KR100448687B1 - A cutting Tool with Round Insert mounting thereof - Google Patents

Abstract

The upper surface, the lower surface, the side portion connecting the lower surface and the upper surface and the upper surface and the side portion meet to form a cutting edge, which is a side portion connecting the upper surface and the lower surface in an insert having a circular cutting edge. The cutting tool is installed in the cutting tool body to insert the insert quickly, accurately, and powerfully to prevent the insert rotation and screw loosening even in the cutting load generated when machining the workpiece. The cutting insert according to the present invention is equipped with one or more inserts in the cutting tool body, the insert in the cutting tool used basically has a circular cutting edge, the upper side, the lower side, and the side, side portion connecting the upper and lower surfaces And the upper face meet to form a circular cutting edge, and from the cutting edge toward the center of the insert's upper surface, there is a chip breaker for more effective cutting during cutting, and the side portion is accurate and powerful when the insert is mounted on the cutting tool body. It is a concave-convex shape that induces to be mounted, and it is strongly fixed when it is fixed to the seat of the cutting tool body on which the insert is mounted, thereby preventing the insert from rotating even in the cutting resistance generated when cutting the workpiece with the cutting tool. It is a cutting tool that can improve cutting performance and insert life.

Description

Cutting tool with round inserts

The present invention relates to a cutting tool for cutting a workpiece into a desired shape, at least one cutting insert is mounted to the cutting tool body, and more particularly, the side shape and the insert of the cutting insert are mounted to the cutting tool body. By improving the shape of the insert mounting seat, the insert is strongly mounted and fixed when the insert is mounted on the cutting tool body.In the cutting load generated during machining of the workpiece, the insert rotates or inserts and cuts due to the movement of the insert and the rotation of the insert. The present invention relates to a cutting tool capable of improving the life of the cutting tool, replacing the insert, and stably machining the cutting resistance generated during cutting by solving the problem of loosening or even tightening of the coupling screw of the tool body. The invention also relates to inserts suitable for use in such cutting tools, more particularly to round inserts.

In general, a cutting tool is mainly used for cutting ferrous, nonferrous metals, and non-metallic materials, and is a tool that is usually mounted on a machine tool and performs cutting to process a workpiece into a desired shape. Such cutting tools typically comprise a cutting insert with a cutting edge and a cutting tool body for holding the insert.

In addition, the cutting tool can be divided into welding type and indexable type according to the method of fixing the cutting insert. The welding type is to permanently fix the cutting edge by welding the cutting edge to the body, and the indexable type is to fix the body and the cutting insert. It is a cutting tool that attaches and detaches cutting insert to body by using screw or other fixing device to fix it.

Indexable cutting tools should be replaced at the end of the life of the cutting insert. In this case, the insert should be replaced in a short time and should be easy to change. Also, even if the insert is repeatedly changed, it is always in the same position. The cutting edges must be in the same position at all times, and the bearings must be sufficiently fixed to the cutting load generated during cutting. In particular, stable fixation is required for various materials and cutting conditions.

