SU1255412A1 - Impregnating composition for ceramically bonded abrasive tools - Google Patents

Abstract

This invention relates to the abrasive machining of titanium alloys. The purpose of the invention is to increase the durability of the wheels and the grinding ratio by impregnating the wheels with compositions comprising an alkali metal halide. As the latter, potassium bifluoride is introduced in the following ratio of components, wt.%: Potassium bifluoride 4-24, water the rest. The most effective composition, including potassium bifluoride in the form of 4-24% aqueous solution.

Description

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The invention relates to abrasive machining, in particular, to compounds for the impregnation of an abrasive tool on a ceramic bond, used mainly in grinding titanium-alloys without the use of coolant,

The purpose of the invention is to increase the durability of the wheels and the grinding coefficient by increasing the degree of lubrication of the surface to be treated due to the used impregnator,

The proposed composition for the impregnation of an abrasive tool contains as an alkaline metal halide potassium bifluoride in the following ratio of components, wt.%; potassium bifluoride 4-24, water the rest. Potassium bifluoride decomposes to form active fluorine atoms. The fluorine atoms and hydrogen fluoride formed during its decomposition are more active with respect to titanium than potassium bromide and borma atoms. In addition, as a complex compound, potassium bifluoride decomposes at relatively low temperatures (310-440 ° C).

The effect of the use of potassium bifluoride leads to an increase in the stability of the abrasive tool and a grinding coefficient. This is due to the formation of boundary lubricants in the process of grinding preventing the setting of juvenile surfaces of the grain and the titanium alloy being processed. These boundary lubricants are formed as a result of the chemical reaction of titanium with the decomposition products of potassium bifluoride. The effective concentration of potassium bifluoride is determined by the area of boundary lubricant formed. When potassium bifluoride is concentrated in a solution of less than 4 May -, an insufficient amount of active decomposition products is formed, which leads to an increase in the area of adhesion of juvenile surfaces, as a result of a decrease in the area of boundary lubricant formed. When the concentration of potassium bifluoride is reached in a solution of 24 May.%, The adhesion setting of juvenile surfaces is almost completely excluded, and a further increase in concentration does not lead to a decrease in grinding effort. Together

while increasing the concentration of potassium bifluoride, the pore volume decreases, which leads to worsening grinding conditions,

The compositions are prepared by dissolving potassium bifluoride in water in the indicated ratios at 15–40 ° C. Impregnation of an abrasive tool on a ceramic bond is carried out by the method of Free capillary lift when immersed in a solution at 0.8 tool heights. The impregnation time is 30-120 s, depending on the size and shape of the abrasive tool. After impregnation, the abrasive tool is dried for 1-3 days at 15-30 ° C or 3-5 hours at 110-120 ° C.

After drying, the amount of potassium bifluoride in circles with a hardness of CM2 is 0.35-2.0% of the mass of the circle with a solution concentration of 4-24 wt%, since the pore volume for the circles of this hardness is 40.5%.

Tests of impregnated wheels (64С25ПСМ27КЗ) were carried out on the machine model ЗГ71. Grinding modes: speed of a circle of 30 m / s; part speed 0.1 m / s; grinding depth 0.01 mm / stroke. The cling material is a heat-resistant titanium alloy VTZ-1,

The test results of the impregnated circles are given in tabghatse.

Analysis of the obtained results shows that the proposed impregnating composition (4-24% aqueous solution of potassium bifluoride) provides an increase in durability up to 1.4 times, a grinding coefficient by 1.3 times, a grinding force reduced to 1.25 times. Best results are obtained when the ratio of components, wt.%; potassium bifluoride 8-16; water the rest.

Claims (1)

Invention Formula  A ceramic bonded tool for impregnating an abrasive tool containing an alkali metal halide and water, characterized in that, in order to increase tool durability, potassium bifluoride was added to the composition as follows: , wt.%: Potassium bifluoride 4-24 Water Else Editor O. Yurkovetska Compiled by V.Vorobyov Tehred V.Kadar Order 4763/18 Circulation 740 Subscription VNRSHPI State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4, Proofreader V. But ha