RESEARCH ON THE ON-LINE MEASURING SYSTEM FOR THE MIDDLE-CONVEX AND VARYING ELLIPSE PISTON SKIRT

摘要

The middle-convex and varying ellipse piston is the key component of an internal-combustion engine. In general, the piston is machined by non-circular section CNC lathe, but the measuring of piston profile is manipulated by off- line. Because the off-line measuring reference is different from the machining reference, the measurement result is diverse from the actual dimension. A new method to measure the middle-convex and varying ellipse piston profile, which is known as on-line measuring, is presented. By using this kind of method, the high measurement accuracy can be gained, as well as meeting the production requirement.