KR102538513B1 - Cutting insert and Tool mounted withthere - Google Patents

Abstract

According to an embodiment of the present invention, a cutting insert is mounted on a cutting tool and comprises: a top surface; a bottom surface; a side surface connecting the top surface and the bottom surface; a fastening hole penetrating through the top and bottom surfaces; and corner portions formed in regions in which the top and bottom surfaces extend to the side surface. The top surface includes: an inclined surface inclined from the corner portions toward the fastening hole; and a flat surface surrounding the fastening hole and extending to the inclined surface. The corner portions have, sequentially in a direction relatively away from the rotation axis of the cutting tool, an inner periphery corner, a sub corner extending to the inner periphery corner, a main corner extending to the sub corner, and a corner extending to the main corner. The top surface has a concave portion extending along the main corner across the inclined surface and the flat surface. Therefore, the cutting insert can achieve chip control, reduced cutting heat, reduced cutting resistance, and reduced vibration during high-feed cutting.

Description

Cutting insert and cutting tool equipped with it {Cutting insert and Tool mounted withthere}

The present invention relates to a 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.

Meanwhile, FIG. 8 shows a cutting insert disclosed in Korean Patent Registration No. 10-1130430. For reference, FIG. 8 corresponds to FIG. 7 of the Korean Registered Patent Publication, and for convenience of description, the reference numerals used in the Korean Registered Patent Publication are used as they are without modification, and these reference numerals are used as they are in the present invention to be described later. Even if they overlap with the reference numerals used in the description of, they do not refer to the same components.

This conventional cutting insert has a plurality of chips arranged along the inner boundary of the insert of the upper surface 25, the lower surface 27, a plurality of flank surfaces 26, a plurality of upper cutting edges 22, and an upper inclined surface 24. and an upper chip forming portion having a projection 28 for deflection.

However, in general, cutting inserts for high-feed machining use a cutting edge (22 in FIG. 8) at the tip, unlike cutting inserts for right angle machining, so the cutting diameter increases as it moves away from the central axis of rotation of the cutting tool, for example, the milling cutter. As it becomes large, the effective cutting speed is different for each specific position of the cutting edge of the cutting insert. Therefore, due to the difference in effective cutting speed, friction between the upper surface of the cutting insert and the chip causes cutting heat, processing load, and vibration. The conventional cutting insert is not effective in solving such cutting heat and processing load. There was a problem that didn't exist.

Korean Registered Patent Publication No. 10-1130430 (registration date: 2012.03.19.)

The present invention is to solve the above-described problems, and the present invention implements a shape capable of chip control on the upper surface of a cutting insert, thereby reducing chip control, reducing cutting heat, reducing cutting resistance, and reducing vibration during high-feed cutting. It aims to provide a cutting insert that can achieve this.

In order to achieve the above object, the cutting insert according to one embodiment of the present invention is mounted on a cutting tool, top and bottom surfaces, side surfaces connecting the top and bottom surfaces, fastening holes penetrating the top and bottom surfaces, and a cutout portion formed where the upper and lower surfaces are connected to the side surface, and the upper surface includes an inclined surface inclined in a direction from the cutout portion to the fastening hole, and a flat surface surrounding the fastening hole and extending to the inclined surface. And, the cutting portion is sequentially in a direction relatively away from the rotational axis of the cutting tool, an inner main cutting edge, a sub cutting edge following the inner main cutting edge, a main cutting edge following the sub cutting edge, and a corner cutting leading to the main cutting edge. Including, characterized in that a concave portion extending along the main joint across the inclined surface and the flat surface is formed on the upper surface.

In addition, the concave portion is characterized in that the width gradually increases as the distance from the rotational axis of the cutting tool increases.

In addition, in the main joint, the width (a) of the concave portion at the proximal point closest to the rotational axis of the cutting tool, the width (b) of the concave portion at the distal point furthest from the rotational axis of the cutting tool, and the proximal point The rotational diameter (Da) of and the rotational diameter (Db) of the distal point are characterized in that [Equation] b = Db/Da × a is satisfied.

In addition, it is characterized in that a plurality of grooves separated from each other across the inclined surface and the concave portion are disposed along the main joint.

In addition, each of the plurality of grooves is characterized in that the length from the main cutting edge toward the flat surface gradually increases as the distance from the rotational axis of the cutting tool increases.

In addition, each of the plurality of grooves is characterized in that, as the distance from the rotational axis of the cutting tool, the closer to the main cutting edge.

