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Qin Yuexia
Hu Dejin
School of Mechanical
Engineering, Shanghai Jiaotong University,
Shanghai 200030, China |
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NEW METHOD TO MEASURE PISTON SKIRT DIMENSIONS*
Abstract: The measurement of the middle-convex and varying ellipse profile of a piston skirt is a key technology because of its complex profile and high precision. Generally, a piston is measured on special device after it is machined. High accuracy can be achieved through this off-line measurement, but the result diverges from the actual dimension. Therefore, a no-contact in-site measurement system is proposed. A laser displacement meter is used to measure the profile of the piston skirt. A computer connected to the meter is used to process the measured data. A regression analysis method is used to process the ellipse section data. The method of moving average is used to process the middle-convex curve data. By using the given system, high measurement accuracy can be gained, and the production requirement is met.
Key words:
Middle-convex and varying ellipse piston No-contact In-site measurement |