JP2016163910A - Cutting insert, tool body and cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly fix a cutting insert to a cutting tool.SOLUTION: A cutting insert includes two end surfaces and lateral face connecting the end surfaces, in which at least one cutting edge is formed at the cross ridge line between at least one end surface and the lateral face. When designating one cutting edge as the first cutting edge, an end surface having the first cutting edge formed thereon as the first end surface, and the other end surface as the second end surface, the lateral face includes at least a protrusion side surface portion. The protrusion side surface portion protrudes outward as it goes from the first end surface to the second end surface. When viewed from a direction facing the first end surface, the first protrusion side surface portion protrudes outward as it is alienated from the first cutting edge.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cutting insert that is detachably mounted on a cutting tool, a tool body for mounting the cutting insert, and a cutting tool thereof.

  There exists a thing as shown in patent document 1 in the conventional cutting insert. That is, it is a cutting insert having two end faces and a side face connecting the end faces, and two crossing ridge lines between the end faces and the side faces are formed with two cutting edges on one side and a total of four cutting edges on both sides. The side surface has a side surface portion that indents inward once and then protrudes outwardly from the end surface on the side where one of the cutting blades is formed toward the other end surface. The side surface portion has a flat surface that comes into contact with the wall surface of the chip seat in the cutting tool. However, in plan view, the plane does not have a shape that protrudes outward as it is separated from the one cutting edge specified in the foregoing. Patent Document 1 discloses a tool body and a cutting tool for detachably mounting the cutting insert.

International Publication No. 2012/20784 Pamphlet

  The cutting insert of Patent Document 1 has a certain effect as a technique for fixing the cutting insert so that it does not move when the cutting insert is mounted on a cutting tool. However, in some cases, such as when trying to apply to a rotary cutting tool with a small tool diameter, it is still insufficient. The present invention is to more firmly fix a cutting insert to a cutting tool.

  The cutting insert of this invention is a cutting insert which has two end surfaces and the side surface which connects those end surfaces, Comprising: At least 1 cutting edge is formed in the intersection ridgeline of at least 1 end surface and a side surface. When one of the cutting edges is the first cutting edge, the end face on the side where the first cutting edge is formed is the first end face, and the other end face is the second end face. The side surface includes at least a protruding side surface portion. The protruding side surface portion protrudes outward as it goes from the first end surface to the second end surface. In addition, when viewed from the direction facing the first end surface, the protruding side surface portion protrudes outward as it is separated from the first cutting edge.

  The tool body of the present invention is a tool body for detachably mounting a cutting insert, and has at least one tip seat. The chip seat has at least a bottom surface, a wall surface, and an open surface. An inclined wall surface portion is formed on the wall surface. The inclined wall surface portion comes into contact with the mounted cutting insert. The inclined wall portion is recessed inward as it goes from the end away from the bottom surface to the bottom surface. In addition, as viewed from the direction facing the bottom surface, the inclined wall surface portion is recessed inward as the distance from the open surface increases.

  The cutting tool of the present invention includes the cutting insert of the present invention.

  The cutting insert of the present invention is more firmly fixed to the chip seat of the cutting tool. Therefore, the cutting insert is prevented from moving, and problems such as chipping and chipping are prevented. As a result, it can be applied to cutting tools that could not be applied conventionally.

FIG. 1 is a perspective view of a cutting insert according to the first embodiment. FIG. 2 is a perspective view of a cutting tool to which the cutting insert of FIG. 1 is attached. FIG. 3 is a plan view of the cutting insert of FIG. FIG. 4 is a front view of the cutting insert of FIG. FIG. 5 is a right side view of the cutting insert of FIG. FIG. 6 is an explanatory diagram of a virtual plane related to the cutting insert of FIG. 1. FIG. 7 is an enlarged view of a tip seat in the cutting tool of FIG. FIG. 8 is an explanatory diagram of a virtual plane regarding the chip seat of the cutting tool of FIG. FIG. 9 is a front view of the cutting tool of FIG. FIG. 10 is an enlarged cross-sectional view taken along line GG in FIG. FIG. 11 is a schematic diagram of a contact state between the cutting insert and the tip seat in the cutting tool of FIG. 2. FIG. 12 is a second schematic diagram of the contact state between the cutting insert and the tip seat. FIG. 13 is a third schematic diagram of the contact state between the cutting insert and the tip seat. FIG. 14 is a fourth schematic diagram of a contact state between the cutting insert and the tip seat. FIG. 15 is a perspective view of a cutting insert in the second embodiment. FIG. 16 is a plan view of the cutting insert of FIG. FIG. 17 is a front view of the cutting insert of FIG. 18 is a right side view of the cutting insert of FIG.

