Manufacturing method for producing metal mold of acrylonitrile impregnated product and hand mold

Abstract

The application relates to a manufacturing method for manufacturing a metal model for a nitrile dip product and a hand mold thereof, and comprises the following steps: respectively die forming metal plates into an upper palm part and a lower palm part, welding the upper palm part and the lower palm part after splicing to form a palm part; forming a metal pipe into an arm part, splicing and welding the arm part on the palm part; welding a base on the arm part to form a hand mold; performing sand blasting treatment on the hand mold; and forming a corrosion-resistant hardening film layer on the outer surface of the hand mold through physical treatment or chemical treatment. The application has the effect of improving the corrosion resistance against chlorine ions.

Description

Technical Field

[0001] This application relates to the technical field of metal model production, and in particular to a method for manufacturing a metal model for producing nitrile-impregnated products and a hand mold thereof. Background Technology

[0002] Nitrile butadiene rubber (NBR) products are mainly processed from NBR rubber and are used in fields such as medical, hygiene, cosmetic surgery, food processing, and chemical industries, serving functions such as isolation, protection, and infection prevention. NBR rubber does not contain protein, so it will not cause allergic reactions in the human body. It has antistatic, aging-resistant, and oil-resistant properties, is easy to mold, offers flexible shaping, and has wide applicability and high flexibility. It also possesses high tensile strength, puncture resistance, tensile strength, and abrasion resistance.

[0003] The manufacturing process of nitrile butadiene film products includes nitrile impregnation, molding, vulcanization, surface treatment, and dust-free cleaning. The manufacturing of nitrile impregnated products begins with acid washing, alkali washing, chlorine washing, rinsing, and drying of the mold. Then, the mold is impregnated with a coagulant that can easily deteriorate the latex liquefaction material. Vulcanization then occurs through the nitrile film layer impregnated on the mold, and finally, the nitrile product is demolded. The temperature range for the coagulant solution used in the mold impregnation is 60-80 degrees Celsius, the impregnation temperature for nitrile is 20-60 degrees Celsius, and the curing temperature is 120-130 degrees Celsius. Acid washing of the mold uses liquids such as nitric acid, alkali neutralization uses liquids such as sodium hydroxide, and finally, chlorine rinsing is performed for 20-30 minutes. Therefore, the molds used to prepare nitrile latex products need to be acid and alkali resistant, possess good corrosion resistance, be oxidation resistant, rust-free, and have stable thermal shock resistance during thermal conversion. The molds also need to have uniform and consistent liquefied nitrile and latex coating, and good demolding ability after the nitrile latex has cured and vulcanized.

[0004] The production of nitrile latex gloves places the most stringent requirements on the molds. After each use, the molds undergo a first chlorine ion cleaning at 100-500 PPM, an acid wash at pH 1-3, and then an alkaline wash at pH 10-11, with a cleaning temperature of 50-60℃. Therefore, they must have good resistance to acid and alkali corrosion and chlorine washing. Regarding the above-mentioned technologies, the inventors believe that although molds made of stainless steel have good resistance to acid and alkali corrosion and good thermal shock resistance, they do not meet the established requirements for resistance to chloride ion corrosion, and therefore there is room for improvement. Summary of the Invention

[0005] To improve the corrosion resistance against chloride ions, this application provides a method for manufacturing a metal mold for producing nitrile-impregnated products and a hand mold thereof.

[0006] The manufacturing method of a metal mold for producing nitrile-impregnated products provided in this application adopts the following technical solution:

[0007] A method for manufacturing a metal mold for producing nitrile-impregnated products includes the following steps:

[0008] Metal sheets are molded into the upper part of the palm and the lower part of the palm, and the upper and lower parts of the palm are spliced ​​together and welded to form the palm part.

[0009] The metal tubing is formed into the arm section, and the arm section is spliced ​​and welded onto the palm section;

[0010] The base is welded to the arm to form a hand-shaped mold;

[0011] Sandblasting is performed on the hand-shaped mold.

