JP2014046435A - Cutting insert and cutting tool using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting insert that can be ground and formed, even if having a specification of six corners.SOLUTION: A cutting insert 1 has an A surface 2, a B surface 3 and a side surface 4. The A and B surfaces have an approximate triangle shape having A1-A3 and B1-B3 vertices of an interior angle α, respectively. The side surface 4 is configured by alternately combining total six surfaces of an AB downward tapered surface 4a intersecting at an acute angle β to the A surface and intersecting with the B surface at an obtuse angle κ, and a BA downward tapered surface 4b intersecting with the B surface at the acute angle β and intersecting with the A surface at the obtuse angle κ. Also, an upwardly inclined taper is provided toward the center between the vertices on the AB and BA downward tapered surfaces 4a and 4b. An edge line 40a of the A surface and the AB downward tapered surface 4a, or an edge line 40b of the B surface and the BA downward tapered surface 4b is a main cutting edge. The A surface or B surface is a side flank. An edge line 40c in which the AB downward tapered surface 4a intersects with the BA downward tapered surface 4b is an end cutting edge. One surface of the AB downward tapered surface 4a corresponding to the end cutting edge and the BA downward tapered surface 4b is a rake surface, and the other surface is a front flank surface. By this arrangement, corner portions 41a-41f where the main cutting edge intersects with the end cutting edge cross are chamfered.

Description

  The present invention relates to a flat plate-shaped polygonal cutting insert having an A surface, a B surface, and a side surface, a front milling cutter equipped with the cutting insert, a boring cutting tool, and a turning cutting tool.

  For example, Patent Document 1 discloses a cutting insert having an outer shape formed in a flat triangular shape and having an A surface, a B surface, and a side surface. Such a cutting insert has a 6-corner specification and is advantageous in terms of economy.

JP 2010-64224 A

  The conventional cutting insert has a complicated shape in which a constraining surface that is constrained by abutting against an insert mounting portion of a tool body is formed in a concave groove shape at an intermediate portion in the thickness direction of the side surface. If the shape of the cutting insert is complicated, the processing means is limited such that it is necessary to form with a press having a lateral press shaft, and the materials that can be used by the processing means are also limited. For example, in the case of ceramic, excellent performance can be demonstrated in the high-speed cutting area, but the rake face performance that affects cutting is formed by grinding the sintered skin when formed with a press. Because it is often inferior to the sintered skin in the case of a complicated shape, it is difficult to realize a complicated shape.

  The present invention has been made in view of the above, and an object of the present invention is to provide a cutting insert having a shape that can be molded by grinding while having a 6-corner specification, and a front surface on which such a cutting insert is mounted. An object of the present invention is to provide a milling cutter, a boring cutting tool, and a turning cutting tool.

In order to achieve the above object, the present invention as described in claim 1,
A flat plate-shaped cutting insert having an A surface, a B surface, and a side surface,
The A plane and the B plane are approximate triangular shapes in which three vertices having an inner angle α of 70 ° to 85 ° satisfy a three-fold symmetry relationship,
The side surfaces intersect with the A surface at an acute angle β greater than 70 ° and smaller than 85 ° and intersect with the B surface at an obtuse angle κ of (180 ° −β), and the B surface The BA downwardly inclined tapered surface that intersects at the acute angle β and intersects the A surface at the obtuse angle κ is formed so as to be adjacent to each other with the vertices sandwiched therebetween, and is also adjacent between the vertices. A total of six surfaces are alternately combined, and the AB downwardly inclined taper surface and the BA downwardly inclined taper surface are provided with a taper inclined upward toward the center between the vertices.
A ridge line where the A surface and the AB downward tapered surface intersect or a ridge line where the B surface and the BA downward tapered surface intersect as a main cutting edge,
The A surface or the B surface is a lateral relief surface,
A ridge line where the AB downwardly inclined taper surface and the BA downwardly inclined taper surface adjacent to each other with the apex interposed therebetween is defined as a front cutting edge,
One of the AB downwardly inclined tapered surface and the BA downwardly inclined tapered surface corresponding to the front cutting edge is used as a rake face, and the other is used as a front flank.
Furthermore, the present invention provides a cutting insert in which a corner portion where the main cutting edge and the front cutting edge intersect each other is R-chamfered and / or C-chamfered.

