WO2015178489A1

WO2015178489A1 - Plate member for cutting tool, tool block, and cutting tool

Info

Publication number: WO2015178489A1
Application number: PCT/JP2015/064788
Authority: WO
Inventors: 正寛黒川
Original assignee: 株式会社タンガロイ
Priority date: 2014-05-23
Filing date: 2015-05-22
Publication date: 2015-11-26
Also published as: JP2017121668A

Abstract

The purpose of the present invention is to provide a plate-like member (2) wherein at least one cutting edge section (2A) and a holding section (2B) are positioned side by side along the longitudinal direction. The plate-like member has two facing side surfaces (7, 8), a top surface (3), a bottom surface (4), and two end faces (5, 6). The two side surfaces extend in the longitudinal direction, and the first side surface (7) is a curved surface expanding outward. The top and bottom surfaces extend between the two side surfaces. The two end faces extend in a direction intersecting the longitudinal direction, and the cutting edge section is positioned at least on one of the end faces (5). The top surface and/or bottom surface is a curved surface. The holding section has a constant profile across the longitudinal direction in a cross section taken perpendicular to the longitudinal direction.

Description

Cutting tool plate member, tool block, and cutting tool

The present invention relates to a plate-like member of a cutting tool. The present invention also relates to a tool block and a clamp member for fixing the plate member, and a cutting tool including the plate member.

Conventional cutting tools include those shown in Patent Document 1. That is, Patent Document 1 discloses an end surface grooving cutting tool for grooving an end surface of a workpiece. This cutting tool uses a member called an adjustment blade that can be exchanged in order to cope with a change in the machining diameter of a groove to be machined or a change in the width of a groove to be machined. A part of the adjustment blade has a curved plate shape. A cutting insert in the form of a grooving insert is detachably attached to the curved plate-shaped portion. The adjusting blade is fixed to the holder with two bolts.

Japanese Utility Model Publication No. 63-140303

However, the cutting tool of Patent Document 1 does not have a mechanism for adjusting the protruding length of the curved plate-shaped portion. That is, the protruding length of the curved plate-shaped part is fixed.

Generally, a cutting tool having a long projecting length from a holder having a curved plate-shaped portion has an advantage that it can process a deep groove with little interference with a workpiece and is easy to handle. On the other hand, a cutting tool with a long protruding plate-shaped portion tends to generate chatter vibration depending on the processing conditions, and the quality of the finished surface may deteriorate. Therefore, in order to meet the trade-off demands of enabling deep grooves to be machined or improving the quality of the finished surface, such overhang lengths are set to the shape of the workpiece and cutting conditions. Therefore, there is a need to stably hold a member that can be adjusted appropriately and protrudes as such.

The present invention has been made in view of the above circumstances, and the object thereof is to make it possible to hold the member with the blade portion more firmly and to adjust the protruding length of the blade portion. There is.

According to one aspect of the invention,
A plate-like member in which at least one blade part and a holding part are positioned along the longitudinal direction,
Two opposing side surfaces, each of the two side surfaces extending longitudinally, and a first side of the two side surfaces is a curved surface that bulges outward;
An upper surface and a lower surface, each of the upper surface and the lower surface extending in the longitudinal direction between the two side surfaces, the upper surface and the lower surface being positioned on different sides of the first side surface And the bottom surface,
Two end surfaces, each extending between the two side surfaces and between the upper surface and the lower surface, and extending in a direction crossing the longitudinal direction, the two end surfaces being An end face that is positioned on a different side of the first side face, and the blade portion is positioned on at least one of the two end faces.
At least one of the upper surface and the lower surface is a curved surface,
A plate member is provided.

Preferably, the holding portion has a constant cross-sectional shape perpendicular to the longitudinal direction in the longitudinal direction.

Preferably, the blade portion has a tip seat, and a cutting insert having a cutting edge is detachably attached to the tip seat. In this case, the cutting insert may be fixed by elasticity around the tip seat. Or the said blade part may be provided with the cutting blade integrally.

Preferably, the second side surface of the two side surfaces is a curved surface recessed inward. Preferably, the upper surface is a curved surface that bulges outward. Preferably, the lower surface is a curved surface that bulges outward.

At least one of the upper surface and the lower surface may have a curved shape along a part of a virtual cylinder having a central axis extending in the longitudinal direction. The upper surface may have a curved shape along a part of the first virtual cylinder whose central axis extends in the longitudinal direction, and the lower surface has a curved shape along a part of the second virtual cylinder whose central axis extends in the longitudinal direction. It is good to have. The radius around the central axis of the first virtual cylinder may be the same as the radius around the central axis of the second virtual cylinder, but is preferably different.

Preferably, the plate-shaped member is a cutting member for groove processing.

Another aspect of the present invention provides a tool block for holding the plate-like member. This tool block preferably has a lower surface constraining surface that contacts the lower surface of the plate-like member. Furthermore, the tool block further has a side restraint surface that contacts the first side surface of the plate-like member. The side constraining surface has at least two contact portions that contact the first side surface, and the at least two contact portions are at least two of the first side surface in a direction intersecting the longitudinal direction. It is good to be comprised so that a location may be contacted.

