High-pressure liquid forming die

Abstract

The utility model relates to a high-pressure liquid forming die. The high-pressure liquid forming die comprises an upper die and a lower die, the upper mold comprises an upper mold base, an upper mold base plate and an upper mold plate which are sequentially arranged, an upper mold cavity is formed in the upper mold plate, two finger seam forming blocks are arranged in the upper mold plate, and the two finger seam forming blocks extend into the upper mold cavity and are located at the forming positions of two finger seams in the middle; the lower die comprises a lower die base, a lower die plate and a lower die pressing plate, the lower die plate is arranged on the lower die base, the lower die pressing plate is arranged outside the lower die plate in a surrounding mode, and the lower die pressing plate is used for bearing a metal plate and is matched with the upper die plate in an abutting mode. A lower mold core matched with the upper mold cavity is arranged on the lower mold plate; a liquid injection runner is arranged in the upper mold plate, one end of the liquid injection runner is communicated with the upper mold cavity, and the other end of the liquid injection runner is communicated with the outside. The method has the effect of reducing the tensile cracking condition.

Description

Technical Field

[0001] The present application relates to the technical field of molds, and in particular to a high-pressure liquid molding mold. Background Art

[0002] At present, stainless steel products have stable dimensional accuracy, good thermal conductivity, corrosion resistance, and the plates can be made in various thicknesses. These characteristics just meet the production requirements of latex, silicone, PVC, nitrile and other products. That is, large-scale production, low processing cost, high production efficiency, lightness, high rigidity and high thermal conductivity, corrosion resistance, high temperature resistance and oxidation resistance, so stainless steel metal hand molds are gradually used in glove production.

[0003] The stainless steel metal hand mold is divided into a palm portion, a wrist portion and a base portion. The wrist portion is the middle portion connecting the palm portion and the base portion. The wrist portion and the palm portion are connected by welding, and the base portion and the wrist portion are connected by welding.

[0004] With respect to the above-mentioned related technologies, the inventors found that when manufacturing the palm, due to the large deformation at the connection between the fingers and between the fingers and the palm, that is, the finger seams of the palm, it is easy for stretching and cracking to occur in this area during molding. Utility Model Content

[0005] In order to reduce the occurrence of tensile cracking, the present application provides a high-pressure liquid forming mold.

[0006] The high-pressure liquid forming mold provided in this application adopts the following technical solution:

[0007] A high-pressure liquid forming mold, comprising an upper mold and a lower mold;

[0008] The upper mold comprises an upper mold base, an upper mold pad and an upper mold plate which are arranged in sequence, an upper mold cavity is arranged in the upper mold plate, two finger gap forming blocks are arranged in the upper mold plate, and the two finger gap forming blocks extend into the upper mold cavity and are located at the forming positions of the two middle finger gaps;

[0009] The lower mold comprises a lower mold base, a lower mold plate and a lower mold pressing plate, wherein the lower mold plate is arranged on the lower mold base, the lower mold pressing plate is arranged around the lower mold plate, the lower mold pressing plate is used to receive the metal sheet and abut against the upper mold plate, and the lower mold plate is provided with a lower mold core for cooperating with the upper mold cavity;

[0010] The upper mold plate is provided with a liquid injection channel, one end of which is communicated with the upper mold cavity, and the other end of which is communicated with the outside.

[0011] Preferably, the lower surface of the finger gap forming block is flush with the lower surface of the upper template.

[0012] Preferably, the lower die base is provided with a driving part for driving the lower die pressing plate to rise and fall.

[0013] Preferably, the driving part includes a fixed seat arranged on the lower die seat, and a push rod slidably mounted on the fixed seat, the push rod is connected to the lower die pressing plate, and a driving hydraulic cylinder connected to the push rod is arranged on the fixed seat.

[0014] Preferably, the lower die pressing plate is provided with enclosing ribs around its periphery, and the enclosing ribs form receiving grooves for accommodating the metal sheet.

[0015] Preferably, at least one return opening is provided on the enclosing rib at intervals along the circumferential direction.

[0016] In summary, the present application includes at least one of the following beneficial technical effects:

[0017] The present application forms two middle finger gaps by stretching first and then forming two finger gaps on both sides, so that the flow of metal sheet to the two middle finger gaps is not hindered, so that the flow of metal sheet is more sufficient, and the metal sheet first compensates for the material flow of the two middle finger gaps, thereby effectively reducing the occurrence of stretching cracking at the two middle finger gaps. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a high-pressure liquid forming mold.

