SU1526967A1 - Cerment binder - Google Patents

Abstract

The invention relates to the manufacture of abrasive tools on metal-ceramic bonds, in particular cutting wheels for the treatment of brittle non-metallic materials. The purpose of the invention is to ensure the manufacture of thin-walled tools by increasing the strength of raw billets and increasing the productivity of processing by increasing the strength and porosity of the tool. A bond consisting of copper and tin, taken in a 4: 1 ratio, contains, in wt.%: Low-melting glass from the group of flints 10-20

a mixture of kaolin with silicon fluoride sodium in the ratio of 1: 0.03 1-10

titanium nitride 0.05-0.1. The coefficient of thermal expansion (CTE) of glass is close to the CTE basis. 3 tab.

Description

The invention relates to the manufacture of an abrasive tool, in particular to the production of cutting wheels, and can be used in optomechanical and electronic production in the processing of magnetic heads from fragile materials, such as sendust.

The purpose of the invention is to provide for the manufacture of thin-walled tools by increasing the strength of raw billets and increasing the productivity of processing by increasing the strength and feeding of the tool.

According to the invention, the bond in the base consists of copper and tin, taken in the corresponding 4: 1, and contains, in wt.%: Low-melting glass from the group of flints 10–20; a mixture of kaolin with sodium silicofluoride (1: 0.03) 1-10; titanium nitride 0.05-0.1.

The fusible glass of the flint group consists of the following components:

5.02 31.6-47

, 85-6,35

LL-.0 PJO

0.2 - 0.25 65.3-36.4

The coefficient of thermal expansion (CTE) of the glass is close to the CTE of the Ml binder (copper with tin m in the ratio 4: 1), which leads to the strengthening of the binder. The mixture of kaolin with silicon fluoride. Sodium is incorporated into the bond as a component that promotes the adhesive interaction of the components of the binder during sintering due to the introduction of silicon fluoride sodium and, in addition, it contributes to the pore formation of the binder due to the fact that the sintering loses crystallization of the kaolin water entering into its composition (up to 14% by mass, which amounts to 40% by volume of pores). The resulting porous bond has a good heat sink due to the metal bond base, and also due to the pores, the coolant supply to the cutting zone and removal of cutting products from the zone is improved. Zorista linkage is not salted. The use of titanium nitride (in the form of a powder in conjunction with or in

with:

WITH

but

Coatings on CBN grains) helps to reduce friction in the processing zone, which reduces cutting effort, increases the adhesion of cutting grains to the binding.

The use of the proposed binder composition results in durable billets — briquettes after pressing, which does not require an additional hot pressing operation after sintering.%: It allows sintering of briquettes in a free state. Improvement briquettiro - Fusible glass from group

possessing high production at metal processing, in private processing of expensive difficult material sendust, at electronic industry in nah.

The optimal correlation of the bond corresponds to the following

flints

A mixture of kaolin and sodium silicofluoride (1: 0.03) Titanium nitride

Waii is caused by the introduction of kaolin and sodium fluoride. Kaolin is a fine white clay composition, wt.%: S / Os 50-75; / l / aOj 17 -

34; Re-20l 0.2-2.5; TiO-2 0.2-2.0; CaO 0.1 - 15 Copper with tin 4: 1) 1.0; MgO 0.1-0.5; 0.3-8.5; L a2O 0.1-1.0.

Example. Binding components: Ml bond (copper with tin in the ratio 4: 1), fusible slime glass from the group of flints (TF7, F9, LF9, TFZ - TFU glass both in a mixture and in the form of a powder of the same brand), a mixture kaolin with silicon fluoride sodium in a ratio (1: 0.03) is mixed with powder of cubic boron nitride

15

five

0.07 79.93

A glass content of less than 10%, a mixture of kaolin with sodium silicon fluoride less than 1% and titanium nitride less than 0.05% does not improve the properties of the tool and does not allow the use of high-speed modes due to the clogging of the tool and an increase in cutting forces. Excessive content in conjunction of glass and a mixture of kaolin with sodium fluoride fluoride. This leads to an increase in cutting forces due to the coating of titanium nitride and the method of 25 chips on the treated surface.

powder metallurgy pressed and baked

cut-off wheels of type OK 100x0.6x5x20 КР 100 (80 M (Tj-) - 500/0. One time and: 5) make circles with CBN without ikryti, and

titanium nitride powder is administered nep 30

40

part of the mixture. The obtained cutting wheels are sintered at 720 ° C for 20 minutes in a protective medium (hydrogen or CO). Hot pressing is not available. At the same time make the cutting wheel iz-. known composition. The control of the processability of briquetting and sintering is carried out. 35

The results are summarized in table. one.

