A grid continuous casting and punching process

Abstract

The application relates to the technical field of battery grid manufacturing, and discloses a grid continuous casting and continuous punching process, characterized in that the process comprises the following steps: ingredients are prepared according to the composition of the grid, tin, aluminum, calcium, antimony and lead are respectively preheated at 200 DEG C for 0.5-1.5 h; and the preheated lead is heated and melted by using a crucible resistance furnace. Compared with the grid directly formed by casting, the grid is first cast into a casting blank, then the casting blank is calendered into a thin plate, and finally the grid is formed through a punching process and the like, alloy elements such as antimony and calcium are added, and the casting and rolling process is adopted, so that the rolling passes are increased after the rough rolling process is added, the reasonable rolling process of the thick blank rolled through multiple passes is formed, the thickness ratio of the raw material to the finished product is increased, the total compression ratio in the rolling process is increased, the internal metal structure of the finished product is improved, the grains are refined, the crystalline structure is dense, the mechanical properties of the product are improved, the grid is resistant to penetration corrosion, and the cycle life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery grid manufacturing, in particular to a grid continuous casting and continuous punching process. BACKGROUND

[0002] The grid is a main component of lead-acid battery, which is the current collecting framework of the electrode, plays a role in conducting and collecting current and making the current distribution uniform, and supports the active material, which is the carrier of the active material. The positive active material PbO2 in the lead-acid battery has poor conductivity and high resistivity, while the resistivity of the alloy grid is low, and the conductive capacity is more than 10,000 times that of PbO2. The resistivity of PbSO4 in the negative electrode is even larger, so coating the active material on the grid can greatly reduce the internal resistance of the battery. The existing grid is not resistant to through corrosion and has a short cycle life, so there is an urgent need for a grid continuous casting and continuous punching process to solve the above problems. SUMMARY

[0003] (I) Technical problems solved

[0004] In view of the deficiencies of the prior art, the present application provides a grid continuous casting and continuous punching process, which has the advantages of making the structure of the thin plate more dense, high mechanical strength, and the produced grid is resistant to through corrosion and has a long cycle life, etc., solving the problems of the existing grid not being resistant to through corrosion and having a short cycle life.

[0005] (II) Technical solutions

[0006] In order to achieve the above-mentioned purpose of making the structure of the thin plate more dense and high mechanical strength, and thus the produced grid is resistant to through corrosion and has a long cycle life, etc., the present application provides the following technical solutions: a grid continuous casting and continuous punching process, characterized in that the process comprises the following steps:

[0007] 1) According to the composition of the grid, the ingredients are prepared, and tin, aluminum, calcium, antimony and lead are preheated at 200 DEG C for 0.5-1.5h respectively;

[0008] 2) The preheated lead is melted by a crucible resistance furnace, when the temperature reaches 400 DEG C, tin is added to the solution, and fully stirred for 1-2.5min, then when the temperature reaches 700 DEG C, antimony and aluminum are added to the solution in turn, and fully stirred for 3-4.5min, finally when the temperature reaches 1100 DEG C, calcium is added to the solution, and fully stirred for 1-3min, to obtain an alloy liquid, and argon is used for gas protection during the smelting process;

[0009] 3) when the alloy liquid reaches 1200℃ in step 2, the powder refining agent is blown into the alloy liquid with argon, at the same time, argon is introduced for refining treatment and slagging; then the alloy liquid is placed at 850-950℃ for 20-40min, after grain refinement treatment, the alloy liquid is degassed, filtered and slagged to obtain the lead alloy liquid with uniform composition, the temperature of the lead alloy liquid is 760-800℃;

[0010] 4) the lead alloy liquid obtained in step 3 is horizontally cast into a mold cavity to obtain a cast blank after cooling; the mold cavity is arc-shaped, and the periphery of the mold cavity is uniformly provided with a plurality of nozzles for spraying cooling water, wherein the horizontal casting temperature is 700-740℃, the temperature of the cooling water is not higher than 35℃, and the cooling water pressure is 0.01-0.04MPa;

[0011] 5) the cast blank obtained in step 4 is straightened and then subjected to rough rolling and finish rolling processes; when rough rolling is performed, the entry rolling temperature is controlled to be 280-350℃; the hot continuous casting blank entry rolling thickness is 35-45mm, the final rolling thickness is 15-20mm, and the rolling reduction ratio of each pass is less than 50%;

