第42卷第9期 Vol. 42No. 9
压技
FORGING & STAMPING TECHNOLOGY
热轧厚板件冲压成形与回弹分析
彬毛牛
张亚岐，穆传坤，王
周海龙，
安，院楹妍
（东风汽车公司技术中心，湖北武汉430058）
2017年9月 Sep-2017
摘要：考虑到热轧厚板的材料力学性能、成形方式和板材精度均与薄板存在一定差异，且常用冲压分析软件无法准确模拟厚板成形与回弹，因此，以某车型纵桑为例，采用Autofom，Dynaform以及MARC进行成形与回弹仿真分析对比，依据分析结果判定何种软件更适合热轧厚板冲压伤真分析。首先，分析厚板成形特点以及与薄板的差异性，梳理出3种软件分析厚板时的差异；其次，通过3种软件对同一纵梁外板进行模拟分析对比。为获得真实可靠的实测值，成形前在板料上利用激光绘制基圆，依据成形后基圆尺寸变化计算主次应变，并选取断面及检测点，测量回弹尺寸与厚度变化，与3种软件分析结果进行对比。结果表明：MARC的实体单元对厚度和主次应变分析最为准确；对于回弹，Dynaform计算更为准确，Autofom和MARC 回弹结果均与实测值产生较大偏离。
关键词：热轧厚板件；冲压成形；回弹；主次应变；Autoform；Dynafom；MARC DOI: 10. 13330/j. issn. 1000-3940. 2017. 09, 010
中图分类号：TG386.1
文献标识码：A
文章编号：1000-3940（2017）09-0051-06
Analysis on stamping and springback of hot rolled thick plate Zhou Hailong,Zhang Yaqi,Mu Chuankun,Wang Bin,Mao An,Ruan Yingyar
( Technical Center of Dongfeng Motor Corporation, Wuhan 430058 , China)
Abstract : For the certain differences of mechanical properties, forming type and dimensional aceuracy between hot rolled thick and thin blank and difficulties in accurate simulation on the forming and springback of thick plate by common sheet stamping analysis sofhware, the fonming characteristics and springhack of the vehicle longitudinal beam were analyzed and compared by Autoform, Dynafom and MARC, and the software which is more suitable for thick plate simulation analysis was selected. Firstly , thick plate forming characteristics and the differences were analyzed by the three kinds of software. Secondly, their longitudinal beam simulation results were analyzed and compared respectively. In order to obtain true and authentic measured values, base circle on sheet metal before foming was drawn by the laser, then the primary and secondary strain was detemined based on the changing size of base cirele. Finally, the corresponding section and check points were selected, the springback and thickness change were measured, and their results were compared by three kinds of sofhware. The results show that the thickness and primary and seeondary strain analysis can be obtained precisely by the physical unit of sofwarc MARC, and the springhack can be gained more precisely by software Dynafom.
However, the springhacks deriated from the measured
values largely by software MARC and Autoform.
Key words : hot rlled thick plate; stanmping forming; springhack ; primary and secondary strain; Autofoma; Dynaform; MARC
随着CAE仿真技术的发展，相继出现了众多冲压分析类软件，如Autoform、Defom、！
Dynaform
PAM-STAMP、JSTAMP、PRO/MECHANICA、ALGOR、 ROBUST、MARC等[1-5)，这些软件在成形缺陷分析和工艺方案布置与优化方面具有可操作性强、计算时间快、结果变量可方便查阅等优点。
但由于薄板
类与厚板类零件在成形方面存在一定差异，
传统的
收稿日期：20170405；修订日期：20170701 作者筒介：周海龙（1989－），男，学土，高级工程师
万方据ail：zh6541234@163.oom
分析软件对薄板件分析较为准确，但对厚板件分析结果并不准确，因为在相同弯曲半径下，厚板具有更小的弯曲半径厚度比（半径/厚度），当该比值小到一定程度时，零件表现为三向应力状态，此时若采用壳单元仿真显然是不合适的，而传统的冲压分析软件一般将板料当作壳单元处理，其分析结果很难达到预期。
厚板件结构简单，一般以伸长类或压缩类翻边为主，其成形缺陷主要是裂纹与回弹，相对于薄板，厚板件缺乏统一的失效判定准则和分析规范，且回弹计算没有明确的方法。现有回弹计算分析方法并