Alternate deep drawing process for spherical parts in near equal-thickness wall
- PDF / 1,860,026 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 32 Downloads / 147 Views
ORIGINAL ARTICLE
Alternate deep drawing process for spherical parts in near equal-thickness wall Chunxiang Zhang 1 & Wenliang Huang 1,2 & Chenyang Xi 1,2 & Peng Xue 3 & Baorui Tian 2 & Junting Luo 1,2 Received: 23 June 2020 / Accepted: 22 September 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract Double-directional alternate deformation can improve the uniformity of strain hardening in deformation regions. Based on this principle, a new alternate deep drawing process for spherical parts was presented and experiment was carried out. Results show that the limit number of repeated deep drawing for spherical parts is 3, and spherical parts’ height cannot exceed 3/4 of the punch radius after each drawing. Compared with once deep drawing, the thickness strain in the ball bottom zone of parts formed by alternate deep drawing is significantly reduced. The thinning rates of forming parts in the thinnest point for 1-step deep drawing, 2-step alternate drawing, and 3-step alternate deep drawing are 0.127, 0.092, and 0.009, respectively. Alternate deep drawing can improve the mechanical properties of materials, such as hardness and Young’s modulus, and improve the global formability of the sheet metal. After 3-step alternate deep drawing, the sheet metal can be formed with near equal-thickness wall. During alternate deep deformation, a lot of twins impede dislocation motion, thereby improving the local work hardening ability in local areas and extending the deformation to low strain areas, and thus, the materials exhibit very high elongation and the global formability of the sheet metal is improved. Keywords Spherical part . Alternate deep drawing . Near equal-thickness wall forming . Global formability . Twins
1 Introduction Sheet metal stamping forming plays an important role in industrial fields, such as automotive, aviation, aerospace, and electronics. At present, the size accuracy, surface quality, shape complexity, and forming limit of stamping products become more and more important. So research on special stamping of sheet metal has become one of the main development directions in stamping field. So far, sheet metal soft mold forming process and flexible forming technique have been studied more and more, such as hydro-forming [1–3], viscous pressure forming [4, 5], solid
* Junting Luo [email protected] 1
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
2
Education Ministry Key Laboratory of Advanced Forging & Stamping Technology and Science, Yanshan University, Qinhuangdao 066004, China
3
FSM QHD Co., Ltd, Qinhuangdao 066004, China
granules medium, powder medium forming technology [6, 7], and multi-point forming [8, 9]. However, these processes have some disadvantages due to the use of various special media and equipment, such as hydro-forming and viscous medium pressure forming, although they can properly improve the forming limit, but they greatly limit the increase of heating temperature [10, 11]; although solid
Data Loading...