Due to the introduction of a compound based on copper and tin in a 4: 1 ratio of low-melting glass from the group of flints and a mixture of kaolin and sodium fluoride in a ratio of 1: 0.03, the ductility of the binder is increased, which makes it possible to produce thin-walled briquettes for cutting wheels of relatively large diameters (0100 mm), dense after briquetting, which can be sintered in a free state without additional hot repressing.

The tools obtained were tested for cutting operations of the sendust material on a SAFAG machine under the following conditions: n 8000 rpm; depth of cut 2.5 mm; Coolant - flowing water; feed rate up to 22 mm / min.

The test results are summarized in table. 2

The use of a mixture of flint glasses or one of the brands of such glasses practically does not change the test results. 55

The results of the comparative tests show that the proposed binder composition makes it possible to obtain a cutting tool,

45

50

In the proposed composition, a mixture of kaolin and sodium krenium fluoride is proposed in a ratio of 1: 0.03. This ratio is optimal, since with a lower content of sodium silicofluoride the effect of pore formation and adhesive interaction of the binder is insignificant due to uneven distribution. VaaSjfe in the composition (small amount), and a higher content does not lead to a significant improvement in the binder after sintering.

The results of comparative tests are given in table. 3

The use of the proposed metal-ceramic binder makes it possible to increase the productivity of processing and the yield of usable briquetting products.

Claims (1)

Invention Formula Metal-ceramic bond for abrasive tools, containing copper, tin, glass and filler, characterized in that, in order to ensure the manufacture of thin-walled tools by increasing the strength of the raw billet and increasing the productivity of processing by increasing the strength and porosity of the tool, the link further contains kaolin mixture with sodium silicon fluoride in a ratio of 1: 0.03, copper and tin are introduced in a ratio of 4: 1, and low-melting glass from the group of flints is introduced as glass, as fill l - titanium nitride in the following ratio, wt.%: wt.%: Fusible glass from the group It possesses high productivity in metal processing, in particular, in the processing of expensive difficult-to-process sendust material used in the electronic industry in tape recorders. The optimum ratio of binder components corresponds to the following composition, wt.%: Fusible glass from groups flints A mixture of kaolin and sodium silicofluoride (1: 0.03) Titanium nitride Copper with tin 4: 1) Copper with tin 4: 1) A glass content of less than 10%, a mixture of kaolin with sodium silicon fluoride less than 1% and titanium nitride less than 0.05% does not improve the properties of the tool and does not allow the use of high-speed modes due to the clogging of the tool and an increase in cutting forces. Excessive content in conjunction with glass and a mixture of kaolin and sodium fluoride fluoride. This leads to an increase in cutting forces and 0 five five five 0 In the proposed composition, a mixture of kaolin and sodium krenium fluoride is proposed in a ratio of 1: 0.03. This ratio is optimal, since with a lower content of sodium silicofluoride the effect of pore formation and adhesive interaction of the binder is insignificant due to uneven distribution. VaaSjfe in the composition (small amount), and a higher content does not lead to a significant improvement in the binder after sintering. The results of comparative tests are given in table. 3 The use of the proposed metal-ceramic binder makes it possible to increase the productivity of processing and the yield of usable briquetting products. Invention Formula Metal-ceramic bond for abrasive tools, containing copper, tin, glass and filler, characterized in that, in order to ensure the manufacture of thin-walled tools by increasing the strength of the raw billet and increasing the productivity of processing by increasing the strength and porosity of the tool, the link further contains kaolin mixture with sodium silicon fluoride in a ratio of 1: 0.03, copper and tin are introduced in a ratio of 4: 1, and low-melting glass from the group of flints is introduced as glass, as fill l - titanium nitride in the following ratio, wt.%: Fusible glass from the group flints A mixture of kaolium with sodium cremium fluoride in the ratio 1 - 10 0.05-0.1 Else Table 1 Matching Briquetting Sintering Known weakness of adherence tone. Requires mountains - bone briquettes. 30% cha dopressovka has cracks and shots Offered- High density fine- Free special canne briquettes table 2 Composition Glass Mixture Nitrite Copper with Critical- Note of cadaver-capitol of stitan, tin priests flin-NaiSiFg, May. % (4: 1), cottage, tone, wt.% May. % mm / min May.% Known-10 When using intensive cutting modes processing material is destroyed edit one 2 3 4 5 10 15 20 22 18 ten 10 5 1 2 0.8 0.1 0.1 0.07 0.05 0.07 81.9 79.9 79.93 78.95 75.95 0.07 81.13 12 18 18 20 20 10 10 12 2 2 8.93 7.9 2.9 1.0 0.07 0.03 0.12 0.07 0.1 0.1 0.1 A further increase in feed is limited by the ability of the machine. 12 18 20 18 15 ten 19 12 12 15 20 18 18 Tool greasing Optimal composition Increase cutting forces Tool salinization due to poorly porous salinization Is weak closed CBN Tool salinization