KR102545965B1 - Double sided Cutting insert and Tool mounted withthere - Google Patents

Abstract

A cutting insert according to an embodiment of the present invention is a double-sided cutting insert mounted on a cutting tool and including five corner portions, and the cutting insert includes an upper surface, a lower surface, a side surface connecting the upper surface and the lower surface, the upper surface and the lower surface. A fastening hole penetrating the lower surface, and a cutout portion formed where the upper and lower surfaces are connected to the side surface, and the upper surface surrounds an inclined surface inclined in a direction from the cutout portion to the fastening hole and the fastening hole. It includes a boss surface extending to an inclined surface, and the cutting portion sequentially includes an inner main cutting edge, a sub cutting edge connected to the inner main cutting edge, and a main cutting edge connected to the sub cutting edge in a direction relatively away from the rotational axis of the cutting tool. Including, the angle formed by the extension line of the inner major edge and the extension line of the minor edge is smaller than the angle formed by the extension line of the secondary edge and the extension line of the main edge, and the upper surface and the lower surface are transverse to the center of the side surface It is characterized in that it is mirror symmetrical with respect to the plane that passes through and bisects the cutting insert.

Description

Double sided cutting insert and tool mounted with it {Double sided cutting insert and Tool mounted withthere}

The present invention relates to a double-sided cutting insert and a cutting tool equipped therewith.

In general, a cutting insert is fastened to a cutting tool mounted on a machine tool and is used to cut a workpiece such as a machine part made of iron, nonferrous metal, or nonmetallic material.

This cutting insert includes an upper surface, a lower surface facing in the opposite direction, a side surface connecting the upper surface and the lower surface, and a cutting edge that forms a boundary between the upper surface and the side surface and substantially cuts the workpiece.

Meanwhile, FIGS. 7 and 8 show a cutting insert disclosed in Japanese Patent Publication No. 5541366. 7 is a plan view of a conventional cutting insert, and FIG. 8 is a bottom view. 7 and 8 correspond to FIGS. 2 and 4 of the Japanese Patent Publication, respectively. For convenience of description, the reference numerals used in the Japanese Patent Publication are used as they are without modification, and these reference numerals will be described later. Even if they overlap with the reference numerals used in the description of the present invention, they do not refer to the same components. In addition, FIG. 8 simply rotates the original drawing by 180° to show that the cross sections 12 and 14 of the conventional cutting insert are the same.

This conventional cutting insert has a substantially pentagonal shape, and has a plurality of cutting portions 18 formed by intersections of the end surfaces 12 and 14 and the peripheral surface 16, respectively. Each cutting portion 18 includes a first cutting edge 18a and a second cutting edge 18b. When viewed in cross section, first corners 20 and second corners 22 having different interior angles are alternately formed in each cross section. The interior angle α of the first corner 20 is smaller than the interior angle β of the second corner 22 .

On the other hand, double-sided cutting inserts are being developed in various shapes such as triangular, quadrangular, pentagonal, hexagonal, heptagonal, octagonal, and circular types according to the purpose of use. And according to this shape, the double-sided cutting insert can perform high-cut face machining, profile machining, low-cut, high-feed machining, etc.

However, conventional double-sided cutting inserts are limited to high-cut face machining, and the end faces 12 and 14 have the same shape, so they cannot be used for low-cut, high feed, etc., and can not simultaneously perform two machining functions. It has the problems of the conventional cutting insert as it is.

Japanese Patent Publication No. 5541366 (registration date: 2014.5.16)

The present invention is to solve the problems as described above, and the present invention aims to provide a cutting insert that can be used from low cut and high feed machining as well as high cut surface machining with one cutting insert and a cutting tool equipped with the same. to be

In order to achieve the above object, the cutting insert according to one embodiment of the present invention is a double-sided cutting insert mounted on a cutting tool and including five corners, and the cutting insert includes an upper surface, a lower surface, the upper surface and the lower surface. A side surface connecting the , a fastening hole penetrating the upper and lower surfaces, and a cutout portion formed where the upper and lower surfaces connect to the side surface, respectively, and the upper surface is an inclined surface inclined from the cutout portion to the fastening hole direction. , A boss surface surrounding the fastening hole and extending to the inclined surface, wherein the cutting portion is sequentially in a direction relatively away from the rotational axis of the cutting tool, an inner peripheral edge, and a minor edge following the inner edge, It includes a main cutting edge connected to the sub-cutting mark, and an angle between the extension line of the inner main cutting edge and the extending line of the sub-cutting mark is smaller than an angle formed between the extending line of the sub-cutting mark and the extension line of the main cutting edge, and the upper surface and the lower surface are formed. is characterized in that it is mirror symmetrical with respect to a plane that passes through the center of the side surface in the transverse direction and bisects the cutting insert.