  An embodiment of a cutting insert to which the present invention is applied will be described with reference to the drawings. FIG. 1 is a perspective view of a cutting insert according to the first embodiment. FIG. 2 is a perspective view of a cutting tool to which the cutting insert of FIG. 1 is attached. FIG. 3 is a plan view of the cutting insert of FIG. FIG. 4 is a front view of the cutting insert of FIG. FIG. 5 is a right side view of the cutting insert of FIG. FIG. 6 is an explanatory diagram of a virtual plane related to the cutting insert of FIG. 1. FIG. 7 is an enlarged view of a tip seat in the cutting tool of FIG. FIG. 8 is an explanatory diagram of a virtual plane regarding the chip seat of the cutting tool of FIG. FIG. 9 is a front view of the cutting tool of FIG. FIG. 10 is an enlarged cross-sectional view taken along line GG in FIG. FIG. 11 is a schematic diagram of a contact state between the cutting insert and the tip seat in the cutting tool of FIG. 2. FIG. 12 is a second schematic diagram of the contact state between the cutting insert and the tip seat. FIG. 13 is a third schematic diagram of the contact state between the cutting insert and the tip seat. FIG. 14 is a fourth schematic diagram of a contact state between the cutting insert and the tip seat. FIG. 15 is a perspective view of a cutting insert in the second embodiment. FIG. 16 is a plan view of the cutting insert of FIG. FIG. 17 is a front view of the cutting insert of FIG. 18 is a right side view of the cutting insert of FIG.

  As shown in FIGS. 1 and 3 to 5, the cutting insert 1 in the first embodiment has a first end surface 2 and a second end surface 3 which are two end surfaces 2 and 3. In order to make the following description easy to understand, the first end face 2 is referred to as an upper face 2. The second end surface 3 is referred to as the lower surface 3. The upper surface 2 and the lower surface 3 are both substantially parallelogram surfaces, and have the same contour shape that is 180 ° rotationally symmetric. The upper surface 2 and the lower surface 3 are connected by the side surface 4 over the entire circumference. Two cutting edges 5 are formed at a part of the intersecting ridge line between the upper surface 2 and the side surface 4. Similarly, two cutting edges 5 are formed at a part of the intersecting ridge line between the lower surface 3 and the side surface 4. The cutting insert 1 has a shape in which the respective cutting edges 5 are rotationally symmetrical by 180 ° in plan view. At the same time, each cutting edge 5 has a 180 ° rotationally symmetric shape even in the rotation direction in which the upper surface 2 and the lower surface 3 are reversed. Therefore, when one acting cutting edge 5 is worn or damaged by using it, the other three cutting edges can be removed by removing the cutting insert 1 and rotating or reversing the cutting insert 1. 5 can be used sequentially. In this way, one cutting insert 1 can be used a total of four times. Although the subsequent description is omitted, the shape of each component is basically formed as a 180 ° rotationally symmetric shape with respect to rotation or inversion in these four directions. Therefore, the upper surface 2 and the lower surface 3 are end surfaces having the same function. That is, this cutting insert 1 is a cutting insert having exactly the same shape even if the upper surface 2 and the lower surface 3 are exchanged. Of course, a degree of asymmetry that does not affect the use is acceptable. For example, in order to identify a corner to be used, asymmetry such as adding a number such as 1 to 4 or a mark in the vicinity of each cutting edge 5 is allowed. For the following description, for convenience, one cutting edge 5 on the upper surface 2 side is referred to as a first cutting edge 5a. That is, the lower left cutting edge 5 in FIG. 3 is referred to as a first cutting edge 5a. Hereinafter, the case where the 1st cutting edge 5a is used as the cutting edge 5 which acts at the time of cutting is demonstrated. The use of the other three cutting edges 5 as the acting cutting edge 5 is the same as the case where the first cutting edge 5a is used, and thus the description thereof is omitted.

