SU852926A1 - Method of producing polishing composition - Google Patents

Description

54) METHOD OF OBTAINING POLISHING COMPOSITION

one

The invention relates to the field of machining of non-metallic materials, namely to the field of polishing compositions used to process glass.

A known method for producing a polishing composition (polyrite) by thermo-breaker at 900-950 ° C is a mixture of carbonates of rare-earth metals 1.

Polyrite does not correspond in its polishing ability to constantly increasing due to the introduction of high-speed progressive methods of glass processing and an increase in the volume of output products of the requirements of optical-mechanical manufacturing to the polishing quality of polishing compositions.

The aim of the invention is to increase the polishing ability, composition.

This goal is achieved by the fact that boron oxide or boric acid (in terms of boron oxide) is preliminarily introduced into the mixture of carbonates of rare-earth metals (REM) at a subsequent weight ratio of the components, respectively 85-97: 3-15,

The quantitative composition of rare earth carbonate is, wt%: 52 Cei (CO) j,; 26.5 Lao (CO) a; 16 Nd, (CO ,,) ,,;.. 5.5 .Oh ..

The mixture of carbonate of rare-earth metals is mixed with boron oxide or boric acid in given weight ratios, and then calcined in a muffle furnace at 900-95 ps for 1 hour.

Polishing compound tested

10 in conditions close to production when polishing optical parts with a diameter of 75 mm made of glass of the most common brand K 8 on the aim-200 machine in modes: speed

5 spindle spins 100 rpm, the specific pressure of the polishing tool, glass pressure 100 g / cm, the material of the polishing tool is peccan resin. Sand glass.

20 diamond tools. The microgeometry of the grinding surface corresponds to V 10, the accuracy of processing 2-3 interference rings, the concentration of the aqueous suspension,

25 The polishing ability of the powder is estimated by the amount of polished glass from the surface of the part processed within 30 min. (Mg / 30 min /.

Claims (1)

The test results are presented in the table. REM carbonates (REM carbonate Boron oxide boron oxide, which exceeds the capacity of the roval-like composition, by the treatment of boron oxide, and at an optimal ratio, an increase or decrease in the injected boron oxide relative to the boundary content (3 and 15%) does not cause a noticeable improvement in the polishing ability of the polishing compound. No scratches, spots, patches or other defects are observed on the surface of polished glass. A change in the heat treatment temperature of the composition within 900-950 ° C does not change the polishing quality polishing composition. Increasing the calcination temperature of the composition above 950s results in scratches on the polished glass surface. The polishing ability of the proposed polishing composition, heat-treated at temperatures below, well below C8500s, 1 h, B, j, 0 ", 10%, P 44 mg / 30 min) The results of tests of the polishing composition added to the cd mixture of rare-earth metals of boric acid in terms of boron oxide is identical to the results of testing the composition obtained under the same conditions with a similar amount of boron oxide injected. The method of obtaining a polishing composition by heat treatment at 900950 ° C of a mixture of carbonates of rare-earth metals, characterized in that, c. the purpose of increasing the polishing ability of the composition in the mixture of carbonates of rare earth metals previously; boron oxide or boric acid (in terms of boron oxide) are introduced at the following weight ratio of components, respectively 85-97: 3-15. Sources of information taken into account in the examination 1. Vinokurov V. I. Study of the process of polishing glass. M., Mashinostroe., 1967, p. 79.