CAJ | 학술논문

以经过拉深筋变形后板材后续冲压成形性能为研究对象，通过对板材后续成形性能特征及变化规律进行系统的研究，分析拉深筋主要结构参数对板材后续成形性能的影响，揭示了板材经拉深筋变形产生的等效预应变量与板材后续成形性能的关系。研究表明，板材后续屈服强度大于毛坯板材的屈服强度，当等效预应变小于一定值时，后续强度极限小于毛坯板材的强度极限，相应可以确定硬化指数 n值及板厚方向性系数 r ；当等效预应变较大时，后续强度极限大于毛坯板材的强度极限，n值及r值无法确定。
이경과랍심근변형후판재후속충압성형성능위연구대상，통과대판재후속성형성능특정급변화규률진행계통적연구，분석랍심근주요결구삼수대판재후속성형성능적영향，게시료판재경랍심근변형산생적등효예응변량여판재후속성형성능적관계。연구표명，판재후속굴복강도대우모배판재적굴복강도，당등효예응변소우일정치시，후속강도겁한소우모배판재적강도겁한，상응가이학정경화지수 n치급판후방향성계수 r ；당등효예응변교대시，후속강도겁한대우모배판재적강도겁한，n치급r치무법학정。
The subsequent stamping formability of the plate after pre‐deformation via the drawbead was studied .The characteris‐tics and variation rules of the subsequent forming formability of the plate were investigated by experiments .The influence of the main structural parameters of drawbead on the subsequent forming quality of the plate was analyzed .The relationship between the equivalent pre‐strain of the sheet after the drawbead deformation and subsequent forming formability of the plate was revealed . The results showed that the subsequent yield strength of the plate is greater than yield strength of the plate blank .When the e‐quivalent pre‐strain was less than a certain value ,the subsequent ultimate strength was less than the ultimate strength of the plate blank ,and the corresponding hardening exponent n and directionality coefficient of plate thickness r can be determined .When the equivalent pre‐strain was larger ,the subsequent ultimate strength was larger than the ultimate strength of the plate blank ,and the corresponding n and r were difficult to be determined .