WO2013151137A1

WO2013151137A1 - Exchangeable tool edge cutting tool, and cutting insert and body for said tool

Info

Publication number: WO2013151137A1
Application number: PCT/JP2013/060341
Authority: WO
Inventors: 佐治　龍一
Original assignee: 株式会社タンガロイ
Priority date: 2012-04-04
Filing date: 2013-04-04
Publication date: 2013-10-10
Also published as: JPWO2013151137A1; JP5825429B2

Abstract

Provided is an exchangeable tool edge cutting tool in which a cutting insert can be fixed to the body without using a fastening member such as a screw. For this purpose, a fixing projection (12) is provided on the cutting insert (10) while an insert-fixing section (21) for installing the cutting insert (10) is formed on the body (20). The insert-fixing section (21) is provided with a fixing hole (22), which is for accepting the fixing projection (12) and fixing the cutting insert (10) at a specified rotational position that has the fixing projection (12) as the rotational axis, and rotation-preventing walls (23a, 23b), which are formed on the rotational path of the cutting insert (10), the rotational path having the fixing projection (12) as the rotational axis, to prevent rotation of the cutting insert (10) and lock same at the specified rotational position.

Description

Cutting edge exchangeable cutting tool, cutting insert and body for the tool

The present invention relates to a cutting edge exchangeable cutting tool, a cutting insert and a body for the tool, and is particularly suitable for application to a cutting edge exchangeable cutting tool for grooving.

As a conventional fluted cutting tool for exchanging grooving, there is a method of fixing the cutting insert to the body by inserting a screw from the side of the cutting insert as shown in Patent Document 1. In the cutting insert applied to such a method, since the screw is inserted from the side, the shape restriction on the rake face is reduced, and the rake face shape that allows smooth chip discharge can be designed. There is an advantage that you can.

Special table 2010-535638

In the cutting edge replacement type cutting tool represented by Patent Document 1 that is screwed from the side surface of the cutting insert, there may be a problem in operability when the cutting insert is attached or detached. That is, some of these grooving tools are small, and as a result, small screws are used, so the operator must perform the operation of attaching and detaching the cutting insert to the body using a small screwdriver, Complicated and cumbersome work. In addition, a small screw is highly likely to be lost, and if it is lost, the time for stopping the production machine may increase, leading to a decrease in production efficiency.

This invention solves said subject, and it aims at providing the structure which can attach or detach a cutting insert to a body by simple operation, without requiring a screw for fixation.

Therefore, in the first embodiment of the present invention, there is provided a cutting edge exchangeable cutting tool (A) comprising a cutting insert (10) and a body (20) for fixing the cutting insert (10),
A fixing protrusion (12) formed on one of the cutting insert (10) and the body (20);
An insert fixing part (21) formed on the other of the cutting insert (10) and the body (20) to fix the cutting insert (10);
With
The insert fixing part (21)
A fixing hole (22) for receiving the fixing protrusion (12) and fixing the cutting insert (10) at a predetermined rotational position with the fixing protrusion (12) as a rotation axis;
An anti-rotation wall (23a, 23b) formed on a rotation path of the cutting insert (10) with the fixing protrusion (12) as a rotation axis;
It is characterized by having.

In a 2nd form, it is a cutting insert (10) used for the said blade-tip-exchange-type cutting tool (A), Comprising: One of the said fixing projection part (12) and the said insert fixing | fixed part (21) was provided. Features.

In a 3rd form, it is a body (20) used for the said blade-tip-exchange-type cutting tool (A), Comprising: One of the said protrusion part (12) for fixing and the said insert fixing | fixed part (21) was provided. And

According to the present invention, the fixing projection (12) is provided on one of the cutting insert (10) and the body (20), and the other is the insert fixing portion (21) for attaching the cutting insert (10). A fixing for fixing the cutting insert (10) at a predetermined rotational position with the fixing protrusion (12) being received and receiving the fixing protrusion (12) in the insert fixing portion (21). An anti-rotation wall (23a) that is formed on the rotation path of the cutting insert (10) with the hole (22) and the fixing projection (12) as a rotation axis and that locks the cutting insert (10) at a predetermined rotational position. , 23b), the operator can fix the cutting insert to the body without using screws. Therefore, the convenience when the operator replaces the cutting insert is increased.

