KR100576320B1 - Cutting insert - Google Patents

Abstract

The shape of the chip breaker and the cutting edge are applied in the form of stairs to smooth the flow of cutting chips formed during cutting, and reduce the welding phenomenon and cutting resistance of the cutting edge to improve the surface roughness and tool life. And cutting inserts having improved cutting chip processing capability in various types of turning. The cutting insert according to the present invention forms an edge cut and a main cut on the upper surface and the main cut has a stepped shape consisting of one or more steps lowered from the edge cut to the center side of the main cut, respectively The chip breaker is formed in the shape of a staircase consisting of one or more steps along the edge pickling to the main pickling and is inclined toward the upper surface side.

Description

Cutting inserts

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

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

3 is a front view of the cutting insert shown in FIG. 1,

4 is an enlarged view of a portion A shown in FIG. 2;

5a to 5c are views showing other embodiments of the first extension formed in the main cut,

6 is a cross-sectional view taken along the line B-B of FIG. 2,

FIG. 7 is an enlarged view of a portion D shown in FIG. 6.

8 is a cross-sectional view taken along the line C-C shown in FIG. 2, and

9A to 9C illustrate other embodiments of the second extension formed on the chip breaker.

Explanation of symbols on the main parts of the drawing

100: cutting insert 110: upper surface

112: circular opening 114: lower surface

120: edge pickled 122: corner margin

130: main temple 132: side margin

134: first parallel portion 136: first extension portion

138: first connection portion 140: chip breaker

142: second parallel portion 144: second extension portion

146: second connection portion 150: boss portion

The present invention relates to a cutting insert, and more particularly, by applying a shape and a cutting edge of a chip breaker in a step form to smooth the flow of the cutting chip formed during cutting, and welding phenomenon of the cutting edge. The present invention relates to a cutting insert having reduced cutting resistance, improved surface roughness, improved tool life, and improved cutting chip processing capability in various types of turning.

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. Cutting tools using a cutting tool include a turning process for performing a fixed cutting tool cutting of a rotating workpiece and a milling process for cutting a workpiece that is fixed while the cutting tool is rotated.

In turning, the cutting insert is mounted on the body sheet of the cutting tool body for turning, and the inner and outer parts of the workpiece, the outer diameter, and the imitation process are performed.In the milling process, the cutting insert is inserted into the sheet of the cutter body, which is a milling cutting tool Equipped with surface processing, side processing, grooving, beveling, surface processing and so on.

In the above-mentioned turning process, it is important to efficiently discharge the cutting chip generated during cutting as the cutting insert continuously contacts the rotating workpiece, and the outer diameter machining, the inside diameter machining, the imitation machining, the end face machining, etc. In order to reduce the cutting resistance, the cutting edge life, the surface roughness of the workpiece, and the reduction of the cutting resistance are crucial to ensuring effective cutting chip throughput.

In addition, in the cutting insert for turning, the cutting chips formed during the cutting process are smoothed, and the cutting inserts are provided in various shapes on the upper and cutting edges of the cutting inserts in order to reduce welding chips or workpieces on the cutting edges and the upper surfaces. Many efforts have been made. European patent EP0125568 and Korean patent KR336206 or US6217264 disclose cutting tools developed for this purpose.

The cutting insert disclosed in EP0125568 consists of a chipbreaker side part and a top surface on which a cutting edge is formed, and a flat inclined surface. The cutting insert is discharged when the cutting chips generated when cutting the workpiece in contact with the cutting edge and the side and the top surface of the chip breaker. However, high temperature cutting heat is transferred from the cutting chip to the chip brake part of the cutting insert, minimizing the occurrence of welding of the cutting chip and discharging the cutting chip in various turning operations such as inner diameter, outer diameter, end face machining, and imitation machining. There was an inadequate issue.

In addition, the cutting insert disclosed in KR336206 or US6217264 forms an uneven upper surface and an inclined chipbreaker portion with a smooth curved surface. This cutting insert allows the flow of cutting chips generated during cutting processing to be formed smoothly, but it is insufficient to minimize the welding phenomenon on the cutting edge, and insufficient to discharge the cutting chips smoothly in various turning operations. There was this.

The present invention has been made to solve the conventional problems as described above, the object of the present invention is to apply the shape of the chip breaker and the cutting edge in the form of steps cutting of iron-based or non-ferrous metals such as aluminum, copper, stainless steel, etc. The flow of cutting chips formed at the time is smooth, the contact between cutting chips and cutting inserts is minimized, the conduction of cutting heat is minimized, and the welding phenomenon of workpieces or cutting chips on the chip breaker part and cutting edge of cutting inserts is reduced. In order to improve the surface roughness and tool life, it is possible to provide cutting inserts that can exhibit efficient chip treatment in various types of turning operations such as internal diameter, external diameter, end face machining, and imitation machining.