[0019] Figure 2 It is a schematic diagram of the first stretching molding of a high-pressure liquid molding mold.

[0020] Figure 3 It is a schematic diagram of the second stretching molding of the high-pressure liquid molding die.

[0021] Figure 4 It is a schematic diagram of the third stretching molding of the high-pressure liquid molding die.

[0022] Figure 5 It is a schematic diagram of the structure of liquid filling and stretching in a high-pressure liquid forming mold.

[0023] Figure 6 It is a schematic diagram of the installation of the plate clamping assembly.

[0024] Figure 7 It is a structural schematic diagram of the plate pressing assembly.

[0025] Explanation of the reference numerals: 1. upper mold; 11. upper mold base; 12. upper mold pad; 13. upper mold plate; 14. upper model cavity; 15. finger gap forming block; 16. injection channel; 2. lower mold; 21. lower mold base; 22. lower mold plate; 23. lower mold pressing plate; 24. driving unit; 241. fixed seat; 242. ejector rod; 25. enclosing rib; 26. liquid chamber; 27. reflux port; 28. quick connector; 29. ​​reflux pipe; 30. plate clamping assembly; 301. clamping rod; 302. reflux hole; 303. guide slope; 304. elastic spring. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-7 This application is described in further detail.

[0027] A high-pressure liquid forming mold is used to stretch a metal sheet into a palm. The metal sheet is cut into a square sheet of preset length and width. The position of the palm is preformed on the metal sheet, that is, the position of the formed palm is planned in advance on the metal sheet. The metal sheet is stretched into a blank palm by the high-pressure liquid forming mold, and then the blank palm is trimmed along the contour to obtain a left half palm or a right half palm, and the left half palm and the right half palm are welded together to form the palm.

[0028] Among them, the palm has four finger gaps, which are defined as the two middle finger gaps and the two finger gaps on the sides in this embodiment. Based on the material flow during the stretching of the metal sheet, the two middle finger gaps are constrained by the forming of the two finger gaps on the sides during the forming stretching. From the material flow texture, it can be seen that the material flow in the two middle finger gaps is significantly less than that in the two finger gaps on the sides. The forming of the two middle finger gaps is more about the extension of the material itself. Therefore, when the deformation exceeds the extension limit of the material, the occurrence of cracking will be aggravated. When the two finger gaps on the sides are formed, the material will compensate the material from the side to the finger gap, and the cracking will be alleviated.

[0029] Therefore, the present application uses a high-pressure liquid forming mold to first stretch and form the two middle finger gaps and then form the two finger gaps on both sides, so that the flow of the metal sheet to the two middle finger gaps is not hindered, so that the flow of the metal sheet is more sufficient, and the metal sheet first compensates for the material flow of the two middle finger gaps, thereby effectively reducing the occurrence of stretching cracking at the two middle finger gaps.

[0030] Specifically, the high-pressure liquid forming mold includes an upper mold 1 and a lower mold 2. The upper mold 1 can be driven by a hydraulic press to move toward the lower mold 2.

[0031] Reference Figure 1As shown, the upper mold 1 includes an upper mold base 11, an upper mold pad 12 and an upper mold plate 13 which are arranged in sequence. The upper mold pad 12 is fixed on the upper mold base 11, and the upper mold plate 13 is fixed on the upper mold pad 12. An upper model cavity 14 is arranged in the upper mold plate 13. The inner wall of the upper model cavity 14 is a smooth curved surface. The upper model cavity 14 is only provided with empty notches at the positions of the two middle finger gaps. The upper model cavity 14 does not have forming punches for the two finger gaps on both sides. Two finger gap forming blocks 15 are arranged in the upper mold plate 13. The two finger gap forming blocks 15 extend into the upper model cavity 14 and are located at the forming positions of the two middle finger gaps. The lower surfaces of the finger gap forming blocks 15 are flush with the lower surface of the upper mold plate 13.

[0032] The upper mold plate 13 is provided with a liquid injection channel 16, one end of which is communicated with the upper mold cavity 14, and the other end of which is communicated with the outside, through which liquid can be injected into the upper mold cavity 14, and after the upper mold 1 and the lower mold 2 are closed, the liquid forms a high pressure state in the upper mold cavity 14. In one embodiment, the liquid can be water or hydraulic oil.