FIG. 1 is a perspective view of a blade-tip-exchangeable cutting tool according to an embodiment of the present invention. FIG. 2 is a perspective view showing the cutting edge replaceable cutting tool of FIG. 1 in a state where the cutting insert is separated from the body. FIG. 3 is a perspective view of a cutting insert used in the cutting edge-exchangeable cutting tool according to the embodiment of FIG. FIG. 4 is a front view of a cutting insert used for the cutting edge-exchangeable cutting tool according to the embodiment of FIG. FIG. 5 is a plan view of a cutting insert used for the cutting edge-exchangeable cutting tool according to the embodiment of FIG. FIG. 6 is a rear view of a cutting insert used in the cutting edge-exchangeable cutting tool according to the embodiment of FIG. FIG. 7 is an enlarged front view of a body used in the cutting edge replacement type cutting tool according to the embodiment of FIG. 1. FIG. 8 is a left side view of the body used in the cutting edge exchangeable cutting tool according to the embodiment of FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG. FIG. 10 is a cross-sectional view schematically showing a fixing hole and a fixing protrusion according to another embodiment of the present invention. FIG. 11A is a schematic cross-sectional view of a fixing hole and a fixing protrusion according to still another embodiment of the present invention. FIG. 11B is a three-side view of the fixing protrusion according to the embodiment shown in FIG. 11A. FIG. 11C is a schematic diagram for explaining the dimensions of each part of the fixing hole according to the embodiment shown in FIG. 11A. FIG. 12 is a cross-sectional view schematically showing a fixing hole and a fixing protrusion according to still another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described with reference to the drawings.

(Outline of the first embodiment)
First, with reference to FIG. 1 and FIG. 2, the technical idea that is the basis of the present invention will be described in accordance with the outline of the first embodiment. As shown in FIG. 1, the cutting edge exchange type cutting tool A of the present embodiment includes a cutting insert 10 and a body 20 for fixing the cutting insert 10. The part which becomes the characteristic of the blade-tip-exchange-type cutting tool A of this embodiment is as follows. As shown in FIG. 2, a fixing projection 12 is formed on one side surface 11 of the cutting insert 10. The cutting insert 10 is fixed to the body 20 by the fixing protrusion 12 being inserted into a fixing hole 22 formed in the bottom surface (the mounting surface of the cutting insert 10) of the insert fixing portion 21 provided in the body 20. The The inner diameter of the fixing hole 22 is slightly smaller than the outer diameter of the fixing protrusion 12, and the fixing hole 22 is inserted when the fixing protrusion 12 is inserted into the fixing hole 22 and an operation described later is performed. By tightening the fixing protrusion 12, the cutting insert 10 is prevented from coming off.

In addition, the insert fixing portion 21 is provided with

anti-rotation walls

23a and 23b for stopping the rotation of the cutting insert 10 around the insertion axis I shown in FIG. 21 is provided at two locations, that is, the proximal side, that is, the rear side and the distal side, that is, the front side. That is, as shown in FIG. 2, the insert fixing portion 21 is prevented from rotating against the cutting insert 10 on the side facing the rake face 14 on the cutting edge 13 side (the lower surface side of the cutting insert 10 in FIG. 2). An anti-rotation wall 23a that abuts the cutting insert 10 on the side (the upper surface side of the cutting insert 10 in FIG. 2) connected to the rake face 14 on the opposite side of the fixing hole 22 from the wall 23b and the cutting edge 13 side. And are provided. For this reason, even if cutting resistance is applied to the cutting insert 10 and the cutting insert 10 tries to rotate in the direction of the arrow R in FIG. 2, the

rotation preventing walls

23 a and 23 b come into contact with the cutting insert 10 to rotate the cutting insert 10. Is prevented.

Since the cutting edge replaceable cutting tool A according to the first embodiment of the present invention is composed of the cutting insert 10 and the body 20 as described above, when fixing the cutting insert to the body as in the prior art, a screw or the like No need for fasteners. By adopting such a configuration, according to the present invention, it is possible to simplify the replacement work of the cutting insert by the operator and also to reduce the management cost of the fastener and the fastening tool.

(Appearance shape)
Next, the shape and function of each member constituting the cutting edge exchange type cutting tool A according to the first embodiment will be described in more detail.

