Determination Of Cone Grinding Parameters And Measuring Of Geometric Angle On Twist Drill

Twist drill has the hundred years history, which is the common machining tool of hole, grinding of drill bit is a quite important step in producing and using process. In the theory of grinding, cone grinding method is one of the best effective methods and also applied widely.Cone grinding method is classified into inner cone grinding and external cone grinding according to its mechanism. The paper analyses the relationships among grinding parameters on the base of mathematical model of cone grinding method, and compiles the electronic closed graph of cone roof distance A and eccentric distance e based on the development environment of LabVIEW Software, we can get the values of A, e of relief angle and oblique of chisel edge in the range of critical value and their corresponding values when we set the parameters of the nominal diameter of drill bit, half cone angle and so on. This closed graph is suitable for the selection of parameters of internal and external cone grinding methods, then getting the best grinding parameters by multiple objective function optimizations.Grinding allowance has great effect on geometric angle of drill bit in the process of grinding or grinding once more. In the paper, based on the principle of cone grinding method, the equations of relief angle of grinding allowance and oblique of chisel edge are derived. Based on the principle of inner cone grinding, the author designs a virtual prototype of inner cone grinding machine, and puts forward the method of realizing a new helicoids grinding in its mechanism and verifies the feasibility of helicoids grinding by mechanism simulation function of PRO/E Software.This paper deduces equations of the end section of twist drill and compiles the programs by the research on twist drill's rake face, and then puts forward a more effective method for 3D modeling of twist drill and the design of machining tool.Geometric parameter measuring of twist drill is a necessary means to detect the results of grinding. In this paper, after considering the accuracy of measuring, efficiency and economy, the camera and computer are employed to make the pretreatment, edge detection and image measurement for the image of twist drill by means of development environment of graphic language of LabVIEW Software and software's compiled by IMAQ Vision Image Processing toolkit. The system software with modular designed, which has excellent reliability, maintainability and expansibility.