JP2015150659A - Tip replacement type grooving tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tip replacement type grooving tool which can stably clamp a cutting insert and may have an increased clamp strength.SOLUTION: A tip replacement type grooving tool is characterized in that the tool includes: insert holding member 2; a cutting insert 4 which projects a cutting edge 4a in a grooving direction La from an end part of the insert holding member 2 and is detachably attached to an insert installation seat 3 of the insert holding member 2; a presser member 5 which is independent of the insert holding member 2, is so disposed as to face the insert holding member 2 from above a height direction H among directions orthogonal to the grooving direction La, and holds the cutting insert 4 between the insert holding member 2 and itself; and a clamp member 6 which holds the insert holding member 2 and the presser member 5, and so moves these members to approach the height direction H.

Description

  The present invention relates to a blade-exchange-type grooving tool for grooving or parting off a work material.

Conventionally, a work piece made of a columnar or cylindrical metal material is rotated around its axis, and the cutting edge of the cutting insert is applied to the outer peripheral surface or inner peripheral surface of the work material or the end face facing the axial direction. 2. Description of the Related Art A blade exchange type grooving tool that performs grooving or parting off is known.
For example, the cutting edge-replaceable grooving tool described in the following Patent Documents 1 and 2 has a rectangular plate-shaped insert holding member and a cutting edge protruding in the grooving direction from the longitudinal end of the insert holding member. And a cutting insert that is detachably mounted on the insert mounting seat of the insert holding member, and the cutting insert is inserted between the upper jaw portion and the lower jaw portion of the insert holding member, and the upper jaw portion Is clamped by being elastically deformed.

Japanese Patent No. 2902206 Japanese Patent No. 4870753

However, the conventional cutting edge exchange type grooving tool has the following problems.
That is, when the cutting insert is attached to and detached from the insert holding member, the cutting insert may be rubbed against the upper jaw portion and the lower jaw portion of the insert holding member. In this case, the upper insert portion and the lower jaw portion wear and the cutting insert is worn. There was a possibility that the mounting stability of was damaged.
Moreover, in the clamp by elastic deformation mentioned above, since an upper jaw part rotates and contacts a cutting insert, there exists a possibility that the contact area of an upper jaw part and a cutting insert cannot fully be ensured, and the clamp strength of a cutting insert improves. There was room for improvement.

  This invention is made in view of such a situation, Comprising: It aims at providing the cutting edge exchange-type grooving tool which can clamp a cutting insert stably and can improve clamp strength. It is said.

In order to solve such problems and achieve the above object, the present invention proposes the following means.
That is, the cutting edge replaceable grooving tool of the present invention has an insert holding member and a cutting blade protruding from the end of the insert holding member in the grooving direction, and is detachably mounted on the insert mounting seat of the insert holding member. The insert holding member is separated from the insert holding member, and is disposed opposite to the insert holding member from above in the height direction among the directions orthogonal to the grooving direction, and the insert holding member And a clamp member for holding the insert holding member and the pressing member and moving them close to each other in the height direction.

According to the cutting edge replaceable grooving tool according to the present invention, the cutting insert is clamped between the insert holding member and the pressing member which are clamped between the insert holding member and the pressing member which are separated from each other. It is clamped by being moved closer by the member.
As described above, since the insert holding member and the pressing member are separated, the insert mounting seat is opened by separating the pressing member from the insert mounting seat of the insert holding member. The cutting insert can be attached to or removed from the tool. Therefore, when the cutting insert is attached to and detached from the insert holding member, the cutting insert can be prevented from being rubbed against the insert holding member and the pressing member, and wear of the insert holding member and the pressing member can be suppressed. It is possible to maintain the mounting stability of the cutting insert well.

  In addition, since the insert holding member and the pressing member are separated, when the clamp member is moved in the height direction, not only the adhesion between the cutting insert and the insert holding member but also the cutting insert It is possible to ensure sufficient adhesion between the pressing member and a contact area for clamping the cutting insert.

  As described above, according to the present invention, the cutting insert can be clamped stably and the clamping strength can be increased.

  Further, in the cutting edge replaceable grooving tool of the present invention, the insert holding member is formed with a first inclined surface that gradually extends downward in the height direction toward the grooving direction. A second inclined surface that gradually extends downward in the height direction as it goes in the grooving direction is formed in a portion facing the first inclined surface, and the insert holding member and the pressing member are formed by the clamp member. And the first inclined surface and the second inclined surface are in sliding contact with each other while the pressing member moves in the grooving direction with respect to the insert holding member. It may be possible.