On the other hand, there are two ways to cut a workpiece by using a cutting tool. Firstly, turning is performed by cutting a rotating workpiece using a fixed cutting tool. Second, the cutting tool rotates. It is the process of cutting the fixed workpiece. The cutting tool disclosed in the present invention corresponds to both the above-mentioned turning and milling operations, and in turning, a cutting insert is mounted on the body sheet of the cutting tool body for turning, and the inner diameter, the outer diameter, and the imitation of the workpiece are processed. In the milling process, the cutting insert is mounted on the milling tool body seat, and the surface processing, the side processing, the groove processing, the inclined processing, and the curved processing are performed. In this case, the cutting tool of the present invention processes the workpiece by mounting and fixing the cutting insert using a screw to the cutting tool body for turning, or the cutting tool body for milling. Therefore, as the workpiece is processed by the feed of the cutting tool during turning, cutting resistance is generated which is opposite to the force that the tool is intended to feed, which is called a feed component. This feed component allows the insert, which is fixed by the turning tool body screw, to be pushed or rotated in the opposite direction of the feed as it is circular, and also to a fixed role as the circular cutting insert is rotated by the feed component. Can be loosened or tightened more firmly. If the screw is loosened, the cutting insert will cause breakage, excessive wear of the cutting edge, and significant defects in the quality of the machined surface of the workpiece.When the screw is tightened more firmly, the insert can not be easily replaced when the insert is replaced. Losing problems can occur. In addition, in the milling process, unlike the turning operation, as the cutting tool rotates and the table on which the workpiece is mounted moves, the feed component and the rotating milling are performed in the opposite direction in which the table is fed. The cutting load of the cutting main force is generated against the direction of rotation of the cutting tool, whereby the screw holding the circular cutting insert is loosened, or the insert is rotated by the feed force and the main force. do. As a result, various problems arising in turning operations occur in milling. In particular, in order to improve the production of the workpiece, high speed, high feed, high depth of cut machining are increased, and in addition, in the outer diameter processing of turning and the planar processing of milling in recent years, a variety of applications such as groove processing, inclined processing, and imitation processing As the cutting process must be performed, the rigidity of the screw alone is difficult in the method of mounting the insert to the cutting tool body using the screw, and thus, many of the above problems occur. Therefore, the cutting tool can improve productivity, increase tool life, and achieve high cutting quality as cutting is performed by inserting or screwing firmly without turning even in high speed, high feed, high cutting and application of various processing methods. Many efforts have been made to develop the system.

US patents US5346336 and US5236288 disclose cutting tools developed for this purpose.

The cutting tool disclosed in US5346366 forms a flat insert on the side of the round insert in order to prevent the insert from rotating during the machining of the round insert. The insert does not rotate during the operation. In addition, the cutting tool disclosed in US5236288 formed a flat surface on the side surface of the insert for preventing rotation of the circular insert and stable mounting, and the flat surface was brought into contact with the side of the seat of the cutting tool body. The flat surface formed in this way is basically formed in a shape similar to a triangle, so such a flat surface is a phenomenon that the contact surface is reduced in the area where the insert is in contact with the seat when the insert is mounted on the cutting tool body, It is insufficient to cope with the change of the strong cutting force and the strong cutting force of high speed, high feed and high cutting.

The cutting tool disclosed in US5236288 is provided with a radial concave groove on the lower surface of the cutting insert, and a part of the anti-rotation part is applied by applying an anti-rotation component to the lower surface of the cutter body after fixing the insert to the cutting tool body with a screw. Is fixed in the groove of the lower surface of the cutting insert to prevent rotation.

In this method, in order to fix the cutting tool, it is inconvenient to change the inserts quickly as the anti-rotation parts must be operated in addition to the screw, and the anti-rotation effect is changed according to the size of the anti-rotation parts and the shape of the anti-rotation parts. In addition, the rigidity of the parts is necessary due to the cutting resistance generated during cutting.

The present invention is to solve the prior art as described above, the circular cutting insert in the cutting tool by the cutting resistance generated when processing the workpiece, the insert is moved or the insert is rotated in various processing forms, It can be applied to various types of processing by preventing problems such as loosening of fixing screws or damage of cutting tools or shortening of life, and improving productivity through high speed, high feed and high cutting processing. Of course, in order to improve the life of the cutting tool, when the circular insert is mounted to the seat of the cutting tool body by the screw, it is strongly mounted to prevent the rotation of the circular cutting insert and loosen the screw. It is possible to feed and high-input machining, and it does not rotate when machining with various processing methods, and excellent machining To provide a cutting tool securing performance and life it is an object. It is another object of the present invention to provide a round insert suitable for use in such cutting tools.

1 is an exploded perspective view of a cutting tool according to the present invention,

2 is a perspective view of a cutting insert according to the present invention,

3 is a front view of the cutting insert shown in FIG.

4 is a plan view of the cutting insert shown in FIG.

Figure 4a is a cross-sectional view of the A-A section of the cutting insert shown in FIG.

5 is a bottom view of the cutting insert shown in FIG.

Figure 6 is a perspective view of the seat portion of the cutting tool body shown in Figure 1,

7 is a combined view of the cutting tool shown in FIG.

8 is a longitudinal cross-sectional view of the uneven part after the cutting tool shown in FIG.

9 is a cross-sectional view of the B-B portion of the uneven portion after the cutting tool shown in FIG.

