Research On Finish Machining Technique Of Parallel Indexing Cam Profile

Processing methods of parallel indexing cam profile have been analyzed. Manufacturing cam profile with CNC milling center has many advantages, such as high efficiency, high precision and so on. So this kind of machining method is an ideal way to get cam-profile finishing surface.The surface's equation of parallel indexing cam profile has been derived and analyzed by applying isometric curve theory and relative motion method. Conditions without interference are derived. It follows from the analysis of kinemics that angular speed and angular displacement of quasi-cosine rotation output are similar with those of Gutman's output. There exists distinguished difference between the changing regulations of angular acceleration during a period of rotation cycle. The angular acceleration of Gutman's output is continuous, while the angular acceleration of quasi-cosine is uncontinuous.The discretization theory has been used to create cutting force model. Cutting force model of element established firstly, and then the cutting force formula of milling with flat end cutter is got. The cutting force coefficients in the formula were identified through the test. The cutting force model about linear feed movement was established. Research on the impact of cutting parameters on cutting force through the orthogonal test, the increase of axial depth of cut, radial depth of cut and feed rate cause the cutting force increase, while the increase of cutting rate causes the cutting force decrease. Cutting force model of parallel indexing cam profile was established through using coordinate transformation theory. Results of the simulation show that, the milling force is continual change in manufacturing process, it's not only influenced by milling parameters, but also related with the shape of curve.During dynamics analysis, machining system has been simplified to the workpiece subsystem and tool subsystem. Cutting point is the boundary of subsystems, which are coupled each other by cutting force at the cutting point. Dynamic equations of subsystems have been established. Based on the cutting force model and the dynamic model, the error model of the parallel indexing cam profile has been established, and the simulation has been done. It follows from error model that the increase of axial depth of cut, radial depth of cut and feed rate cause the error increase, while the increase of cutting rate causes the error decrease.Finish machining technique of parallel indexing cam profile has been established. Through processing examples, the feasibility of finish machining technique and the correctness of error model have been identified.