  In this case, when the insert holding member and the pressing member are moved close to each other in the height direction by the clamp member, the pressing member is pressed against the insert holding member by the sliding contact between the first and second inclined surfaces. It can also be moved in the grooving direction. As described above, the insert holding member and the pressing member relatively move in the height direction and the grooving direction, so that the cutting insert can be clamped not only in the height direction but also in the grooving direction. Thus, the clamping strength of the cutting insert can be remarkably increased.

  Further, in the cutting edge exchange type grooving tool of the present invention, the insert holding member and the pressing member may be connected to each other by a structure in which the insert holding member and the pressing member are prevented from being detached from each other in a direction away from the height direction.

  In this case, although the insert holding member and the pressing member are formed separately, they are connected to each other by a retaining structure, so that the ease of handling can be improved and the detachability of the cutting insert can be improved. Can be increased.

  Further, in the cutting edge replaceable grooving tool of the present invention, the insert mounting seat is 180 around the center axis of the insert holding member along the width direction perpendicular to the grooving direction and the height direction of the insert holding member. A pair may be formed at a rotationally symmetric position.

  In this case, a pair of insert mounting seats for mounting the cutting inserts are provided at positions that are 180 ° rotationally symmetric about the central axis along the width direction of the insert holding member. In this case, a new unused insert mounting seat can be used in place of the old insert mounting seat that has been used and no sufficient insert mounting accuracy can be obtained, thereby doubling (extending) the tool life. it can. In addition, when these insert mounting seats have different shapes, a plurality of types of cutting inserts can be attached to the cutting edge exchange type grooving tool, so that various cutting processes can be easily handled.

  According to the blade exchange type grooving tool of the present invention, the cutting insert can be clamped stably and the clamping strength can be increased.

It is a perspective view which shows the blade-tip-exchange-type grooving tool which concerns on one Embodiment of this invention. It is a disassembled perspective view of the blade-tip-exchange-type grooving tool which concerns on one Embodiment of this invention. It is the top view which looked at the blade-tip-exchange-type grooving tool from the upper direction of (a) height direction, (b) The side view seen from the width direction. It is the front view which looked at the blade-tip-exchange-type grooving tool from the grooving direction. (A) The figure showing the AA cross section of FIG. 3, (b) It is a figure showing the state which removed the cutting insert of (a). It is a figure showing the BB cross section of FIG. It is an enlarged view of the C section of FIG. It is a figure explaining the clamped state of a blade-tip-exchange-type grooving tool.

DESCRIPTION OF EMBODIMENTS Hereinafter, a blade edge replacement grooving tool 1 according to an embodiment of the present invention will be described with reference to the drawings.
The cutting edge replacement type grooving tool 1 of the present embodiment rotates a work material made of a columnar or cylindrical metal material around its axis, and changes the outer peripheral surface, inner peripheral surface, or axial direction of the work material. The facing end face or the like is subjected to grooving with the cutting edge 4a of the cutting insert 4 or parting off.

  As shown in FIG. 1 to FIG. 4, the cutting edge replaceable grooving tool 1 has an insert holding member 2 and a cutting edge 4 a protruding from the end of the insert holding member 2 in the grooving direction La to hold the insert. The cutting insert 4 that is detachably mounted on the insert mounting seat 3 of the member 2 and the insert holding member 2 are separated from each other, and this insert from above in the height direction H in the direction orthogonal to the grooving direction La. The holding member 2 is disposed so as to face the holding member 2, holds the cutting insert 4 with the insert holding member 2, holds the insert holding member 2 and the holding member 5, and holds them together in the height direction H And a clamp member 6 that is moved close to.

  The insert holding member 2 has a rectangular plate shape, and a cutting edge 4a of the cutting insert 4 is projected from an end portion along the longitudinal direction. The insert holding member 2 is disposed so that the longitudinal direction of the pair of rectangular surfaces (side surfaces 10) facing the thickness direction is along the horizontal direction, and the short direction of the rectangular surface is along the vertical direction. In this state, it is mounted on a machine tool (not shown) via the clamp member 6.

