ZHANG Zhi-ming1，CHEN Guo-jin2，XV Ming2
（1. Zhejiang Fangyuan Mechanical and Electrical Appliances Manufacturing Co.，Ltd，Zhuji 311816，China；
2. School of Mechanical Engineering，Hangzhou Dianzi University，Hangzhou 310018，China）
Abstract：Aiming at the requirements of flywheel circumferential hole machine tool for high-pressure common-rail diesel engine，whichare large number of marginal holes，high accuracy of position and depth of the holes，an efficient automatic processing machine tool wasdeveloped. Through the researches of the fast-accurate positioning and reliable clamping technology for disc-shaped parts，thefast-centering clamping device based on the horizontal drilling method was developed. All of the flywheel circumferential holes can befinishedautomatically in one clamping，which reduces the labor intensity，but also improves the machining precision and efficiency. Theindexing mechanism driving by a precision planetary gear reducer can index randomly according to the product specifications，whichrealizes the precise indexing of the flywheel circumferential hole. Using closed-loop feedback control of stepper-motor directly drives theball screw，the circumferential drilling hole feeding system can improve the control precision of the drilling depth. The results indicatethat the developed flywheel circumferential hole processing machine tool for high-pressure common-rail diesel engine has the
characteristics of high precision，high degree of automation，high production efficiency and convenient operation，whose comprehensiveperformance is better than the similar domestic products.
Key words：high-pressure common-rail diesel engine；flywheel circumferential hole；machine tool