Investigation into Influence of Pre-Forming Depth on Multi-Stage Hydrodynamic Deep Drawing of Thin-Wall Cups with Stepped Geometries

2012 ◽  
Vol 457-458 ◽  
pp. 1219-1222
Author(s):  
Yu Zhu ◽  
Min Wan ◽  
Ying Ke Zhou ◽  
Qing Hai Liu ◽  
Nan Song Zheng ◽  
...  
Keyword(s):  
Deep Drawing ◽  
Thin Wall ◽  
Hydrodynamic Deep Drawing ◽  
Multi Stage

Investigation into Influence of Pre-Forming Depth on Multi-Stage Hydrodynamic Deep Drawing of Thin-Wall Cups with Stepped Geometries

2012 ◽  
Vol 457-458 ◽  
pp. 1219-1222 ◽  
Author(s):  
Yu Zhu ◽  
Min Wan ◽  
Ying Ke Zhou ◽  
Qing Hai Liu ◽  
Nan Song Zheng ◽  
...  
Keyword(s):  
Deep Drawing ◽  
Failure Modes ◽  
Thickness Distribution ◽  
Steel Part ◽  
Drawing Ratio ◽  
Thin Wall ◽  
Forming Process ◽  
Hydrodynamic Deep Drawing ◽  
Multi Stage ◽  
Thin Walled

Hydrodynamic deep drawing (HDD) is an effective method for manufacturing complicated and thin-walled parts. Aiming at the forming process of the stainless steel part with 0.4 mm thick and complex stepped geometries, the technology scheme of multi-stage HDD assisted by conventional deep drawing (CDD) is proposed in consideration of wrinkling and destabilization in the unsupported region of the conical wall, and finite element models are built. As a key process parameter, pre-forming depth on the quality of the parts is explored with assistance of numerical simulations and verification experiments. Furthermore, the failure modes, including wrinkling and fracture during forming process are discussed; meanwhile, the optimum pre-forming depth is realized. The results indicate that the technological method is proven to be feasible for integral forming of thin-walled parts with a large drawing ratio and stepped geometries; moreover, the parts with uniform thickness distribution and high quality are successfully formed by adopting optimum pre-forming depth.

Investigation into hydrodynamic deep drawing assisted by radial pressure

2004 ◽  
Vol 148 (1) ◽  
pp. 119-131 ◽  
Author(s):  
Lihui Lang ◽  
Joachim Danckert ◽  
Karl Brian Nielsen
Keyword(s):  
Deep Drawing ◽  
Radial Pressure ◽  
Hydrodynamic Deep Drawing

Formability of Pure Titanium Long-Cup by Multi-Stage Deep Drawing

2010 ◽  
Vol 654-656 ◽  
pp. 1307-1310 ◽  
Author(s):  
Yasunori Harada ◽  
Toshiyuki Araki ◽  
Takahiro Tsuda
Keyword(s):  
Oxide Layer ◽  
Deep Drawing ◽  
Direct Contact ◽  
Pure Titanium ◽  
Oxide Coating ◽  
Titanium Sheet ◽  
Multi Stage

The pure titanium long-cups were formed by preventing the seizing in cold multi-stage deep drawing processes. For the prevention, pure titanium sheets were treated by heating oxide coating. The coating is very effective in preventing the occurrence of seizure and galling. The fresh and clean titanium is not in direct contact with the die during the forming due to the existence of the oxide layer. In multi-stage deep drawing, pure titanium sheets of the JIS grade 2 was employed. Various cups were drawn by exchanging the punch and ringed die. The die was flat in the first stage, and was taped without a blankholder in the subsequent stages. The effects of the coating conditions on the occurrence of seizure in multi-stage deep drawing were examined. It was found that the coating titanium sheet has sufficient ability in preventing the seizure in multi-stage deep drawing processes. The pure titanium long-cups were successfully formed by a multi-stage deep drawing operation in cold.

Effects of forming media on hydrodynamic deep drawing

2016 ◽  
Vol 30 (5) ◽  
pp. 2237-2242 ◽  
Author(s):  
Vahid Modanloo ◽  
Abdolhamid Gorji ◽  
Mohammad Bakhshi-Jooybari
Keyword(s):  
Deep Drawing ◽  
Hydrodynamic Deep Drawing

A Study on Initial Blank Design to Minimize Earing in Multi-Stage Deep Drawing Process for Rectangular Cup Using High Strength Steel Material

2013 ◽  
Vol 652-654 ◽  
pp. 1971-1975
Author(s):  
Pan Liu ◽  
Tae Wan Ku ◽  
Beom Soo Kang
Keyword(s):  
Deep Drawing ◽  
Sheet Material ◽  
Simulation Models ◽  
Drawing Process ◽  
Element Analysis ◽  
Normal Anisotropy ◽  
Deep Drawing Process ◽  
Initial Blank ◽  
Multi Stage ◽  
Blank Shape

