CZ20032369A3 - Material for producing extremely porous grinding tools - Google Patents

Abstract

Highly porous grinding tool for machining structural steels and alloys. The mass of their production contains abrasive grain, ceramic binder and filler, which are hollow spherical aluminosilicate particles mixed with wax and wax similar materials. In addition, the mass can additionally contain hollow spherical particles of refractory as filler corundum, light-melting glass or baking filler, or may be a combination of said fillers.

Description

Material for production of highly porous grinding tools

Technical field

The invention solves a mass for the production of highly porous ceramic bonding abrasive tools.

BACKGROUND OF THE INVENTION

A material for producing highly porous abrasive tools is already known which contains a refractory filler of hollow spherical corundum particles. The size of the spherical particles is 0.45-0.65 compared to the abrasive grain size, at 30-37% by volume (SU author's certificate 1073082, class B 24D 3 / 14,1984) [1],

The main drawback of the abrasive tools produced according to the above-mentioned composition [1] is that the increased porosity increases the refractory spherical filler content, causing a decrease in the hardness of the abrasive tools. As a result, tool wear increases in machining modes where their working load is higher. To increase the porosity of the abrasive tools, it is possible to add lightly fusible thin-walled spherical particles of glass to the abrasive at an amount of 0.1-0.5 as compared to the abrasive grains at a content of 32-48% by volume. (SU author's certificate 17633160, class B 24D 3 / 14,1993) [2], In the implementation of the second proposal [2], the ceramic binder is reinforced in the tools (glass spherical particles turn into a ceramic binder when fired abrasive tools). The filler content makes the binders less abrasive due to the brittleness.

Abrasive wheels are also known in which increased porosity is ensured by the addition of organic and inorganic fillers to the molding composition which burns on firing. (POPOV SA and others Grinding with highly porous wheels. M .: Mechanical Engineering, 1980.C 8- [3], The disadvantages of these wheels are reduced grinding productivity due to low tool quality. The disadvantage is also instability of tool hardness, high imbalance and low resistance to grinding. tear.

There is also known an abrasive composition which comprises an abrasive grain and a ceramic binder to which a filler is added - hollow spherical aluminosilicate particles. In addition, the composition may additionally contain as filler hollow spherical corundum particles or a light-melting glass or filler that burns during firing (for example naphthalene, fruit stones), or a combination of said fillers of two, three or four types (RU patent 2152298 C1, class 7B 24 D 3/18, 3/34) [4],

-2 ·· ·· • · ·

9 9 · • · · ··· *

A disadvantage of this composition [4] and all of the abovementioned abrasive compositions [1, 2, 3] is that it is not possible to produce highly porous grinding wheels of large dimensions (these are porosity structures No. 10-20 and above) . This is due to the low mechanical strength of the wheels during and after compression, and the susceptibility of disruption of the disks, and firing at high temperatures due to high shrinkage, where the susceptibility to tool disruption still increases. In addition, the structure is formed 2-3 numbers lower than originally requested.

SUMMARY OF THE INVENTION

The aforementioned disadvantages are overcome by the mass for the production of highly porous abrasive tools comprising abrasive grains, ceramic binder and filler according to the invention, which is characterized in that hollow spherical aluminosilicate particles in the form of a mixture of particles of 5 to 560 µm size are used as filler. The content of these particles is 2 to 200% by volume of abrasive grain in combination with a wax or wax-like material in the form of a mixture of hard particles of 0.5-2 mm in size containing 1 to 500% by volume of hollow spherical aluminosilicate particles. Further, the filler is added in the form of refractory corundum hollow spherical particles having a content of 5 to 100% by volume of aluminosilicate filler. A filler in the form of hollow spherical particles of light-melting glass containing 5 to 100% by volume of aluminosilicate filler may also be added, or a mixture of two fillers may be added in the form of refractory corundum hollow spherical particles and hollow spherical particles of light-melting glass. the total content is 5 to 100 volume% aluminosilicate filler. A baking filler containing 5 to 250% by volume aluminosilicate filler may be added or a mixture of two fillers in the form of refractory corundum hollow spherical particles and baking filler having a total content of 5 to 250% by volume aluminosilicate filler. Another is the addition of a mixture of two fillers in the form of hollow spherical particles of light-melting glass and a baking filler having a total content of 5 to 250% by volume of aluminosilicate filler or the addition of a mixture of three fillers in the form of hollow spherical particles of light-melting glass, refractory corundum hollow spherical particles and a baking filler having a total content of 5 to 250% by volume of aluminosilicate filler.