Still another aspect of the present invention provides a holding device for holding the plate-like member. The holding device is preferably configured to sandwich the plate member by the action of a fixing member between the tool block having at least a lower surface constraining surface that contacts the lower surface of the plate member. A clamping member having a top restraint surface in contact with the top surface of the plate-like member.

A further different aspect of the present invention provides a cutting tool including the plate-like member.

FIG. 1 is a perspective view of a cutting tool according to an embodiment of the present invention. FIG. 2 is a front view of the cutting tool of FIG. FIG. 3 is a perspective view of a plate-like member of the cutting tool of FIG. FIG. 4 is a right side view of the plate-like member of FIG. FIG. 5 is a front view of the plate-like member of FIG. FIG. 6 is a plan view of the plate-like member of FIG. FIG. 7 is a left side view of the plate-like member of FIG. FIG. 8 is a perspective view of a cutting insert of the cutting tool of FIG. FIG. 9 is a perspective view of a tool block of the cutting tool of FIG. FIG. 10 is a front view of the tool block of FIG. FIG. 11 is a plan view of the tool block of FIG. FIG. 12 is a left side view of the tool block of FIG. FIG. 13 is a perspective view of a clamp member of the cutting tool of FIG. FIG. 14 is a perspective view from another direction of the clamp member of FIG. FIG. 15 is a perspective view for explaining end face grooving by a plate-like member of the cutting tool of FIG. FIG. 16 is a rear view for explaining the end surface groove processing of FIG. 15. 17 is a cross-sectional view of the plate-like member of FIG. 3 along XVII-XVII of FIG.

An embodiment according to the present invention will be described with reference to the drawings.

A cutting tool 1 according to an embodiment of the present invention shown in FIGS. 1 and 2 is an end face grooving cutting tool for grooving an end face of a workpiece. End face grooving is grooving as shown in the conceptual diagrams of FIGS. 15 and 16. When the cutting tool 1 of this embodiment attached to a machine tool (for example, a lathe) is sent in the direction of the rotation axis O of the workpiece 60 with respect to the end surface 60E of the workpiece 60 rotating in the rotation direction R, an annular shape The groove 61 is processed. For easy understanding, FIGS. 15 and 16 show only the plate member 2 of the cutting tool 1 as the cutting tool 1. Actually, the plate-like member 2 becomes the cutting tool 1 by being fixed to the tool block 30 by the clamp member 40 and the fixing member 50. The holding device that holds the plate-like member 2 includes a tool block 30, a clamp member 40, and a fixing member 50.

This cutting tool 1 uses a cutting insert 20 shown in FIG. The cutting insert 20 has a cutting edge 20E at the intersecting ridge line portion of the front surface 20F, the left and right side surfaces 20L, 20R, and the upper surface (rake surface) 20T. However, the shape of the cutting edge and the shape of the cutting insert 20 are not limited to this embodiment. Various known shapes of the cutting insert 20 can be applied.

The cutting tool 1 of this embodiment is a cutting tool 1 that is particularly suitable for end face grooving. As described above, in the end face grooving process, since the shape of the groove 61 to be processed is an annular shape, a portion around the cutting edge 20E of the cutting tool 1 to be applied is preferably a curved plate. . Since the peripheral portion of the cutting edge of the cutting tool 1 has a curved plate shape, the plate-like portion can be stored in the annular groove 61 as shown in the conceptual diagram of FIG. The rigidity that supports the blade is maintained. In the present embodiment, the plate-like member 2 is used as a member constituting a curved plate-like portion around the cutting edge.

The cutting insert 20 is detachably attached to the chip seat 13 of the plate-like member 2. In the end face grooving cutting tool 1, various known grooving cutting inserts 20 can be applied. In this embodiment, the cutting insert 20 is fixed by elasticity around the chip seat 13. That is, when the cutting insert 20 is mounted, the shank 22 on the proximal end side of the cutting insert 20 is pushed into the chip seat 13 having an inner surface shape that fits into this, and the periphery of the chip seat 13 is elastically deformed. The cutting insert 20 is fixed to the chip seat 13. When the cutting insert 20 is removed, the periphery of the tip seat 13 is released from elastic deformation. The holes 2H provided in the plate-like member 2 shown in FIG. 4 and the like are dedicated tool holes for removing the cutting insert 20. A dedicated tool for attaching or removing the cutting insert 20 is called a wrench, a driver, or the like. By using the cutting tool 1 for cutting, when the cutting insert 20 is damaged such as wear, it can be replaced with another cutting insert 20. Therefore, this cutting tool 1 can be used repeatedly and is economical. When the cutting insert 20 is fixed by the elasticity around the tip seat 13 in this way, the structure around the tip seat 13 is simple, and there are no parts that interfere with the workpiece 60. For this reason, particularly in the end face grooving process, chip discharge is high, which is advantageous in performing highly accurate processing.

