KR20050081858A - Milling cutter - Google Patents

Abstract

A cutting insert having a cuboid or a cuboid shape at both ends and having a first cutout portion and a second cutout portion formed at both ends and a cutting insert may be coupled to the backside. The cutter body is provided with a plurality of insert sheets so that the respective cutting edges and the main cutting edges formed on the first and second cutting edges of the cutting insert can be selectively rotated to cut the workpiece, thereby reducing the life of the cutting insert. A cutting milling cutter is disclosed which can be extended. The cutting insert according to the present invention comprises a cutter body having a plurality of insert sheets; And a cutting insert having a hexahedron shape so as to be fastened to the insert sheet in two directions.

Description

Milling cutter for cutting

The present invention relates to a milling cutter for cutting, and more particularly, has a cuboid or a cuboid shape to enable backside coupling, and at each end, first and second pickles are formed. The cutting insert and the cutter body in which a plurality of insert sheets are formed so that the cutting inserts can be coupled to the back surface are formed so that the respective cutting edges and the main cutting edges formed in the first and second pickling portions of the cutting insert can be removed. The present invention relates to a milling cutter for cutting that can selectively rotate to cut a workpiece, thereby extending the life of the cutting insert.

In general, a cutting tool is used to cut a workpiece of various materials, and is generally a tool that is mounted on a machine tool and performs cutting to make the workpiece into a desired shape.

The cutting tool is composed of a cutting insert having a picking for performing cutting directly and a cutter body for fixing the cutting insert.

On the other hand, using a cutting tool, there are two main methods for cutting metal, firstly cutting the rotating workpiece using a fixed cutting tool, secondly a tool with a cutting edge Rotate to process the workpiece is fixed.

Milling processing belongs to the second method of the above-described processing method, using the milling cutter to perform the plane processing, side processing, groove processing, hole processing and the like.

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 when cutting using the milling cutting tool, improve the life of the tool, and improve the processing quality.

However, the cutting insert described above has a structure in which only one surface of the cutting insert is coupled to the cutter body even if the cutting inserts are formed at both ends thereof, so that only a part of each of the cutting edges and the main cutting edges formed at each cutting portion can be used. There was no problem in reducing the life of the cutting insert.

The present invention has been made to solve the above-mentioned conventional problems, the object of the present invention is to have a cube or cuboid shape so as to enable a back-side coupling, while the first section at both ends Each of the cutting inserts formed with the second and second pickled portions and a cutter body having a plurality of insert sheets formed thereon so that the cutting inserts can be coupled to the back surface are formed, thereby forming the first and second pickled portions of the cutting insert. The present invention provides a milling cutter for cutting which can cut a workpiece by selectively rotating the edge cutting and the cutting edge of the cutting edge.

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

A cutter body having a plurality of insert sheets; And

It provides a cutting milling cutter including a cutting insert having a hexagonal shape to be fastened to the insert sheet in two directions.

Preferably, the cutting insert has a through hole penetrating to the insert lower surface side on the insert upper surface, and the first and second cutting portions having the same shape are formed on one end surface and the other end surface of the cutting insert.

More preferably, the insert sheet is formed radially inwardly of the cutter body while maintaining equal intervals along the circumferential direction on the circumferential surface of the cutter body, and the first coupling screw hole and the second coupling screw hole are formed on the sheet upper surface and the inner surface of the sheet. The clamp screw penetrating the through hole of the cutting insert is fastened to the first coupling screw hole and the second coupling screw hole so that the cutting insert can be fastened to the insert sheet.

On the other hand, the cutting insert has a shape of either a cube or a cube.

As described above, according to the present invention, there is provided a cutting insert having a cuboid or a cuboid shape so as to enable backside coupling, and having a first cutout portion and a second cutout portion formed at both ends thereof; By having a cutter body in which a plurality of insert sheets are formed so that the cutting inserts can be coupled to the back surface, the respective cutting edges and the main cutting edges formed in the first and second cutting portions of the cutting insert are selectively rotated. The workpiece can be cut to extend the life of the cutting insert.

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

1 is an exploded perspective view illustrating an exploded view of a cutter body and a cutting insert of a cutting mill cutter according to the present invention, and FIG. 2 is an enlarged perspective view of the cutting insert shown in FIG. 1.

