JP2012035375A - Head member of cutting edge replaceable grooving tool, head member body, and cutting edge replaceable grooving tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure positional accuracy of a cutting edge by preventing a restraint surface of an insert mounting seat from retreating to enhance machining accuracy and prolong tool life.SOLUTION: The insert mounting seat 36 includes a pressing surface of one flange part of a pair of flange parts, a pedestal surface 35 of the other flange part, and the restraint surface 37 positioned between the pair of the flange parts in a vertical direction to be brought into contact with an end surface of a cutting insert 50. A first wall surface 53 inclined with respect to the vertical direction and a second wall surface 54 crossing the first wall surface 53 to form a blunt angle are provided on the end surface of the cutting insert 50. The restraint surface 37 is provided with a first receiving surface 45 to be brought into contact with one wall surface out of the first wall surface 53 and the second wall surface 54 of the of a cutting insert 50, and a second receiving surface 46 arranged facing the other wall surface with a distance therebetween. The distance L2 between the second receiving surface 46 and the other wall surface is set smaller than a projecting amount of the cutting edge of the cutting insert 50 projecting from a head member body 31.

Description

  The present invention relates to a head member, a head member main body, and a blade edge replaceable grooving tool for a blade edge replaceable grooving tool for grooving a peripheral surface and an end surface of a work material.

  Conventionally, a cylindrical or cylindrical work material is rotated around the rotation axis, and the outer peripheral surface, inner peripheral surface, or end surface facing the rotation axis direction of the work material is grooved with a cutting insert cutting edge. 2. Description of the Related Art A blade exchange type grooving tool for performing processing is known (for example, see Patent Document 1 below). This type of cutting edge replacement type grooving tool is attached to the tip of a shaft-shaped tool body made of steel or the like so that a rectangular parallelepiped cutting insert made of cemented carbide or the like can be detachable directly or via the head member body. Is done. An insert mounting seat is formed at the tip of the tool body or head member body to which the cutting insert is attached.

  FIG. 10 shows a head member 100 of a conventional cutting edge exchange type grooving tool. The head member 100 includes a cutting insert 101 having a cutting edge 108 and a head member main body 111 on which an insert mounting seat 107 to which the cutting insert 101 is detachably attached is formed. The head member main body 111 is provided with a pair of jaw portions (upper jaw portion 102 and lower jaw portion 103) for holding the cutting insert 101 in the up-down direction (up-down direction in FIG. 10) and fixing the lower surface of the upper jaw portion 102. A pressing surface 104 is formed, and a pedestal surface 105 is formed on the upper surface of the lower jaw 103. Further, between the pair of jaw portions in the vertical direction, a constraining surface that faces the tip side of the head member 100 (left side in FIG. 10, that is, the tip side of a tool body (not shown) to which the head member 100 is mounted). 106 is formed. An insert mounting seat 107 having a pressing surface 104, a pedestal surface 105, and a restraining surface 106 is formed.

  The cutting insert 101 mounted on the insert mounting seat 107 has an upper surface abutted against the pressing surface 104, a lower surface abutted against the pedestal surface 105, and an end surface facing the rear end side (right side in FIG. 10) restrained. It abuts on the surface 106. The end surface of the cutting insert 101 has an obtuse angle on the first wall surface 109 and a first wall surface (flank) 109 that gradually inclines toward the tip side from the cutting edge 108 formed on the upper edge of the cutting insert 101. And a second wall surface 110 that intersects and extends downward so as to form. The restraint surface 106 of the head member main body 111 and the second wall surface 110 of the cutting insert 101 are brought into contact with each other, so that the movement of the cutting insert 101 relative to the head member main body 111 toward the rear end is restricted.

JP 2009-107073 A

However, the head member, the head member main body, and the blade edge replaceable grooving tool of the conventional blade edge replaceable grooving tool have the following problems.
That is, when grooving the work material, the cutting insert 101 vibrates due to the cutting force, and the second wall surface 110 of the cutting insert 101 and the restraining surface 106 of the insert mounting seat 107 rub against each other. The constraining surface 106 may be plastically deformed when the second wall surface 110 is strongly pressed.

  As a result, as shown by a two-dot chain line in FIG. 11, the constraining surface 106 is retracted to the rear end side (right side in FIG. 11), and the second wall surface 110 of the cutting insert 101 becomes the retraction amount X1 of the constraining surface 106. Accordingly, the cutting insert 101 moves toward the rear end side while moving toward the rear end side. Therefore, in FIG. 10, it is impossible to ensure the positional accuracy of the cutting edge 108a of the cutting insert 101 protruding from the head member main body 111 toward the tip side.

