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2.3关键工序尺寸精度及形状位置精度的工艺保证措施 2.3.1底平面的加工底平面:图纸要求平面度0.075mm,表面粗糙度Ra12.5,是主要工艺基准,为了保证后续工序的加工精度,工艺上应提高底平面平面度要求,采用粗铣—半精铣—精铣三道工序加工。半精铣、精铣均选用滚珠丝杠传动,变频伺服电机驱动的高刚度高精度组合铣床,山特维克机夹不重磨密齿端铣刀铣削,半精铣底平面平面度应达到0.04mm,保证对顶平面平行度0.04mm,为以后的加
2.3 The key process dimensional accuracy and shape of the position accuracy of the process to ensure that 2.3.1 the bottom plane of the bottom plane: drawings required flatness 0.075mm, surface roughness Ra12.5, is the main process basis, in order to ensure the accuracy of subsequent processing, The process should be to improve the flatness of the bottom plane requirements, the use of rough milling - semi-fine milling - precision milling three processes. Semi-precision milling, precision milling are selected ball screw drive, variable frequency servo motor driven high-precision high-precision milling machine, Sandvik machine folder without ream grinding end milling cutter, half-milling the bottom plane flatness should reach 0.04 mm, to ensure that the parallelism of the top plane 0.04mm, for the future plus