KR102146314B1 - 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 including an upper surface, a lower surface, a side surface, a cutting edge, and a fastening hole penetrating the upper surface and the lower surface, wherein the upper surface is in a direction from the cutting hole to the fastening hole. It includes an upwardly inclined upper surface fastening surface, and the lower surface includes a lower surface fastening surface that is inclined downward in the direction of the fastening hole from the cutting edge, and a wedge-shaped fastening structure by the lower surface fastening surface when the cutting insert is mounted on a cutting tool It is characterized by forming a.

Description

Cutting insert and tool mounted withthere {Cutting insert and Tool mounted withthere}

The present invention relates to a cutting insert and a cutting tool equipped with the cutting insert.

In general, a cutting insert is fastened to a cutting tool mounted on a machine tool, and is used for cutting a workpiece, such as a machine part made of iron, non-ferrous metal, and non-metal material.

The cutting insert includes an upper surface, a lower surface facing the opposite direction, and a side surface connecting the upper surface and the lower surface, and a pickled cutting which substantially cuts the workpiece while forming a boundary between the upper surface and the side surface.

Meanwhile, in FIGS. 7 to 9, a cutting insert disclosed in Korean Patent Laid-Open Patent No. 2010-0132830 is shown. For reference, FIGS. 7, 8, and 9 correspond to FIGS. 8, 13, and 7 of the Korean Patent Application, respectively, and for convenience of explanation, reference numerals used in the Korean Patent Application No. It has been used as it is, and these reference numerals do not refer to the same components even if they overlap with reference numerals used in the description of the present invention to be described later.

The cutting insert 20 includes a polygonal upper surface 21, a lower surface 22 supported by the lower support surface of the insert seat, and a plurality of side surfaces 23 connecting the upper surface and the lower surface. do.

The upper surface 21 of the cutting insert 20 includes a concave portion 25 having a plurality of inclined surfaces in the center direction.

The wedge 50 is a cutting insert ( It has a protrusion 55 for pressing 20).

However, in order to fasten the cutting insert 20 to the cutting tool, various components such as the wedge 50 and the slot 30 for receiving the wedge are used in a complex manner, thereby reducing the rigidity of the cutting tool and also when replacing the cutting insert. There is a problem that takes a lot of time.

Korean Patent Application Publication No. 2010-0132830 (Publication date: 2010. 12. 20.)

The present invention is to solve the above-described problems, and the present invention improves the fastening property so that the cutting insert can be simply fastened to the cutting tool with only a screw without the use of complicated parts, and the fastening surface wear due to chip flow It is an object of the present invention to provide a cutting insert and a cutting tool equipped with it.

In order to achieve the above object, the cutting insert according to an embodiment of the present invention is a double-sided cutting insert including an upper surface, a lower surface, a side surface, a cutting, and a fastening hole penetrating the upper surface and the lower surface, the upper surface The cutting edge includes an upper surface fastening surface inclined upward in the direction of the fastening hole, and the bottom surface includes a bottom fastening surface inclined downward from the cutting in the fastening hole direction, and when the cutting insert is mounted on a cutting tool, the bottom surface It is characterized in that it forms a wedge-shaped fastening structure by the fastening surface.

In addition, the upper and lower surfaces are provided with a chip breaker surface adjacent to the pickles, and the chip breaker surface includes a concave recessed groove.

In addition, a protrusion is formed between the chip breaker surface and the upper surface fastening surface, and between the chip breaker surface and the lower surface fastening surface.

In addition, one end of the protrusion is connected to the groove, and the other end of the protrusion is connected to the upper surface and the lower surface, respectively.

In addition, the cutting insert is characterized in that the upper and lower surfaces have the same shape and are symmetrical around a central axis of the fastening hole.

In addition, the side surface has a clearance surface, and the clearance surface is formed in a negative type.

In addition, the protrusion is characterized in that it is formed without a break to surround the fastening hole along the cut.

In addition, the pickled cuttings include a corner portion between the four main cutting edges and each of the main cutting edges, and the groove portion of the chip breaker surface is formed in a predetermined length adjacent to the corner portion in the main cutting edges.

In addition, the groove portion is characterized in that each corner portion has two partial grooves spaced apart from each other.

In addition, the upper surface fastening surfaces include four partial upper surface fastening surfaces spaced apart from each other at intervals of 90 degrees, and are formed in a plane.

A cutting tool according to an embodiment of the present invention is equipped with the above-described cutting insert of the present invention.

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

In the present invention, the lower surface is formed into a V-shaped and convex downwardly protruding shape, and when the cutting insert is mounted on the cutting tool, it is fastened to the mounting surface of the cutting tool in a wedge shape. The cutting insert can be stably fastened with just a screw to the center cutting tool.

In addition, during cutting, the protrusion effectively prevents the moving chips separated from the workpiece from hitting the fastening surface while contacting the fastening surface to wear the fastening surface. In particular, by making one end of the protrusion directly connected to the groove, the chips separated from the work material are better dried.

