Measurement Method Visual Gear Chamfering Contour Based On Telecentric Lens

Chamfering gear is one of the key transmission components in automobile gearbox,its processing quality will directly affect the performance of automotive transmission system.Now,the main method of gear chamfering contour machining quality testing uses contact measurement,which with high accuracy,but in the measurement process the mechanical probe would contact chamfering of gear surface,which easy to damage the probe,and the measurement repeatability is poor.The paper based on the previous research work on laser measurement method of gear chamfering based on visual guidance to do further research.This paper improved measurement method.This method consists of following parts:First,this paper gets a image of measured work piece by CCD camera,Second,use the image to calibrate the camera;Third,get the position of the gear what waits to detect;Fourth,move the laser sensor to measure the bevel profile of gear and that can get the gear chamfering profile information.The measurement method in this paper use VC++programming to realize computer control measurement system of gear chamfering.Due to the machine vision guided laser scanning gear chamfering,measuring method using traditional lens will generate the perspective projection error when get the workpiece image,that can affect the measurement system of gear chamfering positioning accuracy.Therefore,in order to solve the problem of distortion of traditional lens,this paper puts forward a method to measure the position of the gear space by using the telecentric lens.Therefore,telecentric lens visual chamfering of gear measurement method based on can improve gear chamfering measurement precision of the system.The main work of this paper is as follows:(1)This paper measured the accuracy of the X-Y platform,and improves the accuracy of the measurement system.(2)This paper completed the experiment of fitting circle on the image of gear by using the telecentric lens,and this experiment detects the accuracy of the measurement.(3)Research the method on confirmation the target position by using the measurement system,and proposed a new method that can find the edge automatic by using the laser sensor.