Here, in this specification, the direction along the longitudinal direction of the insert holding member 2 is referred to as the front-rear direction L, and in the front-rear direction L, the direction in which the cutting edge 4a of the cutting insert 4 is projected from the insert holding member 2 is a groove. It is referred to as the insertion direction La or the front. Of the front and rear direction L, the direction toward the opposite side to the grooving direction La is referred to as the rear.
Of the directions orthogonal to the front-rear direction L (grooving direction La), the direction along the short direction of the rectangular surface (side surface 10) of the insert holding member 2 is referred to as a height direction H. The direction along the thickness direction is referred to as the width direction W. Here, the insert holding member 2 and the pressing member 5 are lined up in the height direction H and held by the clamp member 6, and the pressing member 5 is disposed with respect to the insert holding member 2 in the height direction H. The direction in which the insert holding member 2 is disposed with respect to the pressing member 5 is referred to as the downward direction.
The front-rear direction L, the height direction H, and the width direction W are orthogonal to each other.

  A pair of insert mounting seats 3 are formed at both ends in the front-rear direction L of the insert holding member 2. Specifically, as shown in FIG. 3B, the insert mounting seat 3 extends around the central axis O of the insert holding member 2 extending in the width direction W (that is, along the width direction W) in the insert holding member 2. A pair is formed at a position that is 180 ° rotationally symmetric. The insert mounting seats 3 have the same shape.

  In the present embodiment, the insert holding member 2 has a 180 ° rotationally symmetric shape around the central axis O. However, the present invention is not limited to this. For example, only one insert mounting seat 3 may be formed at the front end portion (end portion in the grooving direction La) along the front-rear direction L of the insert holding member 2. In addition, in this specification, the insert mounting seat 3 arrange | positioned at this front-end part is demonstrated, and the description is abbreviate | omitted about the insert mounting seat 3 arrange | positioned at a rear-end part.

As shown in FIG. 8, the insert mounting seat 3 is disposed at the end (upper end) in the height direction H at the end (front end) in the front-rear direction L of the insert holding member 2. The insert mounting seat 3 is a notch-shaped recess that opens upward in the height direction H and on both sides in the width direction W, and has a front wall 3a, a rear wall 3b, and a bottom wall 3c. doing. In the example shown in the drawing, concave thin portions are respectively formed in the connecting portion between the front wall 3a and the bottom wall 3c and the connecting portion between the bottom wall 3c and the rear wall 3b.
In a cross-sectional view perpendicular to the front-rear direction L shown in FIGS. 5A and 5B, the bottom wall 3c has a V-shape that protrudes upward.

  As shown in FIGS. 2, 3 (b) and 8, the insert holding member 2 is formed with a first inclined surface 11 extending gradually downward in the height direction H toward the grooving direction La. ing. The first inclined surface 11 is disposed adjacent to the rear of the insert mounting seat 3 on the surface (upper surface) 8 facing upward in the height direction H of the insert holding member 2, and the front end portion of the first inclined surface 11. Is connected to the rear wall 3 b of the insert mounting seat 3.

In FIG. 3 (b), the first inclined surface 11 is 180 around the central axis O of the insert holding member 2 corresponding to the fact that the insert holding member 2 has a vertically inverted symmetrical shape around the central axis O. A pair is formed at a rotationally symmetrical position. The first inclined surfaces 11 have the same shape.
As described above, when only one insert mounting seat 3 is formed on the insert holding member 2, only one first inclined surface 11 is formed correspondingly.

  In the example shown in FIG. 3B, the first inclined surface 11 is formed over approximately half of the total length along the front-rear direction L of the upper surface 8 of the insert holding member 2. Further, portions of the upper surface 8 of the insert holding member 2 other than portions corresponding to the insert mounting seat 3 and the first inclined surface 11 are directed upward in the height direction H in a cross-sectional view perpendicular to the front-rear direction L. A convex V-shape is formed (see FIG. 2).

  As shown in FIG. 2, FIG. 5B, FIG. 6, and FIG. 7, the first inclined surface 11 is recessed downward from the first inclined surface 11 in the height direction H. A guide groove 7 extending along the extending direction of the inclined surface 11 (extending along the front-rear direction L) is formed. The front end portion of the guide groove 7 is opened in the rear wall 3 b of the insert mounting seat 3, and the rear end portion of the guide groove 7 is opened in the upper surface 8 of the insert holding member 2.

  In FIG. 7, the size (groove width) along the width direction W of the guide groove 7 is larger at the portion other than the upper end portion as compared with the upper end portion opened to the first inclined surface 11. In the illustrated example, the groove width of the guide groove 7 is gradually increased from the upper end portion toward the lower end portion, and is largest at the groove bottom.

