摘  要

本设计是基于空气压缩机缸体6-M5螺纹钻孔组合机床的加工工艺规程及一些工序的专用夹具设计。空气压缩机缸体6-M5螺纹钻孔组合机床的主要加工表面是平面及孔系。一般来说，保证平面的加工精度要比保证孔系的加工精度容易。因此，本设计遵循先面后孔的原则。并将孔与平面的加工明确划分成粗加工和精加工阶段以保证孔系加工精度。

基准选择以空气压缩机缸体6-M5螺纹钻孔专机的输入轴和输出轴的支承孔作为粗基准，以顶面与两个工艺孔作为精基准。主要加工工序安排是先以支承孔系定位加工出顶平面，再以顶平面与支承孔系定位加工出工艺孔。在后续工序中除个别工序外均用顶平面和工艺孔定位加工其他孔系与平面。支承孔系的加工采用的是坐标法镗孔。整个加工过程均选用组合机床。夹具选用专用夹具，夹紧方式多选用手动夹紧，夹紧可靠，机构可以不必自锁，因此生产效率较高，适用于大批量、流水线上加工，能够满足设计要求。

关键词：空气压缩机缸体；6-M5螺纹钻孔；工艺；夹具；组合机床

ABSTRACT

Design is based on the air compressor cylinder block 6- M5 thread drilling combined machine tool processing procedures and some procedures of the special fixture design. Air compressor cylinder block 6- M5 thread drilling combination machine tool main machining surface is plane and hole system. Generally speaking, it is easier to ensure the machining accuracy of the plane than to ensure the machining accuracy of the hole system. Therefore, this design follows the principle of first face and then hole. and the machining of the hole and plane is clearly divided into rough machining and finishing stages to ensure the machining accuracy of the hole system.

Base selection takes the support hole of the input shaft and output shaft of the air compressor cylinder block 6- M5 thread drilling machine as the coarse reference, and the top surface and two process holes as the fine reference. The main processing procedure arrangement is to process the top plane first by the support hole system positioning, then the top plane and the support hole system positioning processing process hole. In the following process, the top plane and the process hole are used to locate the other hole system and plane. The machining of supporting hole system is boring by coordinate method. The whole processing process all choose the combination machine tool. The fixture adopts the special fixture, the clamping mode mostly uses the manual clamping, the clamping is reliable, the mechanism may not have to lock itself, therefore  High production efficiency, suitable for mass, assembly line processing, can meet the design requirements.

Keywords: air compressor cylinder block ;6- M5 thread drilling; process; fixture; combined machine tool