  According to a second aspect of the present invention, there is provided the cutting insert according to the first aspect, wherein the cutting insert is made of a ceramic material, and at least the AB downward tapered surface and the BA downward tapered surface are formed by grinding.

As described in claim 3,
A face milling cutter that attaches the cutting insert according to claim 1 or 2 to a plurality of insert mounting portions provided on an outer peripheral surface of a tool body and rotates the shaft integrally with the tool body,
The insert mounting portion is
An abutting wall that abuts the A or B surface of the cutting insert;
Two constraining walls that constrain the side surface,
Further, the two constraint walls have an inclination in which an interval between the two constraining walls gradually increases toward the cutting side when viewed from the outer peripheral side of the tool body, and an engagement wall having an overhang taper at an inward edge of each other. Is,
On the other hand, in the cutting insert, when the A surface is brought into contact with the abutting wall of the insert mounting portion, the AB inclined taper surface or the B surface which becomes an obtuse angle with the corresponding contacting wall or the B surface of the insert mounting portion. A front milling cutter that engages the two walls of the downward inclined taper surface of the BA, which has an obtuse angle with the corresponding wall when brought into contact with the contact wall, with the engagement walls of the two restraint walls of the insert mounting portion. provide.

As described in claim 4,
A face milling cutter that attaches the cutting insert according to claim 1 or 2 to a plurality of insert mounting portions provided on an outer peripheral surface of a tool body and rotates the shaft integrally with the tool body,
The insert such that the A-side or the B-side is the outer peripheral side and the corner angle x = 5 ° to 45 °, the axial rake angle y = 0 ° to 15 °, and the radial rake angle z = 0 ° to 15 °. Provided is a face milling cutter which is attached to a mounting portion.

Moreover, as described in claim 5,
A face milling cutter that attaches the cutting insert according to claim 1 or 2 to a plurality of insert mounting portions provided on an outer peripheral surface of a tool body and rotates the shaft integrally with the tool body,
The insert such that the A-side or the B-side is the outer peripheral side and the corner angle x = 5 ° to 45 °, the axial rake angle y = 0 ° to 15 °, and the radial rake angle z = 0 ° to 15 °. The front milling cutter according to claim 3, which is mounted on the mounting portion.

Moreover, as described in claim 6,
A cutting tool for boring is provided by mounting the cutting insert according to claim 1 or 2 on an insert mounting portion provided at a tip of a tool body.

Moreover, as described in claim 7,
The insert mounting portion is
An abutting wall that abuts the A or B surface of the cutting insert;
Two constraining walls that constrain the side surface,
Further, the two constraint walls have an inclination in which an interval between the two constraining walls gradually increases toward the cutting side when viewed from the outer peripheral side of the tool body, and an engagement wall having an overhang taper at an inward edge of each other. Is,
On the other hand, in the cutting insert, when the A surface is brought into contact with the abutting wall of the insert mounting portion, the AB inclined taper surface or the B surface which becomes an obtuse angle with the corresponding contacting wall or the B surface of the insert mounting portion. The two surfaces of a BA downwardly inclined taper surface that becomes obtuse with the corresponding wall when being brought into contact with the contact wall are engaged with the engagement walls of the two restraint walls of the insert mounting portion. A cutting tool for boring described is provided.

  In addition, as described in claim 8, there is provided a cutting tool for turning formed by mounting the cutting insert according to claim 1 or 2 on an insert mounting portion provided at a tip of a tool body.

