A forming process for the bulletproof layer of titanium alloy bulletproof vest

Abstract

The present invention discloses a process for forming the bulletproof layer of a titanium alloy bulletproof vest. The process is a process for forming the titanium alloy layer of the bulletproof vest in a vacuum environment. In a vacuum environment, there is no oxygen, and the product will not be oxidized after high-temperature forming. There is no need to treat the surface contamination layer by sandblasting, and serious deformation will not occur. In addition, heating the surface of the product in a vacuum environment will only produce an extremely thin contamination layer, which can be removed by corrosion. The product will not absorb hydrogen if it is not milled, thereby avoiding the risk of hydrogen embrittlement. The principle of the present invention is to first fix the titanium alloy plate on the designed tooling, and then place the whole into a vacuum furnace and raise it to a certain temperature. The titanium alloy plate softens at high temperature and is formed by pressing the tooling.

Description

Technical Field

[0001] The present invention relates to a bulletproof vest material technology, in particular to a preparation technology of a bulletproof layer of a bulletproof vest, and in particular to a molding process of a bulletproof layer of a titanium alloy bulletproof vest. Background Art

[0002] Bulletproof vests are used to protect against bullets and shrapnel. Composite body armor has become widely used. To reduce weight and increase strength, composite body armor uses titanium alloys with low density, light weight, and high specific strength as the intermediate layer. Titanium alloys also offer excellent corrosion resistance, exhibiting excellent corrosion resistance in air, seawater, and oxidizing media, as well as corrosion resistance in alkaline solutions and most organic acids. However, due to its high chemical activity, titanium reacts with oxygen, nitrogen, hydrogen, CO, and CO₂ at high temperatures. It is particularly susceptible to oxidation and hydrogen absorption, making it susceptible to contamination and the risk of hydrogen embrittlement. Body armor is typically made from 0.8 mm thick titanium plates. Conventional hot-forming and forging processes produce a large surface contamination layer, which can only be removed by sandblasting or chemical milling. However, due to the thin thickness, sandblasting can cause significant deformation, and the large surface area of ​​the product makes sandblasting inefficient. In addition, when removing the contamination layer by chemical milling, because the plate is too thin, it is particularly easy to absorb hydrogen during chemical milling, which may cause the product to be at risk of hydrogen embrittlement. Summary of the Invention

[0003] In view of this, an object of the present invention is to provide a forming process for the bulletproof layer of a titanium alloy bulletproof vest.

[0004] To achieve the above object, the present invention provides a forming process for a bulletproof layer of a titanium alloy bulletproof vest, comprising the following steps:

[0005] Step 1): The titanium alloy plate is subjected to defect detection, and the surface is cleaned using circulating water after the defect detection;

[0006] Step 2): After cleaning, the titanium alloy plate is placed in a corrosion tank to perform corrosion operations on the surface of the titanium alloy plate;

[0007] Step 3): Use circulating water to clean during the corrosion operation and dry after cleaning;

[0008] Step 4): After drying, the titanium alloy plate is placed in a baking oven and baked at a constant temperature of 100 to 200° C. for 20 to 30 minutes. After baking, the titanium alloy plate is taken out and kept at a temperature not lower than 100° C., and a layer of glass lubricant is sprayed on the upper and lower surfaces of the titanium alloy plate to form a protective layer;

[0009] Step 5): After spraying, the titanium alloy plate is placed in a tooling, and then the tooling is placed in a vacuum furnace for heat treatment and pressed using the tooling. The heating treatment includes: maintaining the vacuum degree of the vacuum furnace ≤ 6.5x10-2Pa, first heating the vacuum furnace temperature to 750-850℃ and then holding it for 20-30min, then continuing to heat it to 900-940℃ and then holding it for 30-60min, and cooling it after holding it until it cools to below 200℃ and exits the vacuum furnace;

[0010] Step 6): Using a laser cutting machine to cut the heat-treated titanium alloy plate into finished product specifications;

[0011] Step 7): After cutting, perform defect detection again;

[0012] Step 8): After the test is completed, place the titanium alloy plate in a clean water tank and use warm water at 20-40°C to clean the protective layer on the surface of the titanium alloy plate;

[0013] Step 9): After the protective layer is cleaned, the surface of the titanium alloy plate is placed in a corrosion tank for secondary corrosion. During the secondary corrosion process, recycled water is used for secondary cleaning. After cleaning, the plate is dried. After drying, the finished product is inspected and packaged for storage after passing the inspection.

