Dynamics Analysis Of Screw Finger-shaped Milling Cutter And Optimization Of Tool-tooth Profile

Screw pumps have been widely used in the offshore drilling platforms, shipping industry, petrochemical industry and other important fields due to its superior engineering adaptability and economic practicability. However, as screw pump is a high precision mechanical product, and the screw rotor machining depends on the expensive and special import equipments widely, that the screw pump is very expensive, and its application and promotion is limited in many places. Therefore, the paper studies the machining principle of the screw rotor and forming milling process. The main contents of this dissertation are shown as follows:①Aimed at the screw end section which consist of discrete points, by studying the space position relations, geometry features, shape of contact wire in the processes of milling cutter and screw in machining, and propose a new method to solve the finger milling cutter profile based on geometric shape and position. And the result shows that the new method simplifies the solving steps and improves the design accuracy of the screw tooth-shape tool compared the new method with the gear engagement principle.②Using the mechanical modeling method, and establish the integral rigidity milling force prediction model considering the shear effect and plough cutting effect at the same time. Analyze the influence of various parameters on the milling force, as to provide theoretical basis for the optimizing cutting parameters. At the same time, using the finite element analysis software to simulate the milling process, and compared with the numerical results, the results show that the finite element model and mechanics model to calculate the milling force consistent in trends.③Considering the actual impact of the tool deformation process of cutting systems, the processing flexible milling force model is established and analysis the deformation. Combined with iterative feedback calculation method to optimize the milling contour, and appliedthe inverse process of geometric method to solve the screw end face points. The results show that the end face of the tooth precision machined by the modified finger cutter is improved.