Shoe Last Surface Modeling And Nc Machining Program Generated Automatically

To improve the manufacturing ability of shoe last in our courty and enhance the market competition of shoe last,this paper discusses to change the manufacturing technology of shoe last by using CAM(Computer Aided Manufacturing).Study the data processing method of shoe last from receiving detecting data to producing NC program and built the CAM software system of shoe last based on WINDOWS.The veracity and valility of characteristic recognizing is important to the machining quality of shoe last. This paper analyses and compares two methods of characteristic recognizing.Based on the space distribution of sharp-point in shoe last's surface, study the problem of sharp-point data recognizing among the data of shoe last and put forward the method of sharp-point data recognizing and sharp-point data filtering. Because the noise in detecting data of shoe last has bad effect on the fairness of last's surface,advance the method of subsection N-points mean value filtering.On the base of precision ,advance sampling method for data compressing and compressing- style method for data saving,so that the data is suitable for network transmitting and carry-home. Digital modeling development is the important technology in CAM of shoe last. Contraposing the problem of different direction between detecting and development of shoe last,study the method for getting parameters of relative space position between two coordinate systems.basing on the criterion and principle of development,discuss the method of how to get the parameters of development and develop through modeling of shoe last.To easy to machine shoe last ,study the method for getting the parameters of relative space position between development coordinate system and machining coordinate system, and put forward the method of building the coordinate for machining.Analysising the unevenness of data after the modeling development,advance the method for generating track points for the NC machining with landscape orientation and longitudinal interpolation.Especially discuss the characteristic of data that near the sharp-points, present the linear intersect method and near rule of three. To insure the quality of modeling for building track of NC machining and improve efficiency of data processing,discuss two modeling methods using B-spline on the base of the characteristic of track points' space distribution .And put forward a method of using subsection semieven B-spline to build the track of NC machining.To improve the surface's fairness, study the method for generating NC tool position.Also study the method of building machining control parameter and NC program contraposing command format of the NC system. Basing on the above studies, develop a shoe last CAM software system based on WINDOWS by using the tools, VC++ and OPENGL,which gives a solution to the problem of digital machining of shoe last.