KR20200131466A - Wheel type diamond tools - Google Patents

Abstract

The present invention relates to a disc diamond tool. According to the present invention, as the left side surface of a segment extends toward the outer circumference of a shank further than the right side surface thereof, a lower surface being in contact with the outer circumference of the shank is formed to be inclined to approach the central axis of the shank as the same goes to the left end from the right end so as to prevent a under-cut phenomenon from occurring by preventing a junction part between the shank and the segment from being worn even though chip powder, scraps and the like are discharged during a cutting process, thereby preventing the segment from being fallen from the shank part and improving the durability thereof.

Description

Disc-shaped diamond tools {WHEEL TYPE DIAMOND TOOLS}

The present invention relates to a disk-shaped diamond tool in which slots are formed between segments, and specifically, prevents undercut from occurring due to abrasion due to chip powder or chipped chips at the junction between the segment and the shank. Thus, it relates to a disk-shaped diamond tool capable of preventing the segment from falling off from the shank.

In general, a diamond tool is a tool that cuts or polishes the surface of a workpiece (workpiece) using natural diamond or artificial diamond, and it is a diamond tool that has excellent hardness and wear and a low coefficient of thermal expansion. I'm using it.

1 is a plan view illustrating a general disk (wheel) type diamond tool.

Referring to FIG. 1, the disk-shaped diamond tool 10 according to the prior art is formed in the shape of a disk (wheel) and is formed on the outer periphery of the shank 11 and the shank 11 to be coupled to a power tool (not shown). It includes a plurality of segments (tips) 12 for cutting or polishing the workpiece.

FIG. 2 is a cross-sectional view illustrating an enlarged connection portion of the shank and the segment shown in FIG. 1.

As shown in FIG. 2, the segment 12 is manufactured by putting diamond abrasive grains in a mold of a predetermined shape in a state in which diamond abrasive grains are mixed with a paste-type binder as a main material, and applying a predetermined pressure with heat.

A plurality of slots 13 are formed in the segment 12 so as to discharge chip powder or scraps generated in the process of cutting a workpiece, that is, a workpiece. Accordingly, the segment 12 is dividedly formed along the outer peripheral surface of the shank 11 by the slot 13.

This segment 12 is formed thicker than the thickness of the shank 11 in order to minimize friction between the workpiece, that is, the workpiece and the shank 11, and to facilitate the discharging of chips or heat, the segment 12 and the shank Steps are generated in the joining portion 13 joining (11).

FIG. 3 is a diagram illustrating a process in which an undercut occurs at a junction between a segment and a shank due to a step generated at a junction between a segment and a shank shown in FIG. 2.

As shown in FIG. 3, an under-cut in which the joint 13 between the segment 12 and the shank 11 is worn due to the step generated in the joint 13 between the segment 12 and the shank 11 ( B) A phenomenon occurred. That is, chip powder or chips generated in the process of cutting the workpiece are rubbed in the process of being discharged to the junction 13 between the segment 12 and the shank 11, and the junction between the segment 12 and the shank 11 (13) There was an undercut (B) phenomenon in which abrasion occurred.

In this way, when an undercut (B) occurs at the junction (A) between the segment 12 and the shank 11 due to the step difference between the segment 12 and the shank 11, the segment 12 and the shank 11 There is a problem that the segment 12 is easily detached from the shank 11 due to a decrease in the bonding area of the liver.

The diamond tool needs to be replaced because the dropout of the segment 12 interferes with the normal cutting operation. This has caused the life of the diamond tool 10 to be shortened. In addition, it is necessary to prevent an undercut shape from occurring in terms of safety as well, since the safety of the operator may be impaired when the segment 12 is removed during the cutting operation.

In order to prevent the undercut phenomenon that occurs at the junction between the segment and the shank, a carbide block or another segment of the same thickness as the segment is attached to the front of the segment and slot in the cutting direction to provide abrasion resistance to chip powder or chipped chips. A technology for spraying the discharge path of powder or chips has been proposed, but this method is not easy to automate as the cemented carbide block or another segment must be attached through laser or brazing bonding, and the manufacturing time of the product is increased, resulting in mass production. This was difficult.

