Diamond is the hardest, why can it be processed?

Diamond is the hardest material ever discovered. If the tool material must be harder than the part being machined and is a necessary condition for the cutting process, then the diamond cannot be machined. But if we expand our thinking. Do not use solid tools to process, then diamond processing problems can be solved. In recent years, many special processing methods have been created in the world; such as electric spark, electron beam, ultrasonic and laser processing. These machining methods are not processed using solid tools, so the hardness of the parts to be machined is not limited. For example, the principle of laser drilling is to focus a high-energy laser beam on the surface of the part. This small area produces extremely high temperatures. Thereby, the surface material is sharply melted, and the well rapidly vaporizes and evaporates, creating a hole in the surface of the part. Therefore, most materials, including diamond, can be punched with a laser. Therefore, laser applications are becoming more and more widely used. For example, spinnerets used in the chemical fiber industry, rocket fuel nozzles, carbide or diamond wire drawing dies, gemstone bearings in the watch, etc., must use lasers to machine small holes in very hard materials.  

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