Research On A Numerical Control System For Tube Bending Machine Based On Embedded Motion Controller

With the rapid development of modern automobile manufacturing industry, aviation and space industry and other industries, the market's demand for pipe pieces and the requirements of higher precision is increasing. Traditional manual processing and low-precision machining has been unable to meet the practical needs. CNC tube bending machine is a combination of CNC technology and traditional pipe bending technic, which emerged with the development of machine tool industry. It has great higher degree of automation and higher efficiency, and is very suitable for fast and accurate bending of complex space curved parts. As the core of CNC pipe bending machine, the performance of control system has a significant impact to the accuracy and efficiency of the whole equipment. Therefore, research and development of advanced tube bending control system is of a great practical significance.Given the shortages of control system existing in the current markets, to develope a kind of CNC bending control system having stronger function, more stable performance, smaller size and lower price with an embedded motion controller as the core is proposed in this paper for the first time, which is an important innovation based on the the traditional motion control system.A variety of traditional and new bending technologies, the development status of CNC pipe bending machine at home and abroad are firstly summarized in this article. The characteristics of each pipe bending technic are analyzed to determine doing research and development on the control system suitable for single-die rotary draw bending machine with mandrel. Control requirements are proposed according to the composition and structure of CNC rotary draw bending machine and its working principles. The current common tube bending machine control systems based on SCM or PLC are deeply investigated, and their composition and functional characteristics analyzed, disadvantages pointed out. Considering the current development trend of CNC control system, the proposal to develope a control system with open embedded motion controller as the core was made, and both of the hardware system and software system are overall designed. According to the hardware system design, and combined with the motion characteristics of pipe processing and functional requirements to control system, appropriate components are selected to build the hardware system, some necessary anti-interference measures are taken.Finally, the relative software system has been developed based on Windows XP operating system,using VC++6.0 and SDI, which realizes file management, system settings, and CNC automatic machining by code programming and decoding and so on. The entire system is stable, of great anti-interference ability, easy to use, has excellent openness both in hardware and software, and has great extensibility and high reliability.