However, the fixing method for mounting the cutting insert 20 to the plate-like member 2 is not limited to this embodiment. Various known cutting insert fixing methods are applicable. For example, the cutting insert can be fixed by a clamp member such as a presser piece or by screwing. However, in consideration of deep groove processing and chip discharge, it is highly desirable to have a structure in which the clamp member and screw head do not protrude from the plate-like member 2.

Further, the present invention is not limited to using the detachable cutting insert 20. A chip having a cutting edge may be brazed to the plate-like member 2. Further, the plate-like member itself may be made of a hard material such as cemented carbide or ceramic, and may have a cutting edge integrally (not shown).

In the cutting tool 1 of this embodiment, the width (the length between the side surfaces 20L and 20R) of the portion of the cutting edge 20E formed at the intersecting ridge line portion between the front surface 20F and the upper surface 20T is the width of the cutting blade. In the cutting insert 20, the width of the cutting edge is about 4 mm. That is, the cutting tool 1 provided with the cutting insert 20 is a cutting tool for end face grooving suitable for processing a groove 61 having a groove width of about 4 mm on the workpiece 60. However, the width of the cutting edge is not limited to this embodiment. The width of the cutting edge may be appropriately selected according to the width of the groove of the workpiece to be processed.

As described above, the plate member 2 is fixed to the tool block 30 by the clamp member 40 and the fixing member 50. The tool block 30 has an attachment reference surface 31. The tool block 30 is mounted on the mounting portion while the portion of the mounting reference surface 31 is brought into contact with the mounting portion of a machine tool such as a lathe. The lathe mounting part is called a tool post or the like. Details of the configuration of the tool block 30 will be described later. First, the plate-like member 2 will be described in detail.

The plate-like member 2 has one blade part 2A and one holding part 2B. The blade part 2A and the holding part 2B are positioned side by side along the longitudinal direction LA. In particular, the blade portion 2 </ b> A includes the tip seat 13. The holding portion 2B extends in the longitudinal direction LA, and the cross-sectional shape perpendicular to the longitudinal direction is constant as will be apparent from the following description.

3 to 7, the plate-like member 2 has an upper surface 3, a lower surface 4, two

end surfaces

5 and 6, a first side surface 7, and a second side surface 8. The two

end surfaces

5 and 6 are referred to as a front end surface 5 and a rear end surface 6 for convenience. The blade portion 2A including the tip seat 13 is positioned on the front end face 5 side. In particular, the tip seat 13 is formed in an intersecting region between the front end surface 5 and the upper surface 3. For ease of explanation, terms such as the upper surface 3 and the front end surface 5 are used to indicate the orientation in the space. However, this is for convenience, and the absolute orientation and positional relationship in the space are determined. It is not intended to be specified. Unless otherwise noted, the same applies to terms representing orientations and positional relationships in other spaces.

As shown in FIG. 4, FIG. 6, and FIG. 7, the first and second side surfaces 7, 8 are each elongated and extend in the longitudinal direction LA. 3 and 5 and the like, the first side surface 7 of the plate-like member 2 is a curved surface that curves so as to protrude outward. That is, the first side surface 7 is a curved surface that swells outward. The second side surface 8 opposite to the first side surface 7 (that is, facing the first side surface 7) is a curved surface that curves so as to be recessed inward. The shapes of the first and second side surfaces 7 and 8 are restricted so as not to interfere with the processed shape of the workpiece. That is, as shown in the conceptual diagram of FIG. 16, in the case of end face grooving, a part of the plate-like member 2 (part on the front end side or the front end face 5 side) is inside the groove 61 processed into an annular shape. By being able to enter, even when the cutting edge 20E is fed to the depth of the groove, the cutting insert 20 and thus the cutting edge 20E can be stably held. In other words, the plate-like member 2 is curved so as to be able to enter the groove 61 processed into an annular shape of the workpiece without interference. That is, the radius of curvature of the second side surface 8 is set to be equal to or greater than half the machining diameter (diameter) of the wall surface on the center O side of the annular groove 61 in which the workpiece is processed (that is, the curvature radius r1). The radius of curvature of the first side surface 7 is equal to or less than a radius of curvature r2 (r2 = r1 + width of the cutting edge) obtained by adding the width of the cutting edge to half the machining diameter (diameter) r1. By setting the curvature radii of the first and second side surfaces 7 and 8 as described above, the plate-like member 2 is ensured to escape on both sides between the processed groove and the groove. That is, the plate-like member 2 has a positive clearance angle on both

side surfaces

7 and 8 thereof at the fixed portion of the cutting insert 20, that is, the blade portion 2A, at the time of cutting. In addition, in the plate-like member 2, since both

side surfaces

7 and 8 have substantially the same curved shape from the blade portion 2A to the holding portion 2B, even cutting processing in which up to a part of the holding portion 2B is inserted into the groove, Sufficient escape can be secured.