[0014] Preferably, in step 1), the titanium alloy plate is a TC4 grade titanium alloy plate.

[0015] Preferably, in step 2), a corrosive liquid is provided in the corrosion tank, and the corrosive liquid is a mixture of hydrofluoric acid, nitric acid and water, wherein the concentration of nitric acid is: 288-356 g / l; the concentration of hydrofluoric acid is: 15.5-29 g / l. During the corrosion operation, the temperature of the corrosive liquid is maintained at 15-35°C, the titanium alloy plate is placed in the corrosion tank and completely immersed in the corrosive liquid, and the titanium alloy plate is shaken back and forth in the corrosive liquid using a tool, and the thickness of the eroded titanium alloy plate does not exceed 0.02 mm.

[0016] Preferably, in step 3), the titanium alloy plate is removed from the corrosion tank, placed in a cold cleaning tank and cleaned 1 to 3 times with circulating water, and compressed air is introduced into the cold cleaning tank and stirred during the cleaning process, and then transferred to a hot cleaning tank for hot cleaning using hot water at a temperature of 60 to 80°C, and compressed air is introduced into the hot cleaning tank and stirred during the cleaning process.

[0017] Preferably, the glass lubricant is aluminum oxide;

[0018] The thickness of the protective layer is 0.06-0.08 mm.

[0019] Preferably, the tooling includes a base, a pressure plate and a pressure block assembly. The titanium alloy plate is placed on the base, and then the pressure plate is placed on the base. The pressure block assembly is arranged on the side end surface of the base for positioning and fixing the position between the base and the pressure plate.

[0020] Preferably, the titanium alloy plate is placed between the base and the pressing plate, and the titanium alloy plate is heated at high temperature in a vacuum environment and simultaneously pressed and formed by the base and the pressing plate.

[0021] Preferably, in step 9), the secondary etching operation is performed as follows:

[0022] Place the titanium alloy plate in the corrosion tank and completely immerse it in the corrosion liquid. Use a tool to shake the titanium alloy plate back and forth in the corrosion liquid, and make sure that the thickness of the titanium alloy plate eroded does not exceed 0.01mm.

[0023] The etching solution is a mixture of hydrofluoric acid, nitric acid and water, wherein the concentration of the mixture of nitric acid and water is 300-330 g / l; the concentration of the mixture of hydrofluoric acid and water is 20-25 g / l. During the etching operation, the temperature of the etching solution is maintained at 15-35°C.

[0024] Preferably, in step 9), the secondary cleaning operation is as follows:

[0025] The titanium alloy plate is taken out from the corrosion tank, and then placed in a cleaning tank and cleaned with warm water at a temperature of 20 to 40° C. for 1 to 2 minutes.

[0026] This invention relates to a process for forming the titanium alloy layer of bulletproof vests in a vacuum environment. Oxygen is absent in this vacuum environment, and the product will not oxidize after high-temperature forming. Sandblasting is not required to remove surface contamination, thus preventing severe deformation. Furthermore, heating the product in a vacuum environment leaves only a small amount of surface contamination, which can be removed simply by etching. Therefore, chemical milling is not required, and without chemical milling, the product will not absorb hydrogen, thus avoiding the risk of hydrogen embrittlement.

[0027] The present invention can not only ensure that the product is well formed so that the titanium alloy middle layer and outer layer of the bulletproof vest are well fitted; it also ensures that basically no contamination layer is generated during the entire process, and does not require chemical milling to avoid the risk of hydrogen embrittlement; the entire process has fewer steps, which greatly improves the processing difficulty and production efficiency.