[0033] The lower mold 2 includes a lower mold base 21, a lower mold plate 22 and a lower mold pressing plate 23. The lower mold plate 22 is arranged on the lower mold base 21. The lower mold pressing plate 23 is arranged around the lower mold plate 22, that is, the middle part of the lower mold pressing plate 23 is hollowed out. The inner wall surface of the lower mold pressing plate 23 is in contact with and fits with the outer wall surface of the lower mold plate 22. The lower mold base 21 is provided with a driving part 24 for driving the lower mold pressing plate 23 to rise and fall. When the upper mold 1 and the lower mold 2 are not in the mold-clamping state, the surface of the lower mold pressing plate 23 is higher than the surface of the lower mold plate 22. The lower mold pressing plate 23 is surrounded by an enclosing rib 25, and the enclosing rib 25 forms a receiving groove for accommodating a metal sheet. The lower mold pressing plate 23 is used to receive the metal sheet and abut against the upper mold plate 13. It is worth noting that after the upper mold plate 13 contacts the lower mold pressing plate 23, the inner wall of the enclosing rib 25 will fit on the outer wall surface of the upper mold plate 13.

[0034] The lower template 22 is provided with a lower model core for cooperating with the upper model cavity 14. The lower model core is provided with two finger gaps in the middle of the palm and two finger gaps on both sides. The two finger gap forming blocks 15 in the upper model cavity 14 can cooperate with the two middle finger gaps in the lower model core.

[0035] In one embodiment, the driving part 24 includes a fixed seat 241 arranged on the lower mold seat 21, and a push rod 242 slidably installed on the fixed seat 241, the push rod 242 is connected to the lower mold pressing plate 23, and a driving hydraulic cylinder connected to the push rod 242 is arranged on the fixed seat 241.

[0036] The following is a description of the first stretching and second stretching of the high-pressure liquid molding die.

[0037] After the metal sheet is placed on the lower die pressing plate 23 , the upper die 1 is clamped toward the lower die 2 .

[0038] Reference Figure 2 As shown, the upper mold plate 13 abuts against the lower mold pressing plate 23 and presses the metal sheet. As the upper mold 1 continues to descend, the lower mold pressing plate 23 is pressed downward, and the metal sheet is stretched under the action of the upper mold cavity 14, the finger gap forming block 15 and the lower mold core. The finger gap forming block 15 stretches and forms the two middle finger gaps of the metal sheet.

[0039] Reference Figure 3 and Figure 4 As shown, as the upper mold 1 moves downward, the upper mold 1 and the lower mold 2 are finally closed, and the two middle finger gaps of the metal sheet are also stretched into place. The metal sheet is formed into the palm of the initial blank after the first stretching. At this time, the upper mold plate 13 presses the palm of the initial blank, so that a closed liquid chamber 26 is formed between the upper model cavity 14 and the palm of the initial blank.

[0040] Reference Figure 5 As shown, the second stretching molding is then carried out, and liquid is injected into the liquid chamber 26 through the injection channel 16. The liquid enters the liquid chamber 26. As the pressure of the liquid in the liquid chamber 26 continues to increase, the palm of the preliminary blank is further deformed under the force of the liquid. On the one hand, the two middle finger gaps are further stretched and formed to reach the designed size, and the two finger gaps on both sides are also stretched and formed into place under the action of the liquid pressure. At the same time, the surrounding material of the palm of the preliminary blank is further plastically deformed to fit on the lower template 22.

[0041] At this point, the second stretching forming is completed. After the liquid chamber 26 is kept under pressure for a period of time, the upper mold 1 and the lower mold 2 are demoulded, thereby obtaining a complete palm portion of the finger gap.

[0042] Reference Figure 6 and Figure 7 As shown, after the upper mold 1 and the lower mold 2 are demolded, the liquid in the liquid chamber 26 will be discharged. In the present application, at least one reflux port 27 is circumferentially spaced apart on the enclosing rib 25, and both ends of the reflux port 27 are respectively connected to the inner side and the outer side of the enclosing rib 25. The reflux port 27 is provided with a quick-connect joint 28 at one end on the outer side of the enclosing rib 25, and a reflux pipe 29 is installed on the quick-connect joint 28. The reflux pipe 29 is connected to a reflux collection box, wherein a reflux pump is installed on the reflux pipe 29, and the reflux pump is used to improve the liquid suction efficiency.