In a cross-sectional view perpendicular to the front-rear direction L shown in FIG. 5B, the surface (lower surface) 9 facing downward in the height direction H of the insert holding member 2 has a V-shape that protrudes downward. ing. Specifically, in the lower surface 9 of the insert holding member 2, a portion other than the portion corresponding to the insert mounting seat 3 and the first inclined surface 11 has a convex V shape in cross section.
In addition, the pair of side surfaces 10 facing the width direction W of the insert holding member 2 each have a rectangular planar shape perpendicular to the width direction W.

  The cutting insert 4 is made of a hard material such as a cemented carbide. As shown in FIG. 8, the cutting insert 4 includes a clamped portion 13 that is clamped between the insert holding member 2 and the pressing member 5, and a cut that protrudes from the clamped portion 13 toward at least the grooving direction La. A blade portion 14 having a blade 4a.

  The clamped portion 13 has a rectangular plate shape or a rectangular parallelepiped shape, and has a front surface 13a, a rear surface 13b, a lower surface 13c, an upper surface 13d, and a pair of side surfaces 13e. In a state where the cutting insert 4 is attached to the insert mounting seat 3, the front surface 13a, the rear surface 13b, and the lower surface 13c of the clamped portion 13 are disposed to face the front wall 3a, the rear wall 3b, and the bottom wall 3c of the insert mounting seat 3, respectively. Is done.

  5A and 5B, the lower surface 13c of the clamped portion 13 is formed in a V-shape that becomes concave upward in the height direction H in a cross-sectional view perpendicular to the front-rear direction L shown in FIGS. ing. Specifically, the lower surface 13c of the clamped portion 13 is formed in a concave V shape corresponding to the convex V shape of the bottom wall 3c of the insert mounting seat 3, and the lower surface 13c and the bottom wall 3c Are engaged with each other, the movement of the cutting insert 4 relative to the insert mounting seat 3 in at least the width direction W is restricted.

Further, in this cross-sectional view, the upper surface 13d of the clamped portion 13 is formed in a V-shape that becomes concave downward in the height direction H.
In the illustrated example, the size along the width direction W of the clamped portion 13 of the cutting insert 4 is larger than the size along the width direction W of the insert mounting seat 3 of the insert holding member 2.

In FIG. 8, the blade portion 14 protrudes forward from the front surface 13a of the clamped portion 13 and protrudes upward from the upper surface 13d, and the blade portion 14 as a whole has a rectangular plate shape or a rectangular parallelepiped shape. ing.
On the upper end surface of the blade portion 14, a U-shaped or U-shaped cutting blade 4a that opens rearward is formed. Specifically, the cutting edge 4a is located at the front edge of the upper end surface of the blade portion 14 and extends along the width direction W, and on both side edges of the upper end surface of the blade portion 14 in the width direction W. A pair of side cutting edges that are positioned and extend along the front-rear direction L, and the front ends of the pair of side cutting edges are connected to both ends of the front cutting edge.

  Of the upper end surface of the blade portion 14, a portion that continues to the rear of the front cutting edge and a portion that continues to the inside of the pair of side cutting edges in the width direction W are rake faces. Moreover, the part which continues below the cutting blade 4a among the front surface and a pair of side surface of the blade part 14 is made into the flank.

In FIG. 4, the size along the width direction W of the blade portion 14 is the same as the size along the width direction W of the clamped portion 13 at a portion other than the upper end portion along the height direction H, and the height direction. The upper end portion of H is gradually increased in the upward direction, and has the maximum width at the cutting edge 4a (a pair of side cutting edges) located at the upper end edge.
Further, in FIG. 8, the front surface of the blade portion 14 is located in front of the front surface of the insert holding member 2 (grooving direction La). The front surface of the blade portion 14 is gradually inclined forward as it goes upward in the height direction H, and protrudes most forward in the cutting edge 4a (front cutting edge) located at the upper edge.

As shown in FIGS. 2 and 8, the pressing member 5 has an elongated plate shape in which the size (height) in the height direction H gradually decreases as it goes rearward along the front-rear direction L.
A step portion 15 is formed at the lower end portion of the front end portion of the pressing member 5 so as to be cut out in a rectangular shape in a side view of the pressing member 5 shown in FIG. The step portion 15 has a rear wall 15 b disposed to face the rear surface 13 b of the clamped portion 13 of the cutting insert 4 and a top wall 15 d disposed to face the upper surface 13 d of the clamped portion 13.

  5A and 5B, the top wall 15d of the step portion 15 of the pressing member 5 has a V-shape that protrudes downward in the height direction H. It is formed in a shape. Specifically, the top wall 15d of the step portion 15 is formed in a convex V shape in cross section corresponding to the concave V shape in the upper surface 13d of the clamped portion 13 of the cutting insert 4, and the top wall 15d When the upper surface 13d is engaged with each other, the movement of the cutting insert 4 relative to the pressing member 5 in at least the width direction W is restricted.