The wax or wax materials are initially in the form of a mixture of hard particles and, together with aluminosilicate hollow spherical particles, contribute to the formation of the abrasive mass, improving its miscibility and mechanical strength. When pressing the tool, the wax particles are or

Analogous particles in the form of a dry lubricant and a damping interlayer between mixing abrasive components, especially abrasive grains and sharp edges of aluminosilicate hollow spherical particles.

In the firing process at high abrasive temperature, the wax or waxy materials in the liquid state (already at a temperature of 45 to 130 ° C depending on the composition) increase in volume by 15 to 20% and thus provide back pressure created within the bulk structure of the abrasive tools. This back pressure prevents the abrasive grains from contracting into a denser bulk structure due to the gradual melting and subsequent hardening of the ceramic bond in the firing process.

The technical result is the possibility of producing large diameter grinding wheels - 500600 mm or more with a height of 80-200 mm with a porosity structure of 10-20 or more while achieving higher strength of the abrasive mass and its minimal deformation during firing. In addition, hollow spherical corundum or light-melting glass particles or a filler that burns at the firing temperature (eg naphthaline or fruit stones) or a combination of the two, three or four types of fillers mentioned above may also be added to the abrasive. Additions of supplementary binders together with aluminosilicate hollow spherical particles improve the technical parameters of the abrasive (for example, reducing the volume deformation of the tool during firing), increase the homogeneity of the physico-mechanical properties of the total tool volume and its market strength.

The technical results of introducing the use of supplementary fillers in combination with aluminosilicate hollow spherical particles in a mixture with hard wax particles or waxy materials provide improved technological properties of highly porous abrasives (miscibility, strength, uniform distribution of particles in the abrasive, reduction of firing deformation) Highly porous abrasive tool (increased productivity using higher grain size and increased working speed).

DETAILED DESCRIPTION OF THE INVENTION

Examples of possible uses of aluminosilicate hollow spherical particles in admixture with hard particles of wax or wax materials together with filler are given below.

Example 1

Abrasive material for the production of A99B white corundum grinding wheel, grain size 80, structure no. 6 consists of the following materials - in% by volume: abrasive grain - 50%

-4Ceramic binder - 8% aluminosilicate hollow spherical particles (filler) -1% wax - 5% natural pores - rest • · · · ·· ·· • ··· «··· 9

9 ······· · · ····· · · ··· 9

The amount of aluminosilicate hollow spherical particles (in the filler) is 2% of the total abrasive volume content and the amount of wax used is 500% of the volume of aluminosilicate hollow spherical particles.

Example 2

Abrasive material for the production of A99B white corundum grinding wheel, grain size 80, structure No. 14 consists of the following materials - stated in% by volume:

abrasive grain - 34% ceramic binder -16% aluminosilicate hollow spherical particles (filler) -18% wax - 7% natural pores - rest

The amount of aluminosilicate hollow spherical particles (in the filler) is 52.9% of the total volume of abrasive and the amount of paraffin used is 38.9% of the volume of aluminosilicate hollow spherical particles of the filler.

Example 3

Abrasive material for the production of A99B white corundum grinding wheel, grain size 80, structure No. 21 consists of the following materials - stated in% by volume:

abrasive grain - 20% ceramic binder - 12% aluminosilicate hollow spherical particles (filler) - 40% wax - 0.4% natural pores - rest

The amount of aluminosilicate hollow spherical particles (in the filler) is 200% of the total abrasive volume content and the amount of wax used is 1% of the volume of aluminosilicate hollow spherical filler particles.

