This article describes the overall processing technology of the ultra-long cylinder, especially the internal pull the hinge hole processing technology from the tooling, cutting tools to machining parameters are introduced in detail to solve the difficult problem of processing very long hole, cylinder machining accuracy is guaranteed.

This paper describes the work Principle of the automatic piston ring chamfering machine，It describes detailed hardware, software design of electrical control system of the machine using MCU，The system realizes functions automaticly such as loading and unloading, piston ring’s plastic, piston ring’s pressure tight, piston ring’s chamfer, stopping short positions alarm, fault alarm, and the communication between the device and host computer.