In addition, the protrusion portion is formed to protrude in an annular or octagonal shape without interruption so as to surround the fastening hole along the cut and corner portions, thereby increasing the rigidity of the cutting insert.

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

1 is a perspective view of a cutting insert according to an embodiment of the present invention.
2 is a plan view of the cutting insert of FIG. 1.
3 is a cross-sectional view of the cutting insert of FIG. 2 in the BB direction.
4 is a cross-sectional view in which the cutting insert of FIG. 1 is mounted on a cutting tool.
5 is a view for explaining the clearance surface of the cutting insert of FIG. 1.
6 is a cutting tool to which the cutting insert of FIG. 1 is mounted.
7 is a perspective view of a conventional cutting insert.
8 shows a wedge used to mount the cutting insert of FIG. 7 to a cutting tool.
9 is a cross-sectional view showing a state in which the cutting insert of FIG. 7 is mounted on a cutting tool using the wedge of FIG. 8.

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

As shown in Figure 1, the cutting insert 100 according to an embodiment of the present invention is a double sided cutting insert (hereinafter referred to as'cutting insert'), the upper surface (1), the lower surface (2), side (3), cuttings (4), and includes a fastening hole (5). This cutting insert 100 corresponds to a so-called radial type cutting insert in which the fastening hole 5 penetrates the upper surface 1 and the lower surface 2.

On the other hand, the double-sided cutting insert means that when the lower surface is used as a fastening surface with the cutting tool, the upper surface is used as an inclined surface. It refers to a cutting insert whose lower surface can be used as an inclined surface. Therefore, hereinafter, for convenience of explanation, as shown in FIG. 3, the upper surface 1 is used as a rake surface and the lower surface 2 is used as a mounting surface with a cutting tool. However, the same description may be applied to the case of using it upside down.

1 to 3, in the present cutting insert 100, the upper surface 1 includes an upper surface fastening surface 11 that is inclined upward in the direction of the fastening hole 5 from the cut 4, and similarly The lower surface 2 also includes a lower surface fastening surface 21 inclined downward from the cutting edge 4 toward the fastening hole 5. It is preferable that the upper and lower fastening surfaces 11 and 21 are flat. The cutting insert 100 may have a substantially rectangular shape when the cutting edge 4 is used as a reference, and may have an approximately octagonal shape when including a corner portion 7 to be described later.

On the other hand, as shown in Figure 2, these upper and lower fastening surfaces (11, 21) may be provided with four partial upper and lower fastening surfaces (111, 211) separated by 90 degree intervals. Of course, if necessary, it may be configured with a single upper and lower surface fastening surfaces 11 and 21 that are not separated from each other.

Through this, as shown in Figs. 3 and 4, the lower surface fastening surface 21 of the cutting insert 100 has a shape protruding convexly downward in a V-shape (that is, both sides of the fastening hole 5). The extension lines (L1, L2) of the lower surface fastening surface 21 located at are formed at an angle less than 180 degrees), and when the cutting insert 100 is mounted on the cutting tool (C), the cutting tool (C) has a wedge shape Can be fastened to the mounting surface. Through this, since it is possible to improve the fastening force between the cutting insert 100 and the cutting tool C, it is possible to stably fasten the cutting insert with only a screw to the cutting tool of a machining center that is gradually increasing in speed to improve productivity.

In addition, referring to FIG. 5, the side surface 3 of the cutting insert 100 has a negative-type relief surface 31. Accordingly, when the cutting insert 100 is mounted on the cutting tool C, it is possible to secure the as large as possible a fastening area with the cutting tool C, thereby further improving the fastening stability. Here, the term'negative type' refers to a case where the extension line of the clearance surface 21 is parallel to the central axis A of the fastening hole 5, as shown in FIG. 5. For reference, the term'positive type' refers to a case in which the clearance surface is inclined so that the extension line (virtual line B) of the clearance surface and the central axis (A) of the fastening hole 5 form an acute angle (α). .

On the other hand, as shown in Figure 2, the cutting edge (4) is formed in four positions corresponding to the four main cutting edge (41) to each of the partial upper surface (111). A corner portion 7 may be formed between these pickles 4.

In addition, as shown in FIGS. 2 and 3, on the upper surface 1, a chip breaker surface 12 for flowing chips separated from the workpiece is formed adjacent to the pickles 4, and the chip breaker surface 12 ) Is formed with a recessed groove 121 is formed. Likewise, a chip breaker surface 22 is formed adjacent to the cutting edge 4 on the lower surface 2 as well, and a concave recessed groove 221 is formed in the chip breaker surface 22. The groove portion 221 has two partial grooves spaced apart from each other in each corner portion 7.

When processing a workpiece with this cutting insert 100, cutting resistance is mainly generated in the area close to the corner part 7 from the main cutting edge 41, and taking into account that chips are generated and flowed, the chip breaker surface 22 As shown in Fig. 2, the main cutting edge 41 close to the corner part 7 can be formed to have a predetermined length. Through this, it is possible to minimize the amount of material removed from the upper and lower surfaces of the cutting insert, thereby maintaining the stiffness of the cutting insert.

