摘要

夹具是零件加工的夹紧装置，是加工零件的一种必不可少的装置。随着零件的尺寸变化，越来越多的夹具被淘汰了，因此，设计一套专用夹具是十分有必要的。在设计专用家具时要考虑工件的定位方案，工件的夹紧方案和设计夹紧机构，夹具的其他组成部分，夹具的结构形式等。
俩侧面深20 2-M6-7H螺纹底孔钻夹具设计是包括零件加工的工艺设计、工序设计以及专用夹具的设计三部分。在工艺设计中要首先对零件进行分析，了解零件的工艺再设计出毛坯的结构，并选择好零件的加工基准，设计出零件的工艺路线；接着对零件各个工步的工序进行尺寸计算，关键是决定出各个工序的工艺装备及切削用量；然后进行专用夹具的设计，选择设计出夹具的各个组成部件，如定位元件、夹紧元件、引导元件、夹具体与机床的连接部件以及其它部件；计算出夹具定位时产生的定位误差，分析夹具结构的合理性与不足之处，并在以后设计中注意改进。
关键词：专用夹具、工艺路线、工艺分析、基准

ABSTRACT

Clamping device clamps are machined parts , is an essential part of the processing unit . As part of the changes in the size , more and more fixtures are eliminated, therefore, the design of a special fixture is very necessary . In furniture design special programs to consider when positioning the workpiece clamping scheme and design workpiece clamping mechanism , other components of the fixture , fixtures and other structural forms .
Both sides of the deep 20 2-M6-7H starting hole is drilled , including parts machining fixture design process design , process design, and special fixtures designed in three parts. In the process design of the parts to be analyzed first , to understand parts of the process re-design the structure of the blank , and select the machining datum good parts , design process route parts ; then step on the part of each step of the dimensional calculations, the key the process is to determine the amount of various equipment and cutting processes ; then dedicated fixture design, selection of the various component parts of the fixture design , such as the positioning element , clamping elements , guiding elements , specific folder connection with the machine parts and other components ; positioning errors generated when the calculated fixture analyze the rationality and the inadequacies of the fixture structure and attention to improving the design in the future .
Keywords: Special fixtures, routing, process analysis, benchmarking