As seen in the right side view of FIG. 4, when viewed from the direction facing the first side surface 7, the outer shape of the plate-like member 2 has two

long sides

9 and 10 and two

short sides

11 and 12, respectively. It has a substantially quadrilateral shape, and in this case, a substantially rectangular shape. The two

long sides

9 and 10 are substantially parallel to each other and extend in the longitudinal direction. Here, the boundary between the first side surface 7 and the lower surface 4 is defined as the first long side 9. The intersecting ridge line between the first side surface 7 and the front end surface 5 is defined as a first short side 11. A clear intersection ridge line is not formed at the boundary between the first side surface 7 and the lower surface 4 and they are smoothly connected. Therefore, the first long side 9 is not clear but is configured to be clear. May be. The same applies to the other long side (second long side) 10. Thus, when the plate-like member 2 is formed into a substantially quadrilateral shape in a side view, the cross-sectional shape of the holding portion 2B in the longitudinal direction can be made constant, and the plate-like member 2 protrudes from the tool block 30 in the longitudinal direction LA. The length can be adjusted easily and more reliably. Specifically, the plate-like member 2 protrudes from the tool block 30 in a direction (longitudinal direction LA) parallel to the first long side 9 of the boundary (crossing ridge line) between the lower surface 4 and the first side surface 7. The shape of the cross section perpendicular to the first long side 9 is constant within a predetermined range so that the length can be adjusted. That is, since the cross-sectional shape of the plate-like member 2 is constant within a predetermined range and this portion becomes the holding portion 2B, the plate-like member 2 is clamped at an arbitrary position in a direction parallel to the first long side 9. It is possible.

The contact position of the plate-like member 2 with the tool block 30 and the clamp member 40 can be shifted within a predetermined range necessary for adjusting the protruding length of the plate-like member 2. The predetermined range is determined such that the first long side 9, that is, the cross-sectional shape orthogonal to the longitudinal direction LA is within a certain range. This constant cross-sectional shape is shown in FIG. FIG. 17 shows a cross section of the plate-like member 2 taken along the line XVII-XVII in FIG. However, the cross section taken along the line XVII-XVII is a cross section taken along a plane perpendicular to the longitudinal direction LA. Further, a cross-sectional view in a plane orthogonal to the longitudinal direction LA at an arbitrary position within a predetermined range PR between the line L1 and the line L2 in FIG. 4 is as shown in FIG. The line L1 is a line along the end of the inclined surface 3a on the rear end surface 6 side, and the line L2 is a line along the rear end surface 6. In the plate member 2, the front end surface 5 and the rear end surface 6 extend so as to be orthogonal to the longitudinal direction LA. However, the front end face 5 and the rear end face 6 may extend in various directions that intersect the longitudinal direction.

An inclined surface 3 a that is a part of the upper surface 3 is formed around the chip seat 13 of the plate-like member 2. The inclined surface 3a is a surface that is used as a chip pocket for discharging chips, and is included in the blade portion 2A. However, in the cutting tool 1 of this embodiment, the inclined surface 3a is not curved concavely, but is flat. Therefore, the inclined surface 3a may be referred to as a chip guide surface instead of a chip pocket. The chip guiding surface is a surface that guides the chip to be discharged from the processed groove of the workpiece. In the cutting tool 1 of this embodiment, the predetermined range in which the cross-sectional shape is constant is the range PR described above, which is the entire region of the chip guiding surface, that is, the portion on the rear end surface side of the inclined surface 3a. That is, the cross-sectional shape of the rear end portion of the plate-like member 2 from the rear end face 6 to the area where the chip guiding surface starts is constant. If the cross-sectional shape is formed in such a shape, it is easy to manufacture the plate-like member 2 with high accuracy by grinding or the like. That is, the clamp rigidity can be increased. However, it is not limited to this. The range in which the cross-sectional shape is constant may be ensured according to the adjustment amount of the protruding length of the front end side portion (the front end surface 5 side portion) of the plate-like member 2. The portion that does not affect the adjustment of the protruding length may have any shape.

As seen in the sectional view of FIG. 17 and the front view of FIG. 5, the upper surface 3 and the lower surface 4 extending in the longitudinal direction of the plate member 2 are respectively curved surfaces that bulge outward. Both the upper surface 3 and the lower surface 4 are surfaces that are used as contact surfaces when the plate-like member 2 is fixed to the tool block 30. When the plate-like member 2 is attached, the lower surface 4 comes into contact with the tool block 30. When the plate-like member 2 is attached, the upper surface 3 comes into contact with the clamp member 40. If the upper surface 3 is not a curved surface but a flat surface, the contact state between the plate-like member 2 and the clamp member 40 tends to become unstable. Because the first side surface 7 and the second side surface 8 of the plate-like member 2 are curved, when the plate-like member 2 is elastically deformed by applying a clamping force, the inclination angle of the upper surface 3 with respect to the lower surface 2 changes. Resulting in. Then, the contact between the upper surface 3 and the clamp member 40 changes from surface contact to line contact or point contact. In either case of line contact or point contact, the contact location is located on the edge line of the corner portion of the upper surface 3, and the corner portion is crushed and plastic deformation is likely to occur. Therefore, problems such as a decrease in clamp rigidity may occur during the cutting process. By making the upper surface 3 a curved surface, even if the plate-like member 2 is elastically deformed, the upper surface 3 can continue to be in firm contact with the clamp member 40 within the surface. For the same reason as that for the upper surface 3, the lower surface 4 is also a curved surface.