1 and 2, the cutting milling cutter 100 according to the present invention is selectively coupled to the cutter body 110 and the cutter body 110 in two directions, that is, any one of the two sides (two sides) selectively It has a cutting insert 120 that is coupled.

First, the cutter body 110 is mounted on a main shaft (not shown) of a conventional machine tool. On the circumferential surface of the cutter body 110, a plurality of insert sheets 112 are formed radially inwardly of the cutter body 110 along the circumferential direction while maintaining equal intervals. At this time, the first coupling screw hole 116a and the second coupling screw hole 116b are formed on the sheet upper surface 114a and the sheet inner side 114b of each insert sheet 112, and each insert sheet ( Either of the first coupling screw hole 116a and the second coupling screw hole 116b of 112 may clamp the cutting insert 120 together with the cutting insert 120 so as to strongly fasten the cutting insert 120 to the insert seat 112. 118 is fastened.

The cutting insert 120 has the shape of a cube or a cube. An annular through hole 126 is formed on the insert upper surface 122 of the cutting insert 120 to penetrate toward the insert lower surface 124, and the first cutout 128a having the same shape on one end surface and the other end surface thereof. ) And a second pickled portion 128b are formed. At this time, the clamp screw 118 penetrates the through hole 126. Preferably, the cutting insert 120 has a length of the horizontal side x, a height z, and a length y of the vertical side having a ratio of 1: 1: 0.8 to 1.2. At this time, when the ratio of the length of the longitudinal side y is less than 0.8, not only the through hole 126 may be formed, but even if the through hole 126 is formed, the rigidity of the cutting insert 120 is weakened, and the longitudinal side y When the ratio of the length of the ()) exceeds 1.2, the material cost increases and the number of cutting inserts 120 coupled to the cutter body 110 is reduced, thereby reducing the cutting efficiency.

On the other hand, each of the corners of the first cutting portion (128a) and the second cutting portion (128b) of the cutting insert 120 is formed with an annular curved edge cutting 130, each of the edge cutting 130 In the main cutting edge 132 connecting each edge picking 130 is formed. At this time, the main cutting 132 contributes to the cutting while primarily grafting with the workpiece during cutting, it is made of a smooth curve. That is, each major cutting 131 is one side of the cutting insert 120 and around the other end surface, the upper surface of the insert 122, the lower surface of the insert 124, the one surface of the insert 134 and the other surface of the insert 136. It is formed to be curved to the central portion of the. On the other hand, each of the main cut-in 132 is formed with the main cut-in land surface 138 and the main cut-off inclined surface 140 inward in the first pickled portion (128a) and the second pickled portion (128b). Preferably, the respective cutting edges 130 on the first and second cut portions 128a and 128a, that is, the cutting insert 120, adjacent to each of the cutting edges 130, respectively. An identification mark 123 consisting of consecutive numbers is formed in an intaglio or embossed manner so as to be identified. In this case, 1 to 4 identification marks 123 are formed on the edge pickles 130 of the first pickled portion 128a, and 5 to 8 identification marks on the edge pickles 130 of the second pickled portions 128b. 123 is formed.

Hereinafter, a state in which the cutting insert 120 formed as described above is coupled to the cutter body 110 will be briefly described.

3 is a perspective view illustrating a state in which the cutting insert illustrated in FIG. 2 is mounted.

Referring to FIG. 3, first, in order to couple the plurality of cutting inserts 120 to the cutter body 110, the second coupling screw hole 116b formed in the insert sheet 112 and the insert upper surface 122 or the insert lower surface (124) face one of them. Preferably, the cutting insert 120 may be coupled to either the insert upper surface 122 or the insert lower surface 124 first. At this time, the second coupling screw hole 116b and the through hole 126 formed in the cutting insert 120 communicate with each other horizontally. Under such a state, the clamp screw 118 is inserted from the insert lower surface 124 and fastened to the second coupling screw hole 116a.

As such, when one cutting insert 120 is fastened to one insert sheet 112, another neighboring insert sheet 112 has a first coupling screw hole 116a and an insert upper surface 122 or an insert lower surface. Place (122) face to face. At this time, similarly, the first coupling screw hole 116a and the through hole 126 formed in the cutting insert 120 communicate vertically. Under such a state, the clamp screw 118 is inserted from the insert lower surface 124 and fastened to the first coupling screw hole 116a.

