CAJ | 학술논문

为实现21-6-9高强不锈钢管数控弯曲精确成形，提高其成形质量与成形极限，需要对弯曲过程中壁厚减薄进行有效控制。基于 ABAQUS/Explicit 有限元软件平台，建立了21-6-9高强不锈钢管数控弯曲三维弹塑性有限元模型，并对其可靠性进行了验证。通过有限元模拟和正交试验，研究了工艺参数对21-6-9高强不锈钢管数控弯曲壁厚减薄影响的显著性及规律。结果表明，影响壁厚减薄的显著性工艺参数依次为芯棒伸出量、管材与芯棒间隙、管材与防皱块摩擦因数、管材与芯棒摩擦因数、管材与压块摩擦因数和弯曲速度，其影响规律为：壁厚减薄率随着芯棒伸出量、管材与防皱块摩擦因数、管材与芯棒摩擦因数、管材与压块摩擦因数、弯曲速度的增大或管材与芯棒间隙的减小而增大。采用多元线性回归方法建立了最大壁厚减薄率与显著性工艺参数之间的回归预测模型，经对比验证，回归预测模型结果与正交试验结果之间的相对误差不超过5%。
위실현21-6-9고강불수강관수공만곡정학성형，제고기성형질량여성형겁한，수요대만곡과정중벽후감박진행유효공제。기우 ABAQUS/Explicit 유한원연건평태，건립료21-6-9고강불수강관수공만곡삼유탄소성유한원모형，병대기가고성진행료험증。통과유한원모의화정교시험，연구료공예삼수대21-6-9고강불수강관수공만곡벽후감박영향적현저성급규률。결과표명，영향벽후감박적현저성공예삼수의차위심봉신출량、관재여심봉간극、관재여방추괴마찰인수、관재여심봉마찰인수、관재여압괴마찰인수화만곡속도，기영향규률위：벽후감박솔수착심봉신출량、관재여방추괴마찰인수、관재여심봉마찰인수、관재여압괴마찰인수、만곡속도적증대혹관재여심봉간극적감소이증대。채용다원선성회귀방법건립료최대벽후감박솔여현저성공예삼수지간적회귀예측모형，경대비험증，회귀예측모형결과여정교시험결과지간적상대오차불초과5%。
To realize the precise NC bending and improve the forming quality and forming limit of 21-6-9 HSSST,which needed to control wall thinning effectively.A 3D elastic-plastic finite element model of NC bending process of the 21-6-9 HSSST was established based on the platform of ABAQUS/Explicit,and its reliability was validated.The influence significances and laws of process parameters on wall thinning of the 21-6-9 HSSST NC bending were studied by finite element simula-tion and orthogonal tests.The results show that the significant factors from high to low are the man-drel protrusion length,the clearance between tube and mandrel,the friction between tube and wiper die,the friction between tube and mandrel,the friction between tube and pressure die and the bending speed.Wall thinning becomes large with increasing of the mandrel protrusion length,the friction be-tween tube and wiper die,the friction between tube and mandrel,the friction between tube and pres-sure die and the bending speed.While the wall thinning decreases with increasing of the clearance be-tween tube and mandrel.Moreover,the prediction model between the maximum wall thinning degree and significant process parameters were established by multi-linear regression method.Compared with orthogonal test results,the relative error is less than 5%.