Here, when the retraction amount X1 of the constraining surface 106 is larger than the protrusion amount X2 in which the cutting edge 108a protrudes from the head member main body 111 toward the tip side in advance, the grooving process itself is difficult. Therefore, it is necessary to replace the head member main body 111.
On the other hand, when the protrusion amount X2 is set to be large in advance for the purpose of ensuring a large amount of retraction X1, chatter vibration during grooving increases, and processing accuracy decreases.

  The present invention has been made in view of such circumstances, and it is possible to ensure the positional accuracy of the cutting edge by suppressing the retreat of the restraining surface in the insert mounting seat, the machining accuracy can be improved, and the tool life can be extended. It is an object of the present invention to provide a head member, a head member main body, and a blade edge replaceable grooving tool of a blade edge replaceable grooving tool.

In order to achieve the above object, the present invention proposes the following means.
That is, the present invention includes a cutting insert having a cutting edge, and a head member main body on which an insert mounting seat to which the cutting insert is detachably attached is formed, and is attached to a tip portion of an axial tool body. The blade member replaceable grooving tool head member constituting the blade replaceable grooving tool, wherein the head member body is provided with a pair of jaws for holding the cutting insert in a vertical direction and fixing it. The insert mounting seat is located between the pressing surface of one jaw portion of the pair of jaw portions, the pedestal surface of the other jaw portion, and the vertical direction of the pair of jaw portions. A constraining surface abutting against the end surface of the insert, and a second wall surface that intersects the end surface of the cutting insert so as to form an obtuse angle with the first wall surface that is inclined with respect to the vertical direction. Walls, The restraining surface is provided with a first receiving surface that is in contact with one of the first wall surface and the second wall surface of the cutting insert, and a second receiving member that is disposed opposite to the other wall surface with a space therebetween. A distance between which the second receiving surface is separated from the other wall surface is set to be smaller than a protruding amount by which a cutting edge of the cutting insert protrudes from the head member body. To do.

  According to the head member of the blade-tip-exchangeable grooving tool according to the present invention, the first receiving surface in which the restraint surface of the insert mounting seat comes into contact with one of the first and second wall surfaces of the end surface of the cutting insert. And a second receiving surface disposed opposite to the other wall surface with a space therebetween. When the first receiving surface is scraped or plastically deformed due to grooving, the second receiving surface comes into contact with the other wall surface of the end surface of the cutting insert. As a result, the contact area between the end face of the cutting insert and the restraining surface of the insert mounting seat is increased, so that further wear and plastic deformation on the restraining surface are suppressed, and the cutting insert is located behind the insert mounting seat. Moving toward the side is prevented. Therefore, the positional accuracy of the cutting blade of the cutting insert protruding from the head member main body is ensured, the processing accuracy is increased, and the tool life is extended.

  Further, since the interval at which the second receiving surface is separated from the other wall surface at the end face of the cutting insert is set smaller than the protruding amount by which the cutting edge of the cutting insert protrudes from the head member body, as described above. When the second receiving surface is brought into contact with the other wall surface of the cutting insert, the state in which the cutting edge protrudes from the head member main body is maintained. Therefore, the above-described effect can be reliably obtained.

Furthermore, the following effect is acquired because the 2nd receiving surface is spaced apart from the said other wall surface in the end surface of the cutting insert.
That is, since the first wall surface and the second wall surface intersect each other so as to form an obtuse angle at the end surface of the cutting insert, the first and second receiving surfaces are in contact with the first and second wall surfaces in advance. Since it is difficult to form the first and second receiving surfaces as described above, the end surface of the cutting insert and the constraining surface hit each other, and chatter vibration is likely to occur during processing. Become. On the other hand, according to the present invention, when the second receiving surface is retracted by wear, plastic deformation or the like so that the first receiving surface corresponds to the shape of the one wall surface at the end surface of the cutting insert, Since it is in contact with the other wall surface at the end surface, the above-described point hitting is prevented and the end surface of the cutting insert is securely restrained by the restraining surface, so that the mounting posture of the cutting insert on the insert mounting seat Is stable.

  Further, in the head member of the cutting edge replacement type grooving tool according to the present invention, the second wall surface at the end face of the cutting insert is formed along the vertical direction, and the first receiving surface of the head member body is It is good also as contacting the said 2nd wall surface while being formed so that an up-down direction may be followed.

