Measurement For The Cavity Radial Runout Value And Theradius Variation Of OAP Mandrel Based On LabVIEW

The Automotive OAP(Overrunning Alternator Pulley)Pulley is a new type of automotive engine pulley that protects the engine,maintains rotational stability,and reduces carbon monoxide emissions.The OAP mandrel is the core component of this new type of pulley.The processing quality of the OAP mandrel directly affects the performance of the automotive OAP pulley.At present,the precision of OAP mandrel machining in China is mainly detected manually,and the labor intensity is high,and the detection rate is not high.In particular,the size of the mandrel cavity cannot be accurately measured at present.Therefore,in order to realize the automatic on-line detection of OAP mandrel and improve the accuracy and accuracy of measurement,this paper mainly studies the radial runout and radius variation measurement of OAP mandrel cavity needle roller contact point.The OAP mandrel is mounted on a high-precision hydrostatic spindle and a large range of inductive sensors contact the mandrel cavity.The hydrostatic spindle drives the OAP mandrel to make one revolution.The computer collects the inductive sensor signal to obtain a cross-section cavity profile signal,and then moves the position of the inductive sensor.The same method is used to obtain the five-section profile signal of the OAP mandrel cavity.This paper presents a polar coordinate conversion method that eliminates OAP mandrel gyro eccentricity,and then extracts OAP mandrel cavity radial runout and diameter variation.In this paper,the discontinuous section contour signal is used to perform the least-squares circle fitting.The center of the mandrel cavity locating groove,the diameter of the mandrel contact circle and the diameter of the mandrel outer circle are obtained.Based on the above principles,an OAP mandrel measurement system was developed.The system includes a mechanical part and a measurement and control part.The mechanical part mainly includes the hydrostatic spindle device,OAP mandrel fixing device and sensor measuring device.The measurement and control part includes two parts: hardware system and software system.The main hardware of the whole measurement system includes the hydrostatic spindle servo motor,displacement sensor,PLC and industrial control computer.The software system includes the PLC-based motion control software and the IPC-based signal acquisition and processing software.Among them,the PLC motion control software is mainly realized.For servo motor control,the IPC software is developed based on Lab VIEW virtual instrument technology,which mainly implements data acquisition and processing.An OAP mandrel measurement method is proposed and an experimental device is built.The data shows that the OAP mandrel cavity needle roller contact point runout repeatability measurement accuracy is less than ± 1.5?m,the radius variation measurement repeatability accuracy is less than ± 1.5?m,to meet the detection accuracy requirements.