Energy-saving method for manufacturing palm part of chlorine-resistant dual-phase steel hand mold

Abstract

This application relates to a method for manufacturing the palm portion of an energy-saving, chlorine-resistant, duplex stainless steel hand mold, comprising the following steps: Step S100, reverse stretching is performed on a metal sheet to create a reverse convex bulge at the middle finger position of the pre-formed palm portion to form a pre-formed sheet; Step S200, forward stretching is performed on the pre-formed sheet to obtain a blank left half or a blank right half of the palm portion; Step S300, the blank left half and blank right half are trimmed along the contour to obtain a left half and a right half of the palm; Step S400, the left half and right half of the palm are welded together to form the palm portion. This application solves the problem of stretching cracking during the palm portion manufacturing process.

Description

Technical Field

[0001] This application relates to the technical field of metal hand mold manufacturing, and in particular to a method for manufacturing the palm part of an energy-saving, chlorine-resistant duplex steel hand mold. Background Technology

[0002] Currently, ultra-thin and ultra-strong materials are the development requirements of the polymer film-forming products industry, such as latex, silicone, PVC, and nitrile. Increasing output, reducing energy consumption, and reducing costs are important factors for enterprises to create a good living space and development environment.

[0003] Currently, stainless steel products are characterized by stable dimensional accuracy, good thermal conductivity, corrosion resistance, and the ability to be produced in various thicknesses. These characteristics perfectly suit the requirements of manufacturing products made from latex, silicone, PVC, and nitrile. Furthermore, stainless steel offers advantages such as large-scale production, low processing costs, high production efficiency, lightweight, high rigidity, high thermal conductivity, corrosion resistance, high-temperature resistance, and oxidation resistance. Therefore, stainless steel hand molds are increasingly being used in glove production.

[0004] 2507 stainless steel is a duplex stainless steel with excellent corrosion resistance and high strength, allowing it to operate in highly corrosive and high-pressure environments. Its duplex structure gives it good plasticity and toughness, preventing cracking and deformation during cooling. Furthermore, it possesses good heat resistance and wear resistance, making it ideal for applications in high-temperature, high-pressure, and abrasive environments. The superior mechanical properties and corrosion resistance of duplex steel perfectly match the production needs of glove manufacturers.

[0005] The stainless steel metal hand mold is divided into a palm part, a wrist part, and a base part. The wrist part is the middle part that connects the palm part and the base part. The wrist part is connected to the palm part by welding, and the base part is connected to the wrist part by welding.

[0006] Regarding the aforementioned technologies, duplex stainless steel has a significantly lower ductility compared to 304 and 316 stainless steel. While 304 and 316 stainless steel have a ductility of 40%-50%, duplex stainless steel has a ductility of only 25%. The inventors discovered that during the fabrication of the palm, the large deformation at the joints between the fingers and between the fingers and the palm, specifically at the finger gaps, easily leads to tensile cracking during molding. Therefore, improvements are needed. Summary of the Invention

[0007] To address the problem of stretching and cracking during the fabrication of the palm part, this application provides a method for fabricating the palm part of an energy-saving, chlorine-resistant duplex stainless steel hand mold.

[0008] This application provides a method for manufacturing the palm portion of an energy-saving, chlorine-resistant, duplex stainless steel hand mold, employing the following technical solution:

[0009] A method for manufacturing the palm part of an energy-saving, chlorine-resistant, duplex stainless steel hand mold includes the following steps:

[0010] Step S100: Reverse stretching is performed on the metal sheet, and a reverse convex bulge is stretched out at the middle finger position of the pre-formed palm part of the metal sheet to form a pre-formed sheet.

[0011] Step S200: The preformed sheet is stretched and formed in the forward direction to obtain the blank left half or blank right half of the palm.

[0012] Step S300: Cut the left and right halves of the blank along the contour to obtain the left and right halves of the blank.

[0013] Step S400: Weld the left and right halves of the palm together to form the palm part.

[0014] Preferably, in step S100, the reverse convex hull is only set at the middle finger position of the pre-formed palm part of the metal sheet.