[0012] 6) when finish rolling is performed, the cast blank after rough rolling in step 5 is preheated to 250-290℃, and then three passes of hot continuous rolling are performed; the hot continuous casting blank entry rolling thickness is 15-20mm, the final rolling thickness is 6-9mm, the rolling reduction ratio of each pass is less than 50%, and then the rolling temperature is cooled to the coiling temperature, and the coiling temperature is 200℃ to obtain a coiled material;

[0013] 7) the coiled material obtained in step 6 is straightened, and then the sheet is subjected to primary processing, and then the primary processed sheet is sent to a work platform, a die is arranged above the work platform, and a punch is arranged on the top of the die;

[0014] 8) the punch start switch is turned on to drive the punch to stamp the sheet in the die for deep processing, the cooled sheet is coated with lead paste and dried to form a sheet.

[0015] Preferably, the composition of the grid comprises the following raw materials in the following weight ratio: tin 10-16 parts, aluminum 5-2 parts, calcium 7-10 parts, antimony 8-2 parts, and lead 80-93 parts.

[0016] Preferably, the grain refinement treatment in step 3 uses aluminum titanium boron as a refiner.

[0017] Preferably, the standing in step 3 uses a standing furnace, the degassing uses an online degassing device, and the filtration uses a ceramic filtration device.

[0018] Preferably, the total reduction rate reached by rough rolling and finish rolling in steps 5 and 6 is not less than 50%, and the cast slab and the coiled material are straightened by using a five-roller straightener respectively in steps 5 and 7.

[0019] Preferably, a phosphorus removal process is added before the rough rolling process and the finish rolling process.

[0020] Preferably, the phosphorus removal process adopts a high-pressure water phosphorus removal process.

[0021] (Three) beneficial effects

[0022] Compared with the prior art, the present application provides a grid continuous casting and continuous punching process, which has the following beneficial effects:

[0023] 1. The grid continuous casting and continuous punching process, by setting the addition of antimony, calcium and other alloy elements and the use of the casting and rolling process, compared with the directly cast formed grid, the casting and rolling forming process first casts a cast slab, then calenders the cast slab to form a thin plate, and then finally forms a grid through a punching process, so that the thin plate has a more dense structure and high mechanical strength, and therefore the produced grid has high penetration corrosion resistance and long cycle life.

[0024] 2. The grid continuous casting and continuous punching process, by increasing the rough rolling process, the number of rolling passes is correspondingly increased, a reasonable rolling process of thick blank through multi-pass rolling is formed, the thickness ratio of the raw material to the finished product is increased, the total compression ratio in the rolling process is increased, which is beneficial to improve the internal metal structure of the finished product, refine the grain, make the crystal structure dense, thereby improve the mechanical properties of the product, and the grain refiner made of aluminum, titanium and boron is added to further improve the effect; and a phosphorus removal process is added before the rough rolling process and the finish rolling process, after two times of phosphorus removal, the finish rolling process is entered, which can significantly improve the surface quality of the thin plate. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] Embodiment one: the present embodiment provides a grid continuous casting and continuous punching process, characterized in that the process comprises the following steps:

[0027] 1) according to the composition of the grid, the raw materials are proportioned, the composition of the grid includes the following raw materials in parts by weight: tin 12 parts, aluminum 3 parts, calcium 8 parts, antimony 6 parts, lead 88 parts, tin, aluminum, calcium, antimony and lead are respectively preheated at 200 DEG C for 1h;

[0028] 2) using a crucible resistance furnace to heat the preheated lead to melt, when the temperature reaches 400℃, tin is added to the solution, and fully stirred for 2 minutes, then when the temperature reaches 700℃, antimony and aluminum are added to the solution in turn, and fully stirred for 4 minutes, finally when the temperature reaches 1100℃, calcium is added to the solution, and fully stirred for 2 minutes, to obtain an alloy liquid, and argon is used for gas protection during smelting;

