A kind of laser-assisted grinding method of natural diamond scribing knife

Abstract

The invention relates to a laser-assisted grinding method for a natural diamond scoring knife, which belongs to the field of diamond tool grinding and polishing, and comprises a natural diamond scoring knife grinding unit, a laser-assisted processing unit, a temperature closed-loop control unit, and a grinding force feedback unit. The natural diamond scoring knife grinding unit adjusts the angle of the natural diamond scoring knife through the fixture to make the grinding surface contact the cast iron grinding disc and transmit pressure, and the cast iron grinding disc is driven by the motor to rotate for grinding. The laser-assisted processing unit irradiates the diamond surface coating area with the laser beam emitted by the laser, and heats the grinding surface through heat conduction. The temperature closed-loop system monitors the temperature information of the entire coating heating zone and feeds back to adjust the output process parameters of the laser. The grinding force feedback unit monitors the grinding state in real time according to the change of the grinding force, and the present invention has the beneficial effect of realizing high-efficiency and high-quality thermochemical grinding of natural diamond scoring knives through laser selective heating.

Description

technical field [0001] The invention belongs to the field of grinding and polishing of natural diamond tools, in particular to a laser-assisted grinding method for natural diamond scoring tools. Background technique [0002] Natural diamond has the advantages of high hardness and good thermal conductivity, and is widely used in the field of precision and ultra-precision machining tools. However, its excellent performance also brings great difficulties to the processing of natural diamond. Many problems such as low processing efficiency, high processing cost, and poor surface quality need to be solved by advanced diamond planarization technology. Mechanical grinding is a traditional and common diamond processing method, but the grinding efficiency of this method is low, and it will cause a thicker metamorphic layer on the diamond grinding surface, which will affect the service life of subsequent diamond tools. With the continuous development of diamond grinding technology, t...

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Problems solved by technology

However, its excellent performance also brings great difficulties to the processing of natural diamond. Many problems such as low processing efficiency, high processing cost, and poor surface quality require advanced diamond planarization technology to solve

Mechanical grinding is a traditional and common diamond processing method, but the grinding efficiency of this method is low, and it will cause a thicker metamorphic layer on the diamond grinding surface, which will affect the service life of subsequent diamond tools

With the continuous development of diamond grinding technology, the method of using thermochemical polishing to improve the grinding efficiency and grinding quality has emerged. The principle is to use the electric heating wire to heat the grinding device placed in the vacuum, and activate the carbon atoms of the diamond at high temperature to break free. The lattice bond is adsorbed by the iron atoms on the grinding disc, which accelerates the diamond graphitization process, which can greatly improve the grinding efficiency and reduce the thickness of the metamorphic layer to less than a few nanometers, but this processing method will lead to The cast iron grinding disc is heated and deformed to affect the machining accuracy of the diamond. In addition, the high temperature in the device will melt the brazing layer material of the tool holder and the diamond, thereby affecting the grinding quality; moreover, the processing conditions of this method are harsh, and the process technology is difficult to control

Later, someone proposed a method of grinding diamond using the principle of dynamic friction. By adjusting the processing parameters, the frictional heat effect was used to form a high temperature between the diamond surface to be ground and the cast iron plate, providing the heat required for the thermochemical reaction, improving the grinding efficiency and reducing the thickness of the metamorphic layer. However, this grinding method has extremely strict requirements on the setting of process parameters in the processing process, and it is also difficult to control and is still in the stage of theoretical research.

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