KR100657382B1 - Cutting insert having best guide ability of chip curl - Google Patents

Abstract

A cutting insert for inducing an optimum chip curl is provided to extend a lifespan of a tool according to a decrement of a resistance by being able to cut a chip in a longitudinal direction. In a cutting insert for inducing an optimum chip curl, a corner cut edges are provided to four edges of an upper surface and a lower surface(104). A primary cut edge(106) and a secondary cut edge(108) are connected to each corner cut edge. A chip breaker(140) is formed on the upper surface and the lower surface. A curved type of the primary cut edge(120) is provided with curvedly being lower than a height of the corner cut edge. A depression type of the secondary cut edge is provided with being lower than a height of the corner cut edge. And, a first floor part has a convex curvature into a center part of the primary cut edge.

Description

Cutting insert having best guide ability of chip curl}

1 is a perspective view showing a cutting insert for inducing an optimal chip curl according to the present invention,

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

3 is a view of the cutting insert in "A" of FIG.

4 is a view of the cutting insert in "B" of FIG. 2, and

FIG. 5 is a cross-sectional view taken along the line C-C of FIG. 2.

6 is a view illustrating a state in which the cutting insert illustrated in FIG. 1 is mounted in a holder.

Explanation of symbols on the main parts of the drawing

100: cutting insert to induce optimum chip curl

102: upper surface 104: lower surface

106: major side 108: minor side

110: corner side 112: circular opening

114: corner cut 116: main cut

118: subtemper 120: curved head

122: inclined portion 124: first floor portion

126: second floor portion 128: connection portion

130: recessed recessed 140: chipbreaker

142: front chip breaker section 146: first rear chip breaker section

148: second rear chip breaker

The present invention relates to a cutting insert for heavy cutting, and more particularly to a chipbreaker having one or more curved curved cutouts provided on one side of the cutouts at a height lower than the height of the cutouts. By providing a cutting insert that can reduce the machining load by reducing the contact portion of the chip during high cutting, and the chip can be cut in the longitudinal direction to induce the optimum chip curl to extend the tool life due to the reduction of resistance will be.

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In general, the cutting tool is mainly used for cutting iron-based, non-ferrous metals, non-metal materials, is a tool that is usually mounted on a machine tool to perform the cutting to process the workpiece to the desired shape. Typically, such cutting tools consist of a cutting insert with a cutting edge and a cutter body for holding the cutting insert.

In addition, the cutting tool can be divided into brazing type and indexable type according to the method of fixing the cutting insert to the cutter body. The brazing type brazes the cutting insert to a part of the cutter body. It is to fix permanently, the indexable type is to mount and detach the cutting insert to the cutter body using the fixing means provided in the cutter body.

Indexable cutting tools can be easily replaced with new picklings in a short time when the picklings reach their end of life, thus reinforcing the problems of the brazing type cutting tools, ie the disadvantage of having to regrind the edges for a long time. As a tool, it is currently used in all parts of cutting tools.

On the other hand, there are two main methods for cutting metal using a cutting tool. First, cutting is performed by contacting a pickled portion of a cutting tool fixed to a rotating metal workpiece. Secondly, a tool having a cutting edge, i.e., a cutting insert, is fixed to a machine tool using a tool holder, and then the cutting tool is rotated under such a state, while contacting or penetrating a workpiece to be fixed beforehand. It is processed into a shape. Recently, efforts have been made to improve the shape of the cutting insert and the coupling structure of various cutter bodies in order to reduce the resistance during machining, improve the life of the tool, and improve the processing quality.

Among the above-mentioned cutting inserts, heavy cutting inserts such as train wheel machining operations are classified into two types. These cutting inserts are round-shaped (R-type) inserts used to newly operate wheels, and mainly It is classified as a rectangular (L-shaped) cutting insert for maintenance.

However, in the case of the L-type cutting insert described above, as in the case of the R-type, when the current workpiece is large and the processing conditions are slow, and in the case of imitation processing, the chips are not smoothly processed and wound on the equipment. There was a problem that the machining is not easy.

The present invention has been made to solve the conventional problems as described above, the object of the present invention is provided with one or more curved curved slats provided at a height lower than the height of the slabs on one side of the main temples made of a multi-stage With the chip breaker, the cutting load can be reduced by reducing the contact area of the chip when it is severely cut, and the chip can be cut in the longitudinal direction to induce the optimum chip curl to extend the tool life due to the decrease in resistance. To provide inserts.

