KR102284505B1 - Cutting insert - Google Patents

Abstract

The present invention relates to a cutting insert, which is mounted on an insert pocket formed at an end of a cutting tool in a replaceable manner, and can cut a workpiece. The cutting insert of the present invention comprises: an upper surface part formed of three sides formed in a convex curved shape to form a triangular flat surface; a lower surface part formed to have the same shape as that of the upper surface part to be opposite thereto; three side surface parts formed of a convex curved surface to connect any one side of the upper surface part with one side of the lower surface part; a through-hole part formed to penetrate the centers of the upper and lower surface parts; and a cutting part formed at a portion in which the upper and side surface parts intersect each other and a portion in which the lower and side surface parts intersect each other, and the cutting insert is divided into a functional part and a nonfunctional part with respect to a curved part of the side surface parts.

Description

Cutting insert {Cutting insert}

The present invention relates to a cutting insert, and more particularly, to a cutting insert which is replaceably mounted in an insert pocket formed at an end of a cutting tool and capable of cutting a workpiece.

A cutting tool is a tool that is fastened to a general-purpose or dedicated machine tool that performs cutting and is used to cut or cut metal by rotation.

In general, a cutting tool has a cutting insert of a cemented carbide body having a cutting edge on one side by using a clamp screw in an insert pocket formed at the tip of the tool body. Such an exchangeable blade rotary cutting tool is equipped with a plurality of cutting inserts, and it is possible to perform a cutting process on a workpiece such as steel or cast iron.

However, such a conventional cutting insert interferes with the cutting insert by curl (bending phenomenon) of the cutting chip when the cutting chip is generated during cutting, so that the cutting chip is caught between the cutting insert and the workpiece or There was a problem in that cutting efficiency was lowered because the cutting chips were not smoothly discharged. Accordingly, there is a problem in that the quality of the machining surface of the workpiece cut by the cutting insert is lowered, and the life of the cutting insert is also lowered.

The present invention is to solve various problems including the above problems. The cutting insert mounted on the insert pocket of the cutting tool is firmly supported by the insert pocket and the flow of the cutting chips is smoothly induced, thereby discharging the cutting chips. An object of the present invention is to provide a cutting insert capable of performing cutting with high efficiency on a workpiece such as steel or cast iron. However, these problems are exemplary, and the scope of the present invention is not limited thereto.

According to one embodiment of the present invention, a cutting insert is provided. The cutting insert may include: an upper surface portion formed as a flat surface of a triangular shape as a whole including three sides formed in a convex curved shape; a lower surface portion formed to face the same shape as the upper surface portion; three side portions formed of a convex curved surface to connect any one side of the upper surface portion and one side of the lower surface portion; a through-hole portion formed to penetrate the center of the upper surface portion and the lower surface portion; and a cutting portion formed at a portion where the upper surface portion and the side portion intersect, and a portion where the lower surface portion and the side portion intersect, and divided into a functional portion and a non-functional portion based on the curved portion of the side portion. The part may include, as the functional part, a main cutting part formed to extend from the curved part toward any one corner part where the side part intersects; and a round part formed to extend from the curved part toward another corner where the side part intersects, as the non-functional part, wherein the side part is a square along the side part from the vicinity of the curved part toward the one corner part. a first support portion formed of a convex curved surface; a second support portion formed in a convex curved surface of a square shape along the side portion toward the other corner portion from the vicinity of the curved portion; a first rake portion concavely formed from the first support portion in a rectangular shape near the major cut-out portion formed on the upper surface side; and a second rake portion concavely formed from the second support portion in a rectangular shape near the main cut-out portion formed on the lower surface side.

According to an embodiment of the present invention, the cutting part is formed in parallel with the upper surface part and the lower surface part between the upper surface part and the lower surface part and on an imaginary intermediate plane that bisects the side part, the first part of the through hole part With respect to the first central axis and the second central axis formed to pass through the curved portion, the main cut-out portion and the round portion formed on the upper surface side and the main cut-out portion and the round portion formed on the lower surface side may be formed in a 180 degree rotationally symmetrical shape. .