[0015] Preferably, the arc radius R of the reverse convex hull edge is greater than 15mm, the height of the reverse convex hull is 1 / 6 to 1 / 4 of the height of the palm, and the circumference of the reverse convex hull is greater than 1 / 2 of the circumference of the palm contour.

[0016] Preferably, the following step is further included between step S100 and step S200:

[0017] Step S110: Heat the preformed sheet at a heating rate of 50-200℃ / s to 750-900℃ and hold for 10-40s.

[0018] In step S120, the preformed sheet is protected by an inert gas during the heating process.

[0019] Preferably, step S200 includes the following steps:

[0020] Step S210: Place the preformed sheet in the molding die;

[0021] Step S220: The two middle finger gaps and the two side finger gaps of the pre-formed palm part in the pre-formed material sheet are forward stretched and formed in sequence using a forming mold.

[0022] Step S230: After the preformed sheet is forward stretched and formed, a blank left half or a blank right half of the palm is obtained.

[0023] Preferably, the molding die includes an upper die and a lower die that cooperates with the upper die;

[0024] The upper mold includes an upper mold base, an upper mold pad, an upper mold template, and an upper mold pressure plate arranged sequentially. The lower surface of the upper mold template is provided with an upper mold cavity. The upper mold pressure plate surrounds the upper mold template. An upper mold pressure spring connected to the upper mold pressure plate is provided in the upper mold pad. Two finger heel forming parts are provided in the upper mold template. The two finger heel forming parts extend into the upper mold cavity and are located at the middle two finger gap positions.

[0025] The lower mold includes a lower mold base, a lower mold template, and a lower mold pressure plate arranged sequentially. The upper surface of the lower mold template is provided with a lower mold cavity, which cooperates with the upper mold cavity. The lower mold pressure plate is arranged around the lower mold template and is opposite to the upper mold pressure plate. The lower mold base is provided with a drive unit for driving the lower mold pressure plate to rise and fall.

[0026] Preferably, the finger heel forming part includes a finger heel mounting groove disposed in the upper template and a finger heel forming block disposed in the finger heel mounting groove. The finger heel mounting groove communicates with the upper mold cavity, the finger heel forming block extends into the upper mold cavity, and a finger heel nitrogen spring connected to the finger heel forming block is disposed in the upper mold pad.

[0027] Preferably, the lower surface of the finger heel molding block has a V-shaped molding end, and the lower surface of the finger heel molding block forms a first molding surface and a second molding surface on both sides of the V-shaped molding end. The V-shaped molding end of the finger heel molding block is used to mold the root of the finger gaps in the palm.

[0028] When the heel molding block is not under pressure, the upper surface of the heel molding block is horizontal. After the heel molding block is pressed into the heel mounting groove, the second molding surface is horizontal.

[0029] Preferably, a finger heel limiting block is provided in the finger heel mounting groove, and the lower surface of the finger heel limiting block has a limiting inclined surface, which is used to abut against the upper surface of the finger heel forming block when the finger heel forming block is pressed into the finger heel mounting groove.

[0030] Preferably, the driving unit includes a fixed plate disposed on the lower mold base and a push rod slidably mounted on the fixed plate. The push rod is connected to the lower mold pressure plate, and a driving hydraulic cylinder is disposed on the fixed plate.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] This application employs hot-stretching to form duplex steel sheets with excellent corrosion resistance. By reverse stretching of the metal sheet, controlling the heating temperature of the metal sheet, and controlling the step-by-step forming of the forming mold, the cracking at the finger joints during the forming process is solved, achieving a material thinning rate of less than 25% at the finger joints and a tensile springback of less than 5% for the metal sheet, thereby effectively improving production efficiency. Attached Figure Description

[0033] Figure 1 This is a flowchart illustrating the process of creating a hand mold's palm.

[0034] Figure 2 This is a schematic diagram of the reverse convex hull structure.

[0035] Figure 3 This is a schematic diagram of the state of a reverse convex hull after being stretched in the forward direction.

[0036] Figure 4 This is a schematic diagram of the first structure of the molding die.

