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Research on Method of On Machine Inspection for Profile Information of Drill Pipe Thread

SUN Xing-wei;YU Xin-yu;DONG Zhi-xu;School of Mechanical Engineering,Shenyang University of Technology;  
In order to solve the problem that the oil drill pipe thread can't detected by the modern measurement method due to practical factors,design and implementation the drill pipe thread profile information on machine measurement system. The original data of the thread profile are collected by the laser triangulation method. This paper proposes a newmethod for the of the cloud data noise reduction with by combining the adaptive Laiyite criterion with the improved wavelet adaptive threshold,and the method is applied to noise reduction the scanned data,the data were fitted by robust least squares. Then,the feature points are segmented and extracted according to the fitting profile derivative. Finally,the profile of the thread is obtained,used it to calculate the thread parameters,and judge real-time processing quality. This measurement allows in-machine non-contact measurement and detection of threads,easy to operate and can be real-time detection thread processing quality. The accuracy and efficiency of the detection was improved.
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