Interpolation And Speed Prospective Method Of Small Denture Processing System

The computer-aided manufacturing(CAM)technology of small denture numerical control machining plays an important role in ensuring the efficiency and accuracy of denture machining.However,at present,the localization level of relevant core technologies is relatively low,the cost of purchasing from abroad is very high,and there are still problems such as service response is not timely.In this thesis,the numerical control system of small denture produced by a company is taken as the research object,and the numerical control system technology of small denture is studied from curve interpolation algorithm,speed control algorithm and speed perspective.In order to solve the problem that the numerical control interpolation algorithm in the production of industrial denture can't process complex workpieces such as denture,this thesis studies the selection of denture curve and interpolation algorithm.Starting from the demand analysis of denture processing,this thesis studies an interpolation algorithm of NURBS curve with adaptive step size,and studies an interpolation algorithm of NURBS curve with adaptive step size,which solves the problem of over cutting caused by too large feed step size and increases the accuracy of the interpolation algorithm.The basic requirement of acceleration and deceleration control is to shorten the starting and braking time as much as possible to improve the production efficiency,and to make the starting and braking process of the production machinery as smooth as possible.Therefore,this thesis presents an adaptive acceleration and deceleration algorithm.According to the relevant information of the curve in the machining path,the position of the deceleration point is calculated by the speed control algorithm,and the reasonable speed planning of the sudden change point of the speed is given.In order to solve the problem of over cutting caused by speed mutation in machining,this thesis further studies the speed prediction problem,and presents an improved S-type algorithm.According to the characteristics of the processing curve,the detection method of the speed mutation point is given,and the reasonableplanning of the feed speed is given in combination with the speed sensitive point discrimination conditions.In order to verify the effectiveness of the algorithm,a machining curve is selected and simulated in Matlab environment.The results show that the speed change of the improved S-type algorithm is more smooth and more suitable for the complex curve of denture machining.On the basis of theoretical research,this thesis uses Visual Studio 2017 software platform to design and develop the interface of denture machining cam system based on MFC function class library,preliminarily realizing the function of forming parameter curve and automatically generating NC code.