In the cutting tool 1 of this embodiment, the upper surface 3 and the lower surface 4 of the plate-like member 2 are respectively cylindrical surfaces. This means that the upper surface 3 has a curved shape along a part of the first virtual cylinder C1 extending in the longitudinal direction, and similarly, the lower surface 4 is along a part of the second virtual cylinder C2 extending in the longitudinal direction. It means having a curved shape. The radius Cr1 centered on the central axis Ca1 extending in the longitudinal direction of the first virtual cylinder C1 on the upper surface 3 is different from the radius Cr2 centered on the central axis Ca2 extending in the longitudinal direction of the second virtual cylinder C2 on the lower surface 4. However, it is not intended to exclude that this is the same. However, as mentioned above, the first and second side surfaces 7, 8 are shaped to avoid interference with the groove 61, so that the radius Cr1 for the upper surface 3 is designed to be larger than the radius Cr2 for the lower surface 4. Preferably, the plate-like member 2 is so designed. In addition, the upper surface 3 is formed so that the cross section in the direction orthogonal to the longitudinal direction of the upper surface 3 does not change depending on the location, and this also applies to the lower surface 4.

For this reason, the upper surface 3 and the lower surface 4 can contact the tool block 30 and the clamp member 40, respectively, at approximately the center of the surface (that is, at approximately the same distance from the first side surface 7 and the second side surface 8). it can. Therefore, the fixed state of the plate-like member 2 to the tool block 30 is stabilized every time. However, it is not limited to this. The curved shape of the upper surface 3 and the lower surface 4 may be any shape as long as it can contact the tool block 30 and the clamp member 40. For example, the contact position of the lower surface 4 with the tool block 30 may be biased toward the second side surface 8 or the like. The upper surface 3 and the lower surface 4 may be curved surfaces that are concave inward. However, since the contact surface on the tool block 30 side is a flat surface as will be described later, it is preferable that the upper surface 3 and the lower surface 4 of the plate-like member 2 are outwardly convex curved surfaces. If the contact surface on the tool block 30 side is a flat surface, it is easy to manufacture, and the cutting tool 1 with high clamping rigidity can be obtained at a low cost. The plate-like member 2 is firmly fixed to the tool block 30 by using at least three surfaces of the upper surface 3, the lower surface 4 and the first side surface 7 as contact surfaces. As a result, the clamp rigidity is increased and the occurrence of chatter vibration can be suppressed. Therefore, the quality of the finished surface can be improved by fixing by this three-surface contact. When the upper surface 3 and the lower surface 4 are curved surfaces, at least one of the upper surface 3 and the lower surface 4 may be approximated by a polyhedron in which a large number of elongated planes are arranged in the longitudinal direction. As long as the obtuse angle is set so as not to cause plastic deformation by the contact of the plate-like member 2 with the tool block 30, the curved surface may be approximated by a polyhedron and a large number of corners may be formed. However, it is preferable to exclude those having a simple chamfer at the corners of the upper surface 3 and the lower surface 4 and the side surfaces 7 and 8. When a curved surface is formed by adding chamfering or the like, a curved surface chamfering, so-called R chamfering, or the like is preferable. Note that it is preferable that the entire upper surface 3 or the lower surface 4 is a curved surface, not a curved surface only by a curved chamfer.

As described above, as shown in FIGS. 9 and 10, the tool block 30 of the cutting tool 1 of this embodiment has an attachment reference surface 31. A longitudinal direction is defined on the attachment reference surface 31. The longitudinal direction of the tool block 30 is defined such that the longitudinal direction LA of the plate-like member 2 coincides when the plate-like member 2 is attached to the tool block 30. Therefore, the longitudinal direction of the tool block 30 is regarded as the same as the longitudinal direction LA of the plate-like member 2, and the following description is continued.

The tool block 30 is formed so that the cross-sectional shape orthogonal to the longitudinal direction is constant at an arbitrary position in the longitudinal direction as a whole. One end surface of the tool block 30 viewed from the longitudinal direction LA is defined as a front surface 30F. Here, the surface in the direction of the front side of FIG. The periphery of the attachment reference plane 31 can also be called a shank portion. The mounting reference surface 31 is pressed against a tool post of a machine tool such as a lathe, and the tool block 30 is mounted on the machine tool. That is, the tool block 30 is a member for holding the plate-like member 2 and mounting it on the machine tool.

The tool block 30 of this embodiment has a wall surface 31a perpendicular to the mounting reference surface 31 formed on the lower surface side. This right-angle wall surface 31a can also be used as a reference surface in the width direction when the tool block 30 is mounted on a machine tool. The reference mounting surface 31 and the reference surface 31a in the width direction of the tool block 30 have shapes corresponding to a tool rest, a holder, an adapter, and the like of the machine tool, and the shapes can be arbitrarily selected or set.

