Research On NC Cutting System Of Non-standard Part Contour Based On Machine Vision

Gasket is widely used in mechanical industry.Gaskets of diffe rent shapes,combinations and materials often play a role of firm sealing to avoid leakage,buffer and shock absorption to reduce collision wear,increase contact area to prevent connection from loosening,etc.One enterprise processes the synthetic leather gasket used in military equipment.At the same time,the gasket made of this material is used in many kinds of equipment,and most of them are non-standard parts with big difference in shape and size.At present,the employees of the enterprise adopt the method of first measuring the relevant dimensions of the installation position of the gasket manually,then drawing the figure on the computer,and then using the special cutting equipment to carry out the production of synthetic leather gasket.This method is not only inefficient and cannot guarantee the processing accuracy,but also requires the operator to master the measurement and tolerance,computer-aided design and other skills,which to a certain extent Increased training costs for businesses.In order to improve the efficiency and accuracy of the existing synthetic leather gasket processing through the application of machine vision technology,the following work has been done in this paper.First of all,a kind of CNC machining system of gasket is put forward,which combines machine vision technology.The main types of camera,lens and light source in the vision system are selected to realize the hardware construction of machine vision according to the actual needs;the gasket cutting equipment is redesigned to reduce the volume and increase the flexibility compared with the original equipment;MATLAB is selected as the software of machine vision algorithm development,which provides the basis for the programming and function integration;and Zhang’s calibration method is used to calibrate the system to obtain the internal and external parameters of the camera.Secondly,the flow chart of image processing module is established.The core is the effective removal of noise and image segmentation.In order to get a better denoising effect,the least mean square error filter is improved.In order to segment the target and non target in the image more effectively,an image segmentation method based on the target gray level is proposed.Combined with the classical Canny operator,the good acquisition of the target edge is achieved.Thirdly,the way to generate NC code for gasket machining is clarified.After sorting the target edge points by the contour tracking method,the edge fitting is carried out,the coordinate information of the fitting edge points is extracted,and the LSP file is compiled.The LSP file is loaded by AutoCAD and saved as a DWG file to complete the vectorization of the edge.The DWG file can be read by Mastercam and generated with some operations.Finally,not only the cutting movement of gasket cutting machine is simulated by MATLAB,but also the operation interface is designed.The coordinates of the fitted edge points are introduced into the cutting machine model established by the improved D-H method,and the cutting process is simulated by the robot inverse kinematics,which verifies the rationality of the equipment structure and the feasibility of the cutting movement.An operation interface is designed and the effectiveness and feasibility of the whole system and algorithm are verified by the experiment.