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

It has an upper surface and a lower surface, and has a corner cut provided in the four corners of the upper surface and the lower surface, and a major cut and a sub-pick to connect each edge cut, and on the top and the bottom surface chip breaker In the cutting insert formed,

On both sides of each of the main pickles adjacent to the edge pickles, curved main pickles are formed along the main pickles and bent to a height lower than the height of the main pickles. It forms a mold-in, and the curved columnar is made up of an inclined portion extending from the edge to the center portion of the main temple, and the first floor portion provided with a convex curvature from the extended end of the slope to the center of the main temple. The recessed recess provides a cutting insert that induces an optimal chip curl that is provided at an incline that is lowered from the corner to the center of the recess.

As described above, according to the present invention, by providing a chip breaker consisting of a multi-stage chip breaker provided with one or more curved curved slats provided at a height lower than the height of the slabs, By reducing the contact area, the machining load can be reduced, and the chip can be cut in the longitudinal direction, thereby extending the tool life due to the reduced resistance.

Hereinafter, with reference to the accompanying drawings will be described a cutting insert for inducing an optimal chip curl according to an embodiment of the present invention.

1 is a perspective view showing a cutting insert for inducing an optimal chip curl according to the present invention, Figure 2 is a plan view of the cutting insert shown in Figure 1, Figure 3 is a view of the cutting insert in "A" of FIG. 4 is a view of the cutting insert in "B" of FIG.

1 to 4, the cutting insert 100 for inducing the optimum chip curl according to the present invention is mainly a process using a powder metallurgy method, that is, a process such as mold pressure, PIM (Power Injection Mold), sintering, etc. It is produced using.

The cutting insert 100 according to the present invention has an approximately vertical rectangular parallelepiped shape, and has an upper surface 102 and a lower surface 104, and an upper surface 102, which are selectively used when cutting ferrous or nonferrous metals. One side and the other side of the lower surface 104, the main side 106 and the sub-side 108 connecting one end and the other end, and the edge side surface connecting the adjacent main side 106 and the sub-side 108 in a curve ( 110, which is formed in the center of the main side surface 106, the circular opening 112 penetrating toward the other main side surface 106 facing.

Each corner side 110 meets the top surface 102 and the bottom surface 104 to form a corner cut 114, respectively, and each major side 106 is the top surface 102 and the bottom surface 104. And each form a major cutout 116, and each sublateral surface 108 meets an upper surface 102 and a bottom surface 104 to form a respective subcutaneous 118.

On both sides of each of the main section 116 adjacent to the corner section 114, the curved section section 120 is formed along the main section 116 and provided to be curved to a height lower than the height of the corner section (114) do. On the other hand, the buoy 118 has a recessed buoy 130, which is provided at a height lower than the height of the edge pickle 114, similar to the curved main section 120.

Curved main section 120 has an inclination (122) extending from the corner section 114 to the center portion of the main section 116 along the main section 116, the inclined portion 122 and the inclined section ( The first floor 124 provided with the curvature r1 convex to the central portion of the main section 116 at the extended end of 122 and the main section 116 at the extended end of the first floor 124 as well. The second floor portion 126 is provided with a convex curvature r2 and maintains a first distance 124 and a predetermined distance S1. Between the first floor portion 124 and the second floor portion 126 is provided a connection portion 128 connecting the first floor portion 124 and the second floor portion 126 with concave curvature r1-2. .

In this case, the inclined portion 122 is provided in a straight line having an inclination α1 of 2 to 40 °, and the first floor portion 124, the second floor portion 126, and the connecting portion 128 have a radius of 0.5 mm or more. It is provided by curvatures r1, r, r1-2. The tops of the first ridge 124 and the second ridge 126 are also provided lower than the edges 114, wherein the tops of the first ridge 124 and the second ridge 126 are edged ( 114) has a difference in height T2 of 0.05 to 1.0 mm lower than the top. In addition, the uppermost portion of the corner pick-up 114 and the connection portion 128 has a height T1 of 0.5 to 5.0 mm. And the uppermost part of the 1st floor part 124 and the 2nd floor part 126 keeps distance S1 1.0 mm or more. Preferably, both sides of the first floor 124 and both sides of the second floor 126 may be provided in a straight line having inclinations α2 and α3 of 2 to 40 °.