According to an embodiment of the present invention, the side portion, with respect to the second central axis, the first support portion and the first rake portion and the second support portion and the second rake portion is formed in a 180 degree rotationally symmetrical shape. can be

According to an embodiment of the present invention, the first support portion is formed to form an acute angle with the upper surface portion and to form an obtuse angle with the lower surface portion, and the second support portion forms an acute angle with the lower surface portion, and the upper surface portion and may be formed to form an obtuse angle.

According to an embodiment of the present invention, a first clearance wiper formed to protrude from the first support portion in a rectangular shape at the one corner portion side end of the first support portion; and a second clearance wiper formed to protrude from the second support part in a square shape at the end of the second support part on the other corner part side.

According to an embodiment of the present invention, the first rake wiper is formed to be inclined toward the second rake portion formed on the other side adjacent to the end of the first clearance wiper; and a second rake wiper inclined toward the first rake part formed on the other side adjacent to the end of the second clearance wiper.

According to an embodiment of the present invention, the first support portion and the first rake portion may be formed in a trapezoidal shape as a whole in a front view with the side surface facing each other so that sides facing each other are inclined.

According to an embodiment of the present invention, the first rake portion, a first inclined surface formed to be inclined toward the first support portion; and a second inclined surface inclined toward the main cutting edge in a direction opposite to the first inclined surface.

According to an embodiment of the present invention, on the first rake part, a plurality of are formed to protrude in a circular dome shape having a flat upper surface, and a plurality of them are arranged in a line along a tangent line where the first inclined surface and the second inclined surface meet It may further include a crushing protrusion.

According to an embodiment of the present invention, on the first support, the support protrusion is formed to protrude in the shape of a square pillar having a flat upper surface, and a plurality of support protrusions are arranged in a square shape; may further include.

According to an embodiment of the present invention made as described above, it is possible to increase the support force for the cutting insert mounted in the insert pocket of the cutting tool. In addition, by forming the shape of the side portion to improve the discharge flow of the cutting chips, the flow of the cutting chips generated during cutting is smoothly induced, thereby improving the dischargeability of the cutting chips.

Accordingly, it is possible to implement a cutting insert that can perform cutting with high efficiency on a workpiece such as steel or cast iron while improving the life of the cutting insert and the quality of the machining surface of the workpiece cut by the cutting insert. Of course, the scope of the present invention is not limited by these effects.

1 is a perspective view schematically showing a cutting insert according to an embodiment of the present invention.
2 and 3 are cross-sectional views respectively showing a plane and a front surface of the cutting insert of FIG. 1 .
FIG. 4 is a cross-sectional view showing a cross section of the cutting insert taken along the cut line IV-IV of FIG. 2 .
5 is a perspective view schematically showing a cutting insert according to another embodiment of the present invention.
6 is a cross-sectional view showing the front of the cutting insert of FIG.
7 is a perspective view schematically showing a cutting insert according to another embodiment of the present invention.
8 is a cross-sectional view showing the front of the cutting insert of FIG.

Hereinafter, several preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Examples of the present invention are provided to more completely explain the present invention to those of ordinary skill in the art, and the following examples may be modified in various other forms, and the scope of the present invention is as follows It is not limited to an Example. Rather, these embodiments are provided so as to more fully and complete the present disclosure, and to fully convey the spirit of the present invention to those skilled in the art. In addition, in the drawings, the thickness or size of each layer is exaggerated for convenience and clarity of description.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings schematically illustrating ideal embodiments of the present invention. In the drawings, variations of the illustrated shape can be expected, for example depending on manufacturing technology and/or tolerances. Accordingly, embodiments of the spirit of the present invention should not be construed as limited to the specific shape of the region shown in the present specification, but should include, for example, changes in shape caused by manufacturing.

1 is a perspective view schematically showing a cutting insert 100 according to an embodiment of the present invention, FIGS. 2 and 3 are cross-sectional views respectively showing a plane and a front surface of the cutting insert 100 of FIG. 1 , FIG. 4 is It is a cut sectional view showing the cross section of the cutting insert 100 taken along the perforation line IV-IV of FIG.