  As shown in FIG. 2, the cutting tool 20 of this embodiment is a rotary cutting tool 20 capable of performing right-angle wall surface processing. In other words, it is a shoulder cutter. The cutting edge 5 has a main cutting edge 6, a secondary cutting edge 7 and a corner cutting edge 8. The first cutting edge 5a has a first main cutting edge 6a, a first sub cutting edge 7a, and a corner cutting edge 8. The main cutting edge 6 is formed on almost all sides on the long side of the cutting insert 1. The main cutting edge 6 is a cutting edge 5 for cutting in the feed direction of the cutting tool 20. The main cutting edge 6 is a cutting edge 5 for cutting the wall surface of the workpiece. The auxiliary cutting edge 7 is formed on a part of the short side of the cutting insert 1. The secondary cutting edge 7 is a cutting edge 5 in a direction substantially parallel to the feed direction of the cutting tool 20. The auxiliary cutting edge 7 is a cutting edge 5 for cutting so as to expose the surface of the workpiece. The auxiliary cutting edge 7 is also called a front edge. The secondary cutting edge 7 may be formed with a wiping edge or the like as necessary. A corner blade 8 is formed at a corner between the main cutting edge 6 and the auxiliary cutting edge 7. The main cutting edge 6, the corner edge 8 and the auxiliary cutting edge 7 constitute a series of cutting edges 5. The first main cutting edge 6a, the corner edge 8 and the first auxiliary cutting edge 7a constitute a series of first cutting edges 5a. In this embodiment, the radius of curvature of the corner blade 8 is about 0.4 mm. The length of the long side of the cutting insert 1 was about 9 mm. The length of the short side of the cutting insert 1 was about 5 mm. The thickness of the cutting insert 1 was about 3 mm. The thickness in this case is the distance between the upper surface 2 and the lower surface 3. However, it is not limited to these dimensions. The dimension of the contour shape of the cutting insert 1 can be appropriately changed according to the shape and size of the workpiece to be processed, the tool diameter of the cutting tool 20, and the like.

  The tool diameter of the cutting tool 20 was about 14 mm in diameter. In the conventional rotary cutting tool, the tool diameter is about 16 mm due to limitations such as the clamping strength of the cutting insert, and it is difficult to make the tool diameter smaller than that. According to the present invention, the clamping rigidity of the cutting insert 1 is greatly increased, so that the cutting tool 20 having a tool diameter of 15 mm or less can be realized by exceeding the limit of the prior art. More specifically, an end mill with a tool diameter of about 14 mm capable of machining a right-angle wall surface can be realized. The present invention is particularly suitable for a rotary cutting tool having a tool diameter of 40 mm or less. Especially, it is suitable for a small diameter rotary cutting tool having a tool diameter of 20 mm or less. In a rotary cutting tool having a tool diameter of 20 mm or less, a cutting tool using a cutting insert that can use both the upper surface 2 and the lower surface 3 can be realized. That is, a rake face having a positive rake angle can be provided on both the upper surface 2 and the lower surface 3. In the case of a cutting insert having rake surfaces on both sides, the upper surface 2 and the lower surface 3 need to be provided with a rake surface continuous from the cutting edge 5 and a seating surface that sits on the bottom surface of the chip seat when reversed. Therefore, especially in the case of cutting inserts for small-diameter rotary cutting tools, the dimensions of the cutting inserts are small. Therefore, if the required rake face is secured, the seating surface area becomes very small and the cutting insert cannot be fixed. Cheap. The cutting insert 1 and the cutting tool 20 of the present invention enable the cutting insert 1 to be firmly fixed even if the seating surface area is narrow, and the rotary cutting tool 20 having a small tool diameter exceeds the limit of conventional cutting tools. Can be realized. For the shape of the rake face, various conventional techniques such as providing a chip breaker can be applied.

  The cutting insert 1 has a hole penetrating the center of the upper surface 2 and the lower surface 3. This hole is used when the cutting insert 1 is fixed to the cutting tool 20. Both ends of the hole are made to have a larger diameter than the center of the hole. In this embodiment, the cutting insert 1 is fixed to the cutting tool 20 with a fixing screw. The diameter enlarged portion of the hole has a shape corresponding to the head of the fixing screw, and the head of the fixing screw contacts. However, it is not limited to this. Various conventional techniques can be applied to the method of fixing the cutting insert 1 to the cutting tool 20. For example, it may be a cutting insert without a hole and may be fixed to a cutting tool by a fixing member such as a wedge.