[0037] Figure 5 This is a schematic diagram of the second structure of the molding die.

[0038] Figure 6 This refers to a schematic diagram showing the stretching position of the molding block.

[0039] Figure 7 This is a schematic diagram of the first stretched state of the forming mold.

[0040] Figure 8 This is a schematic diagram of the second stretching state of the forming mold.

[0041] Figure 9 This is a schematic diagram of the third stretching state of the forming mold.

[0042] Figure 10 This is a schematic diagram of the fourth stretching state of the forming mold.

[0043] Explanation of reference numerals in the attached drawings: 1. Metal sheet; 2. Reverse convex bulge; 3. Upper mold; 31. Upper mold base; 32. Upper mold pad; 33. Upper template; 34. Upper mold pressure plate; 35. Upper mold pressure spring; 36. Upper mold cavity; 37. Finger heel forming part; 371. Finger heel mounting groove; 372. Finger heel forming block; 373. Finger heel nitrogen spring; 374. Suspension end; 375. Suspension shoulder; 376. V-shaped forming end; 377. First forming surface; 378. Second forming surface; 38. Finger heel limiting block; 39. Limiting slope; 4. Lower mold; 41. Lower mold base; 42. Lower template; 43. Lower mold pressure plate; 44. Lower mold cavity; 45. Drive part; 451. Fixing plate; 452. Ejector rod. Detailed Implementation

[0044] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0045] A method for manufacturing the palm part of an energy-saving, chlorine-resistant duplex stainless steel hand mold, referring to... Figure 1 As shown, the process includes the following steps: Step S100, reverse stretching is performed on the metal sheet 1, and a reverse convex 2 is stretched out at the middle finger position of the pre-formed palm part of the metal sheet 1 to form a pre-formed sheet.

[0046] According to the technical solution defined in step S100, specifically, the metal sheet 1 is made of duplex stainless steel, which can also be called duplex steel. The metal sheet 1 is cut into square pieces, and the position of the palm is pre-formed on the metal sheet 1. That is, the position of the palm is pre-planned on the metal sheet 1. It can be the left half of the palm or the right half of the palm. This embodiment does not make a specific limitation.

[0047] The palm has four finger gaps, which are defined in this embodiment as the two middle finger gaps and the two side finger gaps. Based on the material flow during the stretching of the metal sheet 1, the two middle finger gaps are constrained during stretching due to the forming of the two side finger gaps. As can be seen from the material flow texture, the amount of material flowing in the two middle finger gaps is significantly less than that in the two side finger gaps. The forming of the two middle finger gaps is more about the material's own extension. Therefore, when the deformation exceeds the material's elongation limit, cracking will be exacerbated. In contrast, during the forming of the two side finger gaps, the material compensates for the cracking by flowing material from the sides.

[0048] Reference Figure 2 and Figure 3 As shown, when performing forward stretching on the metal sheet 1, it is necessary to first perform reverse stretching on the metal sheet 1. A reverse protrusion 2 is stretched in the reverse direction at the middle finger position of the pre-formed palm portion of the metal sheet 1 to form a pre-formed sheet. In this embodiment, the reverse protrusion 2 is only set at the middle finger position of the pre-formed palm portion of the metal sheet 1, because the middle finger position of the palm portion corresponds precisely to the space between the two middle fingers.

[0049] During reverse stretching, the shape, structure, and size of the reverse convex hull 2 ​​will be controlled. In one embodiment, the arc radius R of the edge of the reverse convex hull 2 ​​is greater than 15 mm, the height H of the reverse convex hull 2 ​​is 1 / 6 to 1 / 4 of the height of the palm, and the circumference L of the reverse convex hull 2 ​​is greater than 1 / 2 of the circumference of the palm contour.

[0050] Therefore, by forming a reverse convex hull 2, a portion of the preformed sheet material is used as a material compensation for the finger gap position during the next step of rapid stretching, thereby slowing down the rapid thinning of the material in that part, thus satisfying the requirement that the material thinning is less than 25% of the thickness of the metal sheet 1, and solving the hardening and cracking caused by material stretching.