Frowning

10 is a perspective view applied to a turning cutting tool according to the present invention.

Explanation of symbols on the main parts of the drawing

10: cutting tool 100: cutting tool body

110: sheet portion 120: sheet opening

130: seat lower surface 140: seat side portion

150: uneven sheet portion 160: chip pocket portion

200: insert 210: upper surface

220: lower surface 230: first clearance surface

240: second clearance surface 260: uneven portion

270: insert opening 280: land surface

290: cutting edge 291: chip breaker

292: chip groove 300: screw

400: Turning cutting tool

In order to achieve the above object, the cutting tool of the present invention is a basic structure for fixing the cutter body and the circular insert using a screw, the insert has an upper surface, a lower surface, the upper surface of the circular In the shape of the edge of the upper surface has a circular cutting edge, from the circular cutting edge toward the lower surface, has a circular first clearance surface, and has a circular second clearance surface from the lower surface upwards, The insert has a concave-convex concave-convex surface convex toward the second clearance surface from the lower surface of the first clearance surface, and in order to fasten the cutting insert to the cutting tool body, the insert has an opening formed through the upper and lower centers. The insert is mounted to perform the cutting operation, the fixed cutting tool body has a seat (Seat) for mounting the insert The seat part has a seat side surface part in contact with the seat bottom surface on which the bottom surface of the insert is seated, and a seat side surface part in contact with the first clearance surface of the insert, and a seat unevenness part for contacting the uneven shape of the insert. This uneven portion has an uneven surface opposite to the uneven shape of the insert, and has a sheet opening through which the screw is inserted to fix the cutting insert to the sheet portion, and an opening and a seat opening of the insert. It provides a cutting tool comprising a screw inserted in the.

In the insert provided to the cutting tool, the first clearance surface is inclined toward the lower surface of the insert from the cutting edge at the edge of the upper surface, wherein the inclined inclination angle is 5 with respect to the vertical line of the upper surface. It consists of an angle of inclination of 30 degrees.

In addition, the first clearance surface is provided at a height of 1 / 3t to 2 / 3t from the lower surface to the thickness (t) of the insert, and the second clearance surface from the lower surface toward the upper surface is It has an inclination angle of 5 to 30 degrees with respect to the vertical line, and the second clearance has a thickness of 1 / 3t to 2 / 3t from the lower surface with respect to the thickness of the insert.

Concave-convex portion connecting the first clearance surface and the second clearance surface basically has an inclination angle of 7 degrees to 90 degrees greater than the inclination angle of the first clearance surface and the second clearance surface, wherein the projections and depressions at the bottom of the insert When viewed, it has a radial 4 to 24 repeated irregularities, and by this irregularity, when the insert is mounted on the cutting tool body, the seat portion of the cutting tool body is combined with the uneven portion of the sheet portion opposite to the uneven portion of the insert. Strong mounting and avoid rotation during cutting. The height of the first clearance surface is not the same in the entire portion of the insert and the thickness varies in the range of 0.1 ~ 2mm by the unevenness.

When the cutting insert and the cutting tool body seat part are unevenly provided, the fastening and the use corner of the insert are changed to a new corner. It is possible to change the cutting insert's corner even if it is rotated only 1 ~ 3 rotation without removing it. Also, when changing the insert's corner, the cutting insert and screw may be lost due to separation of insert and screw. Disappears.

As mentioned above, the cutting tool according to the present invention is designed to produce a cutting insert, a cutting tool body, and a concave-convex shape to the seat portion (seat) shape of the seat portion in the body, thereby inserting quickly, accurately, and powerfully. Equipped with a variety of processing methods, as well as machining conditions of high speed, high feed, and high cutting, the insert can be rotated and moved by cutting resistance, and stable machining can be performed.

Hereinafter, a cutting tool according to the present invention and an insert suitable for use thereof will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view of a cutting tool according to the present invention.

Referring to FIG. 1, the cutting tool 10 according to the present invention mainly includes a screw 300 for fixing the cutting insert 200, the cutting tool body 100, and the cutting insert 200 to the cutting tool body 100. Include.