[0012] A corrosion-resistant and hardened film is formed on the outer surface of the hand-shaped mold through physical or chemical treatment.

[0013] Preferably, the anti-corrosion and hardening film layer is formed on the outer surface of the hand mold by physical treatment, including the following steps;

[0014] After passivating the surface of the hand mold, clean the outer surface of the hand mold;

[0015] A nano-ceramic coating is formed on the outer surface of the hand-shaped mold by spraying.

[0016] The surface of the nano-ceramic coating on the outer surface of the hand mold is roughened by sandblasting.

[0017] Preferably, the thickness of the nano-ceramic coating is 0.01mm-0.07mm.

[0018] Preferably, a nano-ceramic coating is formed on the outer surface of the hand mold by spraying and then cured at a curing temperature of 250°C for 30 minutes.

[0019] Preferably, forming an anti-corrosion and hardened film layer on the outer surface of the hand-shaped mold through chemical treatment includes the following steps:

[0020] Place the hand-shaped mold on the anode and cathode hanger;

[0021] A chrome plating layer is formed on the outer surface of the hand-shaped mold by electroplating;

[0022] The chrome plating layer on the outer surface of the hand-shaped mold is roughened by sandblasting.

[0023] Preferably, before forming a chromium plating layer on the outer surface of the hand mold by electroplating, the outer surface of the hand mold is subjected to alkaline washing, acid washing and rust removal treatment.

[0024] Preferably, the anode and cathode mounting bracket includes a main anode rod and a plurality of auxiliary anode rods arranged laterally on the main anode rod, with adjacent auxiliary anode rods spaced apart, and the main anode rod and the auxiliary anode rods being hollow inside and communicating with each other;

[0025] Both ends of the secondary anode rod are provided with rotating seats. The hand-shaped mold is installed vertically on the rotating seats. Anode wires are connected to the main anode rod and the secondary anode rod. A cathode wire is passed through the main anode rod. The cathode wire passes through the secondary anode rod and the rotating seats to connect with the inner wall of the hand-shaped mold.

[0026] Preferably, the rotating seat includes a rotating rod rotatably installed inside the sub-anode rod, the upper end of the rotating rod extending outside the sub-anode rod, a rotating seat being installed at the upper end of the rotating rod, the rotating seat being adapted to the base of the hand-shaped mold, and a drive motor for driving the rotating rod to rotate is provided inside the sub-anode rod;

[0027] A conductive rod is inserted and installed at the center of the rotating seat. The upper end of the conductive rod is used to contact the inner wall of the hand-shaped mold. The lower end of the conductive rod extends along the axial direction of the rotating rod. A conductive slip ring is installed inside the auxiliary anode rod. The moving ring of the conductive slip ring is connected to the lower end of the conductive rod, and the stationary ring of the conductive slip ring is connected to the cathode wire.

[0028] Preferably, the upper end of the conductive rod has several main forked segments that are distributed upwards, and the main forked segments are used to contact the finger gaps of the palm part of the hand mold;

[0029] The upper end of the conductive rod has several sub-forked segments that spread outwards, and these sub-forked segments are used to contact the position of the arm part of the hand-shaped mold.

[0030] The hand mold provided in this application adopts the following technical solution:

[0031] A hand mold, the hand mold being manufactured by the manufacturing method for producing metal models for nitrile impregnation products as described in the above technical solution.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. The hand-shaped mold made of metal sheet has fast heat conduction, rapid heating and cooling, which can greatly reduce fuel consumption and machine investment costs during the manufacturing of various gloves;

[0034] 2. The metal hand mold of this application has high hardness and its surface is not easily worn, thus improving the quality of the dip-molded gloves.

[0035] 3. This application can effectively solve the problems of pitting corrosion, stress corrosion and localized corrosion caused by chloride ions by forming an anti-corrosion hardening film layer on the outer surface of the hand mold, and effectively improve the corrosion resistance to chloride ions. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the manufacturing process for producing metal models used in the production of nitrile-impregnated products.

[0037] Figure 2 This is a schematic diagram of the physical treatment process for the anti-corrosion hardening film layer.

