Improved seizure resistance of ultra-high-strength steel ironed cups with a lubricant containing SiO2 nanoparticles

• Main Authors: Tan, C.J., Aslian, A., Abe, Y., Mori, K.
• Format: Article
• Published: Springer Verlag (Germany) 2016
• Subjects: TJ Mechanical engineering and machinery
• Online Access: http://eprints.um.edu.my/17819/; http://dx.doi.org/10.1007/s00170-016-8588-2
• Institution: Universiti Malaya

Good boundary lubrication is necessary during cold stamping of high-strength steel sheets to prevent die wear and seizure of the parts owing to the high contact pressure. This study is aimed to improve the seizure resistance in a 1-step combined process of deep drawing and ironing of ultra-high-strength steel cylindrical cups using a commercial lubricant containing SiO2 nanoparticles with an uncoated die. In this study, the extreme pressure performance of the lubricant containing 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 wt% of SiO2 was first evaluated using a deep drawing process under increased blank holding forces. The optimum concentration of SiO2 was determined, i.e. 2 wt%, based on successful drawing of cups having smooth surfaces under the highest holding force. Then, the ironing limits of the cups for the lubricants containing 0 and 2 wt% of SiO2 respectively were investigated with the 1-step combined process under increased ironing ratios. The experimental results showed that seizure was observed for the lubricant containing no nanoparticles at an ironing ratio of −16.7 %. However, no seizures were observed for ironing ratios up to 4.2 % using the lubricant containing 2 wt% of SiO2. The resistance to seizure of the cup was significantly increased, leading to the formation of cylindrical cups having smooth surfaces and uniform side wall thickness.