  According to the head member of the cutting edge replacement type grooving tool according to the present invention, the second wall surface of the end surface of the cutting insert is formed along the vertical direction, and the head member main body that is in contact with the second wall surface Corresponding to this, the first receiving surface is also formed along the vertical direction. In this case, the second wall surface and the first receiving surface are easily brought into contact with each other with high accuracy, and manufacture is also easy.

  Moreover, the head member main body of the present invention is characterized in that it is used for the head member of the above-mentioned blade-tip exchange type grooving tool.

  In addition, the cutting edge exchange type grooving tool of the present invention is characterized in that the head member of the above described cutting edge exchange type grooving tool is mounted on the tip of the tool body.

  Moreover, this invention is a cutting edge exchange type grooving tool provided with the cutting insert which has a cutting edge, and the tool main body in which the insert attachment seat which has an axial shape and the said cutting insert was detachably attached was formed in the front-end | tip part. The tip of the tool body is provided with a pair of jaws for sandwiching and fixing the cutting insert from above and below, and the insert mounting seat is one jaw of the pair of jaws. A pressing surface, a pedestal surface of the other jaw, and a restraining surface that is positioned between the pair of jaws and is in contact with the end surface of the cutting insert, The end surface is provided with a first wall surface that is inclined with respect to the vertical direction and a second wall surface that intersects the first wall surface so as to form an obtuse angle, and the constraining surface is a first wall surface of the cutting insert. And one of the second walls A first receiving surface that is in contact with the surface, and a second receiving surface that is disposed opposite to the other wall surface with an interval therebetween, and the interval at which the second receiving surface is separated from the other wall surface, The cutting edge of the cutting insert is set to be smaller than the protruding amount protruding from the tip of the tool body.

  According to the head member, the head member main body, and the blade edge replaceable grooving tool of the blade edge replaceable grooving tool according to the present invention, the position accuracy of the cutting edge can be ensured by suppressing the backward movement of the restraint surface in the insert mounting seat. Accuracy is increased and tool life can be extended.

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 perspective view which shows the blade-tip-exchange-type grooving tool which concerns on one Embodiment of this invention. It is a side view which shows the head member of the blade-tip-exchange-type grooving tool which concerns on one Embodiment of this invention. It is a front view which shows the head member of the blade-tip-exchange-type grooving tool which concerns on one Embodiment of this invention. It is a top view which shows the head member of the blade-tip-exchange-type grooving tool which concerns on one Embodiment of this invention. It is a figure which expands and shows the restraint surface 37 vicinity of FIG. It is a side view which shows a state when the head member of FIG. 3 is used for grooving. It is a figure which shows a state when the head member of FIG. 6 (FIG. 9) is used for grooving. It is a figure which shows the modification of the restraint surface 37 of FIG. It is a side view which shows the head member of the conventional blade edge | tip-exchange-type grooving tool. It is a figure which expands and shows the restraint surface 106 vicinity of FIG.

  As shown in FIG. 1 and FIG. 2, the cutting edge replacement type grooving tool according to the present embodiment is an insert detachable turning tool that performs grooving or parting-off on a rotating work material. A shaft-shaped tool body 10 held on a tool post (not shown) of the machine, a head member 30 that is detachably attached to a tip portion of the tool body 10, and a tip of the head member 30 from the head member body 31. And a cutting insert 50 that is clamped in a state where the cutting edge 52 protrudes toward the side.

  The tool body 10 is formed of a steel material or the like, and has a substantially regular quadrangular prism shape having an upper surface 11 and a lower surface 12 facing each other and a pair of side surfaces 13A and 13B, and a center axis (hereinafter referred to as “axis”) of the regular square column. (Omitted) On the tip side (lower left side in FIG. 1, lower right side in FIG. 2) of the tool body 10 along O, a protruding portion 15 protruding upward from the upper surface 11 is formed. Further, a concave mounting portion 16 for mounting the head member main body 31 of the head member 30 is provided at the distal end portion of the tool main body 10 in which the protruding portion 15 is formed. Further, the portion other than the tip portion of the tool body 10 has a cross section perpendicular to the axis O having a regular square shape, and is a shank portion 14 extending along the axis O.

The mounting portion 16 is formed in a concave shape so as to cut out a tip surface of the tool body 10 and a portion on the side surface 13A side in the tip portion. The mounting portion 16 has a plurality of female screw holes (not shown) corresponding to positions of screw insertion holes 40 and 41 of the head member body 31 described later.
A clamp screw hole (not shown) is formed in the projecting portion 15 so as to be gradually separated from the side surface 13A toward the lower side in a plane orthogonal to the axis O from the upper end portion downward. .