[0038] Figure 3 This is a schematic diagram of the chemical treatment process for the anti-corrosion hardening film.

[0039] Figure 4 This is a structural diagram illustrating the texture characteristics of coarse finger hemp.

[0040] Figure 5 This is a schematic diagram of the first structure of the anode and cathode hanger in one embodiment.

[0041] Figure 6 This is a schematic diagram of the second structure of the anode and cathode hanger in one embodiment.

[0042] Figure 7 This is a schematic diagram of the structure of the anode and cathode hanger in another embodiment.

[0043] Figure 8 This is a schematic diagram of the hand-shaped mold installation.

[0044] Figure 9 This is an exploded view of the secondary anode rod of the hand-shaped mold.

[0045] Figure 10 This is a schematic diagram of the rotating base.

[0046] Explanation of reference numerals in the attached drawings: 1. Hand-shaped mold; 2. Anode and cathode hangers; 21. Main anode rod; 22. Secondary anode rod; 23. Mounting base; 24. Mounting bracket; 25. Cathode rod; 26. Cathode conductive wire; 27. Anode wire; 28. Cathode wire; 3. Rotating seat; 31. Rotating rod; 32. Rotating seat; 33. Dynamic sealing ring; 34. Drive motor; 35. First drive gear; 36. Second drive gear; 4. Conductive rod; 41. Main bifurcation section; 42. Secondary bifurcation section; 5. Conductive slip ring; 51. Moving ring; 52. Stationary ring. Detailed Implementation

[0047] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0048] The production of nitrile latex gloves places the most stringent requirements on the molds. After each use, the molds are first cleaned with 100-500 PPM of chloride ions, then acid-washed at pH 1-3, and finally alkaline-washed at pH 10-11. The cleaning temperature is 50-60℃. Therefore, the molds must have good resistance to acid and alkali corrosion and chlorine washing.

[0049] Ceramic molds are commonly used in the production of nitrile rubber, but they have the following disadvantages: 1. Low product qualification rate, around 85%; 2. High total shrinkage rate, 13%-18%; 3. Uneven product surface, with black spots, etc.; 4. Short service life, with existing ceramic molds typically having an online service life of 3-8 months in nitrile rubber production; 5. Poor thermal shock resistance; 6. Poor dimensional accuracy and excessive wall thickness, typically 4-8 mm; 7. Poor thermal conductivity, resulting in slow heating and cooling, leading to excessive heat loss during production; 8. Heavy weight.

[0050] Given the aforementioned shortcomings and deficiencies of existing ceramic models, metal models made of stainless steel offer advantages such as long online service life, strong resistance to acid and alkali corrosion, good thermal shock resistance, light weight, easy product demolding, good thermal conductivity, reduced energy consumption in product production, and significantly improved resistance to chloride ion pitting corrosion, stress corrosion, and corrosion fatigue. However, metal models do not meet the established requirements for chloride ion corrosion resistance.

[0051] Example 1

[0052] Based on the above technical content, this application proposes a method for manufacturing a metal model for producing nitrile-impregnated products, referring to... Figure 1 As shown, it includes the following steps:

[0053] In step S100, the metal sheet is molded into the upper part of the palm and the lower part of the palm respectively, and the upper part of the palm and the lower part of the palm are spliced ​​together and welded to form the palm part.

[0054] According to the technical solution defined in step S100, specifically, the metal sheet is made of stainless steel. The metal sheet is cut into square pieces, and then molded into an upper and lower part of the palm. After molding, the edges of the upper and lower parts of the palm are trimmed. The trimmed upper and lower parts of the palm are symmetrical. The upper and lower parts of the palm are joined together, and then welded along the seam to form a complete palm. In one embodiment, the welding method can be laser welding.

[0055] After the lower and upper parts of the palm are welded together to form the palm, the weld seam of the palm is ground and polished, and the wrist end face of the palm is trimmed to make it flat and uniform.

[0056] Step S200: The metal tube is formed into an arm part, and the arm part is spliced ​​and welded onto the palm part.