-599 · 99 · 9 9 9 9 9 9 9 999999 9

999 99 9,999

99 99 99 99

Example. 4

Abrasive compound for the production of A99B battered corundum grinding wheel, Grit 100, Structure No. 16 consists of the following materials -% by volume: abrasive zmo - 30% ceramic binder -10% clay-silicon hollow spherical particles (filler) - 24% cerezine - 10% corundum refractory hollow spherical particles (filler) -1,2% natural pores - rest

The amount of aluminosilicate hollow spherical particles (in the filler) amounts to 80% of the total abrasive content, the amount of cerizine used is 41.7% of the volume of aluminosilicate hollow spherical filler particles, and the corundum refractory hollow spherical particles (filler) is 5% aluminosilicate hollow spherical filler particles.

Example 5

A99B white corundum grinding wheel, grain size 100, structure no.16 consists of the following materials -% by volume: abrasive zmo - 30% ceramic binder -10% aluminosilicate hollow spherical particles (filler) -18% wax - 6% corundum refractory hollow spherical particles (filler) - 9% natural pores - rest

The amount of aluminosilicate hollow spherical particles (in the filler) is 60% of the total abrasive volume content, the amount of wax used is 33.3% of the volume of aluminosilicate hollow spherical filler particles, the amount of corundum hollow spherical particles (filler) is 50% of the volume. the amount of aluminosilicate hollow spherical filler particles.

Example 6

Abrasive for the production of A99B white corundum grinding wheel, Grit 100, Structure No. 16 consists of the following materials -% by volume: Abrasive - 30% • 4444 • * w ·

4 4 4

4 4 ·

4 4 4 4

-6ceramic binder - 10% aluminosilicate hollow spherical particles (filler) -12% wax - 8% corundum refractory hollow spherical particles (filler) - 12% natural pores - rest

The amount of aluminosilicate hollow spherical particles (in the filler) amounts to 40% of the total abrasive content, the amount of wax used is 66.7% of the volume of aluminosilicate hollow spherical filler particles, the amount of corundum hollow spherical particles (filler) is 100% aluminosilicate hollow spherical filler particles.

Example 7

Abrasive for the production of A99B white corundum grinding wheel, grain size 80, structure no.10 consists of the following materials - stated by volume: abrasive grain - 42% ceramic binder - 8% aluminosilicate hollow spherical particles (filler) - 16% wax - 5% corundum refractory hollow spherical particles (filler) -0,8% natural pores - rest

The amount of aluminosilicate hollow spherical particles (in the filler) amounts to 38.1% of the total abrasive volume content, the amount of wax used is 31.2% of the volume of aluminosilicate hollow spherical filler particles, the amount of corundum hollow spherical particles (filler) is 5% by volume of aluminosilicate hollow spherical filler particles.

Example 8

Abrasive material for the production of A99B white corundum grinding wheel, grain size 80, structure no.10 consists of the following materials - stated in% by volume:

abrasive grain - 42% ceramic binder - 8% aluminosilicate hollow spherical particles (filler) -12% galovax - 3% hollow spherical particles with easily melting glass (filler) - 4,8%

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The amount of aluminosilicate hollow spherical particles (in the filler) amounts to 28.6% of the total volume of abrasive, the amount of galovax used is 25% of the volume of aluminosilicate hollow spherical particles of filler, the amount of hollow spherical particles of light melting glass (filler) is 40% the amount of aluminosilicate hollow spherical filler particles.

Example 9

Abrasive material for the production of A99B white corundum grinding wheel, grain size 80, structure no.10 consists of the following materials - stated in% by volume:

abrasive grain - 42% ceramic binder - 8% aluminosilicate hollow spherical particles (filler) - 6% wax - 6% hollow spherical particles with easily melting glass (filler) - 6% natural pores - rest

The amount of aluminosilicate hollow spherical particles (in the filler) is 14.3% of the total volume of abrasive, and the amount of wax used is 100% of the volume of aluminosilicate hollow spherical particles of filler, the amount of hollow spherical particles with light melting glass (filler) is 100% % by volume of aluminosilicate hollow spherical filler particles.

