SU946899A1 - Mass for making abrasive tool - Google Patents

Description

(5) MASS FOR THE MANUFACTURE OF ABRASIVE TOOL

The invention relates to the manufacture of an abrasive tool, mainly for high-speed work, and is intended for use in the operations of cutting materials, cutting and finishing of the cutting tool and fine grinding in the tooling, engineering, automotive and other branches of the national economy. The known mass for the manufacture of abrasive tools, including abrasive (LL, phenol-formaldehyde resin and fillers — cryolite and calcium oxide. The mass provides an improvement in the performance indicators of the tool made from it. 1 However, the mass does not meet modern technical requirements of consumers. The purpose of the invention is to increase durability and grinding coefficient of the abrasive tool. The goal is achieved by the fact that in the mass containing the abrasive, humidifier, binder and filler cryolite, A mixture of a dispersion-strengthening filler, for example titanium oxides or zirconium oxides, and a solid lubricant, for example zinc oxides or cadmium, are introduced at a ratio of 1: 3 to 3: 1 (by volume) and in an amount of 2.5 to 75 vol .; the total content of the filler. The content of each of them is (0.5–20)% by volume of the total content of the binder and humidifier, and the total content of oxides is (1.0–30)% by volume of the total content of the binder and humidifier, in the following ratio of mass components,% by volume: 59.0-62.8 Abrasive 15.0-20.0 Binder 6.0-11.5 Moisten 10.0-O, O Filler 3 The above metal oxides are used mainly in the form of fine particles with a size of 100 microns or less, and as an abrasive, it is most advisable to introduce E the composition of the mass of doped electrocorundum (titanium, chromic titanium or chromic), including including in the form of a mixture with white or normal Electrocorundum at a ratio of their graininess from 2.5: 1 to 1: 2.5, while the grain of one of them should be higher. The positive effect achieved when introduced into an abrasive mass containing an abrasive, a humidifier, a binder and a filler, for example cryolite, mixtures of THfaHa or zirconium oxides and zinc oxides or cadmium at the proposed ratios, is explained as follows. Fine titanium or zirconium oxides improve the physico-mechanical properties of abrasive mass due to their thixotropic properties and the effect of dispersion hardening, which contributes to the most compact and dense packing of solid particles (abrasive grains and filler) in the abrasive mass during tool molding. Increasing the strength of the abrasive mass leads to an increase in tool life during operation. At the same time, having abrasive properties, particles of titanium oxide or zirconium oxide are directly involved in the grinding process. On the other hand, the oxides of zinc or cadmium, performing the main function of solid lubricant, contribute to the formation of chelate compounds of phenol-formaldehyde resins, i.e. their stitching, which also provides increased strength of the abrasive mass. Along with this, the main filler, for example, cryolite, used in the form of particles with a size of 200-100 microns, improves the technological properties of the abrasive mass, reduces its clodiness, and acts as a solid. The contents of the components are 94 lubricants during operation of the tool. Due to the quantitative ratio and the difference in the geometric dimensions of the fillers, the conditions for their alternate and interconnected work are created. The quantitative ratio of titanium or zirconium oxides and zinc oxides or cadmium among themselves and with the main filler of cryolite is optimal, since a decrease or increase in the content of the inventive mixture of oxides in the abrasive mass leads either to a decrease in its strength and durability of the tool. mass strength, in which the process of self-sharpening abrasive grains on the tool surface is difficult. A change in the ratio between the disperse-reinforcing filler and the solid lubricant in the mixture, respectively, leads either to an increase in the component of friction in the grinding work or to its significant decrease. which in both cases leads to a decrease in the cutting ability of the tool. Thus, the optimum conditions for the operation of the tool are provided by a set of interrelated properties and characteristics of the claimed components of the abrasive mass. The manufacture of the abrasive mass is carried out by successively mixing the abrasives and introducing into the resulting mixture a humidifier, fillers and a binder, followed by rubbing the abrasive mass through the net. From the finished abrasive mass by cold or warm pressing, tool blanks of the required geometric dimensions are formed and they are heat-treated with curing at 150-190 ° C. Table. 1 shows the data components in the formulation, in table. 2 - properties of components. In tab. 3 presents the properties of the proposed abrasive mass in comparison with the prototype. 7a Table PTU, vol.

Silicon carbide black 63C25 10.6

Liquid bakelite (humidifier) 5.3 Grinding coefficient. According to GOST 21973-76 1.2-1.9 Quality Good surface Circle durability until full wear, pieces

Continued table. one

12.0 12.5 12.6 10.6 12.6 9.6 9.68.05.30 9.0

Table 2 Good Ho 413, 5 Wash Good Good Burns 80 Does not work 100 110

Table 3

Claims (1)

Claim A mass for the manufacture of an abrasive tool, including an abrasive, a humidifier, a binder and a cryolite filler, characterized in that, in order to increase the resistance and grinding coefficient of a tool made from it for high-speed processing, it additionally contains fillers selected from the groups of titanium or zirconium oxides and oxides zinc or cadmium in an amount of 2.5 “75 about L of the total filler content in the mass at a ratio between them (1: 3)” (3-'1), while the content of each of them is (0.5 ~ 20) about .% of total the binder and humectant content, and the total oxide content of 1.0-30 vol.% of the total binder and humectant content, in the following ratio of mass components, vol. %: Abrasive 59.0-62.8 Binder 15.0-20.0 Humidifier 6.0-11.5 Filler 10.0-14.0