1250 Tons Large Travel Cold Forging Press Design And Virtual Prototyping

Cold forging process is a precision plastic forming technology to provide high-quality, low-cost parts. Cold forging precision forming equipment and technology in China is relatively backward, especially for multi-link and large travel automatic mechanical multi-station cold forging presses. Therefore, the research has important theoratical and practical significance.The main transmission system of large travel Cold Forging Presses is designed in this paper, and generalized elbow-bar linkage structure with negative bias is determined as an executive mechanism. Dynamic characteristics and mechanical properties of the mechanism is analyzed, with the target of more compact, fewer consumables and good dynamic properties of the mechanism, we determine the form of gear trassmission and the best gear ratio, design gear structure, and establish a three-dimensional model. According to the features of large-scale forging equipment, combined with engineering experience to design fuselage structure, structure of forging body and three-dimensional model is establishes. An assembly model is built to check the interference and the geometric simulations are complete.Establish a parametic model of generalized elbow-bar linkage structure, and analysis the effect of design parameters to the mechnism displacement and velocity According to the technical characteristics and related parameters of cold forging presses, a virtual prototype is modeled and and its characteristics are simulated, that is, movement of the system performance and dynamic characteristics of the simulation. Establish virtual prototype separately, form the initial virtual product, Simulation results show that the slider stroke is 300mm, nominal power stroke is 25mm. and the slider has obvious quick-return characteristics,and the model is correct.Establish the finite element model of the assembly, anlysis its strength and stiffness, especially focus on major power transmission parts and body. Then a modified structure is imposed based on static analysis results. The results show that the maximum stress of the body is 58.124 MPa, total body deform is 0.306 mm. Analysis of the dynamic modal of the cold forging press assembly obtains the natural frequencies and vibration mode of the mechnism, so the assembly structure and the dynamic performance of the press is improved.