First, the cutting insert 200 is mainly manufactured by cementing the cemented carbide material through a powder metallurgy process, that is, a die pressure, sintering, and grinding process. The cutting insert 200 basically has a circular shape, and has an upper surface 210, a lower surface 220, a plurality of side clearance surfaces 230 and 240 and an uneven portion 260, and a screw 300. It has an insert opening 270 into which it can be inserted.

The cutting tool body 100 has a seat portion 110 so that the insert 200 can be mounted, and the seat portion 110 can mount the insert 200 by using a screw 300. The seat side surface 140 which angles the seat opening 120 and contacts the seat bottom surface 130 on which the bottom surface 220 of the insert 200 is mounted and the side first clearance surface 230 of the insert 200 are in contact with each other. And the sheet concave-convex portion 150 opposite to the concave-convex portion 260 of the insert 200.

2 is a perspective view of a cutting insert 200 according to the present invention.

3 is a front view of the cutting insert 200 shown in FIG.

2 and 3, the cutting insert 200 according to the present invention has a circular shape is provided with an upper surface 210 and a lower surface 220, and a plurality of side clearance surfaces (230, 240).

Land surface 280 is provided adjacent to the upper surface 210, the edge of the land surface 280 has a cutting edge 290, the side clearance surface from the circular cutting edge 290 The first clearance surface 230 is inclined inward toward the lower surface 220 to form a first clearance surface 230, wherein the first clearance surface 230 is basically provided in a circular shape, and the inclination of the first clearance surface 230 is the upper portion. It is formed to be inclined with respect to the perpendicular line with respect to the surface 210 and has an inclination angle α in the range of 5 degrees to 30 degrees, and the thickness of the first clearance surface 230 is about the total thickness of the insert 200 (t). The lower surface 220 is provided at a height of 1/3 to 2/3 t.

The uneven portion 260 is formed from the lower portion of the first clearance surface 230 toward the lower surface 220 and the second clearance surface 240, and the uneven portion 260 is the first clearance surface 230. It begins at the bottom of the. The height of the first clearance surface 230 is not the same in all parts of the insert 200 by the uneven portion 260 and the first clearance surface in the range of 0.05 ~ 1.5mm by the uneven portion 260 The height of 230 changes.

The second clearance surface 240 which faces the upper surface 210 from the lower surface 220 of the insert 200 is inclined with respect to the vertical line of the upper surface 210 and has an inclination angle β of 5 degrees to 30 degrees. The second clearance surface 240 has a height of 1/3 to 2 / 3t from the lower surface 220 with respect to the thickness t of the insert 200, and the first clearance surface 230. The uneven portion 260 starting from the bottom of the bottom portion is basically formed toward the second clearance surface 240, and at least the uneven portion 260 is formed to be higher than the bottom surface 220.

The uneven portion 260 is formed at an inclination angle γ of 7 degrees to 90 degrees with respect to a vertical line of the upper surface 210, and the inclination angle α of the first clearance surface 230 and the second clearance. It is basically formed to be larger than the inclination angle β of the surface 240. In addition, the shape of the uneven portion 260 is provided as a curve having a radius (R) of 0.5 ~ 5.0mm when viewed from the insert 200 side, preferably the range of the radius (R) is 1.5 ~ 5.0mm Has the size of.

The unevenness of the uneven portion 260 is repeatedly provided at the same angle of 4 to 24 radial, when viewed from the bottom of the insert 200, of the cutting insert 200 mounted to the cutting tool 10 In order to change the use corner of the cutting edge 290 by rotating the insert 200 to a new unused portion, loosen the fixing screw 300 one to three rotations, and in the cutting tool 10, Even without completely separating the cutting insert 200, the cutting tool body 100, and the screw 300, the corner can be changed by rotating the corner of the cutting insert 200. Therefore, it is possible to quickly change the corner of the cutting insert 200, and also, when the corner of the insert 200, the screw 300 is completely separated from the cutter body 100 and the insert 200, insert 200 or screw Drop 300 to the inside of processing equipment or to the floor of the workshop to prevent loss or damage.

4 is a plan view of a cutting insert 200 according to the present invention.