[0057] According to the technical solution defined in step S200, specifically, the metal tube is formed multiple times into an arm section under the action of an expansion mold, and the arm section takes the shape and size of a human arm. Then, by aligning the upper end of the arm section with the lower end of the palm section, the arm section and the palm section are joined together and connected by laser welding. Subsequently, the weld seam between the arm section and the palm section is polished.

[0058] Step S300: Weld the base to the arm to form a hand mold 1.

[0059] According to the technical solution defined in step S300, specifically, the base is welded to the lower end of the arm by argon arc welding. After the base is welded, it will become a complete hand mold 1. Then, the hand mold 1 is polished as a whole to remove the welding scars on the hand mold 1.

[0060] The hand-shaped mold 1 can be connected to the production line via the base. The hand-shaped mold 1 has a hollow internal structure with a wall thickness of 0.3mm-2mm and a continuous streamlined shape. Except for the base opening, all other parts of the hand-shaped mold 1 are sealed to prevent leakage and air penetration. This airtight seal at the nitrile latex impregnation area ensures that the nitrile latex liquid does not penetrate into the interior of the hand-shaped mold 1 during impregnation. The uniform wall thickness of the hand-shaped mold 1 results in consistent wall thickness and color of the nitrile latex product after film formation. The smooth, streamlined structure ensures a smooth, wrinkle-free surface and a full, rounded shape after film formation.

[0061] Step S400: Sandblasting is performed on the hand mold 1.

[0062] According to the technical solution defined in step S400, specifically, before sandblasting the hand mold 1, it is necessary to process a rough finger texture on the hand mold 1, that is, to form a shallow honeycomb product surface with a roughness Ra = 8-25μm and a rough finger texture unevenness of 0.05-0.95mm.

[0063] Reference Figure 4As shown, there are three options for the texture characteristics of the coarse finger texture. Option 1 is that the fingers of hand mold 1 have a coarse finger texture with a 0.5-3.0 grit sandblasted finish, while the rest of the surface is polished. Option 2 is that the fingers of hand mold 1 have a 0.5-3.0 grit sandblasted finish, while the palm and forearm have a 60-150 grit sandblasted finish. Option 3 is that the palm of hand mold 1 has a 0.5-3.0 grit sandblasted finish, while the forearm has a 60-150 grit sandblasted finish. The coarse finger texture of hand mold 1 can be created using an etching process. After masking the areas of hand mold 1 where the coarse finger texture is not to be processed using a masking fixture, the coarse finger texture can then be etched into the unmasked areas.

[0064] By tailoring the application to different nitrile latex products, localized or full-area coarse tingling effects can be achieved. This results in a uniform textured surface on nitrile latex products, increasing surface friction and providing anti-slip properties, thus enhancing the grip of the nitrile latex products.

[0065] After the rough finger texture is processed in the hand mold 1, the masking fixture is removed, and the entire hand mold 1 is then sandblasted with a 60-150 mesh material using a sandblasting machine.

[0066] Step S500: A corrosion-resistant and hardened film layer is formed on the outer surface of the hand mold 1 by physical or chemical treatment.

[0067] According to the technical solution defined in step S500, referring to Figure 2 As shown, specifically, forming an anti-corrosion and hardening film layer on the outer surface of the hand mold 1 through physical treatment includes the following steps;

[0068] Step A511: After passivating the surface of the hand mold 1, clean the outer surface of the hand mold 1;

[0069] Step A512: A nano-ceramic coating is formed on the outer surface of the hand mold 1 by spraying.

[0070] Step A513: Roughen the surface of the nano-ceramic coating on the outer surface of the hand mold 1 by sandblasting.

[0071] The surface of the hand mold 1 undergoes passivation treatment, primarily to harden the surface material and increase its wear resistance. When cleaning the outer surface of the hand mold 1, it is essential to ensure it is clean, dry, free of dust, water, oil, and wax. This is crucial for ensuring the effective application of the subsequent nano-ceramic coating.

