Transactions of Materials and Heat Treatment

Title：Scale effect of micro drawing forming with SUS 304 ultra thin sheet

Authors： Wu Bin Hu Changchun Shan Yun

Unit： College of Mechanical Engineering Wuxi Institution of Supervision & Testing on Product Quality

KeyWords： micro forming scale effect grain size ultra thin sheet normalization

ClassificationCode：TG142.41

year,vol(issue):pagenumber：2017,42(3):31-34

Abstract：

Three sets of typical square cup dies for micro drawing named as Ⅰ,Ⅱ and Ⅲ were designed and developed. These materials with thickness of 100, 50 and 20 μm were conducted by heat treatment at room temperature, 850 ℃ and 950 ℃ respectively. Then, they were drawn in three dies, and the maximum drawing force and the maximum drawing depth were studied respectively. It is found that the scale effect is obvious during micro drawing process, and the maximum drawing force and the maximum drawing depth are decreasing sharply and cannot be explained and calculated by the similarity and analogy principle in macro forming. Therefore, the size ratio λ and thicknessgrain size ratio of t/D by normalized treatment are introduced, which demonstrates the relatively large size micro drawing phenomena produced by Ⅰ,Ⅱ dies and only by introducing the thickness grain size ratio of t/D can explain the mutation phenomenon produced by Ⅲ die.

Funds：

国家自然科学基金资助项目（51165021）

吴斌（1972-），男，硕士，副教授单云(1971-)，女，硕士，教授

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