Study On Four-Anvil Reducting Auxiliary Tool And Mathematical Model Of Automatic Reduction

In this paper, based on the analysis of a variety of commonly used drawing out methods and technique equipments in the workshops, from the stretching efficiency, size precision forgings and forging defects in favor of the establishment of combined stress state, etc., four-anvil stretching auxiliary tool technical parameters are determented, as well as the working principle and structural designing of a four-anvil Des stretching are put forward. Applied UG three-dimensional modeling software, a three-dimensional solid model is established and the mesh is divided, then introduct into finite element software "MARC" to analyze the maximum stress and deformation while the auxiliary tool is working. And ultimately a reasonable design is determined. Its drawing efficiency is higher than a flat anvil or a up-down form V-anvil. What's more , the forging's block dimensional accuracy is only second to the forging machine, and the hydrostatic stress in the center of a forging stress is very high. So a part of foundations can be achieved in the tradtional common press forging machine which is close to the precision forging machineA large number of forging hydraulic press machines are made in our country in recent years, most of which have automatic foundation. This foundation may greatly improve the productivity of stretching. More than a hundred years, manual stretching operation has never been faced with technical problems, has never been proposed to the demand for establishing the calculation length of roundsteel and the mathematical models of reduction anvil. However, facing the automatic forging which is not rely on human intervention, these problems make the automatically making not come true. In this paper, based on the theory of orthogonal experimental design and also using the three-dimensional numerical simulation software Deform, the deformation process of the flat and four anvils auxiliary tool stretching is numerically simulated, and then acorrding to the simulation results, through the least square method, various flat and four anvils auxiliary tool stretching mathematical models are established. The models can predict the length of the blank and the stretching anvils after stretching. Then it provides the theoretical model for automatic drawing programming so that automatic drawing can be possible. The experimental results verify the correctness of the mathematical model. This work has important application value.