The Research On Processing Technology Of Middle-convex And Varying Ellipse Piston Turning

The piston is the important parts of a car engine,it directly determines thequality of the performance of the engine.In order to improve the performance of thepiston itself,continuous improvement of the surface skirt design, now widely usedin Middle-convex and varying ellipse is recognized a good piston skirtsurface.Called the convex variable oval piston skirt cross-section is oval inlongitudinal section over the axis of a shape asymmetry in the convex change thedrum,and the piston transverse cross-section ovality is the change in the axialdirection. Middle-convex and varying ellipse piston as theresearch object,changethe oval on the convex piston turning to in-depth research.The main content is asfollows:1. Middle-convex and varying ellipse piston forming principle.Change in theoval piston is convex round variable cross-section parts, this paper using a type linethe thought of separation, servo motor control and high frequency servo drivestructure of the double tool to realize the change of the elliptic type piston convexprocessing, the X axis and Z axis servo motor servo motor the linkage of theformation of the oval piston is convex of convex line, and the change of the pistonelliptical cross section profile by high frequency is the straight line tool servoreciprocating motion (U axis) and spindle of rotation movement (C axis) linkage ofform.2. High frequency tool servo is convex change in the oval piston turningprocessing key part of the processing requirements with high frequency servo toolhigh frequency, high stiffness and speed and acceleration etc.Characteristics. Thispaper researches on the linear motor servo driver of the frame, and PID controlmethod of linear motor control, enables the system with satisfactory control effect.3. Piston convex line fitting in the oval piston convex variable interpolation inthe convex line by the piston design pattern is to several discrete points are given inthe forms of, these discrete point data for the turning processing is not enough, thispaper use3-spline interpolation is lawful, with the aid of the MATLAB fitting toolin the convex line of discrete points, by fitting the fitted curve equation of that, andthen space with the method of fitting in line for convex interpolation. 4. The piston elliptical cross section of the interpolation algorithm change inany of the oval piston convex cross section for elliptic, elliptical cross section andthe ellipse is changing. This paper use direct function interpolation method of thepiston elliptical cross section profile for interpolation, study the interpolation ofrecursive formula, improve the interpolation algorithm computation speed andmachine tool processing speed increased, and improve the production efficiency.