Study On Key Components And Its Dynamic Properties Of The Tangential Point Tracing Crankshaft Grinder

With the development of machine tools toward higher production efficiency, higher accuracy and automation, its structure and dynamic performance has become one of the key factors which influence the workpiece’s quality. Today the research of dynamic performance occupies an important place in designing and manufacturing new type machine tools. Building the model of key components and whole machine by FEM, and then, optimizing the structure of key components and whole machine is very important for improving the structure dynamic capability and machining precision of new machine tools. Numerical control crankshaft grinding machine as the work master of crank is desired to be possessed of reasonable structure and dynamic capability.Aiming at improving the stiffness and avoiding resonance of the structures, we carry out the dynamic analysis for the numerical control crankshaft grinding machine from two aspects respectively, that is, the key components of grinder and the whole machine, and upon which relative structural improving designs have been researched.Firstly, the static and dynamic performance of the bed and head frame box of the crankshaft grinding machine is analyzed using FEM with the aim of getting the weaknesses of the key parts and whole machine, then, the structure optimization to find out the weaknesses is done by the method of program comparison.The results showe that:we can optimize the structure of the bed and the box of head frame to improve the dynamic performance without changing the dimensions of the premise parts; the distribution of bed pad will affect the frequency of the bed.Secondly, we calculate the stiffness and damping of grinding machine junctions, and then, the finite element model of the machine was created, after that, modal analysis was done. The results showe that:the table’s stiffness, the bed and table junction’s stiffness, and the bed and vertical slide junction’s stiffness need to be improved.Finally, the spectrum test of grinder bed has done, the test result have shows that the experimental test frequency of the bed is compared with simulation results, which verifies the correctness of the bed structural optimization. The result of static and dynamic analysis and optimization programs will provide a guideline for research the dynamic performance of the crankshaft grinding machine and have some reference value for design and structural optimization of the crankshaft grinding machine.