3 to 6 are views showing the cutting insert 10 from different directions. A cutting edge 13 is formed at the tip of the cutting insert 10. As shown in FIGS. 3 and 4, among the surfaces connected to the cutting edge 13, the surface 14 on the upper surface side functions as a rake surface, and the surface 15 on the distal end side of the cutting insert 10 and the side surface side connected to the surface. One side functions as a flank. As shown in FIG. 5, the surface 14 includes a step 14a and a curved surface 14b, which have a function of smoothly controlling the flow of chips.

As shown in FIG. 3, FIG. 5, and FIG. 6, the fixing projection 12 has an external shape obtained by cutting a cylinder having a diameter D1 along two parallel planes. That is, the fixing projection 12 has a substantially cylindrical shape in which a pair of curved side surfaces 12a1 and 12a2 facing each other and a pair of planar side surfaces 12b facing each other by connecting them are combined. A chamfer is applied to the intersection between the front end surface 12c and the curved side surfaces 12a1 and 12a2, and this facilitates the insertion of the fixing protrusion 12 into the fixing hole 22.

2 and 7, the body 20 includes an insert fixing portion 21 for attaching the cutting insert 10 to the side of the tip. The insert fixing portion 21 includes a placement portion 25 with which the side surface 11 of the cutting insert 10 abuts, and

anti-rotation walls

23a and 23b formed around the placement portion. In addition, the mounting part 25 refers not only to the part which directly contacts the cutting insert 10 but also to a group of surface areas including the part. The mounting portion 25 will be described in brief. The mounting portion 25 is a portion of the portion constituting the insert fixing portion 21 that faces or abuts the fixing protrusion 12 and the side surface 11 on which the fixing protrusion 12 is formed.

The mounting portion 25 is formed with a fixing hole 22 into which the fixing protrusion 12 of the cutting insert 10 is fitted. A chamfer 30 is provided on the periphery of the fixing hole 22. As shown in FIGS. 7 and 9, a pair of enlarged diameter portions 22 a 1 and 22 a 2 are formed adjacent to the fixing hole 22 so as to enlarge a part of the inner wall of the fixing hole 22. The enlarged diameter portions 22a1 and 22a2 are formed at symmetrical positions with the center of the fixing hole 22 in between. A length D2 between the enlarged diameter portion 22a1 and the enlarged diameter portion 22a2 with the center of the hole interposed therebetween is larger than the outermost diameter D1 of the fixing projection portion 12. Further, the width W2 of each of the enlarged diameter portions 22a1 and 22a2 is larger than the width W1 (see FIG. 6) of the curved side surfaces 12a1 and 12a2 of the fixing protrusion 12. Therefore, it is possible to smoothly insert the fixing protrusion 12 into the fixing hole 22 by setting the curved side surfaces 12a1 and 12a2 to the orientations aligned with the enlarged diameter portions 22a1 and 22a2. On the other hand, the inner diameter D3 of the fixing hole 22 is slightly smaller than the outermost diameter D1 of the fixing protrusion 12.

The insert fixing portion 21 includes

rotation prevention walls

23a and 23b for preventing the cutting insert 10 from rotating and locking at a predetermined rotational position as described above. The

rotation prevention walls

23 a and 23 b are respectively arranged on the rotation trajectories of the front end portion and the rear end portion of the cutting insert 10 in a state where the fixing protrusion 12 is inserted into the fixing hole 22. In particular, in the case of this embodiment, the two

anti-rotation walls

23 a and 23 b are formed at substantially rotationally symmetric positions around the fixing hole 22. Further, the contact surfaces 23a 'and 23b' of the two

anti-rotation walls

23a and 23b with the cutting insert 10 have substantially rotationally symmetric shapes around the fixing hole 22, as shown in FIGS. Have. Further, as shown in FIG. 8, the contact surfaces 23 a ′ and 23 b ′ are inclined toward the insertion direction of the fixing protrusion 12 with respect to the bottom surface of the insert fixing portion 21. In other words, when the body 20 is viewed from the front end side as shown in FIG. 8, the contact surfaces 23 a and 23 b of the rotation prevention wall are formed at an acute angle with respect to the mounting portion 25. Therefore, when the cutting insert 10 is placed on the mounting portion 25, the respective free end side edges of the contact surfaces 23a ′ and 23b ′ of the rotation prevention wall and the corresponding contact surfaces of the cutting insert 10 intersect at an acute angle. To do. That is, the

rotation prevention walls

23a and 23b and the cutting insert 10 are in a line contact state. By forming the

anti-rotation walls

23a and 23b as described above, the

anti-rotation walls

23a and 23b can effectively apply a force to press the cutting insert 10 against the bottom surface of the insert fixing portion 21, and the clamp. Power is improved.

