CAJ | 학술논문

复杂截面型材的高精度拉弯成形是制造汽车门框的关键技术。基于动态显式有限元软件ABAQUS/Explicit，针对一种由SPCD与B250P1拼焊板滚压得到的汽车门框上条型材零件，对其力控制方式的直进台面式拉弯成形进行了数值模拟研究，对比分析了不同预拉力和不同摩擦系数对型材截面畸变的影响程度。结果表明，增加预拉力可以减小截面畸变程度，但当预拉力大于1.3倍屈服强度时，畸变量反而变大，当预拉应力取1.1倍的屈服强度时，整体的畸变量达最小；当摩擦系数为0.08～0.12时，截面畸变量较小，可以得到较好的成形精度。
복잡절면형재적고정도랍만성형시제조기차문광적관건기술。기우동태현식유한원연건ABAQUS/Explicit，침대일충유SPCD여B250P1병한판곤압득도적기차문광상조형재령건，대기력공제방식적직진태면식랍만성형진행료수치모의연구，대비분석료불동예랍력화불동마찰계수대형재절면기변적영향정도。결과표명，증가예랍력가이감소절면기변정도，단당예랍력대우1.3배굴복강도시，기변량반이변대，당예랍응력취1.1배적굴복강도시，정체적기변량체최소；당마찰계수위0.08～0.12시，절면기변량교소，가이득도교호적성형정도。
High precision stretch bending of complex profile parts is regard as the key technology for manufacturing of automobile doorframe. The process of the stretch bending forming with force-controlled for the typical kind of upper strip of automobile doorframe rolled by the tailor welded blanks of SPCD and B250P1 was simulated by ABAQUS/Explicit, the dynamic explicit FEM software; the influence of different pretension and friction coefficient on the cross-section distortion was investigated. The results show that,generally, the cross-section distortion decreases with the increasing of the pretension; however, when the pretension is 1.1 times of the yield strength, the cross-section distortion is the minimum; when the pretension exceeds 1.3 times of the yield strength, the cross-section distortion increases inversely. When the friction coefficient is between 0.08 and 0.12,the value of cross-section distortion is small and the workpieces with high forming precision can be obtained.