The Study Of Automatic Adjusting Tool On NC Repair Machining System Of Thread Based On CCD Sensor

The numerical control that broad existence is machining again on workpiece according to its original thread helical line basis in reality, like Petroleum boring bar connection thread renovation machining ,screw finish machining etc. As lathing is required to be implemented on original thread groove basis, and it is not easy to assemble the time axis fixing position, at the same time it is very difficult to ensure that chief axis zero position signal happening location point is consistent with original thread helical line Starting point, the numerically controlled lathing needs to explore new method to implement the above-mentioned accessory lathing.In this paper, take petroleum boring bar connection thread renovation machining as an example, against the emendation problem of processing the CNC lathe along trench on original workpiece thread, submit methods based on CCD sensors and digital image processing technology access to the workpiece location and parameters of information, implement automated processing emendation through Motion control card.This issue of the actual situation, selected to meet the requirements of the CCD camera, image capture card, computer systems and motion control cards, make up the hardware with CNC lathes. Through the use of CCD camera and image capture card to distill image from the thread workpiece to a computer and show it on the screen, remove image noise with the image processing methods, image segmentation, feature extraction and image parameters information analysis, solving image contours Point the relative coordinates, get workpiece geometry information via measuring. According to coordinate relations between the logic, motion control card by calling the control function, generate NC procedures, combined with zero signal correction system, and automatic processing thread of emendation, to finally repair damaged threads.Through study above, completed the methods based on the CCD sensor CNC lathes thread on the automatic processing knife methods. This designed methods display the advantages of a CCD sensor non-contact measurement, implement that replace from "searching processing" of intelligent search processing theory to traditional "targeting process", high efficiently, high-precisely completed repair processing of the damaged threads Controlled lathes, and extended the life of the workpiece, also provide a precedent for the visual non-contact measurement method of CCD sensor, against other types of numerical control systems online workpiece detection processing applications.