In order to solve this problem, for example, in Korean Patent Registration No. 10-0804049 (registration date: February 11, 2008), an auxiliary cutting part formed to be the same as the shank thickness and formed to a predetermined height and attached to the shank, and the auxiliary cutting part A segment including a main cutting portion formed integrally on the upper portion and formed thicker than the thickness of the auxiliary cutting portion was proposed.

In the segment proposed in Korean Patent Registration No. 10-0804049, chips and chips are discharged through the step difference between the main cutting part and the auxiliary cutting part, while providing a passage through which heat is discharged to improve cutting performance. By forming a wear-resistant area at the junction between the shank and the shank, the undercut phenomenon was prevented by increasing the durability.

However, the technology proposed in Korean Patent Registration No. 10-0804049 has prevented the occurrence of undercut to some extent by configuring the lower part of the segment in a two-stage structure with a step difference, but chip powder between the auxiliary cutting part of the segment and the shank B. There was a problem that undercuts still occurred at the junction between the segment and the shank due to the accumulation of chips.

KR 10-0804049 B1, 2008. 02. 11. KR 10-0575849 B1, 2006. 04. 25. KR 10-0584109 B1, 2006. 05. 22.

Therefore, the present invention has been proposed to solve the problems of the prior art, and increases durability by forming a wear-resistant region at the junction between the segment and the shank, and through this, wear due to chip powder or chips at the junction between the segment and the shank It is an object of the present invention to provide a disk-shaped diamond tool capable of preventing a segment from falling off from a shank by preventing an under cut phenomenon from occurring.

The present invention according to one aspect for achieving the above object is made in the form of a disk shank, the central axis is coupled to the power tool; And a segment formed on the outer periphery of the shank and divided by a plurality of slots formed to discharge chip powder or chips generated in the process of cutting the workpiece, wherein the segments are front, rear and left sides, respectively. , A hexahedron including a right side, an upper surface, and a lower surface, and the lower surface joined to the shank is inclined with a constant inclination so as to approach the central axis of the shank from the right side to the left side in correspondence with the rotation direction of the shank. It provides a disk-shaped diamond tool, characterized in that it has an inclined surface.

Preferably, the lower surface of the segment has a structure in which the right end is in contact with a circular virtual line centered on the central axis of the shank, and crosses the virtual line toward the left end of the lower surface to extend in the direction of the central axis of the shank. It can be characterized.

Preferably, the segment is manufactured by sintering in a state in which diamond abrasive grains are mixed with a paste-type binder as a main material, and the segment is a cutting part formed on the outer side of the virtual line with a junction formed inside the virtual line Compared to that, it may be characterized in that it is formed by mixing so that the density of diamond abrasive grains is low.

Preferably, the joint portion of the segment may be formed to have a hardness intermediate between the hardness of the cutting portion of the segment and the hardness of the shank.

Preferably, in order to reinforce both side surfaces of the outer peripheral portion of the shank exposed through the slot, the slot further includes side reinforcement portions respectively formed at left and right ends of the lower surface of the segment, and the side reinforcement portion increases the width of the slot. In order not to shrink, the surface exposed to the slot is aligned with the left and right surfaces of the segment in a vertical direction, and the side reinforcement part is manufactured by mixing diamond abrasive grains in the same manner as the segment. By mixing less, it may be characterized in that the hardness is formed to have an intermediate value between the segment and the shank.

Preferably, the shank has a receiving groove portion in which the front and rear surfaces of the upper end portion formed between the side reinforcement portions are recessed inward to accommodate chip powder or chips generated during a cutting operation, and a plurality of through holes in the receiving groove portion It can be characterized by being formed.