Example 10

Abrasive material for the production of A99B white corundum grinding wheel, grain size 100, structure no.15 consists of the following materials - stated in% by volume:

abrasive grain - 32% ceramic binder -10% aluminosilicate hollow spherical particles (filler) - 28% wax - 2.8% corundum refractory hollow spherical particles (filler) - 1.0% hollow spherical particles with light melting glass (filler) - 0.4% natural pores - rest

The amount of aluminosilicate hollow spherical particles (in the filler) is 87.5% of the total abrasive content, the amount of wax used is 10% of the volume.

-844 4444 * 4 4 4 4 4 4 44 4

4 44 · 4 · 4 · 4 · 4 · 4

4444 44 4 · 444 ·· ·· ·· 44 44 44 Aluminosilicate hollow spherical filler particles, the total amount of corundum refractory hollow spherical particles and hollow spherical particles with low melting glass is 5% by volume of aluminosilicate hollow spherical filler particles.

Example 11

A99B white corundum grinding wheel, grain size 100, structure no. 15 consists of the following materials -% by volume: abrasive grain - 32% barium binder -10% aluminosilicate hollow spherical particles (filler) - 22% wax - 4.5% corundum refractory hollow spherical particles (filler) - 8.0% hollow spherical particles with easily melting glass (filler) - 1.6% natural pores - rest

The amount of aluminosilicate hollow spherical particles (in the filler) amounts to 68.75% of the total abrasive volume content, the amount of wax used is 20.4% of the volume of aluminosilicate hollow spherical filler particles, the total amount of corundum hollow spherical particles and lightly hollow spherical particles. the melt glass is 43% by volume of the aluminosilicate hollow spherical filler particles.

Example 12

Abrasive material for the production of A99B white corundum grinding wheel, grain size 100, structure no.15 consists of the following materials - stated in% by volume:

abrasive grain - 32% ceramic binder -10% aluminosilicate hollow spherical particles (filler) -14% wax - 9% corundum refractory hollow spherical particles (filler) -10% hollow spherical particles with light-melting glass (filler) - 4% natural pores - the rest

The amount of aluminosilicate hollow spherical particles (in the filler) is 43.75% of the total abrasive content and the amount of wax used is 64.3% of the volume of aluminosilicate hollow spherical fillers, total • 9 9999

9 · 9 ·

99 • 9 9 9 9 9 9

9,999 »99 9

9,999,99999 9 9 _ 999999 99999

99 99 99 9 · 99 the quantity of corundum refractory hollow spherical particles and hollow spherical particles with an easily melting glass is 100% by volume of aluminosilicate hollow spherical filler particles.

Example 13

Abrasive material for the production of A99B white corundum grinding wheel, grain size 100, structure no.16 consists of the following materials - stated in% by volume:

abrasive grain - 30% ceramic binder - 9% aluminosilicate hollow spherical particles (filler) - 28% wax - 7.5% filler that burns on firing (fruit stones) - 1.6% natural pores - rest

The amount of aluminosilicate hollow spherical particles (in the filler) amounts to 93.3% of the total abrasive volume content, the amount of wax used is 26.8% of the volume of aluminosilicate hollow spherical filler particles, the amount of filler that burns on firing (fruit stones) 5% by volume of aluminosilicate hollow spherical filler particles.

Example 14

Abrasive material for the production of C48 black silicon carbide grinding wheel, grain size 100, structure no.12 consists of the following materials - stated by volume:

abrasive grain - 38% ceramic binder -11% aluminosilicate hollow spherical particles (filler) - 8% oleovax - 4% filler that burns on firing (fruit stones) - 13% natural pores - rest

The amount of aluminosilicate hollow spherical particles (in the filler) is 21% of the total abrasive volume content, the amount of oleovax used is 50% of the volume of aluminosilicate hollow spherical filler particles, and the amount of filler that burns on firing (fruit stones) is 162.5%. by volume of aluminosilicate hollow spherical filler particles.

• 4,444

- 105 4 4

4 4

4 4 •

4 4 4

94

4 4 4

4 4 4

4 44 4

4 4

4 4 4

4444

4 4

4 4

4 4

4 4 4

4 4 4

Example 15

Abrasive material for the production of C49 black silicon carbide grinding wheel, grain size 100, structure no. 12 consists of the following materials -% by volume:

abrasive grain - 38% ceramic binder -11% aluminosilicate hollow spherical particles (filler) - 6% wax - 8% filler that burns on firing (fruit stones) - 15% natural pores - rest

The amount of aluminosilicate hollow spherical particles (in the filler) is 15.8% of the total abrasive content, the amount of wax used is 133.3% of the volume of aluminosilicate hollow spherical filler particles and the amount of filler that burns on firing (fruit stones) is 25 % by volume of aluminosilicate hollow spherical filler particles.