  As seen in FIG. 1, a protruding side surface portion 9 is formed on the side surface 4 of the cutting insert 1. When the cutting insert 1 is mounted on the cutting tool 20, the protruding side surface portion 9 of the cutting insert 1 fixes the cutting insert 1 by contacting an inclined wall surface 24 formed on the wall surface 23 of the chip seat of the cutting tool 20. . When the first cutting edge 5a acts as the cutting edge 5, the projecting side face portion 9 that acts is defined as the first projecting side face portion 9a. In FIG. 3, the 1st protrusion side surface part 9a regarding the lower left 1st cutting edge 5a is formed in the lower right. The protruding side surface portion 9 protrudes outward from one end surface to which the working cutting edge 5 belongs to the other end surface. That is, when the first cutting edge 5a on the upper surface 2 side acts, the first projecting side surface portion 9a projects outward from the upper surface 2 toward the lower surface 3. The protruding side surface portion 9 is an inclined surface. Assuming that the plane in contact with the protruding side surface portion 9 is the virtual plane A and the plane in contact with the lower surface 3 is the virtual plane B, the virtual plane A and the virtual plane B intersect with each other at an acute angle. Here, the virtual planes in contact with each surface are compared, but strictly speaking, the virtual planes may be in contact with each other at the contact portion. Of the protruding side surface portion 9, the portion that does not contact the wall surface 23 of the chip seat may have any shape. Therefore, the protruding side surface portion 9 may not be a flat surface. When the protruding side surface portion 9 is formed so as to protrude outward in this manner, a force that presses the cutting insert 1 toward the bottom surface 22 side of the chip seat works, and the cutting insert 1 is prevented from floating and moving.

  The first protruding side surface portion 9a is formed on a surface opposite to the surface including the flank of the first auxiliary cutting edge 7 when the end surfaces 2 and 3 are regarded as a square and the side surface 4 is divided into four surfaces. The However, the protruding side surface portion 9 is formed at a position shifted from the flank surface of the auxiliary cutting edge 7. As described above, the cutting insert 1 is 180 ° rotationally symmetric with respect to the center of the upper surface 2. Accordingly, the two secondary cutting edges 7 are formed at diagonal positions with respect to the two directions. The first protruding side surface portion 9a is close to the first main cutting edge 6a and opposite to the first sub cutting edge 7a and the series of corner blades 8 with respect to the first cutting edge 5a acting at the time of cutting. It is formed. For this reason, the movement which the other side of the cutting insert 1 tries to float up by the cutting force which acts on the 1st sub cutting edge 7a and a series of corner blades 8 is suppressed effectively by the 1st protrusion side surface part 9a. Can do.

  Next, the third side surface portion 11 will be described. A side surface portion connected to a side facing the first main cutting edge 6a acting at the time of cutting with respect to four sides of a quadrangle in a plan view is referred to as a third side surface portion 11. A plane in contact with the third side surface portion 11 is defined as a virtual plane C. As seen in FIG. 3, the first protruding side surface portion 9a protrudes outward in plan view as it is separated from the first main cutting edge 6a which is a part of the acting first cutting edge 5a. To do. That is, the first protruding side surface portion 9a intersects the third side surface portion 11 facing the first main cutting edge 6a at an acute angle in plan view. The virtual plane A in contact with the first protruding side surface portion 9a and the virtual plane C in contact with the third side surface portion 11 intersect at an acute angle at the inner angle. For this reason, the 1st protrusion side surface part 9a also suppresses the movement of the direction which tries to rotate the cutting insert 1 within a plane with the cutting force concerning the 1st main cutting edge 6a and a series of corner cutting edges 8 side. To do. That is, since both the first protruding side surface portion 9a and the third side surface portion 11 are in contact with the wall surface 23 of the chip seat, the movement in the direction in which the cutting insert 1 is rotated in the plane can be firmly suppressed. .

  The protruding side surface portion 9 is formed as a substantially flat surface. If the protruding side surface portion 9 is a flat surface, it is easy to form with high accuracy, and it is easy to make contact with the inclined wall surface 24 of the wall surface 23 of the chip seat over a wide area. The protruding side surface portion 9 can further stabilize the clamping performance of the cutting insert 1 when it is a ground grinding surface. However, it is not limited to this. The protruding side surface portion 9 of the cutting insert 1 of this embodiment was a flat surface formed by powder pressure molding and sintering.

  The second side surface portion 10 is formed on the lower surface 3 side of the side surface 4 with respect to the first protruding side surface portion 9a. As described above, the lower surface 3 is the lower surface 3 with respect to the upper surface 2 on which the first cutting edge 5a that acts during cutting is formed. That is, the lower surface 3 side is a seating surface side seated on the bottom surface 22 of the chip seat. In this embodiment, the second side surface portion 10 also serves as a flank of the auxiliary cutting edge 7 when the cutting edge 5 on the lower surface 3 side acts. The second side surface portion 10 protrudes outward from the first protruding side surface portion 9a. Accordingly, the auxiliary cutting edge 7 formed on the lower surface 3 is formed at a position away from the first protruding side surface portion 9a. Therefore, even if the rake face is secured with a necessary width, the width of the seating surface on the back surface of the first protruding side surface portion 9a is secured. In combination with the projecting side surface portion 9 being an inclined surface, the cutting insert 1 is firmly sandwiched between the first projecting side surface portion 9a and the seating surface, and the clamping performance of the cutting insert 1 is stabilized. In this embodiment, the second side surface portion 10 is an inclined surface, and includes a portion in which the inclination angle protruding outward is larger than that of the first protruding side surface portion 9a.