[0028] In the above, the purpose of the protective layer is to protect the surface of the product from being contaminated at high temperatures. At the same time, the products are taken out after heat treatment, and the protective layer between them makes it easy to separate them when they are taken out. Otherwise, many products will be pressed together and cannot be separated. If they are forced to be separated, the products will be deformed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the tooling of the present invention;

[0030] Figure 2 This is a front view schematic diagram of the bulletproof layer of the titanium alloy bulletproof vest of the present invention;

[0031] Figure 3 This is a schematic diagram of the reverse side of the bulletproof layer of the titanium alloy bulletproof vest of the present invention. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] This invention is a process for forming the titanium alloy layer of bulletproof vests in a vacuum environment. In a vacuum environment without oxygen, the product will not oxidize after high-temperature forming, eliminating the need for sandblasting to remove surface contamination, thus preventing severe deformation. Furthermore, heating the product surface in a vacuum environment only produces a very thin contamination layer, which can be removed simply by etching. Without chemical milling, the product will not absorb hydrogen, thus avoiding the risk of hydrogen embrittlement.

[0034] It should be noted that the principle of the present invention is to first fix the titanium alloy plate on the designed tooling, and then put the whole into a vacuum furnace and raise it to a certain temperature. The titanium alloy plate softens at high temperature and is pressed into shape by the tooling.

[0035] Reference Figures 1 to 3 The tooling includes a base 2, a pressure plate 1, and a pressure block assembly 3. The titanium alloy plate is placed on the base, and then the pressure plate is placed on the base. The pressure block assembly 3 is arranged on the side end surface of the base and is used to position and fix the position between the base and the pressure plate. The titanium alloy plate is placed between the base and the pressure plate. The titanium alloy plate is heated at high temperature in a vacuum environment and is simultaneously pressed and formed by the base and the pressure plate. The pressure block assembly includes a fixed end arranged on the side of the base and a fixing rod arranged at the fixed end.

[0036] Example 1

[0037] The present invention provides a forming process for a bulletproof layer of a titanium alloy bulletproof vest, comprising the following steps:

[0038] Step 1): Select a TC4 grade titanium alloy plate, perform defect detection on the titanium alloy plate, and then use circulating water to clean the surface after defect detection;

[0039] Step 2): After cleaning, the titanium alloy plate is placed in a corrosion tank to perform a corrosion operation on the surface of the titanium alloy plate; the corrosion tank is provided with a corrosion liquid, which is a mixture of hydrofluoric acid, nitric acid and water, wherein the concentration of nitric acid is: 288g / l; the concentration of hydrofluoric acid is: 15.5g / l. During the corrosion operation, the temperature of the corrosion liquid is maintained at 15°C, the titanium alloy plate is placed in the corrosion tank and completely immersed in the corrosion liquid, and the titanium alloy plate is shaken back and forth in the corrosion liquid using a tool, so that the thickness of the titanium alloy plate eroded does not exceed 0.02mm; wherein the purpose of the corrosion operation is to remove contaminants on the surface of the titanium alloy plate.

[0040] Step 3): During the corrosion operation, the titanium alloy plate is washed with circulating water and dried after washing. During the washing process, the titanium alloy plate is first placed in a cold washing tank and washed once with clean water at a temperature of 20°C. During the washing process, compressed air is introduced into the cold washing tank and stirred. Then, the plate is transferred to a hot washing tank and hot water at a temperature of 60°C is used for hot washing. During the washing process, compressed air is introduced into the hot washing tank and stirred.

[0041] Step 4): After drying, the titanium alloy plate is placed in a baking furnace and baked at a constant temperature of 100°C for 20 minutes. After baking, it is taken out and kept at an environment with a temperature not lower than 100°C, and a layer of glass lubricant is sprayed to form a protective layer; the glass lubricant is aluminum oxide; the thickness of the protective layer is 0.06mm; the purpose of the protective layer is to protect the surface of the product from being contaminated at high temperatures. At the same time, the product is taken out after heat treatment, and it is easy to separate from each other due to the protective layer when it is taken out. Otherwise, the products will be pressed together and cannot be separated. If they are forced to be separated, the product will be deformed;

