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

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...

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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%