As shown in FIGS. 3 to 5, the head member 30 includes a cutting insert 50 having a cutting edge 52 and a head member body 31 in which an insert mounting seat 36 to which the cutting insert 50 is detachably attached is formed. ing.
The head member main body 31 is integrally formed from a steel material or the like. In FIG. 5, the head member main body 31 has a multi-stage substantially flat plate shape in which the rear end portion (upper portion in FIG. 5) is thicker than the front end portion (lower portion in FIG. 5). .

  Specifically, in a mounting state in which the head member body 31 is attached to the tool body 10, a side surface (side surface facing the right side in FIG. 5) 31A of the head member body 31 facing the same direction as the side surface 13A of the tool body 10; A side surface (side surface facing the left side in FIG. 5) 31B facing the opposite side is arranged in parallel to each other. However, the head member main body 31 has a side surface 31A that is planar in the direction of the axis O (front-rear direction) in the top view of FIG. The main body 10 is formed to protrude one step toward the side surface 13B.

  Further, a projecting wall portion 31D having a flat plate shape is formed to protrude from the leading edge at the rear end portion of the side surface 31B, and the rear surface 31E facing the rear end side of the projecting wall portion 31D has an axis line in the mounted state. It is formed along the surface direction perpendicular to O.

  As shown in FIGS. 1 to 3, the tip portion of the head member main body 31 extends toward the tip end side along the side surface 13 </ b> A of the tool main body 10 in the attached state, and the cutting insert 50 extends in the vertical direction. A pair of jaw parts (upper jaw part 32 and lower jaw part 33) to be held and fixed from above are formed. In FIG. 3, the upper jaw portion 32 has a triangular plate shape, and the lower jaw portion 33 has a rectangular plate shape. Further, the lower jaw 33 is formed so as to protrude from the upper jaw 32 to the distal end side.

  Further, of the pair of jaw portions 32 and 33, the upper jaw portion 32 that is one jaw portion in the present embodiment is provided with a pressing surface 34 that presses the cutting insert 50 from above, and the lower jaw that is the other jaw portion. The portion 33 is provided with a pedestal surface 35 that is disposed to face the pressing surface 34. As shown in the front view of FIG. 4, when the head member main body 31 is viewed from the distal end side, the pressing surface 34 has a convex V shape that is convex downward, and the pedestal surface 35 is convex upward. Convex V shape.

Further, as shown in FIG. 3, the head member main body 31 is positioned between the pair of jaw portions 32 and 33 and faces the distal end side of the head member main body 31, and a cutting insert 50 described later. A constraining surface 37 is formed to be in contact with the end surface.
As described above, the head member main body 31 has the insert mounting seat 36 including the pressing surface 34, the pedestal surface 35, and the restraining surface 37 that opens toward the front end side of the head member main body 31 and extends toward the rear end side. It is formed in a concave shape. Then, the cutting insert 50 is inserted toward the rear end side with respect to the insert mounting seat 36 and is detachably attached to the head member main body 31.

  Further, in FIG. 3, from between the restraining surface 37 and the pressing surface 34 of the head member main body 31, the side surfaces 31A and 31B in the rear end portion of the head member main body 31 penetrate perpendicularly to the side surfaces 31A and 31B. In addition, a slit 38 extending from the rear end of the insert mounting seat 36 toward the rear end side is formed. Further, the rear end portion of the slit 38 is a bent portion 38A that is bent so as to extend upward toward the rear end side. The head member main body 31 can be elastically deformed with the connecting portion 39 positioned on the rear end side of the slit 38 as a fulcrum, so that the upper jaw portion 32 can be bent toward the lower jaw portion 33 side. It has become.

  The head member 30 is seated on the tool body 10 so that the rear end portion of the head member body 31 is inserted into the mounting portion 16 at the tip of the tool body 10. Here, a plurality of screw insertion holes 40 penetrating the rear end portions are formed in the rear end portion of the head member main body 31 so as to extend perpendicularly to the side surfaces 31A and 31B. Further, a plurality of screw insertion holes 41 penetrating through the protruding wall portion 31D are formed in the protruding wall portion 31D of the head member main body 31 so as to extend perpendicularly to the back surface 31E. These screw insertion holes 40 and 41 have a circular cross section, but the diameter of the bottom of the hole is reduced so that the back surface of the head of the fixing screw 42 abuts.