Moreover, as described in claim 9,
The insert mounting portion is
An abutting wall that abuts the A or B surface of the cutting insert;
Two constraining walls that constrain the side surface,
Further, the two constraint walls have an inclination in which an interval between the two constraining walls gradually increases toward the cutting side when viewed from the outer peripheral side of the tool body, and an engagement wall having an overhang taper at an inward edge of each other. Is,
On the other hand, in the cutting insert, when the A surface is brought into contact with the abutting wall of the insert mounting portion, the AB inclined taper surface or the B surface which becomes an obtuse angle with the corresponding contacting wall or the B surface of the insert mounting portion. The two surfaces of a BA downwardly inclined taper surface which becomes obtuse with the corresponding wall when being brought into contact with the abutting wall are engaged with the engaging walls of the two restraining walls of the insert mounting portion. A turning cutting tool as described is provided.

  Since the cutting insert having the shape according to claim 1 has the same cutting edge, each of which is divided by a plane that divides the side surface into two equal parts, the one with a 6-corner specification excellent in economic efficiency can be obtained by grinding. Can be molded. Therefore, the range of processing means selection is widened, and the width of usable materials is also widened. Moreover, since this cutting insert can set both an axial rake angle and a radial rake angle positively in the state with which the tool main body was mounted | worn, it is excellent also in sharpness.

  Further, the cutting insert is made of a ceramic material as described in claim 2, and at least the AB inclined taper surface and the BA inclined taper surface are formed by grinding, thereby improving the performance of the rake face that affects cutting. Thus, excellent performance can be exhibited in the high-speed cutting area inherent to ceramics. Further, the AB inclined taper surface and the BA inclined taper surface are inclined and can be formed at low cost by a commercially available CNC tool grinder, etc., so that the manufacturing cost per corner portion (cutting edge) can be reduced. Can be suppressed.

  Further, in the face milling cutter according to claim 3, the two tapered surfaces having the same inclination of the cutting insert and the engagement wall of the constraint wall of the tool body are formed in a dovetail shape like a combination of a dovetail groove and an ant tenon. Because of the engagement, the centrifugal force acting on the cutting insert during cutting can be received by the two constraining walls. Therefore, it is possible to reduce the danger that the cutting insert is scattered by the centrifugal force during cutting.

  Further, by attaching the cutting insert of the present invention to the tool body with the setting described in claim 4, a so-called double positive edge type face milling cutter having excellent cutting performance can be provided.

  In addition, since the cutting insert of the present invention is attached to the insert mounting portion provided at the tip of the tool body as described in claim 6, both the vertical and right-angle rake angles can be easily set to be positive. It is possible to provide a cutting tool for boring which has a 6-corner specification and reduces the load during cutting and has excellent boring performance.

  Further, in the cutting tool for boring processing according to claim 7, the two tapered surfaces having the same inclination of the cutting insert and the engagement wall of the constraint wall of the tool body are formed in a dovetail shape like dovetail grooves and dovetails. Because of the engagement, the centrifugal force generated in the cutting insert during rotation can be received by the two restraining walls. Therefore, the danger that the cutting insert is scattered by centrifugal force can be reduced.

  Further, by attaching the cutting insert of the present invention to the insert mounting portion provided at the tip of the tool body as described in claim 8, both the vertical and right-angle rake angles can be easily set to be positive. Although it is a 6 corner specification, it is possible to provide a turning tool for turning with reduced cutting load and excellent cutting performance.

  Further, in the cutting tool for turning according to claim 9, the two tapered surfaces having the same inclination of the cutting insert and the engagement wall of the constraint wall of the tool body are formed in a dovetail shape like dovetail grooves and dovetails. Since it engages, the load received at the time of cutting can be received by two constraining walls. Therefore, it is possible to reduce the danger that the insert is scattered by a load during cutting.

(A) is a front view of the cutting insert as viewed from the A surface side, (b) is a rear view of the cutting insert as viewed from the B surface side, and (c) is a view of the A surface as viewed from the arrows V1 and V2. A solid line shows a side view of the B surface represented by a broken line, and FIG. 6D is a bottom view of the cutting insert viewed from the arrow V3 with a solid surface of the A surface and a broken line of the B surface. It is a perspective view of a cutting insert. It is a front view of the front milling cutter containing the principal part enlarged view. It is a side view of the front milling cutter containing the principal part enlarged view. It is a bottom view of the front milling cutter containing the principal part enlarged view.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, the cutting insert 1 has a flat plate polygonal shape including an A surface 2, a B surface 3, and a side surface 4, and a through hole for screw insertion at the center (center of gravity). 5 The through hole 5 has tapered portions 5a at both ends.