[0042] Step 5): After spraying, place the titanium alloy plate in the tooling, and then place the tooling in a vacuum furnace for heat treatment. The heating treatment includes: maintaining the vacuum degree of the vacuum furnace ≤6.5x10 -2 Pa, first heat the vacuum furnace temperature to 750°C and then keep it warm for 20 minutes, then continue to heat it to 900°C and keep it warm for 30 minutes, cool it after the insulation is completed, and cool it to below 200°C before taking it out of the vacuum furnace; the tooling includes a base, a pressing plate and a pressing block assembly, the titanium alloy plate is placed on the base, and then the pressing plate is placed on the base, the pressing block assembly is arranged on the side end surface of the base, and is used for positioning and fixing the position between the base and the pressing plate; the titanium alloy plate is placed between the base and the pressing plate, and the titanium alloy plate is subjected to high-temperature heating in a vacuum environment (first the vacuum furnace temperature is heated to 750°C and then kept warm for 20 minutes, and then continued to heat it to 900°C and kept warm for 30 minutes, during which the titanium alloy plate is in a softening process), and at the same time, the titanium alloy plate is subjected to high-temperature pressing and forming by the base and the pressing plate;

[0043] Step 6): Using a laser cutting machine to cut the heat-treated titanium alloy plate according to product specifications;

[0044] Step 7): After cutting, perform defect detection again;

[0045] Step 8): After the test is completed, place the titanium alloy plate in a clean water tank and use 20°C warm water to clean the protective layer on the surface of the titanium alloy plate. This step ensures that the protective layer is completely cleaned. If there is any residue, it will contaminate the etching solution during the next process.

[0046] Step 9): After cleaning, the surface of the titanium alloy plate is placed in an etching tank for secondary etching. After the secondary etching is completed, it is washed again with circulating water, dried after cleaning, and inspected after drying. After passing the inspection, it is packaged and stored. In step 9), the secondary etching operation is performed as follows:

[0047] Place the titanium alloy plate in the corrosion tank and completely immerse it in the corrosion liquid. Use a tool to shake the titanium alloy plate back and forth in the corrosion liquid, and make sure that the thickness of the titanium alloy plate eroded does not exceed 0.01mm.

[0048] The etching solution is a mixture of hydrofluoric acid, nitric acid and water, wherein the concentration of nitric acid is 300 g / l and the concentration of hydrofluoric acid is 20 g / l. During the etching operation, the temperature of the etching solution is maintained at 15°C.

[0049] In step 9), the secondary cleaning operation is as follows:

[0050] During cleaning, the titanium alloy plate was placed in a cleaning tank and cleaned with warm water at a temperature of 20° C. for 1 minute.

[0051] Example 2

[0052] The present invention provides a forming process for a bulletproof layer of a titanium alloy bulletproof vest, comprising the following steps:

[0053] Step 1): Select a TC4 grade titanium alloy plate, perform defect detection on the titanium alloy plate, and then use circulating water to clean the surface after defect detection;

[0054] Step 2): After cleaning, the titanium alloy plate is placed in a corrosion tank to perform a corrosion operation on the surface of the titanium alloy plate; the corrosion tank is provided with a corrosion liquid, which is a mixture of hydrofluoric acid, nitric acid and water, wherein the nitric acid is: 356g / l; the concentration of hydrofluoric acid is: 29g / l; during the corrosion operation, the temperature of the corrosion liquid is maintained at 35°C, the titanium alloy plate is placed in the corrosion tank and completely immersed in the corrosion liquid, and the titanium alloy plate is shaken back and forth in the corrosion liquid using a tool, so that the thickness of the titanium alloy plate eroded does not exceed 0.02mm; wherein the purpose of the corrosion operation is to remove contamination on the surface of the titanium alloy plate.

[0055] Step 3): During the corrosion operation, the titanium alloy plate is washed with circulating water and dried after washing. During the washing process, the titanium alloy plate is first placed in a cold washing tank and washed three times with warm water at a temperature of 40°C. During the washing process, compressed air is introduced into the cold washing tank and stirred. Then, the plate is transferred to a hot washing tank and hot water at a temperature of 80°C is used for hot washing. During the washing process, compressed air is introduced into the hot washing tank and stirred.

[0056] Step 4): After drying, place the titanium alloy plate into a baking furnace and bake it at a constant temperature of 200°C for 30 minutes. After baking, take it out and keep it at a temperature not lower than 100°C and spray a layer of glass lubricant to form a protective layer; the glass lubricant is aluminum oxide; the thickness of the protective layer is 0.08mm. The purpose of the protective layer is to protect the surface of the product from being contaminated at high temperatures. At the same time, the product is taken out after heat treatment. When it is taken out, it is easy to separate because of the protective layer. Otherwise, the products will be pressed together and cannot be separated. If they are forced to be separated, the product will be deformed.

