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Expanded graphite plate lossless cutting device and using method thereof

A technology of expanding graphite and cutting, which is applied in the field of non-destructive cutting devices for expanded graphite plates. It can solve the problems of increased density, broken expanded graphite plates, and easy compression, etc., so as to improve the service life, increase the yield, and reduce the impact. Effect

Pending Publication Date: 2022-05-17
SHANGHAI SHENLI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, due to the poor structural strength of expanded graphite itself, it is easy to be compressed. The existing knife die stripping is rebounded after being compressed by high-elastic foam, and the material is ejected to realize stripping; when it is squeezed by high-elastic foam, it will cause the area The density of the expanded graphite material increases by 50%-150%, and even directly leads to local fracture of the expanded graphite plate, which affects the molding

Method used

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  • Expanded graphite plate lossless cutting device and using method thereof
  • Expanded graphite plate lossless cutting device and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A non-destructive cutting device for expanded graphite plates, comprising a cover plate, a knife mold and a discharge plate, the side of the knife mold facing the cover plate is provided with a cutting portion enclosed by a knife edge, and the discharge plate is sleeved on the enclosure Inside.

[0046] The enclosure includes an inner enclosure and an outer enclosure, and the inner enclosure is located within the outer enclosure;

[0047] The projection of the discharge plate on the upper surface of the die is located between the inner enclosure and the outer enclosure.

[0048] Positioning pins are provided on the upper surface of the die cutter, and positioning holes are provided on the cover plate opposite to the positioning pins.

[0049] A limiting block is arranged on the upper surface of the mold, and the limiting block is located on the edge of the cutting mold and does not overlap with the position of the positioning pin.

[0050] The die is also provided with ...

Embodiment 2

[0061] A non-destructive cutting device for expanded graphite plates, the same as embodiment one will not be repeated; wherein

[0062] The blade has a thickness of 0.4mm and a height of 4mm; the blade is a double-edged knife;

[0063] Described cutting die is engraving die, and the thickness of described cutting die is 30mm;

[0064] The height of the limiting block is 6mm;

[0065] The minimum distance between the maximum radius tangent of the discharge hole and the cutting edge is greater than 2mm.

[0066] The flatness of the ejector plate is 1mm, and the parallelism is 1mm;

[0067] The height of the discharge ejector pin is 40 mm, and the maximum diameter is 1 mm smaller than the diameter of the discharge hole.

[0068] The thickness of the cover plate is 40mm, the flatness is 1mm, the parallelism is 1mm, and the material is aluminum alloy, stainless steel.

[0069] The thickness of the discharge plate is 1mm, the flatness is 1mm, the parallelism is 1mm, and the mate...

Embodiment 3

[0071] A method for using the expanded graphite plate non-destructive cutting device described in Embodiment 1 or Embodiment 2, comprising

[0072] Feeding, assembling the cover plate, cutting die and discharge plate into a cutting structure, the cutting die and cover plate are positioned and installed through positioning pins and positioning holes, and the discharge plate is installed between the inner enclosure and the outer enclosure , and fix the cutting part, place the expanded graphite plate between the cutting part and the cover plate; the minimum frame of the expanded graphite plate should be more than 2mm larger than the maximum edge of the outer encirclement, pass the cover plate through the positioning hole along the positioning pin of the die The self-weight is flatly pressed on the top of the expanded graphite plate to achieve material fixation.

[0073] Stamping and cutting, extruding the cover plate with a pressure of 2.5 tons, and stamping and cutting the expan...

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Abstract

The invention relates to the technical field of fuel cells, in particular to an expanded graphite plate lossless cutting device and a using method thereof.The device comprises a cover plate, a cutting die and a discharging plate, a cutting part defined by cutting edges is arranged on the face, facing the cover plate, of the cutting die, and the discharging plate is arranged in the enclosure in a sleeved mode; through the arrangement of the cover plate, the cutting die and the discharging plate, during use, an expanded graphite plate can be placed between the cutting part and the cover plate, and cutting is achieved through stamping; the influence of cutting on the characteristics of the expanded graphite plate material is reduced, and the yield of the fuel cell bipolar plate is improved; waste is discharged while discharging is conducted through the ejector plate, and efficiency is improved; all parts on the expanded graphite plate lossless cutting device can be replaced independently, and the service life of equipment is prolonged.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a non-destructive cutting device for expanded graphite plates and a method for using the same. Background technique [0002] As a key component of the PEMFC stack, the bipolar plate accounts for about 70% to 80% of the total mass of the entire PEMFC stack, and accounts for about 40% to 60% of the total cost. Heavy weight and high manufacturing cost are the main bottlenecks in the commercialization of proton exchange membrane fuel cell stacks. Therefore, it is necessary to select a suitable bipolar plate material and a reasonable bipolar plate preparation process to reduce the overall quality and cost of the proton exchange membrane fuel cell stack. [0003] At present, there are three types of dual-machine plates commonly used in proton exchange membrane fuel cell stacks: metal plates, pure graphite and composite plates. Metal bipolar plates not only have high strength and g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D28/02B21D28/14B21D45/00H01M8/0213
CPCB21D28/02B21D28/14B21D45/006H01M8/0213
Inventor 李昂俞强甘全全戴威
Owner SHANGHAI SHENLI TECH CO LTD
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