing the same side are positioned on a virtual plane S in which the rake face 51b of each other insert 50 passes through the axis O. And the rotation locus around the axis O of the arcuate cutting edge 53 formed in these inserts 50 has a larger step radius than the end face 15 around the center P (P ′). It is arranged so as to form one spherical surface R (R ′).

  In the insert detachable spherical cutter 10 configured as described above, when the first adjustment screw 32 is screwed, the first pressing pin 31 moves toward the mounting seat 24 and the first pressing surface 31 a is the first of the insert 50. The surface pressing 54 is pressed outward in the radial direction of the tool body 11 perpendicular to the axis O, the insert 50 moves outward in the radial direction of the tool body 11, and the radial position of the arcuate cutting blade 53 in the radial direction of the tool body 11. Adjusted. Further, when the second adjustment screw 36 is screwed in, the second pressing pin 35 moves toward the mounting seat 24, the second pressing surface 35 a presses the second pressed surface 55 of the insert 50, and the insert 50 is axial. The position of the arcuate cutting edge 53 is adjusted by moving toward the outer side in the O direction and the outer side in the radial direction of the tool body 11.

  In the present embodiment, the first adjustment mechanism 33 constituted by the first adjustment screw 32 and the first pressing pin 31 adjusts the radial position of the arcuate cutting blade 53 in the tool body 11. The first accommodation hole 30 that accommodates the first adjusting screw 32 and the first pressing pin 31 is drilled so as to be orthogonal to the adjustment direction (the tool body 11 radial direction) of the arcuate cutting edge 53 when viewed from the axis O direction. It is installed.

  In this insert detachable spherical cutter 10, the position of the arcuate cutting blade 53 is adjusted as described above, and the arcuate cutting blades 53 of the two inserts 50, 50 mounted on the mounting seat 24 on the same end surface 15 side. , 53 are adjusted so as to coincide with each other in the rotation locus about the axis O, that is, on the spherical surface R (R ′) centered on the center P (P ′). , And subjected to the cutting shown in FIG.

  The insert detachable spherical cutter 10 is housed in a cavity C formed in the workpiece W, and passes through a pair of insertion holes H, H formed coaxially in the workpiece W so as to be inserted into the cavity C. A pair of arbors A and A of a machine (not shown) are inserted, and the tips of these arbors A and A are supported by attaching them to the attachment holes 17 from the outside in the axis O direction. Here, the front end of the arbor A is formed with a drive section D having a square cross section that fits into the square hole 20 of the mounting hole 17, and is equal to the tapered hole 18 on the rear end side. A taper portion E that is reduced in diameter toward the tip side at a taper angle is formed, and the axis O of the tool body 11 is changed to a rotation axis by the arbors A and A by closely contacting the taper portion E and the taper hole portion 18. At the same time, the tool body 11 is rotated together with the arbors A and A in the tool rotation direction T by fitting the square hole portion 20 and the drive portion D together.

  Inserting the inner periphery of the cavity C of the workpiece W by rotating the tool body 11 around the axis O and feeding it so as to reciprocate in both directions in the direction of the axis O by the arbors A and A. A spherical surface R (having a center P (P ′) on the axis O by an arcuate cutting edge 53 of the insert 50 mounted on the mounting seat 24 of the end face 15 facing the insertion hole H side around the holes H, H. R ') and concave spherical counterbore portions F, F having the same diameter as that of R') are formed, and at the same time, the cutting edge of the chamfered tip 45 is formed at the intersection ridgeline portion between the counterbore portion F and the insertion hole H. Chamfer.

  Furthermore, the amount of reciprocation of the tool body 11 by the arbor A, A is determined by the rotation locus of the arcuate cutting edge 53 of the insert 50 mounted on the mounting seat 24 of each end face 15 forming each counterbore F. By setting the positions of the centers P (P ′) of the spherical surface R (R ′) to coincide with each other, the concave spherical surface formed by these counterbore portions F and F formed at both ends of the cavity C It can be a concave spherical surface along one spherical surface R.

  According to the insert detachable spherical cutter 10 having this configuration, the first pressing pin that adjusts the radial position of the arcuate cutting blade 53 by pressing the insert 50 toward the tool body 11 radially outward. 31 and the first adjusting screw 32 (first adjusting mechanism 33), the second pressing pin 35 and the second adjusting screw that press the insert 50 in a direction intersecting the radial direction when viewed from the front side of the tool rotation direction T. 36 (second adjusting mechanism 37) is provided, the position of the arcuate cutting edge 53 can be adjusted by moving it in two directions, and the position of the arcuate cutting edge 53 can be easily adjusted. And it can be performed with high accuracy.

  Therefore, even when the arcuate cutting edge 53 is worn due to use and the insert 50 is replaced, the position of the arcuate cutting edge 53 is adjusted easily and accurately to make a spherical surface centered on one point on the axis of the tool body 11. The spherical counterbore F having a predetermined diameter can be accurately formed on the inner surface of the cavity C of the workpiece W.