  Then, with the head member main body 31 of the head member 30 seated on the mounting portion 16, the fixing screw 42 is inserted into the screw insertion holes 40 and 41 and screwed into the female screw hole of the mounting portion 16. The head member 30 is fixed so that the rear end portion of the side surface 31B of the head member main body 31, the rear surface 31E of the protruding wall portion 31D, and the rear end portion of the lower surface 31C are pressed against the surface (inner surface) of the mounting portion 16. It is attached to the tool body 10.

  The rear end surface 31F of the head member main body 31 is perpendicular to the side surfaces 31A and 31B, and as shown in FIG. 3, the lower surface 31C forms a step shape toward the rear end side in a side view facing the side surface 31A. It is formed to go to the side. However, the rear end surface 31F is spaced apart from the wall surface (inner surface) located at the rear end portion of the mounting portion 16 and facing the front end side in the attached state.

  Further, the head member main body 31 is formed with a counterbore portion 43 that opens to the upper surface 31G and the side surface 31B on the front end side with respect to the connection portion 39. The main body 10 is slanted so as to form a circular cross section centering on the center line of the clamp screw hole (not shown) in communication with the concave portion 23 opened on the upper surface of the protruding portion 15 of the main body 10. Further, the bottom face 43A of the counterbore part 43 is formed in an arc shape as shown in FIG. 5, and gradually recedes downward toward the side face 31A side and the rear end side of the head member body 31. 31B is inclined at an acute angle, and is arranged so as to protrude one step from a stepped surface (not shown) of the recess 23 toward the center line direction of the clamp screw hole in the mounted state.

  As shown in FIGS. 1 and 3, in the head member 30 of the present embodiment, a polygonal hole shape recessed from the side surfaces 31 </ b> A and 31 </ b> B at the rear end portions of the side surfaces 31 </ b> A and 31 </ b> B of the head member main body 31. A plurality of recesses 44 are formed (the recess 44 on the side surface 31B is not shown). These recesses 44 do not penetrate the head member main body 31, and do not open to the front end surface, the rear end surface 31F, the upper surface 31G, the lower surface 31C, and the slit 38 or the screw insertion hole 40 of the head member main body 31. Further, the recesses 44 are formed so as not to communicate with each other.

The head member main body 31 having such a recess 44 is formed by cutting out the head member main body 31 in which the recess 44 is not formed from a steel material or the like, and then forming the recess 44 by an end mill or the like. For example, a divided material obtained by reversing the shape of the head member main body 31 from a material made by mixing a raw material powder of a steel material to be the head member main body 31 and a binder such as a resin with fluidity is used. It can also be manufactured by MIM (Metal Injection Molding) method, in which the binder is removed by heating after injection molding in the mold and the raw material fine powder is sintered. When manufactured by such an MIM method, a draft angle is given to the inner wall surface of the recess 44 so as to incline outward from the bottom surface of the recess 44 toward the side surfaces 31A and 31B.
In addition, even when manufactured by the MIM method or manufactured by cutting, the head member body 31 manufactured is urged to harden the surface by injecting hard small spherical particles on the surface thereof. Peening is preferably performed.

  The grooving / cutting-off cutting insert 50 attached to the insert mounting seat 36 of the head member main body 31 is made of a hard material such as cemented carbide and formed in a rectangular parallelepiped shape or a square bar shape having a substantially square cross section. An insert body 51 is provided. In the present embodiment, the cutting insert 50 is set such that the extending direction of the insert body 51 is parallel to the axis O.

  As shown in FIG. 4, the insert body 51 has a lower surface and a central portion of the upper surface formed in a V-shaped cross section, and the head surface 31 has a pressing surface 34 and a pedestal surface 35 that have a V-shaped cross section. It can be contacted. Further, as shown in FIG. 3, rake faces are formed at both ends of the upper surface of the insert body 51 at positions one step backward from the center, and cutting edges 52 are provided at both edges of the rake face. A pair is formed.

  Further, as shown in FIGS. 3 and 6, both end faces of the insert main body 51 facing in the axis O direction (left and right direction in FIGS. 3 and 6) A second wall surface 54 that intersects the first wall surface 53 so as to form an obtuse angle is provided. 3 and 6, the first wall surface 53 gradually moves inward in the direction of the axis O of the insert body 51 as it goes downward from the cutting edge 52 formed at the upper end edge of the end surface of the insert body 51. The first wall surface 53 is a flank. Further, the second wall surface 54 is formed along the vertical direction in this side view.