Further, in this cross-sectional view, the surface (upper surface) 16 facing upward in the height direction H of the pressing member 5 is formed in a V-shape that is convex upward.
In the illustrated example, the size (width) along the width direction W of the pressing member 5 is equivalent to the size (width) along the width direction W of the insert holding member 2. The pair of side surfaces facing W are flush with the pair of side surfaces 10 of the insert holding member 2.
In FIG. 8, the front surface of the pressing member 5 is located above the clamped portion 13 of the cutting insert 4 and is disposed behind the blade portion 14, and gradually increases in the height direction H. Inclined backwards.

  Further, in the holding member 5, a second inclined surface 12 that gradually extends downward in the height direction H as it goes in the grooving direction La is formed in a portion of the insert holding member 2 that faces the first inclined surface 11. ing. The displacement amount in the height direction H per unit length along the front-rear direction L in the second inclined surface 12 (that is, the inclination of the second inclined surface 12) is the displacement amount (first inclination of the first inclined surface 11). The first inclined surface 11 and the second inclined surface 12 are slid along the extending direction over substantially the entire area in the extending direction of the inclined surfaces 11 and 12. Abuts in a movable manner.

  As shown in FIG. 2, FIG. 3B and FIG. 8, the second inclined surface 12 is adjacent to the rear of the step portion 15 on the surface (lower surface) facing downward in the height direction H of the pressing member 5. The front end portion of the second inclined surface 12 is continuous with the rear wall 15b of the step portion 15.

In the example shown in FIG. 3B, the second inclined surface 12 is formed over the entire region other than the step portion 15 in the entire length along the front-rear direction L of the lower surface of the pressing member 5.
As shown in FIGS. 5B, 6, and 7, the second inclined surface 12 protrudes downward in the height direction H from the second inclined surface 12, and the second inclined surface. Guide ribs 17 extending along the extending direction of 12 (extending along the front-rear direction L) are formed. The guide rib 17 is inserted into the guide groove 7 of the insert holding member 2.

In FIG. 7, the size (rib width) along the width direction W of the guide rib 17 is larger at the portion other than the upper end portion as compared with the upper end portion connected to the second inclined surface 12. In the illustrated example, the rib width of the guide rib 17 is gradually increased from the upper end to the lower end, and is the largest at the lower end.
Further, the rib width at the upper end portion of the guide rib 17 corresponds to the groove width at the upper end portion of the guide groove 7 of the insert holding member 2, and this is directed in the width direction W of the pressing member 5 with respect to the insert holding member 2. Movement is restricted. Further, the rib width in the portion other than the upper end portion of the guide rib 17 is made smaller than the groove width in the portion other than the upper end portion of the guide groove 7 of the insert holding member 2.

  In addition, the size along the height direction H of the guide rib 17 (projection height from the second inclined surface 12) is the size along the height direction H of the guide groove 7 (the depth recessed from the first inclined surface 11). Thus, the first and second inclined surfaces 11 and 12 are reliably brought into contact with each other in the height direction H in a state where the guide rib 17 is inserted into the guide groove 7. It is like that.

Then, the guide ribs 17 whose rib width increases toward the lower end are inserted into the guide grooves 7 whose groove width increases toward the groove bottom in this manner, and these engage with each other, thereby holding the insert. The member 2 and the pressing member 5 are connected to each other by a structure in which the member 2 and the pressing member 5 are prevented from being detached from each other in the height direction H (that is, the insert holding member 2 and the pressing member 5 are separated from each other in the height direction H). Disengagement) is impossible to engage).
Further, the front end portion of the guide rib 17 faces the rear surface 13b of the clamped portion 13 of the cutting insert 4 so as to face the insert mounting seat 3 (see FIG. 8). In addition, the front end part of the guide rib 17 may be arrange | positioned back rather than the rear wall 15b of the step part 15. FIG.

As shown in FIGS. 1 to 4 and 6, the clamp member 6 includes a tool block 18 that is a main body of the clamp member 6 and has a rectangular parallelepiped shape, and a clamp screw 19 that is screwed to the tool block 18. And a wedge body 20 that is movable with respect to the tool block 18 along the screw shaft (screw center axis) direction of the clamp screw 19 in accordance with the screwing amount of the clamp screw 19.
A plurality of clamp screws 19 and wedge bodies 20 are arranged on the tool block 18 at intervals in the front-rear direction L.