Multi-stage deep drawing process for rectangular cups with extreme aspect ratio using finite element analysis is performed. The process is mainly consists of four forming stages including blanking, drawing, ironing and trimming. However, main deformation of the rectangular cup is completed during the drawing-ironing procedure. Tool design and blank modification for the multi-stage deep drawing process are presented. To consider the deep drawing and the ironing operations, the multi-stage deep drawing process is applied to obtain the rectangular cup by using each numerical simulation models from first to fifth drawing. Based on the design results of the initial blank, the multi-stage deep drawing process is performed, but it is shown that severe earing phenomenon is occurred at the upper flange part. To solve the severe deformation at the upper flange due to normal anisotropy of the used sheet material, initial blank modification is carried out. The simulation results for the rectangular cup are compared with the final configuration before and after the modification of the blank shape. The predicted result is confirmed that the modified blank shape not only improve the quality of a deep-drawn product but also reduce the cost of production.

Formability of Magnesium-Lithium Alloy Sheet by Multi-Stage Deep Drawing

2012 ◽  
Vol 706-709 ◽  
pp. 1164-1169 ◽  
Author(s):  
Yasunori Harada ◽  
Atsushi Yamamoto ◽  
Takayuki Goto ◽  
Eiji Nakamura
Keyword(s):  
Magnesium Alloy ◽  
Deep Drawing ◽  
Alloy Sheet ◽  
Ambient Temperatures ◽  
Deep Drawability ◽  
Lithium Alloy ◽  
Flat Sheet ◽  
Sheet Blank ◽  
Multi Stage ◽  
Blank Diameter

The formability of the magnesium-lithium alloy was examined by multi-stage deep drawing. Long cups of magnesium alloy were formed at ambient temperatures by multi-stage deep drawing processes. In multi-stage deep drawing, the magnesium-lithium alloy sheets were employed and a flat sheet blank is formed into a cylindrical by a punch. Various cups were drawn by exchanging the punch and ringed die. The die was flat in the first stage, and was taper without a blankholder in the subsequent stages. The effects of the ratio of blank diameter to punch diameter and blank thickness on the deep drawability were examined. It was confirmed that the Mg-Li alloy long-cups were successfully formed by a multi-stage deep drawing operation in cold.

Optimum Design of Forming Sequence of One-Piece Automobile Steel Wheels without Welding Using Finite Element Simulation

2007 ◽  
Vol 340-341 ◽  
pp. 773-778
Author(s):  
Y. Abe ◽  
J. Watanabe ◽  
Kenichiro Mori
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Optimum Design ◽  
Deep Drawing ◽  
Outer Side ◽  
Forming Process ◽  
Multi Stage ◽  
Element Simulation ◽  
Automobile Steel ◽  
The One

A forming sequence of one-piece automobile steel wheels without welding was designed. In this forming process, the one-piece wheel was formed from a circular blank only by multi-stage stamping operations, and a deeply drawn cup was formed into the wheel. Two humps of the rim flange for fixing the tire were formed in the flaring and flanging stages. The humps of the rim in the opening and outer side were formed by buckling the inner flange of the rim, and by swelling the outer flange with an upper die having a short land, respectively. In addition, the number of stages was considerably reduced from 16 stages to only 9 stages by combining the deep drawing and ironing stages and by adding a holding die in the flaring stages. The forming sequence of the one-piece wheels was evaluated by both finite element simulation and miniature experiment.

A study on hydrodynamic deep drawing equipment

2000 ◽  
Vol 101 (1-3) ◽  
pp. 21-24 ◽  
Author(s):  
Kang Dachang ◽  
Lang Lihui ◽  
Meng Xiaofeng ◽  
Xuan Jingquan
Keyword(s):  
Deep Drawing ◽  
Hydrodynamic Deep Drawing

Formability of Beta Titanium Alloy in Multi-Stage Deep Drawing Process

2007 ◽  
Vol 345-346 ◽  
pp. 121-124
Author(s):  
Yasunori Harada ◽  
Kenzo Fukaura ◽  
Kenichiro Mori
Keyword(s):  
Titanium Alloy ◽  
Deep Drawing ◽  
Oxide Coating ◽  
High Reactivity ◽  
Alloy Sheet ◽  
Drawing Process ◽  
Beta Titanium Alloy ◽  
Deep Drawing Process ◽  
Beta Titanium ◽  
Multi Stage

In the multi-stage deep drawing processes of a beta titanium alloy sheet, the formability has been investigated. The beta titanium alloy sheets have sufficient ductility at room temperature, whereas a seizure tends to occur during deep drawing due to high reactivity with other materials. To prevent the seizure, the beta titanium alloy sheet was treated by oxide coating heating, because the coated sheet was not in direct contact with the die during deep drawing due to the existence of the oxide layer. The blank used was the commercial beta titanium alloy Ti-15V-3Cr-3Sn-3Al. The effect of the coating condition on the formability in the multi-stage deep drawing process was examined. It was found that long drawn cups with a height sixfold that of the diameter were successfully formed by oxide coating heating.

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