(2) Low processing efficiency
If the workpiece is deformed during the cutting process, the efficiency of the finishing process will be significantly affected. Lightly, the processing efficiency is reduced, and even when the deformation is large, there is even a situation in which the repair is not performed. In order to prevent deformation of the slow-cut wire cutting mold, certain measures must be taken. Firstly, the material with small deformation should be selected, and the correct heat treatment process should be adopted. Secondly, the processing technology should be arranged reasonably. The large cavity or the narrow and complicated cavity can pre-process the release stress of the cutting part, and the large cavity retains multiple sections. For the retention amount, the punched parts should be machined through the threaded holes for closed contour processing. Finally, the cutting path is optimized, including the position of the clamping, the retention amount, and the introduction path.
In order to obtain reliable processing quality, the machining parameters generated by the machine tool expert system are generally conservative, and the amount of material reserved between the two cuttings will be relatively large. In actual production, by modifying the offset and reducing the material allowance, the efficiency of the trimming process can be greatly improved. However, it should be noted that the material allowance cannot be reduced too much, otherwise it will lead to poor handling of the machined surface.
The more the number of trimming processes, the better the surface roughness, and the more refined it will double the processing time. Therefore, the number of cuts should be determined according to the processing requirements of the mold parts, so as to be sufficient, the number of repairs should be reduced as much as possible to meet the processing requirements, so as to ensure high-efficiency mold production. For more than four times of multiple cutting, because the final finishing energy is very small, its discharge state is affected by various factors, and it is easy to have extremely low processing efficiency. This situation can be used for the last refinement. The constant speed cutting is set to ensure the processing speed and the surface roughness that meets the requirements.