  Then, in a state where the cutting insert 50 is inserted into the insert mounting seat 36, the end surfaces facing the rear end side of the both end surfaces of the insert body 51 are brought into contact with the restraining surface 37 of the head member body 31. The movement of the cutting insert 50 toward the rear end side with respect to the member main body 31 is restricted. Specifically, as shown in FIG. 6, the constraining surface 37 of the head member body 31 includes a first receiving surface 45 that comes into contact with one of the first wall surface 53 and the second wall surface 54 of the cutting insert 50, A second receiving surface 46 disposed opposite to the other wall surface with an interval, and in this embodiment, the first receiving surface 45 of the head member body 31 and the second wall surface 54 of the cutting insert 50 (one side). , The movement of the cutting insert 50 to the rear end side (the right side in FIG. 6) with respect to the head member main body 31 is restricted.

  In FIG. 6, the first receiving surface 45 of the head member main body 31 is formed along the vertical direction corresponding to the second wall surface 54 of the cutting insert 50. In the present embodiment, the first receiving surface 45 and the second wall surface 54 are formed along the surface direction perpendicular to the axis O. Moreover, the 2nd receiving surface 46 is inclined with respect to the up-down direction so that it may become parallel to the 1st wall surface 53 (other wall surface) of the cutting insert 50 which opposes at intervals. The upper end of the second receiving surface 46 is disposed below the upper end edge (that is, the cutting edge 52) of the first wall surface 53. Further, the lower end portion of the second receiving surface 46 is formed in a concave curved surface shape, and the lower end edge thereof is continuous with the first receiving surface 45 so as to form an obtuse angle.

  The interval L2 at which the second receiving surface 46 is separated from the first wall surface 53 is a protrusion in which the cutting edge 52A located on the distal end side of the cutting insert 50 in FIG. 3 is projected from the head member body 31 toward the distal end side. It is set smaller than the amount L1. That is, L2 <L1, and specifically, the interval L2 is set within a range of 0 mm <L2 <1 mm. In addition, it is preferable that the space | interval L2 is set to 1/10 or less with respect to the protrusion amount L1. In this embodiment, L1 = 1 mm and L2 = 0.1 mm.

  In this way, the cutting insert 50 has its one cutting edge 52 directed toward the tip side with respect to the head member main body 31 of the head member 30 in the attached state, and has a concave V-shaped lower surface and upper surface center portion. When the end surface of the insert body 51 is inserted into the insert mounting seat 36 from the front end side and facing the rear end side so as to face the pedestal surface 35 and the pressing surface 34, the axis O direction Is positioned.

  Then, as shown in FIGS. 1 and 2, the head of the clamp screw 47 is seated on the head member body 31 by screwing the clamp screw 47 into the clamp screw hole formed in the protruding portion 15 of the tool body 10. The upper jaw portion 32 is pressed against the bottom surface 43A of the bore portion 43, and then the upper jaw portion 32 is pressed in the direction in which the clamp screw hole is drilled. The head member main body 31 has the upper jaw portion 32 as the lower jaw portion 33 with the connection portion 39 as a fulcrum. The pressing surface 34 presses the insert main body 51 toward the pedestal surface 35 and the cutting insert 50 is clamped.

  As described above, according to the head member 30 and the head member main body 31 of the cutting edge exchange type grooving tool according to the present embodiment and the cutting edge exchange type grooving tool in which this is attached to the tip of the tool main body 10, The first receiving surface 45 with which the constraining surface 37 of the insert mounting seat 36 is in contact with one of the first and second wall surfaces 53 and 54 on the end surface of the cutting insert 50 (the second wall surface 54 in this embodiment). And a second receiving surface 46 disposed opposite to the other wall surface (the first wall surface 53 in the present embodiment) with a space therebetween. 7 and 8, when the first receiving surface 45 is scraped or plastically deformed by grooving, the second receiving surface 46 is moved to the other end surface of the cutting insert 50. This is in contact with the wall surface (first wall surface 53).

  Thereby, since the contact area of the end surface of the cutting insert 50 and the restraint surface 37 of the insert mounting seat 36 is increased, further wear and plastic deformation on the restraint surface 37 are suppressed, and the cutting insert 50 is It is prevented from moving toward the back side (rear end side) of the insert mounting seat 36. Therefore, the positional accuracy of the cutting edge 52A (52) of the cutting insert 50 protruding from the head member main body 31 is ensured, the processing accuracy is increased, and the tool life is extended.

