SU1164044A1 - Composition of abrasive bodies for vibration working - Google Patents

Abstract

COMPOSITION OF ABRASIVE BODIES FOR VIBR-TREATMENT, containing Al-, 03 ,. SiOj, MgO, CaO, Na.O and KjO, characterized in that, in order to increase processing performance by increasing the density of abrasive bodies, the composition additionally contains PBO in the following ratio of ingredients, wt.%: 39.0-62.0 AljO , SiO16, 0-39.0 2.0-5.0 MgO. . . .РвО 2.0-15.0, 0.5-1.5 0.5-1.5 CaO 5 Amount of Na, 0 0.5-2.0 and 20 (L

Description

The invention relates to the manufacture of an abrasive tool, in particular, abrasive bodies on a ceramic bond, used in vibroabrasive processing equipment for parts of various shapes and from different types of materials. The purpose of the invention is to reduce the processing time, i.e. an increase in processing productivity due to an increase in the density of abrasive bodies, which in turn makes it possible to reduce the wear of abrasive bodies. The composition of the abrasive bodies for vibration treatment consists of, MgO; FejO; CaO; K20 and RvO with the following ratio of ingredients, May.%; 2-5 2-15 0.5-1.5 0.5-1.5 Amount Na20 + K20 0.5-2 Lead oxide introduced into the composition of abrasive bodies for vibro-processing interacts with silica to form PbSiO already at t ° 580 ° C, the activation energy of the interaction process being only 12.8 kcal / mol. The resulting chemical compound melts at t, which is 120 lower than the melting temperature of lead oxide itself, the liquid formed at low temperature facilitates uniform wetting of the components of abrasive ceramics, accelerates and facilitates diffusion transfer processes, and gas separation processes, which ultimately accelerates em main process operation (firing) in the production of abrasive ceramics and allows you to spend it at a lower temperature (firing temperature is reduced in comparison with the prototype by 100-150 ° C) An intensive sintering process helps to obtain dense ceramics: The chemical interaction of the reactive, chemically active lead-containing binder with the surface of the abrasive grains contributes to the compaction and control of the composition. Liquid bonding sites initiate the nucleation of crystals in the bond and thereby contribute to its partial crystallization. Corundum grains are firmly bonded to each other by bridges of a partially crystallized inorganic bond, and the structure of the abrasive ceramics becomes strong and dense. The introduction of Pfe into the composition of abrasive bodies of less than 2% does not give a positive effect, and the introduction of more than 15% is not economically feasible, moreover, the introduction of more than 15% of lead oxide worsens the ductility and formability of the wet mixture. Example. The following materials were used to manufacture abrasive bodies from the proposed composition: talc, kaolin, feldspar, bentonite clay, PHO, PC-based grinding material, for example, sludge from normal electrocorundum; All materials are 63 microns. The raw materials were mixed in a paddle mixer for 601: 5 min. Water was fed and the mixture was moistened to a moisture content of 13–15%, the mixture was stirred for 1512 minutes. The resulting mixture was discharged in vacuums to averaged and a low porous mass was obtained. The blanks formed in the vacuum were loaded into a hydraulic press with a filter for stretching the mass, and abrasive bodies of a certain size were cut from the cords decorated with a filler, which dried at 120i5 ° C for 240 i ± 10 min. Dried abrasive bodies were sintered in an oven at 1100-1250 C for 180120 minutes. There were taken the compositions with the minimum, optimal and maximum content of PbO (examples 1-b), as well as compositions with the content of PbO beyond the specified limits (examples 7 and 8). And the composition corresponding to the prototype (example 9), I. Table 1 shows the ratios of the starting charge materials. Table 2 shows the chemical components of abrasive bodies after firing, Table 3 shows the density, wear of samples of abrasive bodies and the time of processing parts with samples of abrasive bodies, From table. 3 it follows that the density of the abrasive bodies of the proposed composition is on average 4.8% higher than the density of the abrasive bodies of the prototype ,; wear of the abrasive bodies of the proposed composition is on average 10% lower than wear ab31164044. four

prototype bodies; The time is about 22.4% less than the time needed to process parts with abrasive rubbing bodies with abrasive bodies according to the proposed composition, on average, totype.

5T a b l and c a 1

talted

new innovation

talnoe

X Average of three prototype formulations

Table 3

Claims (2)

COMPOSITION OF ABRASIVE BODIES FOR VIBRATION PROCESSING, containing A1 _g O ₃ ,. SiO ₂ , MgO, Fe ₂ O ₃ , CaO, Na ₂ 0 and K _a 0, characterized in that, in order to increase processing productivity by increasing the density of abrasive bodies, the composition additionally contains PbO in the following ratio of ingredients, wt.%: A1 ₂ O ₃ '39.0-62.0 Si0 ₂ 16.0-39.0 MgO. 2.0-5.0 RvO 2.0-15.0 Fe ₂ d ₃ 0.5-1.5 CaO 0.5-1.5 The sum of Na ^ O and K ₂ 0 0.5-2.0