[0043] Therefore, when the upper template 13 is separated from the lower mold pressing plate 23, the upper template 13 will not press the palm of the blank, so that the liquid in the liquid chamber 26 will overflow to the surroundings and enter the enclosed retaining edge 25 for blocking. At this time, the overflowed liquid will enter the reflux port 27, and after being sucked by the reflux pump, the liquid will enter the reflux collection box through the reflux pipe 29, thereby completing the recovery and reuse of the liquid.

[0044] It is worth noting that a plate pressing assembly 30 is also provided in each return port 27 .

[0045] The plate clamping assembly 30 includes a clamping rod 301 slidably installed in the return port 27, and the end of the clamping rod 301 can extend into the inner side of the enclosing rib 25, but the clamping rod 301 will not slide out of the return port 27. A return hole 302 is provided in the clamping rod 301 along its axial direction, and a guide slope 303 for guiding the sliding of the clamping rod 301 is provided at the end of the clamping rod 301 facing the lower mold plate 22. When the extended end of the clamping rod 301 extends into the receiving groove, the upper edge of the guide slope 303 is flush with the inner wall surface of the enclosing rib 25, wherein a plate clamping groove is formed between the clamping rod 301 and the lower mold pressing plate 23.

[0046] An elastic spring 304 is provided in the reflux port 27 to provide a driving force for the clamping rod 301 toward the lower mold plate 22 . One end of the elastic spring 304 abuts against the end of the clamping rod 301 , and the other end of the elastic spring 304 abuts against the edge of the reflux port 27 .

[0047] Therefore, when the metal sheet is placed on the lower die pressing plate 23 , the end of the pressing rod 301 will press the side edge of the metal sheet to improve the forming stability of the metal sheet on the lower die pressing plate 23 .

[0048] When the upper mold 1 moves toward the side of the lower mold 2, the lower surface of the upper mold plate 13 will contact the guiding inclined surface 303 at the end of the pressing rod 301, thereby guiding the pressing rod 301 to slide and press the pressing rod 301 into the reflux port 27. After the stretching molding is completed, after the upper mold plate 13 is separated from the lower mold pressing plate 23, the pressing rod 301 will extend out of the reflux port 27, and the overflowed liquid will enter the reflux port 27 through the reflux hole 302 of the pressing rod 301, and then be discharged through the reflux pipe 29.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-pressure liquid forming mold, characterized in that: It comprises an upper mold (1) and a lower mold (2); The upper mold (1) comprises an upper mold base (11), an upper mold pad (12) and an upper mold plate (13) which are arranged in sequence, an upper mold cavity (14) is arranged in the upper mold plate (13), two finger gap forming blocks (15) are arranged in the upper mold plate (13), and the two finger gap forming blocks (15) extend into the upper mold cavity (14) and are located at the forming positions of the two middle finger gaps; The lower mold (2) comprises a lower mold base (21), a lower mold plate (22) and a lower mold pressing plate (23); the lower mold plate (22) is arranged on the lower mold base (21); the lower mold pressing plate (23) is arranged around the outside of the lower mold plate (22); the lower mold pressing plate (23) is used to receive the metal plate and abut against the upper mold plate (13); the lower mold plate (22) is provided with a lower mold core for cooperating with the upper mold cavity (14); The upper mold plate (13) is provided with a liquid injection channel (16), one end of the liquid injection channel (16) is in communication with the upper mold cavity (14), and the other end of the liquid injection channel (16) is in communication with the outside.

2. A high pressure liquid forming mold according to claim 1, characterized in that: The lower surface of the finger gap forming block (15) is flush with the lower surface of the upper template (13).

3. A high pressure liquid forming mold according to claim 1, characterized in that: The lower die base (21) is provided with a driving part (24) for driving the lower die pressing plate (23) to move up and down.

4. A high pressure liquid forming mold according to claim 3, characterized in that: The driving part (24) comprises a fixed seat (241) arranged on the lower die seat (21), and a push rod (242) slidably mounted on the fixed seat (241), the push rod (242) being connected to the lower die pressing plate (23), and a driving hydraulic cylinder connected to the push rod (242) being arranged on the fixed seat (241).

5. A high pressure liquid forming mold according to claim 1, characterized in that: The lower die pressing plate (23) is provided with enclosing ribs (25) around its periphery, and the enclosing ribs (25) form receiving grooves for accommodating metal plates.

6. A high pressure liquid forming mold according to claim 5, characterized in that: At least one return opening (27) is provided on the enclosing rib (25) at intervals along the circumferential direction.

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