First, as shown in Figure 1, the cutting insert 100 according to an embodiment of the present invention, largely, the upper surface portion 10, the lower surface portion 20, the side portion 30, and the through-hole portion ( 40) and a cutting part 50 may be included.

As shown in Figure 1, the cutting insert 100, the upper surface portion 10, the lower surface portion 20 and the upper surface portion 10 and the lower surface portion 20 so as to be formed in a triangular prism shape as a whole. It may be formed of three side parts (30a, 30b, 30c) that connect.

More specifically, the upper surface portion 10 of the cutting insert 100 may be formed as a flat surface of a triangular shape as a whole by having three sides formed in a convex curved shape. In addition, the lower surface portion 20 is made of three sides formed in the same convex curved shape as the upper surface portion 10 is formed in a triangular flat surface as a whole, and is spaced apart from the upper surface portion 10 by a predetermined distance. and may be formed opposite to each other.

In addition, the side portion 30 may be formed as a convex curved surface so as to connect one side of the upper surface portion 10 and one side of the lower surface portion 20 opposite thereto. For example, the side portion 30 may be formed of three side portions 30a, 30b, and 30c to connect all sides of the upper surface portion 10 and the lower surface portion 20, which are formed in a triangular shape as a whole.

At this time, the through-hole portion 40 is formed to penetrate the central portions of the upper surface portion 10 and the lower surface portion 20, so that when the cutting insert 100 is fastened to the insert pocket of the cutting tool, the function of a clamping hole can be performed.

As shown in FIGS. 1 to 3 , the cutting part 50 is to be formed in a part where the upper surface part 10 and the side part 30 intersect and the lower surface part 20 and the side part 30 intersect. can In this case, the cutting part 50 may be divided into a functional part and a non-functional part based on the curved part B of the side part 30 formed as a convex curved surface.

More specifically, the cutting part 50 is the functional part, and the main cutting part 51 and the non-functional part are formed to extend from the curved part B toward any one corner part C1 where the side part 30 intersects. As a part, it may include a round part 52 formed to extend from the curved part B toward the other corner part C2 where the side part 30 intersects.

In addition, the cutting part 50 is formed in parallel with the upper surface part 10 and the lower surface part 20 between the upper surface part 10 and the lower surface part 20 to bisect the side part 30 in an imaginary intermediate plane ( On M), the main cut-out portion 51 formed on the upper surface portion 10 side with respect to the second central axis A2 formed to pass through the first central axis A1 of the through-hole portion 40 and the curved portion B. And the round portion 52 and the lower surface portion 20 formed on the side of the main cut-out portion 51 and the round portion 52 may be formed in a 180-degree rotationally symmetrical shape.

Accordingly, the upper surface portion 10 of the cutting insert 100 may be seated in the insert pocket of the cutting tool and used, or the cutting portion 50 in the same shape may be used so that the lower surface portion 20 is seated in reverse. can be exposed. In addition, a portion of the cutting part 50 that does not perform a cutting function is treated as a round part 52 as the non-functional part, thereby reducing the sharp blade part of an unnecessary part to reduce the possibility of injury to the operator, and the cutting insert 100 can also increase the overall strength of

1 to 3, the side portion 30 is formed as a convex curved surface of a quadrangular shape along the side portion 30 from the vicinity of the curved portion B toward any one corner portion C1. The support part 31 and the second support part 32 formed in the convex curved surface of a square shape along the side part 30 toward the other corner part C2 from the vicinity of the curved part B, and the upper surface part 10 side The first rake part 33 formed concavely from the first support part 31 in a square shape near the formed main cut-out part 51 and the second support part in a square shape near the main cut-out part 51 formed on the lower surface side 20 It may include a second rake portion 34 concavely formed from (32).

At this time, even if the upper surface portion 10 of the cutting insert 100 is seated in the insert pocket of the cutting tool or the lower surface portion 20 is seated by turning the cutting insert 100 over, the side portion 30 can be formed in the same shape, As for the side part 30, the first support part 31 and the first rake part 33 and the second support part 32 and the second rake part 34 rotate 180 degrees with respect to the second central axis A2. It may be formed in a symmetrical shape.

