Investigation of the effects of lubrication type, blankholder force and force holding time on the spring-back behaviour for hat-shaped MART steels

IF 1.7 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Ironmaking & Steelmaking Pub Date : 2023-05-01 DOI:10.1080/03019233.2023.2199615

Nuri Şen, Tolgahan Ci̇vek, İrem Yalçin

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Abstract

ABSTRACT In this study, hat-shaped bending experiments have been conducted on MART1200 and MART1400 Ultra-High-Strength Steels (UHSS). To investigate the influence of different lubrication conditions, on the spring-back, three different lubricant types (Graphite, Teflon film and Teflon film + Graphite) have been used in the experiments. A constant 6.5 tons of bottoming force has been applied at the end of the bending stroke and the force has been held on the samples for 0, 10s and 60s to observe the effect of force holding time on the spring-back. In addition, the effect of blankholder force on the spring-back has also been investigated for MART1400 steel. It has been found that the decrease of blankholder force and the friction between the die and sheet interfaces has considerably reduced the spring-back in the sidewalls and flange regions and also lowered the side wall curl. It has been revealed through finite element analysis that the sheet bottom has suffered a larger deformation in lower friction conditions and blankholder forces and caused in the reduction of spring-back.

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润滑方式、压边力和保力时间对帽形MART钢回弹性能影响的研究

摘要本研究对MART1200和MART1400超高强度钢（UHSS）进行了帽形弯曲试验。为了研究不同润滑条件对回弹的影响，实验中使用了三种不同的润滑剂类型（石墨、聚四氟乙烯膜和聚四氟乙烯膜+石墨）。在弯曲行程结束时，施加6.5吨的恒定触底力，并将力保持在样品上0、10和60秒，以观察力保持时间对回弹的影响。此外，还研究了MART1400钢压边力对回弹的影响。已经发现，压边器力和模具与片材界面之间的摩擦力的减小显著地减少了侧壁和凸缘区域中的回弹，并且还降低了侧壁卷曲。有限元分析表明，在较低的摩擦条件和压边力下，板底发生了较大的变形，导致回弹减小。

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来源期刊

Ironmaking & Steelmaking 工程技术-冶金工程

CiteScore

3.70

自引率

9.50%

发文量

125

审稿时长

2.9 months

期刊介绍： Ironmaking & Steelmaking: Processes, Products and Applications monitors international technological advances in the industry with a strong element of engineering and product related material. First class refereed papers from the international iron and steel community cover all stages of the process, from ironmaking and its attendant technologies, through casting and steelmaking, to rolling, forming and delivery of the product, including monitoring, quality assurance and environmental issues. The journal also carries research profiles, features on technological and industry developments and expert reviews on major conferences.