Abstract. Thinning features of 22MnB5 in hot forming process were investigated by simulation of AUTO-FORM on the base of verification of the results in a published paper. The thinning of 22MnB5 in the isothermal forming process was calculated and the effect of temperature on cracking was evaluated. A mathematics model of forming limit, which is called FLE (Forming Limit Equation), is recommended to predict the cracking of the sheet in the hot forming process in stead of FLD (Forming Limit Diagram). And effect of other parameters, i.e. blank holding force, friction coefficient, thickness of sheet and strain rate, was also investigated.
Abstract. The springback of 22MnB5 steel in hot forming was investigated using simulation of AUTO-FORM, and a mechanics model is presented to analysis spring-back. The results show that temperature is key parameter to affect the springback of 22MnB5 steel in hot forming. Raising temperature is effective method controlled the springback in hot forming of 22MnB5 steel. When temperature is below 300℃, the thickness of sheet has influence on the springback. While temperature is over 500℃, the effect of the thickness of the sheet on springback is not significant. Blank holder force, friction coefficient, punch radius, strain rate have little effect on the springback in sheet metal forming for 22MnB5 steel.
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