(Cutting insert attachment / detachment operation)
When the cutting insert 10 is attached to the body 20 in the cutting edge replaceable tool A of the present embodiment, first, the tip portion of the cutting insert 10 protrudes upward from the insert fixing portion 21 from the posture corresponding to the time of fixing (FIG. 2). Further, the rear end portion is inclined so as to protrude downward, and the curved side surfaces 12a1 and 12a2 of the fixing projection 12 are aligned with the enlarged diameter portions 22a1 and 22a2 of the fixing hole 22, respectively.

Next, the curved side surfaces 12a1 and 12a2 are inserted into the fixing holes 22 of the fixing protrusions 12 along the enlarged diameter portions 22a1 and 22a2, respectively. Since the width W2 of the enlarged diameter portions 22a1 and 22a2 and the length D2 between the enlarged diameter portions are larger than the width W1 of the curved side surfaces 12a1 and 12a2 and the outermost diameter D1 of the fixing protrusion 12, the inner wall surface of the fixing hole 22 In addition, the fixing protrusion 12 can be smoothly inserted into the fixing hole 22 without being blocked by the enlarged diameter portions 22a1 and 22a2.

In this state, the cutting insert 10 is rotated so as to have a posture corresponding to that at the time of fixing, and the front end portion and the rear end portion are brought into contact with the

rotation prevention walls

23a and 23b. Since the outermost diameter D1 of the fixing protrusion 12 is larger than the inner diameter D3 of the fixing hole 22, the curved side surfaces 12a1 and 12a2 push the inner wall surface of the fixing hole 22, that is, the non-expanded diameter portion in the process of the rotation. The cutting insert 10 is fixed to the body 20 by the inner wall surface of the expanded fixing hole 22 tightening the fixing protrusion 12 by its elastic force. In the turning operation, the cutting insert 10 itself acts like a wrench, so that the operator can rotate the cutting insert 10 with only a small force and stabilize the cutting insert 10. It becomes possible to fix with a large force.

On the other hand, when the cutting insert 10 is removed from the body 20, the operation reverse to the above may be performed. That is, the cutting insert 10 may be rotated so that the curved side surfaces 12a1 and 12a2 face the enlarged diameter portions 22a1 and 22a2, and the cutting insert 10 is pulled out so that the fixing protrusion 12 is detached from the fixing hole 22. .

In this embodiment, the basic shape of the fixing protrusion 12, the number of curved side surfaces or planar side surfaces, and the facing state of the side surfaces are not limited to those described above, and the fixing hole 22 fixing protrusion 12. It is possible to adopt an appropriate configuration according to the configuration. However, considering the workability of the fixing protrusion 12 or the fixing hole 22 and the fact that a stable fixing force can be obtained, the above-described configuration is preferable.

(Other embodiments)
The present invention is not limited to the above embodiment. That is, according to the present invention, one of the cutting insert 10 and the body 20 includes the fixing protrusion 12, and the other includes the fixing hole 22 corresponding to the fixing protrusion 12, and the fixing protrusion 12 and the fixing hole 22 are provided. The technical idea of engaging and fixing the cutting insert 10 is also included. Therefore, for example, an embodiment in which the fixing protrusion is disposed in the body 20 and the fixing hole is disposed in the cutting insert 10 is also within the technical scope of the present invention.

Further, various modifications and additions of components can be made without departing from the technical idea of the present invention. For example, the following is an embodiment that is intended to effectively prevent the cutting insert 10 from coming out of the fixed hole 22.

FIG. 10 is a cross-sectional view schematically showing a fixing protrusion and a fixing hole in another embodiment of the present invention. In this embodiment, the hooked protrusion 24 formed on the wall at the back of the fixing hole 22 is hooked in the hooking hole 12d formed in the distal end surface 12c of the fixing protrusion 12. Thus, the cutting insert 10 is prevented from falling off.

Next, more specific shapes and functions of each part of this embodiment will be described. Two protrusions 24 are formed near the center of the bottom surface of the fixing hole 22. The protrusions 24 are formed to face each other with a gap therebetween, whereby the tip of the protrusion 24 can be bent toward the center of the fixing hole 22. At the tip of the protrusion 24, a flange 24a is formed projecting outward (outer peripheral side). The flange 24 a includes a slope 24 b, and the normal line of the slope 24 b extends in the direction of the opening of the fixing hole 22.

