Application of load pulsation using servo press to plate forging of stainless steel parts |
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| Affiliation: | 1. IFMA – Federal Institute of Maranhao, São Luis, MA, Brazil;2. ISEL – Polytechnic Institute of Engineering, Department of Chemical Engineering, Lisbon, Portugal;3. IBB – IST, University of Lisbon – Av. Rovisco Pais, Lisbon, Portugal;4. UFU – Federal University of Uberlandia, Center for Research and Development of Welding Processes, Uberlandia, MG, Brazil;1. Department of Mechanical Engineering, Gifu University, Yanagido, Gifu, Japan;2. Valve & Tire Pressure Monitoring System Business Unit, Pacific Industrial Co. Ltd., Yoro, Gifu, Japan;3. School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan;1. Institute of Industrial Science, The University of Tokyo, Komaba 4-6-1, Meguro, Tokyo 153-8505, Japan;2. School of Material Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China |
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| Abstract: | Load pulsation using a servo press was applied to a forging process of a stainless steel sheet having high flow stress and adhesive bond. The effect of the load pulsation on the deformation behaviour of a stepped stainless steel part was examined. The cavity and rollover formed on the upper surface and on the bottom boss surface, respectively, are also decreased by the load pulsation. In the load pulsation, gaps for feeding a liquid lubricant are formed around edges and corner of the deforming plate by a difference in elastic recovery between the die and plate in each release of load, and thus these regions are automatically re-lubricated. The re-lubrication function was improved by immersing the plate in the lubricant during forging. The re-lubrication function for low-cost tool steel was higher than that high-cost tungsten carbide because of smaller Young's modulus. |
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| Keywords: | Plate forging Stainless steel Load pulsation Friction Re-lubrication Servo press |
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