Alkaline electrolytic cell mastoid plate production process and device capable of guaranteeing flatness

Abstract

The invention discloses an alkaline electrolytic cell mastoid plate production process and device capable of guaranteeing flatness, and the process comprises the following steps: cutting a mastoid plate blanking blank according to the size of a finished mastoid plate, and enabling the diameter of the mastoid plate blanking blank to be greater than that of the finished mastoid plate; the mastoid plate blanking blank is placed at the position of a positioning pin column of a lower die plate of a stamping die to be positioned; the mastoid range on the mastoid plate blanking blank is stamped through mastoid punches on an upper die plate and a lower die plate of the stamping die, and mastoids are formed; lacing wire punches on an upper template and a lower template of the stamping die are used for stamping the mastoid plate blanking blank into lacing wires; after stamping is completed, the periphery of the mastoid plate blanking blank is cut according to the size of the finished mastoid plate, and the finished mastoid plate is obtained; according to the method, the planeness of the mastoid plate can be controlled, and the warping degree of the mastoid plate is controlled within 0.5 mm according to test detection qualification, so that the technical requirements can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of the production and manufacturing of papillary plates for alkaline electrolyzers, and particularly relates to a production process and device for papillary plates of alkaline electrolyzers that ensure flatness. Background Art

[0002] An alkaline electrolyzer (ALK) is a new energy equipment for hydrogen production by electrolyzing water. The papillary plate is a key functional structure of the main polar plate, which is a regular convex papillary structure array formed on the surface of a carbon steel substrate by a large-tonnage press stamping process. It forms an electrolyte flow channel with the pole frame through laser welding to become a bipolar plate assembly. The structure and warpage index of the papillary plate directly affect the current density distribution, bubble discharge efficiency and overall energy efficiency of the electrolyzer.

[0003] The papillary convex structure can increase the effective reaction area of the electrode, reduce the local current density, reduce the electrode polarization phenomenon, and improve the hydrogen evolution / oxygen evolution reaction efficiency (efficiency is increased by 3 - 6%). The papillary array forms a micron-level turbulence, accelerates the electrolyte circulation, promotes the detachment of hydrogen and oxygen bubbles from the electrode surface, and avoids the inactivation of active sites caused by the gas film coverage. The symmetrically distributed papillary structure can offset the extrusion stress during the assembly of the electrolyzer, reduce the deformation of the polar plate, and extend the service life (the service life is increased by more than 25%). The substrate of the papillary plate is cold-rolled low-carbon thin steel plate DC05 or DC04, with a very thin thickness of 1.6 mm or 1.5 mm. Usually, a stamping die and a press are used for normal-pressure forming, but often the warpage of the papillary plate is relatively large, exceeding 1 mm or even more than 2 mm after stamping, which causes trouble for subsequent laser assembly welding, increases stress and is not conducive to the overall structure and performance of the bipolar plate. Summary of the Invention

[0004] The purpose of the present invention is to provide a production process and device for papillary plates of alkaline electrolyzers that ensure flatness, which can achieve the control of the flatness of the papillary plate. After being tested and qualified, the warpage of the papillary plate is controlled within 0.5 mm, and the technical requirements can be met.

[0005] In order to achieve the above purpose, the present invention is realized through the following technical solutions:

[0006] In the first aspect, an embodiment of the present invention provides a production process for papillary plates of alkaline electrolyzers that ensure flatness, including the following steps:

[0007] According to the finished product size of the papillary plate, cut the blank of the papillary plate for blanking, so that the diameter of the blank of the papillary plate for blanking is larger than the diameter of the finished product of the papillary plate;

[0008] Place the blank of the papillary plate for blanking at the positioning pin column of the lower template of the stamping die for positioning;

[0009] The nipple punches on the upper template and the lower template of the stamping die stamp the nipple range on the blank of the nipple plate to form nipples; the rib punches on the upper template and the lower template of the stamping die stamp the blank of the nipple plate into ribs;

[0010] After stamping, the outer periphery of the blank of the nipple plate is cut according to the finished size of the nipple plate to obtain the finished nipple plate.

[0011] As a further technical solution, the diameter of the blank of the nipple plate is 15-20 mm larger than the diameter of the finished nipple plate.

[0012] As a further technical solution, the ribs are located within the range where the blank of the nipple plate is larger than the finished nipple plate and are evenly distributed in the circumferential direction.

[0013] As a further technical solution, the positioning pin columns are located at positions on the lower template of the stamping die that are tangent to the circumference of the blank of the nipple plate.

[0014] As a further technical solution, positioning holes corresponding to the positioning pin columns are provided on the upper template of the stamping die.