[0051] The following steps are included after step S100:

[0052] Step S110: Heat the preformed sheet at a heating rate of 50-200℃ / s to 750-900℃ and hold for 10-40s.

[0053] In step S120, the preformed sheet is protected by an inert gas during the heating process.

[0054] Specifically, in this embodiment, the preformed sheet is heated at a warm forming temperature, such as by using a medium-frequency induction coil or a tunnel furnace. In order to prevent the preformed sheet from being over-oxidized during the heating process, it will be protected by an inert gas. In this embodiment, nitrogen is used as the inert gas.

[0055] Step S200: The preformed sheet is forward stretched to obtain the blank left half or blank right half of the palm.

[0056] According to the technical solution defined in step S200, specifically, the preformed sheet is forward stretched and formed by a forming mold. The forming mold is fixed on a 200-ton hydraulic press. Before the forming mold is forward stretched and formed, it needs to be heated to maintain the temperature at 400-500℃. The forming mold can be continuously or intermittently heated by a flame gun, or it can be heated by a heating tube inside the forming mold. This embodiment does not make specific limitations.

[0057] In step S200, the preformed sheet is forward stretched to obtain the blank left half or blank right half of the palm, including the following steps:

[0058] Step S210: Place the preformed sheet in the molding die;

[0059] Step S220: The two middle finger gaps and the two side finger gaps of the pre-formed palm part in the pre-formed material sheet are forward stretched and formed in sequence using a forming mold.

[0060] Step S230: After the preformed sheet is forward stretched and formed, a blank left half or a blank right half of the palm is obtained.

[0061] According to the technical solution defined in steps S210 to S230, specifically, before stretching and forming the molding die, the molding die needs to be lubricated, and then the heated preformed sheet is quickly placed into the molding die, and then the molding die stretches and forms the preformed sheet, with a forming time of 10-30 seconds.

[0062] To better shape the finger seams, this application adopts a sequential shaping process, with the two middle finger seams and the two side finger seams being shaped first. The two middle finger seams are shaped first to fully utilize the pre-formed material output for material compensation in the middle finger seams. At the same time, since the two side finger seams have not yet been shaped, the resistance to the inward flow of material on both sides is reduced, ensuring that the material flows fully to the two middle finger seams. This overcomes the risk of material thinning and cracking that occurs when all finger seams are shaped simultaneously, where the material in the middle two finger seams relies solely on its own material extension due to the lack of material flow compensation.

[0063] Reference Figure 4 and Figure 5 As shown, the molding die includes an upper die 3 and a lower die 4 that cooperates with the upper die 3.

[0064] The upper mold 3 includes an upper mold base 31, an upper mold pad 32, an upper template 33, and an upper mold pressure plate 34 arranged sequentially. The upper mold pressure plate 34 is disposed on the lower surface of the upper template 33 and surrounds the upper template 33. An upper mold pressure spring 35 is disposed in the upper mold pad 32. One end of the upper mold pressure spring 35 is fixed on the upper mold pad 32, and the other end of the upper mold pressure spring 35 passes through the upper template 33 and is connected to the upper mold pressure plate 34.

[0065] Reference Figure 5 , Figure 6 and Figure 7 As shown, the lower surface of the upper template 33 is provided with an upper mold cavity 36. The shape of the upper mold cavity 36 is the outline shape of a palm for forward stretching and forming of the preformed sheet. The two middle finger gaps in the upper mold cavity 36 are empty. The upper template 33 is provided with two finger heel forming parts 37. The two finger heel forming parts 37 extend into the upper mold cavity 36 and are located at the two middle finger gaps. The two finger heel forming parts 37 are used to form the two middle finger gaps.

[0066] The heel forming part 37 includes a heel mounting groove 371 disposed in the upper mold plate 33 and a heel forming block 372 disposed in the heel mounting groove 371. The heel mounting groove 371 communicates with the upper mold cavity 36. The heel forming block 372 extends into the upper mold cavity 36. A heel nitrogen spring 373 connected to the heel forming block 372 is disposed in the upper mold pad 32. One end of the heel nitrogen spring 373 is connected to the upper mold pad 32, and the other end of the heel nitrogen spring 373 abuts against the upper surface of the heel forming block 372.