  As shown in FIGS. 2 and 7 to 8, the cutting tool 20 of this embodiment has two tip seats for mounting the cutting insert 1. In this embodiment, two chip seats are provided and two cutting inserts 1 are mounted. However, the present invention is not limited to this. In this case, the number of chip seats corresponds to the number of blades of the cutting tool 20. The number of chip seats is adjusted in a timely manner according to the tool diameter of the cutting tool 20 and the required processing efficiency. In this embodiment, the two chip seats are formed in the same shape and in an equal arrangement. However, it is not limited to this. Various conventional techniques can be applied to the arrangement method of the plurality of chip seats.

  Each chip seat has a bottom surface 22 of the chip seat and a wall surface 23 of the chip seat. The seating surface of the upper surface 2 or the lower surface 3 of the cutting insert 1 abuts on the bottom surface 22 of the chip seat. The bottom surface 22 of the chip seat was a single plane. However, it is not limited to this. The bottom surface 22 of the chip seat may be formed in any shape as long as it can contact the seating surface of the cutting insert 1. Of course, it is desirable that the bottom surface 22 of the chip seat is located directly below the first cutting edge 5a that acts during cutting. Therefore, when viewed from the direction facing the bottom surface 22 of the chip seat, the contour shape of the bottom surface 22 of the chip seat is preferably a substantially parallelogram. In addition, a dullness etc. may be formed in the boundary part with the wall surface 23 of a chip seat around the bottom face 22 of a chip seat. In this case, the true contour shape of the bottom surface 22 of the chip seat does not need to be sticking to a substantially parallelogram, for example, when the shape of the shading is complicated. The contour shape of the bottom surface 22 of the chip seat described here is a contour shape corresponding to the contour shape of the cutting insert 1 and has been described without considering the shape of the dullness.

  The wall surface 23 of the chip seat has at least an inclined wall surface portion 24. As shown in the sectional view of FIG. 10, the inclined wall surface portion 24 abuts on the first protruding side surface portion 9 a of the cutting insert 1. The inclined wall surface portion 24 is recessed inward from the end portion away from the bottom surface 22 of the chip seat toward the bottom surface 22. That is, the inclined wall surface portion 24 is inclined so as to be recessed inwardly from the upper side toward the bottom surface 22. The inclined wall surface portion 24 was an inclined plane. Here, as shown in FIG. 8, a plane in contact with the inclined wall surface portion 24 is a virtual plane D. A plane in contact with the bottom surface 22 of the chip seat is defined as a virtual plane E. The virtual plane D and the virtual plane E intersect at an acute angle at the inner angle. FIG. 11 schematically shows a contact state between the cutting insert 1 and the tip seat of this embodiment. The fact that the virtual plane D and the virtual plane E intersect at an acute angle at the inner angle means that the angle α in FIG. 11 is smaller than 90 °. When the inclined wall surface portion 24 is formed in such a shape, there is an effect of pressing the cutting insert 1 against the bottom surface 22 side of the chip seat when a force in the direction of lifting from the chip seat is applied to the cutting insert 1 by cutting. Therefore, the clamping property of the cutting insert 1 is stabilized, and the cutting insert 1 is suppressed from moving.

  As described above, when the contour shape of the bottom surface 22 of the chip seat is a substantially parallelogram, the chip seat included in the side adjacent to the side related to the inclined wall surface portion 24 among the four sides of the parallelogram. A portion of the wall surface 23 is referred to as a third wall surface portion 26. The third wall surface portion 26 is a wall surface portion facing the first main cutting edge 6a on which the cutting insert 1 acts during cutting. Therefore, the third wall surface portion 26 can also be called a main restraint wall surface portion. A plane in contact with the third wall surface portion 26 is defined as a virtual plane F. The virtual plane D in contact with the inclined wall surface portion 24 and the virtual plane F in contact with the third wall surface portion 26 intersect at an acute angle at the inner angle.