  An accommodation groove 21 that can accommodate the insert holding member 2 and the pressing member 5 is formed extending in the front-rear direction L on one side surface of both side surfaces facing the width direction W in the tool block 18. The housing groove 21 penetrates the tool block 18 in the front-rear direction L, and is open on both end faces of the tool block 18 facing the front-rear direction L.

The housing groove 21 has a side wall 21a facing in the width direction W, a top wall 21b that continues to the upper end of the side wall 21a and faces downward, and a bottom wall 21c that continues to the lower end of the side wall 21a and faces upward.
The side wall 21 a has a planar shape perpendicular to the width direction W, and is in contact with the side surface 10 of the insert holding member 2 and the side surface of the pressing member 5.
The top wall 21b has a planar shape perpendicular to the height direction H. The top wall 21b is spaced from the upper surface 8 of the insert holding member 2 and the upper surface 16 of the pressing member 5 with a slight space therebetween. Opposed.
The bottom wall 21c is gradually inclined upward in the height direction H as it is separated from the side wall 21a along the width direction W, and the bottom wall 21c is a pair constituting the lower surface 9 having a V-shaped cross section of the insert holding member 2. Of the inclined surfaces, the abutted surface is brought into contact with one inclined surface located on the opposite side to the side wall 21a.

  A plurality of concave portions 22 are formed at the upper end portion of the tool block 18 at intervals in the front-rear direction L. The wedge bodies 20 are accommodated in the recesses 22, respectively. In FIG. 6, a female screw hole is formed in the bottom surface of the recess 22. The screw shaft of the female screw hole has a side wall 21a out of a pair of inclined surfaces constituting the upper surface 16 (the upper surface 8 having the convex V shape of the cross section of the insert holding member 2) of the pressing member 5 having the convex V shape of the cross section. Extends perpendicular to one inclined surface located on the opposite side.

  The clamp screw 19 includes a pair of male screw portions at different pitches or different screw directions at both ends (upper and lower ends) along the screw shaft. Of the pair of male screw portions of the clamp screw 19, the male screw portion provided at the lower end (lower portion) is screwed into the female screw hole of the recess 22 of the tool block 18.

  The wedge body 20 is formed with a female screw hole that is screwed into a male screw portion provided at an upper end portion (upper portion) of the pair of male screw portions of the clamp screw 19. In addition, the lower surface 20a of the wedge body 20 has a planar shape perpendicular to the screw shaft of the female screw hole, and the upper surface 16 having a convex V shape in cross section of the pressing member 5 (the convex convex shape in cross section of the insert holding member 2). Of the pair of inclined surfaces constituting the upper surface 8) having a shape, the upper surface 8 is brought into contact with one inclined surface located on the side opposite to the side wall 21a.

Next, a procedure for mounting the cutting insert 4 in the cutting edge replaceable grooving tool 1 having such a configuration will be described.
First, the insert mounting seat 3 is opened by separating the pressing member 5 from the insert mounting seat 3 of the insert holding member 2. Specifically, for example, the pressing member 5 is moved backward with respect to the insert holding member 2 while sliding the first and second inclined surfaces 11 and 12 along the extending direction of the inclined surfaces 11 and 12. The step portion 15 of the pressing member 5 is retracted from the insert mounting seat 3 by sliding and moving. And the cutting insert 4 is attached with respect to the insert mounting seat 3 made into the open state.

  After the cutting insert 4 is mounted on the insert mounting seat 3, the pressing member 5 is slid forward with respect to the insert holding member 2, and the step portion 15 of the pressing member 5 is moved onto the clamped portion 13 of the cutting insert 4. To place.

  Next, in FIG. 6, the wedge body 20 is moved closer to the insert holding member 2 along the screw axis direction of the clamp screw 19 by rotating the clamp screw 19 around the screw axis. Thereby, the upper surface 16 of the pressing member 5 and the upper surface 8 of the insert holding member 2 that are in contact with the lower surface 20 a of the wedge body 20 are pressed by a force F along the screw shaft direction of the clamp screw 19.