[0067] The heel molding block 372 has suspension ends 374 on both sides. The two sides of the heel mounting groove 371 are provided with suspension shoulders 375 for cooperating with the suspension ends 374. In the natural state (i.e., the heel molding block 372 is not under pressure), the heel molding block 372 is engaged with the suspension shoulders 375 through the suspension ends 374, so that the lower surface of the heel molding block 372 extends into the upper mold cavity 36, and the upper surface of the heel molding block 372 is horizontal.

[0068] The lower surface of the heel molding block 372 has a V-shaped molding end 376. The lower surface of the heel molding block 372 forms a first molding surface 377 and a second molding surface 378 on both sides of the V-shaped molding end 376. The V-shaped molding end 376 of the heel molding block 372 is used to mold the base of the finger gaps in the palm.

[0069] The finger heel mounting groove 371 includes a finger heel limiting block 38. The lower surface of the finger heel limiting block 38 has a limiting inclined surface 39. This limiting inclined surface 39 abuts against the upper surface of the finger heel forming block 372 when it is pressed into the finger heel mounting groove 371. After the finger heel forming block 372 is pressed into the finger heel mounting groove 371, its upper surface is inclined, and the second forming surface 378 is horizontal. It is worth noting that, to achieve this change in state, the right side wall of the finger heel forming block 372 is inclined, and the upper surface of the suspension shoulder 375 on the right side of the finger heel mounting groove 371 is also inclined, with the inclination direction being the same as that of the limiting inclined surface 39.

[0070] It is worth noting that when the heel forming block 372 is not under pressure, the lower surface of the upper mold pressure plate 34 is lower than the lowest point of the lower surface of the heel forming block 372, the lowest point of the lower surface of the heel forming block 372 is lower than the lower surface of the upper template 33, and the lower surface of the heel forming block 372 is lower than the two finger gaps on both sides of the upper mold cavity 36. Therefore, when the upper mold 3 is pressed down as a whole, the upper mold pressure plate 34, the heel forming block 372, and the upper template 33 come into contact with the preformed sheet in the following order.

[0071] The lower mold 4 includes a lower mold base 41, a lower template 42 and a lower mold pressure plate 43 arranged in sequence. The upper surface of the lower template 42 is provided with a lower mold cavity 44, which cooperates with the upper mold cavity 36. After the upper mold cavity 36 and the lower mold cavity 44 are closed, they are used to stretch the preformed material sheet into a blank left half or a blank right half of the palm.

[0072] The lower die pressure plate 43 is arranged around the lower die plate 42 and opposite to the upper die pressure plate 34. The lower die base 41 is provided with a drive unit 45 for driving the lower die pressure plate 43 to rise and fall. In one embodiment, the drive unit 45 includes a fixed plate 451 provided on the lower die base 41 and a push rod 452 slidably mounted on the fixed plate 451. The push rod 452 is connected to the lower die pressure plate 43, and a drive hydraulic cylinder is provided on the fixed plate 451.

[0073] The upper surface of the lower die pressing plate 43 is higher than the upper surface of the lower template 42, and the lower die pressing plate 43 will contact the upper die pressing plate 34 before the lower template 42.

[0074] It is worth noting that the demolding force of the lower die pressure plate 43 is greater than the spring force of the nitrogen spring 373, which is greater than the pressing force of the upper die pressure plate 34.

[0075] The following describes the stretching and forming of the preformed sheet by the upper mold 3 and the lower mold 4.

[0076] Reference Figure 7 As shown, the preformed sheet is first placed on the lower die pressure plate 43. At this time, the upper die 3 moves downward as a whole, and the upper die pressure plate 34 contacts and presses against the preformed sheet to press the preformed sheet tightly with the lower die pressure plate 43. Among them, the demolding force of the lower die pressure plate 43 is greater than the pressing force of the upper die pressure plate 34. The upper die 3 continues to move downward, and the upper die pressure plate 34 stops moving downward. The finger forming block 372 contacts the preformed sheet first. The upper die 3 and the finger forming block 372 continue to move downward, and the upper die pressure plate 34 stops moving downward due to the action of the lower die pressure plate 43.