In order to achieve the object of the present invention as described above, the present invention,

It has the shape of either parallelogram or tetrahedron, and the circular opening is vertically penetrated at the center, and four corners of the upper surface are provided with edge pickles, and between the edge pickles, major cuticles are provided. In the cutting insert which is provided between the lower surface and the edge edge is provided with a smooth edge margin, respectively, and between the lower surface and the major edge is a side margin surface, respectively.

Jukjeol-in has a staircase shape consisting of one or more steps that are lowered from the edges to the center of the Jukjeol-in. It provides a cutting insert having a chipbreaker is formed to be inclined toward the upper surface.

As described above, according to the present invention, the shape of the chip breaker and the cutting edge is applied in a step shape to smoothly flow the cutting chips formed during cutting of iron-based or non-ferrous metals such as aluminum, copper, and stainless steel. It minimizes the contact between cutting chips and cutting inserts to minimize the conduction of cutting heat, and reduces the welding phenomenon of workpieces or cutting chips on the chipbreaker part and cutting edge of cutting inserts to improve the surface roughness and tool life. In addition, it is possible to exhibit efficient chip treatment in various types of turning operations such as inner diameter, outer diameter, end face machining, and imitation machining.

Hereinafter, a cutting insert according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view of a cutting insert according to the invention.

Referring to FIG. 1, the cutting insert 100 according to the present invention uses only the upper surface 110 when cutting ferrous or nonferrous metals.

In the center portion of the cutting insert 100 is formed a circular opening 112 penetrates vertically. It is composed of either a parallelogram or a tetrahedron around the cutting insert circular opening 112. Four cutting edges of the cutting insert 100 are provided with edge cutting 120, and between the cutting edge 120 is the main cutting 130 is provided to extend each. In addition, a soft edge free surface 122 is provided between the lower surface 114 and the edge pickle 120, and a side free surface 132 is provided between the bottom surface 114 and the major pickle 130, respectively. .

At this time, the main pickling 130 has a stepped shape consisting of one or more steps that are lowered from the corner pickling 120 to the center side of the main pickling 130, each of the corner pickling 120 and the main pickling 130 The chip breaker 140 is formed to be inclined toward the upper surface 110 while being formed in a step shape similar to one or more steps along the pickling 120 and the main pickling 130.

FIG. 2 is a plan view of the cutting insert shown in FIG. 1, FIG. 3 is a front view of the cutting insert shown in FIG. 1, and FIG. 4 is an enlarged view of a portion A shown in FIG. 2.

1 to 4, each edge cut 120 is made to be parallel to the lower surface 114. The height h1 of each of the edge cuttings 120 is provided in the range of 0.1 to 1.0 mm higher than the upper surface 110, and is provided in curvature having a radius R1 of 0.1 to 3.5 mm. At this time, any one of the diagonally opposite edge picking 120 is provided at an angle of more than 35 ° 90 °, another diagonally opposite edge picking 120 is at an angle of more than 90 ° 175 ° or less Is provided.

The height h2 of each major cutout 130 is provided higher than the upper surface 110 in the range of 0.05-1.0 mm. That is, the main pickling 130 is provided at any one of the same height as the edge picking 120 or lower than the edge picking 120. Each of the major cutouts 130 has a first parallel portion 134 having a predetermined length in the center portion, and at least one end of the first parallel portion 134 extending in an inclined surface to the edge cutout 120. 1 extension part 136 is provided. In this case, the first extension part 136 has an inclination angle θ1 of 3 to 15 °, and each first extension part 136 has a height h3 of 0.01 to 1.5 mm. In addition, each of the first extensions 136 having different heights is connected to the first connecting portion 138 which is continuously connected in opposite directions so as to be connected smoothly. Preferably, the first connection portion 138 has a radius R2 of 0.05 to 1.0 mm. More preferably, one first extension portion 136 extends by a distance l of 0.5 to 2.5 mm.

Preferably, the main cutout 130 may be made of only the first parallel portion 134 which is the same as the height of the edge cutout 120.

5a to 5c are views showing other embodiments of the extension shown in FIG.

5A through 5C, the first extension part 136 may be provided with a curvature that is curved toward the upper side of the main cutout 130. At this time, the curvature has a radius R3 of 5-100 mm. In addition, the first extension part 136 may be provided with a curvature that is curved toward the lower side of the main cutout 130. Similarly the curvature has a radius R4 of 5-100 mm. Preferably, the first extension portion 136 has an inclined surface extending from the first parallel portion 134 to the edge cutting 120 side, the curvature R3 curved toward the upper side of the main cutting edge 130 and the curvature curved downward. May be provided in combination with R4).

