The middle convex and varying ellipse piston is th e key component of an internal combustion engine In general,the piston is mac hined by non circular section CNC lathe,but the measuring of piston profile is man...The middle convex and varying ellipse piston is th e key component of an internal combustion engine In general,the piston is mac hined by non circular section CNC lathe,but the measuring of piston profile is manipulated by off line Because the off line measuring reference is differen t from the machining reference,the measurement result is diverse from the act ual dimension A new method to measure the middle convex and varying ellipse p iston profile, which is known as on line measuring, is presented By using thi s kind of method,the high measurement accuracy can be gained,as well as meeting the production requirement.展开更多
The measurement of the middle-convex and varying ellipse profile of a pistonskirt is a key technology because of its complex profile and high precision. Generally, a piston ismeasured on special device after it is mac...The measurement of the middle-convex and varying ellipse profile of a pistonskirt is a key technology because of its complex profile and high precision. Generally, a piston ismeasured on special device after it is machined. High accuracy can be achieved through this off-linemeasurement, but the result diverges from the actual dimension. Therefore, a no-contact in-sitemeasurement system is proposed. A laser displacement meter is used to measure the profile of thepiston skirt. A computer connected to the meter is used to process the measured data. A regressionanalysis method is used to process the ellipse section data. The method of moving average is used toprocess the middle-convex curve data. By using the given system, high measurement accuracy can begained, and the production requirement is met.展开更多
基金This project is supported by National Natural Science Foundation of China(No.59675066).
文摘The middle convex and varying ellipse piston is th e key component of an internal combustion engine In general,the piston is mac hined by non circular section CNC lathe,but the measuring of piston profile is manipulated by off line Because the off line measuring reference is differen t from the machining reference,the measurement result is diverse from the act ual dimension A new method to measure the middle convex and varying ellipse p iston profile, which is known as on line measuring, is presented By using thi s kind of method,the high measurement accuracy can be gained,as well as meeting the production requirement.
基金This project is supported by the Fifth China Technology Innovational Items (No.01-101-19-13).
文摘The measurement of the middle-convex and varying ellipse profile of a pistonskirt is a key technology because of its complex profile and high precision. Generally, a piston ismeasured on special device after it is machined. High accuracy can be achieved through this off-linemeasurement, but the result diverges from the actual dimension. Therefore, a no-contact in-sitemeasurement system is proposed. A laser displacement meter is used to measure the profile of thepiston skirt. A computer connected to the meter is used to process the measured data. A regressionanalysis method is used to process the ellipse section data. The method of moving average is used toprocess the middle-convex curve data. By using the given system, high measurement accuracy can begained, and the production requirement is met.
