The Research On Dynamics Behavior Of Numerical Control Camshaft Grinding Machine Tool And Its Structural Optimal Design

Along with science and technology rapidly developing, market competition is unprecedented acute. Product renovation cycle is largely abbreviate as well as breed begins from single to multivariate. Numerical control camshaft grinding machine as the work master of auto car and motorcycle's parts is desired to be possessed of reasonable structure and dynamic capability. Building the model of key components and whole machine by the Finite Element Method, and then optimizing the structure of key components and whole machine is very important for the betterment of new machine tool's structure dynamic capability, the advancement of machining precision, the abbreviation of development cycle and the reduction of development cost.Aiming at improving the vibration resistance ability, this paper carries out the dynamic analysis for the MKQ8312 numerical control camshaft grinding machine from three aspects respectively, that is, the key components of grinder, the whole machine and the dynamic testing, and upon which relative structural improving designs have been researched.Firstly, in the paper the FEM is applied to the structure characteristic studies of the head frame axis and based on which intension of head frame axis is checked. Then the structure characteristic studies of key component are carried out and based on which aiming at advancing priority two steps intrinsic frequency as theory foundation and the weak parts of the structures some improving designs are tried and analyzed by comparison method. By analysis it is found out that openings size is an important factor which affects parts'performance; the improvements of ribs position in the structure and the forms of the ribs are the crux of intrinsic frequency increase, which are more important than just increasing the number or the thickness of the ribs; the boundary conditions and some position's special role need to be calculated for the components optimal design, unable to improve them blindness and randomly, otherwise the improvement without any significance.And then whole machine of MKQ8312 numerical control camshaft grinding machine is studied by FEM, mode analysis is carried out, and then its first ten natural frequencies and mode shapes are obtained. By mode shapes we judge machine tool's mostly weak link. The paper carried out improvement of the whole machine by two methods, that is, making each parts'mode frequency detached and enhancing bearing performance. In the process of building the whole machine, especially consider each parts'simplify and joint method, in order to build accurate model.This paper obtains each parts'natural frequencies by adopting dynamic testing, in addition to studies of dynamic analysis by FEM. Then we test and verify finite element model by comparing testing frequencies to calculation frequencies, if equal, the model is right.This paper carries out dynamic analysis and structure improvement based on MKQ8312 numerical control camshaft grinding machine's experience data, which provide reference foundation for the design of high speed grinding machine.