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Friction and Die Wear in Stamping Prephospated Advanced High Strength Steels

机译:冲压灰泥高强度钢冲压摩擦和模具磨损

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Prephosphated steels have been developed by applying the phosphate coating on zinc coated sheet steels to increase the lubricity in the automotive stamping process and adding extra corrosion protection. The prephosphate coating was also found to be able to further absorb the lubricant, which can reduce the oil migration and excessive amount of lubricant dripping on the die surface and the press floor. Due to its enhanced lubricity characteristic, the applications have been expanded to more-recently developed advanced high strength steels (AHSS). Because of the higher strength of AHSS, it is crucial to understand their performance under more extreme forming conditions such as higher die temperature, contact pressure and sliding speed, etc. The intent of this study is to investigate the tribological performance and die wear behavior of prephosphated AHSS in the die tryout and production conditions. In this study a typical hot-dip Galvannealed (GA) coated DP600 with and without prephosphate coatings is selected for the tribological performance study. The bending under tension test and strip draw test were used to evaluate the friction behavior. The Marciniak stretch-forming test and the limiting dome height test were also included to evaluate the formability performance of prephosphated AHSS. In addition to the DP600, a hot-dip Galvanized (GI) coated DP980 with the prephosphate coating was also included in the die wear study. The cyclic bend die wear (CBDW) test system based on the modified bending under tension test was used to investigate the effects of the prephosphate coating on the die wear and zinc coating build-up in the production stamping condition. Results indicated that the prephosphate coating has a stable tribological characteristic in reducing the friction coefficient even at the elevated die temperature, higher contact pressure and higher sliding speed conditions. Also, the prephosphate coating can further reduce the die wear, prevent the zinc coating built-up on the die surface and increase the formability.
机译:通过将磷酸盐涂层施加镀锌板钢上的磷酸盐涂层来开发术术术,以增加汽车冲压过程中的润滑性并增加额外的腐蚀保护。还发现序鞘涂层能够进一步吸收润滑剂,这可以减少模具表面和压力地板上的润滑剂滴水的润滑剂和过量的润滑剂。由于其增强的润滑性特性,应用已经扩展到更新的先进高强度钢(AHS)。由于AHSS的强度较高,在更极端的成形条件下了解它们的性能至关重要,例如更高的模具温度,接触压力和滑动速度等。本研究的目的是调查摩擦学性能和模具磨损行为在模具试用和生产条件下的术蠕虫AHSS。在本研究中,选择典型的热浸镀锌(GA)涂覆的DP600,用于摩擦学性能研究。使用张力试验和条带绘制试验下的弯曲来评估摩擦行为。还包括Marciniak拉伸成型试验和限制圆顶高度测试,以评估术雷磷酸盐AHS的成形性能。除了DP600之外,模具磨损研究还包括一种热浸镀锌(GI)涂布的DP980,其也包括在模具磨损研究中。基于张力试验下的改性弯曲的循环弯曲模具磨损(CBDW)测试系统用于研究静脉膜涂层对生产冲压条件下模具磨损和锌涂层的影响。结果表明,即使在升高的模具温度,接触压力较高和更高的滑动速度条件下,静脉膜涂层也具有稳定的摩擦学特性。而且,静脉涂层可以进一步降低模具磨损,防止锌涂层内置在模具表面上并增加可成形性。

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