In addition, as shown in FIG. 3 , the first support part 31 and the first rake part 33 on the front view with the side part 30 as the front side are formed in a trapezoidal shape as a whole and face each other (S) It may be formed to be inclined.

At this time, the first rake part 33 is a first inclined surface 33a formed to be inclined toward the first support part 31 and a first inclined surface 33a formed to be inclined toward the main cutting part 51 in the opposite direction to the first inclined surface 33a. It may include two inclined surfaces (33b).

More specifically, the first rake part 33 is formed in a trapezoidal shape as a whole in which the side S facing the first support part 31 is inclined, and a first inclined surface 33a in contact with the first support part 31 is formed. ) Also, by being inclined along the opposite side (S), the tangent (T) where the first inclined surface (33a) and the second inclined surface (33b) meet is also the main cutting part ( 51) and may be inclined in a direction away from it.

Therefore, the first rake portion 33 has a concave valley shape having a V-shaped cross section in the side portion 30 by the first inclined surface 33a and the second inclined surface 33b inclined in opposite directions to each other. It is formed so that the cutting chips generated by cutting the workpiece by the main cutting part 51 can be guided to smoothly escape along the valley shape of the first rake 33 . At this time, the valley shape of the first rake 33 is formed to be inclined in a direction away from the main cutting part 51 as it goes from the curved part B to the corner part C1 direction, so that the cutting chips are more inclined to the outside of the cutting insert 100 . A flow of cutting chips can be induced for rapid ejection.

In addition, the second rake portion 34 formed on the side of the second support portion 32 may also be formed to have a first inclined surface 34a and a second inclined surface 34b in the same configuration as the first rake portion 33 . . Therefore, detailed description is omitted.

In addition, the first support part 31 of the side part 30 may be formed to be slightly inclined rather than perpendicular to the upper surface part 10 and the lower surface part 20 . For example, as shown in FIG. 4 , the first support part 31 may be formed to form an acute angle a1 with the upper surface part 10 and an obtuse angle a2 with the lower surface part 20 . At this time, although not shown, the second support part 32 is formed in a rotationally symmetrical shape with respect to the first support part 31 and the second central axis A2, and thus forms an acute angle with the lower surface part 20, the upper surface It is formed to form an obtuse angle with the portion 10 , and may be formed to be inclined in a direction opposite to that of the first support portion 31 .

Accordingly, the first support part 31 and the second support part 32 seated in the insert pocket of the cutting tool to support the cutting insert 100 are not formed perpendicular to the upper surface part 10 and the lower surface part 20 and are fine The cutting insert 100 mounted on the cutting tool may support the cutting insert 100 to be inclined at a predetermined angle with respect to the cutting force generated when cutting the workpiece.

Therefore, since the cutting insert 100 is firmly supported by the cutting tool, the rigidity of the cutting insert 100 may be strengthened, and it may have an effect of preventing vibration of the cutting insert 100 during cutting.

In addition, as shown in Figures 1 to 3, the cutting insert 100 according to an embodiment of the present invention, any one corner portion (C1) side of the first support portion 31 of any one side portion 30a A first clearance wiper 35 formed to protrude in a rectangular shape from the end and a second rake portion 34 formed on the other side portion 30c adjacent to the end of the first clearance wiper 35. A first rake formed to be inclined The wiper 37 and the second clearance wiper 36 and the second clearance wiper 36 formed to protrude from the second support part 32 in a rectangular shape at the end of the second support part 32 at the other corner part C2 side. ) may further include a second rake wiper 38 which is inclined toward the first rake portion 33 formed on the other side portion 30b adjacent to the end of the rake.

For example, the first clearance wiper 35 and the first rake wiper 37, and the second clearance wiper 36 and the second rake wiper 38 in either side portion 30a have a second central axis A2. It may be formed to be 180 degrees rotationally symmetrical with respect to . Accordingly, the clearance wipers 35 and 36 and the rake wipers 37 and 38 formed in a direction perpendicular to each other may be formed in each of the corner portions C1, C2, and C3.

