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Manufacturing method for novel nickel base solder brazing monolayer diamond grinding wheel

A single-layer diamond and diamond grinding wheel technology, which is applied in the field of single-layer superabrasive tool production, can solve the problems of affecting work efficiency, diamond graphitization, and slow wear of brazing material, so as to achieve good self-sharpening, reduce brazing temperature, The effect of reducing heat damage

Inactive Publication Date: 2013-08-07
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The brazing temperature is generally around 1050°C, and Ni in the Ni-Cr alloy is an element that promotes diamond graphitization. It has high strength and hardness, so it is easy to cause diamond graphitization, large thermal stress, and eventually lead to diamond graphitization. greater heat damage
In addition, when this type of tool cuts and grinds hard and brittle materials such as granite, stone, and ceramics, the Ni-Cr-based solder wears slowly, which makes the tool passivate, that is, poor self-sharpening, which affects work efficiency
In addition, the heating of the substrate at 1050 °C often leads to a large deformation of the substrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: A kind of manufacturing method of single-layer brazed diamond grinding wheel, utilizes the method for machining to prepare the matrix of diamond grinding wheel, degreasing and derusting to matrix. Ni-Cr-based brazing material is made of Ni-Cr-B-Si alloy, including 17 (wt)% Cr, (wt) 3.5% B, 4.0 (wt)% Si, 1 (wt)% C, and the balance is Ni. The quality of the fine Al powder added to the Ni-Cr-based solder accounts for 10% of the total mass of the solder alloy to form a composite solder. The brazing filler metal alloy was mechanically stirred for 30 minutes to mix evenly, and then the grinding wheel blank was prepared according to the sequence of grinding wheel substrate / brazing filler metal alloy / diamond abrasive grain. The diameter of the abrasive grain was 240-280 μm, and the grinding wheel substrate was 45 steel. Put the grinding wheel blank into the vacuum furnace, the heating rate is 65°C / min, and the vacuum degree is 5-8×10 -3 Pa, vacuum brazing was car...

Embodiment 2

[0013] Embodiment 2: A kind of manufacturing method of single-layer brazed diamond grinding wheel, utilizes the method for machining to prepare the matrix of diamond grinding wheel, degreasing and derusting to matrix. The Ni-Cr-based brazing material is Ni-Cr-P alloy, in which Cr 15 (wt)%, P 9.5 (wt)%, and the balance is Ni. The quality of the fine Al powder added to the Ni-Cr-based solder accounts for 12% of the total mass of the solder alloy. The brazing alloy was mechanically stirred for 30 minutes to mix evenly, and then a grinding wheel blank was prepared in the order of grinding wheel substrate / brazing alloy / diamond abrasive grain, and the grinding wheel substrate was 40Cr steel. Put the grinding wheel blank into a protective vacuum furnace with a heating rate of 65°C / min and a vacuum degree of 5-8×10 -3 Pa, vacuum brazing was carried out at 760°C for 15 minutes to make the brazing filler metal react with the diamond abrasive grains, and then cooled to room temperature ...

Embodiment 3

[0014] Embodiment 3: A kind of manufacturing method of single-layer brazed diamond grinding wheel, utilizes the method for machining to prepare the matrix of diamond grinding wheel, degreasing and derusting to matrix. Ni-Cr-based solder is Ni-Cr-B-Si alloy, in which Cr 17(wt)%, B 3.5(wt)%, Si 4.0(wt)%, C 1(wt)%, Fe 5.0(wt) %, the balance is Ni. The quality of the fine Al powder added to the Ni-Cr-based solder accounts for 12% of the total mass of the solder alloy. The brazing alloy was mechanically stirred for 20 minutes to mix evenly, and then a grinding wheel blank was prepared in the order of grinding wheel substrate / brazing alloy / diamond abrasive grains, and the grinding wheel substrate was 45 steel. Put the grinding wheel blank into the vacuum furnace, the vacuum degree is 5~8×10 -3 Pa, the heating rate is 70°C / min, vacuum brazing is carried out at 780°C for 10 minutes, so that the brazing filler metal reacts with the diamond abrasive grains, and is cooled to room tempe...

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Abstract

A manufacturing method for a brazing monolayer diamond grinding wheel comprises a first step of adopting a machining method to prepare a base body of the diamond grinding wheel and removing oil and rust of the base body; a second step of preparing Ni-Cr solder, adding Al powder into the Ni-Cr solder, mechanically evenly mixing mixture of the Ni-Cr solder and the Al powder to form solder alloy; a third step of manufacturing tool forming blank according to the sequence of the base body of the diamond grinding wheel, the solder alloy and diamond abrasive grains; a fourth step of adopting a vacuum rapid heating mode to heat the Al powder to enable the Al powder to melt, releasing massive heat due to a reaction of the melted Al and Ni to enable Ni-Cr solder to melt and undergo interface reaction with the diamond abrasive grains, and forming the monolayer diamond grinding wheel. By adding the fine Al powder into the Ni-Cr solder, brazing temperature can be reduced; under the condition that the holding force of the solder to the diamond abrasive grains is not changed, heat injury to diamond is reduced, deformation of the base body is reduced, and accordingly performance of a diamond abrasive tool can be fully performed.

Description

technical field [0001] The invention belongs to the field of making single-layer superhard abrasive tools, and is mainly aimed at the manufacturing technology of single-layer brazing diamond tools. Background technique [0002] At present, metal-based diamond tools mainly include sintering and electroplating. Sintered diamond tools are made by mixing, pressing, and sintering metal powder and diamond abrasives. There is almost no chemical metallurgical bonding at the interface between diamond abrasives and matrix materials, and the holding force of abrasives is weak; electroplated diamond tools only rely on coating machinery to embed and inlay diamond abrasives. There is little bond strength at the particle, diamond and coating interface. When these two kinds of diamond tools work under heavy loads, the diamonds often fall off prematurely due to insufficient holding force to the diamond abrasives, the effective utilization rate of the diamond abrasives is low, and the tool l...

Claims

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Application Information

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IPC IPC(8): B22F7/08
Inventor 卢金斌赵彬张旺玺穆云超刘磊丁天然
Owner ZHONGYUAN ENGINEERING COLLEGE
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