The tool block 30 has a lower surface restraining surface 32 that contacts the lower surface 4 of the plate-like member 2. The lower surface restraining surface 32 extends in the longitudinal direction, and is formed so that a cross-sectional shape orthogonal to the longitudinal direction is constant at an arbitrary position in the longitudinal direction. The lower surface restraining surface 32 is positioned so that the lower surface 4 of the plate-like member 2 can come into contact therewith. In the present embodiment, as the first side surface 7 is curved, the upper surface 3 and the lower surface 4 have a positional relationship between both ends of a predetermined arc CA (FIG. 17). In addition, the cutting edge 20 </ b> E positioned on the upper surface 3 side in FIG. 2 is arranged substantially parallel to the attachment reference surface 31. Therefore, the lower surface restraining surface 32 with which the lower surface 4 comes into contact is inclined with respect to the attachment reference surface 31. That is, when the plate-like member 2 is placed on the tool block 30, the lower surface restraining surface 32 is oriented in a direction intersecting the arc CA in FIG. . In particular, the lower surface restraining surface 32 is inclined so as to apply a force from the second side surface 8 side to the first side surface 7 side to the plate member 2 via the lower surface 3 of the plate member 2. Yes. In this embodiment, the lower surface restraining surface 32 of the tool block 30 is a flat surface so that the contact state with the curved lower surface 4 is uniform. However, the shape of the lower surface restraint surface 32 is not limited to this. The lower surface restraining surface 32 may be a surface having any shape as long as the lower surface restraining surface 32 has a contact area with a certain degree of uniform contact with the lower surface 4. The inclination angle A shown in the front view of FIG. 10 with respect to the attachment reference surface 31 of the lower surface restraint surface 32 is preferably in the range of 90 ° or more and 170 ° or less. The inclination angle A is more preferably in the range of 100 ° or more and 130 ° or less. When such an inclination angle A is set, when the lower surface restraining surface 32 comes into contact with the lower surface 4 of the plate-like member 2, a restraining force directed toward the first side surface 7 is generated on the plate-like member 2. The stability which fixes the plate-shaped member 2 to the tool block 30 increases. In this embodiment, the inclination angle A of the lower surface restraint surface 32 with respect to the attachment reference surface 31 is about 115 °.

The tool block 30 further includes a side restraint surface 33 that contacts the first side surface 7 of the plate-like member 2. In this embodiment, the side restraint surface 33 has a two-stage structure. That is, the side restraint surface 33 has two contact portions, a first contact portion 34 and a second contact portion 35. The first contact portion 34 and the second contact portion 35 are arranged side by side in order from the lower surface restraint surface 32 side. The side restraint surface 33, the first contact portion 34, and the second contact portion 35 each extend in the longitudinal direction, and the cross-sectional shape orthogonal to the longitudinal direction is constant at any location in the longitudinal direction. It is formed as follows. Since the first side surface 7 of the plate-like member 2 is a curved surface, when the shape of the side restraint surface 33 is completely matched with the curved shape of the first side surface 7 of the plate-like member 2, various shapes are obtained. The tool block 30 cannot be used for the plate-like member. Further, it may be difficult in manufacturing to make the shape of the side restraint surface 33 of the tool block 30 completely coincide with the curved shape of the first side surface 7. Therefore, in this embodiment, the side restraint surface 33 has a two-stage structure, so that the first side surface 7 of the plate-like member 2 (in FIG. 2) and the side restraint surface 33 of the tool block 30 when viewed from the front. In this case, the same tool block 30 can be applied to the plate-like member having the first side face 7 having various radii of curvature. And the plate-like member 2 can be stably fixed to the tool block 30 by making the side restraint surface 33 into a two-stage structure. That is, since the side restraint surface 33 has the first contact portion 34 and the second contact portion 35, at least two places in the direction intersecting the first side surface 7 of the plate-like member 2 and the longitudinal direction. Contact. In addition, when the lower surface 4 and the lower surface restraining surface 32 are in contact with each other, the posture of the plate-like member 2 is stably determined by contact at three locations. Therefore, some difference in the radius of curvature of the first side surface 7 of the plate-like member 2 can be absorbed, and the fixation of the plate-like member 2 is very stable. In the present embodiment, the first contact portion 34 extends at an acute angle with respect to the lower surface restraint surface 32. In FIG. 10, the inclination angle of the first contact portion 34 with respect to the attachment reference surface 31 is smaller than the inclination angle A of the lower surface restraining surface 32 with respect to the attachment reference surface 31. Further, in FIG. 10, the inclination angle of the second contact portion 35 with respect to the attachment reference plane 31 is about 90 °, which is larger than the inclination angle of the first contact portion 34 with respect to the attachment reference plane 31.

The tool block 30 has a guide surface 36 that comes into contact with the clamp member 40 on an upper surface 30T at a position facing the attachment reference surface 31. The guide surface 36 of the upper surface 30T is substantially opposite to the lower surface restraint surface 32 with the side surface restraint surface 33 interposed therebetween.

