高压共轨柴油机飞轮周孔高效自动加工机床研制

Efficient automatic flywheel circumferential hole machine tool for high-pressure common-rail diesel engine

针对高压共轨柴油机飞轮边缘孔数多、位置精度及孔深精度要求高的问题,研制了其高效自动加工机床。通过对盘形零件的快速、准确定位和可靠装夹技术分析,采用卧式钻削加工方式,研制了快速自定心夹紧装置,其通过一次装夹就能完成整个盘类零件的圆周面孔加工,而且定位自动化,既降低了劳动强度,又提高了加工精度和加工效率;采用精密行星齿轮减速机驱动的分度机构,可根据飞轮产品的规格要求任意分度,实现了周孔加工位置的精密分度;利用闭环反馈控制的步进电机直接驱动滚珠丝杆的周向钻削孔进给系统,提高了钻孔深度的控制精度。研究结果表明,所研制的高压共轨柴油机飞轮周孔加工机床具有加工精度高、自动化程度高、生产效率高、操作方便等特点,综合性能优于国内同类产品。

Aiming at the requirements of flywheel circumferential hole machine tool for high-pressure common-rail diesel engine,which are large number of marginal holes,high accuracy of position and depth of the holes,an efficient automatic processing machine tool was developed.Through the researches of the fast-accurate positioning and reliable clamping technology for disc-shaped parts,the fast-centering clamping device based on the horizontal drilling method was developed.All of the flywheel circumferential holes can be finished automatically in one clamping,which reduces the labor intensity,but also improves the machining precision and efficiency.The indexing mechanism driving by a precision planetary gear reducer can index randomly according to the product specifications,which realizes the precise indexing of the flywheel circumferential hole.Using closed-loop feedback control of stepper-motor directly drives the ball screw,the circumferential drilling hole feeding system can improve the control precision of the drilling depth.The results indicate that 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 comprehensive performance is better than the similar domestic products.