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Method for manufacturing abrasive wheels for high-speed railway track slabs by brazing diamonds with laser

A technology for high-speed railways and production methods, applied in metal material coating technology, coatings, etc., can solve problems such as low processing efficiency, peeling of electroplating layers, and low service life of grinding wheels, and achieve good grinding quality and fast cooling speed , The effect of high grinding efficiency

Active Publication Date: 2010-12-15
江苏华昌工具制造有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The domestic electroplated diamond grinding wheel has exposed some problems in the process of use, and the outstanding performance is as follows: 1. The life of the grinding wheel is low. The average life of the domestic grinding wheel is only 1 / 3 of the German electroplated diamond grinding wheel, and the stability is poor. The main reason is that the domestic electroplating process is not up to standard , the diamond abrasive at the concave surface of the arc is not fixed firmly, and it is easy to fall off, and the electroplating layer often peels off in pieces, which makes the processing impossible; 2. The processing efficiency is low, about 1 / 2 of the efficiency of the German Burger grinding wheel Due to the defects in the electroplating process of domestic grinding wheels, the diamond abrasives are arranged too densely, the chip space is small, the grinding wheel is easy to block and slip, and the feed speed of the Borg plate has to be reduced; The proportion of board scrapping is as high as 8%

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0015] A kind of laser brazing diamond is made the production method of high-speed railway track plate grinding wheel, by weight percentage, comprises the following steps:

[0016] 1. Mixing materials: Ag-Cu-Ti alloy powder solder and pressure-sensitive adhesive (octyl 55%, butyl fat 23%, acrylic acid 4%, light ethyl fat 3%, vinyl acetate 4%, over Ammonium 0.5%, ammonium bicarbonate 0.5%) are mixed uniformly into solder slurry in a ratio of 1:3;

[0017] 2. Coating: Apply and fix the brazing filler metal slurry on the surface of the grinding wheel steel substrate with a brush evenly with moderate thickness;

[0018] 3. Spraying: the diamond abrasive is evenly sprayed and adhered to the surface layer of the solder slurry on the surface of the grinding wheel; the thickness of the solder slurry on the surface of the grinding wheel substrate is 90% of the average particle size of the abrasive.

[0019] 4. Brazing: In a gas protection atmosphere, use laser heating to heat up the s...

Embodiment 2

[0021] 1. Mixing materials: Ni-Cr-B-Si alloy powder solder and pressure-sensitive adhesive (octyl 60%, butyl fat 25%, acrylic acid 5%, light ethyl fat 5%, vinyl acetate 4.5% , ammonium peroxide 0.3%, ammonium bicarbonate 0.2%) are mixed uniformly into solder slurry in a ratio of 1:3;

[0022] 2. Coating: Apply and fix the brazing filler metal slurry on the surface of the grinding wheel steel substrate with a brush evenly with moderate thickness;

[0023] 3. Spraying: Evenly spray and inlay the diamond abrasive on the surface layer of the solder slurry on the surface of the grinding wheel, so that the thickness of the solder slurry on the surface of the grinding wheel substrate is 110% of the average particle size of the abrasive.

[0024] 4. Brazing: In a gas protection atmosphere, use laser heating to heat up the solder until the solder melts. The brazing temperature is the melting point of the solder + 50°C. After cooling, the diamond abrasive is brazed and fixed on the surf...

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PUM

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Abstract

A method for manufacturing abrasive wheels for high-speed railway track slabs by brazing diamonds with laser comprises the following steps: 1) mixing; 2) coating; 3) spraying; and 4) brazing. The abrasive wheels have the advantages of high grinding efficiency, long life, good grinding quality and the like. Compared with other brazing methods, the method has the following advantages: the energy density of the laser heat source is high, temperature raising and reducing are fast, local heating can be carried out and the heat affected zone is small; the laser beams can be transported by optical fibers, thus machining can be carried out on the parts which are not easy to braze by the conventional methods, the flexibility is good, the workpieces with complex geometrical shapes can be brazed and super-long, super-large, super-thin and super-fine special tools can be manufactured.

Description

technical field [0001] The invention belongs to the field of abrasive tool manufacturing, in particular to a production method for manufacturing high-speed railway track plate grinding wheels by laser brazing diamond. Background technique [0002] On August 1, 2008, the Beijing-Tianjin intercity high-speed railway with a speed of 350 kilometers per hour was put into operation, creating a new era of high-speed railway in my country. In order to ensure the smoothness, stability and safety of the track lines, the steel rails of my country's high-speed railways are not laid on ordinary sleepers, but on track slabs that have been precisely polished by machine tools - Borg slabs. Grinding is required at the place where the Borg plate is connected to the rail, including two inclined sides, a bottom, and two grooves at the junction of the bottom and both sides, forming a complex special-shaped surface with a grinding allowance of 2mm and a grinding accuracy of 0.1 mm. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
Inventor 肖冰华川海
Owner 江苏华昌工具制造有限公司
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