A latching hole 12d for receiving the projection 24 is formed from the distal end surface 12c of the fixing projection 12 of the cutting insert 10. A stepped portion 12e is formed at the entrance of the latching hole 12d, and the hooking portion 24a of the protruding portion 24 is engaged with the shoulder on the back side of the stepped portion 12e, so that the retaining function of the cutting insert 10 is enhanced.

Describing a specific engagement process, when the fixing protrusion 12 is inserted into the fixing hole 22, the front end surface 12c of the fixing protrusion 12 comes into contact with the inclined surface 24b of the flange 24a. Further, when the fixing protrusion 12 is pushed, the tip surface 12c of the fixing protrusion 12 applies a load while sliding on the inclined surface 24b, and elastically deforms the protrusion 24, thereby causing the two protrusions 24 to move to the center of the hole. To When the tip surface 12c of the fixing projection 12 reaches the bottom of the hole in this state, the applied load is removed, and the projection 24 returns to the original state again. At this time, the collar part 24a engages with the shoulder of the step part 12e.

11A to 11C show another embodiment of the present invention, FIG. 11A is a schematic cross-sectional view of a fixing hole and a fixing protrusion, FIG. 11B is a three-view diagram of the fixing protrusion, and FIG. 11C is a dimension of each part of the fixing hole. It is a schematic diagram for demonstrating. 11B and 11C, L1 is the inner diameter of the small-diameter portion 22b provided in the fixing hole 22, L2 is the length of the rod-like protrusion 12f provided in the fixing projection 12, and L3 is the small-diameter portion 22b of the fixing hole 22. The length between two enlarged-diameter portions 22a1 and 22a2 provided in FIG. Further, the relationship between the lengths of the respective parts is L3> L2> L1. In this embodiment, the fixing protrusion 12 is formed in a substantially T shape, and the cross-sectional shape of the fixing hole 22 is also formed in a substantially T shape. Then, when the cutting insert 10 is rotated and fixed, the rod-like protrusion 12 f at the tip of the fixing protrusion 12 enters the disc-shaped gap formed at the bottom of the fixing hole 22. The cutting insert 10 is prevented from coming off from the fixing hole 22.

Next, the specific shape and function of each part of this embodiment will be described. As shown in FIG. 11A, the fixing hole 22 of this embodiment includes a small diameter portion 22b that opens to the surface of the insert fixing portion 21, and a large diameter portion 22c that communicates with the small diameter portion 22b. The inner diameter of the large-diameter portion 22c is larger than that of the small-diameter portion 22b, so that the vertical cross-sectional shape of the fixing hole 22 is T-shaped. The small-diameter portion 22b includes two large-diameter portions 22a1 and 22a2, and these large-diameter portions communicate with the large-diameter portion 22c. As shown in FIG. 11B, a square columnar bar-shaped protrusion 12 f projects from the front end of the fixing protrusion 12 of this embodiment to the side of the fixing protrusion 12.

In this embodiment, when the cutting insert 10 is fixed to the body 20, the rod-like protrusion 12f is inserted into the fixing hole 22 along the enlarged diameter portions 22a1 and 22a2. If the cutting insert 10 is rotated after the rod-shaped protruding portion 12f comes into contact with the bottom of the hole, the rod-shaped protruding portion 12f enters the large-diameter portion 22c, and the cutting insert 10 is fixed to the body 20.

In addition, in this embodiment, although the rod-shaped protrusion part 12f was made into the square pillar shape, it can be made into a column shape and other appropriate shapes. That is, the cross-sectional shape of the rod-shaped protrusion 12f may be any. However, if the rod-like projecting portion 12f is a quadrangular prism shape, the rod-like projecting portion 12c and the inner wall of the large-diameter portion 22c are in surface contact when the cutting insert 10 is about to come out, so that the fixing force is greater than that in the case of line contact. Will increase.

FIG. 12 is a cross-sectional view schematically showing a fixing hole and a fixing protrusion according to still another embodiment of the present invention. In this embodiment, the key 22 d is accommodated inside the inner wall of the fixing hole 22, and when the fixing protrusion 12 is inserted into the fixing hole 22, the key 22 d slides down and the fixing protrusion 12 It fits in the key receiving hole 12g formed on the side surface. This prevents the cutting insert 10 from coming off from the fixing hole 22.