[0077] Reference Figure 8 As shown, the heel forming block 372 moves downwards to stretch the two middle finger gaps. Because the preformed sheet is compressed, the material will flow towards the two middle finger gaps when the heel forming block 372 is forming. Specifically, the heel forming block 372 first stretches and shapes the base of the two middle finger gaps because the material deformation is greatest at the base of the two middle finger gaps, so more material needs to flow to this position.

[0078] Reference Figure 9 As shown, after the heel forming block 372 is formed to a certain depth, the upper mold pressing plate 34 and the upper template 33 are attached together, and the upper template 33 will abut against the pre-formed material sheet. Subsequently, the upper template 33, the heel forming block 372, and the upper mold pressing plate 34 will press the lower mold pressing plate 43 to move downward.

[0079] As the upper template 33, the finger forming block 372, and the upper mold pressure plate 34 move downward together, the upper template 33 comes into contact with the lower template 42, the upper mold cavity 36 and the lower mold cavity 44 begin to assemble, and the preformed sheet begins to be stretched and formed as a whole. The two finger seams on both sides begin to be stretched and formed at this stage.

[0080] Reference Figure 10 As shown, when the lowest point of the finger-shaped block 372 contacts the bottom surface of the lower mold cavity 44, the finger-shaped block 372 receives a reaction force and stops moving. At this time, as the upper mold 3 continues to move downward, the finger-shaped nitrogen spring 373 is compressed and contracts. At the same time, the force on the left side of the finger-shaped block 372 becomes unbalanced, and it rotates to the right.

[0081] Finally, the lower surface of the heel forming block 372 rotates from a V-shape to a straight line. The right side of the heel forming block 372 is joined to the lower surface of the upper mold 3 on a plane. When the upper mold 3 and the lower mold 4 are completely closed, the heel forming block 372 is restricted by the heel limiting block 38 and together with the upper mold 3, it applies pressure to the preformed sheet, ultimately achieving the stretching and forming of the preformed sheet.

[0082] At this point, the preformed sheet is stretched and shaped to obtain the blank left half or blank right half of the palm.

[0083] Step S300: Cut the left and right halves of the blank along the contour to obtain the left and right halves of the blank.

[0084] According to the technical solution defined in step S300, specifically, cutting the left and right halves of the blank along the contour mainly involves removing the excess edge material on the left and right halves of the blank, so that only the left and right halves that conform to the size specifications remain on the left and right halves of the blank.

[0085] Step S400: Weld the left and right halves of the palm together to form the palm part.

[0086] According to the technical solution defined in step S400, specifically, after the left and right half palms are joined together, the left and right half palms are placed into a welding mold, and the welding mold is used to fasten and position the left and right half palms. Then, spot welding is performed to fix them, and then full welding is performed to fix them.

[0087] This completes the production of the metal sheet 1 into the palm part.