[0029] 3) when the alloy liquid in step 2 reaches 1200℃, the powder refiner is blown into the alloy liquid with argon, at the same time, argon is introduced for refining treatment and slagging; then it is placed at 900℃ for 30 minutes after grain refinement treatment, the grain refinement treatment uses aluminum titanium boron as a refiner, degassing, filtration and slag removal are carried out to obtain a lead alloy liquid with uniform composition, the placement uses a static furnace, the degassing uses an online degassing device, the filtration uses a ceramic filter device, the temperature of the lead alloy liquid is 780℃, the rolling passes are increased after adding a rough rolling process, a reasonable rolling process of thick blank rolled by multiple passes is formed, the thickness ratio of raw material to finished product is increased, the total compression ratio in the rolling process is increased, which is beneficial to improve the internal metal structure of the finished product, refine the grain, make the crystal structure dense, thereby improve the mechanical properties of the product, and the aluminum titanium boron grain refiner further improves the effect; and a phosphorus removal process is added before the rough rolling process and the finish rolling process, after two times of phosphorus removal, the finished rolling process is entered, which can significantly improve the surface quality of the sheet;

[0030] 4) the lead alloy liquid obtained in step 3 is horizontally cast into a mold cavity to obtain a casting blank after cooling; the mold cavity is arc-shaped, and the periphery of the mold cavity is uniformly provided with a plurality of nozzles for spraying cooling water, wherein the horizontal casting temperature is 720℃, the cooling water temperature is not higher than 35℃, and the cooling water pressure is 0.02MPa;

[0031] 5) the casting blank obtained in step 4 is straightened and then subjected to rough rolling and finish rolling processes; when rough rolling, the entry temperature is controlled to be 300℃; the hot continuous casting blank entry thickness is 40mm, the finish rolling thickness is 17mm, and the rolling reduction ratio of each pass is less than 50%;

[0032] 6) when finish rolling, the cast blank after rough rolling in step 5 is preheated to 270℃, then three hot continuous rolling, rough rolling and finish rolling are carried out, the total reduction rate is not less than 50%, the entry thickness of the hot continuous rolling cast blank is 17mm, the final rolling thickness is 8mm, the rolling reduction of each pass is less than 50%, then cooled to the coiling temperature, the coiling temperature is 200℃ to obtain the coiled material, a phosphorus removal process is added before the rough rolling process and the finish rolling process, the phosphorus removal process adopts high-pressure water phosphorus removal process, by setting the addition of antimony, calcium and other alloy elements and the adoption of casting rolling process, compared with the directly cast formed grid, the cast rolling forming process first casts a cast blank, then calendering the cast blank into a thin plate, then forming the grid through stamping process, so that the thin plate has more dense structure and high mechanical strength, therefore the produced grid has penetration corrosion resistance and prolonged cycle life;

[0033] 7) straightening the coiled material obtained in step 6, then carrying out primary processing on the thin plate, then sending the primary processed thin plate into the work platform, a die is arranged above the work platform, and a punch is installed on the top of the die, the straightening in steps 5 and 7 adopts a five-roll straightening machine to straighten the cast blank and the coiled material respectively;

[0034] 8) starting the punch starting switch to drive the punch to stamp the thin plate in the die for deep processing, coating the cooled thin plate with lead paste and drying to form.

[0035] Embodiment two: the embodiment provides a grid continuous casting and stamping process, characterized in that the process comprises the following steps:

[0036] 1) according to the composition of the grid, the ingredients are prepared, the composition of the grid includes the following raw materials in parts by weight: tin 10 parts, aluminum 5 parts, calcium 7 parts, antimony 8 parts, lead 80 parts, the tin, aluminum, calcium, antimony and lead are respectively preheated at 200℃ for 0.5h;

[0037] 2) the preheated lead is heated and melted by a crucible resistance furnace, when the temperature reaches 400℃, tin is added to the solution, and stirred thoroughly for 1min, then when the temperature reaches 700℃, antimony and aluminum are added to the solution in turn, and stirred thoroughly for 3min, finally when the temperature reaches 1100℃, calcium is added to the solution, and stirred thoroughly for 1min to obtain the alloy liquid, argon is used for gas protection during the smelting process;

