Research On The Machining Error Compensation For The High-precision Shaft Parts

In mechanical parts processing production, axial parts is an important parts, and inthe field of aerospace, ship, communication and car, especially to the demand of highprecision shaft parts is improving. In order to meet the needs of high precision axialprecision machining, the error compensation is a significant economic value and effectivemeans for increasing accuracy of machine tools. In view of the large size high precisionshaft parts, this paper determines the reigning detection to match the real-timecompensation plan. The error compensation using micro displacement tool postimplementation. In this paper, based on the Schaublin180CNN lathe, design a set of specialmeasuring tool for diameter and a micro-feeding tool rest compensation system.First of all, in this paper the lathe was did the accuracy calibration with the laserinterferometer, that can provide the design parameters for tool test.The second, it was designed that a method is combining high-precision relativemeasurement method with Mechanical contact measurement method. Then completed thestructure design and simulation, and analyse the error caused by clamping force,measuring force, processing and installation.The third, designed the structure of the micro-feeding tool rest, which adopted theelectrostrictive ceramic actuator and double parallel flexible hinge guide mechanism.Then according to the existing stiffness formula, revised the rigidity of simplified modelof the double parallel flexible hinge mechanism. Then through optimization andsimulation, completed the structure designed. And the development of the control systemwas use for a fitting of a polynomial by studying the electrostrictive ceramic of hysteresisand creep model, then validated against it. Through VB to write of PC program, realizedthe real-time control of micro-feeding tool rest.Finally, through the experiment, measured stiffness, natural frequency, travel,positioning accuracy and dynamic response. And the experimental results with thecalculated value and the simulation values were compared, verified the accuracy of thecalculation and simulation. Ultimately determine the static and dynamic characteristicsof the micro-feeding tool rest meet the demand of actual machining accuracy.