[0088] 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 method for manufacturing the palm portion of an energy-saving, chlorine-resistant, duplex stainless steel hand mold, characterized in that, Includes the following steps: Step S100: Reverse stretching is performed on the metal sheet (1), and a reverse convex bulge (2) is stretched out at the middle finger position of the pre-formed palm part of the metal sheet (1) to form a pre-formed sheet. Step S200: The preformed sheet is stretched and formed in the forward direction to obtain the blank left half or blank right half of the palm. Step S300: Cut the left and right halves of the blank along the contour to obtain the left and right halves of the blank. Step S400: Weld the left and right halves of the palm together to form the palm part; Step S200 includes the following steps: Step S210: Place the preformed sheet into the molding die; Step S220: The two middle finger gaps and the two side finger gaps of the pre-formed palm part in the pre-formed material sheet are forward stretched and formed in sequence using a forming mold. Step S230: After the preformed sheet is forward stretched and formed, a blank left half or a blank right half of the palm is obtained. The molding die includes an upper die (3) and a lower die (4) that cooperates with the upper die (3); The upper mold (3) includes an upper mold base (31), an upper mold pad (32), an upper mold template (33), and an upper mold pressure plate (34) arranged in sequence. The lower surface of the upper mold template (33) is provided with an upper mold cavity (36). The upper mold pressure plate (34) surrounds the upper mold template (33). The upper mold pad (32) is provided with an upper mold pressure spring (35) connected to the upper mold pressure plate (34). The upper mold template (33) is provided with two finger heel forming parts (37). The two finger heel forming parts (37) extend into the upper mold cavity (36) and are located at the middle two finger gap positions. The lower mold (4) includes a lower mold base (41), a lower template (42), and a lower mold pressure plate (43) arranged in sequence. The upper surface of the lower template (42) is provided with a lower mold cavity (44), which cooperates with the upper mold cavity (36). The lower mold pressure plate (43) is arranged around the lower template (42) and is opposite to the upper mold pressure plate (34). The lower mold base (41) is provided with a driving part (45) for driving the lower mold pressure plate (43) to rise and fall. The finger heel forming part (37) includes a finger heel mounting groove (371) disposed in the upper template (33) and a finger heel forming block (372) disposed in the finger heel mounting groove (371). The finger heel mounting groove (371) communicates with the upper mold cavity (36). The finger heel forming block (372) extends into the upper mold cavity (36). A finger heel nitrogen spring (373) connected to the finger heel forming block (372) is disposed in the upper mold pad (32).

2. The method for manufacturing the palm part of an energy-saving, chlorine-resistant, duplex stainless steel hand mold according to claim 1, characterized in that, In step S100, the reverse convex hull (2) is only set at the middle finger position of the pre-formed palm part of the metal sheet (1).

3. The method for manufacturing the palm part of an energy-saving, chlorine-resistant, duplex stainless steel hand mold according to claim 1, characterized in that, The arc radius R of the edge of the reverse convex hull (2) is greater than 15mm. The height of the reverse convex hull (2) is 1 / 6 to 1 / 4 of the height of the palm. The circumference of the reverse convex hull (2) is greater than 1 / 2 of the circumference of the palm contour.

4. The method for manufacturing the palm part of an energy-saving, chlorine-resistant, duplex stainless steel hand mold according to claim 1, characterized in that, The following steps are also included between step S100 and step S200: Step S110: Heat the preformed sheet at a heating rate of 50-200℃ / s to 750-900℃ and hold for 10-40s. In step S120, the preformed sheet is protected by an inert gas during the heating process.

5. The method for manufacturing the palm part of an energy-saving, chlorine-resistant, duplex stainless steel hand mold according to claim 1, characterized in that, The lower surface of the finger heel forming block (372) has a V-shaped forming end (376). The lower surface of the finger heel forming block (372) forms a first forming surface (377) and a second forming surface (378) on both sides of the V-shaped forming end (376). The V-shaped forming end (376) of the finger heel forming block (372) is used to form the base of the finger gaps in the palm. When the heel molding block (372) is not under pressure, the upper surface of the heel molding block (372) is horizontal. After the heel molding block (372) is pressed into the heel mounting groove (371), the second molding surface (378) is horizontal.

6. The method for manufacturing the palm part of an energy-saving, chlorine-resistant, duplex stainless steel hand mold according to claim 1, characterized in that, A finger heel mounting groove (371) is provided with a finger heel limiting block (38), and the lower surface of the finger heel limiting block (38) has a limiting inclined surface (39). The limiting inclined surface (39) is used to abut against the upper surface of the finger heel forming block (372) when the finger heel forming block (372) is pressed into the finger heel mounting groove (371).

7. The method for manufacturing the palm part of an energy-saving, chlorine-resistant, duplex stainless steel hand mold according to claim 1, characterized in that, The drive unit (45) includes a fixed plate (451) disposed on the lower mold base (41) and a push rod (452) slidably mounted on the fixed plate (451). The push rod (452) is connected to the lower mold pressing plate (43). A drive hydraulic cylinder is disposed on the fixed plate (451).

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