CAJ | 학술논문

研究了拼焊板厚度组合、强度组合及成形过程中焊缝移动问题.通过数值模拟技术,建立了有拉延筋和没有拉延筋情况下的有限元模型,分析了不同板厚组合和不同强度组合对拼焊板成形性的影响,同时分析了拉延筋对焊缝移动量的影响,揭示这些因素影响成形性能的一般规律,提出一种减少焊缝移动的方法.研究结果表明:差厚板薄板与厚板的厚度比值取不低于O.5时,有利于成形极限的提高;对于不同强度组合的差厚拼焊板,在无拉延筋时厚板侧选用低强度,在有拉延筋时,薄板侧选用低强度,强度比值不低于3.0时,拼焊板的成形极限趋于基本稳定;在拼焊板的成形过程中,拉延筋能减少强度差对拼焊板成形性的影响,也能减少焊缝的移动量.应用实践表明,诸如汽车后地板类覆盖件零件,沿焊缝垂直方向设计一条加强槛(筋)能有效增加零件刚度和减少焊缝移动.
연구료병한판후도조합、강도조합급성형과정중한봉이동문제.통과수치모의기술,건립료유랍연근화몰유랍연근정황하적유한원모형,분석료불동판후조합화불동강도조합대병한판성형성적영향,동시분석료랍연근대한봉이동량적영향,게시저사인소영향성형성능적일반규률,제출일충감소한봉이동적방법.연구결과표명:차후판박판여후판적후도비치취불저우O.5시,유리우성형겁한적제고;대우불동강도조합적차후병한판,재무랍연근시후판측선용저강도,재유랍연근시,박판측선용저강도,강도비치불저우3.0시,병한판적성형겁한추우기본은정;재병한판적성형과정중,랍연근능감소강도차대병한판성형성적영향,야능감소한봉적이동량.응용실천표명,제여기차후지판류복개건령건,연한봉수직방향설계일조가강함(근)능유효증가령건강도화감소한봉이동.
The different strength combination and different thickness of materials play important role in the formability of tailor-welded blank (TWB).With bead and without bead separately,the formability of tailor.welded blanks square cup is analyzed by nulneric simulation teehnology in different conditions:different thickness and different strength combination of TWB's materials.Also.the affect of the draw bead on the displacement of weld-line is investigated.Further,the laws influencing the formability of controlling tlle thickness ratio of two blanks up to more than 0.5,choosing lower strength material for thicker blank in condition without bead and for thinner blank in condition with bead,and reducing the difference of thickness between two blanks can improve the foming capability of TWB and vice versa.Draw bead can reduce the influence of strength difference on forming performance and also reduce the displacement of weld-line.Practice shows that designed a draw bead at the direction perpendicular tO weld-lime can improve the stiffness of front floor board part and reduce the displacement of weld-line.