Research On The Bending Process Of A Coupler Yoke Key Process

Coupler yokes as the train passed important parts of its strength and reliability andmore attention. In recent years, domestic manufacturers gradually Coupler yokes usesforging process instead of the traditional casting process. Coupler yokesbecause withthin-walled, deep cavity, heterosexual macroporous structure is characterized bylarge-scale long axis of forging Coupler yokes forming process more difficult, in orderto enable the forging process and to the maximum extent feasible to reduce energyconsumption, currently forged Coupler yokes process is the use of the frame and thenbending to start forging process, followed by the use of welding processes at both endsof the head and neck with a forged connecting plate13B type coupler yoke consists oftwo ends, two connecting plates and middle bulk. The connecting plates have theminimum size in height direction. And the cross sections along longitudinal directionare quite different. To decrease the force in die forging, forming roll forging process, inwhich the connecting plate is completely formed to the required dimension, is designed.And then the ends as well as the middle bulk of the part will be formed in die forgingprocess.As domestic to develop in the direction of high speed overloaded railway wagon,hook tail frame fracture trend is upward trend. Analysis of the causes is forging defectsand material fatigue is the main cause of forging hook tail frame fracture, this is becausein the forging process prone to defects such as porosity, sand holes, slag greatly reducethe intensity of coupler yokes.Thus under the impact load of big hook tail box servicelife is lower than the design life. In order to improve the actual service life of thecoupler yokes, in this paper, the forging coupler yokes is optimized, the first use ofcoupler yokes process was analyzed, and the analysis of the fatigue life of breakdownpoint; Thus targeted to the forging hook tail frame is optimized. Paper main contents areas follows:①According to coupler yokes products offered by a factory, hook tail framestructure analysis model is established, the fatigue life analysis was carried out on thecoupler yokes. The static strength analysis, coupler yokes set position in the processof using stress mainly appears in bend anglecoupler yokes; At the same time, thefatigue life analysis of the fatigue life of the lowest, too.②In the hook tail frame based on the analysis of fatigue life, USES numerical simulation to analyze the existing factory forging coupler yokes manufacturing process,finally determines the optimization of die forging and bending process as the keycoupler yokes product quality improvement process.③Bending in die forging process for process thickening of the problems, combinedwith the numerical simulation analysis of the formation mechanism and put forward thethree different types of process optimization, contrast analysis of bending Angle inchange of the thickness of the optimization process is finalized, and the trial production④On the basis of analyzing the domestic bending process, according to the factoryexisting defects such as bending process appear strain set up three-dimensional finiteelement model, the initial bending analysis, it is concluded that the initial bendingengineering under bending load are prone to the root of the big, serious loss andbending Angle of the thinning and other serious problems affecting the quality of thecoupler yokes, put forward the new type of bending process, and combining theresponse surface analysis method, the multi-objective collaborative optimization and theapplication of the optimized process parameters to the factory productionThrough this topic research, solve the13b clasps propeller seriously restrict thetail box poor product quality improve the bending roots forming problems, effectivelyimprove the quality of the product, bring considerable economic benefits. At the sametime, the paper’s research results for other types of parts quality improvement to providereference for design, accelerate the coupler yokes forging technology developmentand application.