As shown in FIG. 1A, the A surface 2 has three vertices A1 to A3 having an inner angle α of 70 ° to 85 ° (in the embodiment, α = 80 °) and a three-fold symmetrical relationship. An approximate triangular shape to satisfy.
As shown in FIG. 1B, the B surface 3 has the inner angle α and the three vertices B1 to B3 corresponding to the opposite sides of the vertices A1 to A3 of the A surface 2 are symmetrical three times. An approximate triangular shape that satisfies the relationship.
Strictly speaking, the vertexes A1 to A3 of the A surface 2 and the vertices B1 to B3 of the B surface 3 are alternately arranged on the side surface 4 with two kinds of tapered surfaces having different inclination directions as described later. There is a slight angle shift (about 5.4 ° in the embodiment).

  As shown in FIG. 1 (d), the side surface 4 intersects the A plane 2 represented by a solid line at an acute angle β (in the embodiment, β = 80 °) greater than 70 ° and less than 85 ° and is indicated by a broken line. AB downwardly inclined tapered surface 4a that intersects with the expressed B surface 3 at an obtuse angle κ (in the embodiment, κ = 100 °) of (180 ° −β), and as shown in FIG. The BA downwardly inclined tapered surface 4b that intersects at the acute angle β and intersects the A surface 2 at the obtuse angle κ is formed so as to be adjacent to each other with the vertices A1_B1, A2_B2, and A3_B3 interposed therebetween, and the vertices A1_B1, A total of six surfaces are alternately combined so as to be adjacent to each other between A2_B2 and A3_B3, and the AB downwardly inclined tapered surface 4a and the BA downwardly inclined tapered surface 4b are upwardly directed toward the intermediate points of the vertices A1_B1, A2_B2, and A3_B3. Inclined taper ( When words are those central toward the intermediate point it is formed by providing a tapered) which is inclined in a direction in which ridges. In addition, since the taper which inclines upward of the side surface 4 lies between the vertices A1_A2, A2_A3 and A3_A1 of the A surface 2 or between the vertices B1_B2, B2_B3 and B3_B1 of the B surface 3, so that the A surface 2 The shape of the B surface 3 can also be viewed as a substantially hexagonal shape as shown in FIGS.

  The above cutting insert 1 is formed of a ceramic material, and the A surface 2, the B surface 3, and the side surface 4 are sintered skins formed by grinding. Then, the ridge line 40a where the A surface 2 and the AB downwardly inclined taper surface 4a intersect or the ridgeline 40b where the B surface 3 and the BA downwardly inclined tapered surface 4b intersect is a main cutting edge, and the A surface 2 or the B surface 3 is a lateral clearance surface. And a ridge line 40c where the AB downwardly inclined taper surface 4a and the BA downwardly inclined taper surface 4b intersect with each other with the apexes A1_B1, A2_B2, and A3_B3 interposed therebetween is defined as a front cutting edge, and AB corresponding to the front cutting edge used for actual cutting Six corner portions where one of the downwardly inclined taper surface 4a and the BA downwardly inclined taper surface 4b is a rake face and the other is a front relief surface, and the ridgelines 40a and 40b as main cutting edges and the ridgeline 40c as a front cutting edge intersect. All of 41a to 41f are chamfered for the purpose of preventing chipping during cutting. The chamfering may be a general chamfering or a combined chamfering appropriately combining R chamfering and C chamfering.

3 to 5 show a face milling cutter 7 in which the cutting insert 1 according to the embodiment is vertically mounted on the outer peripheral surface of the tool body 6.
The tool body 6 has a substantially disk shape, and a plurality of insert mounting portions 8, 8... Are formed at equal intervals on the outer peripheral surface, and the cutting insert 1 is mounted on the insert mounting portion 8. .