As described above, according to the present invention, the left side of the segment extends toward the outer circumference of the shank rather than the right side, so that the lower surface in contact with the outer circumferential surface of the shank is formed to be inclined to approach the central axis of the shank from the right end to the left end. Even if chips or chips are discharged during the work process, it is possible to solve the problem of undercut by preventing the concentration of wear on the junction between the shank and the segment. Through this, it is possible to improve durability by preventing the segment from falling off from the shank.

1 is a plan view illustrating a general disk (wheel) type diamond tool.
FIG. 2 is a cross-sectional view showing an enlarged connection portion between the shank and the segment shown in FIG. 1;
FIG. 3 is a view illustrating a process in which an undercut occurs at a junction between a segment and a shank due to a step difference occurring at a junction between a segment and a shank shown in FIG. 2;
4 is a plan view illustrating a disk-shaped diamond tool according to an embodiment of the present invention.
5 is an enlarged perspective view of any one of the segments shown in FIG. 4.
6 is a view illustrating a disk-shaped diamond tool according to another embodiment of the present invention.
7 is a view illustrating a disk-shaped diamond tool according to another embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to embodiments to be described later in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms.

In the present specification, the present embodiment is provided to complete the disclosure of the present invention, and to completely inform the scope of the invention to those of ordinary skill in the art to which the present invention belongs. And the invention is only defined by the scope of the claims. Thus, in some embodiments, well-known components, well-known operations, and well-known techniques have not been described in detail in order to avoid obscuring interpretation of the present invention.

In addition, the same reference numerals refer to the same components throughout the specification. In addition, the terms used in the present specification (referred to) are for explaining embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase. In addition, elements and operations referred to as'comprising (or having)' do not exclude the presence or addition of one or more other elements and operations.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used as meanings that can be commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not interpreted ideally or excessively unless defined.

Hereinafter, the technical features of the present invention will be described in detail with reference to the accompanying drawings.

4 is a plan view illustrating a disk-shaped diamond tool according to an embodiment of the present invention.

4, the disk-shaped diamond tool 20 according to the embodiment of the present invention is formed in a disk (wheel) shape and the central axis 21a is coupled to the power tool (not shown), and the shank 21 and the shank It is formed on the outer periphery of (21) and includes a segment (22) for cutting or polishing a workpiece (workpiece).

A plurality of slots 23 are formed in the segment 22 for discharging chip powder or chips generated in the process of cutting the workpiece to the outside. Accordingly, the segment 22 is divided into a plurality of segments along the outer peripheral surface of the shank 21 by the slot 23.

5 is an enlarged perspective view illustrating one of the segments shown in FIG. 4.

As shown in FIG. 5, the segment 22 is manufactured by mixing diamond abrasive grains with a paste-type binder, which is a main material, into a mold having a predetermined shape, and then applying pressure with heat.

When viewed in Fig. 4, this segment 22 is made of a substantially hexahedron including a front surface 22a, a rear surface 22b, a left surface 22c, a right surface 22d, an upper surface 22e, and a lower surface 22f. .

The segment 22 has an inclined inclined surface with a constant inclination so that the lower surface 22f joined to the shank 21 approaches the central axis 21a of the shank 21 from the right surface 22d to the left surface 22c. Have.

For example, in the segment 22, the right end (end in contact with the right side) of the lower surface 22f is in contact with the circular virtual line 1 centered on the central axis 21a of the shank 21, and the left end ( The end in contact with the left side) crosses the virtual line 1 and extends in the direction of the central axis 21a of the shank 21.

Preferably, the upper surface 22e of the segment 22 has the same height of the left end (the end in contact with the left side of the segment) and the right end (the end in contact with the right side of the segment), or has a step within 1 mm, and the lower surface (22f) has a structure inclined toward the central axis 21a of the shank 21 so as to approach the central axis 21a of the shank 21 from the right end to the left end.

This segment 22 has a structure in which the height increases from the right side 22d to the left side 22c in the direction of rotation of the shank 21 (refer to the arrow) during cutting. That is, in the segment 22, the height h1 of the right side 22d is larger than the height h2 of the left side 22c.

