JP2008238315A - Cutting tools - Google Patents

Abstract

In order to position a cutting insert, it is necessary to form a contact portion. On the other hand, there is a limit to the size of the insert separation surface, and an insert separation surface having a desired diameter is formed. I couldn't.
A cutting insert, an upper jaw portion and a lower jaw portion that sandwich the cutting insert at a tip portion, the upper jaw portion and the lower jaw portion being in contact with the cutting insert, and an insert contact surface A sandwiching member that is located on the rear end side and has an insert separation surface that is spaced apart from the cutting insert; and a contact member that is fixed to the sandwiching member and contacts the rear end surface of the cutting insert; It comprises.
[Selection] Figure 1

Description

  The present invention relates to a cutting tool used for cutting metal parts and the like.

  Conventionally, the thing of the structure shown in the side view of FIG. 12 is known as a cutting tool used for cutting of metal parts. Here, Fig.12 (a) is a conventional cutting tool, Comprising: It is a side view which shows the state in which the cutting insert was attached to the clamping member. FIG. 12B is a side view showing the state of the conventional cutting tool shown in FIG. 12A with the cutting insert removed from the clamping member.

  As shown in FIG. 12, a conventional cutting tool 102 is detachably disposed between a clamping member 110 having a stress relief portion 118 opened on one end side, and an upper jaw portion 106 and a lower jaw portion 108. Cutting insert 104 to be provided. A cutting edge 124 is formed at the tip of the cutting insert 104, and cutting can be performed by bringing the cutting edge 124 into contact with a rotating workpiece.

  At this time, since the cutting blade 124 is brought into contact with the work material, the cutting insert 104 is pushed backward. For this reason, the position of the cutting insert 104 is displaced, and it becomes difficult to perform highly accurate cutting. Therefore, the contact portion 116 is formed in the stress relief portion 118, and the contact portion 116 is brought into contact with the rear end surface 112 of the cutting insert 104 so as to position the cutting insert 104. Thereby, the position shift of the cutting insert 104 is suppressed also at the time of cutting.

Further, during cutting, the cutting insert 104 is subjected to a stress from above to below generated by cutting the work material with the cutting blade 124 in contact with the rotating work material. Therefore, a large stress is applied to the insert contact surface 116 of the lower jaw 108. Therefore, in the conventional cutting tool, the stress applied to the holding member 110 via the cutting insert 104 is distributed by forming the stress relief portion 118.
Special Table 2002-536191 gazette

  In order to disperse the stress applied to the clamping member via the cutting insert, it is desirable to make the insert separation surface as large as possible. This is because if the insert separation surface is small, stress may not be sufficiently dispersed on the insert separation surface, and cracks may occur in a part of the insert separation surface.

  However, as shown in FIG. 12, in the conventional cutting tool, in order to position the cutting insert, it is necessary to form a contact portion. Therefore, there is a limit to the size of the insert separation surface, and an insert separation surface having a desired size cannot be formed. This has been a problem in producing a cutting tool having higher durability.

  In view of the above-mentioned problems, the object of the present invention is to form a large insert separation surface while positioning the cutting insert, thereby dispersing the stress applied to the clamping member over a wide range and suppressing the occurrence of cracks in the clamping member. There is to do.

  The cutting tool of the present invention comprises a cutting insert, an upper jaw part and a lower jaw part that sandwich the cutting insert at a tip part, and the upper jaw part and the lower jaw part are in contact with the cutting insert, and the insert A clamping member that is located on the rear end side from the contact surface and has an insert separation surface that is spaced apart from the cutting insert, and a contact that is fixed to the clamping member and abuts on the rear end surface of the cutting insert And a member.

  Moreover, it is preferable that the said contact member is spaced apart from the said insert separation surface. Alternatively, it is also preferable that the contact member is in contact with the insert separation surface. Furthermore, it is more preferable that a contact area between the contact member and the insert separation surface is larger than a contact area between the contact member and a rear end surface of the cutting insert.

  Moreover, it is more preferable that the maximum value of the distance between the insert separation surfaces in the upper jaw and the lower jaw is equal to or greater than the distance between the insert contact surfaces in the upper jaw and the lower jaw.