[0057] Step 5): After spraying, place the titanium alloy plate in the tooling, and then place the tooling in a vacuum furnace for heat treatment. The heating treatment includes: maintaining the vacuum degree of the vacuum furnace ≤6.5x10 -2 Pa, first heat the vacuum furnace to 850℃ and keep it warm for 30 minutes, then continue to heat it to 940℃ and keep it warm for 60 minutes, cool it after the insulation is completed, and cool it to below 200℃ before taking it out of the vacuum furnace; the tooling includes a base, a pressure plate and a pressure block assembly, the titanium alloy plate is placed on the base, and then the pressure plate is placed on the base, the pressure block assembly is set on the side end face of the base, and is used for positioning and fixing the position between the base and the pressure plate. The titanium alloy plate is placed between the base and the pressure plate, and the titanium alloy plate is heated at high temperature in a vacuum environment (first heat the vacuum furnace to 850℃ and keep it warm for 30 minutes, then continue to heat it to 940℃ and keep it warm for 60 minutes, during which the titanium alloy plate is in a softening process), and at the same time, the titanium alloy plate is pressed and formed by the base and the pressure plate;

[0058] Step 6): Using a laser cutting machine to cut the heat-treated titanium alloy plate according to product specifications;

[0059] Step 7): After cutting, perform defect detection again;

[0060] Step 8): After the test is completed, place the titanium alloy plate in a clean water tank and use 40°C warm water to clean the protective layer on the surface of the titanium alloy plate. This step ensures that the protective layer is completely cleaned. If there is any residue, it will contaminate the etching solution during the next process.

[0061] Step 8): After cleaning, the titanium alloy plate is placed in the etching tank to perform a secondary etching operation on the surface of the titanium alloy plate. After the secondary etching is completed, it is washed again with circulating water, dried after cleaning, and inspected after drying. After passing the inspection, it is packaged and stored. In step 9), the secondary etching operation is performed as follows:

[0062] Place the titanium alloy plate in the corrosion tank and completely immerse it in the corrosion liquid. Use a tool to shake the titanium alloy plate back and forth in the corrosion liquid, and make sure that the thickness of the titanium alloy plate eroded does not exceed 0.01mm.

[0063] The etching solution is a mixture of hydrofluoric acid, nitric acid and water, wherein the concentration of nitric acid is 330 g / l and the concentration of hydrofluoric acid is 25 g / l. During the etching operation, the temperature of the etching solution is maintained at 35°C.

[0064] In step 9), the secondary cleaning operation is as follows: during cleaning, the titanium alloy plate is placed in a cleaning tank and cleaned with warm water at a temperature of 40° C. for 2 minutes.

[0065] Example 3

[0066] The present invention provides a forming process for a bulletproof layer of a titanium alloy bulletproof vest, comprising the following steps:

[0067] Step 1): Select a TC4 grade titanium alloy plate, perform defect detection on the titanium alloy plate, and then use circulating water to clean the surface after defect detection;

[0068] Step 2): After cleaning, the titanium alloy plate is placed in a corrosion tank to perform a corrosion operation on the surface of the titanium alloy plate; the corrosion tank is provided with a corrosion liquid, which is a mixture of hydrofluoric acid, nitric acid and water, wherein the concentration of nitric acid is: 300g / l; the concentration of hydrofluoric acid is: 22g / l. During the corrosion operation, the temperature of the corrosion liquid is maintained at 25°C, the titanium alloy plate is placed in the corrosion tank and completely immersed in the corrosion liquid, and the titanium alloy plate is shaken back and forth in the corrosion liquid using a tool, so that the thickness of the titanium alloy plate eroded does not exceed 0.02mm; wherein the purpose of the corrosion operation is to remove contamination on the surface of the titanium alloy plate.

[0069] Step 3): During the corrosion operation, the titanium alloy plate is washed with circulating water and dried after washing. During the washing process, the titanium alloy plate is first placed in a cold washing tank and washed twice with warm water at a temperature of 30°C. During the washing process, compressed air is introduced into the cold washing tank and stirred. Then, the plate is transferred to a hot washing tank and hot water at a temperature of 70°C is used for hot washing. During the washing process, compressed air is introduced into the hot washing tank and stirred.

