Design And Optimization Of Anti-collision Beam Hot Stamping Die

Hot stamping is a kind of new material processing technology. Make uniformaustenitized high temperature steel plate delivered into stamping die with coolingsystem and formed quickly, then hold pressure for a period of time to make itcomplete the martensite phase transformation, forming a greatly increased strengthparts. Hot stamping is mostly used to form stamping parts with strength higher than1500MPa, due to the hot stamping parts have the characteristics of small springbackof forming high intensity and small deformation resistance, etc. It is of greatsignificance for realizing the lightweight of automobile manufacturing, hot stampinghas become a research hotspot in recent years, and being used more and more widely.In this paper, the anti-collision beam hot stamping die is set as the researchobject, put forward the overall design scheme of hot stamping die, and explain eachpart of the die structure. Then choose a module of the die as the research object,selecting22MnB5as the sheet material, study hot stamping process of sheet metal bymethods such as theory analysis and finite element numerical simulation, learn aboutchange of sheet metal in the process of hot stamping. And conclude the influence ofdie design parameters such as concave-convex die fillet、die gap on the forming andquenching quality of hot stamping parts according to the results of simulation, andoptimize these parameters. provide the reference for the selection of hot stamping diesurface parameters in future study. put forward the design scheme of cooling system,study the influence of the water temperature and flow rate on the cooling effect of thecooling system by method of theory analysis and fluid engineering simulation, anddiscuss the influence of cooling system parameters like pipe radius R, pipe walldistance L,vertical distance from the edge of the pipe to the surface of die H parameter selection on the cooling effect to parts according to the results ofsimulation. By this, put forward the cooling pipe arrangement scheme of anti-collisionbeam die module, through the simulation analysis, optimize the initial scheme untilmake cooling system meet the design requirements eventually.Combined with the analysis of hot stamping forming process and quenchingprocess, and comprehensive investigate the influence of die surface parameters andcooling system parameters on hot stamping forming quality and quenching quality.Results show that, when design the hot stamping die general structure, the right diematerial is needed to choose to ensure the effective cooling of the die to parts andthermal stability under high temperature for a long time, As to die with a largergeometry size. in order to make an uniform cooling, die can be divided into moduleswith independent cooling system. at the same time,as the result of the cooling systemexistence in the die design, attention should be given to the setting of the sealingdevice. In hot stamping and quenching process, the medial wall area of sheet metalhas the most serious thinning, the highest temperature and the largest stress. In orderto improve the quality of forming precision and quenching, appropriate die fillet anddie gap parameters should be choosed when make die profile design. The larger diefillet radius，the better sheet metal forming and quenching qualities. Forming effectand specific parts parameters should be considered comprehensively when choose thedie fillet parameter; In order to balance the quality of forming and queching, die gapshould choose1.0t-1.1t advisable. For the design of the cooling system, it isnecessary to make the cooling system satisfy the cooling rate、cooling uniformity anddie thermal balance in the long-term work at the same time. In order to ensure thehigh cooling effect, minimum water flow rate is higher than10.5m/s is needed, selectwater temperature20℃as room temperature. low temperature and high flow of waterrate should be ensured, when choosing the cooling system design parameters, on thepremise of guarantee the die structure strength, larger pipe radius R、smaller pipe walldistance L and vertical distance from the edge of the pipe to the surface of die Hshould be choosed, for a specific die cooling system, after choosing R=5、L=16、H=6parameters Inlet flow velocity is8m/s, the holding quenching time is8s and analysis, carry out R、L、H parameters local adjustment to make the cooling rate more than30℃/s in the area of the martensite phase transformation, maximum temperaturedifference down to9℃after quenching, In long times work，at the end of each cycle，the highest temperature of parts stabile at about131℃and the highest temperatureof die stabile at about120℃，The cooling system meet design requirements.