  Moreover, it is preferable that each said insert separation surface in the said upper jaw part and the said lower jaw part is a curved surface. Further, each of the insert separation surfaces in the upper jaw portion and the lower jaw portion may have a circular arc shape in cross section that is parallel to the width direction of the insert contact surface and perpendicular to the insert separation surface. More preferred.

  Moreover, it is preferable that each said insert separation surface in the said upper jaw part and the said lower jaw part is a circular arc shape of the cross section perpendicular | vertical to the width direction of the said insert contact surface.

  Moreover, it is preferable that each said insert contact surface in the said upper jaw part and the said lower jaw part has an angle which intersects with the said insert separation surface is 90 degree | times or more.

  Moreover, it is more preferable that the lower jaw portion has the insert separation surface formed above the insert contact surface. In the lower jaw, the insert separation surface is preferably formed above the insert contact surface.

  The tool holder of the present invention includes an upper jaw part and a lower jaw part that sandwich the cutting insert at a tip part, and the upper jaw part and the lower jaw part are in contact with each other when the cutting insert is sandwiched; A clamping member that is positioned on the rear end side of the insert contact surface and that is spaced apart when the cutting insert is clamped; and a clamping member that is fixed to the clamping member and that is fixed to the clamping member. And a contact member that contacts the rear end surface.

  The cutting method of the present invention is a cutting method of cutting a work material using any one of the above-described cutting tools, a proximity step of bringing the cutting tool relatively close to the work material, and the work material A cutting step of cutting the surface of the work material by bringing the cutting blade into contact with the surface of the work material, and a separation step of relatively moving the work material and the cutting tool away from each other. It is characterized by that.

  As described above, the cutting tool of the present invention includes a cutting insert, an upper jaw portion and a lower jaw portion that sandwich the cutting insert at the tip portion, and the upper jaw portion and the lower jaw portion are in contact with the cutting insert, and the insert contact. A sandwiching member that is positioned on the rear end side from the surface and has an insert separation surface that is spaced apart from the cutting insert, and a contact member that is fixed to the sandwiching member and contacts the rear end surface of the cutting insert; It has.

  For this reason, it is not necessary to form the contact part for positioning the cutting insert in contact with the rear end surface of the cutting insert in a part of the insert separation surface. Thereby, since a big insert separation surface can be formed, the stress concerning a clamping member can be disperse | distributed in a wide range. As a result, since it is possible to suppress the occurrence of cracks in the clamping member, it is possible to manufacture a cutting tool having high durability that can withstand a greater stress.

  Hereinafter, the cutting tool of this invention is demonstrated in detail using drawing. FIG. 1 is a partial perspective view of an example according to an embodiment of a cutting tool of the present invention, and shows a state of attachment of a cutting insert and a contact member to a clamping member. FIG. 2 is a partial side view of the embodiment shown in FIG. 2A shows a state where the cutting insert and the abutting member are attached to the clamping member, and FIG. 2B shows a state where the cutting insert and the abutting member are removed from the clamping member. Yes.

  As shown in FIGS. 1 and 2, the cutting tool 2 of the present embodiment includes a cutting insert 4, a clamping member 10 that includes an upper jaw portion 6 and a lower jaw portion 8 that sandwich the cutting insert 4 at a distal end portion, and a clamping member 10. And a contact member 14 of the cutting insert 4 that is fixed to the member 10 and contacts the rear end surface 12 of the cutting insert 4. Further, the upper jaw portion 6 and the lower jaw portion 8 respectively have an insert contact surface 16 that comes into contact with the cutting insert 4 and an insert separation surface 18 that is located on the rear end side from the insert contact surface 16 and is separated from the cutting insert 4. is doing.

  The cutting tool 2 of the present embodiment positions the cutting insert 4 by the contact member 14 that contacts the rear end surface 12 of the cutting insert 4. Therefore, even when the cutting insert 4 is brought into contact with the workpiece while the cutting tool 2 is in use and cutting is performed, the cutting insert 4 is not retracted and high-precision cutting is performed. Can do.

  And unlike the structure which has the conventional contact part, since the contact member 14 which is another member is arrange | positioned, the contact part for positioning the cutting insert 4 in the insert separation surface 18 is formed. There is no need, and it is possible to form the insert separation surface 18 having a larger radius of curvature compared to a conventional cutting tool. As a result, since the stress transmitted to the clamping member 10 via the cutting insert 4 can be dispersed and relaxed over a wide range, a highly durable cutting tool 2 can be provided.

