KR102011329B1 - Cutting insert and cutting tool mounted with the same - Google Patents

Abstract

An object of the present invention is to provide a cutting insert which can increase the fastening property with a cutting tool and also increase the number of available cutting edges.
To this end, the cutting insert according to an embodiment of the present invention comprises a sloping pickle, a snip that extends to the sloping pickle, a corner cut that extends to the snip, and a main cut to extend to the corner pickle. Comprising one surface, the fastening hole is provided on the marginal surface is a major section, three first surfaces are formed at equal intervals around an imaginary center line passing through the center of the fastening hole, one end of the first surface A subsurface free surface extending from the subcutaneous is provided, and a triangular prism-shaped protrusion is formed on the lower surface of the cutting insert in a direction opposite to the clearance surface portion.

Description

Cutting insert and cutting tool mounted with the same}

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

Generally, cutting inserts are used to cut a workpiece composed of ferrous, nonferrous metals, nonmetallic materials, etc., fastened to a cutting tool mounted on a machine tool.

The cutting insert has a double-sided cutting insert that can be used for both the upper side and the lower side in the shape of each side connecting the upper surface and the lower surface is rotated symmetrically 180 degrees around the center and the upper side pickling Only one-sided cutting inserts using only.

Cutting inserts disclosed in Korean Patent Laid-Open Publication No. 2015-0020286 in the prior art, as shown in FIGS. 11 and 12, are opposed inserts connected by insert peripheral surfaces 36. Top and base surfaces 32, 34, at least one cutting edge 38, and an insert slip prevention arrangement 40 formed adjacent the insert base surface 34. And the insert slip prevention arrangement 40 has a first and second insert contact surfaces 42A, 42B, and an insert actuator surface 44 that is blunt and oriented to traverse the insert base surface 34. It includes.

For reference, the reference numerals described in the background art are used as they are used in the patent document for convenience of description, and do not refer to the same components even if the reference numerals used in the detailed description of the present invention to be described later (the same) .

However, the above-described conventional cutting insert has a parallelogram shape, a fastening hole is formed in the upper surface 32, and the base surface 34 corresponds to a parallelogram shape of the cutting insert in correspondence with the parallelogram shape of the cutting insert (that is, There is a problem that the insert slip prevention arrangement 40 is formed and the number of cutting edges that can be used is reduced to two, which results in poor utility.

Meanwhile, as another conventional technique, a cutting insert is disclosed in Korean Patent Laid-Open Publication No. 2004-0045830, as shown in FIG. 13, which has a cylindrical protrusion 82, and thus a cutting tool. There is a problem that the fastness is not stable because the sliding can easily occur when fastening with.

Korean Laid-Open Patent Publication No. 2015-0020286 (Published: February 25, 2015) Korean Laid-Open Patent Publication No. 2004-0045830 (Published: June 02, 2004)

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a cutting insert capable of increasing fastening with a cutting tool and increasing the number of available cutting edges.

To this end, the cutting insert according to an embodiment of the present invention is a cutting insert mounted to a cutting tool, and includes an upper surface, a lower surface, and a first surface connecting the upper surface and the lower surface to each other, wherein the first surface is And an inclined pickle extending to the inclined pickling, a corner pickling extending to the inclined pickling, and a main pickling extending to the corner pickling, wherein the upper surface corresponds to a free cutting surface. It is provided on the main cutting edge surface, three first surfaces are formed at equal intervals around the virtual center line passing through the center of the fastening hole, and one end of the first surface extending from the minor Is provided with a surface, the lower surface of the cutting insert is formed with a triangular prism-shaped protrusion in the direction opposite to the main cutting margin, the fastening hole penetrates the main cutting margin and the projection, On the plan view of the cutting insert overlooking the protrusion, the virtual extension line of the edge of the protrusion and the corresponding virtual extension line of the edge of the recessed free surface are not parallel to each other, and on the top view of the first surface, the One end of the first surface is further provided with an inclined section that extends from the inclined pickle, a corner cutting margin surface extending from the corner pick-in, the other end of the first surface is an inclined section that extends from the sub-pickled, It is characterized in that the inclined pickling surface extending from the inclined pickle, the inclined pickling surface extending from the corner pickling is provided respectively.