[0072] In this embodiment, the thickness of the nano-ceramic coating is 0.01mm-0.07mm, preferably 0.05mm. The nano-ceramic coating can effectively isolate the metal material from external corrosive substances, greatly reducing the corrosion of stainless steel by chloride ions and thus providing corrosion protection.

[0073] The nano-ceramic coating can be a two-component ceramic nano-coating, which is well-suited for materials such as carbon steel and stainless steel. It exhibits excellent high-temperature resistance, is waterproof and flame-retardant, and resistant to high-temperature corrosion. The coating has good thermal conductivity (20 W / (m·K)) and excellent adhesion to the outer surface of the hand mold 1, achieving a grade of 0 in the cross-cut adhesion test. It has high hardness (9H), with almost no change in hardness at high temperatures, and good wear resistance. The coating surface has extremely low surface energy (1.8 × 10⁻² N / m), making it very difficult for substances to adhere. It exhibits excellent resistance to chemical corrosion, acids, alkalis, solvents, and boiling in salt water. It is resistant to thermal shock and exhibits good thermal shock resistance (resistant to heat exchange, the coating does not crack or peel). The nano-coating is safe, environmentally friendly, and non-toxic, and has passed FDA (food-grade) standard testing and certification.

[0074] In this process, a nano-ceramic coating is formed on the outer surface of the hand mold 1 by spraying and then cured. The curing temperature is 250℃ and the curing time is 30 minutes. During the curing process of the nano-ceramic coating, it is forbidden to touch it.

[0075] In this embodiment, when roughening the surface of the nano-ceramic coating on the outer surface of the hand mold 1 by sandblasting, 100-mesh sandblasting can be performed to achieve a roughness Ra = 0.6-1.2μm, thereby addressing the hydrophobicity of the nano-ceramic coating and ensuring that the nano-ceramic coating has good nitrile latex wetting and coating performance.

[0076] According to the technical solution defined in step S500, specifically, a corrosion-resistant and hardened film layer is formed on the outer surface of the hand mold 1 through chemical treatment, referring to... Figure 3 As shown, it includes the following steps:

[0077] Step B511: Place the hand-shaped mold 1 on the anode and cathode hanger 2;

[0078] Step B512: A chromium plating layer is formed on the outer surface of the hand mold 1 by electroplating;

[0079] Step B513: Roughen the chrome plating layer on the outer surface of the hand mold 1 by sandblasting.

[0080] Before forming a chromium plating layer on the outer surface of the hand mold 1 through electroplating, the outer surface of the hand mold 1 will be subjected to alkaline washing, acid washing, and rust removal treatment. The purpose of alkaline washing is to remove grease, dirt, and oxides from the outer surface of the hand mold 1, and the purpose of acid washing is to remove the oxide layer and surface impurities from the outer surface of the hand mold 1. After alkaline washing, acid washing, and rust removal treatment, it needs to be rinsed with water before entering the electroplating bath for electroplating treatment.

[0081] A chromium plating layer needs to be electroplated onto the outer surface of the hand mold 1. The electroplating bath contains a chromic acid solution. By placing the hand mold 1 on the anode and cathode hangers 2, connecting the hand mold 1 to the cathode of a DC power supply, and connecting the anode metal rod in the electroplating bath to the anode of the DC power supply, a chromium plating layer can be electroplated onto the outer surface of the hand mold 1. In this embodiment, the thickness of the chromium plating layer is 0.01mm-0.06mm, and the chromium plating layer is a dense chromium-hardened anti-corrosion film layer, thus having excellent resistance to chloride ion corrosion. The hardness of the chromium plating layer is 800-900HV.

[0082] In this embodiment, when roughening the chromium plating layer on the outer surface of the hand mold 1 by sandblasting, 100-mesh sandblasting can be performed, with a roughness Ra = 0.6-1.2μm, to ensure that the chromium plating layer has good nitrile latex wetting and coating performance.

[0083] It is worth noting that multiple hand-shaped molds 1 will be placed together on the anode and cathode hangers 2, and then the anode and cathode hangers 2 and the hand-shaped molds 1 will be taken into the electroplating bath for electroplating.

