Fabrication of Titanium Bipolar Plates by Rubber Forming Process and Evaluation Characteristics of TiN coated Titanium Bipolar Plates

Fuel Cells ◽  
2014 ◽  
Vol 15 (1) ◽  
pp. 170-177 ◽  
Author(s):  
K. H. Lee ◽  
C. K. Jin ◽  
C. G. Kang ◽  
H. Y. Seo ◽  
J. D. Kim
Keyword(s):  
Bipolar Plates ◽  
Forming Process ◽  
Rubber Forming

scholarly journals Numerical and experimental studies on wrinkling control methods of sheet metal part with high curvature and large flange in rubber forming

2019 ◽  
Vol 11 (10) ◽  
pp. 168781401988378
Author(s):  
Lei Chen ◽  
Ying Bai ◽  
Zhengyi Jiang ◽  
Huiqin Chen ◽  
Can Wu ◽  
...  
Keyword(s):  
Sheet Metal ◽  
Failure Modes ◽  
Optimal Parameter ◽  
Experimental Studies ◽  
Element Model ◽  
Resistance Force ◽  
Forming Process ◽  
Complex Deformation ◽  
Metal Forming Process ◽  
Rubber Forming

Wrinkling is one of the main failure modes in sheet metal forming process and may lead to assembly problems of the parts. Control of wrinkling is difficult due to the complex deformation behavior of the sheet metal. A finite element model for side blankholder method to control wrinkling was established and used for the simulation. Trials and simulations were conducted to analyze the parameters of wrinkling characteristics. Results show that with the increase in the angle of the side blankholder, the resistance force of the side blankholder decreases. The blank length on the side blankholder should be small enough. The fillet radius of the side blankholder should be large enough to reduce the deformation. The bottom gap between the die and the side blankholder cannot be too large because the support of the blank will decrease in the forming process. In order to verify the simulation results, three blank lengths (20, 15, and 5 mm) over the side blankholder were used in the experiment. The results of the comparison tests testify the reliability of the simulation. The optimal parameter of the blank length is 5 mm. A new clamp method was designed for wrinkling control to overcome the shortcomings of the side blankholder method. The precision of the part met the requirement using soft rubber and two layers of rubber plates.

The Cylindrical Structure of Metallic Bipolar Plates for Proton Exchange Membrane Fuel Cell

2011 ◽  
Vol 228-229 ◽  
pp. 1029-1034
Author(s):  
Jian Lan ◽  
Chen Ni ◽  
Lin Hua
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Bipolar Plate ◽  
Proton Exchange ◽  
Battery Life ◽  
Membrane Electrode ◽  
Bipolar Plates ◽  
Forming Process ◽  
Cylindrical Structure ◽  
Exchange Membrane

As a key component of proton exchange membrane fuel cell (PEMFC), the bipolar plate’s performance will directly affect the power output and battery life of the fuel cell. The conventional metallic bipolar plate is prone to warp, and has large flatness error with residual stress induced by forming process. This will result in contacting incompletely with membrane electrode assemblies (MEA) and lower fuel cell efficiency. A cylindrical structure of the PEMFC metallic polar plate is proposed to improve its stiffness and to reduce assembling error of the fuel cell. The polar plate features, which were originally designed on a flat surface, are projected onto the cylindrical surface with a certain curvature. Two cylindrical polar plates are welded together to become a bipolar plate. The finite element method is applied to compare the stiffness of the conventional and cylindrical polar & bipolar plates. The cylindrical bipolar plate has better stiffness and anti-warping than the conventional bipolar plate. The feasibility of the cylindrical structure is verified by experiment and provides a new idea for the improvement of the bipolar plate and fuel cell stack.

Research on One-Time Forming Process of Matrix PDC Bits

2010 ◽  
Vol 156-157 ◽  
pp. 190-193
Author(s):  
Zhong Liang Wei ◽  
Hang Wen ◽  
Qing He ◽  
Jin Mei Sun
Keyword(s):  
High Precision ◽  
Silicone Rubber ◽  
Production Efficiency ◽  
Graphite Powder ◽  
Technical Program ◽  
Forming Process ◽  
Increase Production Efficiency ◽  
Good Consistency ◽  
Rubber Forming ◽  
Powder Forming

Due to the difficulty in the ceramic mould forming process of matrix PDC bits and low production efficiency, a manufacturing mould technology of graphite powder forming process was developed. The technical program is to formulate a circuit of silicone rubber forming process, determine the forming process of first mould, rubber mould and graphite powder mould, and sinter bit. The results show that manufacturing bit mould to sinter PDC bits with this method can simplify the circuit, increase production efficiency, and improve bit quality. The resulting bit is also of high precision, exquisite appearance and good consistency

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