[0015] As a further technical solution, a plurality of positioning pin columns are provided, and the plurality of positioning pin columns are evenly arranged in the circumference.

[0016] As a further technical solution, during stamping, the set holding pressure is reached for the set holding time to complete stamping.

[0017] In a second aspect, an embodiment of the present invention provides a production device for a nipple plate of an alkaline electrolytic cell to ensure flatness, including a stamping die, the stamping die includes an upper template and a lower template, nipple punches are provided at positions on the upper template and the lower template corresponding to the nipple range of the nipple plate, rib punches are provided on the outer periphery of the nipple punches, positioning pin columns are provided on the lower template, and positioning holes corresponding to the positioning pin columns are provided on the upper template.

[0018] As a further technical solution, two circles of rib punches are provided.

[0019] As a further technical solution, each circle of rib punches is provided with a plurality of rib punches, and the plurality of rib punches are evenly distributed in the circumferential direction.

[0020] The beneficial effects of the above embodiments of the present invention are as follows:

[0021] The production process of the papillary plate for alkaline electrolytic cells that ensures flatness provided by the present invention calculates and designs the blank size for cutting the papillary plate and the stamping positioning scheme according to the finished product size of the papillary plate and the structure of the stamping die; the laser cutting blank is associated with the stamping positioning, making full use of the stamping die structure, increasing the versatility of the method, and avoiding the waste and cost of repeated design.

[0022] The production process of the papillary plate for alkaline electrolytic cells that ensures flatness provided by the present invention installs the papillary punch and the rib punch. According to the finished product size and the papillary range of the papillary plate, papillary punches that meet the papillary height are installed in the corresponding range of the upper and lower templates, and two circles of rib punches are arranged on the outer periphery of the papillary punches; the ribs stamped by the rib punches on the papillary plate blank improve the structural stability and force uniformity during the stamping forming of the papillary plate blank, thereby improving the flatness of the papillary plate and reducing warping.

[0023] The production process of the papillary plate for alkaline electrolytic cells that ensures flatness provided by the present invention is energy-saving and efficient. The first-pass qualification rate of the flatness of the papillary plate is increased by 80%, and the efficiency is increased by 100%; after PT detection, there are no defects such as stamping tensile cracks in the papillary plate. After dimensional inspection, the center distance, papillary height, and flatness of the papillary plate are all qualified, and the flatness is within 0.5 mm, reaching the advanced level in the industry.

[0024] The production device of the papillary plate for alkaline electrolytic cells that ensures flatness provided by the present invention is provided with positioning pin columns for positioning the blank for cutting the papillary plate on the lower template of the stamping die, which can play a positioning role during the stamping process. The positioning pin shafts for the blank for cutting the papillary plate prevent the blank for cutting the papillary plate from moving in the horizontal direction. The positioning pin shafts cooperate with the rib punches during the stamping process to form ribs on the blank for cutting the papillary plate to position the stamping process, so as to avoid the problem of unqualified flatness caused by the movement of the blank for cutting the papillary plate. Description of the Drawings

[0025] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0026] Figure 1 is the structure of the blank for cutting the papillary plate in the specific implementation mode of Embodiment 1 of the present invention;

[0027] Figure 2 is the front view of the papillary plate prepared in Embodiment 1 of the present invention;

[0028] Figure 3 is the side view of the papillary plate prepared in Embodiment 1 of the present invention.

[0029] The schematic diagrams are for illustrative purposes only. Detailed Description of the Invention

[0030] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0031] Example 1

[0032] In a typical embodiment of the present invention, a production process for an alkaline electrolytic cell mastoid plate with guaranteed flatness is provided, comprising the following steps:

[0033] According to the size of the finished product of the mastoid plate, the blank of the mastoid plate is cut so that the diameter of the blank of the mastoid plate is larger than the diameter of the finished product of the mastoid plate;

[0034] Place the blank of the mastoid plate on the positioning pin column of the lower template of the stamping die for positioning;

[0035] The mastoid punches on the upper and lower templates of the stamping die stamp the mastoid range on the blank of the mastoid plate to form the mastoid; the rib punches on the upper and lower templates of the stamping die stamp the blank of the mastoid plate to form ribs;

[0036] After the stamping is completed, the periphery of the blank of the mastoid plate is cut according to the finished size of the mastoid plate to obtain the finished mastoid plate.