[0084] The following is an explanation of Yin-Yang pole pendant 2.

[0085] In one embodiment, refer to Figure 5 and Figure 6 As shown, the anode and cathode mounting bracket 2 includes a main anode rod 21 and several auxiliary anode rods 22 arranged horizontally on the main anode rod 21. Adjacent auxiliary anode rods 22 are arranged vertically and spaced apart from each other.

[0086] Both ends of the secondary anode rod 22 are provided with mounting seats 23, which are used to mount the base of the hand mold 1. The hand mold 1 is mounted vertically on the mounting seats 23, which are made of insulating plastic. Above each secondary anode rod 22, the main anode rod 21 is provided with a mounting frame 24, which is made of plastic. The uppermost mounting frame 24 is provided with a cathode rod 25, and several cathode conductive wires 26 are provided on the mounting frame 24. All the cathode conductive wires 26 converge and connect to the cathode rod 25, extending into the finger gaps of the hand mold 1 and contacting the hand mold 1. The cathode conductive wires 26 on the lower mounting frame 24 are connected to the cathode rod 25 via wires.

[0087] An anode wire 27 and a cathode wire 28 are led out from the DC power supply. By connecting the cathode rod 25 to the cathode wire 28, and connecting the main anode rod 21 and the auxiliary anode rod 22 to the anode wire 27, the hand-shaped mold 1 is plated with a chromium layer in the electroplating bath.

[0088] It is worth noting that both the main anode rod 21 and the auxiliary anode rod 22 are made of metal. The metal material of the main anode rod 21 and the auxiliary anode rod 22 can be adjusted according to the requirements of the plating metal. In this embodiment, in order to electroplate a chromium layer onto the outer surface of the hand-shaped mold 1, the main anode rod 21 and the auxiliary anode rod 22 are made of lead-calcium alloy, which is required for chromium plating. The cathode rod 25 is made of metal, and the cathode rod 25 can be made of conductive metals such as copper, iron, and aluminum.

[0089] In another embodiment, refer to Figure 7 and Figure 8 As shown, the anode and cathode mounting bracket 2 includes a main anode rod 21 and several auxiliary anode rods 22 arranged horizontally on the main anode rod 21. Adjacent auxiliary anode rods 22 are arranged vertically and spaced apart. The main anode rod 21 and the auxiliary anode rods 22 are hollow inside and interconnected inside.

[0090] Both ends of the auxiliary anode rod 22 are provided with rotating seats 3. The hand-shaped mold 1 is mounted vertically on the rotating seats 3. An anode wire 27 and a cathode wire 28 are led out from the DC power supply. The anode wire 27 is connected to the main anode rod 21 and the auxiliary anode rod 22. The cathode wire 28 is inserted into the main anode rod 21. The cathode wire 28 passes through the auxiliary anode rod 22 and the rotating seat 3 to connect with the inner wall of the hand-shaped mold 1.

[0091] Both the main anode rod 21 and the auxiliary anode rod 22 are made of metal. The metal material of the main anode rod 21 and the auxiliary anode rod 22 can be adjusted according to the requirements of the plating metal. In this embodiment, in order to electroplate a chromium layer on the outer surface of the hand mold 1, the main anode rod 21 and the auxiliary anode rod 22 are made of lead-calcium alloy required for chromium plating.

[0092] The entire anode and cathode fixture 2, along with the hand-shaped mold 1, is placed into the electroplating bath. Anode wires 27 are connected to the main anode rod 21 and the auxiliary anode rod 22, and cathode wires 28 are connected to the hand-shaped mold 1, thereby achieving electroplating of a chromium layer on the outer surface of the hand-shaped mold 1.

[0093] It is worth noting that the ends of both the main anode rod 21 and the auxiliary anode rod 22 are sealed to prevent the electroplating liquid in the electroplating tank from entering the interior of the main anode rod 21 and the auxiliary anode rod 22. An insulating rubber layer is adhered to the inner wall of the main anode rod 21 and the auxiliary anode rod 22 to prevent them from contacting the cathode wire 28 inside.