[0038] 3) when the alloy liquid reaches 1200℃ in step 2, the powder refining agent is blown into the alloy liquid with argon, at the same time, argon is introduced for refining treatment and slagging; then, after standing for 20 min at 850℃, grain refinement treatment is carried out, the grain refinement treatment uses aluminum titanium boron as a refiner, degassing, filtration and slag removal are carried out, and a lead alloy liquid with uniform composition is obtained, the standing is carried out in a standing furnace, the degassing is carried out by using an online degassing device, the filtration is carried out by using a ceramic filtration device, the temperature of the lead alloy liquid is 760℃, after increasing the rough rolling process, the rolling passes are correspondingly increased, a reasonable rolling process of the thick blank formed by multi-pass rolling is formed, the thickness ratio of the raw material to the finished product is increased, the total compression ratio in the rolling process is increased, which is beneficial to improve the internal metal structure of the finished product, refine the grain, make the crystalline structure dense, and thus improve the mechanical properties of the product, and the grain refiner made of aluminum titanium boron further improves the effect; and a phosphorus removal process is added before the rough rolling process and the finish rolling process, after two times of phosphorus removal, the finished rolling process is entered, which can significantly improve the surface quality of the sheet;

[0039] 4) the lead alloy liquid obtained in step 3 is horizontally cast into a mold cavity, and a casting blank is obtained after cooling; the mold cavity is arc-shaped, and the periphery of the mold cavity is uniformly provided with a plurality of nozzles for spraying cooling water, wherein the temperature of the horizontal casting is 700℃, the temperature of the cooling water is not higher than 35℃, and the cooling water pressure is 0.01MPa;

[0040] 5) after the casting blank obtained in step 4 is straightened, rough rolling and finish rolling processes are carried out; when rough rolling is carried out, the rolling-in temperature is controlled to be 280℃; the hot continuous casting blank rolling-in thickness is 35mm, the final rolling thickness is 15mm, and the rolling reduction ratio of each pass is less than 50%;

[0041] 6) when finish rolling is carried out, the casting blank after rough rolling in step 5 is preheated to 250℃, and then three times of hot continuous rolling is carried out, the total reduction rate of rough rolling and finish rolling is not less than 50%, the hot continuous casting blank rolling-in thickness is 15mm, the final rolling thickness is 6mm, and the rolling reduction ratio of each pass is less than 50%, and then the temperature is cooled to the coiling temperature, the coiling temperature is 200℃ to obtain a coiled material, a phosphorus removal process is added before the rough rolling process and the finish rolling process, the phosphorus removal processes all adopt high-pressure water phosphorus removal process, by setting the addition of antimony, calcium and other alloy elements and the adoption of casting rolling process, compared with the directly cast formed grid, the casting rolling forming process first casts a casting blank, then the casting blank is calendered to form a sheet, and then the sheet is finally formed into a grid through stamping process, so that the structure of the sheet is more dense and the mechanical strength is high, therefore the produced grid is resistant to penetration corrosion and has prolonged cycle life;

[0042] 7) The coiled material obtained in step 6 is straightened, and then the sheet is subjected to primary processing, and then the primary processed sheet is sent to a work platform, a die is arranged above the work platform, and a punch is arranged on the top of the die, and the straightening in steps 5 and 7 is performed by using a five-roller straightening machine to straighten the cast blank and the coiled material, respectively;

[0043] 8) The punch starting switch is turned on, the punch drives the sheet in the die to be punched and deeply processed, the cooled sheet is coated with lead paste and dried to form.

[0044] Example Three: The present embodiment provides a grid continuous casting and continuous punching process, characterized in that the process comprises the following steps:

[0045] 1) The ingredients of the grid are prepared according to the composition of the grid, which includes the following raw materials in parts by weight: tin 16 parts, aluminum 2 parts, calcium 10 parts, antimony 2 parts, lead 93 parts, and the tin, aluminum, calcium, antimony and lead are preheated at 200℃ for 1.5h respectively;

[0046] 2) The preheated lead is melted by using a crucible resistance furnace, when the temperature reaches 400℃, tin is added to the solution, and fully stirred for 2.5min, then when the temperature reaches 700℃, antimony and aluminum are added to the solution in turn, and fully stirred for 4.5min, finally when the temperature reaches 1100℃, calcium is added to the solution, and fully stirred for 3min, to obtain an alloy liquid, argon is used for gas protection during the smelting process;

