The Key Technologies To High Speed And High Efficiency Placement Machine Specially Used For LED

LED lighting has many advantages, such as energy conservation, high luminous efficiency, long life, green environmental protection. It will be the main source of illumination in future all over the world with the development of general LED lighting, Placement Machine, one of the important components on LED lighting production line, will be sharp rise in demand. The domestic researches on the placement machine mostly base on general purpose SMT, and still in the development stage.General purpose SMT machine with high precision, multi function characteristic, which determines the general SMT needs high hardware requirements and the difficulty in the development. LED chip mount is affixed with a high speed, low precision, few species and long PCB size. If using the general SMT to mount LED chip, there will be faced with high cost, low mounting efficiency problems. Therefore, The development of a low cost, high speed, high efficient Placement Machine specially used for LED is sure to drive the development of the LED industry, and is the inevitable trend in the development of SMT in the LED industry.This paper will research the key technology to high speed and high efficiency LED placement machine, the main work is as follows:(1) Through the structure analysis of typical pick-place equipment and the research of the LED chip mounting characteristics Design a low-cost, high-speed and high-efficiency LED placement machine with double cantilever beam. It can achieve that one head is on paste while another is on suction. So that it can reduce the mount suction idle waiting time and get a high efficiency.(2) Patch head and feeder directly effect the overall performance of the placement machine. Through the analysis of efficiency in different number of nozzle mount, Design a patch head with two nozzle. Both of this patch head alternating working are more efficient than a single-head with four-nozzle in30%.In addition, under the premise of ensuring accuracy and speed,Design a high speed light belt feeder which is driven by a step-motor, and it’s volume is only1/4of the ordinary feeders. (3) The beam and the frame are two important structural components of the placement machine. It cannot get a good dynamic characteristics only by static mechanical design or experience design. In this paper base on the frequency of design principles combined with the static force checking. making statics and modal analysis on the placement machine’s key structure component such as beams and the frame to make sure that the deformation and the natural frequency is to Achieve a reasonable requirements.(4) The Mesataka Yoshimura method is presented to used in research the stiffness and damping parameters of actual conjoint faces, and complete the dynamic analysis of the placement machine.and analyze the factor affecting the machine’s natural frequencies and mode shapes.(5) Use the LMS vibration instrument to make a hammer vibration test on the prototype to acquire the experimental natural frequency. through comparing with the analysis natural frequency, It shows that the placement machine dynamic performance is Reasonable and effective.The results of the actual prototype mount show that without the visual correction,the LED Placement machine can meet the precision requirement, and the mount speed reaches the domestic high-grade speed. By hammering method dynamic vibration test, we prove that the dynamic analysis on the LED Placement machine basing on the Mesataka Yoshimura method is feasible, convenient, effective and high analysis precision.