Evaluation of stamping lubricants in forming advanced high strength steels (AHSS) using deep drawing and ironing tests |
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| Authors: | Hyunok Kim Taylan Altan Quingguang Yan |
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| Affiliation: | 1. Mechanical Engineering Department, Industrial Engineering Faculty, University of Castilla-La Mancha, 02071 Albacete, Spain;2. Regional Developmen Institute, Material Science and Engineering, University of Castilla-La Mancha, 02071 Albacete, Spain;1. Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 291 Dahak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea;2. Korea Institute of Material Science, 797 Changwon-daero, Seongsan-gu, Changwon-si, Gyeongsangnam-do, 51508, Republic of Korea;1. Institute for Frontier Materials, Deakin University, Geelong, VIC 3217, Australia;2. School of Engineering, Deakin University, Geelong, VIC 3217, Australia;1. University of Waterloo, 200 University Ave West, Waterloo, Ontario, Canada;2. Dana Power Technologies, Mississauga, Ontario, Canada;1. AC²T research GmbH - Austrian Center of Competence for Tribology, Viktor-Kaplan-Straße 2 D, 2700 Wiener Neustadt, Austria;2. Division of Machine Elements, Luleå University of Technology, Luleå SE-971 87, Sweden |
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| Abstract: | In forming AHSS, the lubricant must reduce the friction between die and sheet as well as the effect of heat generated from deformation and friction, especially in forming at high stroking rates. In this study, the effectiveness of stamping lubricants was evaluated by using the deep drawing and ironing tests. Various stamping lubricants were tested in forming of DP590 GA round cup samples. In these tests, the performance of lubricants was ranked via evaluation criteria that include punch force and the geometry of tested specimens. Deep drawing tests were conducted at two different blank holder forces, BHF (30 and 70 ton) at a constant ram speed (70 mm/s). The ironing tests were conducted to evaluate the performance of lubricants at higher tool–workpiece interface pressure than that is present in deep drawing. Polymer-based thin film lubricants with pressure additives (e.g. Lubricants A and B) were more effective than other lubricants as shown by the force (e.g. maximum punch force and applicable BHF without cup fracture) and geometry indicators (e.g. draw-in length, flange perimeter and sidewall thinning).The pressure and temperature distributions at the die–sheet interface were predicted by FE simulation of deep drawing and ironing tests. As expected, the value of interface pressure and temperature were maximum at the die corner radius. |
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