These, the first clearance wiper 35 and the first rake wiper 37 are formed to be connected to the main cut-out portion 51 formed in the other adjacent side part 30c, and the second clearance wiper 36 and the second rake wiper ( 38 ) is formed to be connected to the main cutting part 51 formed on the other adjacent side part 30b , and thus may have the effect of improving the machining surface roughness when cutting the workpiece of the cutting insert 100 .

Accordingly, the cutting insert 100 according to an embodiment of the present invention may increase the support force for the cutting insert 100 mounted in the insert pocket of the cutting tool. In addition, by forming the shape of the side portion 30 to improve the discharge flow of the cutting chips, the flow of the cutting chips generated during cutting is smoothly induced, thereby improving the discharge of the cutting chips. In addition, by optimizing the shape of the main cutting part 51 of the cutting part 50 and forming a wiper with a shape following it, cutting can be performed while improving the quality of the machining surface of the workpiece cut by the cutting insert. .

5 is a perspective view schematically showing a cutting insert 200 according to another embodiment of the present invention, and FIG. 6 is a cross-sectional view showing a front side of the cutting insert 200 of FIG. 5 .

5 and 6, the cutting insert 200 according to another embodiment of the present invention is formed to protrude in a circular dome shape having a flat upper surface on the first rake part 33, and the second It may include a plurality of crushing protrusions 60 arranged in a line along the tangent (T) where the first inclined surface (33a) and the second inclined surface (33b) meet.

More specifically, the crushing protrusion 60, along the tangent (T) of the first rake portion 33, the first protrusion 61, the second protrusion 62, the third protrusion 63 and the fourth protrusion 64 may be arranged in a line, and may also be formed in the second rake portion 34 in a 180-degree rotationally symmetrical shape with respect to the second central axis A2.

At this time, the crushing protrusion 60, four protrusions of the same size are exemplified as being arranged in a line, but is not necessarily limited thereto, and protrusions of different sizes may be arranged in various numbers. The size and number of these crushing protrusions 60 may be selectively applied by a designer according to a field to which the cutting insert 200 is applied. In addition, the crushing protrusion 60 may have a flat upper surface, and may serve to support the cutting insert 200 together with the respective supports 31 and 32 in the insert pocket of the cutting tool.

Therefore, in the cutting insert 200 according to another embodiment of the present invention, along the tangent (T) of the first rake portion 33, a plurality of crushing projections 60 are arranged in a line, the first rake portion ( By crushing the cutting chips discharged along 33), it is possible to induce the cutting chips to be discharged from the cutting insert 200 more easily.

7 is a perspective view schematically showing a cutting insert 300 according to another embodiment of the present invention, and FIG. 8 is a cross-sectional view showing a front side of the cutting insert 300 of FIG. 7 .

7 and 8, the cutting insert 300 according to another embodiment of the present invention is formed to protrude in the shape of a square column having a flat upper surface on the first support part 31, and a plurality of squares It may further include a support protrusion 70 arranged in a shape.

More specifically, in the support protrusion 70 , in the region of the first support part 31 , the first protrusion 71 , the second protrusion 72 , the third protrusion 73 and the fourth protrusion 74 are square. can be arranged in a shape. At this time, the third protrusion 73 and the fourth protrusion 74 formed in the portion adjacent to the first rake part 33 have the side S where the first support part 31 and the first rake part 33 face each other (S). ) may be formed in a trapezoidal shape with one side inclined along the line. In addition, the support protrusion 70 may also be formed in the second support part 32 in a shape that is rotationally symmetrical by 180 degrees with respect to the second central axis A2 . In addition, although the support protrusion 70 is provided with four square protrusions as an example, it is not necessarily limited thereto, and protrusions of different sizes and shapes may be disposed in various forms.

Therefore, in the cutting insert 300 according to another embodiment of the present invention, a plurality of support protrusions 70 having a flat upper surface are formed on the first support part 31 and the second support part 32 to be cut, In the insert pocket of the tool, each support part 31 , 32 may be guided to more firmly support the cutting insert 300 .

