One-step forming die for U-shaped multi-section arc bending plate of oil tank

Abstract

The present invention relates to a one-time forming die for a U-shaped multi-segment circular arc bent plate of an oil tank, comprising an upper pressing block and a lower pressing groove matched with the upper pressing block; the lower pressing groove comprises a lower mold central module in the middle and a left L-shaped module and a right L-shaped module respectively arranged on both sides of the lower mold central module, and the inner surfaces at the corners of the left L-shaped module and the right L-shaped module are arc surfaces; the left module limit baffle, the right module limit baffle and the plate limit baffle are fixed on a base; the left L-shaped module flipping area is between the left module limit baffle and the lower mold central module, and the right L-shaped module flipping area is between the right module limit baffle and the lower mold central module; the left L-shaped module and the right L-shaped module are flipped and arranged in the left L-shaped module flipping area and the right L-shaped module flipping area respectively; by using the forming die described in the present application, the U-shaped multi-segment circular arc bent plate is formed at one time, which greatly improves the processing efficiency.

Description

Technical Field

[0001] The invention relates to a one-step forming die for a U-shaped multi-segment circular arc bent plate of an oil tank. Background Art

[0002] At present, mailboxes of large-scale engineering machinery are made of multiple plates, including U-shaped multi-segment circular arc bending plates, which are composed of a bottom plate and two vertical plates connected at the end, and at least one vertical plate is bent inward. Since ordinary molds cannot complete such inward-bending plates, ordinary molds are generally used to bend the bottom plate and two vertical plates first, and then the second process is used to bend the inward again, which has low operating efficiency. The prior art urgently needs a mold that can form a U-shaped multi-segment circular arc bending plate in one step. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects in the prior art and provide a mold which can form a U-shaped multi-segment arc bent plate in one step.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is to provide a one-time forming die for a U-shaped multi-segment circular arc bending plate of an oil tank, comprising an upper pressing block and a lower pressing groove matched with the upper pressing block; the bottom of the lower pressing groove is arranged on a base; the lower pressing groove comprises a lower mold center module in the middle and a left L-shaped module and a right L-shaped module respectively arranged on both sides of the lower mold center module, and the inner surfaces of the corners of the left L-shaped module and the right L-shaped module are arc surfaces;

[0005] The left side of the left L-shaped module and the right side of the right L-shaped module are respectively provided with a left module limit baffle and a right module limit baffle; the front side and the rear side of the lower mold center module are respectively provided with a plate limit baffle;

[0006] The left module limit baffle, the right module limit baffle and the plate limit baffle are fixed on the base; the left L-shaped module flipping area is between the left module limit baffle and the lower mold center module, and the right L-shaped module flipping area is between the right module limit baffle and the lower mold center module; the left L-shaped module and the right L-shaped module are flipped and set in the left L-shaped module flipping area and the right L-shaped module flipping area respectively;

[0007] The inner surface of the left L-shaped module, the inner surface of the right L-shaped module and the upper surface of the lower mold center module cooperate to form the mold groove surface of the lower pressing groove.

[0008] By using the forming mold described in the present application, a U-shaped multi-segment arc bent plate can be formed at one time, which greatly improves the processing efficiency.

[0009] Preferably, the outer surface of the left L-shaped module includes, from bottom to top, a left bottom matching surface, a left arc-shaped transition surface, a left vertical matching surface, and a left inner inclined matching surface;

[0010] The left module limit baffle is arranged vertically, and a left lower limit hole and a left upper limit hole are respectively opened at the position where the left module limit baffle cooperates with the left vertical mating surface and the left inner inclined mating surface. The lower left limit hole and the left upper limit hole are respectively connected with a left lower limit screw and a left upper limit screw. The inner end of the lower left limit screw is threadedly connected to the left vertical mating surface, and the nut at the outer end of the lower left limit screw cooperates with the outer edge of the lower left limit hole for limiting. The inner end of the left upper limit screw is threadedly connected to the left inner inclined mating surface, and the nut at the outer end of the left upper limit screw cooperates with the outer edge of the left upper limit hole for limiting.

[0011] With such a design, the left L-shaped module can be limited when flipping within the flipping area of ​​the left L-shaped module, thereby preventing excessive flipping and improving the safety and stability of processing.