On the other hand, the recessed recessed part 130 formed in the recessed part 118 is provided as a slope (α4) lowered from the corner section 114 to the center portion of the section section 118, wherein the corner section 114 and the section The lowest part of the phosphorus 118 has a height difference of 0.05-2.5 mm. Preferably, the recessed recess 130 may be provided with a curvature having a height difference of 0.05 mm to 2.5 mm from the lower edge 114.

FIG. 5 is a cross-sectional view taken along the line C-C of FIG. 2. As shown in the upper portion of the cutting insert 100 according to the present invention is formed a chip breaker 140 consisting of a plurality of stages.

The chip breaker 140 may include a front chip breaker 142 extending lower from the corner cut 114, the main cut 116, and the sub cut 118 to the center of the upper surface 102 or the lower surface 104. The first rear chip breaker 146 is formed at the extension side of the front chip breaker 142 and the second rear chip breaker 148 is formed at the extension side of the first rear chip breaker 146. ).

The front chip breaker unit 142 extends at an inclination of 10 to 40 ° to induce chipcurl induction and a reduction in cutting resistance. The front chip breaker unit 142 extends at each corner cutting 114. One or more chip breaker protrusions 144 protrude from each other, and one or more chip breaker protrusions 144 protrude from the front chip breaker portion 142 extending from each curved columnar 120. At this time, the top of the chip breaker protrusion 144 is provided 0 ~ 0.5mm lower than the edge cutting 114 and the main cutting 116. In addition, the uppermost portion of the chip breaker protrusion 144 is formed at a position spaced at a distance (L1) of 0.5 ~ 4.0mm from the corner cutting 114 and the main cutting 116.

The first rear chip breaker portion 146 is provided in various curved shapes in the extension portion of the front chip breaker portion 142. The first rear chip breaker portion 146 extends to the front chip breaker portion 142. The top is provided within a range of ± 5 mm above the height of the edge cutting 114 and the main cutting 116 as it rises from 10 to 50 ° inclination c1. In addition, the first rear chip breaker 146 is formed at a position spaced apart from the front chip breaker 142 by a distance L2 of 0.5 to 5.0 mm.

On the other hand, the second rear chip breaker unit 148 is provided in various curved forms along the first rear chip breaker unit 146 in the extension of the first rear chip breaker unit 146, the second rear chip breaker unit 148 is raised to the first rear chip breaker portion 146 by 15 to 55 ° inclination c2 on the extension side, and the uppermost portion is provided 0.05 to 1.0 mm higher than the top of the first rear chip breaker portion 146. . In addition, the second rear chip breaker 148 is formed at a position spaced apart from the corner pickling 114, the main cutting 116 and the subcutaneous 118 by a distance L3 of 0.5 to 6.0 mm.

6 is a view illustrating a state in which the cutting insert illustrated in FIG. 1 is mounted in a holder. The cutting insert 100 formed as described above is mounted to the holder 10, and for this purpose, an insert sheet 20 in which the cutting insert 100 is placed is provided at the front end of the holder 10. The cutting insert 100 placed in the insert sheet 20 is fastened to the insert sheet 20 by a fastening bolt (not shown) passing through the circular opening 112.

As such, the curved cutout 120 of the cutting insert 100 mounted on the holder 10 is formed lower than the cutout 116, thereby reducing the portion of the chip directly contacting the cutout 116 during high cutting. The processing load of 116 can be reduced, and also the effect of cutting the chip in the longitudinal direction can be obtained, thereby reducing the resistance and improving tool life.

When the chip is cut by the chipbreaker 140 formed in multiple stages, the chip flow can be induced by reducing the interference and resistance in the flow of the chip as much as possible, and the cutting resistance and chip breaking can be performed during the cutting. do.

As described above, the cutting insert 100 for inducing the optimal chip curl according to the present invention is a curved columnar section having a height lower than the height of the columnar section 116 in the columnar section 116 adjacent to the corner section 114. By forming the chip 120 and forming the chip breaker 140 having a plurality of stages on the upper surface 102 and the lower surface 104, it is possible to reduce the processing load by reducing the contact portion of the chip at the time of aging. Cutting in the longitudinal direction has the advantage of extending the tool life due to reduced resistance.