  In the embodiment shown in FIG. 2, since the contact member 14 is separated from the insert separation surface 18, stress applied to the contact member 14 via the cutting insert 4 acts on the insert separation surface 18. Can also be prevented. As a result, it is possible to suppress the occurrence of cracks on the insert separation surface 18. For this reason, it is preferable that the contact member 14 is separated from the insert separation surface 18.

  In addition, the contact member 14 includes a contact portion 20 that contacts the rear end surface 12 of the cutting insert 4 and a screwing portion 22 that is located on the side of the clamping member 10. By fixing the screwing portion 22 to the side surface of the holding member 10, the front and rear of the cutting insert 4 are positioned through the contact portion 20.

  As described above, when the contact member 14 is fixed to the side surface of the clamping member 10 through screwing, pinning, or the like, the contact member 14 is placed in contact with the insert separation surface 18 described later. Compared to the embodiment to be provided, the arrangement of the contact member 14 is easier, and the processing of the clamping member 10 becomes easier.

  Moreover, when the contact member 14 of this embodiment is used, the contact member 14 can be removed easily. As a result, even if the contact member 14 is damaged, it is possible to continue using the clamping member 10 simply by replacing the contact member 14. That is, since only a crack is generated only in the contact member 14, it is possible to replace the member easily and at low cost.

  Further, the cutting insert 4 has various shapes having different lengths and angles of the cutting edge 24. By preparing the contact member 14 having a shape corresponding to each shape of the cutting insert 4, the same shape can be obtained. The clamping member 10 can be shared.

  Moreover, when fixing the contact member 14 to the clamping member 10, it is preferable to fix in the several location. By fixing at a plurality of locations, the displacement and rotation of the contact member 14 can be more reliably suppressed.

  On the other hand, as shown in FIGS. 3 to 5, it is preferable that the contact member 14 is in contact with the insert separation surface 18 because the positioning of the cutting insert 4 can be more reliably stabilized. This is because the cutting insert 4 and the insert separation surface 18 are in contact with each other via the contact member 14, so that it is possible to more reliably suppress the cutting insert 4 from retreating when the cutting tool 2 is used.

  Here, Fig.3 (a) is a side view of other embodiment of the cutting tool concerning this invention. FIG. 3B is a plan view of the embodiment shown in FIG. Furthermore, FIG.3 (c) is a front view of embodiment shown to Fig.3 (a). 4 and 5 are side views of other embodiments of the cutting tool according to the present invention.

  FIG. 3 shows another embodiment of the present invention, which includes a pin-shaped contact member 14. As shown in FIG. 3, the abutting member 14 has a pin shape, so that the cutting insert 4 is sufficiently compared with the conventional positioning method using the abutting portion 114, although it has a simple shape. The effect of high stress relaxation can be exhibited while positioning.

  In the case of a conventional cutting tool, a part of the clamping member 110 is a contact portion 114, and the surface of the contact portion 114 and the insert separation surface 118 are integrally formed. And in order to suppress that a crack generate | occur | produces in the boundary part of the surface of the contact part 114 and the insert separation surface 118, the surface of the contact part 114 and the insert separation surface 118 need to be connected smoothly. there were. For this reason, in the conventional cutting tool 102, the big insert separation surface 118 could not be formed.

  On the other hand, when the abutting member 14 which is a member different from the clamping member 10 is used as in the present embodiment, it is not integrally formed, so that a crack is formed at the boundary portion between the abutting member 14 and the clamping member 10. Will not occur. Therefore, it is not necessary that the surface of the contact member 14 and the insert separation surface 18 are smoothly connected, and as a result, a large insert separation surface 18 can be formed as shown in FIG. It has become.

  Furthermore, it is more preferable that the rear end side of the pin-shaped contact member 14 is embedded in the clamping member 10 as indicated by a one-dot chain line in FIG. This is because the position of the contact member 14 itself can be more reliably fixed by arranging the contact member 14 in this manner, and therefore, cutting with higher accuracy can be performed.

