1, improve the cutting method
(1) a change in place as coarse, fine cutting two cutting, so that the first time after cutting the distortion is corrected in the fine cutting, cutting the amount of fine cutting should be based on the distortion first after cutting and decide, general take around 0.5mm. This situation often used in complex shape, easy to produce distortion of parts or requiring high precision, with the clearance of die less;
(2) change the two clamping for single point pressure, so that the cutting process can be done to prevent distortion free, two clamping effect on distortion. But should notice, single point clamping reasonable parts usually at the end. Distortion which affects only the waste parts, to avoid the influence on the forming part of the;
(3) for cutting parts easy to distortion, should according to the shape of parts feature to co-ordinate arrangements for the starting point, cutting programs to clamp position, to minimize distortion. General choice of relatively flat, the starting point has been finishing or setting the line on machining performance has little effect on the position of the cutting.
2, select the reasonable parameters
(1) with high peak and narrow pulse electrical parameters, so that the workpiece to the gas phase from escaping, gasification heat greatly higher than the heat of fusion, taking away most of the heat, to avoid overheating and distortion of the workpiece surface;
(2) by measuring pulse, control the discharge pulse length, but also solve the problem of local overheating, eliminating the crack;
(3) the pulse energy effect on the cracking is extremely obvious, with great energy, cracking was wider and deeper; very small pulse energy, use finishing electrical specification, the surface roughness value Ra<1.25um, the general is not easy to crack.
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