Example 16

Abrasive material for the production of A99B white corundum grinding wheel, grain size 100, structure No 18. consists of the following materials, expressed in% by volume:

abrasive grain - 20% ceramic binder -10% aluminosilicate hollow spherical particles (filler) - 30% wax -10% corundum refractory hollow spherical particles (filler) -0,5% filler that burns on firing (fruit stones) -1% natural pores - the rest

The amount of aluminosilicate hollow spherical particles (in the filler) amounts to 115.4% of the total abrasive volume content, the amount of wax used is 53.3% of the volume of aluminosilicate hollow spherical filler particles, and the total amount of corundum hollow spherical particles and filler firing (fruit stones) is 5% by volume of aluminosilicate hollow spherical filler particles.

• tt tttttttt • tt tttttttt • tt tttt • tt · tttttttt tttt tt • tttt ······· tttt tttttttt tttttt tttttt · • tttttt tttt tt ···· tttt ·· tttt tttt tt · ··

Example 17

Abrasive material for the production of A99B white corundum grinding wheel, grain size 100, structure No. 18 consists of the following materials - stated in% by volume:

abrasive grain - 26% ceramic binder -10% aluminosilicate hollow spherical particles (filler) - 20% wax - 8.5% corundum refractory hollow spherical particles (filler) - 10% filler that burns on firing (fruit stones) -10% natural pores - the rest

The amount of aluminosilicate hollow spherical particles (in the filler) amounts to 76.9% of the total abrasive volume content, the amount of wax used is 42.5% of the volume of aluminosilicate hollow spherical filler particles, the total amount of corundum hollow spherical particles and filler firing (fruit stones) amounts to 100% by volume of aluminosilicate hollow spherical filler particles.

Example 18

Abrasive material for the production of A96 brown corundum grinding wheel, grain size 100, structure no.16 consists of the following materials - stated in% by volume:

abrasive grain - 30% ceramic binder -13% aluminosilicate hollow spherical particles (filler) - 6% wax - 15% corundum refractory hollow spherical particles (filler) - 9% filler that burns on firing (fruit stones) - 6% natural pores - residue

The amount of aluminosilicate hollow spherical particles (in the filler) is 20% of the total abrasive volume content, the amount of wax used is 250% of the volume of aluminosilicate hollow spherical filler particles, the total amount of corundum refractory hollow spherical particles and fillers that burn out ) is 250% by volume of aluminosilicate hollow spherical filler particles.

4 «44 ·· • · · 4

- 12 • 4 44

4 · 4 4 4 44

4,444 44 4 • 4 4 4 4 «444 444 4

4444 44 4 4444

44 44 44 44

Example 19

Abrasive material for the production of A99B white corundum grinding wheel, grain size 100, structure No. 18 consists of the following materials - stated in% by volume:

abrasive grain - 26% ceramic binder -12% aluminosilicate hollow spherical particles (filler) - 30% wax - 32% hollow spherical particles of light-melting glass (filler) - 0.5% filler that burns on firing (fruit stones) - 1.0% natural pores - rest

The amount of aluminosilicate hollow spherical particles (in the filler) amounts to 115.4% of the total abrasive content, the amount of wax used is 106.7% of the volume of aluminosilicate hollow spherical particles of filler, the total amount of hollow spherical particles of light-melting glass (filler) and the fillers which burn on firing (fruit stones) are 5% by volume of the aluminosilicate hollow spherical filler particles.

