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采用电火花加工精密模具,可以保证孔的几何尺寸精度达0.01毫米、孔的相对位置精度达±0.005毫米、孔的表面光洁度达8～9级,同时还能保证所要求的锥度。孔的电火花加工应分别采用预加工和精加工。预加工工序除去大部分金属,精加工则使孔获得最后的要求形状,达到要求的精度、光洁度和锥度。当加工余量在1毫米以下时,锥度倾角可按α=17⊿这一经验公式求得(式中⊿系精加工余量,毫米)。在个别情况下,锥度可根据电极进入工件的深
The use of EDM precision mold, you can ensure the accuracy of hole geometry up to 0.01 mm, the relative position of the hole accuracy of ± 0.005 mm, hole surface finish of 8 to 9, while ensuring the required taper. Hole EDM should be used pre-processing and finishing. The pre-machining process removes most of the metal and the finishing results in the hole getting the final required shape to the required accuracy, finish and taper. When the machining allowance is less than 1mm, the taper angle can be obtained by the empirical formula α = 17⊿ (where ⊿ is the finishing allowance in millimeters). In some cases, the taper can be deep into the workpiece depending on the electrode