In this way, the left side of the segment 22 extends toward the outer circumferential side of the shank 21 rather than the right side, so that the lower surface 22f in contact with the outer circumferential surface of the shank 21 goes from the right end to the left end, the central axis of the shank 21 As it is formed inclined to be close to (21a), even if chip powder or chips are discharged during the cutting process, wear is prevented from being concentrated in the joint between the shank 21 and the segment 22 to solve the problem of undercut. I can.

Meanwhile, the shank 21 to which the segment 22 is joined is also formed to have an inclined surface inclined toward the central axis 21a from the right end to the left so that the outer circumferential surface corresponds to the shape of the lower surface 22f of the segment 22. Accordingly, it is possible to increase the bonding area with the segment 22.

In FIG. 5, the shank 21 and the segment 22 are formed to have the same thickness, but this is as an example, and the shank 21 bonded to the segment 22 so that heat is discharged while chip powder or chips are discharged. The outer periphery of the segment 22 may be formed to have a thinner thickness.

The present invention can form different densities of diamond abrasive grains contained in segments 22 formed inside and outside the virtual line 1 based on the virtual line 1 shown in FIG. 4.

Preferably, in the present invention, the lower end 221 (hereinafter referred to as a junction) of the segment 22 formed inside the virtual line 1 is an upper end formed outside the virtual line 1 with the virtual line 1 as a boundary ( 222) (hereinafter referred to as a cutting portion) is formed by mixing so as to have a lower density of diamond abrasive grains.

That is, in the present invention, the density of the diamond abrasive grains mixed in the bonding portion 221 is formed to be smaller (medium) than the density of the diamond abrasive grains mixed in the cutting portion 222 so that the hardness of the bonding portion 221 is approximately the cutting portion 222 It is formed to have an intermediate value between the hardness of the shank 21 and the hardness of the shank 21.

As described above, in the present invention, the hardness of the bonding portion 221 is formed to have a size intermediate between the hardness of the shank 21 and the hardness of the cutting portion 222, through which the hardness between the shank 21 and the bonding portion 221 By reducing the difference, it is possible to prevent the concentration of wear on the outer periphery of the shank 21 in contact with the joint 221 due to chip powder or chips generated during the cutting operation.

In other words, in the present invention, when abrasion due to chip powder or chipped chips, the shank 21 and the joint 221 having similar hardness are worn together to prevent the abrasion from being concentrated on the outer periphery of the shank 21. It is possible to prevent the occurrence of an undercut phenomenon in the outer periphery.

6 is a diagram illustrating a disk-shaped diamond tool according to another embodiment of the present invention, and is a perspective view illustrating an enlarged view of any one segment joined to a shank. Here, the description is omitted for convenience.

Referring to FIG. 6, a disk-shaped diamond tool 30 according to another embodiment of the present invention includes a shank 31, a segment 32 and a slot 33. In addition, side reinforcement portions respectively formed on the lower surface 32f of the segment 32 to reinforce both sides of the outer peripheral portion of the shank 31 in contact with the lower surface 32f of the segment 32 (surface exposed to the slot 33) ( 34).

The side reinforcement part 34, like the segment 32, is manufactured by mixing diamond abrasive grains with a paste-type binder which is a main material. At this time, the diamond abrasive grains are mixed less than the segment 32 so that the hardness has an intermediate value between the segment 32 and the shank 31.

These side reinforcement portions 34 are formed on the left side and the right side of the lower surface 32f of the segment 32, respectively, and the left side 32c and the left side 32c of the segment 32 so as not to reduce the width of the slot 33 A side exposed to the slot 33 in the vertical direction so as not to protrude from the right side 32d in the direction of the slot 33 is aligned with the left side 32c and the right side 32d of the segment 32.

7 is a diagram illustrating a disk-shaped diamond tool according to another embodiment of the present invention, and is a perspective view illustrating an enlarged view of any one segment bonded to a shank. Here, the description is omitted for convenience.