  The insert mounting portion 8 includes an abutment wall 9 that abuts the A surface 2 or the B surface 3 of the cutting insert 1 and two constraining walls 10 a and 10 b that constrain the side surface 4 of the cutting insert 1. These two restraining walls 10a and 10b are inclined (specifically, the gap between the two gradually increases toward the cutting side (lower side in FIG. 3) when viewed from the outer peripheral side of the tool body 6 as shown in FIG. Has an inclination extending at the same angle as the inner angle α of the A surface 2 or B surface 3 of the cutting insert 1 and overhanging taper engagement walls 11a and 11b (see an enlarged view of FIG. 5). It is what has.

On the other hand, when the cutting insert 1 makes the B surface 3 abut against the abutting wall 9 of the insert mounting portion 8, for example, the BA downwardly inclined taper surface 4b that intersects the B surface 3 at an acute angle β It is inclined at an obtuse angle with respect to 9. The two restraining walls 10a and 10b of the insert mounting portion 8 are set in position and shape so that the two surfaces of the BA downwardly inclined taper surface 4b and the engagement walls 11a and 11b of the overhang taper are exactly aligned. .
Therefore, if the cutting insert 1 is attached to the insert mounting portion 8, the screw 12 is inserted into the central through hole 5, and the screw 12 is tightened into a female screw hole (not shown) of the contact wall 9, 2 For example, a BA downwardly inclined taper surface 4b that is inclined at an obtuse angle with respect to the abutting wall 9 on the two constraining walls 10a and 10b (conversely, when the A surface 2 is abutted against the abutting wall 9, the AB is inclined downwardly. The two surfaces of the tapered surface 4a) are securely engaged and firmly fixed.
In addition, two surfaces, for example, a BA downward inclined taper surface 4b that is inclined at an obtuse angle with respect to the abutting wall 9 of the cutting insert 1, and engagement walls 11a and 11b of the constraint walls 10a and 10b of the tool body 6 are as follows: Since the dovetail is engaged like a dovetail and ant tenon, the centrifugal force acting on the cutting insert 1 during cutting can be reliably received by the two restraining walls 10a and 10b. Therefore, the risk that the cutting insert is scattered by the centrifugal force during cutting can be reduced.
The two restraining walls 10a and 10b are formed with relief grooves 13 at the base end portions of the engaging walls 11a and 11b, and the relief grooves 13 are formed with the main cutting edges as the ridge lines 40a and 40b of the cutting insert 1. The tip comes to face. By doing so, the main cutting edge can be protected because it does not hit the insert mounting portion 8, and the AB downwardly inclined tapered surface 4a or the BA downwardly inclined tapered surface 4b and the engagement walls 11a and 11b can be protected. The hitting can be made more reliable.

  When the front milling cutter 7 configured as described above is rotated at high speed in the direction indicated by the arrow R in FIGS. 3 to 5, the workpiece is cut at the corner portion 41 a of the cutting insert 1. If the cutting insert 1 has a reduced sharpness or a cutting edge damage such as a chipping, the direction of the corresponding cutting insert 1 is rotated by 120 ° or turned over to replace the used corner portion 41a. It can be changed to any of the five corner portions 41b to 41f.

Although not shown, the cutting insert 1 of the present invention can also be used as a boring cutting tool by being mounted on the same insert mounting portion provided at the tip of a cylindrical tool body.
Further, the cutting insert 1 of the present invention is used as a turning tool (for example, a cutting tool) by mounting it on the same insert mounting portion provided at the tip of a prismatic tool body (for example, a cutting tool holder) although not shown. You can also

As described above, the embodiment of the present invention has been described. However, in the above description, the distinction between the A plane 2 and the B plane 3 is based on convenience of explanation, and has no other meaning.
The present invention is not limited to the above embodiment. For example, in the embodiment, the through-hole 5 is provided in the cutting insert 1 and is attached to the insert mounting portion 8 with the screw 12 passed through the through-hole 5. The cutting insert 1 may be attached to the insert mounting portion 8 with the pressing mechanism.
Moreover, although ceramic material was illustrated as a material of the cutting insert 1 in embodiment, you may form with materials, such as a cemented carbide, a coated cemented carbide, a cermet other than that. However, ceramic materials can exhibit excellent performance in a high-speed cutting area, but have weaknesses that are inferior in the performance of sintered skin, ease of processing, bending strength, etc. compared to other materials. This technique can sufficiently cover these weaknesses of ceramic materials, and therefore the greatest benefit is obtained when the cutting insert of the present invention is implemented with ceramic materials.