In addition, protrusions 6 are formed between the chip breaker surface 12 and the upper surface fastening surface 11, and between the chip breaker surface 22 and the lower surface fastening surface 21, respectively. Here, one end (left end in Fig. 3) of the protrusion 6 is smoothly connected to the grooves 121 and 221, and the other end of the protrusion 6 (right end in Fig. 3) is smoothly on the upper and lower surface fastening surfaces 11 and 21. It follows.

During cutting, the chips separated from the workpiece are allowed to flow through the grooves 121 of the chip breaker surface 12 so that the chips are dried rapidly, and the chips flowing from the chip breaker surface 12 are fastened to the fastening surface 11 ) The protrusion 6 effectively prevents abrasion of the fastening surface 11 by hitting it while in contact. In particular, by making one end of the protrusion 6 directly connected to the groove 121, the chips separated from the work material are more easily curled. Of course, these protrusions 6 may be formed to be spaced apart from the grooves 121 and 221.

In addition, referring to FIG. 2, when looking down the upper surface, the protrusions 6 are seamlessly formed to surround the fastening holes 5 along the cuticles 4 and the corners 5, so that the cutting insert 100 It can increase the rigidity. Specifically, the overall shape of the protrusion 6 may be formed in an annular or approximately octagonal shape. On the other hand, when forming the protrusion 6 in an octagonal shape, it is preferable to form each corner so as to be located near the center of the pickled and the center of the corner.

In this way, the groove portion 121 may be partially formed around the corner portion 7 on the upper surface, and the protrusion portion 6 may be formed entirely on the upper surface.

On the other hand, the cutting insert 100 may have the same shape of the upper surface (1) and the lower surface (2), and is symmetrical about the central axis (A) of the fastening hole (5).

Hereinafter, a cutting tool C in which the cutting insert 100 is mounted according to an embodiment of the present invention will be described.

As shown in FIG. 6, the cutting tool C includes a plurality of pockets 200 in which the cutting insert 100 is mounted.

Each pocket 200 is in contact with the fastening surface sheet 201 in contact with the fastening surface 21 of the lower surface 2 of the cutting insert 100, and the two clearance surfaces 21 adjacent to each other of the cutting insert 100 It has two clearance surface sheets 202, and a hole 203 in which the fastening bolt is fixed.

Here, the fastening surface sheet 201 of the pocket 200 is formed to be concave corresponding to the convex shape of the lower surface 2 of the cutting insert 100. Therefore, since the cutting insert 100 is mounted in the pocket 200 of the cutting tool C in a wedge structure, the fastening force can be increased, so that the cutting insert can be stably fastened to the cutting tool even in a high-speed processing environment. In addition, by forming the clearance surface of the cutting insert 100 in a negative type to maximize the area in contact with the clearance surface sheet 202 of the cutting tool pocket, it is possible to further increase the fastening stability.

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 by those skilled in the art using the basic concept of the present invention defined in the following claims are also present. It belongs to the scope of rights of

100...cutting insert
1...top, 2...bottom
3...side, 4...pickled
5...fastening hole, 6...protrusion
11,21...top, bottom side
12...Chipbreaker side
31...
121,221... groove
C...cutting tools

Claims (11)

As a double-sided cutting insert that can be fastened to a cutting tool without using a wedge,
It includes an upper surface, a lower surface, a side surface, a cutout, and a fastening hole penetrating the upper surface and the lower surface,
The upper surface includes an upper surface fastening surface inclined upward in the direction of the fastening hole in the cutting,
The lower surface includes a lower surface fastening surface inclined downward in the direction of the fastening hole in the cutting,
When the cutting insert is mounted on the cutting tool, it is fastened in a wedge shape to the cutting tool by the lower surface fastening surface supported by contact with the cutting tool,
A chip breaker surface is provided adjacent to the pickled in the upper and lower surfaces,
The chip breaker surface includes a concave recessed groove
Cutting insert. delete In claim 1,
A cutting insert having a plurality of protrusions formed between the chip breaker surface and the upper surface engaging surface, and between the chip breaker surface and the lower surface engaging surface. In paragraph 3,
One end of the plurality of protrusions is connected to the groove, and the other end of the plurality of protrusions is connected to the upper surface and the lower surface, respectively. In claim 4,
The cutting insert has the same shape on the upper surface and the lower surface, and is symmetrical about a central axis of the fastening hole. In claim 1,
The side surface has a clearance surface, the clearance surface is a cutting insert formed in a negative type. In claim 4,
The plurality of protrusions are cutting inserts formed to be seamlessly connected to each other so as to surround the fastening hole along the cut. In clause 7,
The cutting insert includes four main cutting edges and a corner portion between each of the main cutting edges, and a groove portion of the chip breaker surface has a predetermined length adjacent to the corner portion in the main cutting edge. In clause 8,
The cutting insert having two partial grooves spaced apart from each other in each of the corner portions. In claim 1,
The top face fastening surface includes four partial top fastening faces spaced at 90 degrees apart from each other, and a cutting insert formed in a plane. A cutting tool equipped with a cutting insert according to any one of claims 1 to 10.

Images