A force F generated by operating the clamp screw 19 positioned on the pressing member 5 among the plurality of clamp screws 19 is perpendicular to the first and second inclined surfaces 11 and 12 as shown in FIG. A large component force f1 and a parallel component force f2 are generated. The component force f1 acts so as to move the pressing member 5 closer to the insert holding member 2 in the height direction H, and the first and second inclined surfaces 11 and 12 are reliably brought into contact with each other (adhesion). To do). Further, the component force f <b> 2 acts to slide the pressing member 5 forward with respect to the insert holding member 2 along the direction in which the first and second inclined surfaces 11 and 12 extend.
That is, when the insert holding member 2 and the pressing member 5 are moved close to each other in the height direction H by the clamp member 6, the first inclined surface 11 and the second inclined surface 12 are in sliding contact with each other, and the insert holding member. 2, the pressing member 5 can also move in the grooving direction La.

Thereby, the cutting insert 4 is clamped from the height direction H and the front-back direction L between the step part 15 of the pressing member 5 and the insert mounting seat 3 of the insert holding member 2.
Specifically, the rear wall 15 b of the step portion 15 of the pressing member 5 abuts on the rear surface 13 b of the clamped portion 13 of the cutting insert 4, and the front surface 13 a of the clamped portion 13 is the front wall 3 a of the insert mounting seat 3. The cutting insert 4 is clamped from the front-rear direction L in a state in which the cutting insert 4 is in contact. Further, the top wall 15 d of the step portion 15 of the pressing member 5 contacts the upper surface 13 d of the clamped portion 13 of the cutting insert 4, and the lower surface 13 c of the clamped portion 13 contacts the bottom wall 3 c of the insert mounting seat 3. In this state, the cutting insert 4 is clamped from the height direction H.

  At this time, as shown in FIG. 5A, the upper surface 13d having a concave V-shaped section in the clamped portion 13 of the cutting insert 4 and the top wall having a convex V-shaped section in the step portion 15 of the pressing member 5 are used. 15d are aligned in the width direction W while being in sliding contact with each other, and the lower surface 13c having a concave V-shaped section in the clamped portion 13 of the cutting insert 4 and the convex section V in the insert mounting seat 3 of the insert holding member 2 are provided. The insert holding member 2, the cutting insert 4, and the pressing member 5 are aligned with each other at the center positions along the width direction W by being aligned with each other in the width direction W while being in sliding contact with each other. They will be positioned and clamped to match.

  On the other hand, in order to remove the cutting insert 4 attached to the cutting edge-replaceable grooving tool 1, a procedure reverse to the attaching procedure described above may be performed.

According to the cutting edge replacement type grooving tool 1 of the present embodiment described above, the cutting insert 4 is held between the insert holding member 2 and the pressing member 5 which are separated from each other, and these insert holding members are held. The member 2 and the pressing member 5 are clamped by being moved closer by the clamp member 6.
As described above, since the insert holding member 2 and the pressing member 5 are separated, the insert mounting seat 3 is opened by separating the pressing member 5 from the insert mounting seat 3 of the insert holding member 2. The cutting insert 4 can be attached to or removed from the insert mounting seat 3. Therefore, when the cutting insert 4 is attached to and detached from the insert holding member 2, the cutting insert 4 can be prevented from being rubbed against the insert holding member 2 and the pressing member 5, and the insert holding member 2 and the pressing member 5 can be prevented. Thus, the mounting stability of the cutting insert 4 can be maintained well.

  Further, since the insert holding member 2 and the pressing member 5 are separated, when the clamp member 6 moves them close to each other in the height direction H, the adhesion between the cutting insert 4 and the insert holding member 2 is improved. Not only that, it is possible to ensure sufficient adhesion between the cutting insert 4 and the pressing member 5, and a contact area for clamping the cutting insert 4 is sufficiently ensured.

  As described above, according to the present embodiment, the cutting insert 4 can be stably clamped and the clamp strength can be increased.

  Moreover, in this embodiment, when the insert holding member 2 and the pressing member 5 are moved close to each other in the height direction H by the clamp member 6, the first and second inclined surfaces 11 and 12 are in sliding contact with each other. The pressing member 5 is also moved in the grooving direction La with respect to the insert holding member 2. In this manner, the insert holding member 2 and the pressing member 5 are relatively moved in the height direction H and the grooving direction La (front-rear direction L), so that the cutting insert 4 is not only in the height direction H. Moreover, it becomes possible to clamp also in the grooving direction La (front-back direction L), and the clamp strength of the cutting insert 4 can be raised notably remarkably.

Moreover, in this embodiment, since the insert holding member 2 and the pressing member 5 are connected by a structure in which they are prevented from being detached from each other in a direction away from each other in the height direction H, the following effects are obtained.
That is, in this case, while the insert holding member 2 and the pressing member 5 are formed separately, they are connected to each other by a retaining structure, so that the ease of handling can be improved and the cutting insert 4 can be attached and detached. The operability can be further increased.

