There are various forms of joints in a machine tool, which have a high influence on the whole machine's static and dynamic behavior. Therefore the effect of the joints' features must be taken into consideration when establishing the overall kinetic model of a machine tool. Based on the forms of typical joints, the factors influencing the joint features are analyzed, and are classified into the factor of material, structure and application conditions; the expressing methods of the characteristic parameters for joints are presented for different sections based on the experimental results of joint features. During the establishment of the overall model for the machine, the characteristic parameters of joints are taken as known conditions, are equivalent to the connection rigidity and connection damp between structures, and added into the rigidity matrix and damp matrix of the dynamics model. The overall dynamics model of the machine generated therefrom covers the features of joints, and can more accurately predict the static and dynamic behavior of the whole machine. The correctness and effectiveness of the method is verified by the modeling and calculation of XK712B vertical boring and milling machine and comparing with the experimental results. With the method, it is possible to predict the static and dynamic behavior of the whole machine at the phase of drawing design.
In this paper the clamping moulding tail plate of a large die casting machine, which is the key component of clamping mechanism, was studied through variable density topology method based on SIMP to achieve weight reduction. Virtual prototype of the clamping mechanism was firstly developed. The actual load on the tail plate was simulated through multibody dynamic and the strength of the original structure was calculated and verified using Finite Element Analysis. Together with the consideration of actual manufacturing issues two optimization models were built up. Two topology optimizations of the models were carried out by setting optimized parameters and based on the cell density contours the final optimized structural models were designed. After the optimization, the weight was reduced by 4.42 tones with the ratio of 17.9%. Results showed that the new designs were significantly improved regarding economic and manufacturability and it is a guideline for lightweight design of other equipment.
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