THE SPECIFICATION
Micropowders abrasive superhomogeneous with the normal and
heightened requirements to isotropic of a grain. Granularities M40-M3.
1. Under the technical conditions INOX Ltd.
(3988-003-49082222-98) industrially issued polished-powders of a granularity
M40-M3 subject to dry thin clearing of coarse and fine fractions. Thus the
heightened dimensional homogeneity of grain structures polished-powders
concerning the requirements a GOST 3647-80, FEPA and others are reached.
The preliminary ovalization polished-powders (isometrization of grains) with the
subsequent thin clearing of a content of coarse and fine fractions follow-up
increases their dimensional homogeneity (reduces dimensional dispersion of a
grain in the main fraction, increases a content of the main fraction and mean
strength of grains).
The applying of polished-powders with a heightened dimensional homogeneity,
including with preliminary isometrization of grains, allows:
* To improve the quality grindings and polishings of parts, for example, in
optical productions, and also to increase an output of suitable parts at their
formation manufacturing;
* To improve the quality and durability of an abrasive tool, made of them,
(circles, head, grinding bars etc.); to increase processing capacity by an
abrasive tool at the expense of increase of an effective surface of a contact
with a work piece.
2. Parameters of grain structures of polished-powders
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Identification of grains by GOST 3647-80, GOST 9206-80 and OST 2MT79-2-88 |
GRAIN COMPOSITION |
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FRACTIONS |
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Main |
Coarse |
Fine |
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Nominal size of a particle, mkm |
Runaway tolerance of Rated size of a grain, mkm |
Content, %, not less than |
Limit size of a grain, mkm |
Content, %, not greater than |
Limit size of a grain, mkm (more finely than) |
Content, %, not greater than |
|
| M40 (40/28) |
34 |
± 6 |
80 |
60-40 |
5 |
28 |
15 |
| M28 (28/20) |
24 |
± 4 |
80 |
40-28 |
5 |
20 |
15 |
| M20 (20/14) |
17 |
± 3 |
80 |
28-20 |
5 |
14 |
15 |
| M14 (14/10) |
12 |
± 2 |
75 |
20-14 |
5 |
10 |
20 |
| M10 (10/7) |
8 |
± 2 |
75 |
14-10 |
5 |
7 |
20 |
| M7 (7/5) |
6 |
± 1 |
75 |
10-7 |
5 |
5 |
20 |
| M5 (5/3) |
4 |
± 1 |
75 |
7-5 |
5 |
3 |
20 |
The contents of isometric grains in ovalizated structures of
polished-powders - not less than 80 %.
In view of the heightened requirements to a dimensional homogeneity of grains of
polished-powders identification of their granularities is supplemented by a word
"Super", or word "Super-oval" - for ovalizated structures of
polished-powders . The nominal size of a grain of the main fraction is adduced
with tolerance by rejections within the limits of dimensional boundaries of a
grain structure of the main fractions of polished-powders. For nominal size of a
grain the half-sum of boundary aggregate size of the main fraction is received.
3. Examples of conventional sign of polished-powders (for the booking):
* polished-powders of silicon carbide of the green mark 64C, granularity M14:
polished-powders, silicon carbide 64C M14 Super 12 (2 Specifications
3988-003-49082222-98;
* Thin polished-powders of silicon carbide of the black mark 54C, granularity
M10:
Thin polished-powders, silicon carbide 54C M10 Super 8 (2 Specifications
3988-003-49082222-98;
* polished-powders of electroemery of the white mark 25A, granularity M14:
polished-powders, electroemery white 25A M14 Super 12 (2 Specifications
3988-003-49082222-98;
* polished-powders of electroemery of the normal mark 14A, granularity M14:
polished-powders, electroemery normal 14A M14 Super 12 (2 Specifications
3988-003-49082222-98;
* polished-powders of carbide of a boron (without the mark), granularity M14:
polished-powders, carbide of a boron M14 Super 12 (2 Specifications
3988-003-49082222-98.
polished-powders, silicon carbide 64C M14 a Super-oval 12 (2 Specifications
3988-003-49082222-98.
4. The delivery is made in pressurized tare; a volume from 200 mls.
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