Example 20

Abrasive material for the production of grinding wheel from a mixture of grain, grain size 80, structure no.16 consists of the following materials - stated in% by volume:

abrasive grain - white corundum A99B - 21% abrasive grain - microcrystalline corundum brand SG - 9% ceramic binder - 7% aluminosilicate hollow spherical particles (filler) -18% wax - 22% hollow spherical particles of easily melting glass (filler) - 3 % filler that burns on firing (fruit stones) - 6% natural pores - rest

The amount of aluminosilicate hollow spherical particles (in the filler) is 60% of the total volume of abrasive, the amount of wax used is 122.2% of the volume of aluminosilicate hollow spherical particles of filler, the total amount of hollow spherical particles of light-melting glass (filler) and filler, which burn on burning (fruit stones) is 50% by volume of aluminosilicate hollow spherical filler particles.

-13 ·· · «« «94 ·· · ♦ ···· · · · · · 9 · · · ·

4 4 4 4 4 4 9 4 9

4 4 4 4 499 945 4

4 9 4 9 4

44 44 44 44

Example 21

Abrasive material for the production of A99B battered corundum grinding wheel, grain size 100, structure no. 18, consists of the following materials, expressed in% by volume:

abrasive grain - 26% ceramic binder -10% aluminosilicate hollow spherical particles (filler) -10% wax - 5.5% hollow spherical particles of easily melting glass (filler) - 5% filler that burns on firing (fruit stones) - 20 % natural pores - rest

The amount of aluminosilicate hollow spherical particles (in the filler) amounts to 38.5% of the total abrasive content, the amount of wax used is 55% of the volume of aluminosilicate hollow spherical particles of filler, the total amount of hollow spherical particles of light-melting glass (filler) and filler which burn on burning (fruit stones) is 250% by volume of aluminosilicate hollow spherical filler particles.

Example 22

Abrasive material for the production of A99B white corundum grinding wheel, grain size 80, structure No.21 consists of the following materials - stated in% by volume:

abrasive grain - 20% ceramic binder -10% aluminosilicate hollow spherical particles (filler) - 40% wax - 2% corundum refractory hollow spherical particles (filler) - 0.5% hollow spherical particles of light-melting glass (filler) - 0, 5% filler that burns on firing (fruit stones) - 1.0% natural pores - the rest

The amount of aluminosilicate hollow spherical particles (in the filler) is 200% of the total abrasive volume content, the amount of wax used is 5% of the volume of aluminosilicate hollow spherical filler particles, the total amount of corundum hollow spherical spherical particles (filler), hollow spherical spherical particles the glass (filler) and the filler that burns on firing (fruit stones) are 5% by volume of aluminosilicate hollow spherical filler particles.

9999

9 9

9 9

9 4 9

9 9 ·

99

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9 9 9

9 9 ·

4 444

4 4

44

4494

9 4

4 4

4 4 4

9 9 4

44

Example 23

Abrasive material for the production of A99B white corundum grinding wheel, grain size 80, structure No.21 consists of the following materials - stated in% by volume:

abrasive zmo - 20% ceramic binder - 9% aluminosilicate hollow spherical particles (filler) - 20% wax - 8% corundum refractory hollow spherical particles (filler) - 5% hollow spherical particles of easily melting glass (filler) - 5% filler which burns out at firing (fruit stones) - 10% natural pores - the rest

The amount of aluminosilicate hollow spherical particles (in the filler) is 100% of the total abrasive volume content, the amount of wax used is 40% of the volume of aluminosilicate hollow spherical filler particles, the total amount of corundum hollow spherical spherical particles (filler), hollow spherical spherical particles glass (filler) and filler that burns on firing (fruit stones) is 100% by volume of aluminosilicate hollow spherical filler particles.

Example 24

Abrasive material for the production of white corundum grinding wheel mark A99B grain size 80 from structure 21 consists of the following materials - stated in% by volume:

abrasive zmo - 20% ceramic binder - 9% hollow aluminosilicate spherical particles (filler) - 12% wax - 7% corundum refractory spherical particles (filler) - 7% hollow glass spherical particles slightly fusible (filler) - 3% filler that burns (fruit stones) - 20% natural pores - rest

The amount of hollow aluminosilicate spherical particles (filler) is 60% by volume of the abrasive content and the amount of wax is 58.3% by volume of the aluminosilicate filler. The total amount of corundum refractory hollow spherical particles (filler), hollow vitreous spherical particles readily detectable (filler), and filler that burns (fruit stones) is 250% of the volume of the clay-siliceous filler content.