Next, specific shapes and functions of each part of this embodiment will be described. As shown in FIG. 12, the inner wall of the fixing hole 22 is formed with a key holding hole 22e that is inclined toward the hole bottom. The key holding hole 22e is formed longer than the length key 22d. The key 22d has an outer diameter that can move slidably in the key holding hole 22e. The fixing projection 12 is provided with a key receiving hole 12g on its side surface, and the key receiving hole 12g is formed when the fixing projection 12 is brought into contact with the bottom of the fixing hole 22 and rotated to the fixing position. The key holding hole 22e is formed at a position where the axis substantially coincides.

When the cutting insert 10 is fixed to the body 20, the body 20 is first tilted so that the bottom of the fixing hole 22 is positioned upward in the vertical direction. Then, the key 22d slides inside the key holding hole 22e and is completely accommodated therein. Next, the fixing projection 12 is inserted into the fixing hole 22 in this state. When the fixing protrusion 12 is completely inserted into the fixing hole 22, the cutting insert 10 is rotated to the fixing position and the body 20 is returned to the normal posture. As a result, the axis of the key receiving hole 12g and the key holding hole 22e coincide with each other, so that the key holding hole 22e slides out of the key 22d and is accommodated in the key receiving hole 12g. When removing the cutting insert 10 from the body 20, the key 22d is completely accommodated in the key holding hole 22e so that the bottom of the fixing hole 22 is positioned vertically upward, and the fixing protrusion 12 is not fixed. By turning to a position, the body 20 can be removed from the cutting insert 10.

In this embodiment, how many sets of the

key holding holes

22e, 22d, and key receiving holes 12g are provided, and how the interval between the holding holes 22e or the key receiving holes 12d when a plurality of sets are provided is set. These are not particularly limited, and can be appropriately changed depending on the use mode. In consideration of handling of the body 20 when the cutting insert 10 is not attached, a member that functions to prevent the key 22d from falling off the key holding hole 22e is provided, or the key 22d and / or the key The shape of the holding hole 22e can be determined appropriately.

In addition to the embodiments described above, various forms can be considered in the present invention. For example, as long as the anti-rotation wall functions to prevent the cutting insert 10 from rotating, its shape, number and location can be determined as appropriate. The shape of the cutting edge including the shape of the rake face and flank is not particularly limited. Therefore, the present invention can be applied to various cutting tools such as a turning tool and a drilling tool. The outer shape of the fixing projection 12 and the shape of the inner wall of the fixing hole 22 are tapered, that is, the shape in which the diameter of the cross section of the fixing projection 12 gradually increases from the tip surface toward the root. It is also possible to do. In this case, it is not necessary to rotate the cutting insert 10 for fixing, and the contact area between the fixing projection 12 and the fixing hole 22 is increased, so that the clamping force is improved.

The positions at which the enlarged diameter portions 22a1 and 22a2 are formed are not necessarily formed symmetrically with respect to the center of the fixing hole as in the above-described embodiment, and the portion corresponding to the shape of the fixing protrusion 12 What is necessary is just to form.

The dimension of the inner diameter of the fixing hole 22 is not necessarily smaller than the maximum diameter of the fixing protrusion 12 and may be the same size.

A Cutting edge replaceable cutting tool 10 Cutting insert 11 One side surface 12 of cutting insert Fixing protrusions 12a1 and 12a2 Curved side surface 12b Planar side surface

12c Tip surface

12d Stopping hole 12e Stepped portion 12f Rod-like protrusion 12g Key receiving hole 14 Surface 14a Step 14b Curved surface 15 Cutting insert front surface 20 Body 21 Insert fixing part 22 Fixing hole 22a1, 22a2 Expanded diameter part 22b Small diameter part 22c Large diameter part 22d Key 22e

Key holding hole

23a, 23b Anti-rotation wall 23a ' , 23b 'contact surface 24 projection 24a collar 24b slope 25 mounting part