[0037] In this embodiment, the diameter of the mastoid plate blank is 15-20 mm larger than the diameter of the mastoid plate finished product. When cutting the blank, the size of the mastoid plate blank is cut to be larger than the size of the mastoid plate finished product, providing an interval for the formation of punching reinforcement. The reinforcement punches on the upper and lower templates of the stamping die punch the mastoid plate blank into reinforcement. The punch reinforcement improves the structural stability and force uniformity of the mastoid plate blank during stamping, thereby improving the flatness of the mastoid plate and reducing warping. By setting the size within the range of 15-20 mm, the use of materials can be minimized while ensuring structural stability and force uniformity. The reinforcement is located within the range where the mastoid plate blank is larger than the mastoid plate finished product, and is evenly distributed in the circumferential direction.

[0038] In this embodiment, the positioning pin is located at a position on the lower template of the stamping die that is tangent to the circumference of the blank of the mastoid plate, and a positioning hole corresponding to the positioning pin is provided on the upper template of the stamping die. During the pressing process, the positioning pin on the lower template of the stamping die is inserted into the positioning hole on the upper template of the stamping die, and the positioning pin here positions the blank of the mastoid plate.

[0039] In this embodiment, according to the finished product size of the mastoid plate and the mastoid range, mastoid punches that match the mastoid height are installed within the corresponding range of the upper and lower templates. Two circles of rib punches are arranged on the outer periphery of the mastoid punches. During the stamping process, the mastoid punches form mastoids on the blank of the mastoid plate, and the rib punches form ribs on the blank of the mastoid plate, increasing the structural stability and uniform stress distribution of the thin plate.

[0040] In this embodiment, a plurality of positioning pin columns are provided on the lower template of the stamping die, and the plurality of positioning pin columns are evenly distributed in the circumferential direction. Preferably, four positioning pin columns are provided. Positioning pin columns are respectively arranged at the 45° and 315° positions of the outer circle of the corresponding mastoid plate blank size on the lower template of the stamping die. The positioning holes on the upper template and the positioning pin columns on the lower template are used as positioning positions, and the rib punches are used as positioning pin columns to make full use of the template structure and punch resources. Push the blank material to the positioning pin columns for positioning. Only with accurate positioning can the mastoid range and the number of mastoids that meet the technical requirements be stamped out.

[0041] In this embodiment, during the stamping process, the stamping is completed when the set holding pressure is reached for the set holding time.

[0042] The present invention first calculates and designs the blank size of the mastoid plate for blanking according to the forming size of the mastoid plate and the structure of the stamping die, and uses laser cutting for blanking. Positioning pin columns are respectively arranged at the 45° and 315° positions of the outer circle of the corresponding mastoid plate blank size on the lower template of the press. Mastoid punches are installed according to the number and range of mastoids. At the same time, two circles of rib punches are arranged on the outer periphery of the mastoid punches. Position the blanked blank plate on the lower template, set the stamping pressure and holding time on the press, press the start button to start stamping. After stamping is completed, take out the stamped mastoid plate, cut off the excess outer edge by laser cutting according to the finished product size of the mastoid plate, and detect the mastoid height, mastoid center distance, mastoid range and mastoid plate diameter, and perform PT penetration testing, all of which are qualified.

[0043] In a specific implementation manner of this embodiment, taking the mastoid plate with a diameter of as an example, as Figure 1 shown, the specific production process is as follows:

[0044] 1. Cut a plate with a thickness of 1.6 ± 0.10 mm, and the flat blanking size of the cut plate is φ1002 mm. The plate meets the standard of GB / T5213-2008 "Cold Rolled Low Carbon Steel Sheets and Strips".

[0045] 2. Install mastoid punches with a diameter of 4.5 mm within the mastoid range of the blank for the upper and lower templates of the stamping die, and arrange two circles of rib punches with a diameter of 4.5 mm on the outer periphery of the mastoid punches on the upper and lower templates of the stamping die.

[0046] 3. Set positioning pin columns on the outer circle of the blank of the corresponding papillary plate of the lower template of the stamping die, and set positioning pin columns on the outer periphery of the finished papillary plate, and push the blank of the papillary plate to the positioning pin columns for positioning;

[0047] 4. Use the stamping die to stamp the blank of the papillary plate, reach the set holding pressure time under the set holding pressure, and complete the stamping;

[0048] 5. Cut the outer diameter of the papillary plate to The structure of the obtained finished papillary plate is as Figure 2 and Figure 3 shown.

[0049] During the processing, pay attention to protecting the surface of the papillary plate from being scratched. It should be lifted and placed gently to avoid mutual friction and scratching between the papillary plates, and ensure that the papillary plate will not produce plastic deformation during the loading and unloading process.

