Research On Finish Machining Technology Of Crankshaft By Turn-milling

Turn-milling technology has been more and more widely used in industry developed countries nowadays because of its advantage such as high cutting efficiency and good machining precision etc. It's a new crankshaft processing technology to complete most of the finish machining using multiple spindle gang controlled turn-milling only by clamping once. The research on finish machining technology of crankshaft by turn-milling has weightily actual meaning.Technological difficulty lies in the machining of crankshaft rod journal, consequently, mathematic model about orthogonal turn-milling of crankshaft rod journal is established according to the basal vector model. At the same time theoretical roughness including microscopic roundness and macroscopic axial generatrix is given. The movement track simulation system for orthogonal turn-milling of crankshaft surface is developed. Computer simulation for orthogonal turn-milling of crankshaft rod journal is performed. Tridimensional solid model of crankshaft is set up and the numeric control combination program of lathe-mill crankshaft is made. Numeric control machining process simulation is processed. Numeric control program code is obtained by post processed. Orthogonal turn-milling of crankshaft experiment is carried out.Conclusion can be drawn that the surface roughness of crankshaft rod journal by orthogonal turn-milling decreases with the increase of cutting speed, cutter teeth number and equivalent rotate speed ratio between milling cutter and crankshaft workpiece, increases with the increase of crankshaft rotate speed. Eccentric distance influences the surface roughness of crankshaft mainly by affecting surface texture direction and the axial generatrix shape.This research makes it possible to substitute turn-milling that can complete the finish machining of crankshaft only by clamping once for the conventional method of turning or milling semi-finishing with its subsequent grinding finishing processing.