Claims

A cutting edge exchangeable cutting tool (A) comprising a cutting insert (10) and a body (20) for fixing the cutting insert (10),
A fixing protrusion (12) formed on one of the cutting insert (10) and the body (20);
An insert fixing part (21) formed on the other of the cutting insert (10) and the body (20) to fix the cutting insert (10);
With
The insert fixing part (21)
A fixing hole (22) for receiving the fixing protrusion (12) and fixing the cutting insert (10) at a predetermined rotational position with the fixing protrusion (12) as a rotation axis;
An anti-rotation wall (23a, 23b) formed on a rotation path of the cutting insert (10) with the fixing protrusion (12) as a rotation axis;
A cutting edge exchangeable cutting tool (A) characterized by comprising:
The fixing protrusion (12) has a substantially cylindrical shape having a pair of curved side surfaces (12a1, 12a2) facing each other and a pair of planar side surfaces (12b) facing each other by connecting the two curved side surfaces. Have
In the fixing hole (22), a pair of enlarged diameter portions (22a1, 22a2) for partially expanding the inner diameter (D3) is formed corresponding to the pair of curved side surfaces (12a1, 12a2),
The inner diameter (D3) of the fixing hole (22) is the same as the outermost diameter (D1) formed by the pair of curved side surfaces (12a1, 12a2) of the fixing protrusion (12) or the outermost The cutting edge exchangeable cutting tool (A) according to claim 1, wherein the cutting tool (A) is smaller than the diameter (D1).
Two rotation prevention walls (23a, 23b) are formed at the position of the body (20) that is substantially rotationally symmetric about the fixing hole (22),
When the cutting insert (10) is in the predetermined rotational position, the contact surface with the cutting insert (10) in at least one of the two rotation prevention walls (23a, 23b) is the cutting insert (10). The cutting edge-replaceable cutting tool (A) according to claim 1 or 2, wherein an acute angle is formed with respect to a contact surface with the rotation prevention wall (23a, 23b).
4. The cutting edge-replaceable cutting tool according to claim 1, wherein the fixing protrusion has a shape in which a diameter of a cross section gradually increases from a tip toward a root. 5. A).
One or more protrusions (24) having a flange (24a) at the tip are provided inside the fixing hole (22),
The fixing protrusion (12) is formed with a retaining hole (12d) for receiving the protrusion (24),
A stepped portion (12e) for engaging the flange portion (24a) of the protrusion (24) is formed on the inner wall of the retaining hole (12d),
When the fixing protrusion (12) is received by the insert fixing portion (21), the protrusion (24) enters the retaining hole (12d) and the flange portion (24a) becomes the stepped portion. The cutting edge exchangeable cutting tool (A) according to any one of claims 1 to 4, wherein the cutting tool (A) is engaged with (12e).
A rod-like protrusion (12f) projecting sideways is formed at the tip so that the fixing protrusion (12) is substantially T-shaped in a side view,
The fixing hole (22) communicates with the small diameter portion (22b) and a small diameter portion (22b) opened on the surface of the insert fixing portion (21) so that the shape of the cross section in the axial direction is substantially T-shaped. A large-diameter portion (22c) having an inner diameter larger than that of the small-diameter portion (22b),
The small-diameter portion (22b) has an inner diameter (L1) smaller than the longitudinal dimension (L2) of the rod-shaped protrusion (12c) and has a longitudinal dimension for receiving the rod-shaped protrusion (12c). Having an enlarged diameter portion (22a1, 22a2) having a dimension (L3) larger than (L2),
The rod-shaped protrusion (12f) enters the large-diameter portion (22c) when the cutting insert (10) is attached to the body (20). The blade-tip-exchangeable cutting tool (A) according to Item.
A key holding hole (22e) inclined toward the hole bottom is formed on the inner wall surface of the fixing hole (22),
A key (22d) is slidably inserted into the key holding hole (22e),
A key receiving hole (12g) for receiving a part of the key (22d) is inclined on the side surface of the fixing protrusion (12) toward the tip of the fixing protrusion (12). The cutting edge exchangeable cutting tool (A) according to any one of claims 1 to 6, wherein the cutting tool (A) is formed.
It is a cutting insert (10) used for the blade-tip-exchange-type cutting tool (A) according to any one of claims 1 to 7, wherein the fixing protrusion (12) and the insert fixing portion (21) Cutting insert (10) characterized in that it comprises one.
It is a body (20) used for the blade-tip-exchange-type cutting tool (A) according to any one of claims 1 to 7, wherein one of the fixing protrusion (12) and the insert fixing portion (21). A body (20) characterized by comprising: