Generation and Suppression of Dimples in Multi-Square-Punch Forming Process for Doubly Curved Ship Hull Plate Forming

2015 ◽  
Author(s):  
Y Cai ◽  
◽  
Y Hul ◽  
C Wang ◽  
P Yuan ◽  
...  
Keyword(s):  
Ship Hull ◽  
Forming Process ◽  
Doubly Curved ◽  
Ship Hull Plate

Doubly Curved Ship Hull Plate Forming by Reconfigurable Die With Square Press Head

2011 ◽  
Author(s):  
Y Hu ◽  
◽  
C Wang ◽  
P Yuan ◽  
C Huang ◽  
...  
Keyword(s):  
Ship Hull ◽  
Doubly Curved ◽  
Reconfigurable Die ◽  
Ship Hull Plate

Effects of inductor patterns on temperature and deformation behavior of ship hull plate by induction heating

2018 ◽  
Vol 232 (23) ◽  
pp. 4371-4389
Author(s):  
Shuiming Zhang ◽  
Cungen Liu ◽  
Xuefeng Wang ◽  
Zhi Yang
Keyword(s):  
Induction Heating ◽  
Opposite Direction ◽  
Thermal Deformation ◽  
Transient Analysis ◽  
Ship Hull ◽  
Temperature Dependent ◽  
Thermal Forming ◽  
Ship Hull Plate ◽  
Heating Direction ◽  
Transverse Shrinkage

This paper mainly investigated the effects of different inductor patterns on thermal forming behavior of ship hull plate by moving induction heating. Alternately-coupled electromagnetic-thermal analysis procedure considering temperature-dependent material properties was firstly implemented at each moving step of inductor, followed with uncoupled thermal-mechanical transient analysis to obtain corresponding thermal deformation. Then temperature distribution, dimensions (breadth b and depth h) of heat-affected zone, and deformation obtained from codirectional current-carrying inductor with no gap and opposite-direction current-carrying inductor with gap were compared, respectively. And effects of heating directions and distance T2 of ODIG were also analyzed. It turns out that codirectional current-carrying inductor with no gap can generate much larger transverse shrinkage at 1.8–2.5 mm/s than opposite-direction current-carrying inductor with gap, otherwise smaller at 3.2–4.0 mm/s, likewise larger temperature gradient at 1.8–4.0 mm/s and thus larger bending angular deformation. Besides, heating direction “Out” can generate larger deformation than “In” and deformation for opposite-direction current-carrying inductor with gap can be effectively improved through adjusting distance T2 until 13 mm. These indicate that adopting appropriate inductor patterns, heating direction and distance T2 of opposite-direction current-carrying inductor with gap can significantly improve thermal forming behavior.

Numerical Simulation on Doubly Curved Ship Hull Thick Plate Forming with Multi-Press Head

2013 ◽  
Author(s):  
Hu Yong ◽  
◽  
Xiang Yong ◽  
Zheng Beijia ◽  
Zhang Yi ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Thick Plate ◽  
Ship Hull ◽  
Doubly Curved

Numerical and experimental analysis on cold-forming and spring-back of hull plate

2018 ◽  
Vol 233 (3) ◽  
pp. 561-569 ◽  
Author(s):  
Wei Shen ◽  
Renjun Yan ◽  
Shuangying Li
Keyword(s):  
Three Dimensional ◽  
Dimensional Accuracy ◽  
Ship Hull ◽  
Laser Forming ◽  
Successive Approximation Method ◽  
Spring Back ◽  
Forming Process ◽  
Cold Forming ◽  
Thick Plates ◽  
Forming Mechanism

Ship hull structures are fabricated by curved thick plates before they are welded together. There are traditional methods such as, line heating and laser-forming methods for plate bending. However, it is recognized that the hot-forming technology causes a series of troubles on doubly or multiple curved plates. Multi-point forming mechanism with square press heads is a new forming process for three-dimensional ship hull plate. Cold-forming has a high dimensional accuracy but results in spring-back. The spring-back process of curved thick plates in the finite element method is analyzed and the predicted results are compared with the test results in the present paper. To ensure the forming precision, the successive approximation method is also developed and verified to control the spring-back.

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