  Further, as shown in FIGS. 3B and 3C, the contact member 14 is preferably disposed on the inner side of the side surface of the holding member 10. It is because the damage of the cutting tool 2 can be effectively prevented by arranging the contact member 14 on the inner side than the side surface of the holding member 10. As in the embodiment shown in FIG. 2, when the contact member 14 and the insert separation surface 18 are separated from each other, a screwing portion 22 or the like is provided on the side of the holding member 10 in order to fix the contact member 14. It is necessary to provide a fixed part with the clamping member 10. However, when the contact member 14 is disposed on the inner side of the side surface of the clamping member 10, it is not necessary to form a fixed portion such as the screwing portion 22 on the side of the clamping member 10. Even when the tool 2 is viewed in plan, the contact member 14 does not protrude to the side of the clamping member 10.

  Therefore, it is possible to prevent the chips of the work material generated during cutting from hitting the contact member 14, or the chips hitting the contact member 14 from bouncing back and hitting the cutting insert 4 or the sandwiching member 10. As a result, damage to the cutting tool 2 can be effectively prevented. Furthermore, since the length of the longitudinal direction that can be used for cutting increases because the contact member 14 does not protrude to the side of the holding member 10, deeper cutting can be performed. The accuracy can also be increased.

  FIG. 4 shows another embodiment of the present invention, which includes a spherical contact member 14. As shown in FIG. 4, by providing the spherical contact member 14, the durability of the cutting tool 2 can be further increased. This is because the contact surface between the contact member 14 and the sandwiching member 10 has a spherical shape, so that stress on the sandwiching member 10 can be effectively dispersed. Thereby, it can suppress more reliably that a crack arises in the clamping member 10. FIG. Further, since the contact member 14 has a spherical shape, the durability of the contact member 14 itself can be improved. This is because the stress acting on the abutting member 14 itself can be dispersed at the same time as the stress can be effectively dispersed with respect to the clamping member 10.

  FIG. 5 shows another embodiment of the present invention, which includes a cylindrical contact member 14 having a bottom surface in the side surface direction of the cutting tool 2. In the case where such a cylindrical contact member 14 is provided, the contact member 14 can be easily disposed on the insert separation surface 18, so that it has high durability and is less expensive. The cutting tool 2 can be produced.

  When the pin-shaped contact member 14 or the spherical contact member 14 is used, in order to dispose these contact members 14 on the insert separation surface 18, the cutting insert 4 is connected to the upper jaw 6. The abutting member 14 is inserted toward the insert separation surface 18 between the upper jaw portion 6 and the lower jaw portion 8 as in the case of being inserted between the lower jaw portion 8 and disposed and fixed on the insert separation surface 18. There is a need to.

  On the other hand, in the case of the cylindrical contact member 14 described above, the contact member 14 can be disposed and fixed from the side surface direction of the holding member 10. That is, it is easier to dispose the cylindrical contact member 14 on the insert separation surface 18 than the pin-shaped contact member 14 and the spherical contact member 14.

  In particular, it is preferable that the cutting insert 4 and the insert separation surface 18 are in contact with each other via the contact member 14 in the longitudinal direction. By pressing the cutting tool 2 against the work material, the cutting insert 4 is subjected to stress such that the cutting insert 4 moves backward toward the other end of the holding member 10 in the longitudinal direction. It is possible to suppress the cutting insert 4 from retreating more reliably.

  Furthermore, the contact area between the contact member 14 and the insert separation surface 18 is more preferably larger than the contact area between the contact member 14 and the rear end surface 12 of the cutting insert 4. This is because the contact area between the contact member 14 and the insert separating surface 18 is made larger than the contact area between the contact member 14 and the cutting insert 4, so that the clamping member 10 is interposed from the cutting insert 4 via the contact member 14. This is because such stress can be dispersed in a wider range. As a result, the occurrence of cracks in the cutting tool 2 can be more reliably suppressed.

  Further, as shown in FIG. 2B, the maximum value L1 of the distance between the insert separation surfaces 18 in the upper jaw 6 and the lower jaw 8 is the respective insert contact in the upper jaw 6 and the lower jaw 8. It is preferable that the distance between the surfaces 16 is not less than L2. When cutting is performed by bringing the cutting edge 24 into contact with a rotating work material, stress is applied to the cutting edge 24 from the upper side to the lower side, and stress is applied to the lower jaw portion 8 through the cutting edge 24. . Therefore, a large stress is applied to the insert separation surface 18 of the lower jaw 8.

