During the use of tungsten carbide die tools, with the passage of time, many problems will gradually appear, among which common problems such as chipping or crushing are one of the common problems! Because of the high hardness and low toughness of tungsten carbide itself, it is determined that tungsten carbide is prone to chipping after continuous use or the dislocation of the die tools.
We may change the characteristics of tungsten carbide itself. Apart from these reasons, is there no other reason for me? In fact, based on our many years of experience in tungsten carbide processing with Fuji tungsten carbide punches, there are still many reasons for the possibility of tungsten carbide collapse! That is the surface of tungsten carbide processed by electro-erosion!
Machining masters all know that tungsten carbide is a super-hard material, so there are not many processing methods for tungsten carbide at this stage. For plane processing, use surface grinding to process, and use internal and external circular grinding or coordinates for internal and external holes. For grinding, optical grinding is generally used for surface or R processing, electrical discharge processing is used for special-shaped positions, and wire cutting processing is used for through holes or shapes. The electrical discharge or wire cutting process is to complete the part processing through the surface high-voltage electric corrosion, so to sum up, in addition to the grinding process, it is the electric corrosion process.
Does electric corrosion affect the surface of tungsten carbide? The result is yes! Because the principle of electrical machining is to make the surface of the tungsten carbide die tools form a high current instantaneously, the surface of the tungsten carbide die tools will be corroded to form the shape to be processed. At the same time as the corrosion, the high current voltage will also form a line on the surface of the tungsten carbide die tools. The cracks of the strips, it is this strip of cracks that causes the die tools to continue to expand after continuous use, leading to the final chipping or breaking of the die tools.
Therefore, in addition to the characteristics of the material itself, the chipping problem of the die tools is more partly due to the processing method. The tungsten carbide still needs to use electric discharge machining as little as possible to prevent the formation of small cracks on the surface after electro-corrosion and cause the die tools to collapse.
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