In addition, when fastening the cutting insert to the cutting tool, when the lower surface is used as a fastening surface, the cutting insert is used for low cut and high feed, and when the upper surface is used as a fastening surface, the cutting insert is used for high cut surface processing. It is characterized by being used as.

In addition, when viewed from the side, the sub-segments get closer to the plane as they move away from the corner, and the main cuts get further away from the plane.

In addition, when viewed from the side, the main joint formed on the upper surface is convex upward, and the main joint formed on the lower surface is formed convex downward.

The cutting insert according to the embodiment of the present invention having the above configuration has the following effects.

This cutting insert can selectively perform low-cut, high-feed machining and high-cut face machining with one product. Therefore, the conventional inconvenience of individually using cutting inserts with different depths of cut depending on the type of workpiece or the machining part of the workpiece can be resolved, and as a result, effects such as productivity improvement and cost reduction can be obtained during cutting. there is.

On the other hand, the present invention, although not explicitly described, of course includes other effects that can be expected from the above configuration.

1 is a perspective view of a cutting insert according to an embodiment of the present invention.
2 (a) illustrates a case in which the cutting insert of FIG. 1 is used for low cut and high feed, and FIG. 2 (b) illustrates a case in which the cutting insert of FIG. 1 is used for high cut face machining.
3 is a view of the cutting insert of FIG. 1 viewed from the side.
4 shows a virtual plane passing through the center of the side of the cutting insert of FIG. 1 and bisecting it.
5 shows a cutting tool to which the cutting insert of FIG. 1 is fastened.
6 (a) shows a state in which the cutting insert of FIG. 1 is fastened to a cutting tool for low cut and high feed, and FIG. 6 (b) is a state in which the cutting insert of FIG. 1 is fastened to a cutting tool for high cut face machining. exemplifies each.
7 and 8 show conventional cutting inserts.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can practice the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein.

As shown in FIGS. 1 and 2, the cutting insert according to one embodiment of the present invention is a double-sided cutting insert mounted on a cutting tool 200 and having a substantially pentagonal shape including five corner portions 6. (100).

For reference, double-sided cutting inserts, when the lower surface is used as a fastening surface with a cutting tool, the upper surface is used as an inclined surface; refers to a cutting insert whose lower surface can be used as an inclined surface. Therefore, hereinafter, for convenience of description, as shown in FIG. 1, the upper surface 1 is used as a rake surface, and the lower surface 2 located on the opposite side is used as a mounting surface with a cutting tool. The case is described as an example, but the same description may be applied even when it is reversed and used.

This cutting insert 100 has an upper surface 1, a lower surface 2, a side surface 3 connecting the upper surface 1 and the lower surface 2, and fastening holes passing through the upper surface 1 and the lower surface 2 ( 4), and a cutout 5 formed where the upper and lower surfaces 1 and 2 are connected to the side surface 3, respectively. Also, when the cutting insert 100 is viewed from the top (lower surface), it is clockwise or counterclockwise by 72°×n (n is a natural number) around the imaginary center line C1 penetrating the center of the fastening hole 4. It has the same shape when rotated in the direction.

The upper surface 1 includes an inclined surface 11 inclined in the direction of the fastening hole 4 from the cutout 5, and a boss surface 12 extending to the inclined surface 11 while surrounding the fastening hole 4. includes

Referring to FIGS. 2 and 6, the cutting part 5 is sequentially in a direction relatively away from the rotational axis R of the cutting tool, the inner main cutting edge 51 and the sub-cutting edge following the inner main cutting edge 51 ( 52), and the main indentation 53 following the subjunctive mark 52. For reference, the inner main 51 and the main 53 correspond to the same component adjacent to each other with the minor 52 interposed therebetween. In this specification, as shown in FIG. 6 for convenience of explanation, this When the cutting insert of the invention is mounted on a cutting tool, the component located on the relatively close side to the rotational axis (R) of the cutting tool is referred to as the inner edge (51), and the component located on the relatively far side is referred to as the main edge (53) to name each.

As shown in FIG. 2, the angle β formed by the extension of the inner major incision 51 and the extension of the sub-incision 52 is the angle formed by the extension of the sub-incision 52 and the extension of the main incision 51 ( α) is less than

In particular, as shown in FIGS. 2 to 4, in this cutting insert, the upper surface 1 and the lower surface 2 pass through the center of the side surface 3 in the transverse direction to a plane P that bisects the cutting insert. It is characterized by its mirror symmetry.