  The wall surface 23 of the chip seat has a second wall surface portion 25 near the inclined wall surface portion 24. The second wall surface portion 25 is recessed inward from the inclined wall surface portion 24. When using the cutting tool 20 and the cutting insert 1, the second wall surface portion 25 of the tip seat does not contact the second side surface portion 10 of the cutting insert 1. That is, the second wall surface portion 25 is escaped by indenting inward in order to ensure that the inclined wall surface portion 24 is in contact with the cutting insert 1. Thereby, when it is not a flank which the 2nd side surface part 10 of the cutting insert 1 acts on, the 2nd side surface part 10 is protected by not contacting the 2nd wall surface part 25. FIG. That is, the cutting insert 1 is prevented from being damaged when not in use.

  For example, as schematically shown in FIG. 12, the protruding side surface portion 9 of the cutting insert 1 may be a curved surface that bulges outward. The curved surface that bulges outward is obtained, for example, by making a cross-sectional shape cut perpendicularly to the upper surface 2 into a curve that bulges outward. On the other hand, a curved surface that bulges outward can also be obtained by making a cross-sectional shape cut parallel to the upper surface 2 into a curve that bulges outward. As shown in FIG. 12, when the first protruding side surface portion 9 a is a curved cross-sectional shape cut perpendicularly to the upper surface 2, the inclination angle becomes larger as it approaches the upper surface 2, and the intersection angle with the upper surface 2 becomes dull. Become. That is, the crossed ridge line with the upper surface 2 is not easily chipped. On the other hand, although not shown, the first projecting side surface portion 9a intersects with the first main cutting edge 6a as it approaches the first main cutting edge 6a when the cross-sectional shape cut in parallel with the upper surface 2 is a curve. The angle becomes dull. That is, the second corner that is the intersection with the first main cutting edge 6a is not easily chipped. Further, the first protruding side surface portion 9a can be prevented from coming into contact with the inclined wall surface portion 24 at the corner portion, and problems such as chipping of unused portions of the cutting insert 1 and plastic deformation of the inclined wall surface portion 24 can be prevented. In this embodiment, the cutting edge 5 is not formed at the second corner. Therefore, it is suitable that the second corner has a strong shape that does not lack.

  Further, as schematically shown in FIG. 13, the protruding side surface portion 9 can be a curved surface that is recessed inward. The curved surface that dents inward is obtained, for example, by making a cross-sectional shape cut perpendicularly to the top surface 2 into a curve that dents inward. On the other hand, a curved surface that is recessed inward can also be obtained by making a cross-sectional shape cut in parallel with the upper surface 2 into a curve that is recessed inward. As shown in FIG. 13, when the first protruding side surface portion 9 a is a curved cross-sectional shape cut perpendicular to the upper surface 2, the inclination angle becomes smaller as it approaches the upper surface 2, and the intersection angle with the upper surface 2 becomes smaller. Become. That is, the area of the upper surface 2 where the cutting edge 5 can be formed can be expanded. Further, the inclined wall surface portion 24 that comes into contact with the cutting insert 1 is the uppermost wall surface. Therefore, the effect of pressing the cutting insert 1 is maximized. On the other hand, although not shown, when the first projecting side surface portion 9a has a cross-sectional shape cut in parallel to the upper surface 2, the both sides in the width direction of the first projecting side surface portion 9a project. become. For this reason, the both sides of the width direction of the 1st protrusion side surface part 9a can always be contact | abutted with the wall surface 23 of a chip seat, and the movement of the rotation direction within the plane of the cutting insert 1 can be suppressed effectively. .

  When the distance between the first protruding side surface portion 9a and the first protruding side surface portion 9a is measured with reference to the virtual plane B in contact with the lower surface 3, the distance to the first protruding side surface portion 9a is constant. It was. However, it is not limited to this. That is, the distance to the first protruding side surface portion 9a may be provided so as to change. In other words, the height of the contact portion of the first protruding side surface portion 9a may be provided so as to change. For example, the distance to the first protruding side surface portion 9a increases as the distance from the first main cutting edge 6a of the acting first cutting edge 5a increases from the first main cutting edge 6a. May be. When the first protruding side surface portion 9a is formed in this way, the first protruding side surface portion 9a is formed at a position closer to the lower surface 3 as it is closer to the first main cutting edge 6a. For example, by using the first main cutting edge 6a, even if the vicinity of the upper surface 2 of the second corner is damaged by scraping or collision of the chips, the influence is affected by the first protruding side surface portion 9a or the inclined wall surface. It is possible to prevent reaching the portion 24. Therefore, the clamping performance of the cutting insert 1 can be further stabilized.