FIG. 6 is a cross-sectional view taken along the line B-B of FIG. 2, FIG. 7 is an enlarged view of a portion D shown in FIG. 6, and FIG. 8 is a cross-sectional view taken along the C-C shown in FIG. 2.

Referring again to FIGS. 1 and 2, the chip breaker 140 is provided in a shape to reduce the friction area with the cutting chip to minimize cutting heat from being conducted to the cutting insert 100.

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 2, and FIG. 7 is a cross-sectional view taken along line C-C shown in FIG. 2.

6 and 7, the chip breaker 140 extends inclined toward the upper surface 110 from each corner cut 120 and each major cut 130.

Each of the chip breakers 140 is provided in the same manner as the respective main cutouts 130. For this purpose, a second parallel part 142 corresponding to the first parallel part 134 is provided at the center of the chip breaker 140. At least one second extension part 144 corresponding to the first extension part 136 is formed at both ends of the second parallel part 142. That is, the second extension part 144 extends toward the edge cut 120 at both ends of the second parallel part 134.

In this case, like the first extension part 136, the second extension part 144 extends from the opposite ends of the second parallel part 142 to the edge pickling 120 and has different heights. Preferably, any one second extension 144 adjacent to each corner cut 120 is integrally formed with another neighboring second extension 144 facing diagonally. At this time, the second extension portion 144 adjacent to each of the edge cutting 120 has a curvature consisting of a radius (R5) of 0.05 ~ 1.0mm to be curved to the lower side of the chip breaker 140.

The second extension part 144 has the same inclination angle θ1 'as the first extension part 136, and each second extension part 144 has a height h3' of 0.01 to 1.5 mm. Has In addition, each second extension 144 having a different height is connected to the second connection 146 continuously connected in opposite directions so as to be smoothly connected like the first extension 136. Preferably, the second connection portion 146 has a radius R2 'of 0.05 to 1.0 mm. More preferably, one second extension 144 has a distance l ′ of 0.5 to 2.5 mm equal to the first extension 136.

9A to 9C illustrate other embodiments of the second extension formed on the chip breaker.

9A to 9C, the second extension part 144 may be provided with a curvature R3 ′ that is curved toward the upper side of the chipbreaker 140. At this time, the curvature R3 'has a radius of 5-100 mm. In addition, the second extension part 144 may be provided with a curvature R4 ′ that is curved toward the lower side of the chipbreaker 140. Similarly, the curvature R4 'has a radius of 5-100 mm. Preferably, the second extension part 144 has an inclined surface extending from the second parallel part 142 to the edge cut 120 side, a curvature R3 'curved to the upper side of the chipbreaker 140 and a curvature curved to the lower side. You can mix and brake (R4 ').

Preferably, the chipbreaker 140 has a second parallel portion 142 corresponding to the first parallel portion 134 when the major cutout 130 is made of only the first parallel portion 134 which is equal to the height of the corner cutout 120. Can only be

Meanwhile, an annular boss portion 150 protruding upward of the upper surface 110 is formed around the circular opening 112 formed on the upper surface 110 so as not to interfere with the chip breaker 140. 150 is formed on the upper surface 110 with a height h4 in the range of 0.05-0.5 mm. The boss unit 150 allows the cutting chip to be discharged in a smooth flow without great friction with the upper surface 110 when cutting the workpiece.

The cutting insert 100 according to the present invention having such a structure is fastened to the cutter body by inserting a screw by vertically penetrating the circular opening 112. The cutting insert 100 can be applied to not only turning, but also milling, grooving, imitation, side right angle machining, and the like.

As described above, the cutting insert 100 according to the present invention provides the main cutting edge 130 disposed between each edge cutting 120 to have a step shape, the edge cutting 120 from the main cutting edge 130 By having a chip breaker 140 formed in a step shape on the upper surface 110 along the), the friction between the cutting chip and the cutting insert 100 generated during cutting when the ferrous metal or non-ferrous metal is cut It can be minimized, and the cutting chip can be smoothly discharged, as well as it is possible to minimize the high temperature cutting heat in the cutting chip is conducted to the cutting insert (100).

In addition, by providing the stepped main cut 130 and the stepped chip breaker 140, the cutting resistance is reduced to increase the life of the tool, high-speed processing is possible, the main cut 130 and the chip breaker ( 140) has the advantage that the welding of the cutting chip is minimized to obtain the machining surface roughness of the excellent workpiece.

In addition, by forming the main cutting step 130 of the step shape, the cutting chip and the cutting insert (100) even during cutting by a variety of processing methods, such as inner diameter processing, cross-section processing, outer diameter processing, imitation processing, such as various processing methods of turning In addition to reducing friction with the cutting chip discharge smoothly has the advantage of extending the life of the cutting insert 100, the machining roughness of the machining surface and the like.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the invention described in the claims. You will understand.