[0094] When the anode wire 27 is connected to the main anode rod 21 and the auxiliary anode rod 22, it can be inserted into the interior of the main anode rod 21 and the auxiliary anode rod 22 for connection. The anode wire 27 can also be connected to the outer surface of the main anode rod 21 and the auxiliary anode rod 22. In order to solve the current end effect, the anode wire 27 will be connected at multiple positions on the main anode rod 21 and the auxiliary anode rod 22.

[0095] The rotating seat 3 is used to drive the hand mold 1 to rotate, so that when the main anode rod 21 and the auxiliary anode rod 22 are energized, the hand mold 1 can rotate on its own, so that each side of the hand mold 1 can face the main anode tube, thereby improving the uniformity of the chromium plating layer on the surface of the hand mold 1.

[0096] Reference Figure 8 and Figure 10 As shown, the rotating seat 3 includes a rotating rod 31 rotatably installed inside the sub-anode rod 22. The rotating rod 31 is arranged in a vertical direction, and the upper end of the rotating rod 31 extends out of the sub-anode rod 22. A rotating seat 32 is installed on the upper end of the rotating rod 31. The rotating seat 32 is adapted to the base of the hand mold 1. That is, the base of the hand mold 1 is provided with an installation port, and the rotating seat 32 is provided with an installation block that fits into the installation port. The rotating seat 32 is made of plastic.

[0097] It is worth noting that a dynamic sealing ring 33 is provided at the position where the rotating rod 31 passes through the sub-anode rod 22. The dynamic sealing ring 33 can prevent liquid in the electroplating tank from entering the interior of the sub-anode rod 22.

[0098] The auxiliary anode rod 22 is equipped with a drive motor 34 for driving the rotating rod 31 to rotate. Specifically, a first drive gear 35 is coaxially mounted on the rotating rod 31, and a second drive gear 36 is mounted on the output shaft of the drive motor 34. The first drive gear 35 and the second drive gear 36 are meshed and connected. Both the first drive gear 35 and the second drive gear 36 are located inside the auxiliary anode rod 22. The drive motor 34 drives the rotating rod 31 to rotate through the second drive gear 36 and the first drive gear 35.

[0099] A conductive rod 4 is inserted and installed at the center of the rotating seat 32. The upper end of the conductive rod 4 is used to contact the inner wall of the hand mold 1. The lower end of the conductive rod 4 extends along the axial direction of the rotating rod 31. A conductive slip ring 5 is installed inside the auxiliary anode rod 22. The moving ring 51 of the conductive slip ring 5 is connected to the lower end of the conductive rod 4, and the stationary ring 52 of the conductive slip ring 5 is connected to the cathode wire 28.

[0100] Reference Figure 9 As shown, the upper end of the conductive rod 4 has several main branch segments 41 that extend upwards, and these main branch segments 41 are used to contact the finger gaps of the hand part of the hand mold 1. The upper end of the conductive rod 4 has several secondary branch segments 42 that extend outwards, and these secondary branch segments 42 are used to contact the arm part of the hand mold 1.

[0101] Both the main forked section 41 and the secondary forked section 42 are made of flexible conductive metal wire. Therefore, when the hand mold 1 is installed, the main forked section 41 and the secondary forked section 42 are gathered together. After the main forked section 41 and the secondary forked section 42 are placed inside the hand mold 1, the main forked section 41 will spread upward and the secondary forked section 42 will spread outward, thereby achieving contact between the main forked section 41 and the secondary forked section 42 and the inner wall surface of the hand mold 1.

[0102] By having the main forked section 41 contact the finger gaps on the palm, the problem of incomplete electroplating at the finger gaps on the palm, due to the complex shape of the hand mold 1, can be solved. Furthermore, the secondary forked section 42 can address the issue of uneven electroplating on the arm.

[0103] Example 2

[0104] A hand mold is manufactured by the manufacturing method for producing metal models for nitrile impregnation products as described in the above technical solution.