  Therefore, by setting the maximum value L1 between the insert separation surfaces 18 of the upper jaw 6 and the lower jaw 8 to be equal to or greater than the distance L2 between the insert contact surfaces 16 of the upper jaw 6 and the lower jaw 8. Since the radius of curvature of the insert separation surface 18 can be further increased, the stress can be more effectively dispersed and relaxed.

  Moreover, it is preferable that each insert separation surface 18 in the upper jaw part 6 and the lower jaw part 8 is a curved surface. This is because when the insert separation surface 18 has a curved shape, it is possible to suppress the local concentration of stress, and thus the durability of the cutting tool 2 can be improved.

  Further, each of the insert separation surfaces 18 in the upper jaw 6 and the lower jaw 8 is parallel to the width direction of the insert contact surface 16 and is perpendicular to the insert separation surface 18 in the shape of an arc. preferable. In other words, it is preferable that the curvature of the insert separation surface 18 is constant in a cross section that is parallel to the width direction of the insert separation surface 18 and perpendicular to the insert separation surface 18. In the present embodiment, the width direction means a direction orthogonal to the front-rear end direction and the up-down direction.

  As described above, the shape of the insert separation surface 18 in a cross section parallel to the width direction of the insert separation surface 18 and perpendicular to the insert separation surface 18 is circular, or the curvature of the insert separation surface 18 is constant. It is because it can suppress more reliably that stress concentrates on 18 fixed places locally. As a result, the stress can be effectively dispersed throughout the entire width direction of the insert separation surface 18, so that the durability of the cutting tool 2 can be further improved.

  Moreover, it is preferable that each insert separation surface 18 in the upper jaw part 6 and the lower jaw part 8 has a circular arc shape in a cross section perpendicular to the width direction of the insert contact surface 16. As described above, when the shape of the insert separation surface 18 in the cross section perpendicular to the width direction of the insert contact surface 16 is an arc shape or the curvature is constant, stress is locally applied to a certain place of the insert separation surface 18. It is because it can suppress more reliably that it concentrates. As a result, the stress can be effectively dispersed throughout the longitudinal direction and the thickness direction of the upper jaw portion 6 and the lower jaw portion 8, so that the durability of the cutting tool 2 can be further improved.

  Further, as shown in FIG. 2A, the angles θ1 and θ2 at which the insert contact surface 16 and the insert separation surface 18 intersect each other in the upper jaw 6 and the lower jaw 8 in a cross section perpendicular to the width direction. It is preferably 90 degrees or more. When the insert separation surface 18 is a curved surface, the angle at which the tangent line of the insert separation surface 18 and the insert contact surface 16 intersect in a cross section perpendicular to the width direction may be obtained.

  The upper jaw portion 6 and the lower jaw portion 8 are cross sections perpendicular to the width direction, and when the intersecting angle between the insert contact surface 16 and the insert separation surface 18 is an acute angle, the insert separation surface 18 and the insert contact surface 16 It receives stress with a thin thickness between. However, when the crossing angle between the insert contact surface 16 and the insert separation surface 18 of the upper jaw 6 and the lower jaw 8 in the cross section perpendicular to the width direction is 90 degrees or more, the entire lower jaw 8 Since the stress can be received by the thickness, the durability of the cutting tool 2 can be greatly improved.

  Furthermore, as shown in FIG. 6, in the lower jaw portion 8, the insert separation surface 18 is more preferably formed above the insert contact surface 16. Here, FIG. 6 is a side view of another embodiment of the cutting tool of the present invention. Thus, the thickness of the lower jaw portion 8 can be increased while the maximum value L1 of the distance between the insert separation surfaces 18 of the upper jaw portion 6 and the lower jaw portion 8 is kept large by forming the insert separation surface 18. This is because it can be enlarged.

  Compared to the case where a part of the insert separation surface 18 is formed below the insert contact surface 16 as in the cutting tool of the embodiment shown in FIG. In the embodiment, even in the lower part of the insert separation surface 18, the region having a small thickness does not exist in the lower jaw portion 8, and the thickness of the lower jaw portion 8 can be kept large. As already shown, if a region having a small thickness exists in the lower jaw 8, durability in this region is lowered. However, since the thickness of the lower jaw portion 8 can be kept large by forming the insert separation surface 18 as in the present embodiment, the durability of the cutting tool 2 can be further improved.