Claims (23)

It has a shape of either parallelogram or tetrahedron and a circular opening is vertically penetrated in the center portion, and four corners of the upper surface are provided with edge pickles, and between the edge pickles, major pickles are provided. In the cutting insert which is provided between the lower surface and the edge cutting edge, respectively, and a smooth edge free surface, and between the lower surface and the main cutting edge, respectively, the side insert surface is provided. The main pickles have a stepped shape consisting of one or more steps lowered from the edge pickers to the center side of the main pickles, and each of the edge pickles and the main pickles has one or more steps along the main pickles. Cutting insert characterized in that it comprises a chip breaker is formed in a step shape made inclined toward the upper surface side. The cutting insert according to claim 1, wherein each of the edge cuttings is provided in parallel with the lower surface and is provided with a height of 0.1 to 1.0 mm higher than the upper surface. The cutting insert according to claim 1, wherein each of said edge cuttings is provided with a curvature having a radius of 0.1 to 3.5 mm. The method of claim 1, wherein the diagonally opposite edges are provided at an angle of 35 ° or more and 90 ° or less, and the diagonally opposite edges are angled at an angle of 90 ° or more and 175 ° or less. Cutting insert, characterized in that provided. The cutting insert according to claim 1, wherein each of said major cuttings is provided higher with a height of 0.05-1.0 mm than said upper surface. 2. The method of claim 1, wherein each of the major cutouts includes a first parallel portion formed at a central portion and at least one first extension portion extending with a step from both ends of the first parallel portion to the edge cutout. Cutting inserts. 7. The cutting insert according to claim 6, wherein any one of the first extension portions is formed of an inclined surface having an inclination angle of 3 to 15 degrees. 7. The cutting insert according to claim 6, wherein any one of the first extension portions has a height of 0.01 to 1.5 mm. 7. The cutting insert according to claim 6, wherein any one of the first extensions extends by a distance of 0.5 to 2.5 mm. 7. The method of claim 6, wherein each of the first extensions having different heights are connected by a first connection portion continuously connected in opposite directions so as to be smoothly connected, the first connection portion has a radius of 0.05 ~ 1.0mm Cutting insert, characterized in that. 7. The cutting insert according to claim 6, wherein the first extension portion can be provided with a curvature having a radius of 5 to 100 mm toward the upper side of the main cutting. 7. The cutting insert according to claim 6, wherein the first extension portion can be provided with a curvature having a radius of 5 to 100 mm toward the lower side of the main cutting. The method of claim 6, wherein the first extension portion has an inclined surface extending to the edge cutting, a curvature having a radius of 5 to 100mm to the upper side of the main cut-in, and a radius of 5 to 100mm toward the lower side of the main cut-in The cutting insert can be made of a combination of the curvature. The method of claim 6, wherein a second parallel portion corresponding to the first parallel portion is formed at the center of the chipbreaker, and at least one second extension portion extending to the edged side is formed at both ends of the second parallel portion. Cutting inserts. 15. The apparatus of claim 14, wherein any one of the second extensions adjacent to each of the edge cutouts is formed integrally with another adjacent second extension extending in a diagonal direction, and the first adjacent to each of the edge cutouts 2, the cutting insert, characterized in that the lower side of the chip breaker is provided with a curvature curved in a radius of 0.05 ~ 1.0mm. 15. The cutting insert according to claim 14, wherein any one of the second extension portions comprises an inclined surface having an inclination angle of 3 to 15 degrees. 15. The cutting insert according to claim 14, wherein any one of the second extensions has a height of 0.01 to 1.5 mm. The cutting insert according to claim 14, wherein any one of the second extensions extends by a distance of 0.5 to 2.5 mm. 15. The apparatus of claim 14, wherein each of the second extensions having different heights is connected by a second connection part connected in succession in opposite directions so as to be smoothly connected, and the second connection part has a radius of 0.05 to 1.0 mm. Cutting insert, characterized in that. 15. The cutting insert according to claim 14, wherein the second extension portion may be provided with a curvature having a radius of 5 to 100 mm toward the upper side of the chipbreaker. 15. The cutting insert according to claim 14, wherein the second extension portion may be provided with a curvature having a radius of 5 to 100 mm toward the lower side of the chipbreaker. 15. The method of claim 14, wherein the second extension portion is inclined surface extending to the side of the edge, the curvature having a radius of 5 ~ 100mm to the upper side of the chip breaker, and a radius of 5 ~ 100mm to the lower side of the chipbreaker The cutting insert can be made of a combination of the curvature. According to claim 1, The circular opening is formed in the periphery of the annular boss protruding to the upper side of the upper surface so as not to interfere with the chip breaker, The boss portion 0.05 ~ 0.5 on the upper side of the upper surface A cutting insert, characterized in that it is formed having a height within the range of mm.

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