Using micro deep drawing with ironing stages to form stainless steel 304 micro cups |
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Authors: | Jenn-Terng Gau Sujith Teegala Kun-Min Huang Tun-Jen Hsiao Bor-Tsuen Lin |
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Institution: | 1. Department of Mechanical Engineering, Northern Illinois University, DeKalb, IL 60115, United States;2. Micro/Meso Mechanical Manufacturing R&D Department, Metal Industries Research & Development Centre (MIRDC), Kaohsiung, Taiwan;3. Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115, United States;4. Department of Mechanical and Automation Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung, Taiwan |
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Abstract: | The needs of stainless steel 304 micro cups have been increasing tremendously due to the trend of miniaturization in medical and electronic devices, etc. For application purpose, it is highly desired to have stainless steel micro cups with high CH/OD (cup height/outer diameter) ratios. Due to the constraints of the limit draw ratio (LDR) of stainless steel 304 sheets in micro deep drawing, forming a micro cup with high CH/OD ratio at room temperature cannot be achieved by using a single stage deep drawing die. A process consisting of one micro deep drawing and two ironing stages was proposed for achieving this goal; three micro dies were designed, fabricated and used for experimental validation. A series of experiments were conducted by using the stainless steel 304 sheets of 200 μm thickness annealed at four different temperatures to understand the influence of size effects on this process for generating knowledge, know-how and technologies to form high quality stainless steel micro cups with large CH/OD ratio. No lubricant was used in this study. It was proven that the proposed process is a robust process as long as the sheets are annealed at the temperature no less than 900 °C for more than 3 min. |
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