  Next, the tool holder of this invention is demonstrated with reference to drawings.

  FIG. 8 shows a process diagram of the cutting method of the present invention. The tool holder 15 according to the present invention is fixed to the clamping member 10 having the upper jaw portion 6 and the lower jaw portion 8 with which the cutting insert 4 is sandwiched at the distal end portion, and abuts against the rear end surface 12 of the cutting insert 4. And an abutting member 14. Further, the upper jaw portion 6 and the lower jaw portion 8 are positioned on the rear end side from the insert contact surface 16 when the cutting insert 4 is sandwiched, and are separated when the cutting insert 4 is sandwiched. Each having an insert separating surface 18.

  For this reason, it is not necessary to form the contact part for positioning the cutting insert 4 in contact with the rear-end surface 12 of the cutting insert 4 in a part of the insert separation surface 18. Thereby, since the big insert separation surface 18 can be formed, the stress concerning the clamping member 10 can be disperse | distributed in a wide range. As a result, the occurrence of cracks in the sandwiching member 10 is suppressed, so that the tool holder 15 having high durability that can withstand a greater stress can be manufactured.

  Next, the cutting method of this invention is demonstrated with reference to drawings.

  9 to 11 show process diagrams of the cutting method of the present invention. First, the cutting insert 4 is attached to the holding member 10. Then, as shown in FIG. 9, the work material 46 is rotated to bring the cutting edge 24 of the cutting tool 2 closer to the work material 46. The cutting blade 24 and the work material 46 may be relatively close to each other. For example, the work material 46 may be close to the turning tool 24.

  Next, as shown in FIG. 10, the work material 46 is cut by bringing the cutting edge 24 into contact with the work material 46. Thereafter, the cutting tool 2 is separated from the work material 46 as shown in FIG. In addition, when continuing a cutting process, the process which hold | maintains the state which rotated the workpiece 46 and makes the cutting blade 24 of the cutting tool 2 contact the different location of the workpiece 46 is repeated.

  As the above-described cutting method, the outer diameter machining has been described as an example.

  The cutting tool 2 of the embodiment shown in FIGS. 1 and 2 has an insert contact surface 16 in contact with the cutting insert 4 at the tip, and an insert separation that is located on the rear end side from the insert contact surface 16 and is separated from the cutting insert 4. The upper jaw 6 and the lower jaw 8 are spaced apart from each other, each having a face 18. Furthermore, in the cutting tool 2 of this embodiment, the holder part 26 is formed in the other end side of the upper jaw part 6 and the lower jaw part 8 which are mutually separated. The upper jaw portion 6 and the lower jaw portion 8 are connected to each other through the holder portion 26.

  A screw hole 30 for inserting the clamp screw 28 from the upper jaw 6 to the lower jaw 8 is formed. By tightening the clamp screw 28, the cutting insert 4 is pressed against the upper jaw portion 6 and the lower jaw portion 8, so that the cutting insert 4 can be fixed to the cutting tool 2.

  Moreover, when especially high durability is calculated | required by the clamping member 10 whole, it is preferable that the upper jaw part 6, the lower jaw part 8, and the holder part 26 are integrally formed. This is because, since these are integrally formed, no joining surface is formed between the upper jaw portion 6 and the holder portion 26 and between the lower jaw portion 8 and the holder portion 26, so that the rigidity of the cutting tool 2 can be further increased.

  In order to reduce the cost of the cutting tool 2 while obtaining the effects of the present invention, it is also effective that the material of the lower jaw portion 8 is higher than the material of the upper jaw portion 6 and the holder portion 26. When the cutting tool 2 is used, the tip of the cutting insert 4 is pressed from above, so that a stronger stress is more easily applied to the lower jaw 8 than to the upper jaw 6 or the holder 26. Since a highly rigid material is expensive or requires a high level of processing, a highly rigid material is used for the lower jaw portion 8 that is subjected to relatively large stress, and an upper jaw portion having a small comparative adaptive force. This is because the cutting tool 2 having high durability and low cost can be manufactured by using a material that is easy to work with lower rigidity than the lower jaw portion 8 for the holder 6 and the holder portion 26.

