Galling mechanism in metal forming process with TRD coated die against advanced high strength steel sheet

Galling mechanism in metal forming process with TRD coated die against advanced high strength steel sheet
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采用 TRD 涂层模具对先进高强度钢板进行金属成形过程中的拉毛机制

DOI:
10.1016/j.proeng.2017.10.987
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发表时间:
2017
期刊:
Procedia Engineering
影响因子:
--
通讯作者:
Zhigang Wang
Zhigang Wang
中科院分区:
其他
文献类型:
--
作者:
Wenzheng Dong;Ling Xu;Junjie Wen;Qiquan Lin;Zhigang Wang

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先进高强度钢(AHSS)板料成形过程中的剥落行为是汽车制造业十分关注的问题。为研究板材成形中的粘扣机理,采用有限元分析和U形弯曲试验,对采用热反应扩散工艺(TRD)涂覆VC涂层的模具与DP 780板材进行了粘扣试验。结果表明,划痕首先出现在模具圆角表面,主要分布在0-10°和30-50°。随着成形次数的增加,磨损机制由粘着磨损转变为磨粒磨损,并伴有粘着瘤和磨屑。TRD涂层模具表面的Ry从0.481μm增加到3.44μm,工件表面的Ry从0.718μm增加到6.82μm。有限元分析预测的磨损深度与实验结果吻合较好。
Galling behavior in sheet metal forming of advanced high strength steel (AHSS) is of great concern in automobile industry. To examine the galling mechanism in sheet metal forming, Finite element analysis and U-bending test with VC coating die coated by thermo-reactive diffusion process (TRD) against DP780 sheet were carried out. The results show that scratches are firstly observed on the die radius surface, mainly distributed at 0-10°and 30-50°. As the forming number increases, the galling mechanism changes from adhesive wear to abrasive wear, accompanied by adhesive tumors and debris. The Ry increases from 0.481μm to 3.44μm for TRD coated die surface and from 0.718μm to 6.82μm for workpiece, respectively. The wear depth predicted by finite element analysis agrees with the experimental result.
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