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In addition, the angle between the virtual extension line of the corner of the protrusion and the virtual extension line of the corner of the marginal margin is preferably greater than 0 ° and less than 20 °.

In addition, three main clearances are formed on the marginal free surface, each of which is adjacent to the major section, at equal intervals around the virtual center line, and a second marginal surface is formed flat around the fastening hole. The first clearance surface is formed to be inclined downward in a direction away from the fastening hole.

In addition, the width of the first clearance surface may be gradually reduced toward the direction away from the corner cutting.

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As a cutting tool to which a cutting insert as described above is mounted, the cutting tool is in contact with side and bottom surfaces of the protrusion of the cutting insert, and has a recess having a triangular prism shape corresponding to the protrusion.

According to the present invention having the above-described configuration, the following effects can be obtained.

By forming the virtual extension line of the edge of the protrusion part and the virtual extension line of the marginal marginal edge at a predetermined angle so as not to be parallel to each other, securing the flesh thickness of the sheet part of the cutting tool (holder) to reduce the rigidity of the sheet part of the cutting tool You can prevent it.

In addition, the cutting insert of the present invention can increase the number of available cutting edges to three, whereas the conventional parallelogram, rectangular cutting inserts with protrusions can utilize two cutting edges (so-called corners). Economics can be increased by increasing the number of corners that can be used with one cutting insert.

1 is a perspective view of a cutting insert according to an embodiment of the present invention as viewed from a main cutting edge.
FIG. 2 is a plan view of the cutting insert of FIG. 1 viewed from a first surface. FIG.
3 is a perspective view of the cutting insert of FIG.
4 is a plan view of the cutting insert of FIG. 1 looking down toward the protrusion;
FIG. 5 shows a coupling relationship between the cutting insert and the cutting tool (holder) of FIG. 1.
FIG. 6 is an enlarged view of the seat portion of the cutting tool shown in FIG. 5.
FIG. 7 shows a case in which a recess is formed in the cutting tool when the angle α of the cutting insert is 0 °.
FIG. 8 shows a case in which a recess is formed in the cutting tool when the angle α of the cutting insert is 5 °.
FIG. 9 shows a case in which a recess is formed in the cutting tool when the angle α of the cutting insert is 25 °.
10 shows a cutaway view in the PP direction of the cutting insert of FIG. 1.
11 to 13 show a conventional cutting insert.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is a perspective view of the cutting insert according to an embodiment of the present invention as viewed from the main cutting edge, FIG. 2 is a plan view of the cutting insert of FIG. 1 viewed from a first surface, and FIG. 3 is a cutting insert of FIG. 4 is a perspective view of the cutting insert of FIG. 1 looking downward in the direction of the projection, respectively.

As shown in Figs. 1 to 3, the cutting insert according to the embodiment of the present invention is an inclined cutout (1), a subcutaneous extender (2) extending to the inclined cutout (1), and a subcutaneous cutout (2). And a first face (5) having a corner cut (3) extending in the and a main cut (4) extending in the corner cut (3). For reference, reference numeral 54 denotes the inclined plane of the inclined pickle (1), reference numeral 55 denotes the inclined plane of the inferior pickle (2), reference numeral 56 denotes the inclined plane of the corner pickle (3), and reference numeral 57 denotes the main pickle (4). Are inclined surfaces, respectively.

The cutting insert of the present invention is formed in a so-called tangential type provided in the free surface 7 in which the fastening hole 9 is a major cut.

As shown in FIGS. 1 and 4, three first surfaces 5 are formed at equal intervals (120 ° intervals) about an imaginary center line A passing through the center of the fastening hole 9. Therefore, the cutting insert of the present invention has a substantially triangular shape, which allows three cutting edges (corner number) to be utilized together with the triangular prism shape described later.

On the other hand, as shown in FIG. 3, one end of the first surface 5 is provided with a subcutaneous free surface 52 extending from the subcutaneous 2. For reference, reference numeral 51 denotes a marginal surface of the inclined joint 1, and reference numeral 53 denotes a marginal surface of the corner joint 3, respectively.