Referring to FIG. 4, the upper surface 210 has a circular shape, and forms a cutting edge 290 at the edge of the upper surface 210, from the cutting edge 290 toward the center of the upper surface 210. The land surface 280 is formed and adjacent to the land surface 280, a chip breaker 291 is provided toward the center of the upper surface 210. The chip breaker 291 is to smoothly discharge the chip generated when the workpiece is processed, the chip groove 292 is provided to minimize the conduction of the high temperature heat of the chip to the cutting insert (200). Since the chip breaker 291 is manufactured by a mold pressure and a sintering method using a dedicated mold, post-processing is unnecessary in the manufacturing process of the insert 200. Referring to FIG. 2, the chip breaker 291 is provided to be inclined toward the flat upper surface 210 from the land surface 280, and the upper surface 210 is basically provided as a flat surface. The center of the upper surface 210 includes an insert opening 270 to fix the cutting insert 200 to the seat portion 110 of the cutting tool body 100 by using a screw 300.

4A is a vertical cross-sectional view of an A-A portion of the cutting insert 200.

Referring to FIG. 4A, a first clearance surface 230, a second clearance surface 240, and an uneven portion 260 of the cutting insert 200 have an inclination angle, and an upper surface 210 of the cutting insert 200. The first clearance surface 230 has an inclination angle α of 5 to 30 degrees with respect to a straight line perpendicular to), and the second clearance surface 240 has an inclination angle of 5 to 30 degrees and a first clearance The inclination angle γ of the uneven portion 260 connected to the surface 230 and the second clearance surface 240 is the inclination angle α of the first clearance surface 230 and the inclination angle of the second clearance surface 240. It is based on being formed larger than β), the inclination angle γ of the uneven portion 260 is provided with an inclination angle γ in the range of 7 ~ 90 degrees.

The first clearance surface 230 is provided toward the cutting edge 290 at a height of 1/3 to 3/2 with respect to the thickness of the cutting insert 200 (t), and the second clearance surface 240 is It has a height of 1/3 to 2/3 of the thickness from the lower surface 220 of the cutting insert 200.

5 is a bottom view of the cutting insert 200 shown in FIG.

Referring to FIG. 5, the concave-convex portion 260 has a radial shape with respect to the center of the circular insert 200, and is provided in the form of 4 to 24 repetitive shapes. In the cutting tool 10, the cutting insert 200 is Available from 3 to 12 corners.

6 is a perspective view of the seat 110 of the cutting tool body 100 shown in FIG.

Referring to FIG. 6, the cutting tool body 100 includes a chip portion 160 and a seat portion 110 on which the insert 200 is mounted by a screw so as to smoothly discharge chips discharged during cutting. to provide.

The seat unit 110 has a structure in which the circular insert 200 can be mounted basically, and basically, the seat lower surface 130 and the seat opening 120 of the lower surface, and the seat unit 110. The side surface 140 is provided with a concave sheet convex portion 150 into which convex convex portions of the concave and convex portions 260 of the insert 200 are inserted.

The lower surface 220 has a flat circular shape in contact with the lower surface 220 of the cutting insert 200 when the circular cutting insert 200 is mounted, and the sheet opening 120 has the cutting The screw 300 is inserted when the insert 200 and the cutting tool body 100 are coupled by the screw 300. The sheet uneven portion 150 forms concave and convex so that the convex convex and convex portions of the concave and convex portion 260 of the insert 200 can be inserted into a stable and powerful installation, and the sheet concave and convex portion 150 is the insert 200. The convex concavities and convexities of the sheet 110 is formed in a curved shape so as to be inserted into the concave convex concave portion 260, the radius of curvature r has a size of 0.1 ~ 5.0mm.

One or more unevenness of the seat part 110 is basically provided to the seat part 110 to be in contact with the uneven part 260 of the circular cutting insert 200.

When the cutting insert 200 is mounted to the seat portion 110 of the cutting tool body 100, the seat side surface 140 contacting the first clearance surface 230 of the cutting insert 200 is the cutting insert 200. It has the same inclination angle as the inclination angle α of the first clearance surface 230 of.

7 shows a state in which the cutting insert of the cutting tool shown in FIG. 1 and the milling cutting tool body are completely coupled by screws, and FIG. 8 is a longitudinal direction of the uneven part after the cutting tool shown in FIG. It is a cross section. 9 is a cross-sectional view of the B-B part of the uneven part after the cutting tool shown in FIG. 8.