  Further, it is preferable that a slit 32 formed toward the rear end is provided between the upper jaw portion 6 and the lower jaw portion 8 on the rear end side with respect to the insert separation surface 18. As shown in FIG. 2, since the upper jaw 6 and the lower jaw 8 are easily elastically deformed by forming the slit 32, the cutting insert 4 can be easily attached to and detached from the cutting tool 2.

  In the embodiment shown in FIG. 7, the cutting insert 4 has a substantially rectangular parallelepiped shape, and includes a rake face 34 at both ends of the upper surface, a front relief face 36 at the end face, and a lateral relief face 38 at the side face. Further, a front cutting edge 40 is provided at a crossing ridge line portion between the rake face 34 and the front flank face 36, and a horizontal cutting edge 42 is provided at a cross ridge line part between the rake face 34 and the side flank face 38. Here, FIG. 7 is an enlarged perspective view of the cutting insert 4 of the embodiment shown in FIG.

  The cutting insert 4 has an upper clamp surface 44a on the upper surface and a lower clamp surface 44b on the lower surface, and the upper jaw portion 6 and the lower jaw portion 8 of the holding member 10 are respectively fitted with the clamp surfaces 40a and 40b. It is preferable to provide. This is because by providing such a clamp surface 44, the position of the cutting insert 4 is stabilized, so that the positioning accuracy can be further increased.

  In particular, as shown in FIG. 7, each of the clamp surfaces has a concave shape in the upper clamp surface 44 a and the lower clamp surface 44 b of the cutting insert 4, and the clamp surfaces formed on the upper jaw portion 6 and the lower jaw portion 8 respectively. A convex shape is preferred. This is because, by forming such clamp surfaces 44, the possibility of cracking in the upper jaw 6 or the lower jaw 8 can be further suppressed, and a stronger cutting tool 2 can be produced.

  The cutting insert 4 can be fixed to the clamping member 10 as follows, for example. First, the contact member 14 is fixed to a predetermined position of the holding member 10. Then, the cutting insert 4 is inserted between the upper jaw portion 6 and the lower jaw portion 8, and the rear end surface 12 of the cutting insert 4 is pressed against the contact member 14. When the above-described clamping surfaces 44 are formed on the cutting insert 4, the upper jaw portion 6, and the lower jaw portion 8, the cutting insert 4 is inserted along the respective clamping surfaces 44 of the upper jaw portion 6 and the lower jaw portion 8. That's fine.

  Next, the clamp screw 28 is tightened in such a state. By tightening the clamp screw 28, the upper jaw 6 is elastically deformed and pushed down. As a result, the cutting insert 4 is pressed and fixed to the upper jaw 6 and the lower jaw 8.

  In FIG. 3C, the clamp surfaces 44 of the upper jaw portion 6 and the lower jaw portion 8 are formed so that the cross section perpendicular to the longitudinal direction of the sandwiching member 10 is a V-shaped projection, and the cutting insert 4 The upper clamp surface 44a and the lower clamp surface 44b are formed to be recesses that fit in correspondence with the respective protrusions. Thus, when the cutting surfaces 44 are formed on the cutting insert 4, the upper jaw portion 6, and the lower jaw portion 8, the cutting insert 4 is positioned between the upper jaw portion 6 and the lower jaw portion 8 without being displaced from side to side. Can be inserted into.

  Further, when the slit 32 is formed, the upper jaw 6 is more easily elastically deformed by the slit 32, so that the tip of the upper jaw 6 can be pushed down more easily.

  The cutting insert 4 preferably includes a plurality of cutting blades 24. When the cutting insert 4 provided with a plurality of cutting blades 24 is used, another non-wearing cutting blade 24 can be used for the wear of the cutting blade 24 due to long-term use. This is because it is not necessary to prepare an appropriate cutting insert 4 and is economical. For example, in the cutting tool 2 of the present embodiment, when one of the cutting blades 24 is worn, the cutting insert 4 is removed from the cutting tool 2 and the directions of the front end side and the rear end side of the cutting insert 4 are switched. What is necessary is just to attach to the cutting tool 2 again. Thereby, the cutting blade 24 which is not worn can be positioned outside the clamping member 10 and used for cutting.

  In addition, even if the number of the cutting blades 24 is one because the new effect of being economical is obtained by providing the plurality of cutting blades 24 as in the present embodiment, Needless to say, the effects of the present invention can be obtained without any problems.