Although the present invention has been described with reference to the embodiment shown in the drawings, which is merely exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

10: upper surface
20: lower part
30: side part
31: first support part
32: second support part
33: first rake portion
34: second rake part
35: first clearance wiper
36: second clearance wiper
37: first rake wiper
38: second rake wiper
40: through hole part
50: cutting part
51: week-end worker
52: round part
60: crushing projection
70: support protrusion
A1: first central axis
A2: second central axis
B: bend
C1, C2, C3: Corner
M: mid plane
100, 200, 300: cutting inserts

Claims (10)

an upper surface portion composed of three sides formed in a convex curved shape and formed as a flat surface of a triangular shape as a whole;
a lower surface portion formed to face the same shape as the upper surface portion;
three side portions formed of a convex curved surface to connect any one side of the upper surface portion and one side of the lower surface portion;
a through-hole portion formed to penetrate the center of the upper surface portion and the lower surface portion; and
a cutting part formed in a portion where the upper surface part and the side surface part cross and a part where the lower surface part and the side part cross each other, and divided into a functional part and a non-functional part based on the curved part of the side part;
The cutting part,
as the functional part, a main cutting part formed to extend from the curved part toward any one corner part where the side part intersects; and
As the non-functional part, a round part formed to extend from the curved part toward another corner part where the side part intersects; includes;
The side part,
a first support portion formed in a convex curved surface of a square shape along the side portion toward the one corner portion from the vicinity of the curved portion;
a second support portion formed in a convex curved surface of a rectangular shape along the side portion from the vicinity of the curved portion toward the other corner portion;
a first rake portion concavely formed from the first support portion in a rectangular shape near the main cut-out portion formed on the upper surface side; and
a second rake portion concavely formed from the second support portion in a rectangular shape near the main cutting portion formed on the lower surface side;
The first support part,
Forming an acute angle with the upper surface portion, is formed to form an obtuse angle with the lower surface portion,
The second support part,
Forming an acute angle with the lower surface portion, the cutting insert is formed to form an obtuse angle with the upper surface portion. The method of claim 1,
The cutting part,
A second formed to pass through the first central axis and the curved portion of the through-hole portion on an imaginary intermediate plane formed between the upper surface portion and the lower surface portion in parallel with the upper surface portion and the lower surface portion to bisect the side portion With respect to the central axis, the main cut-out portion and the round portion formed on the upper surface side and the main cut-out portion and the round portion formed on the lower surface side are formed in a 180 degree rotationally symmetrical shape, a cutting insert. 3. The method of claim 2,
The side part,
With respect to the second central axis, the first support portion and the first rake portion and the second support portion and the second rake portion are formed in a 180 degree rotationally symmetrical shape, a cutting insert. delete The method of claim 1,
a first clearance wiper formed to protrude from the first support part in a rectangular shape at the one corner side end of the first support part; and
a second clearance wiper formed to protrude from the second support part in a rectangular shape at an end of the second support part on the side of the other corner part;
Further comprising, a cutting insert. 6. The method of claim 5,
a first rake wiper inclined from an end of the first clearance wiper toward a second rake portion formed on the other side adjacent thereto; and
a second rake wiper inclined toward the first rake portion formed on the other side adjacent to the end of the second clearance wiper;
Further comprising, a cutting insert. The method of claim 1,
The first support part and the first rake part in a front view with the side part in front,
A cutting insert that is formed in a trapezoidal shape as a whole so that the sides facing each other are inclined. 8. The method of claim 7,
The first rake unit,
a first inclined surface inclined toward the first support; and
a second inclined surface inclined toward the main cutting edge in a direction opposite to the first inclined surface;
Containing, a cutting insert. 9. The method of claim 8,
a crushing protrusion formed to protrude in a circular dome shape having a flat upper surface on the first rake part, and a plurality of crushing projections arranged in a line along a tangent line where the first inclined surface and the second inclined surface meet;
Further comprising, a cutting insert. The method of claim 1,
a support protrusion formed to protrude in the shape of a square column having a flat upper surface on the first support part, and a plurality of support protrusions are arranged in a square shape;
Further comprising, a cutting insert.

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