IS200DSPXH1CAA
咨询***：18506919598（卢工）
***：312782195
1.粗基准的选择
(1)所选择的粗基：住妥能保证主要加工交由有足够及均匀的加工余量，这样有利于保证主要表而加工的精度和表面层的物理机械性能。
(2)若工件有不需加工的表面，则应选择其巾与加工表面 有相互位置精度裂求的表因为粗基准。如图所示铸造零件，要求加工及表面B，则宜选择毛面C为粗基准，用三爪卡盘兴持C处，这样，孔加工完后零件壁事较均匀。
(4)一个粗基准一般只能使用一次，在练工序中应选择已加工表面作为精基准。但对于精度高的毛坯，如由精销、精锻等方法制造的毛坯，在加工表面相互位置精庭要求较低时也可重复使用同一粗基准。
2.数控冲床价基准的选择
(1)选择精度较高的己加工面为精基准。
(2)使寇位基准与其它基准(如设计基准、度量基准、装配基准)重食，通常称之为"基准重合"原则。当***基准与说计基准不重合日才会产生***误差。
(3)所选择的精基准应使工件安装可辙，在加工时不敖因 切削力的作用而过多地变彤、偏移等，应尽量选较大的加工面为精基准。
(4)所选择的精基惟应尽可能在几个工序中重复使用，即符合"基准同一"原则，可以应免因基准转担起而带来误羞。
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