The Design And Simulation Of 1250 Tons Generalized Elbow-bar Cold Forging Press

Cold forging has higher productivity and material utilization, products have highquality and accuracy, suitable for mass production, can be as a near Net-shape Forming,has its application prospect. Cold forging precision forming equipment and technology inour country are relatively backward, basically depend on import. Therefore, 1250 tonscold forging press developed by ourself has important theoretical and practicalsignificance.Elbow-bar mechanism is very suitable for the technical requirements of cold forgingprocess. The design of rods dimension has a direct effect on the performance of press.Research dimension and error of elbow-bar structure affected to performance of slider, andanalyze the appearance of self-locking. For the effect of clearance of motion pair on theperformance of slider, design parts of balance cylinder. Study on balancing loads andcompare plans of balance cylinder under different arrangements. To calculate thereliability of major loaded parts and estimate the system reliability of cold forging press.To establish the three-dimensional model of 1250 tons elbow-bar press, virtualprototype technology was applied to analysis. At first the generalized elbow-bar linkagestructure with negative bias which is used in the press was analyzed, and got the concreteimpact coefficient of dimensional change on performance of slider. The effect of rodslength error on the slider lower dead position accuracy was analyzed, according toanalysis results the selecting principle of dimensional precision is obtained. For elbow-barpress, the whole stroke of slider and effective stroke are all large, the slider at the upperdead position may be engender self-locking, analyzed the strength situation of slider.Some improvements were proposed for the structure. The analysis results of improvedstructure showed that the loaded condition and the movement stability of the slider havebeen improved significantly, and the improved structure can meet the work requirements.The impact of clearance of motion pair on the performance of slider was investigated.To decrease or eliminate the impact, parts of balance cylinder that connected with theslider were designed. Based on virtual prototype technology, analysis and simulations ofbalance cylinder were carried out under such conditions as different arrangements, frictions and balancing loads. In accordance with the simulation results, obtained the drivetorques of different balancing loads and its effect on the position and velocity accuracy ofslider, and presented the basis of balance cylinder design and balancing loads selection.The balancing loads of 1250 tons cold forging press could be selected between 1.1 to 1.5times of all parts of slider.The reliability of major forced parts tie rod and pin were calculated, and the systemicreliability of cold forging press was estimated.