  For example, the distance to the first projecting side surface portion 9a may be such that the distance to the first projecting side surface portion 9a decreases as the distance from the first main cutting edge 6a increases. When the first projecting side surface portion 9a is formed in this way, the first projecting side surface portion 9a is formed at a position farther from the lower surface 3 as it is farther from the first main cutting edge 6a. When the first projecting side surface portion 9a is formed in this manner, for example, the cutting force applied to the corner cutting edge 8 effectively suppresses the diagonal position of the cutting insert 1 from moving upward. be able to.

  As schematically shown in FIG. 14, the inclined wall surface portion 24 of the tip seat of the tool body 21 can also be a curved surface. As shown in FIG. 14, when the inclined wall surface portion 24 is a curved surface that bulges outward, the contact with the cutting insert 1 can be made in-plane, not in the corner. When the inclined wall surface portion 24 is formed in this manner, problems such as plastic deformation of the inclined wall surface portion 24 can be prevented. Although not shown, conversely, the inclined wall surface portion 24 may be a curved surface that is recessed inward. When the inclined wall surface portion 24 is formed in this way, the cutting insert 1 can be pressed near the upper end of the inclined wall surface portion 24, so that the effect of suppressing the lifting of the cutting insert 1 is maximized. The contact position of the inclined wall portion 24 with the cutting insert 1 can change the distance from the bottom surface 22 of the chip seat. When the inclined wall surface portion 24 is formed as described above, when the height of the first protruding side surface portion 9a of the cutting insert 1 is changed as described above, the height of the inclined wall surface portion 24 can be made to correspond. .

  The cutting insert 1 in 2nd Embodiment is shown in FIGS. 15-18. About the same structure as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. The cutting insert 1 and the cutting tool 20 in this embodiment are the cutting insert 1 and the cutting tool 20 for a high-feed cutter. Therefore, the crossing angle between the main cutting edge 6 and the auxiliary cutting edge 7 is a large obtuse angle. In this embodiment, the crossing angle between the main cutting edge 6 and the sub-cutting edge 7 is about 160 ° in plan view. The tool body 21 of the cutting tool 20 is the same as the tool body 21 in the first embodiment described above. The tool body 21 of this embodiment has a shape that can be used for both types of cutting inserts 1. Of course, it is not limited to this. In each embodiment, a dedicated tool body 21 may be used.

  The cutting insert 1 is made of cemented carbide, cermet, ceramics and cubic boron nitride, or a material coated with a hard material surface, or a sintered material such as diamond. It is a body material.

  These cutting inserts can be applied to various cutting tools, and can be used for cutting of steel or the like by attaching the cutting tool to a machine tool. Any cutting insert having a main cutting edge and a sub cutting edge can be applied to most cutting tools.

  The cutting insert, tool body, and cutting tool of the present invention are not limited to the above-described embodiments, and various modifications and additions can be made without departing from the gist of the present invention. For example, the present invention can be applied to a triangular or hexagonal or more polygonal cutting insert.

1 Cutting insert 2 First end face (upper surface)
3 Second end face (lower face)
4 side surface 5 cutting edge 5a first cutting edge 6 main cutting edge 6a first main cutting edge 7 sub cutting edge 7a first sub cutting edge 8 corner cutting edge 9 protruding side surface portion 9a first protruding side surface portion 10 first 2 side surface portions 11 third side surface portion 12 fourth side surface portion 20 cutting tool 21 tool body 22 bottom surface 23 of chip seat 24 wall surface 24 of tip seat 25 inclined wall surface portion 26 second wall surface portion 26 third wall surface portion A 1 virtual plane B 2nd virtual plane C 3rd virtual plane D 4th virtual plane E 5th virtual plane F 6th virtual plane

Claims (16)