[0047] 3) When the alloy liquid in step 2 reaches 1200℃, the powder refiner is blown into the alloy liquid by argon, at the same time, argon is introduced for refining treatment and slagging; then it is placed at 950℃ for 40min after grain refinement treatment, the grain refinement treatment uses aluminum titanium boron as a refiner, degassing, filtering and deslagging are performed to obtain a lead alloy liquid with uniform composition, the static setting uses a static setting furnace, the degassing uses an online degassing device, the filtering uses a ceramic filtering device, the temperature of the lead alloy liquid is 800℃, and after increasing the rough rolling process, the corresponding rolling passes are increased, a reasonable rolling process of the thick blank through multi-pass rolling is formed, the thickness ratio of the raw material to the finished product is increased, the total compression ratio in the rolling process is increased, which is beneficial to improve the internal metal structure of the finished product, refine the grain, make the crystal structure dense, and thus improve the mechanical properties of the product, and the aluminum titanium boron made grain refiner further improves the effect; and a phosphorus removal process is added before the rough rolling process and the finish rolling process, after two times of phosphorus removal, the sheet enters the finish rolling process, which can significantly improve the surface quality of the sheet;

[0048] 4) horizontally cast the lead alloy liquid obtained in step 3 into a mold cavity, and obtain a casting blank after cooling; the mold cavity is arranged in an arc shape, and the periphery of the mold cavity is uniformly provided with a plurality of nozzles for spraying cooling water, wherein the temperature of the horizontal casting is 740 DEG C, the temperature of the cooling water is not higher than 35 DEG C, and the cooling water pressure is 0.04 MPa;

[0049] 5) after the casting blank obtained in step 4 is straightened, rough rolling and finish rolling processes are carried out in sequence; when rough rolling is carried out, the entry temperature is controlled to be 350 DEG C; the entry thickness of the hot continuous casting blank is 45 mm, the final rolling thickness is 20 mm, and the rolling reduction ratio of each pass is less than 50%;

[0050] 6) when finish rolling is carried out, the casting blank after rough rolling in step 5 is preheated to 290 DEG C in advance, and then three passes of hot continuous rolling are carried out, the total rolling reduction rate of rough rolling and finish rolling is not less than 50%, the entry thickness of the hot continuous casting blank is 20 mm, the final rolling thickness is 9 mm, the rolling reduction ratio of each pass is less than 50%, and then the temperature is cooled to the coiling temperature, the coiling temperature is 200 DEG C to obtain a coiled material, a phosphorus removal process is added before the rough rolling process and the finish rolling process, the phosphorus removal process adopts a high-pressure water phosphorus removal process, by adding antimony, calcium and other alloy elements and adopting the casting and rolling process, compared with the directly cast formed grid, the casting and rolling forming process first casts a casting blank, then calenders the casting blank into a thin plate, and then finally forms a grid through stamping and other processes, so that the organization of the thin plate is more dense and the mechanical strength is high, so that the produced grid is resistant to penetration corrosion and has a prolonged cycle life;

[0051] 7) straighten the coiled material obtained in step 6, then process the thin plate, then send the processed thin plate into a work platform, a die is arranged above the work platform, and a punch is installed on the top of the die, and the straightening in steps 5 and 7 uses a five-roller straightening machine to straighten the casting blank and the coiled material respectively;

[0052] 8) turn on the punch switch to drive the punch to stamp the thin plate in the die, apply lead paste to the cooled thin plate and dry form the thin plate.

[0053] The present application has the beneficial effects that: the grid continuous casting and continuous punching process, by setting adding antimony, calcium and other alloy elements and the adoption of the casting and rolling process, compared with the directly cast formed grid, the casting and rolling forming process firstly casts the casting blank, then calendering the casting blank to form the thin plate, and then finally forms the grid through the stamping process, so that the organization of the thin plate is more dense, the mechanical strength is high, so that the produced grid is resistant to penetration corrosion, the cycle life is prolonged; by increasing the rough rolling process, the rolling passes are correspondingly increased, the reasonable rolling process of the thick blank formed by multi-pass rolling is formed, the thickness ratio of the raw material and the finished product is increased, the total compression ratio in the rolling process is increased, which is beneficial to improve the internal metal structure of the finished product, refine the grain, make the crystalline organization dense, thereby improve the mechanical properties of the product, and the grain refiner made of aluminum titanium boron is added, which further improves the effect; and a phosphorus removal process is added before the rough rolling process and before the finish rolling process, after two times of phosphorus removal, the finish rolling process is entered, which can significantly improve the surface quality of the thin plate.