The clamp member 40 is shown in FIG. 13 and FIG. The clamp member 40 is formed so that the cross-sectional shape orthogonal to the longitudinal direction is constant at an arbitrary position in the longitudinal direction as a whole. Each of the clamp members 40 has an upper surface 40T and a lower surface 40L extending in the longitudinal direction. In particular, the lower surface 40 </ b> L has a surface that contacts each of the plate-like member 2 and the tool block 30. As shown in FIGS. 13 and 14, the clamp member 40 includes an upper surface restraining surface 41 that contacts the upper surface 3 of the plate-like member 2 and a guided surface 42 that contacts the guide surface 36 of the tool block 30. 40L. The upper surface restraint surface 41 and the guided surface 42 are each formed so that the cross-sectional shape orthogonal to the longitudinal direction is constant at an arbitrary position in the longitudinal direction as a whole (excluding the location of the slit 40S). Has been.

The clamp member 40 is fixed (attached) to the tool block 30 by a fixing member 50 which is a fastening bolt here. By fastening the fixing member 50 to the screw hole 30H of the root block 30 through the stepped hole 40H, the clamp member 40 fixes the plate-like member 2 to the tool block 30 so as to fix the plate-like member 2 to the tool block 30. Can be held between. That is, the tool block 30 has a fixing means corresponding to the fixing member 50. That is, when the fixing member 50 is a tightening bolt, the tool block 30 has a screw hole 30H of a female screw corresponding to the male screw of the tightening bolt on the upper surface 30T. In the cutting tool 1 of this embodiment, as described above, the posture of the plate-like member 2 is stably determined by three-point contact (contact at three locations) with the tool block 30. Therefore, the plate-like member 2 is more firmly fixed to the tool block 30 by pressing the upper surface 3 of the plate-like member 2 with the upper surface restraining surface 41 of the clamp member 40. In this embodiment, the fixing member 50 is four fastening bolts. However, it is not limited to this. The fixing member 50 may be a single fastening bolt, or may be two, three, or five or more fastening bolts. Of course, fastening methods other than bolts may be employed.

The guide surface 36 of the tool block 30 is inclined with respect to the attachment reference surface 31 in substantially the same direction as the inclination direction of the lower surface restraint surface 32. Furthermore, the upper surface restraining surface 41 that comes into contact with the upper surface 3 of the plate-like member 2 is formed so as to be inclined in the direction opposite to the guided surface 42 in a plane orthogonal to the longitudinal direction. Therefore, the guide surface 36 is engaged with the guided surface 42 and the clamp member 40 is firmly attached to the tool block 30 by the fixing member 50, so that the guided surface within the plane orthogonal to the longitudinal direction of the clamp member 40 is obtained. The upper surface restraining surface 41 (inclined in the direction opposite to 42) can give the plate-like member 2 a force to be drawn toward the first side surface 7 of the plate-like member 2 through the upper surface 3. That is, the upper surface restraint surface 41 of the clamp member 40 can generate a force that presses the plate member 2 toward the side restraint surface 33 when contacting the upper surface 3 of the plate member 2. Due to the synergistic effect of these structures, the plate-like member 2 is fixed (held) to the tool block 30 very firmly. As a result, the clamp rigidity of the plate-like member 2 is increased, and the occurrence of chatter vibration is greatly suppressed. Therefore, the quality of the finished surface is greatly improved.

The clamp member 40 of this embodiment further has two slits 40S. Each slit 40S is formed in a direction orthogonal to the longitudinal direction. This slit is provided to promote elastic deformation of the clamp member 40. By providing the slit, the clamp member 40 is easily elastically deformed, and can come into close contact with the plate-like member 2 and the tool block 30 in a wider range. Therefore, the clamp of the plate-like member 2 is further stabilized. However, it is not limited to this. One slit or three or more slits may be provided. The slit may not be provided.

The plate-like member 2 has an elongated shape in the longitudinal direction, and is formed so that a cross-sectional shape in a direction orthogonal to the longitudinal direction is constant by a holding portion 2B extending in a predetermined range in the longitudinal direction. . The surfaces for holding the plate-like member 2 (that is, the lower surface restraint surface 32 and the side surface restraint surface 33 of the tool block 3 and the upper surface restraint surface 41 of the clamp member 40) also extend in the longitudinal direction. It is formed so that the cross-sectional shape in the direction orthogonal to the is constant. Therefore, it is easy to arbitrarily set the protrusion amount of the blade member 2A around the cutting edge 20E of the plate-like member 2 from the front surface 30F of the tool block 30 in the longitudinal direction. As described above, since the plate-like member 2 can be firmly attached to the tool block 30 using the clamp member 40 and the fixing member 50, even if the protrusion amount is relatively long, the plate It is possible to reduce the possibility of chatter vibration and the like occurring in the shaped member 2.

The plate member 2 and the tool block 30 may each include an engaging portion that engages with each other at a predetermined interval. For example, the protruding length of the plate-like member 2 may be adjusted stepwise by a method in which a convex portion is provided on one of the plate-like member 2 and the tool block 30 and a concave portion is provided on the other. Further, by providing marks such as scales on the plate-like member 2 and the tool block 30, it is possible to visually confirm the protruding length of the plate-like member 2 from the front surface 30F of the tool block 30 in the longitudinal direction. Still good. In addition, various conventional techniques for adjusting the protruding length of the plate-like member can be applied.

