CS267589B1 - Cutting lubricant for brittle materials' power form grinding - Google Patents

Abstract

The solution relates to the composition of the cutting fluid for power grinding of brittle materials especially glass, glass ceramic materials and corundum ceramics. Grinding is carried out using a water-based diamond with ingredients. The system of these additives in an amount of 1 to 10 parts by weight per 100 parts by weight of water is formed triethanolamine in an amount of 70 to 95 parts by weight and 5 to 30 parts by weight parts of sulfate ester with carbon numbers in particular C ^ g and antifoam and lubricant 0.1 to 0.5 wt parts, preferably methyl silicone oils.

Description

The invention relates to a cutting fluid for high-performance grinding of brittle materials, in particular glass, glass-ceramic materials and corundum ceramics, using a water-based diamond with additives.

Previously known cutting fluids, consisting only of water or water and a mixture of amino alcohol with polyhydroxyparaffin solvents or possibly also cutting oils, do not sufficiently support the regeneration of the effective active surfaces of diamond tool layers during power grinding of brittle materials. They do not reduce the friction of the resulting diamond tips well, they do not dissipate heat from the working zone so that there is no oxidation of diamond grains and their modification change into graphite. There is also no wettability of the machined materials and dispersion of the grinding products without corrosive effects on the base material. Hygienic conditions are also disadvantageous, as bacterial decomposition of emulsions often occurs and fire safety principles can be violated if cutting oils are used. If the coolant does not function properly, the passive pressures between the workpiece and the tool increase, which leads to undesired mechanical stress on the spindles and connecting parts. These technical shortcomings of the cutting fluids used so far also result in low performance and tool life, which lose their cutting efficiency relatively quickly in the grinding process. For this reason, frequent regeneration of these tools is necessary! regrinding, which, however, leads to a reduction in the volumetric efficiency of the diamond grinding tool,

For these reasons, there has been a need to design a cutting fluid that substantially reduces these shortcomings and is applicable to grinding brittle materials, especially optical glass, as well as more difficult to machine corundum materials. At the same time, hygienic, safety and ecological standards must be observed both during its use and during their disposal.

This object is achieved by the subject of the invention, which is a cutting fluid for high-performance grinding of brittle materials, in particular glass, glass-ceramic materials and corundum ceramics, using a water-based diamond with additives.

The essence of the invention lies in the fact that the system of additives in the amount of 1 to 1C parts by weight per 100 parts by weight of water consists of triethanolamine in the amount of 70 to 95 parts by weight and 5 to 30 parts by weight of sulfate ester of fatty acid mixture with carbons up to C, _n , predominantly composed of C 18 and antifoaming and lubricating agents in an amount of 0.1 to 0.5 parts by weight, preferably methyl silicone oil.

The cutting fluid according to the invention prevents the deposition of an undesired layer of dispersion products on the surface of the tool by its physicochemical properties. It supports spontaneous regeneration, has sufficient cooling and lubricating effects, enabling effective use of the performance properties of diamond during shaping grinding of brittle materials.

Example 1

When grinding optical glasses with a large-area tool consisting of tablets / 15 x 5 mm, containing bound diamond dust with a grain size of 100 to 125 .mu.m in a metal bond, a cutting fluid consisting of 100 parts by weight of water with 1 part by weight of a mixture consisting of 80 parts by weight of triethanolamine and 20 parts by weight of a sulfated synthetic ester of a mixture of higher fatty acids, liquefaction oil. 0.1 part by weight of methylphenylsilicone oil was added to the cutting fluid thus prepared. In all cases of grinding various types of optical glasses, the need for regeneration by regrinding was significantly reduced and the performance was increased by an average of 25% compared to existing cutting fluids.

Example 2

A cutting fluid consisting of 100 parts by weight of water and 5 parts by weight of the ingredients of the mixture composed according to Example 1 was used to machine the spherical corundum heads of the artificial hip joint with a diameter of δ = 32 mm. from 100 to 125 .mu.m without technological difficulty and the output is increased by more than 60 compared to existing cutting fluids.

Claims (1)

Cutting fluid for high-performance grinding of brittle materials, in particular glass, glass-ceramic materials and corundum ceramics, with water-based diamond with additives, characterized in that the system of additives in an amount of 1 to 10 parts by weight per 100 parts by weight of water consists of triethanolamine in 70 to 95 parts by weight and 5-30 parts by weight of the sulfate ester of a fatty acid mixture with the number of carbons in Cjg to ^ 22 '^ ^{P eva} "ho in the number of C ^ g protipěnicími and lubricating agents in an amount of 0.1 to 0.5 weight parts, preferably methylsi 1 icon oil.