SU1275030A1 - Compound for producing grinding material - Google Patents

Abstract

The invention relates to the production of grinding materials from sintered ob-alumina used in the manufacture of abrasive tools for power abrasive grinding, as well as vibroabrasive machining in mechanical engineering. The purpose of the invention is to increase the abrasive ability of the grinding material - using the SPTU 2-010-76 fine-particle alumina dust with a particle size of 1-6 microns, an electrocorundum powder with a particle size of 1040 microns and bentonite clay in the composition of the calcination product with a particle size of 1040 microns and bentonite clay. , May.%: highly dispersed alumina dust 40-80; electrocorundum powder 10-50; bentonite clay 9.5-10.5. The proposed formulation allows to obtain with S. grinding materials with abrasive ability are 17% higher than that of the prototype, (L and 40% higher than that of the base domestic material, without deteriorating the mechanical strength. Table 1.

Description

HS

SP

The invention relates to the production of grinding materials from sintered o (:. - alumina used in the abrasive industry in the manufacture of abrasive tools for power abrasive grinding of various types of rolled products, and also as an abrasive filler in vibroabrasive machining in engineering,

The purpose of the invention is to increase the abrasive ability of the grinding material.

15 As a starting material, the product of calcination of alumina hydrate is a highly dispersed aluminous dust with a particle size of microns threshold of electrocorundum with a particle size of 10-40 microns in the form of micro-powders M10-M28 of white or normal electrocorundums or sludges, obtained in the production of various ions of electrocorundums, 1: apr. chromium-titanium electrocorundum sludge and bentonite. The components are mixed in a wet-eyed glitter mill. The resulting slip is sephined and dehydrated in a filter press. The dehydrated mass is evacuated, extruded through spinnerers of a given cross section and size, dried and cut into individual grains. The obtained semi-finished product about kigak) T in the mixing furnace at 1620-1700 C, depending on the composition within 30-60 minutes,

3 As a result of recrystallization sintering, prismatic alumina crystals with a size of 1-3x3-10 microns are formed from particles of an alumina product, which combine recrystallized crystals of 10-40 microns in size, obtained from corundum-containing additives and having an isometric shape into a single dense structure of micropowders and white corundum lice and rhombohedral form - of micropowders and sludges of normal electrocorundum .:

Testing the abrasive ability of samples of grinding materials is carried out on

the device according to the method of grinding the sample melod by steel glass disks at 800 revolutions.

Mechanical strength rating

the crushing method on the ASZ-1 device with the pressing force of the upper ring 40 N, the speed of rotation of the lower ring 0.31 m / s and the test time 60 ± 1 s.

O., Variants of the composition and properties of the resulting grinding, ny material are given in the table.

From the data in the table it can be seen that with the exorbitant content of the components

5 As part of the image, the ability and mechanical strength of the grinding material is lower than the known.

When used, shea powder of electrocorundum with a particle size less than

The 10 µm abrasive capacity is reduced, and more than 40 µm the mechanical strength of the grinding material deteriorates.

The proposed composition allows to obtain grinding grinders with an abrasive ability 17% better than the known and 40% Bbmje than the base material without degrading the strength characteristics. 0

Formula inventions

The composition for obtaining grinding material based on sintered oi-alumina, including highly dispersed corundum-containing powder, characterized in that, in order to increase abrasive ability, it contains as corundum-containing powder electrocorundum with a particle size of 0-40 microns and additionally highly dispersed alumina powder bentonite clay with the following ratio of components, wt.%;

Highly dispersed

40-80

alumina a hundred dust

Bentonitov 1lin 9, 5-10,5

Electrocorundum with a particle size of 1040 microns

Rest

The proposed composition

Known composition

1.5

50 50 7

Basic composition

90

670 0.0310

3.80

0.0244

620

3.70

10.0

Claims (1)

Claim Composition for producing grinding material based on sintered c0-alumina, including highly dispersed corundum-containing powder, characterized in that, in order to increase abrasive ability, it contains electrocorundum with a particle size of '0-40 μm and additionally highly dispersed alumina dust as corundum-containing powder and bentonite clay in the following ratio of components, wt.%: Fine alumina dust 40-80 Bentonite clay 9.5-10.5 Electrocorundum with particle measure 10- 40 microns Rest The content of components, _f May.% Alumina Electrocorundum Benton clay clay melting dust content weighted average size, microns 1. Density, g / cm ³ Mechanic strength, N / mm ² Abrasive ability, g Suggested composition 30,0 60.0 28 10.0 3.71 560 0,0360 40,0 50,0 28 10.0 3.79 660 0,0367 55.0 35.5 28. 9.5 3.82 705 0,0371 60.0 29.5 10 10.5 h 3.83 710 0,0354 60.0 30,0 6 10.0 3.84 720 0,0298 60.0 30,0 fifty 10.0 3.77 650 0,0394 80.0 10.0 ²⁸ 10.0 3.85 715 0,0343 85.0 5,0 28 10.0 3.80 720 0.0280 Famous composition - fifty 1,5 - 3.80 670 0,0310 50 7 Base composition 90 - - 10.0 3.70 620 0,0244