  In addition, a pair of insert mounting seats 3 for mounting the cutting inserts 4 are provided at positions that are 180 ° rotationally symmetric about the central axis O along the width direction W of the insert holding member 2. Thus, when these insert mounting seats 3 have the same shape as each other, a new unused insert mounting seat is used instead of the old insert mounting seat 3 that is used and no sufficient insert mounting accuracy can be obtained. 3 can be used, and the tool life can be doubled (extended). The insert mounting seats 3 can be formed in different shapes. In this case, a plurality of types of cutting inserts 4 can be mounted on the blade-replaceable grooving tool 1 to easily cope with various cutting processes. be able to.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the insert holding member 2 is formed with the first inclined surface 11 that gradually extends downward in the height direction H toward the grooving direction La, and the pressing member 5 has the grooving direction La. The second inclined surface 12 extending gradually downward in the height direction H is formed as it goes to, and the first and second inclined surfaces 11 and 12 are slidably contacted with each other. However, the present invention is not limited to this.
That is, a first plane perpendicular to the height direction H is formed on the insert holding member 2, and a portion of the presser member 5 that faces the first plane of the insert holding member 2 is perpendicular to the height direction H. The 2nd plane may be formed and the structure which these planes contact may be sufficient.

  Further, in the above-described embodiment, the insert holding member 2 and the pressing member 5 are connected by a structure in which they are prevented from coming off in a direction away from each other in the height direction H. However, the present invention is not limited to this. Absent. That is, for example, the size (groove width) along the width direction W of the guide groove 7 of the insert holding member 2 is constant throughout the height direction H, and the width of the guide rib 17 of the pressing member 5 is changed in the width direction W. The size along the width (rib width) is constant throughout the height direction H, and the guide grooves 7 and the guide ribs 17 are detachably engaged in the height direction H (removable). May be.

  Further, instead of the first inclined surface 11 and the second inclined surface 12 being connected by the engagement of the guide groove 7 and the guide rib 17, these inclined surfaces 11 and 12 are formed into a V-shaped groove (cross section). Even if the inclined surfaces 11 and 12 are in contact with each other along the direction in which the inclined surfaces 11 and 12 extend due to the engagement between the concave V-shaped grooves and the V-shaped ribs (ribs having a convex V-shaped cross section), Good.

  In addition, in the range which does not deviate from the meaning of this invention, you may combine each structure (component) demonstrated by the above-mentioned embodiment, a modified example, a note, etc., addition of a structure, omission, substitution, others It can be changed. Further, the present invention is not limited by the above-described embodiments, and is limited only by the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Cutting edge exchange-type grooving tool 2 Insert holding member 3 Insert mounting seat 4 Cutting insert 4a Cutting blade 5 Holding member 6 Clamp member 11 1st inclined surface 12 2nd inclined surface H Height direction La Grooving direction O Center axis W Width direction

Claims (4)

An insert holding member;
A cutting insert that is detachably mounted on an insert mounting seat of the insert holding member by projecting a cutting blade from the end of the insert holding member in the grooving direction;
The insert holding member is separated from the insert holding member and is opposed to the insert holding member from above in the height direction in a direction orthogonal to the grooving direction, and the cutting insert is interposed between the insert holding member and the insert holding member. A holding member for sandwiching
A cutting edge-replaceable grooving tool comprising: a clamp member that holds the insert holding member and the pressing member and moves them close to each other in the height direction. It is a blade exchange type grooving tool according to claim 1,
The insert holding member is formed with a first inclined surface that gradually extends downward in the height direction toward the grooving direction,
A portion of the pressing member that faces the first inclined surface is formed with a second inclined surface that gradually extends downward in the height direction toward the grooving direction.
When the insert holding member and the pressing member are moved close to each other in the height direction by the clamp member, the first inclined surface and the second inclined surface are in sliding contact with each other, and the insert holding member On the other hand, the blade member replaceable grooving tool, wherein the pressing member is movable in the grooving direction. It is a blade exchange type grooving tool according to claim 1 or 2,
The insert holding member and the pressing member are connected to each other by a structure in which the insert holding member and the pressing member are prevented from coming off in a direction away from each other in the height direction. It is a cutting edge exchange type grooving tool as described in any one of Claims 1-3,
A pair of the insert mounting seats are formed at positions that are 180 ° rotationally symmetrical about the center axis of the insert holding member along the width direction perpendicular to the grooving direction and the height direction of the insert holding member. A blade-exchangeable grooving tool characterized by that.

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