Research on Retreading and Molding Tyres Based on CNC System
|Course||Power Electronics and Power Drives|
|Keywords||Servo system Numerical molding Retreading tires Interpolation algorithm Position control|
Thanks to the development of economy and improvement of technology, vehicles have become the most popular traffic tool for human, which also bring about the "black pollution" problem-the increased scrap tyres. Tyre retreading, nowadays the most efficient and commonly used way dealing with used tyres, is an environmental-friendly industry, orienting in solving tyre-pollution and saving resources. It is also a necessity to the whole tyre industry. So here is vital problem- how to make sure the retreaded tyres are as well as new tyres in security and mileage. So, to solve the problems, the full-automatic tyre grinding machine is developed. Following are the main ideas of every chapters.Firstly, this dissertation begins with the value and development of the retreading tyre industry, as well as the theory of retreading tyre. It shows tremendous social benefit and economic benefit of industry. And then, the dissertation analyzes the technology gap between domestic and foreign refurbishing tires industry, claiming another aims of the article-improving the domestic tyre retreading technological level. At present, the domestic retreading tyre system is almost semi-automatic or totally artificial, so the precision and efficiency is low. However, the new grinding system adapts the machine tool servo feeding, forming a two axis CNC and makes a controller combined with man-machine system and PLC. The new controller and two axis CNC together realize the flexible parameter adjustment, automatic grinding, and then efficiency and precision can be improved twice.Then, the paper researches the servo motion system and builds the machine tool servo feeding systematic mathematic model, which drives delivery function, analyzing the characteristic property of feeding system and the major factor of the static characteristic of system. On the basis of the studied curve of the servo system and previous studies, it proposes a new interpolation algorithm and interpolation algorithm eventually. Based on the principle of interpolation, developing linear interpolation and arc interpolation programs according to point to point compare interpolation theory, in this way making the system have point to point and track control functions.The paper also designs the hardware and software of the system. The hardware includes parts selection, terminal I/O distribution and wiring diagram. The software program includes control software design and procedures. The author programmed a GOT monitor system, designing a machining parameter setting, an alarm display, a machining state monitor and a jog operation screen. Under this program, the system can achieve monitoring and setting functions by switching between different screens, which is convenient for repairing and maintenance.Finally, through the actual motion, the invented two axis CNC grinding machine system works well and meets the normal operation.After further improvement, it can be promoted widely to develop the retreading tyre industry.