CAJ | 학술논문

为了控制矩形管绕弯成形的回弹和截面变形，建立考虑压块力、速度加载条件的回弹和截面变形有限元预测模型，并对其可靠性进行实验验证。基于所建模型研究压块的摩擦因数、夹持压力和助推速度对H96矩形管回弹与截面变形的影响规律。结果表明：摩擦因数和夹持压力越大，回弹角和横截面高度变形越小。但压块对横、纵截面畸变的作用完全相反；芯头支撑区域内助推速度的变化能够影响回弹量，且不会加剧截面变形。提出变助推速度的压块边界条件组合方案，实现了弯曲角度小于90°和大于等于90°弯管的回弹量分别降低55.31%和36.45%，60°弯管的高度变形量平均降低1.79%，90°和120°弯管的高度变形量最大分别降低5.98%和6.35%。
위료공제구형관요만성형적회탄화절면변형，건립고필압괴력、속도가재조건적회탄화절면변형유한원예측모형，병대기가고성진행실험험증。기우소건모형연구압괴적마찰인수、협지압력화조추속도대H96구형관회탄여절면변형적영향규률。결과표명：마찰인수화협지압력월대，회탄각화횡절면고도변형월소。단압괴대횡、종절면기변적작용완전상반；심두지탱구역내조추속도적변화능구영향회탄량，차불회가극절면변형。제출변조추속도적압괴변계조건조합방안，실현료만곡각도소우90°화대우등우90°만관적회탄량분별강저55.31%화36.45%，60°만관적고도변형량평균강저1.79%，90°화120°만관적고도변형량최대분별강저5.98%화6.35%。
In order to control springback and section deformation of rotary-draw bending of rectangular tube, the finite element model for springback and sectional deformation prediction, which considers the loading and velocity conditions of pressure die, was established and verified by experiment. Based on the model, the impact of friction coefficient, pressure and boosting velocity of pressure die on springback and section deformation of H96 rectangular tube was investigated. The results show that the larger the friction coefficient and the clamping pressure are, the smaller the springback angle and the cross-section height deformation are. However, the impacts of pressure die on deformations of cross-section and longitudinal-section are completely opposite. The change of boosting velocity within core-filled area can influence the springback amount, while not exacerbate section deformation at the same time. Then, the combinations of pressure die boundary conditions of variable boosting speed were proposed. And by which, it is realized that springback angles are decreased by 55.31%and 36.45%, respectively, for bent tubes smaller than 90° or no less than 90°. The cross-section height deformations are reduced by 1.79%for 60° tube on average, and 5.98%and 6.35%, respectively, for 90° tube and 120° tube at most.