[0050] After the papillary plate is stamped and formed, the height is 10.6 ± 0.3 mm, the height of the concave and convex points is 4.5 ± 0.10 mm; the flatness ≤ 1 mm; the scratch depth of the papillary plate after being pressed and formed ≤ 0.15 mm, and the length does not exceed 100 mm; the indentation depth at the bottom of the papillary plate ≤ 0.3 mm;

[0051] After forming, clean the surface of the papillary plate, and perform PT penetrant testing in accordance with NB / T 47013.5-2015 "Nondestructive Testing of Pressure Equipment - Part 5 Penetrant Testing". The qualified level is Grade I. The test result shows that the papillary plate has no surface cracks and through cracks. Use a height gauge to detect the warpage of the papillary plate, and the warpage will be controlled within 0.5 mm, meeting the standards and the technical requirements of the electrolytic cell, with 100% qualification.

[0052] Example 2

[0053] In a typical implementation manner of the present invention, a production device for the papillary plate of an alkaline electrolytic cell to ensure flatness is provided, including a stamping die. The stamping die includes an upper template and a lower template. Papillary punches are provided at positions corresponding to the papillary range of the papillary plate on the upper template and the lower template. A rib punch is provided on the outer periphery of the papillary punch, positioning pin columns are provided on the lower template, and positioning holes corresponding to the positioning pin columns are provided on the upper template.

[0054] In this embodiment, two circles of rib punches are provided.

[0055] In this embodiment, each circle of rib punches is provided with a plurality of them, and the plurality of rib punches are evenly distributed in the circumferential direction.

[0056] During the stamping process, the blank of the papilla plate is positioned by setting positioning pin columns and positioning holes on the mold. The papilla punch forms papillae on the blank of the papilla plate, and the rib punch forms ribs on the blank of the papilla plate. The cooperation between the ribs and the positioning pin columns increases the structural stability and uniform stress of the blank thin plate during the stamping process.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A production process for the papillary plate of an alkaline electrolytic cell to ensure flatness, characterized in that, The steps include: Cut the blank of the mastoid plate according to the finished size of the mastoid plate, so that the diameter of the blank of the mastoid plate is larger than that of the finished mastoid plate; Place the blank of the mastoid plate at the positioning pin column of the lower template of the stamping die for positioning; The mastoid punches on the upper template and the lower template of the stamping die punch the mastoid range on the blank of the mastoid plate to form mastoids; the rib punches on the upper template and the lower template of the stamping die punch the blank of the mastoid plate into ribs; After stamping, cut the outer periphery of the blank of the mastoid plate according to the finished size of the mastoid plate to obtain the finished mastoid plate.

2. The production process of the papillary plate of the alkaline electrolytic cell for ensuring flatness as described in claim 1, characterized in that, The diameter of the blank of the mastoid plate is 15-20 mm larger than that of the finished mastoid plate.

3. The production process of the papillary plate of the alkaline electrolytic cell for ensuring flatness as described in claim 1, characterized in that, The ribs are located within the range where the blank of the mastoid plate is larger than the finished mastoid plate and are evenly distributed in the circumferential direction.

4. The production process of the papillary plate of the alkaline electrolytic cell for ensuring flatness as described in claim 1, characterized in that, The positioning pin column is located at a position on the lower template of the stamping die that is tangent to the circumference of the blank of the mastoid plate.

5. The production process of the papillary plate of the alkaline electrolytic cell for ensuring flatness as described in claim 4, characterized in that, The upper template of the stamping die is provided with positioning holes corresponding to the positioning pin columns.

6. The production process of the papillary plate of the alkaline electrolytic cell for ensuring flatness as described in claim 4, characterized in that, A plurality of the positioning pin columns are provided, and the plurality of positioning pin columns are evenly arranged in the circumference.

7. The production process of the papillary plate of the alkaline electrolytic cell for ensuring flatness as described in claim 1, characterized in that, During stamping, the stamping is completed when the set holding pressure is reached for the set holding time.

8. An apparatus for producing the papillary plate of an alkaline electrolytic cell for ensuring flatness, which is used to implement the production process described in any one of claims 1-7, characterized in that, It includes a stamping die, the stamping die includes an upper template and a lower template, mastoid punches are arranged at positions on the upper template and the lower template corresponding to the mastoid range of the mastoid plate, rib punches are arranged on the outer periphery of the mastoid punches, positioning pin columns are arranged on the lower template, and positioning holes corresponding to the positioning pin columns are arranged on the upper template.

9. The apparatus for producing the papillary plate of the alkaline electrolytic cell for ensuring flatness according to claim 8, wherein, There are two circles of the rib punches.

10. The apparatus for producing the papillary plate of the alkaline electrolytic cell for ensuring flatness according to claim 9, wherein, Each circle of rib punches is provided with a plurality of them, and the plurality of rib punches are evenly distributed in the circumferential direction.

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