8 and 9, it can be seen that the more detailed coupling state of the uneven portion 260 in the cutting tool 10.

In the cutting tool 10, the side concave-convex portion 260 of the cutting insert 200, the concave-convex portion 260 of the sheet portion 110 of the cutting tool body 100, and the first clearance surface of the insert 200. 230 and the side clearance surface 140 of the cutting tool body 100 is in contact.

The contact between the insert 200 and the sheet concave and convex portion 150 is inserted into the concave and convex concave and convex portions of the insert 200 by the concave and convex portion formed in a circular shape, and the concave and convex portion of the insert 200 The curve R and the curve r of the uneven portion of the seat 110 do not have the same radius of curvature, and the cross curves are provided differently.

The irregularities of the insert 200 and the seat portion 110 are basically based on the uneven curve of the insert 200 being smaller than the uneven curve of the sheet. Therefore, the contact between the unevenness of the insert 200 and the seat part 110 is inclined in one direction from the center of the uneven curve to contact. At this time, since the sizes of the provided uneven curves are different from each other, all parts of the unevenness are not in contact, and the uneven contact is in contact with each other by a line (Line) contact.

In the cutting tool 10 of the present invention, the contact of the concave-convex portion 260 is basically provided to be in contact with the sheet groove. Therefore, even when the cutting tool 10 receives excessive cutting resistance, the insert 200 is rotated or the screw 300 is loosened or more tightly tightened by the rotation of the insert 200.

10 is a perspective view in which the insert 200 of the present invention is applied to a turning cutting tool according to the present invention.

Referring to Figure 10, according to the present invention, it can be seen that can be applied to a variety of cutting tools 10 can be manufactured.

As described above, the cutting tool according to the present invention provides a concave-convex in the sheet portion of the cutting tool body in which the cutting insert and the insert is mounted in the cutting tool in which the circular cutting insert is mounted to the cutting tool body using a screw. By designing and manufacturing, the turning, movement, and screw loosening or tightening of the inserts attached to the cutting tool do not occur even in the various machining methods of turning and milling and the cutting resistance of high speed, high feed, and high cutting. Even when repeated inserts are changed during cutting, the precision of the workpiece is always good by the same positioning. If the cutting edge of the insert is worn, missing or damaged due to the machining of the workpiece, the cutting edge is changed to a good cutting edge. Even if you want to install the screw, loosen the screw completely from the cutting tool body and the insert. A screw without loosening to rotate only 1 ~ 3 turns it is possible to exchange the insert corner.

Therefore, the cutting tool according to the present invention can be applied to various cutting methods, and particularly strong and stable even when the direction of various cutting loads such as plane processing, inclined processing, groove processing, ramping, etc. of milling is changed. By fastening, it is possible to cut a good workpiece without problems such as rotation or movement of the insert, loosening of the screw, and tightening.

While the above has been described with reference to the preferred embodiment of the present invention, those skilled in the art various modifications and changes of the present invention without departing from the spirit and scope of the present invention described in the claims below I can understand that you can.

Claims (8)

