The Digital Alignment Method Of Box Parts Based On Boring And Milling Machining Center

With a rapid development of NC machining technology, high precision and intelligent NC machining equipment should become the trend of time for the complex box parts. As the basis of processing and manufacturing equipment, it is obvious that the performance and number of NC machine tools are very important to the equipment manufacturing industry. However, the research and application of NC machine tools in our country has a quite big disparity compared with foreign ones, especially for complex box parts on-line detection technology is particularly obvious. Based on the self-developed type boring and milling machining center as a platform, we researched on complex box parts for technology and develop a digital alignment system for complex box parts, it would laid a good foundation for the research of NC machine tools on-line detection technology and improved the efficiency of complex box parts processing.Based on NC machining tools on-line detection technology development as the background, for complex box parts on composite boring and milling machining center alignment efficiency, we put forward the way of NC machine tools on-line detection techniques to realizing automatic digital technology and build the hardware and software platform for complex box parts digital alignment system. Using analytic geometry, mathematical modeling and optimization techniques, we studied deeply the key technology for the digital alignment of box parts:(1)Through the research status for comparative and analysis of on-line detection system and digital alignment method both at home and abroad, we determined this paper researching the digital alignment system mainly used for precision intelligent composite boring and milling machining center for complex box parts, we proposed design requirement and key technology of digital alignment system for the complex box parts and formulate detailed content for the research of digital alignment system.(2)On the basis of analysis of the self-developed compound of boring and milling machining center’s structural characteristics and related parameters, this paper proposed a suitable overall layout for alignment of complex box parts. According to the principle of the trigger type probe, combined with the principle of CNC system and computer system in machining center, we built a hardware platform of digital alignment system.(3)To the origin and sides of complex box parts for machining, using analytic geometry method, we studied the origin and sides processing method of alignment. Setting up the coordinate system of the origin and sides for box parts, through the selection of featuring and measuring points to the box parts, we put forward algorithms for the origin and sides machining alignment.(4)Aiming at holes machining in box parts processing, using mathematical modeling and optimization technology, this paper put forward a suitable optimization design method for holes machining. Combined with the characteristics of holes processing, mathematic models of a single hole and holes processing were built, we used the interior point penalty function method to optimize, determined the optimal path of box parts holes processing and automatically generate boring NC code.(5)In order to improve the accuracy of box parts alignment, we studied further on error compensation technique of digital alignment system. This paper analyzed the measurement points sequence for complex box parts processing and used the least square method for sequence of correcting measuring points and measurement results.(6)Using the above research results, we have developed complex box parts digital alignment system. Through inputting the characteristic values of measurement, system itself can directly generate NC program and feedback to CNC system for data processing.