The lower surface 6 of the cutting insert is provided with a triangular prism-shaped projection 8 in the direction opposite to the free surface 7, which is a major cut. On the other hand, as shown in Figure 4, the vertex portion of these triangular prism is rounded to prevent stress concentration. The protrusion 8 has a fastening surface 81 and a fastening side surface 82 which are fastened to the cutting tool (holder).

On the plan view (FIG. 4) of the cutting insert looking down at the projection 8, the virtual extension of the edge C of the edge 83 of the projection 8 and the corresponding edge 521 of the marginal surface 52 which is correspondingly subcutaneous. The extension lines B are not parallel to each other and form a predetermined angle. Here, the angle α between the virtual extension line C of the protruding edge 83 and the virtual extension line B of the marginal margin surface 521 is preferably greater than 0 ° and smaller than 20 °.

5 shows a cutting tool (holder) on which a cutting insert according to the invention is mounted.

The cutting tool has a seat portion 10 on which a cutting insert is mounted, and the seat portion 10 is formed with a concave portion 100 having a triangular prism shape corresponding to the protrusion 8 of the cutting insert.

As shown in FIG. 6, the recess 100 has a recess side face 102 and a recess bottom face 101 in contact with the side face 82 and the bottom face 81 of the protrusion 8 of the cutting insert, respectively. do. In addition, a fastening hole to which the fastening means (screw) S is fastened is formed in the concave bottom surface 101.

As described above, in the present invention, the angle α formed between the virtual extension line C of the protrusion edge 83 and the virtual extension line B of the recessed free edge 521 is not parallel to each other, preferably By forming an angle larger than 0 ° and smaller than 20 °, the rigidity of the cutting tool sheet 10 can be prevented, and a good fastening force between the cutting tool and the cutting insert can also be ensured.

In this regard, FIGS. 7 and 8 show that when the angle α of the cutting insert is 0 ° and 5 °, respectively, the recess 100 is formed in the cutting tool correspondingly. In the case where the angle α of the cutting insert is 25 °, the recess 100 is formed in the cutting tool correspondingly.

As can be seen from this, in the cutting insert, when the virtual extension line C of the protrusion edge 83 and the virtual extension line B of the recessed free edge 521 are parallel to each other (FIG. 7), that is, the angle ( In contrast to the case where α) is 0 °, as in the cutting insert of the present invention, the virtual extension line C of the protrusion edge 83 and the virtual extension line B of the recessed free edge 521 are not parallel to each other. For example, when angle (alpha) is 5 degrees, the thickness of the sheet | seat 10 can be secured relatively large, and the fall of rigidity of the sheet | seat part 10 of a cutting tool can be prevented. In addition, as can be seen in FIG. 9, when the angle α is 25 °, the lower left vertex portion of the recess 100 penetrates the surface of the cutting tool that contacts the lower surface 6 of the cutting insert. On the contrary, there is a concern that the sheet part rigidity is lowered, and the inventors of the present invention dig the surface of the cutting tool in which the lower left vertex portion of the recess 100 contacts the lower surface of the cutting insert when the angle α is 20 °. It was confirmed that the threshold value to ensure the maximum thickness of the sheet portion 10 without. Therefore, in the present invention, the angle α between the virtual extension line C of the protrusion edge 83 and the virtual extension line B of the recessed clearance edge 521 is not parallel to each other. Also, it is preferable that the angle α forms an angle larger than 0 ° and smaller than 20 °.

In addition, by forming the angle formed by the virtual extension line (C) of the protrusion edge 83 and the virtual extension line (B) of the recessed free surface edge 521 as described above, forming the protrusion 8 of the cutting insert Since the sum of the lengths of the three edges 83 can be secured sufficiently long, the fastening side surface 82 in contact with the concave side surface 102 of the cutting tool can be secured widely when fastening with the cutting tool. As a result, an excellent fastening force can be achieved.