In addition, the cutting insert has three corner portions, and when viewed from the top surface, is 120°×n (n is a natural number) rotationally symmetrical with respect to a virtual center line passing through the center of the fastening hole, and the upper surface and the lower surface are It is characterized by having the same shape.

In addition, among the inclined surfaces, the main edge inclined surface extending along the main edge edge has a constant width, and the angle of inclination of the inclined surface is constant from the inner edge edge to the corner edge.

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

During cutting, the effective cutting speed increases from the sub-cutting edge to the corner cutting edge of this cutting insert, and the time the chip stays on the upper surface of the cutting insert increases. A concave portion and a plurality of grooves, the length of which gradually increases from the main cutting edge toward the flat surface and are spaced apart from each other, can be provided to constantly control the discharge direction of chips and efficiently reduce cutting heat.

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.
Figure 2 is a top view of the cutting insert of Figure 1;
3 is a view for explaining a plurality of grooves of the cutting insert of FIG. 1;
4 is a view showing an angle of an inclined surface in the cutting insert of FIG. 1;
5 is a side view of the cutting insert of FIG. 1;
Figure 6 shows a cutting tool equipped with the cutting insert of Figure 1.
Figure 7 shows the configuration of the pocket portion of the cutting tool of Figure 6.
8 shows a conventional cutting insert.

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 to 5, the cutting insert 100 according to an embodiment of the present invention is mounted on a cutting tool 200, and has an upper surface 1, a lower surface 2, and an upper surface 1 And the side surface 3 connecting the lower surface 2, the fastening hole 4 penetrating the upper surface 1 and the lower surface 2, and where the upper and lower surfaces 1 and 2 are connected to the side surface 3, respectively. It includes a formed cutout (5). And the cutting insert 100 has a substantially triangular shape when viewed from the top.

Meanwhile, the cutting insert 100 may be a double-sided cutting insert. For reference, in the double-sided cutting insert, when the lower surface is used as a fastening surface with a cutting tool, the upper surface is used as an inclined surface, and conversely, when the upper and lower surfaces of the cutting insert are reversed and the upper surface is used as a fastening surface with a cutting tool, the lower surface is used as an inclined surface. This slope can be used. 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.

As shown in FIG. 2 , the upper surface 1 includes an inclined surface 11 and a flat surface (fastening surface) 12 .

The inclined surface 11 is inclined from the cutout 5 toward the fastening hole 4, and the flat surface (fastening surface) 12 surrounds the fastening hole 4 and extends to the inclined surface 11.

The side surface 3 has a main cutting edge 31 and an inner major cutting edge 32, and these clearance surfaces 31 and 32 lead to a minor cutting edge 33. And the side surface 3 is a so-called negative surface that penetrates the center of the side surface 3 in the longitudinal direction (up and down direction in FIG. 5) and forms a perpendicular to the imaginary plane P1 that bisects the cutting insert. can be

Referring to FIG. 2, the cutting portion 5 is sequentially in a direction relatively away from the rotational axis R of the cutting tool, the inner cutting edge 53, the sub cutting edge 52 following the inner peripheral cutting edge 53, and , It includes the main cutting edge 51 following the minor cutting edge 52 and the corner cutting edge 54 following the main cutting edge 51.

In particular, a concave portion 13 is formed on the upper surface 1 of this cutting insert, extending along the major cutting edge 51 across the inclined surface 11 and the flat surface 12.

The width of the concave portion 13 gradually increases as the distance from the rotational axis R of the cutting tool 200 increases.

In this regard, in the major cutting edge 51, the width a of the concave portion 13 at the proximal point 511 closest to the rotational axis R of the cutting tool 200, the rotational axis of the cutting tool 200 ( The width (b) of the concave portion 13 at the distal point 512 farthest from R), the diameter of rotation (Da) of the proximal point 511 centered on the rotation axis R, and the rotation axis R centered The rotational diameter Db of the distal point 512 as , satisfies the following [Equation 1].

[Equation 1] b = Db/Da × a

In addition, as shown in FIG. 3, on the upper surface 1 of this cutting insert, a plurality of grooves 14 separated from each other are further disposed along the main joint 51 across the inclined surface 11 and the concave portion 13. It can be.

Each of these plurality of grooves 14 is characterized in that the length from the main edge 51 toward the flat surface 12 gradually increases as the distance from the rotational axis R of the cutting tool increases.