[0012] Preferably, the outer surface of the right L-shaped module includes, from bottom to top, a right bottom matching surface, a right arc-shaped transition surface, a right vertical matching surface, and a right inner inclined matching surface;

[0013] The right module limit baffle is arranged vertically, and a right lower limit hole and a right upper limit hole are respectively opened at the position where the right module limit baffle cooperates with the right vertical mating surface and the right inner inclined mating surface. The right lower limit hole and the right upper limit hole are respectively connected with a right lower limit screw and a right upper limit screw. The inner end of the right lower limit screw is threadedly connected to the right vertical mating surface, and the nut at the outer end of the right lower limit screw cooperates with the outer edge of the right lower limit hole for limiting. The inner end of the right upper limit screw is threadedly connected to the right inner inclined mating surface, and the nut at the outer end of the right upper limit screw cooperates with the outer edge of the right upper limit hole for limiting.

[0014] With such a design, the right L-shaped module can be limited when flipping within the flipping area of ​​the right L-shaped module to prevent excessive flipping, thereby improving the safety and stability of processing.

[0015] Preferably, the lower left limit hole, the upper left limit hole, the lower right limit hole and the upper right limit hole are all waist holes in the up-down direction. With such a design, the lower right limit screw and the upper right limit screw, the lower left limit screw and the upper left limit screw can move in the corresponding waist holes to cooperate with the flipping action of the L-shaped module.

[0016] Preferably, a left bottom hole is provided at the bottom of the left module limit baffle, a left flip top rod is slidably connected in the left bottom hole, and the inner end of the left flip top rod is in abutment with the left vertical mating surface; a left spring sleeve is provided at the outer end of the left bottom hole, a left flip spring is compressed in the left spring sleeve, a left spring top plate is provided at the outer end of the left spring sleeve, the left spring top plate is fixed on the base, and the two ends of the left flip spring are in contact with the left flip top rod and the left spring top plate respectively. With such a design, before the upper mold is pressed down, the left L-shaped module is in an open state, which is convenient for the upper mold to descend, and when the upper mold is fully matched with the left L-shaped module, the left L-shaped module overcomes the flipping of the left flip spring and is in a tightened state, and the sheet is extruded and formed.

[0017] Preferably, the left bottom hole is below the left lower limit hole, and a plurality of left bottom holes are arranged in a row at the same level; and two or more left lower limit holes and left upper limit holes are arranged in a row at the same level. Such a design facilitates the stable operation of the left L-shaped module when it is flipped.

[0018] Preferably, a right bottom hole is provided at the bottom of the right module limit baffle, a right flip top rod is slidably connected in the right bottom hole, and the inner end of the right flip top rod is in abutment with the right vertical mating surface; a right spring sleeve is provided at the outer port of the right bottom hole, a right flip spring is compressed in the right spring sleeve, a right spring top plate is provided at the outer port of the right spring sleeve, the right spring top plate is fixed on the base, and the two ends of the right flip spring are in contact with the right flip top rod and the right spring top plate respectively. With such a design, before the upper mold is pressed down, the right L-shaped module is in an open state, which is convenient for the upper mold to descend, and when the upper mold is fully matched with the right L-shaped module, the right L-shaped module overcomes the flipping of the right flip spring and is in a tightened state, and the sheet is extruded and formed.

[0019] Preferably, the right bottom hole is below the right lower limit hole, and a plurality of right bottom holes are arranged in a row at the same level; and two or more right lower limit holes and right upper limit holes are arranged in a row at the same level. Such a design facilitates the stable operation of the right L-shaped module when flipping.

[0020] Preferably, the left side of the left module limit baffle is further provided with a left bottom connecting horizontal plate and a left vertical reinforcing plate, the left bottom connecting horizontal plate is fixed on the base, and the left vertical reinforcing plate is arranged between the left module limit baffle and the left bottom connecting horizontal plate; the right side of the right module limit baffle is further provided with a right bottom connecting horizontal plate and a right vertical reinforcing plate, the right bottom connecting horizontal plate is fixed on the base, and the right vertical reinforcing plate is arranged between the right module limit baffle and the right bottom connecting horizontal plate. Such a design is conducive to strengthening the stability of the left module limit baffle and the right module limit baffle.

[0021] Preferably, the upper parts of the left module limit baffle and the right module limit baffle are connected to support seats, and support balls are rollingly connected to the support seats; the right module limit baffle is connected to a limit rod, and a positioning bump is provided at the outer end of the limit rod. With this design, in the initial stage of plate positioning, the initial position is positioned by the positioning bump, and in the positioning process, the support is supported by the support balls, which is more convenient when moving.

