Talking about the Principles of Clamping and Fixture Selection and Machining Errors in NC Machining

There are many contents in CNC machining, so the previous ones are also introduced one after another, and it is no exception. It is also about this aspect, but the content is definitely not in the website www.wxdtc.com. What are the specific contents, I will not be here. Sum up, everyone will understand after reading it. At the same time, understanding these is also an extension of precision mechanical parts processing.
1. The basic principles of the clamping, positioning and installation of parts in CNC machining are mainly to choose the positioning datum and the clamping plan reasonably. The specific principles to be followed are: (1) Design, process, and programming. The benchmark is unified; (2) The number of clamping and mounting should be reduced as much as possible, and the processing surface can be processed after one clamping and positioning as much as possible. 2. The basic principles of selecting fixtures in CNC machining (1) The coordinate directions of fixtures and machine tools should be relatively fixed, and the dimensions of parts and machine tool coordinate systems should be coordinated as much as possible. (2) If the processing volume is not large, modular fixtures, adjustable fixtures or other universal fixtures should be used as much as possible to shorten production time and reduce production costs. (3) If it is mass production, then special fixtures can be considered, but the fixture structure should be as simple as possible. (4) The loading and unloading of parts should be fast, convenient and reliable, and the parts on the fixture should not hinder the processing of the various surfaces of the parts. 3. Machining errors in CNC machining The machining errors in CNC machining mainly include programming errors, machine tool errors, positioning errors, and tool setting errors. Programming error: It is the error generated in the programming process, which consists of approximation error and rounding error. Machine tool error: mainly includes CNC system error, feed system error, etc. Positioning error: it is the error produced by the workpiece or fixture during the positioning process. Tool setting error: refers to the error generated when determining the relative position of the tool and the workpiece.