3 to FIG. 5, the cutting insert 1 is inserted into a corner angle x = 5 ° to 45 °, an axial rake angle y = 0 ° to 15 °, and a radial rake angle z = 0 ° to 15 °. And is attached to the insert mounting portion 8.
By setting both the axial rake angle and the radial rake angle positive as in this embodiment, the cutting resistance can be kept low, the processing strain is reduced, and the occurrence of burrs and edge cracks at the end of cutting is suppressed. Can do.
Further, since the positively arranged rake face is flat, chip clogging is difficult to occur and the cutting conditions (particularly the feed amount) can be freely selected without being affected by the difference in workpiece material.
In addition, since the cutting edge does not overhang from the insert mounting portion 8, there is a low possibility of breakage, and there is a risk that the unused cutting edge will be hit by cutting waste discharged during cutting. Can be reduced.

  The cutting insert 1 of an Example is formed with the ceramic material, and the A surface 2, the B surface 3, and the side surface 4 have become the sintered skin of the grinding surface. In this way, the cutting performance is stabilized by making the cutting-participating surface a ground surface. In addition, since the contact surface with the insert mounting portion 8, the cutting edge, and the cutting edge are all ground surfaces, the repetition accuracy of the cutting edge is excellent.

DESCRIPTION OF SYMBOLS 1 ... Cutting insert 2 ... A surface 3 ... B surface 4 ... Side surface 4a ... AB downward inclination taper surface (rake face or front relief surface)
4b ... BA downwardly tapered surface (rake face or front flank face)
40a ... Ridge (main cutting edge)
40b ... Ridge line (main cutting edge)
40c ... Ridge (front cutting edge)
41a-41f ... corner part 7 ... front milling cutter 8 ... insert mounting part 9 ... abutting wall 10a, 10b ... constraining wall 11a, 11b ... engagement wall 6 ... tool body x ... corner angle y ... axial rake angle z ... radial Rake angle A1-A3, B1-B3 ... vertex

Claims (9)