·· · ♦ ··

9999

- 1592 99

9 9 9 9 9

11 9 111111

9,111 1,111 1 1 1 1

1111 11 1111 11 11 11 19 91 11

The additional addition of hollow corundum spherical particles and easily meltable glass separately or in mixtures thereof of two or three kinds to an abrasive material containing hollow aluminosilicate spherical particles mixed with hard wax particles or wax-like materials and a filler that burns allows to set technological properties highly porous grinding tools in a wide range with respect to the different value of each component.

When determining the abrasive composition, which is combined with the type and amount of filler, abrasive grain and ceramic binder, it should be remembered that the total volume composition of all components, including fillers, water and natural pores, must match the volume of the abrasive for the tool.

For the experimental control of the proposed technical solutions, highly porous large-size disks were produced in accordance with the above examples.

Table 1 shows the dimensions of flat grinding wheels of white corundum and silicon carbide of different grain and hardness, with a structure number of 10-21 (in accordance with the abrasive grain content in the tool volume from 42 to 20%) for which the volume deformation was measured after firing. The volume deformation of the grinding wheels was determined by the difference in the volume of the wheels into and after firing. In all the examples, the volume did not exceed 7% deformation. Table 1

Dimensions and quality of highly porous grinding wheels

Grinding wheel size Quality Volume deformation during firing in percent 500x80x203,2 A99B 100H 16V 3.2 500x100x203,2 A99B 80G 14V 4.1 600x80x203,2 A99B 80K 14V 3.8 500x130x203,2 A99B 100H 16V 6.0 610x145x203,2 48C 100H12V 6.4 500x175x203,2 49C 100G12V 6.9 600x20x203,2 A99B 80G 16V 6.1 600x200x203,2 A99B 100G15V 2.8 450x150x127 A99B 80K 10V 2.6 500x130x203,2 A99B 100J 18V 6.3 450x200x127 A99B 80121V 7.0

The abovementioned quality of the abrasive material object of the invention ensures not only the production of large-sized tools, but also high technological properties.

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PATENT CLAIMS

Claims (8)

PATENT CLAIMS Material for the production of highly porous abrasive tools, comprising abrasive grains, a ceramic binder and a filler, characterized in that hollow spherical aluminosilicate particles in the form of a mixture of particles having a particle size of 5 to 560 µm and having a content of 2 to 200 % by volume of abrasive grain in combination with a wax or wax-like material in the form of a mixture of hard particles of 0.5-2 mm in size containing 1 to 500% by volume of hollow spherical aluminosilicate particles. A composition according to claim (1), characterized in that the filler is added in the form of refractory corundum hollow spherical particles having a content of 5 to 100% by volume of aluminosilicate filler. A composition according to claim 1, characterized in that a filler in the form of hollow spherical particles of light-melting glass having a content of 5 to 100% by volume of aluminosilicate filler is added. Compound according to claim 1, characterized in that a mixture of two fillers is added in the form of refractory corundum hollow spherical particles and hollow spherical particles of light-melting glass having a total content of 5 to 100% by volume of aluminosilicate filler. Compound according to claim 1, characterized in that a filler in the form of a baking filler is added, the content of which is 5 to 250% by volume of an aluminosilicate filler. A composition according to claim 1, characterized in that a mixture of two fillers is added in the form of refractory corundum hollow spherical particles and a baking filler having a total content of 5 to 250% by volume of aluminosilicate filler. 44 4444 -17 * 4 4 4 4 4 · «4 4 44 44 • 4 4 • * • 4 • 4 • 4 444 44 444 » 4 4 4 4 4 · 4 · 4 4 44 44 Compound according to claim 1, characterized in that a mixture of two fillers in the form of hollow spherical particles of light-melting glass and a baking filler is added, the total content of which is 5 to 250% by volume of aluminosilicate filler. A composition according to claim (1), characterized in that a mixture of three fillers is added in the form of hollow spherical particles of light-melting glass, refractory corundum hollow spherical particles and a baking filler having a total content of 5 to 250% by volume aluminosilicate filler .