In addition, each of the plurality of grooves 14 is disposed closer to the main cutting edge 51 as the distance from the rotational axis R of the cutting tool increases.

The concave portion 13 and the plurality of grooves 14 described above bring about chip control and cutting heat reduction effects, respectively. That is, during cutting, the effective cutting speed increases from the sub-cutting edge 52 to the corner cutting edge 54 (direction away from the rotational axis of the cutting tool) of the cutting insert, and the chip stays on the upper surface of the cutting insert. The time is longer, but in this cutting insert, the concave portion 13 whose width is gradually enlarged as it moves away from the rotational axis (R) of the cutting tool, and the length from the main cutting edge 51 in the direction of the flat surface 12 By providing a plurality of grooves 14 that are gradually longer and spaced apart from each other, it is possible to constantly control the discharge direction of chips and efficiently reduce cutting heat.

Meanwhile, referring to FIG. 3 , the cutting insert 100 has three corner portions 6 .

In addition, when viewed from the top surface 1, it is 120°×n (where n is a natural number) rotationally symmetric with respect to the imaginary center line C1 penetrating the center of the fastening hole 4. And as shown in FIG. 5, it is 180 degrees rotationally symmetric with respect to the imaginary center line C2 passing through the center of the side surface 3.

As shown in FIG. 4 , the main joint slope 11 extending along the main joint 51 has a constant width W. And the inclination angle (α) of the inclined surface (11) is constant without fluctuation from the inner edge (53) to the corner edge (54).

Hereinafter, with reference to FIGS. 6 and 7 , 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 lower surface sheet portion 202 on which the lower surface 2 of the cutting insert 100 is seated and a plurality of side surface sheet portions 203 on which some side surfaces 3 of the cutting insert 100 are seated. provide

When the fastening hole 204 to which the fastening bolt 300 is mounted is formed in the seat 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

200 ... cutting tools
100...Cutting inserts
1...top face,
11... inclined surface, 12... flat surface (fastening surface)
13 ... concave portion, 14 ... a plurality of grooves
2... if
3...side, 4...fastening hole
5 ... cutting part
51 ... major clause, 52 ... minor clause
53... Naeju pickled, 54... Corner pickled

Claims (9)

delete delete In the cutting insert mounted on the cutting tool,
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 flat surface extending to the inclined surface surrounding the fastening hole
Including,
The cutting part
Sequentially in a direction relatively away from the rotational axis of the cutting tool, an inner major edge, a sub-edge following the inner major edge, a major edge following the sub-edge, and a corner edge following the main edge
Including,
The upper surface is formed with a concave portion extending along the main joint across the inclined surface and the flat surface,
The concave portion gradually expands in width as it moves away from the axis of rotation of the cutting tool,
In the main joint, the width (a) of the concave portion at the proximal point closest to the rotational axis of the cutting tool, the width (b) of the concave portion at the distal point furthest from the rotational axis of the cutting tool, and the rotation of the proximal point The diameter (Da) and the diameter of rotation (Db) of the distal point are,
[Equation] b = Db/Da × a
A cutting insert characterized in that satisfies. In the cutting insert mounted on the cutting tool,
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 flat surface extending to the inclined surface 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, a main edge following the sub-edge, and a corner edge following the main edge
Including,
The upper surface is formed with a concave portion extending along the main joint across the inclined surface and the flat surface,
The concave portion gradually expands in width as it moves away from the axis of rotation of the cutting tool,
A cutting insert, characterized in that a plurality of grooves separated from each other spanning the inclined surface and the concave portion are disposed along the main cutting edge. In paragraph 4,
The cutting insert, characterized in that the length of each of the plurality of grooves from the main cutting edge toward the flat surface increases as the distance from the rotational axis of the cutting tool increases. In paragraph 5,
The cutting insert, characterized in that each of the plurality of grooves is closer to the main cutting edge as the distance from the rotational axis of the cutting tool. delete In the cutting insert mounted on the cutting tool,
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 flat surface extending to the inclined surface 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, a main edge following the sub-edge, and a corner edge following the main edge
Including,
The upper surface is formed with a concave portion extending along the main joint across the inclined surface and the flat surface,
Among the inclined surfaces, the main edge inclined surface extending along the major edge has a constant width,
The cutting insert, characterized in that the inclination angle of the inclined surface is constant from the inner edge to the corner edge. A cutting tool to which the cutting insert according to any one of claims 3 to 6 and 8 is mounted.

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