Referring to FIG. 7, a disk-shaped diamond tool 40 according to another embodiment of the present invention includes a shank 41, a segment 42, a slot 43 and a side reinforcement portion 44, and the shank ( 41) is formed with a receiving groove (41a) in which the front and rear surface portions of the upper end portion formed between the side reinforcement portions 44 are recessed inward to accommodate chip powder or chips generated during a cutting operation.

A plurality of through holes 41b may be formed in the receiving groove part 41a. Chip powder or chips generated during the cutting operation are accommodated in the receiving grooves 41a respectively formed on the front and rear sides of the shank 41, while they move freely to each other through the through holes 41b, and thus chip powder or chips are It is possible to prevent the back from being concentrated in the junction between the segment 32 and the shank 41.

As described above, in the present invention, the receiving groove portion 41a for accommodating chip powder or chips generated during cutting is formed on the upper portion of the shank 41 between the side reinforcing portions 44, and thus chip powder generated during the cutting operation. B. It is possible to prevent the occurrence of an undercut phenomenon in the joint between the segment 32 and the shank 41 by minimizing the friction of the chips and the like against the shank 41.

As described above, the technical idea of the present invention has been described in detail in the preferred embodiment, but the preferred embodiment is for the purpose of explanation and not limitation. As such, it will be understood by those of ordinary skill in the art that various embodiments are possible through a combination of the embodiments of the present invention within the scope of the technical idea of the present invention.

1: virtual line
10, 20, 30, 10: diamond tool
11, 21, 31, 41: shank
12, 22, 32, 42: segment
13, 23, 33, 43: slot
34: side reinforcement
41a: receiving groove
41b: through hole
221: junction
222: cutting part

Claims (6)

Shank made in the form of a disk and the central axis is coupled to the power tool; And
A segment formed on the outer periphery of the shank and divided by a plurality of slots formed to discharge chip powder or chips generated in the process of cutting the workpiece; Including,
Each of the segments consists of a hexahedron including a front surface, a rear surface, a left surface, a right surface, an upper surface, and a lower surface, and the lower surface joined to the shank corresponds to the rotation direction of the shank, so that the shank increases from the right surface to the left surface. Having a constant slope and an inclined slope to be close to the central axis,
Disc-shaped diamond tool, characterized in that.
The method of claim 1,
The lower surface of the segment has a structure in which the right end is in contact with a circular virtual line centered on the central axis of the shank, and crosses the virtual line toward the left end of the lower surface and extends in the direction of the central axis of the shank. Disc-shaped diamond tool made.
The method of claim 2,
The segment is manufactured by sintering in a state in which diamond abrasive grains are mixed with a paste-type bonding material, which is a main material, and the segment has a diamond joint formed on the inside of the virtual line compared to a cutting portion formed on the outside of the virtual line with the virtual line as a boundary. A disk-shaped diamond tool, characterized in that it is formed by mixing so that the density of abrasive grains is low.
The method of claim 3,
A disk-shaped diamond tool, characterized in that the joint portion of the segment is formed to have a hardness intermediate between the hardness of the cutting portion of the segment and the hardness of the shank.
The method of claim 1,
In order to reinforce both side surfaces of the outer peripheral portion of the shank exposed through the slot, the slot further includes side reinforcement portions respectively formed at left and right ends of the lower surface of the segment,
The side reinforcement portion is aligned with the left side and the right side of the segment in a vertical direction so as not to reduce the width of the slot,
The side reinforcement part is formed by mixing diamond abrasive grains in the same manner as the segment, but mixing less diamond abrasive grains than the segment so that the hardness has an intermediate value between the segment and the shank,
Disc-shaped diamond tool, characterized in that.
The method of claim 5,
The shank has a receiving groove in which the front and rear surfaces of the upper end formed between the side reinforcing parts are recessed inward to accommodate chip powder or chips generated during cutting, and a plurality of through holes are formed in the receiving groove. Disc-shaped diamond tool, characterized in that there is.

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