When the cutting insert 120 is repeatedly fastened to the insert sheet 112 by the above-described method, the cutting insert 120 fastened to any one insert sheet 112 is a cutting insert fastened to a neighboring insert sheet 112. 120 is rotated by 90 ° and fastened. That is, the operator may rotate the cutting insert 120 appropriately to use both the edge cutting 130 and the main cutting 132 formed in the first cutting portion 128a for cutting. On the other hand, when the service life of each of the corner pickling 130 and the main pickling 132 of the first pickling portion 128a is completed, the second pickling portion 128b is rotated to the cutting processing direction in the same manner as described above. The cutting process is performed by repeatedly tightening.

As described above, the cutting milling cutter 100 according to the present invention has the shape of a cube or a cuboid, and the first cutout 128a and the second cutout on one end face and the other end face. By having the cutting insert 120 having the portion 128b formed therein, the cutting insert 120 is inserted into the cutter body 110 in two directions, that is, the upper surface 122 or the lower surface of the insert through which the through hole 126 passes. 124 may be combined so that each of the edge pickles 130 and the main pickles 132 formed on the first pick-up portion 128a and the second pick-up portion 128b can be used for cutting, thus cutting insert 120 ) Has the advantage of extending the service life of the consumer to meet the consumer's purchasing needs.

In addition, the cutting insert 120 is formed by forming the first coupling screw hole 116a and the second coupling screw hole 116b on the sheet upper surface 114a and the sheet inner side 114b formed in the cutter body 110. Optionally rotated by 90 ° can be mounted to extend the service life of the cutting insert 120.

On the other hand, the identification display 123 adjacent to the edge cutting 130 of the cutting insert 120, there is an advantage that can easily determine the edge cutting 130 or the main cutting 132 used for cutting.

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.

1 is an exploded perspective view showing an exploded cutter body and a cutting insert of a cutting mill cutter according to the present invention;

2 is an enlarged perspective view of the cutting insert shown in FIG. 1, and

3 is a perspective view illustrating a state in which the cutting insert illustrated in FIG. 2 is mounted.

Explanation of symbols on the main parts of the drawing

100: cutting milling cutter 112: insert sheet

114a: sheet upper surface 114b: sheet inner side surface

116a: first coupling screw hole 116b: second coupling screw hole

118: clamp screw 120: cutting insert

126: through hole 128a: first pickled portion

128b: second pickled

Claims (9)

A cutter body having a plurality of insert sheets; And Milling cutter for cutting characterized in that it comprises a cutting insert having a hexahedral shape to be fastened to the insert sheet in two directions. The cutting insert according to claim 1, wherein the cutting insert has a through hole penetrating to the insert lower surface side on the insert upper surface, and the first and second cutting portions having the same shape are formed on one end surface and the other end surface of the cutting insert. Milling cutter for cutting, characterized in that. 3. The insert sheet according to claim 1 or 2, wherein the insert sheet is formed radially inward of the cutter body while maintaining an equal interval along the circumferential direction on the circumferential surface of the cutter body, A first coupling screw hole and a second coupling screw hole are formed on the side surface, and the first coupling screw hole and the second coupling screw hole penetrate the through hole of the cutting insert to fasten the cutting insert to the insert sheet. Milling cutter for cutting, characterized in that the clamp screw is fastened. The method according to claim 2, wherein each of the corners of the first and second pickled portion is formed to be bent corner cutting, between each of the corner cutting is formed with a main cut to connect each of the edge cutting Milling cutter for cutting. 5. The method according to claim 4, wherein each of the major cutting edges is formed to have a smooth curve curved around both ends of the cutting insert to the center of the insert upper surface, the insert lower surface, one side of the insert and the other side of the insert. Milling cutter for cutting. The cutting milling cutter according to claim 4, wherein each of the major cutting edges is formed with a main cutting edge land surface and a major cutting edge slope surface inward of the first and second cutting edge portions. The cutting milling cutter of claim 1, wherein the cutting insert has a cube shape. The cutting milling cutter of claim 1, wherein the cutting insert has a rectangular parallelepiped shape. The cutting mill according to claim 8, wherein the cutting insert has a ratio of the length of the transverse side (x), the height (z), and the length of the vertical side (y) of 1: 1: 0.8 to 1.2.