CS213459B1 - Mixture for active abrasive layer tools - Google Patents

Abstract

Mixture for active abrasive layer of tools. It relates to the field of powder metallurgy. The invention provides a composition of a mixture for active abrasive layer of tools consisting of abrasive grains of diamond, cubic boron nitride, a metal binder and optionally with metal or non-metallic additives. The essence of the invention lies in the fact that it contains 1.5 to 45% by weight of diamond and/or cubic boron nitride, 60 to 93% by weight of cobalt, 2 to 30% by weight of tungsten carbide and 3 to 25% by weight of copper.

Description

BACKGROUND OF THE INVENTION The present invention relates to an active tool abrasive layer composition consisting of diamond abrasive grains consisting of diamond abrasive grains, cubic boron nitride, a metallic binder and optionally metal or non-metallic additives.

Successful development of current grinding technology, efforts to increase productivity and efficiency of grinding, increasing production accuracy and improving surface roughness, the increasing use of hard and hard-to-machine materials is now unthinkable without the use of grinding tools with very hard abrasive grains. Grinding productivity and tool life mainly depend on the appropriate composition of the abrasive layer. Commercial tools with a very hard structure prematurely lose grinding performance by blinding abrasive grains, requiring frequent artificial stripping of abrasive grains by grinding the abrasive layer. This reduces tool life and grinding productivity and increases production costs.

The above-mentioned disadvantages are overcome by an active tool abrasive layer composition consisting of diamond abrasive grains, cubic boron nitride, a metal binder and optionally metal or non-metallic additives according to the invention, comprising 1.5 to 45 wt. % of diamond and / or cubic boron nitride, 60 to 93 wt.%, cobalt, 2 to 30 wt. % tungsten carbide and 3 to 25 wt. copper.

The advantage of the active abrasive layer composition according to the invention is that the abrasive layer wear is substantially reduced and the grinding performance is improved. MPLEMENTATION ^t test abrasive products prepared with the composition nevi abrasive layer during grinding optical glass shown by 100 to 200% more efficiently utilization of the diamond; During the grinding process, they maintained a uniform performance without artificially exposing the abrasive layer against commercial production tools.

The principle of the production technology of the abrasive layers prepared from the mixtures according to the invention consists in homogenizing the abrasive layer mixture, pressing it into the desired shape and sintering. By varying the ratio of the individual components of the abrasive layer, the mechanical properties, in particular the abrasion resistance and the grip strength of the abrasive grains, can be varied to a large extent.

Example 1

An example of the composition of an active abrasive layer produced by conventional powder metallurgy processes (in% by weight):

% diamond or cubic boron nitride% cobalt% tungsten carbide% copper.

The composition of the active abrasive layer has proved successful in fine mechanical grinding of optical glass, products of various types of ceramics and in manual grinding of sintered carbides.

Example 2

Example of reduction of active abrasive layer produced by conventional powder metallurgy processes (in% by weight):

% diamond 60% cobalt 20% tungsten carbide 5% copper.

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The composition of the active abrasive layer has proven to be particularly suitable for rough grinding of brittle materials (glass, ceramics, stone, cemented carbide).

Example 3

Example of composition of active abrasive layer produced by conventional processes of powder metallurgy (in% by weight):

% diamond% cobalt% tungsten carbide% currency.

The composition of the active abrasive layer is particularly advantageous for productive grinding of brittle and tough materials on grinders having sufficient rigidity.

In all the above-mentioned composition examples, a significantly longer service life has been demonstrated compared to commercial tools.

Claims (1)

A composition for an active abrasive layer of tools consisting of diamond abrasive grains, cubic boron nitride, a metal binder and, optionally, metallic or non-metallic additives, characterized in that it contains 1.5 to 45% by weight. % of diamond and / or cubic boron nitride, 60 to 93 wt. % cobalt, 2 to 30 wt. % tungsten carbide and 3 to 25 wt. copper.