The cutting material of the cutting insert 20 or the plate-like member 2 and the tool material around the cutting blade are hard materials such as cemented carbide, cermet, ceramic, cubic boron nitride, or PVD or CVD coating film on the surface of these hard materials. It is preferable to select from those coated with diamond or diamond.

The plate-like member of this cutting tool can be used for cutting steel materials by being applied to various cutting tools and mounting the cutting tool on a machine tool. In particular, the plate-like member is applied to a lathe tool, a rotary cutting tool, and the like, and is effective when grooving an end surface of a workpiece. Although only the end face grooving cutting tool for lathes is described in the embodiment, the present invention can be applied to a rotary cutting tool called a trepanning tool. A trepanning tool is a rotary cutting tool for grooving or drilling.

The plate-like member, tool block, cutting tool, and the like of the cutting tool of the present invention are not limited to the above-described embodiment. Various modifications and additions can be made to the above embodiment without departing from the scope of the present invention. For example, the plate-like member 2 may be provided with a blade portion including a chip seat on the rear end surface side of the plate-like member. In this case, the cutting edge on the rear end face side may be a cutting edge that is different from the cutting edge on the front end face side.

The present invention includes all modifications, applications, and equivalents included in the concept of the present invention defined by the claims.

Claims

A plate-like member (2) in which at least one blade part (2A) and a holding part (2B) are positioned side by side along the longitudinal direction,
Two opposing side faces (7, 8), each of the two side faces (7, 8) extending in the longitudinal direction (LA), the first of the two side faces (7, 8) The side surface (7) is a curved surface that bulges outward, the side surface,
An upper surface (3) and a lower surface (4), the upper surface (3) and the lower surface (4) extending in the longitudinal direction between the two side surfaces, respectively, the upper surface (3) and the lower surface (4) 4) an upper surface and a lower surface, positioned on different sides of the first side surface (7);
Two end faces (5, 6), the two end faces (5, 6) extending between the two side surfaces and between the upper surface and the lower surface, respectively, and intersecting the longitudinal direction The two end faces (5, 6) are positioned on different sides of the first side face (7), and at least one end face (5 of the two end faces (5, 6)) ) Side of the blade portion is positioned,
At least one of the upper surface (3) and the lower surface (4) is a curved surface,
Plate member.
The plate-like member according to claim 1, wherein the holding portion (2B) has a constant cross-sectional shape perpendicular to the longitudinal direction in the longitudinal direction.
The plate-like member according to claim 1 or 2, wherein the blade portion has a tip seat (13), and a cutting insert (20) having a cutting edge is detachably attached to the tip seat.
The plate-like member according to claim 3, wherein the cutting insert (20) is fixed by elasticity around the tip seat (13).
The plate member according to claim 1 or 2, wherein the blade portion integrally includes a cutting blade.
The plate-like member according to any one of claims 1 to 5, wherein the second side surface (8) of the two side surfaces is a curved surface recessed inwardly.
The plate-like member according to any one of claims 1 to 6, wherein the upper surface (3) is a curved surface bulging outward.
The plate-like member according to any one of claims 1 to 7, wherein the lower surface (4) is a curved surface bulging outward.
The upper surface (3) has a curved shape along a part of the first virtual cylinder (C1) whose central axis extends in the longitudinal direction,
The lower surface (4) has a curved shape along a part of a second virtual cylinder (C2) whose central axis extends in the longitudinal direction.
The plate-like member according to claim 7 or 8.
A radius (Cr1) centered on the central axis (Ca1) of the first virtual cylinder (C1) is a radius (Cr2) centered on the central axis (Ca2) of the second virtual cylindrical shape (C2). The plate-like member according to claim 9, which is different.
The plate-like member according to any one of claims 1 to 10, wherein the plate-like member (2) is a cutting member for groove processing.
A tool block (30) for holding the plate-like member (2) according to any one of claims 1 to 11,
A tool block having a lower surface restraining surface (32) in contact with the lower surface (4) of the plate-like member (2).
And further comprising a side restraint surface (33) that contacts the first side surface (7) of the plate-like member (2),
The side restraint surface (33) has at least two contact portions (34, 35) that come into contact with the first side surface (7), and the at least two contact portions intersect with the longitudinal direction. Configured to contact at least two locations of the first side surface in a direction,
The tool block according to claim 12.
A holding device for holding the plate-like member (2) according to any one of claims 1 to 11,
A tool block (30) having at least a lower surface restraining surface (32) in contact with the lower surface (4) of the plate-like member (2);
A clamp member (40) configured to sandwich the plate-like member with the tool block (30) by the action of a fixing member (50), the clamp member (40) being the plate-like member And a clamping member (40) having an upper surface restraining surface (41) in contact with the upper surface (3).
A cutting tool comprising the plate-like member (2) according to any one of claims 1 to 11.