A cutting insert (1) having two end faces (2, 3) and a side face (4) connecting the end faces (2, 3),
At least one cutting edge (5) is formed on the intersecting ridge line of at least one of the end faces (2, 3) and the side face (4),
One of the cutting edges (5) is a first cutting edge (5a), the end face (2) on the side where the first cutting edge (5a) is formed is a first end face (2), When the other end surface (3) is the second end surface (3),
Said side surface (4) comprises at least a protruding side surface portion (9),
The protruding side surface portion (9) protrudes outward from the first end surface (2) toward the second end surface (3),
Further, as viewed from the direction facing the first end surface (2), the protruding side surface portion (9) is a cutting insert that protrudes outward as it is separated from the first cutting edge (5a).   The cutting insert according to claim 1, wherein at least one of the cutting edges (5) is also formed on an intersecting ridge line between the second end face (3) and the side face (4). The protruding side surface portion (9) is an inclined surface,
A plane in contact with the inclined surface is a first virtual plane (A), and a plane in contact with the second end surface (3) is a second virtual plane (B).
The cutting insert according to claim 1 or 2, wherein the first virtual plane (A) and the second virtual plane (B) intersect at an acute angle at an internal angle. The cutting edge (5) includes at least a main cutting edge (6) and a secondary cutting edge (7), and the main cutting edge (6) of the first cutting edge (5a) is a first main cutting edge ( 6a), and when the sub cutting edge (7) of the first cutting edge (5a) is the first sub cutting edge (7a),
When viewed from the direction facing the first end surface (2), the contour shape of the cutting insert (1) is a substantially parallelogram,
Of the four sides of the parallelogram, the side surface (4) connected to the side facing the side including the first main cutting edge (6a) is defined as a third side surface portion (11). ,
The protruding side surface portion (9) is included in a fourth side surface portion (12) which is a portion of the side surface (4) connected to a side facing the side including the first sub cutting edge (7a),
The protruding side surface portion (9) is an inclined surface,
If the plane in contact with the inclined surface is the first virtual plane (A) and the plane in contact with the third side surface portion (11) is the third virtual plane (C),
The cutting insert according to any one of claims 1 to 3, wherein the first virtual plane (A) and the third virtual plane (C) intersect at an acute angle at an internal angle.   The cutting insert according to any one of claims 1 to 4, wherein the protruding side surface portion (9) is a flat surface.   The cutting insert according to any one of claims 1 to 4, wherein the protruding side surface portion (9) is a curved surface that bulges outward.   The cutting insert according to any one of claims 1 to 4, wherein the protruding side surface portion (9) is a curved surface that is recessed inward. When a plane in contact with the second end surface (3) is a second virtual plane (B),
When measuring the distance to the protruding side surface portion (9) with reference to the second imaginary plane (B), the protruding side surface portion (9) is separated from the first main cutting edge (6a). The cutting insert in any one of Claim 1 to 7 which has a part from which distance to is changed. Said side surface (4) comprises a second side surface portion (10);
The second side surface portion (10) is formed closer to the second end surface (3) than the protruding side surface portion (9), and the second side surface portion (10) is the protruding side surface portion (9). The cutting insert according to any one of claims 1 to 8, which protrudes outward. A tool body (21) for detachably mounting the cutting insert (1),
Having at least one tip seat;
The tip seat has at least a bottom surface (22), a wall surface (23) and an open surface,
An inclined wall surface portion (24) is formed on the wall surface (23), and the inclined wall surface portion (24) is in contact with the mounted cutting insert (1),
The inclined wall surface portion (24) is recessed inward from the end away from the bottom surface (22) toward the bottom surface (22),
In addition, when viewed from the direction facing the bottom surface (22), the inclined wall surface portion (24) is a tool body that indents inward as the distance from the open surface increases. A tool body (21) for detachably mounting the cutting insert (1) according to any one of claims 1 to 9,
If the plane in contact with the inclined wall surface portion (24) is the fourth virtual plane (D) and the plane in contact with the bottom surface (22) is the fifth virtual plane (E),
The tool body according to claim 10, wherein the fourth virtual plane (D) and the fifth virtual plane (E) intersect at an acute angle at an internal angle. A plane in contact with the inclined wall surface portion (24) is a fourth virtual plane (D),
When viewed from the direction facing the bottom surface (22), the contour shape of the bottom surface (22) is a substantially parallelogram, and among the four sides of the parallelogram, the sides related to the inclined wall surface portion (24). And the portion of the wall surface (23) included in the side adjacent to the third wall surface portion (26), and the plane in contact with the third wall surface portion (26) is the sixth virtual plane (F),
The tool body according to claim 10 or 11, wherein the fourth virtual plane (D) and the sixth virtual plane (F) intersect at an acute angle at an internal angle.   The tool body according to any one of claims 10 to 12, wherein the inclined wall surface portion (24) is a flat surface.   The tool body according to any one of claims 10 to 12, wherein the inclined wall surface portion (24) is a curved surface.   A second wall surface portion (25) is formed on the bottom surface (22) side from the inclined wall surface portion (24), and the second wall surface portion (25) is inward from the inclined wall surface portion (24). Indented tool body.   A cutting tool comprising the cutting insert (1) according to any one of claims 1 to 9.

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