[0022] Preferably, a hydraulic cylinder is connected to the bottom of the lower mold center module, and the hydraulic cylinder drives the lower mold center module to move up and down. With this design, in the early stage of extrusion of the sheet to be processed, the hydraulic cylinder drives the lower mold center module to abut against the sheet to be processed, and as the upper pressing block moves downward synchronously, the sheet to be processed is gradually extruded and deformed.

[0023] The advantages and beneficial effects of the present invention are that by using the forming mold described in the present application, a U-shaped multi-segment arc bent plate can be formed at one time, thereby greatly improving the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A three-dimensional schematic diagram of a U-shaped multi-segment circular arc bent plate structure to be processed by the present invention;

[0025] Figure 2 A side view schematic diagram of a U-shaped multi-segment circular arc bent plate structure to be processed by the present invention;

[0026] Figure 3 It is a schematic diagram of the existing mold structure;

[0027] Figure 4 This is a schematic diagram of the mold of the present invention in an un-molded state;

[0028] Figure 5 This is a schematic diagram of the mold closing state of the present invention;

[0029] Figure 6 This is a schematic diagram of the mold closing state of the present invention (from another perspective);

[0030] Figure 7 This is a schematic diagram of the mold closing state of the present invention (the plate limit baffle is omitted);

[0031] Figure 8 It is a schematic diagram of the separation of the upper pressing block, the plate to be processed, and the lower pressing groove structure;

[0032] Fig. 9 This is a schematic diagram of the right module limit baffle structure;

[0033] Fig.10 This is a schematic diagram of the right module limit baffle structure (from another perspective);

[0034] Fig.11This is a schematic diagram of the right module limit baffle structure (the right spring top plate is omitted);

[0035] Fig.12 This is a schematic diagram of the right module limit baffle structure (the right spring sleeve is omitted);

[0036] Fig.13 This is a schematic diagram of the limit baffle structure of the right module (mold closing state);

[0037] Fig.14 This is a schematic diagram of the structure of the left module limit baffle;

[0038] Fig.15 This is a schematic diagram of the left module limit baffle structure (from another perspective);

[0039] Fig.16 This is a schematic diagram of the left module limit baffle structure (left spring top plate omitted);

[0040] Fig.17 Schematic diagram of the right module limit baffle structure (left spring sleeve omitted).

[0041] In the figure: 1. bottom plate; 2. vertical plate; 3. inner corner; 4. arc transition angle; 6. lower trough body; 7. upper mold; 8. upper pressure block; 9. lower pressure groove; 10. base; 11. lower mold center module; 12. left L-shaped module; 13. right L-shaped module; 14. arc surface; 15. left module limit baffle; 16. right module limit baffle; 17. plate limit baffle; 18. left L-shaped module flip area; 19. right L-shaped module flip area; 20. left bottom matching surface; 21. left arc transition surface; 22. left vertical matching surface; 23. left inner inclined matching surface; 24. left lower limiting hole; 25. left upper limiting hole; 26. left lower Limit screw; 27, left upper limit screw; 28, right bottom matching surface; 29, right arc transition surface; 30, right vertical matching surface; 31, right inner inclined matching surface; 32, right lower limit hole; 33, right upper limit hole; 34, right lower limit screw; 35, right upper limit screw; 36, left bottom hole; 37, left flip top rod; 38, left spring sleeve; 39, left flip spring; 40, left spring top plate; 41, right bottom hole; 42, right flip top rod; 43, right spring sleeve; 44, right flip spring; 45, right spring top plate; 46, left bottom connecting horizontal plate; 47, left vertical reinforcing plate; 48, support seat; 49, support ball; 50, limit rod; 51, positioning bump; 52, plate to be processed; 53, right bottom connecting horizontal plate; 54, and right vertical reinforcing plate; 55, hydraulic cylinder. DETAILED DESCRIPTION

[0042] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0043] like Figures 1 to 9 As shown,

[0044] like Figure 1 , Figure 2 As shown, the U-shaped multi-segment arc bent plate to be processed includes a bottom plate 1, two vertical plates 2, and an arc transition angle 4 between the two vertical plates 2 and the bottom plate 1, wherein at least one of the vertical plates 2 has an inner corner 3.