[0105] In summary, the hand mold 1 made of metal sheet of this application has fast heat conduction, rapid heating and cooling, thus greatly reducing fuel consumption and machine investment costs during the manufacturing of various gloves; the hand mold 1 made of metal material of this application has high hardness and its surface is not easily worn, thus improving the quality of the dip-molded gloves; the anti-corrosion hardening film layer formed on the outer surface of the hand mold 1 of this application can effectively solve the problems of pitting corrosion, stress corrosion and localized corrosion caused by chloride ions, and effectively improve the corrosion resistance to chloride ions.

[0106] It is worth noting that the nitrile impregnated products of this application can be used not only in the production of medical gloves and industrial gloves, but also, by replacing the hand mold with other molds, in the production of balloons, condoms, polymer elastic headgear or thin-walled polymer impregnated products.

[0107] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A manufacturing method for producing a metal mold for a nitrile impregnated product, characterized by, Includes the following steps: Metal sheets are molded into the upper part of the palm and the lower part of the palm, and the upper and lower parts of the palm are spliced ​​together and welded to form the palm part. The metal tubing is formed into the arm section, and the arm section is spliced ​​and welded onto the palm section; The base is welded to the arm to form a hand mold (1); The hand-shaped mold (1) is sandblasted. A corrosion-resistant and hardened film layer is formed on the outer surface of the hand mold (1) by chemical treatment; The process of forming a corrosion-resistant and hardened film layer on the outer surface of the hand mold (1) by chemical treatment includes the following steps: Place the hand-shaped mold (1) on the anode and cathode hanger (2); A chromium plating layer is formed on the outer surface of the hand mold (1) by electroplating; The chrome plating layer on the outer surface of the hand mold (1) is roughened by sandblasting; The anode and cathode mounting bracket (2) includes a main anode rod (21) and a number of auxiliary anode rods (22) arranged horizontally on the main anode rod (21). The auxiliary anode rods (22) are spaced apart from each other. The main anode rod (21) and the auxiliary anode rods (22) are hollow inside and interconnected. Both ends of the sub-anode rod (22) are provided with rotating seats (3). The hand-shaped mold (1) is installed vertically on the rotating seats (3). Anode wires (27) are connected to the main anode rod (21) and the sub-anode rod (22). A cathode wire (28) is passed through the main anode rod (21). The cathode wire (28) passes through the sub-anode rod (22) and the rotating seat (3) to connect with the inner wall of the hand-shaped mold (1).

2. The manufacturing method for a metal mold for acrylonitrile impregnated product according to claim 1, wherein Before forming a chromium plating layer on the outer surface of the hand mold (1) by electroplating, the outer surface of the hand mold (1) is subjected to alkaline washing, acid washing and rust removal treatment.

3. The method for manufacturing a metal model for producing nitrile-impregnated products according to claim 1, characterized in that, The rotating seat (3) includes a rotating rod (31) rotatably installed inside the sub-anode rod (22). The upper end of the rotating rod (31) extends out of the sub-anode rod (22). A rotating seat (32) is installed on the upper end of the rotating rod (31). The rotating seat (32) is adapted to the base of the hand mold (1). A drive motor (34) for driving the rotating rod (31) to rotate is provided inside the sub-anode rod (22). A conductive rod (4) is inserted and installed at the center of the rotating seat (32). The upper end of the conductive rod (4) is used to contact the inner wall of the hand mold (1). The lower end of the conductive rod (4) extends along the axial direction of the rotating rod (31). A conductive slip ring (5) is installed inside the auxiliary anode rod (22). The moving ring (51) of the conductive slip ring (5) is connected to the lower end of the conductive rod (4). The stationary ring (52) of the conductive slip ring (5) is connected to the cathode wire (28).

4. The method for manufacturing a metal model for producing nitrile-impregnated products according to claim 3, characterized in that, The upper end of the conductive rod (4) is distributed with several main branch segments (41), which are used to contact the finger gaps of the palm part of the hand mold (1). The upper end of the conductive rod (4) is distributed with several sub-forked segments (42) in all directions. The sub-forked segments (42) are used to contact the position of the arm part of the hand mold (1).

Images