In addition, it can be used for machining such as train wheels, that is, for heavy cutting, and also has a cutting insert because it can be smoothly processed even under low working conditions or copying (curving). It is possible to improve the service life of 100).

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 (10)

It has an upper surface and a lower surface, and provided with four corners of the upper surface and the lower surface of the edge pickling, and each of the edge pickles and the main pickle to connect the edge pickle, the upper surface and the lower surface In the cutting insert on which the chipbreaker is formed, On both sides of each of the main pickles adjacent to the edge pickles are formed along the main pickles and formed curved main pickles provided by bending at a height lower than the height of the edge pickles. And forming a recessed recessed artisan provided at a low height, wherein the curved main artisan is an inclined portion extending inclined from the corner articulated to the central portion of the main articulated artefact, and from the extended end of the inclined section to the central portion of the main artisan And a recess formed in a convex curvature, wherein the recessed recess is provided at an inclination lowering from the corner cut to the center portion of the recess. According to claim 1, The second end of the first floor is provided with a convex curvature while maintaining a constant distance at the extended end of the first floor portion is further formed, The first floor portion and the second floor portion is a connection portion provided with a concave curvature Cutting inserts that induce optimal chip curl, characterized in that the connection. The method of claim 2, wherein the inclined portion is provided in a straight line having an inclination of 2-40 °, wherein the first floor portion, the second floor portion and the connecting portion is characterized in that the radius of curvature of 0.5mm or more Cutting inserts for optimum chip curl. The uppermost part of the first floor portion and the second floor portion is provided at a low height of 0.05 to 1.0 mm at the top of the edge pickling, and the bottom end of the connecting portion is 0.5 to 5.0 at the top of the edge cutting. A cutting insert for inducing optimum chip curl, characterized in that it is provided at a low height of mm. The cutting insert according to claim 2, wherein the uppermost part of the first floor portion and the second floor portion are formed to be spaced apart while maintaining a distance of 1.0 mm or more. 3. The cutting insert as claimed in claim 2, wherein both sides of the first ridge and both sides of the second ridge may be provided in a straight line having an inclination of 2 to 40 degrees. The cutting insert according to claim 1, wherein the lowermost end of the recessed recess is provided at a height of 0.05 mm to 2.5 mm at the corner recess. The cutting insert according to claim 1, wherein the recessed recess may be provided with a curvature having a height of 0.05 to 2.5 mm at the lowermost corner. The chip breaker of claim 1, wherein the chip breaker is a front chip breaker portion extending from the corner cut, the main cut and the sub cut to be lowered toward the center of the upper surface or the lower surface, and the extension side of the front chip breaker. A first rear chip breaker portion formed on the second rear chip breaker portion formed on the extension side of the first rear chip breaker portion, and the front chip breaker portion 10 to induce chip curl induction and reduction of cutting resistance. At least two chip breaker protrusions protrude from the front chip breaker portion extending at an inclination of 40 ° and extending at the edge pick-up, and at least one chip at the front chip breaker portion extending from each curved cutout. A breaker protrusion is formed to protrude, and the first rear chip breaker part has various curves in an extension of the front chip breaker part. In addition, the front chip breaker is inclined at an angle of 10 to 50 ° from the extension side, and the uppermost part is provided within a range of ± 5 mm from the height of the edge cutting and the main cutting, and the second rear chip breaker is The first rear chip breaker is provided in the form of various curves along the first rear chip breaker portion from the extension portion, while the first rear chip breaker portion is increased in the inclination by 15 to 55 ° from the extension side, the top portion is the first rear chip Cutting insert for inducing optimum chip curl, characterized in that provided 0.05 ~ 1.0mm higher than the top of the breaker. 10. The method of claim 9, wherein the top of the chip breaker protrusion is provided at 0 ~ 0.5mm lower than the edge cutting and the main cutting and formed at a position spaced 0.5 to 4.0mm away from the edge cutting and the main cutting, The first rear chip breaker part is formed at a position spaced apart from the front chip breaker part by a distance of 0.5 to 5.0 mm, and the second rear chip breaker part is the corner cutout, the major cutout and the subcutaneous cutout, and 0.5 to 6.0 mm. Cutting inserts for inducing optimal chip curl, characterized in that formed at positions spaced apart.

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