At least one cutting insert is mounted to a cutting tool body for holding the cutting insert is a cutting tool for cutting ferrous, non-ferrous metals, non-metal materials into a desired shape, the cutting tool is a cutting insert with a cutting edge, the cutting insert In the cutting tool consisting of a cutting tool body to be mounted, a screw which is a coupling device for coupling the cutting insert and the cutting tool, The cutting insert of the cutting tool is formed with a plurality of side surfaces connecting the upper surface, the lower surface, the lower surface and the upper surface, the edge of the upper surface has a cutting edge, the cutting edge is formed of a circular cutting edge A chip breaker is formed in the upper surface, and an opening through which a screw, which is the coupling device, is inserted, is formed in a central portion of the upper surface, and the plurality of side surfaces are circular first side clearance surfaces from the cutting edge toward the lower surface. And a concave-convex portion in which concave-convex is formed in the lower portion of the first side clearance surface, and a circular second side clearance surface formed toward the upper surface from the lower surface; The cutting tool body is formed with a seat portion so that one or more cutting inserts can be mounted and fastened, and the seat portion is a lower surface of the seat on which the lower surface of the insert is mounted when the insert is mounted, the first of the cutting insert One or more sheet side portions in contact with the side portions, and one or more sheet irregularities formed to insert the uneven portions of the cutting insert are formed, and the seat lower surface is provided with a sheet opening into which the screw is inserted to fix the cutting insert. Become; The first side clearance surface, the uneven portion and the second side clearance surface of the cutting insert are formed to be inclined with respect to the line perpendicular to the upper surface of the cutting insert, the first side is inclined inclination angle of 5 ~ 30 It has a range of degrees, the inclined inclination angle of the second side clearance surface has a 5 ~ 30 degrees, the convex convex portion of the insert concave portion is formed in a curve, has a radius of curvature of 0.5 ~ 5mm range, the inclined of the concave The inclination angle has a larger inclination range than the inclined range of the first and second side clearances, the inclination angle of the uneven portion has a range of 5 to 90 degrees, and the unevenness is radially 4 to 24 at the center of the cutting insert. The uneven portion is formed, the uneven portion is inserted into the cutting tool body at least one is inserted into the uneven portion of the seat portion, the first side surface is 1/3 to 2/3 of the thickness of the cutting insert It has a thickness of, the cutting tool, characterized in that the thickness of the first side clearance surface is formed by varying in the range of 0.1 ~ 2mm by the irregularities. The cutting insert of claim 1, wherein the cutting insert includes a circular cutting edge, an upper surface, a lower surface, and a plurality of side portions and an opening at a center of the upper surface, wherein the plurality of side portions are inclined from the cutting edge toward the lower surface. A circular second side clearance surface formed toward the top surface inclined from the first side clearance surface and the bottom surface of the radially relative to the center of the cutting insert between the first side clearance surface and the second side clearance surface; -Cutting tool characterized in that the 24 uneven parts are formed. According to claim 1, wherein the cutting tool body is formed with a sheet portion to which the cutting insert is mounted, the sheet portion has a sheet opening in the center of the seat side, the seat lower surface, the seat lower surface, the seat lower surface and the seat side Cutting tool characterized in that it has a sheet concave-convex portion to be seated by inserting the concave-convex portion of the cutting insert. The side surface portion of the cutting insert according to claim 1, wherein the side surface portion of the cutting insert is formed to be inclined toward the lower surface in a circular shape from the cutting edge, and the second side clearance surface is circular from the lower surface toward the upper surface; An uneven portion is formed between the first side clearance surface and the second side clearance surface, and the first and second clearance surfaces are formed to be inclined at a range of 5 to 30 degrees with respect to a vertical line of the upper surface. The concave and convex portions may have an inclination angle in a range of 5 to 90 degrees greater than the inclinations of the first and second clearance surfaces, and the convex and convex portions may have a radius of 0.1 to 5.0 mm from the lower side of the first side clearance surface. And a height of 1/3 to 2/3 with respect to the height of the circular cutting insert of the first clearance surface, and the first side clearance surface has a height of 0.1 to not constant due to the curved irregularities. In the range of 2mm Change the cutting tool, characterized in that. The method of claim 1, wherein when the cutting insert and the cutting tool body is coupled by a screw, the first clearance surface of the cutting insert is in contact with the side clearance surface of the seat portion, the unevenness of the cutting insert, the sheet portion uneven portion Cutting tool, characterized in that the cutting insert is fixed to the insert does not rotate. The method of claim 1, wherein when the cutting insert and the cutting tool body is coupled by a screw, the uneven part curved radius of the cutting insert is smaller than the uneven curvature radius of the sheet part, so that the uneven surface of the insert is uneven. Is inserted into the cutting tool, characterized in that the unevenness of the insert and the unevenness of the sheet portion is in contact with the whole of the uneven portion biased in one direction from the center of the unevenness. The cutting tool according to claim 1, wherein the unevenness of the insert and the unevenness of the seat portion are biased in one direction so that the contact surface is in a straight line shape when contacted. According to claim 1, wherein at least one of the sheet concave-convex portion is provided in the sheet portion of the cutting tool body, when the cutting insert is combined, the insert is cut as the concave-convex portion of the insert is inserted into the concave-convex portion of the sheet portion The cutting tool, characterized in that the insert does not rotate even when performing the machining.