[0070] Step 4): After drying, place the titanium alloy plate into a baking furnace and bake it at a constant temperature of 150°C for 25 minutes. After baking, take it out and keep it at a temperature not lower than 100°C and spray a layer of glass lubricant to form a protective layer; the glass lubricant is aluminum oxide; the thickness of the protective layer is 0.07mm. The purpose of the protective layer is to protect the surface of the product from being contaminated at high temperatures. At the same time, the product is taken out after heat treatment. When it is taken out, it is easy to separate the protective layer. Otherwise, the products will be pressed together and cannot be separated. If they are forced to be separated, the product will be deformed.

[0071] Step 5): After spraying, place the titanium alloy plate in the tooling, and then place the tooling in a vacuum furnace for heat treatment. The heating treatment includes: maintaining the vacuum degree of the vacuum furnace ≤6.5x10 -2 Pa, first heat the vacuum furnace to 800℃ and keep it warm for 25 minutes, then continue to heat it to 920℃ and keep it warm for 50 minutes, cool it after the insulation is completed, and cool it to below 200℃ before taking it out of the vacuum furnace; the tooling includes a base, a pressure plate and a pressure block assembly 3, the titanium alloy plate is placed on the base, and then the pressure plate is placed on the base, the pressure block assembly 3 is set on the side end face of the base, and is used for positioning and fixing the position between the base and the pressure plate. The titanium alloy plate is placed between the base and the pressure plate, and the titanium alloy plate is heated at high temperature in a vacuum environment (first heat the vacuum furnace to 800℃ and keep it warm for 25 minutes, then continue to heat it to 920℃ and keep it warm for 50 minutes. During this process, the titanium alloy plate is in a softening process), and at the same time, the titanium alloy plate is pressed and formed by the base and the pressure plate;

[0072] Step 6): Using a laser cutting machine to cut the heat-treated titanium alloy plate according to product specifications;

[0073] Step 7): After cutting, perform defect detection again;

[0074] Step 8): After the test is completed, place the titanium alloy plate in a clean water tank and use 40°C warm water to clean the protective layer on the surface of the titanium alloy plate. This step ensures that the protective layer is completely cleaned. If there is any residue, it will contaminate the etching solution during the next process.

[0075] Step 9): After cleaning, the titanium alloy plate is placed in the etching tank to perform a secondary etching operation on the surface of the titanium alloy plate. After the secondary etching is completed, it is washed again with circulating water, dried after cleaning, and inspected after drying. After passing the inspection, it is packaged and stored. In step 9), the secondary etching operation is performed as follows:

[0076] Place the titanium alloy plate in the corrosion tank and completely immerse it in the corrosion liquid. Use a tool to shake the titanium alloy plate back and forth in the corrosion liquid, and make sure that the thickness of the titanium alloy plate eroded does not exceed 0.01mm.

[0077] The etching solution is a mixture of hydrofluoric acid, nitric acid and water, wherein the concentration of nitric acid is 320 g / l and the concentration of hydrofluoric acid is 23 g / l. During the etching operation, the temperature of the etching solution is maintained at 30°C.

[0078] In step 9), the secondary cleaning operation is as follows: during cleaning, the titanium alloy plate is placed in a cleaning tank and cleaned with warm water at a temperature of 30° C. for 1.5 minutes.

[0079] In Examples 1 through 3, the effects of varying conditions on the final product shape were minimal. The final product was measured primarily for the clearance between the insert plate and the gauge, as well as the straightness of the product's edges. The clearance was measured using a needle probe and ranged from 0 to 1.8 mm.