[0045] Existing molds such as Figure 3 As shown, the groove body of the lower mold is designed with a wide opening and a narrow bottom. After bending and forming, it can be demoulded smoothly and then the plate can be processed again. If the groove body is composed of fixed modules and the lower groove body 6 is designed according to the structure of the inward folding of the plate, the groove body has a narrow opening and a wide bottom, and the upper module cannot cooperate with the lower module and cannot be demoulded.

[0046] like Figure 4-17 As shown, the technical contents disclosed in the present application include: a one-time forming die for a U-shaped multi-segment circular arc bending plate of an oil tank, comprising an upper pressing block 8 and a lower pressing groove 9 matched with the upper pressing block 8; the bottom of the lower pressing groove 9 is arranged on a base 10; the lower pressing groove 9 includes a lower mold center module 11 in the middle and a left L-shaped module 12 and a right L-shaped module 13 respectively arranged on both sides of the lower mold center module 11, and the inner surfaces of the corners of the left L-shaped module 12 and the right L-shaped module 13 are arc surfaces 14;

[0047] The left side of the left L-shaped module 12 and the right side of the right L-shaped module 13 are respectively provided with a left module limit baffle 15 and a right module limit baffle 16; the front side and the rear side of the lower mold center module 11 are respectively provided with a plate limit baffle 17;

[0048] The left module limit baffle 15, the right module limit baffle 16 and the plate limit baffle 17 are fixed on the base 10; the left L-shaped module flipping area 18 is between the left module limit baffle 15 and the lower mold center module 11, and the right L-shaped module flipping area 19 is between the right module limit baffle 16 and the lower mold center module 11; the left L-shaped module 12 and the right L-shaped module 13 are flipped and set in the left L-shaped module flipping area 18 and the right L-shaped module flipping area 19 respectively;

[0049] The inner surface of the left L-shaped module 12 , the inner surface of the right L-shaped module 13 and the upper surface of the lower mold center module 11 cooperate to form the mold groove surface of the lower pressing groove 9 .

[0050] The outer surface of the left L-shaped module 12 includes, from bottom to top, a left bottom matching surface 20, a left arc-shaped transition surface 21, a left vertical matching surface 22 and a left inner inclined matching surface 23;

[0051] The left module limit baffle 15 is vertically arranged, and a left lower limit hole 24 and a left upper limit hole 25 are respectively opened at the position where the left module limit baffle 15 cooperates with the left vertical matching surface 22 and the left inner inclined matching surface 23. A left lower limit screw 26 and a left upper limit screw 27 are respectively connected to the left lower limit hole 24 and the left upper limit hole 25. The inner end of the left lower limit screw 26 is threadedly connected to the left vertical matching surface 22, and the nut at the outer end of the left lower limit screw 26 cooperates with the outer edge of the left lower limit hole 24 for limiting. The inner end of the left upper limit screw 27 is threadedly connected to the left inner inclined matching surface 23, and the nut at the outer end of the left upper limit screw 27 cooperates with the outer edge of the left upper limit hole 25 for limiting.

[0052] The outer surface of the right L-shaped module 13 includes, from bottom to top, a right bottom matching surface 28, a right arc-shaped transition surface 29, a right vertical matching surface 30 and a right inner inclined matching surface 31;

[0053] The right module limit baffle 16 is arranged vertically, and a right lower limit hole 32 and a right upper limit hole 33 are respectively opened at the position where the right module limit baffle 16 cooperates with the right vertical mating surface 30 and the right inner inclined mating surface 31. A right lower limit screw 34 and a right upper limit screw 35 are respectively connected to the right lower limit hole 32 and the right upper limit hole 33. The inner end of the right lower limit screw 34 is threadedly connected to the right vertical mating surface 30, and the nut at the outer end of the right lower limit screw 34 cooperates with the outer edge of the right lower limit hole 32 for limiting. The inner end of the right upper limit screw 35 is threadedly connected to the right inner inclined mating surface 31, and the nut at the outer end of the right upper limit screw 35 cooperates with the outer edge of the right upper limit hole 33 for limiting.

[0054] The left lower limit hole 24, the left upper limit hole 25, the right lower limit hole 32 and the right upper limit hole 33 are all waist holes in the up-down direction.

[0055] A left bottom hole 36 is provided at the bottom of the left module limit baffle 15, and a left flip top rod 37 is slidably connected in the left bottom hole, and the inner end of the left flip top rod 37 is in abutment with the left vertical mating surface 22; a left spring sleeve 38 is provided at the outer port of the left bottom hole 36, and a left flip spring 39 is compressed in the left spring sleeve 38, and a left spring top plate 40 is provided at the outer port of the left spring sleeve 38, and the left spring top plate 40 is fixed on the base 10, and the two ends of the left flip spring 39 are in contact with the left flip top rod 37 and the left spring top plate 40 respectively.