  In FIG. 6, an interval L <b> 2 where the second receiving surface 46 is separated from the other wall surface (first wall surface 53) at the end surface of the cutting insert 50 is such that the cutting edge 52 </ b> A of the cutting insert 50 protrudes from the head member body 31. Therefore, when the second receiving surface 46 is brought into contact with the other wall surface of the cutting insert 50 as described above, the cutting edge 52A is protruded from the head member main body 31. Maintained. Therefore, the above-described effect can be reliably obtained.

The distance L2 is set within the range of 0 mm <L2 <1 mm, so that the second receiving surface 46 of the head member body 31 and the first wall surface 53 of the cutting insert 50 are applied relatively early from the start of use. In addition to being contacted, the above-described effects can be obtained early, which is more preferable.
Further, when the interval L2 is set to 1/10 or less of the protrusion amount L1, the second receiving surface 46 and the first wall surface 53 are brought into contact with each other by use (the interval L2 becomes 0). ), The protrusion amount (L1-L2) of the cutting edge 52A from the head member main body 31 toward the tip side is sufficiently secured, and the effect of extending the tool life is further enhanced.

Further, in FIG. 6, the second receiving surface 46 is separated from the other wall surface (the first wall surface 53) on the end surface of the cutting insert 50, thereby obtaining the following effects.
That is, since the first wall surface 53 and the second wall surface 54 intersect with each other so as to form an obtuse angle at the end surface of the cutting insert 50, the first wall surface 53 and 54 are in contact with each other in advance. The formation of the first and second receiving surfaces 45 and 46 is difficult in manufacturing, and when such first and second receiving surfaces 45 and 46 are used, the end surface of the cutting insert 50 and the constraining surface 37 are pointed to each other. It will hit, and chatter vibrations are likely to occur during machining. On the other hand, according to the present embodiment, the second receiving surface 46 is worn, plastically deformed or the like so that the first receiving surface 45 corresponds to the shape of the one wall surface (second wall surface 54) at the end surface of the cutting insert 50. When it is retracted by the above, it is brought into contact with the other wall surface (first wall surface 53) of the end surface of the cutting insert 50, so that the above-mentioned point hitting is prevented and the end surface of the cutting insert 50 is made into the restraint surface 37. It will be restrained reliably and the mounting | wearing attitude | position to the insert mounting seat 36 of the cutting insert 50 will be stabilized.

  In the present embodiment, the second wall surface 54 on the end surface of the cutting insert 50 is formed along the vertical direction, and the first receiving surface 45 of the head member body 31 that is in contact with the second wall surface 54 is also Corresponding to this, it is formed along the vertical direction. In this case, the second wall surface 54 and the first receiving surface 45 are easily brought into contact with each other with high accuracy, and are easily manufactured.

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 restraining surface 37 of the head member main body 31 is in contact with the second wall surface 54 at the end surface facing the rear end side of the cutting insert 50, and the first surface of the end surface. The second receiving surface 46 is disposed opposite to the wall surface 53 with a space therebetween, but is not limited thereto.

  FIG. 9 shows a modification of the restraining surface 37 of the above-described embodiment. In the illustrated example, of the first wall surface 53 and the second wall surface 54 of the cutting insert 50, the first wall surface 53 is one wall surface and the second wall surface 54 is the other wall surface. Specifically, the constraining surface 37 of the head member main body 31 includes a first receiving surface 65 that is in contact with a first wall surface 53 (one wall surface) on an end surface facing the rear end side of the cutting insert 50, and a second end surface of the end surface. And a second receiving surface 66 disposed to face the wall surface 54 (the other wall surface) with a space therebetween. The 1st receiving surface 65 is inclined with respect to the up-down direction so that it may become parallel to the 1st wall surface 53 of the cutting insert 50 which opposes. Moreover, the 2nd receiving surface 66 is formed so that the vertical direction may be corresponded to the 2nd wall surface 54 of the cutting insert 50 which opposes at intervals. Further, the interval L3 at which the second receiving surface 66 is separated from the second wall surface 54 is set to be smaller than the protrusion amount L1 at which the cutting edge 52A of the cutting insert 50 protrudes from the head member body 31. Note that L3 <L1, and specifically, the interval L3 is set within a range of 0 mm <L3 <1 mm. The interval L3 is set to 1/10 or less of the protrusion amount L1. Even in this configuration, the same effect as the above-described embodiment can be obtained.

  Moreover, although the 2nd wall surface 54 of the cutting insert 50 and the 1st receiving surface 45 and the 2nd receiving surface 66 of the head member main body 31 were formed along the up-down direction, it is not limited to this. Alternatively, these surfaces may be formed to be inclined with respect to the vertical direction.