Through this, when the cutting insert 100 is fastened to the cutting tool 200, when the lower surface 2 is used as a fastening surface with the cutting tool 200, FIG. 2 (a) and FIG. 6 (a) As shown, this cutting insert 100 is used for low cut and high feed. For reference, FIG. 2 (a) and FIG. 6 (a) illustrate that the extension line of the main cutting edge 53 forms an angle of 15 ° with the workpiece bottom surface L for low infeed and high feed machining.

Conversely, when the cutting insert 100 is fastened to the cutting tool 200, when the upper surface 1 is used as the fastening surface with the cutting tool 200, it is shown in (b) of FIG. 2 and (b) of FIG. 6 As described above, this cutting insert 100 is used for high-cut face machining. For reference, FIG. 2 (b) and FIG. 6 (b) illustrate that the extension line of the main cutting edge 53 forms an angle of 55 ° with the bottom surface L of the workpiece for high-cut surface machining.

In this way, this cutting insert can perform low-cut, high-feed machining and high-cut surface machining with one product. Therefore, the conventional inconvenience of individually using cutting inserts with different depths of cut depending on the type of workpiece or the machining part of the workpiece can be resolved, and as a result, effects such as productivity improvement and cost reduction can be obtained during cutting. there is.

On the other hand, as shown in FIG. 3, when the cutting insert 100 is viewed from the side 3, as it moves away from the corner 6 (from left to right, based on FIG. 3), the sub-cut 52 It gets closer to the plane P, and the main joint 53 gets further away from the plane P.

In addition, when viewed from the side surface 3, the main cutting edge 53 formed on the upper surface 1 is convex upward, and the main cutting edge 53 formed on the lower surface 2 is convex downward.

In addition, the side surface 3 forms a so-called negative surface, the extension of which forms a perpendicular to the plane P as a clearance surface.

Hereinafter, with reference to FIGS. 5 and 6, the cutting tool 200 equipped with the cutting insert 100 according to an embodiment of the present invention having the above configuration will be briefly described.

The cutting tool 200 includes a plurality of pocket portions 201 in which the cutting inserts 100 are mounted.

The pocket portion 201 includes a fastening surface sheet portion 202 on which the lower surface 2 of the cutting insert 100 is seated, and a side sheet portion 203 on which some side surfaces 3 of the cutting insert 100 are seated. do.

A tool fastening hole 204 in which the fastening bolt 300 is mounted is formed in the fastening surface sheet portion 202 .

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also made according to the present invention. falls within the scope of the rights of

100...Cutting inserts
1...top, 2...bottom
3...side, 4...fastening hole
5 ... cutting part
51...inner main clause, 52...inside clause
53...
6 ... corner part
11...Slope
12... boss face

Claims (5)

A double-sided cutting insert mounted on a cutting tool and including five corners,
The cutting insert,
Upper and lower surfaces, side surfaces connecting the upper and lower surfaces, fastening holes penetrating the upper and lower surfaces, and cutouts formed where the upper and lower surfaces are connected to the side surfaces, respectively.
Including,
the upper surface
An inclined surface inclined in the direction of the fastening hole from the cut portion, and a boss surface extending to the inclined surface while surrounding the fastening hole.
Including,
The cutting part
Sequentially in a direction relatively away from the rotational axis of the cutting tool, an inner main edge, a sub-edge following the inner main edge, and a major edge following the sub-edge
Including,
An angle formed between the extension line of the inner major incisal mark and the extension line of the sub-incisal mark is smaller than an angle formed by the extension line of the sub-incisal mark and the extension line of the main incisal mark;
The upper surface and the lower surface are mirror symmetric with respect to a plane passing through the center of the side surface in a transverse direction and bisecting the cutting insert,
When fastening the cutting insert to the cutting tool,
When the lower surface is used as a fastening surface, the cutting insert is used for low cut and high feed,
When the upper surface is used as a fastening surface, the cutting insert is used for high-cut surface processing.
Characterized by a cutting insert. delete In paragraph 1,
From the above aspect,
As farther from the corner portion, the sub-segment mark gets closer to the plane, and the main cut-off mark gradually moves away from the plane.
Characterized by a cutting insert. In paragraph 3,
When viewed from the side, the main joint formed on the upper surface is convex upward, and the main joint formed on the lower surface is formed convex downward.
Characterized by a cutting insert. A cutting tool characterized in that the cutting insert according to any one of claims 1, 3 and 4 is mounted.

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