Development And Reliability Analysis Of IC Feeding System Of Placement Machine Based On ARM

With the continuous advancement of semiconductor process technology and electronic component packaging technology,electronic components are developing in the direction of integration and modularization,and the functional units in the origina circuit are replaced by a single IC(integrated circuit).Which greatly promotes SMT(Surface Mount Technology)development of the industry and also put forward higher requirements for IC mounting technology in the SMT industry.The most critical equipment in IC placement production is the placement machine and its IC feeding system.Usually,a PCB needs to mount a variety of IC components,and the IC component placement process requires the IC feeding system for feeding,so the efficiency and accuracy of the IC feeding system greatly affect the SMT Speed and quality of production.Domestic research on the feeding system of the placement machine is relatively lacking,especially in the IC feeding system.Therefore,the research on the IC feeding system of the placement machine has greater engineering significance and application prospects.This paper analyzes and researches the traditional IC feeding system of the placement machine,and develops an ARM-based IC feeding system of placement machine on this basis.The main work content includes the following aspect:(1)The overall plan of the host software + CAN bus + embedded controller + actuator of the IC feeding system is designed.Then it analyzed the servo motion control requirements of the IC feeding system and the servo control scheme based on Ether CAT is selected.Finally,it selected the servo driver and servo motor,and designed the electrical system of the IC feeding system.(2)It designed the embedded controller of the IC feeding system based on STM32 microprocessor according to the actual demand of the IC feeding system.The hardware and software development of the embedded controller has been completed,the interface program of the host computer has been developed,and all the predetermined functions of the IC feeding system have been developed.The flexibility of the IC feeding system movement is improved through the application of the three S-shaped acceleration and deceleration planning algorithm in the embedded controller software,and the IC feeding system's feeding motion trajectory is optimized through the application of linear and circular interpolation algorithms.(3)It analyzed the reliability requirements of the unit in the embedded controller,the reliability model of ordinary series connection and the reliability model of redundancy backup optimization are established respectively.Then,it predicted and analyzed the reliability of the two models by the combination of component stress method,product similarity method and Monte Carlo simulation method.The predicted results show that the reliability of the redundant backup optimized reliability model is significantly higher than that of the ordinary series model.Therefore,the reliability model optimized by redundancy backup is adopted as the development plan of the embedded controller.(4)A servo experiment test platform was built.First,and the servo control experiment of the IC feeding system was carried out on this platform.The motion test results of the 45-degree linear interpolation performed on the motor without load show that the relative error of the X axis and the Y axis is kept within 10 pulse.In the circular interpolation test,the result shows that the interpolation trajectory is smooth and free of burrs.The above experimental results show that the IC feeding system developed in this subject has better servo control performance.Then the IC feeding system was tested on the machine.Then the IC feeding system was tested on the placement machine.The execution efficiency of the optimized replenishing and unloading action can be increased by 27.97% compared with the traditional replenishing and unloading action.The average feeding cycle of the system is 2.9.s.The above test results show that the IC feeding system developed has a higher feeding efficiency.Finally,all functions of the IC feeding system were tested one by one,and the results showed that all functions were executed normally.In summary,the ARM-based chip placement machine IC feeding system developed in this project meets the feeding demand for high-speed placement machines.