JPH04250981A - Super abrasive grain grinding wheel - Google Patents

Abstract

PURPOSE:To easily cleave aggregate cotacted with a work piece and reduce heat generation due to friction through high lubricating ability of carbon or diamond powder on the inside by forming the aggregaste out of carbon or diamond powder coated with metal or ceramics. CONSTITUTION:Aggregate 2 is formed out of carbon or diamond powder 1 coated with metal or ceramics. This aggregate 2 and diamond abrasive grains or CBN abrasive grains 3 are combined together through binder 4 to make a desired super abrasive grain grinding wheel.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superabrasive grindstone.

0002

[Prior Art] Conventionally, diamond abrasive grains or C
In order to reduce grinding resistance and cost in a whetstone in which BN abrasive grains are bonded with a vitrified binder,
Some of the diamond abrasive grains or CBN abrasive grains are
There is a method in which ceramic particles such as O3 and SiC are used as an aggregate to reduce the concentration of diamond abrasive grains or CBN abrasive grains.

0003

[Problem to be solved by the invention] With the above structure,
There is a problem in that the ceramic particles replaced as aggregate during grinding come into contact with the workpiece and generate heat, which tends to cause grinding burn on the workpiece.

0004

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and a grinding wheel is made of carbon or diamond powder coated with metal or ceramics as an aggregate, and this aggregate and diamond It is characterized by bonding abrasive grains or CBN abrasive grains with a binder.

[0005]

[Operation] When grinding a workpiece with a grindstone, the aggregate that comes into contact with the workpiece is easily cleaved, and the high lubricity of the carbon or diamond powder inside reduces heat generation due to friction and has good thermal conductivity. Therefore, the conduction of heat to the workpiece is suppressed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 shows the shape of a superabrasive grindstone according to the present invention. FIG. 2 shows an enlarged view of the structure of the grindstone layer provided on the surface layer 10. In FIG. 2, 3 is an abrasive grain made of diamond or CBN. Reference numeral 2 is aggregate, which is substituted for part of the abrasive grains 3 to reduce grinding resistance and cost. The aggregate 2 has a structure in which carbon or diamond powder 1 is surrounded by a metal or ceramic coating layer 6. The abrasive grains 3 and the aggregate 2 are bonded together with a vitrified binder 4 while maintaining appropriate pores 5. The purpose of coating the aggregate 2 with metal or ceramics is to prevent the carbon or diamond powder 1 inside from being oxidized even when the grindstone is fired in an air atmosphere.

When a workpiece is ground using a superabrasive grindstone having such a structure, the abrasive grains 3 made of diamond or CBN come into contact with the workpiece, producing a grinding action. that time,
The aggregate 2 also comes into contact with the workpiece, but the aggregate 2 is easily cleaved and the carbon or diamond powder 1 inside spreads between the grinding wheel and the workpiece, due to the high lubricity of the carbon or diamond powder 1. Heat generation due to friction is reduced. Furthermore, carbon or diamond powder 1 is
Good thermal conductivity reduces heat conduction to the workpiece,
Prevents grinding burn from occurring on the workpiece.

[0008]

Effects of the Invention As described above, the superabrasive grindstone of the present invention uses carbon or diamond powder coated with metal or ceramics as an aggregate, and combines this aggregate with diamond abrasive grains or CBN abrasive grains with a binder. Because it has a combined structure, when grinding a workpiece,
The aggregate that comes into contact with the workpiece is easily cleaved, and the high lubricity of the internal carbon or diamond powder reduces heat generation due to friction, and its good thermal conductivity suppresses heat conduction to the workpiece. , it is possible to prevent grinding burn from occurring on the workpiece.

[Brief explanation of the drawing]

FIG. 1 is an overall view of a grindstone of the present invention.

FIG. 2 is an enlarged view of the structure of the grindstone layer of the present invention.

[Explanation of symbols]

1. Carbon or diamond powder 2. Aggregate 3 Abrasive grains 4 Binder 6 Coding layer

Claims (1)

[Claims] 1. A superabrasive grindstone in which carbon or diamond powder coated with metal or ceramics is used as an aggregate, and this aggregate and diamond abrasive grains or CBN abrasive grains are bonded with a binder.