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 t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0011] Example 1: A method for manufacturing a single-layer brazed diamond grinding wheel, which uses a machining method to prepare the matrix of the diamond grinding wheel to remove oil and rust from the matrix. Ni-Cr-based solder is Ni-Cr-B-Si alloy, of which 17 (wt)% Cr, (wt) 3.5% B, 4.0 (wt)% Si, 1 (wt)% C, and the balance is Ni. The mass of the fine Al powder added to the Ni-Cr-based brazing filler metal accounts for 10% of the total mass of the brazing filler metal alloy to form a composite brazing filler metal. The brazing alloy is mechanically stirred for 30 minutes and mixed uniformly, and then the grinding wheel blank is prepared in the order of the grinding wheel matrix / borer alloy / diamond abrasive grains. The diameter of the abrasive grains is 240~280μm, and the grinding wheel matrix is ​​45 steel. Put the grinding wheel blank into the vacuum furnace, the heating speed is 65℃ / min, the vacuum degree is 5~8×10 -3 Pa, vacuum brazing is performed under a process of hold...

Example Embodiment

[0013] Embodiment 2: A manufacturing method of a single-layer brazed diamond grinding wheel, the matrix of the diamond grinding wheel is prepared by a machining method, and the matrix is ​​degreasing and derusting. Ni-Cr-based solder is Ni-Cr-P alloy, of which Cr 15 (wt)%, P 9.5 (wt)%, and the balance is Ni. The mass of the fine Al powder added to the Ni-Cr-based solder accounts for 12% of the total mass of the solder alloy. The solder alloy is mechanically stirred for 30 minutes and mixed uniformly, and then the grinding wheel blank is prepared in the order of the grinding wheel matrix / the solder alloy / diamond grit. The grinding wheel matrix is ​​40Cr steel. Put the grinding wheel blank into the protection vacuum furnace, the heating rate is 65℃ / min, the vacuum degree is 5~8×10 -3 Pa, vacuum brazing is carried out under a process of holding at 760°C for 15 minutes to cause the brazing alloy to react with diamond abrasive grains, and then cooling to room temperature with the fu...

Example Embodiment

[0014] Embodiment 3: A manufacturing method of a single-layer brazed diamond grinding wheel, the matrix of the diamond grinding wheel is prepared by a machining method, and the matrix is ​​degreasing and derusting. Ni-Cr-based solder is Ni-Cr-B-Si alloy, including Cr 17(wt)%, B 3.5(wt)%, Si 4.0(wt)%, C 1(wt)%, Fe 5.0(wt) %, the balance is Ni. The mass 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 is mechanically stirred for 20 minutes to mix evenly, and then a grinding wheel blank is prepared in the order of the grinding wheel matrix / brazing alloy / diamond abrasive grains. The grinding wheel matrix is ​​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 performed at 780°C for 10 minutes to make the brazing alloy react with the diamond abrasive grains, and then cooled to room temperature with the fur...

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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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