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01 mm-0. 1 mm)。加下精度与放电间隙的大小是否稳定与间隙是否均匀有关。间隙愈稳定均匀.其加下精度就愈高.下件加下质量也愈好?br />     (2)电极损?br />     在电火花加下过程巾,随着下件不断被腐蚀,电极也必然要产生损耗。电极损耗会影响下件的加下精?因此.研究与电极损耗有关的因素.并设法减少电极损耗及不良影响是一!分币要的。影响电极损耗的因素主要是电极形状及电极材料?br />     (3)加下斜度对加下精度的影响<br />     在加下过程中随着加下深度的增?二次放电次数增多.侧面间隙逐渐增大.使加下孔人n处的间隙大于出口处的间隙.出现加下斜度.使加工表面产生形状误差?br />     在电火花加T过程?电极不同部位的损耗程度是不同的。如电极的尖角、棱边等凸出部位的电场强度较?易形成尖端放电。所?这些部位损耗快。由于电极损耗速度不均匀.必然会引起加工精度下?<br />     电极的材料不同,电极的损耗程度也不同。其损耗主要是受电极材料热学物理常数的综合影响。当脉冲放电能量相同?以钦和石墨为材料的电极。熔点高,沸点高。耐腐蚀性强.电极损耗小.因此在型腔加下中.常利用石墨材料作电极?br />     2.影响电火花加工生产率的主要因?br />     单位时间内从工件上腐蚀的金属址.称为电火花加工的生产率。生产率的高低受诸多因素的影响?br />     (1)脉冲宽度<br />     对于矩形波脉冲电源,在脉冲电流峰位一定时.脉冲能墩与脉冲宽度成正比.即能量越?加工效率就越高?br />     (2)脉冲间隙<br />     在脉冲宽度一定的条件?脉冲间隙?加工效率高。但脉冲间隙小于某一数值后.随着脉冲间隙的继续减?加工效率反而降低。带有脉冲间隙自适应控制系统的脉冲电?能够根据放电间隙的状态在一定的范围内调节脉冲间?既能保持稳定加下.又可获得较大的加下效率?br />     (3)电流峰?br />     当脉冲宽度和脉冲间隙一定时.随着电流峰值的增加.加工效率也增加。但电流峰值增大将增大下件的表面粗糙度值和增加电极损耗。在生产?应根据不同的要求选择合适的电流山争位?br /></p> </div> <div id="esc9ka7f9a" class="pagess"> <ul><div>上一?<a 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