  Further, the center of the clamp screw hole 25 drilled in the mounting seat 24 is slightly eccentric to the inside of the tool body 11 in the radial direction and the inside of the axis O direction with respect to the insertion hole 56 of the insert 50 placed on the mounting seat 24. Thus, the insert 50 is fixed by the clamp screw 57 so as to be drawn inwardly in the radial direction of the tool body 11 and inward of the axis O direction, and is fixed by the first pressing pin 31 and the second pressing pin 35. In a state where the insert 50 is not pressed, the arcuate cutting edge 53 is positioned inside the tool body 11 in the radial direction and inside the axis O direction. Therefore, by adjusting the screwing amounts of the first adjustment screw 32 and the second adjustment screw 36, the position of the arcuate cutting blade 53 can be adjusted so as to be able to advance and retreat in the adjustment direction. It becomes even easier.

  Further, in the present embodiment, the first accommodation hole 30 is orthogonal to the wall surface 24c facing the tool rotation direction T front side of the mounting seat 24 so as to be orthogonal to the radial direction of the tool body 11 when viewed from the axis O direction. Since the first pressing pin 31 and the first adjustment screw 32 are accommodated in the first accommodation hole 30, the inner portion of the tool seat 11 in the radial direction of the mounting seat 24 as in this embodiment. Even when the mounting hole 17 is formed and the space is small, the radial position of the arcuate cutting blade 53 in the tool body 11 can be adjusted.

  In the present embodiment, one of the two second accommodation holes 34, 34 is disposed in the vicinity of the wall surface 24 b facing the radially outer side of the mounting seat 24, and the other is disposed in the radially outer portion of the mounting seat 24. In addition, since the clamp screw 57 is positioned between the two second accommodation holes 34 in the radial direction of the tool body 11, the second accommodation holes 34 and 34 accommodated in the two second accommodation holes 34 and 34. Even if the insert 50 is slightly rotated around the clamp screw 57 by adjusting the pressing force by the second pressing pin 35 by adjusting the screwing amount of the adjusting screw 36 independently, the arc-shaped cutting blade 53 Position adjustment can be performed.

  Furthermore, in this embodiment, since the position of the arcuate cutting edge 53 can be adjusted with high accuracy by pressing the insert 50, the dimensional accuracy of the mounting seat 24 and the shape of the insert 50 can be strictly controlled to manufacture. Therefore, it is possible to prevent the manufacturing cost and the management cost of the mounting seat 24 and the insert 50 from being increased, and the use cost of the spherical cutter 10 can be greatly reduced.

Although the insert detachable spherical cutter as an embodiment of the present invention has been described above, the present invention is not limited to this and can be appropriately changed without departing from the technical idea of the present invention.
For example, although it has been described that two mounting seats are formed on the end surface, one mounting seat may be formed, or three or more mounting seats may be formed. Is preferably set appropriately in consideration of the workpiece material, cutting conditions, and the like.
Moreover, although the shape of the insert has been described as a parallelogram flat plate, the shape of the insert is not limited, and any shape can be used as long as the arcuate cutting edge can be disposed outward in the axis O direction.

Furthermore, although it has been described that the engagement holes of the first and second adjustment screws are exposed toward the rear side in the tool rotation direction of the mounting seat, the present invention is not limited to this, and the front of the mounting seat in the tool rotation direction is not limited thereto. It may be exposed to the side.
In addition, the first and second adjustment mechanisms have been described as including the first and second pressing pins and the first and second adjusting screws, but the present invention is not limited to this, and the insert is pressed by the wedge member. Then, it is possible to adjust the position of the arcuate cutting edge.
Further, although the description has been given with the case where the square hole portion is formed in the mounting hole of the tool main body, the present invention is not limited to this, and a torque transmission portion that rotates the tool main body by engaging the tool main body and the arbor is formed. Just do it.

It is a side view of an insert detachable spherical cutter which is an embodiment of the present invention. It is an A direction arrow directional view in FIG. It is a B direction arrow directional view in FIG. It is XX sectional drawing in FIG. It is YY sectional drawing in FIG. It is ZZ sectional drawing in FIG. It is explanatory drawing which shows the state which cuts a workpiece | work with the insert detachable spherical cutter shown in FIG. It is a side view of the conventional spherical cutter. It is a front view of the conventional spherical cutter shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Insert detachable spherical cutter 11 Tool body 15 End surface 24 Mounting seat 30 1st accommodation hole 31 1st press pin 31a 1st press surface 32 1st adjustment screw 33 1st adjustment mechanism 34 2nd accommodation hole 35 2nd press pin 35a Second pressing surface 36 Second adjusting screw 37 Second adjusting mechanism 50 Insert 53 Arc-shaped cutting edge (cutting edge)

Claims (2)

An insert having an arcuate cutting edge on a mounting seat formed on an end surface of the tool body facing the axis direction, the tool body having a tool body rotated about the axis in the tool rotation direction. The arc formed by the blade is detachably mounted so as to be positioned on a spherical surface having a center on the axis.
The tool body includes a first adjustment mechanism that adjusts the tool body radial position of the cutting blade, and the cutting blade in another direction that intersects the tool body radial direction when viewed from the front side in the tool rotation direction. An insert detachable spherical cutter, characterized in that a second adjusting mechanism for adjusting the position is provided. A first accommodation hole extending in a direction intersecting with the tool body radial direction when viewed from the axial direction is formed in the tool body radial inner side of the mounting seat,
In the first accommodation hole, as the first adjustment mechanism, a first pressing pin having a pressing surface that presses a side surface of the insert facing the inner side in the radial direction of the tool body is formed as a first adjusting mechanism, and the first pressing pin is pressed. The insert-detachable spherical cutter according to claim 1, wherein a first adjusting screw to be moved is accommodated.

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