[0054] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, the scope of the present application being defined by the appended claims and their equivalents.

Claims

1. A continuous casting and stamping process for gratings, characterized in that, The process includes the following steps: 1) Prepare the ingredients according to the composition of the grid, and preheat tin, aluminum, calcium, antimony and lead at 200℃ for 0.5-1.5h respectively; 2) The preheated lead is melted in a crucible resistance furnace. When the temperature reaches 400℃, tin is added to the solution and stirred thoroughly for 1-2.5 minutes. Then, when the temperature reaches 700℃, antimony and aluminum are added to the solution in sequence and stirred thoroughly for 3-4.5 minutes. Finally, when the temperature reaches 1100℃, calcium is added to the solution and stirred thoroughly for 1-3 minutes to obtain an alloy liquid. Argon gas is used for gas protection during the melting process. 3) When the alloy liquid reaches 1200℃ in step 2, the powdered refining agent is blown into the alloy liquid with argon gas. At the same time, argon gas is introduced for refining and slag removal. Then, it is allowed to stand at 850-950℃ for 20-40 minutes. After grain refinement, it is degassed, filtered and slag removed to obtain a lead alloy liquid with uniform composition. The temperature of the lead alloy liquid is 760-800℃. 4) The lead alloy liquid obtained in step 3 is horizontally poured into the mold cavity and cooled to obtain a casting billet; the mold cavity is arc-shaped and the four sides of the mold cavity are evenly covered with several nozzles for spraying cooling water. The horizontal pouring temperature is 700-740℃, the temperature of the cooling water is not higher than 35℃, and the cooling water pressure is 0.01-0.04MPa. 5) After straightening the billet obtained in step 4, perform rough rolling and finish rolling processes. During rough rolling, control the entry temperature to 280-350℃. The entry thickness of the billet is 35-45mm, the final thickness is 15-20mm, and the rolling amount per pass is less than 50%. 6) During the finishing rolling, the billet after rough rolling in step 5 is preheated to 250-290℃, and then subjected to three hot continuous rolling passes. The thickness of the billet entering the hot continuous rolling process is 15-20mm, the thickness of the final rolling process is 6-9mm, the rolling weight ratio of each pass is less than 50%, and then cooled to the coiling temperature of 200℃ to obtain the coil. 7) Straighten the roll material obtained in step 6, then perform preliminary processing on the thin sheet, and then send the pre-processed thin sheet into the working platform. A mold is set above the working platform, and a punch is installed on the top of the mold. 8) Turn on the punch press start switch to drive the punch press to perform deep punching on the thin plate in the mold, apply lead paste to the cooled thin plate and dry it to form the shape.

2. The continuous casting and stamping process for plate grids according to claim 1, characterized in that, The grid is composed of the following raw materials in parts by weight: 10-16 parts tin, 2-5 parts aluminum, 7-10 parts calcium, 2-8 parts antimony, and 80-93 parts lead.

3. The continuous casting and stamping process for plate grids according to claim 1, characterized in that, In step 3, the grain refinement process uses aluminum-titanium-boron as a grain refiner.

4. The continuous casting and stamping process for plate grids according to claim 1, characterized in that, In step 3, a settling furnace is used for settling, an online degassing device is used for degassing, and a ceramic filtration device is used for filtration.

5. The continuous casting and stamping process for plate grids according to claim 1, characterized in that, The total reduction rate achieved in the roughing and finishing rolling in steps 5 and 6 shall not be less than 50%, and the straightening in steps 5 and 7 shall be performed by a five-roll straightener on the billet and the coil, respectively.

6. The continuous casting and stamping process for plate grids according to claim 1, characterized in that, A descaling process is added before both the rough rolling and finish rolling processes.

7. The continuous casting and stamping process for plate grids according to claim 6, characterized in that, All phosphorus removal processes employ high-pressure water phosphorus removal technology.