MACHINING WHEEL

Technical Field

[1] The present invention relates to a machining wheel, and more specifically to a machining wheel rotatably mounted to a grinder and coming into contact with a workpiece while rotating at a high speed to perform a grinding or cutting operation on the workpiece. Background Art

[2] A general machining wheel includes a metallic disk and diamond abrasive particles attached to the edge surface of the disk. An insertion hole is formed at a center of the disk and is inserted onto a rotating shaft of a grinder. The disk is also termed a "shank".

[3] The machining wheel can be manufactured by interposing a brazing material between the disk and the diamond abrasive particles and heating the disk to a high temperature to attach the diamond abrasive particles to the surface of the disk. This process is called "melt-bonding". When the machining wheel is in use, the problem is caused that the disk may be distorted by thermal deformation.

[4] Another problem of the machining wheel during use is that cut chips from a workpiece do not escape readily, resulting in a reduction in grinding speed.

[5] Another problem of the machining wheel during use is that heat released from the disk by the friction of the machining wheel against a workpiece does not escape readily, resulting in deterioration of durability. Disclosure of Invention Technical Problem

[6] The present invention has been made in an effort to solve the problems of the prior art, and it is an object of the present invention to provide a machining wheel constructed such that cut chips from a workpiece and heat from a disk readily escape without thermal deformation of the disk. Technical Solution

[7] According to an aspect of the present invention to accomplish the above object, there is provided a machining wheel comprising a metallic disk and diamond abrasive particles attached to the edge surface of the disk wherein a plurality of through-holes are formed in an edge portion of the disk so as to penetrate the upper and lower surfaces of the disk.

[8] In a preferred embodiment, the through-holes are arranged along arc- shaped curves.

[9] In a preferred embodiment, a straight line connecting both ends of each of the arc- shaped curves is inclined at an angle of 30°to 50°relative to the radial direction of the disk. [10] In a preferred embodiment, the diamond abrasive particles are attached to the edge surface of the disk by melt-bonding a brazing material interposed between the diamond abrasive particles and the disk.

Advantageous Effects

[11] When the disk is heated to a high temperature in the manufacture of the machining wheel of the present invention by melt-bonding, the plurality of through-holes formed in an edge portion of the disk, to which the diamond abrasive particles are attached, provide spaces to compensate for the thermal expansion of the disk to prevent the disk from being distorted by thermal deformation. [12] In addition, when the machining wheel of the present invention is in use, cut chips from a workpiece escape through the through-holes, resulting in an increased grinding speed. [13] Furthermore, heat released from the disk by the friction of the machining wheel of the present invention against a workpiece readily escapes through the through-holes, resulting in improved durability.

Brief Description of Drawings [14] FIG. 1 is a perspective view of a machining wheel according to an embodiment of the present invention. [15] FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1.

Best Mode for Carrying out the Invention [16] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. [17] FIG. 1 is a perspective view of a machining wheel 1 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line A-A of

FIG. 1. As illustrated in FIGS. 1 and 2, the machining wheel 1 comprises a metallic disk 10 and diamond abrasive particles 20 attached to the edge surface of the disk 10. [18] The machining wheel has an insertion hole 11 formed at a center of the disk 10 and inserted onto a rotating shaft of a grinder. [19] A brazing material 30 is interposed between the diamond abrasive particles 20 and the disk 10 and is melted to attach the diamond abrasive particles 20 to the edge surface of the disk 10. Examples of the brazing material 30 include Ni-, Ag-, Co- and

CuSn-based brazing materials. [20] In this embodiment, a plurality of through-holes 13 are formed in an edge portion of the disk 10, to which the diamond abrasive particles 20 are attached, so as to penetrate the upper and lower surfaces of the disk 10. [21] It is preferred that the through-holes 13 are arranged along arc- shaped curves. It is preferred that a straight line connecting both ends of each of the arc-shaped curves is inclined at an angle of 30° to 50°relative to the radial direction of the disk 10. In this embodiment, the through-holes 13 are arranged along arc- shaped curves inclined at an angle of about 45°relative to the radial direction of the disk 10.

[22] When the disk 10 is heated to a high temperature in the manufacture of the machining wheel 1 by melt-bonding, the plurality of through-holes 13 formed in an edge portion of the disk 10, to which the diamond abrasive particles 20 are attached, provide spaces to compensate for the thermal expansion of the disk 10 to prevent the disk 10 from being distorted by thermal deformation.

[23] According to the embodiment of the present invention, when the machining wheel 1 is in use, cut chips from a workpiece escape through the through-holes 13 formed in an edge portion of the disk 10, to which the diamond abrasive particles 20 are attached, resulting in an increased grinding speed.

[24] In addition, when the machining wheel 1 is in use, heat released from the disk 10 by the friction of the machining wheel 1 against a workpiece readily escapes through the through-holes formed in an edge portion of the disk 10, to which the diamond abrasive particles 20 are attached, resulting in improved durability.

[25] While the invention has been particularly described with respect to the specific embodiments, it will be evident to those skilled in the art that many modifications, variations and changes are possible without departing from the spirit and scope of the present invention as set forth in the appended claims. Therefore, it should be understood that the description and drawings herein are merely illustrative and are not to be construed as limitations of the invention.