For deep cylindrical cups with a large height-diameter ratio, it is difficult to be hydroformed in one stroke. Reverse deep drawing is necessary after deep drawing. Deformation optimization was performed to achieve a large drawing ratio and uniform thickness. An inconel718 superalloy deep cup was investigated numerically and experimentally. For a larger total drawing ratio 3.1, different deformations were analyzed for hydromechanical deep drawing and reverse hydromechanical deep drawing under the condition of different loading paths. Effects of deformations were discussed on the thickness. Typical defects were analyzed for different deformation. Optimal deformation was determined for hydromechanical deep drawing and reverse hydromechanical deep drawing. The results show that a superalloy cup with a total drawing ratio 3.1 could be successfully hydroformed, and the minimum thickness is 0.65 mm.

References

References
1.
Nakamura
,
K.
, 1987, “
Sheet Metal Forming With Hydraulic Counter Pressure in Japan
,”
CIRP Ann.
,
36
(
1
), pp.
191
194
.
2.
Hartl
,
C.
, 2005, “
Research and Advances in Fundamentals and Industrial Applications of Hydroforming
,”
J. Mater. Process. Technol.
,
167
, pp.
383
392
.
3.
Zhang
,
S.-h.
,
Wang
,
Z. -r
,
Xu
,
Yi.
, 2004, “
Recent Developments in Sheet Hydroforming Technology
,”
J. Mater. Process. Technol.
,
151
, pp.
237
2414
.
4.
Lang
,
L.
,
Danckert
,
J.
, and
Nielsen
,
K. B.
, 2004, “
Study on Hydromechanical Deep Drawing With Uniform Pressure onto the Blank
,”
J. Mater. Process. Technol.
,
44
, pp.
495
502
.
5.
Nakamura
,
K.
,
Nakagawa
,
T.
, and
Amino
,
H.
, 1997, “
Various Application of Hydraulic Counter Pressure Deep Drawing
,”
J. Mater. Process. Technol.
,
71
(
1
), pp.
160
167
.
6.
Thiruvarudchelvan
,
S.
, and
Tan
,
M. J.
, 2007, “
Fluid-Pressure-Assisted Deep Drawing
,”
J. Mater. Process. Technol.
,
192–193
, pp.
8
12
.
7.
Yongchao
,
X.
,
Yu
,
C.
, and
Shijian
,
Y.
, 2008, “
Loading Path Optimization of Hydro-Mechanical Deep Drawing of the Cup With a Semi-Ball Bottom
,”
J. Harbin Inst. Technol.
,
40
(
7
), pp.
1076
1080
. (Chinese journal)
8.
Yongchao
,
X.
, and
Dachang
,
K.
, 2003, “
Hydromechanical Deep Drawing of Alumite LF6
,”
Chin. J. Nonferrous Met.
,
13
(
1
), pp.
60
64
.
9.
Lihui
,
L.
,
Tao
,
L.
, and
Xianbin
,
Z.
, 2006, “
Optimized Constitutive Equation of Material Property Based on Inverse Modeling for Aluminum Alloy Hydroforming Simulation
,”
Trans. Nonferrous Met. Soc. China.
,
161
, pp.
379
1385
.
10.
Amino
.
H.
,
Makita
.
K.
, and
Maki
.
T.
, 2000, “
Sheet Fluid Forming and Sheet Dieless NC Forming
,”
International Conference on New Developments in Sheet Metal Forming
, Fellbach/Stuttgart-Germany, pp.
39
66
.
11.
Yongchao
,
X.
,
Xin
,
L.
,
Xiaojing
,
L.
, and
Shi-jian
,
Y.
, 2009, “
Deformation and Defects in Hydroforming of 5A06 Aluminum Alloy Dome With Controllable Radial Pressure
,”
J. Cent. South. Univ. Technol.
,
16
, pp.
887
891
.
12.
Xu
,
Y.
, and
Kang
,
D.
, 2004, “
Investigation of SUS304 Stainless Steel With Warm Hydro-mechanical Deep Drawing
,”
J. Mater. Sci. Technol.
,
20
(
1
), pp.
92
93
.
13.
Yongchao
,
X.
,
Cong
,
H.
,
Xin
,
L.
,
Shijian
,
Y.
, and
Dachang
,
K.
, 2010, “
Effects of Radial Pressure on 5A06 Aluminium Alloy Cup Hydroforming
,”
Steel Res. Int.
,
81
(
9
), pp.
632
635
.
You do not currently have access to this content.