[0080] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A forming process for a bulletproof layer of a titanium alloy bulletproof vest, characterized in that: The steps include: Step 1): The titanium alloy plate is subjected to defect detection, and the surface is cleaned using circulating water after the defect detection; Step 2): After cleaning, the titanium alloy plate is placed in a corrosion tank to perform corrosion operations on the surface of the titanium alloy plate; In step 2), a corrosive solution is provided in the etching tank, wherein the corrosive solution is a mixture of hydrofluoric acid, nitric acid, and water, wherein the concentration of nitric acid is 288 to 356 g / l; the concentration of hydrofluoric acid is 15.5 to 29 g / l. During the etching operation, the temperature of the corrosive solution is maintained at 15 to 35° C. The titanium alloy plate is placed in the etching tank and completely immersed in the corrosive solution. The titanium alloy plate is shaken back and forth in the corrosive solution using a tool, and the thickness of the titanium alloy plate eroded does not exceed 0.02 mm. Step 3): Use circulating water to clean during the corrosion operation and dry after cleaning; In step 3), the titanium alloy plate is removed from the corrosion tank, placed in a cold cleaning tank and cleaned 1 to 3 times with circulating water, and compressed air is introduced into the cold cleaning tank and stirred during the cleaning process. The plate is then transferred to a hot cleaning tank and hot water at a temperature of 60 to 80° C. is used for hot cleaning, and compressed air is introduced into the hot cleaning tank and stirred during the cleaning process. Step 4): After drying, the titanium alloy plate is placed in a baking furnace and baked at a constant temperature of 100-200° C. for 20-30 minutes. After baking, the titanium alloy plate is taken out and kept at a temperature not lower than 100° C., and a layer of glass lubricant is sprayed on the upper and lower surfaces of the titanium alloy plate to form a protective layer. The thickness of the protective layer is 0.06-0.08 mm. Step 5): After spraying, the titanium alloy plate is placed in the tooling, and then the tooling is placed in a vacuum furnace for heat treatment and pressed into shape using the tooling. The heat treatment includes: maintaining the vacuum degree of the vacuum furnace ≤6.5x10 -2 Pa, first heat the vacuum furnace to 750-850℃ and keep it warm for 20-30min, then continue heating to 900-940℃ and keep it warm for 30-60min, then cool it down to below 200℃ and take it out of the vacuum furnace; Step 6): Using a laser cutting machine to cut the heat-treated titanium alloy plate into finished product specifications; Step 7): After cutting, perform defect detection again; Step 8): After the test is completed, place the titanium alloy plate in a clean water tank and use warm water at 20-40°C to clean the protective layer on the surface of the titanium alloy plate; Step 9): After the protective layer is cleaned, the surface of the titanium alloy plate is placed in an etching tank for secondary etching. During the secondary etching process, the plate is cleaned with circulating water. After cleaning, the plate is dried. After drying, the finished product is inspected and packaged for storage after passing the inspection. The secondary corrosion operation is as follows: Place the titanium alloy plate in the corrosion tank and completely immerse it in the corrosion liquid. Use a tool to shake the titanium alloy plate back and forth in the corrosion liquid, and make sure that the thickness of the titanium alloy plate eroded does not exceed 0.01mm. The etching solution is a mixture of hydrofluoric acid, nitric acid and water, wherein the concentration of the mixture of nitric acid and water is 300-330 g / l; the concentration of the mixture of hydrofluoric acid and water is 20-25 g / l. During the etching operation, the temperature of the etching solution is maintained at 15-35°C.

2. The forming process of the bulletproof layer of titanium alloy bulletproof vest according to claim 1 is characterized in that: In step 1), the titanium alloy plate is a TC4 grade titanium alloy plate.

3. The forming process of the bulletproof layer of titanium alloy bulletproof vest according to claim 1 is characterized in that: The glass lubricant is aluminum oxide.

4. The forming process of the bulletproof layer of titanium alloy bulletproof vest according to claim 1 is characterized in that: The tooling includes a base, a pressure plate and a pressure block assembly. The titanium alloy plate is placed on the base, and then the pressure plate is placed on the base. The pressure block assembly is arranged on the side end surface of the base to locate and fix the position between the base and the pressure plate.

5. The forming process of the bulletproof layer of titanium alloy bulletproof vest according to claim 4 is characterized in that: The titanium alloy plate is placed between the base and the pressing plate. The titanium alloy plate is heated at high temperature in a vacuum environment and simultaneously pressed and formed by the base and the pressing plate.

6. The forming process of the bulletproof layer of titanium alloy bulletproof vest according to claim 1 is characterized in that: In step 9), the secondary cleaning operation is as follows: The titanium alloy plate is taken out from the corrosion tank, and then placed in a cleaning tank and cleaned with warm water at a temperature of 20 to 40° C. for 1 to 2 minutes.

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