A Smart Boring Bar for Compensation of Radial Deformation during Machining

Holes with a length-to-diameter ratio larger than 10 are usually defined as deep holes. As an important structure, the shape error of the deep holes structure has a great influence on the performance of the parts. Boring is an important process of deep hole machining. However, in the process of deep hole boring, the high overhang and weak stiffness of the boring bar lead to the deformation and vibration of the boring bar in the process, which easily causes large shape errors and difficult to meet the accuracy requirements. Intelligent machining based on compensation technique is a good way to solve this problem. This paper designed a smart boring bar which can detect radial deformation and compensate it in real time during machining. The device included radial deformation detection module, information processing module and feedback execution module. The photoelectric position sensor was used to measure the radial deformation of boring bar and give signal to information processing module, the information processing module processed and calculated the information from the information detection module, and got feedback pulse signals to feedback execution module, feedback execution module of the stepper motor received the pulse signal to drive the cam rotation, so as to adjust the position of the blade, completed the boring bar radial deformation compensation. In this way reduce the shape error in the machining process, the machining precision is improved, thus improved the service performance and life of the parts.