  Moreover, in the above-mentioned embodiment, although the cutting insert 50 decided that the extension direction of the insert main body 51 was set in parallel with the axis line O, it is not limited to this. That is, the extending direction of the insert body 51 of the cutting insert 50 may be set so as to be inclined or intersected with the axis O. In this case, the cutting edge 52 </ b> A (52) of the cutting insert 50 may protrude toward the side surface 13 </ b> A or the side surface 13 </ b> B in addition to protruding toward the tip end side of the tool body 10. Here, since the extending direction of the insert mounting seat 36 of the head member main body 31 is set corresponding to the extending direction of the cutting insert 50, the insert mounting seat 36 opens to the side surface 13A (13B) side. However, it may be formed in a concave shape extending toward the side surface 13B (13A).

  In the above-described embodiment, the head member 30 is mounted on the tip of the tool body 10 and the insert mounting seat 36 is formed on the head member body 31 of the head member 30. However, the present invention is not limited to this. For example, it may be a cutting edge exchange type grooving tool in which the insert mounting seat 36 is directly formed at the tip of the tool body 10.

DESCRIPTION OF SYMBOLS 10 Tool main body 30 Head member 31 Head member main body 32 Upper jaw part (one jaw part)
33 Lower jaw (the other jaw)
34 Pressing surface 35 Base surface 36 Insert mounting seat 37 Restraint surface 45, 65 First receiving surface 46, 66 Second receiving surface 50 Cutting insert 52, 52A Cutting edge 53 First wall surface (flank)
54 2nd wall surface L1 Projection amount of cutting edge L2, L3 Interval at which the second receiving surface is separated from the end surface of the cutting insert

Claims (5)

A cutting insert having a cutting edge, and a head member body on which an insert mounting seat to which the cutting insert is detachably attached is provided, and is attached to the tip of an axial tool body so that the cutting edge is replaceable. It is a head member of a cutting edge exchange type grooving tool constituting the grooving tool,
The head member body is provided with a pair of jaws for holding the cutting insert in a vertical direction and fixing it,
The insert mounting seat is located between the pressing surface of one jaw portion of the pair of jaw portions, the pedestal surface of the other jaw portion, and the vertical direction of the pair of jaw portions of the cutting insert. A restraining surface abutting on the end surface,
The end surface of the cutting insert is provided with a first wall surface that is inclined with respect to the vertical direction, and a second wall surface that intersects to form an obtuse angle with the first wall surface,
The constraining surface includes a first receiving surface that is in contact with one of the first wall surface and the second wall surface of the cutting insert, and a second receiving surface that is disposed to face the other wall surface with a space therebetween, With
The interval at which the second receiving surface is separated from the other wall surface is set to be smaller than the protrusion amount of the cutting blade of the cutting insert protruding from the head member main body. Tool head member. It is a head member of the cutting edge exchange type grooving tool according to claim 1,
The second wall surface at the end face of the cutting insert is formed along the vertical direction,
The first member receiving surface of the head member main body is formed so as to extend in the vertical direction, and abuts against the second wall surface.   3. A head member main body used for a head member of the cutting edge replacement type grooving tool according to claim 1 or 2.   A blade edge-replaceable grooving tool, wherein the head member of the blade edge-replaceable grooving tool according to claim 1 or 2 is attached to a tip portion of the tool body. A cutting edge replaceable grooving tool comprising: a cutting insert having a cutting edge; and a tool body having an axial shape and an insert mounting seat to which the cutting insert is detachably attached.
At the tip of the tool body, a pair of jaws for holding the cutting insert from above and below to be fixed is provided,
The insert mounting seat is located between the pressing surface of one jaw portion of the pair of jaw portions, the pedestal surface of the other jaw portion, and the vertical direction of the pair of jaw portions of the cutting insert. A restraining surface abutting on the end surface,
The end surface of the cutting insert is provided with a first wall surface that is inclined with respect to the vertical direction, and a second wall surface that intersects to form an obtuse angle with the first wall surface,
The constraining surface includes a first receiving surface that is in contact with one of the first wall surface and the second wall surface of the cutting insert, and a second receiving surface that is disposed to face the other wall surface with a space therebetween, With
An interval at which the second receiving surface is separated from the other wall surface is set to be smaller than a protruding amount by which a cutting edge of the cutting insert protrudes from a tip end portion of the tool body. Grooving tool.

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