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在电解加工中,加工间隙是选择加工参数的核心。一般资料中介绍加工间隙范围为0.1～0.8mm,理论上当加工达到平衡状态时,加工间隙与平衡间隙相等。在实际加工中,电解液通常是不更换的,因此对于给定的加工材料,加工间隙越小,加工速度越高,复制的精度也愈高;但过小时,间隙中电解产物难以排除而产生火花放电或引起短路,损坏工件或阴极,所以实现小间隙加工的关键在于能有效的去除加工间隙中的电解产物。对于扭曲度较大的涡轮叶片,由于加工面大,形状复杂,间隙各处的电解液流速不均匀,要实施小间隙加工的难度更大,下面讨论扭曲叶片的小间隙加工问题。
In electrolytic machining, machining gap is the core of the choice of processing parameters. General information describes the processing gap range of 0.1 ~ 0.8mm, in theory, when the processing reaches equilibrium, the processing gap and the equalization gap. In actual processing, the electrolyte is usually not replaced, so for a given processing material, the smaller the processing gap, the higher the processing speed, the higher the accuracy of replication; but too small, the gap in the electrolysis products difficult to rule out arising Spark discharge or cause short circuit, damage to the workpiece or the cathode, so the key to achieve a small gap in processing can effectively remove the electrolysis products in the gap. Turbine blades with larger distortions are more difficult to implement with small clearance due to the large machined surfaces, complex shapes, and uneven electrolyte flow rates across the gap. The issue of small clearance machining for twisted blades is discussed below.