On the other hand, as shown in Figure 1, the main cutting edge 7 is formed with three first clearance surfaces 71 adjacent to the main cutting edge 4 at equal intervals around the virtual center line A, respectively. The second clearance 72 is formed flat around the fastening hole 9.

Here, the first clearance surface 71 is formed such that its width gradually decreases toward the direction away from the corner cut (3). The reason is that when the helix is applied to the main cutting 4 of the present invention, the clearance angle of the end of the main cutting 4, which is farthest from the corner cutting 3, is required during the high cutting process. Therefore, if you put the reversely positive (reversely positive) shape, the clearance angle at the end of the main cutting (4) during the machining may be insufficient, so that the clearance surface width is narrowed as in the present invention, it is possible to secure more margin during machining .

As shown in FIG. 10, the first clearance surface 71 is formed to be inclined downward in a direction away from the fastening hole 9. In this way, when a chip is pulled away from the workpiece during the cutting process, the head of the screw used for fastening with the cutting tool collides with the chip by flowing upward upward through the first clearance surface 71. Can be effectively prevented from being damaged.

In addition, the cutting insert of the present invention has a substantially triangular shape, and one end 11 of the first surface 5 extends from the inclined section free surface 51 and the subtracted section 2 extending from the inclined section 1. Subcutaneous free surface 52, the corner cutting free surface 53 extending from the corner pickling (3) is provided, the other end 12 of the first surface (5) is a subcutaneous inclined surface extending from the subcutaneous (2) (55), the number of available corners can be increased to three through a configuration in which the inclined pickling inclined surface 54 extending from the inclined pickling 1 and the corner pickling inclined surface 56 extending from the corner picking 3 are respectively provided. Can increase the economic efficiency,

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 concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1: sloping
3: corner temple 4: week temple
5: side 1 51: sloped margin
52: marinated free noodles 53: corner marinated free noodles
6: Lower surface of cutting insert 7: Main cutting edge
8: protrusion
81: When fastening 82: Fastening side
9: fastening hole 10: seat part of cutting tool
100: recess 101: recess
102: concave side

Claims (7)

Cutting inserts mounted on cutting tools,
An upper surface, a lower surface, and a first surface connecting the upper surface and the lower surface to each other;
The first surface includes an inclined pickle, a submerge extending to the inclined pickle, a corner cutout extending to the subcutaneous, and a main cutout extending to the corner pickle,
The upper surface corresponds to the free yomyeon,
The fastening hole is provided in the marginal surface which is the main cutting,
Three first surfaces are formed at equal intervals around the virtual center line passing through the center of the fastening hole,
One end of the first surface is provided with a subsurface margin that extends from the sub-article,
The lower surface of the cutting insert is formed with a triangular prism-shaped protrusion in the direction opposite to the main cutting margin,
The fastening hole penetrates through the main free surface and the protruding portion,
On the plan view of the cutting insert overlooking the protrusion, the virtual extension line of the edge of the protrusion and the corresponding virtual extension line of the edge of the recessed free surface are not parallel to each other,
On the top view looking down the first side,
One end of the first surface is further provided with an inclined section extending surface from the inclined pickle, the corner cutting margin surface extending from the corner cut,
The other end of the first surface is provided with an inclined inclined surface extending from the inclined inclined, inclined inclined inclined surface extending from the inclined inclined, and a corner inclined inclined surface extending from the corner inclined respectively
Cutting inserts. delete In claim 1,
Cutting angle of the virtual extension line of the edge of the protrusion and the virtual extension line of the edge of the marginal margin surface is greater than 0 ° and less than 20 ° cutting insert. In claim 1,
Three main clearances, each of which is adjacent to the main temple, are formed at equal intervals around the virtual center line, and a second clearance is formed flat around the fastening hole.
The first insert is a cutting insert is formed to be inclined downward in the direction away from the fastening hole. In claim 4,
The first insert has a cutting insert that is gradually reduced in width toward the direction away from the corner cutting. delete A cutting tool, to which the cutting insert according to any one of claims 1 and 3 to 5 is mounted,
And a concave portion contacting the side and bottom surfaces of the protrusion of the cutting insert and having a triangular prism shape corresponding to the protrusion.

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