It is a fragmentary perspective view of an example concerning the embodiment of the cutting tool of the present invention. (A) is embodiment of the cutting tool shown in FIG. 1, and is a side view of the state in which the cutting insert and the contact member were attached to the clamping member. (B) is an embodiment shown in Drawing 1, and is a side view in the state where a cutting insert and a contact member were removed from a pinching member. (A) is a side view of other embodiment of the cutting tool concerning this invention. FIG. 3B is a plan view of the embodiment shown in FIG. (C) is a front view of the embodiment shown in FIG. It is a side view of other embodiment of the cutting tool of this invention. It is a side view of other embodiment of the cutting tool of this invention. It is a side view of other embodiment of the cutting tool of this invention. It is an expansion perspective view of the part by which the cutting insert of the cutting tool of embodiment shown in FIG. 1 is arrange | positioned. It is a fragmentary perspective view of an example concerning embodiment of the tool holder of the present invention. It is process drawing of the cutting method of this invention. It is process drawing of the cutting method of this invention. It is process drawing of the cutting method of this invention. (A) is a conventional cutting tool, and is a side view of a state in which a cutting insert is attached to a clamping member. (B) is the conventional cutting tool shown to Fig.8 (a), and is a side view of the state from which the cutting insert was removed from the clamping member.

Explanation of symbols

2, 102 ... Cutting tool 4, 104 ... Cutting insert 6 ... Upper jaw part 8 ... Lower jaw part 10, 110 ... Holding member 12, 112 ... Rear end face 14 ... Contact Member 15 ... Tool holder 16 ... Insert contact surface 18, 118 ... Insert separation surface 46 ... Work material

Claims (12)

Cutting inserts,
An upper jaw portion and a lower jaw portion for sandwiching the cutting insert at a distal end portion, the upper jaw portion and the lower jaw portion being positioned on the rear end side from the insert contact surface, the insert contact surface contacting the cutting insert, and the A sandwiching member each having an insert separation surface spaced apart from the cutting insert;
A cutting tool comprising: an abutting member fixed to the clamping member and abutting against a rear end surface of the cutting insert.   The cutting tool according to claim 1, wherein the contact member is separated from the insert separation surface.   The cutting tool according to claim 1, wherein the contact member is in contact with the insert separation surface.   The cutting tool according to claim 3, wherein a contact area between the contact member and the insert separation surface is larger than a contact area between the contact member and a rear end surface of the cutting insert.   The maximum value of the distance between the respective insert separation surfaces in the upper jaw and the lower jaw is equal to or greater than the distance between the respective insert contact surfaces in the upper jaw and the lower jaw. The cutting tool in any one of 1-4.   The cutting tool according to any one of claims 1 to 5, wherein each of the insert separation surfaces in the upper jaw and the lower jaw is a curved surface.   Each of the insert separation surfaces in the upper jaw portion and the lower jaw portion is parallel to the width direction of the insert contact surface and has a cross-sectional shape perpendicular to the insert separation surface in an arc shape. The cutting tool according to claim 6.   The cutting tool according to claim 6 or 7, wherein each of the insert separation surfaces in the upper jaw and the lower jaw has an arc shape in a cross section perpendicular to the width direction of the insert contact surface. .   The cutting tool according to any one of claims 1 to 8, wherein each of the insert contact surfaces in the upper jaw and the lower jaw has an angle of 90 degrees or more with the insert separation surface. .   The cutting tool according to claim 9, wherein in the lower jaw portion, the insert separation surface is formed above the insert contact surface. An upper jaw portion and a lower jaw portion that sandwich the cutting insert at a distal end portion, and an insert contact surface that comes into contact with the upper jaw portion and the lower jaw portion when the cutting insert is sandwiched, and a rear end from the insert contact surface Sandwiching members each having an insert separation surface that is located on the side and separates when the cutting insert is sandwiched; and
A tool holder, comprising: an abutting member fixed to the clamping member and abutting against a rear end surface of the cutting insert. A cutting method for cutting a work material using the cutting tool according to claim 1,
A proximity step of relatively bringing a cutting tool closer to the work material;
A cutting step of rotating the work material, bringing the cutting edge into contact with the surface of the work material, and cutting the surface of the work material;
A cutting method comprising: a separation step of relatively moving the work material and the cutting tool away from each other.

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