Bipolar plate manufacturing device and method based on positive and negative pressure auxiliary forming

Abstract

The invention discloses a bipolar plate manufacturing device and method based on positive and negative pressure auxiliary forming. The device comprises an upper die and a lower die which are both connected with a machine tool, wherein a bipolar plate is fixed to the upper surface of the lower die through a bolt by means of a blank holder for stamping; the lower surface of the upper die and the upper surface of the lower die are provided with grooves corresponding to the stamped bipolar plate; the lower die internally comprises an air cavity used for storing air and keeping air pressure; the air cavity is connected with an external air source through an air inlet and outlet hole of the lower die; the upper portion of the wall of the air cavity is provided with an air hole; and the upper dieand the lower die achieve stamping of the bipolar plate under the control of the air pressure of the air cavity and the machine tool. According to the bipolar plate manufacturing device and method, the plate springback phenomenon in the bipolar plate machining process is reduced, the forming precision is high, the machining process is simple, popularization is easy, and automation is achieved. Meanwhile, the machining process is not limited by the size of the bipolar plate, and progress and popularization of fuel cells are promoted while the production period is shortened and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of thin plate forming, and in particular relates to a bipolar plate manufacturing device and method based on positive and negative pressure assisted forming. Background technique [0002] With the development of science and technology, the demand for new energy is becoming more and more urgent. As a promising new energy source, hydrogen fuel cells use hydrogen and oxygen to react to generate water, with low or even zero pollution, which meets the needs of green development. Hydrogen energy vehicle is an ideal application example of hydrogen fuel cell, and it is one of the directions of future automobile development. [0003] Bipolar plates are important components in hydrogen fuel cells, and the manufacture and development of bipolar plates affect the application of hydrogen fuel cells. In the application of hydrogen fuel cells in vehicles, due to the limited space of vehicles, hydrogen fuel cells are requ...

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Problems solved by technology

[0004] There are many difficulties in the forming and manufacturing of thin plates. For example, the ultimate strain in the plane strain region of the sheet is low, and it is easy to crack during processing; It is difficult to meet the requirements, so the forming quality of the bipolar plate is difficult to be accurately controlled

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