A flat plate-shaped cutting insert having an A surface, a B surface, and a side surface,
The A plane and the B plane are approximate triangular shapes in which three vertices having an inner angle α of 70 ° to 85 ° satisfy a three-fold symmetry relationship,
The side surfaces intersect with the A surface at an acute angle β greater than 70 ° and smaller than 85 ° and intersect with the B surface at an obtuse angle κ of (180 ° −β), and the B surface The BA downwardly inclined tapered surface that intersects at the acute angle β and intersects the A surface at the obtuse angle κ is formed so as to be adjacent to each other with the vertices sandwiched therebetween, and is also adjacent between the vertices. A total of six surfaces are alternately combined, and the AB downwardly inclined taper surface and the BA downwardly inclined taper surface are provided with a taper inclined upward toward the center between the vertices.
A ridge line where the A surface and the AB downward tapered surface intersect or a ridge line where the B surface and the BA downward tapered surface intersect as a main cutting edge,
The A surface or the B surface is a lateral relief surface,
A ridge line where the AB downwardly inclined taper surface and the BA downwardly inclined taper surface adjacent to each other with the apex interposed therebetween is defined as a front cutting edge,
One of the AB downwardly inclined tapered surface and the BA downwardly inclined tapered surface corresponding to the front cutting edge is used as a rake face, and the other is used as a front flank.
Furthermore, the corner part where the said main cutting edge and the said front cutting edge cross | intersect is R chamfering and / or C chamfering, The cutting insert characterized by the above-mentioned.   2. The cutting insert according to claim 1, wherein the cutting insert is made of a ceramic material, and at least the AB downwardly tapered surface and the BA downwardly tapered surface are formed by grinding. A face milling cutter that attaches the cutting insert according to claim 1 or 2 to a plurality of insert mounting portions provided on an outer peripheral surface of a tool body and rotates the shaft integrally with the tool body,
The insert mounting portion is
An abutting wall that abuts the A or B surface of the cutting insert;
Two constraining walls that constrain the side surface,
Further, the two constraint walls have an inclination in which an interval between the two constraining walls gradually increases toward the cutting side when viewed from the outer peripheral side of the tool body, and an engagement wall having an overhang taper at an inward edge of each other. Is,
On the other hand, in the cutting insert, when the A surface is brought into contact with the abutting wall of the insert mounting portion, the AB inclined taper surface or the B surface which becomes an obtuse angle with the corresponding contacting wall or the B surface of the insert mounting portion. Two surfaces of a BA downwardly inclined tapered surface that becomes obtuse with the corresponding wall when being brought into contact with the contact wall are engaged with the engagement walls of the two restraint walls of the insert mounting portion. Front milling cutter. A face milling cutter that attaches the cutting insert according to claim 1 or 2 to a plurality of insert mounting portions provided on an outer peripheral surface of a tool body and rotates the shaft integrally with the tool body,
The insert such that the A-side or the B-side is the outer peripheral side and the corner angle x = 5 ° to 45 °, the axial rake angle y = 0 ° to 15 °, and the radial rake angle z = 0 ° to 15 °. A front milling cutter characterized by being mounted on a mounting portion. A face milling cutter that attaches the cutting insert according to claim 1 or 2 to a plurality of insert mounting portions provided on an outer peripheral surface of a tool body and rotates the shaft integrally with the tool body,
The insert such that the A-side or the B-side is the outer peripheral side and the corner angle x = 5 ° to 45 °, the axial rake angle y = 0 ° to 15 °, and the radial rake angle z = 0 ° to 15 °. The front milling cutter according to claim 3, wherein the front milling cutter is mounted on a mounting portion.   A cutting tool for boring, wherein the cutting insert according to claim 1 or 2 is attached to an insert mounting portion provided at a tip of a tool body. The insert mounting portion is
An abutting wall that abuts the A or B surface of the cutting insert;
Two constraining walls that constrain the side surface,
Further, the two constraint walls have an inclination in which an interval between the two constraining walls gradually increases toward the cutting side when viewed from the outer peripheral side of the tool body, and an engagement wall having an overhang taper at an inward edge of each other. Is,
On the other hand, in the cutting insert, when the A surface is brought into contact with the abutting wall of the insert mounting portion, the AB inclined taper surface or the B surface which becomes an obtuse angle with the corresponding contacting wall or the B surface of the insert mounting portion. Two surfaces of a BA downwardly inclined tapered surface that becomes obtuse with the corresponding wall when being brought into contact with the contact wall are engaged with the engagement walls of the two restraint walls of the insert mounting portion. The boring cutting tool according to claim 6.   A cutting tool for turning, wherein the cutting insert according to claim 1 or 2 is attached to an insert mounting portion provided at a tip of a tool body. The insert mounting portion is
An abutting wall that abuts the A or B surface of the cutting insert;
Two constraining walls that constrain the side surface,
Further, the two constraint walls have an inclination in which an interval between the two constraining walls gradually increases toward the cutting side when viewed from the outer peripheral side of the tool body, and an engagement wall having an overhang taper at an inward edge of each other. Is,
On the other hand, in the cutting insert, when the A surface is brought into contact with the abutting wall of the insert mounting portion, the AB inclined taper surface or the B surface which becomes an obtuse angle with the corresponding contacting wall or the B surface of the insert mounting portion. Two surfaces of a BA downwardly inclined tapered surface that becomes obtuse with the corresponding wall when being brought into contact with the contact wall are engaged with the engagement walls of the two restraint walls of the insert mounting portion. The cutting tool for turning according to claim 8.

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