CAJ | 학술논문

目的：利用充液成形工艺成形普通拉深工艺难成形的大拉深比筒形件。方法通过理论公式计算了冷冲压工艺成形该制件的道次,利用有限元软件Dynaform对充液成形过程进行了3个步骤模拟,并研究了第1步拉深时初始反胀高度对成形制件减薄率的影响规律。结果利用理论公式计算,传统冲压方法成形拉深比为3.2的筒形件至少需要5个道次,而采用被动式充液成形方法只需要3个道次。每个道次的最大减薄率都在8%以内,最后得到拉深制件的最大减薄率为8.53%,在安全范围以内；第1步充液拉深时,反胀高度分别为1.75,2.75,3.75,4.75,5.75 mm时,得到制件的最大减薄率分别为5.28%,5.08%,4.8%,5.03%,5.03%。结论充液成形工艺较传统冲压工艺可以大大提高板料的成形极限,减少成形道次,成形制件质量好；合适的初始反胀高度,可以减小成形制件壁厚的最大减薄率。
목적：이용충액성형공예성형보통랍심공예난성형적대랍심비통형건。방법통과이론공식계산료랭충압공예성형해제건적도차,이용유한원연건Dynaform대충액성형과정진행료3개보취모의,병연구료제1보랍심시초시반창고도대성형제건감박솔적영향규률。결과이용이론공식계산,전통충압방법성형랍심비위3.2적통형건지소수요5개도차,이채용피동식충액성형방법지수요3개도차。매개도차적최대감박솔도재8%이내,최후득도랍심제건적최대감박솔위8.53%,재안전범위이내；제1보충액랍심시,반창고도분별위1.75,2.75,3.75,4.75,5.75 mm시,득도제건적최대감박솔분별위5.28%,5.08%,4.8%,5.03%,5.03%。결론충액성형공예교전통충압공예가이대대제고판료적성형겁한,감소성형도차,성형제건질량호；합괄적초시반창고도,가이감소성형제건벽후적최대감박솔。
ABSTRACT:The sheet hydroforming process was used to form the Tube workpiece with big deep drawing ratio, which is difficult to form by the ordinary deep drawing process. The forming steps of the part using traditional deep drawing process were calculated by theoretical equation. The three steps of the hydroforming process were simulated by means of the finite element software Dynaform, and the impact of initial inverse bulging height on the part thinning rate in the first step was studied. Results At least five steps were needed to form the tube workpiece with a drawing ratio of 3. 2 using traditional stamping as calculated by the theoretical equation, while only three steps were needed with the passive hydroforming process. The maximum sheet reduction of every step was less than 8% and the maximum sheet reduction of the final part was 8. 53%, so it was within the safe range. In the first step of the hydroforming process, when the inverse bulging heights were 1. 75,2. 75,3. 75,4. 75 and 5. 75 mm, the part’s maximum thinning rates were 5. 28%,5. 08%,4. 8%,5. 03% and 5. 03%, respectively. The forming limit of the sheet was improved by the hydroforming process compared with the tradition-al deep drawing process, the number of the forming steps was reduced and the part quality was good. The maximum thinning rate of the part wall thickness could be effectively decreased by using an appropriate initial inverse bulging height.