[0056] The left bottom hole 36 is located below the left lower limit hole 24, and a plurality of left bottom holes 36 are arranged in a row at the same level; the left lower limit hole 24 and the left upper limit hole 25 are arranged in a row at the same level, with two or more.

[0057] A right bottom hole 41 is provided at the bottom of the right module limit baffle 16, and a right flip top rod 42 is slidably connected in the right bottom hole, and the inner end of the right flip top rod 42 cooperates and abuts with the right vertical mating surface 30; a right spring sleeve 43 is provided at the outer port of the right bottom hole 41, and a right flip spring 44 is compressed in the right spring sleeve 43, and a right spring top plate 45 is provided at the outer end of the right spring sleeve 43, and the right spring top plate 45 is fixed on the base 10, and the two ends of the right flip spring 44 are in contact with the right flip top rod 42 and the right spring top plate 45 respectively.

[0058] The right bottom hole 41 is located below the right lower limit hole 32 , and a plurality of right bottom holes 41 are arranged in a row at the same level; the right lower limit hole 32 and the right upper limit hole 33 are arranged in a row at the same level, with two or more.

[0059] A left bottom connecting horizontal plate 46 and a left vertical reinforcing plate 47 are also provided on the left side of the left module limit baffle 15, the left bottom connecting horizontal plate 46 is fixed on the base 10, and the left vertical reinforcing plate 47 is arranged between the left module limit baffle 15 and the left bottom connecting horizontal plate 46; a right bottom connecting horizontal plate 53 and a right vertical reinforcing plate 54 are also provided on the right side of the right module limit baffle 16, the right bottom connecting horizontal plate 53 is fixed on the base 10, and the right vertical reinforcing plate 54 is arranged between the right module limit baffle 16 and the right bottom connecting horizontal plate.

[0060] The upper parts of the left module limit baffle 15 and the right module limit baffle 16 are connected to a support seat 48, and a support ball 49 is rollingly connected to the support seat 48; the right module limit baffle 16 is connected to a limit rod 50, and the outer end of the limit rod 50 is provided with a positioning protrusion 51.

[0061] The bottom of the lower mold center module 11 is connected to a hydraulic cylinder 55, and the hydraulic cylinder 55 drives the lower mold center module 11 to move up and down. A through hole is opened in the middle of the base 10 to accommodate the hydraulic cylinder drive rod to pass through.

[0062] In actual operation, under the action of the left flip spring 39, the end of the left flip push rod 37 pushes out the left vertical mating surface 22, the left bottom mating surface 20 is separated from the plane of the base 10, and the left inner inclined mating surface 23 is in contact with the left module limit baffle 15; in this state, the nut at the outer end of the left lower limit screw 26 is in contact with the outer edge of the left lower limit hole 24; the nut at the outer end of the left upper limit screw 27 is in contact with the outer edge of the left upper limit hole 25;

[0063] Similarly, under the action of the right flip spring 44, the end of the right flip push rod 42 pushes out the right vertical mating surface 30, the right bottom mating surface 28 is separated from the plane of the base 10, and the right inner inclined mating surface 31 is in contact with the right module limit baffle 16; in this state, the nut at the outer end of the right lower limit screw 34 is limited in position with the outer edge of the right lower limit hole 32; the nut at the outer end of the right upper limit screw 35 is limited in position with the outer edge of the right upper limit hole 33;

[0064] As a whole, the left L-shaped module 12 and the right L-shaped module 13 are in an open state, and the left L-shaped module 12 and the right L-shaped module 13 and the lower mold center module 11 form a lower pressing groove 9, and the upper pressing block 8 is at the upper end of the notch of the lower pressing groove 9;

[0065] At this time, the plate 52 to be processed is placed on the four supporting balls 49, and the end of the plate 52 to be processed is pushed to cooperate with the positioning protrusion 51, and the positioning is completed;

[0066] Under the action of the hydraulic cylinder, the lower mold center module 11 moves upward to contact and support the lower surface of the plate 52 to be processed, driving the upper pressing block 8 to move downward and contact the upper surface of the plate 52 to be processed. The upper pressing block 8 continues to move downward, and the lower mold center module 11 moves downward synchronously with the upper pressing block 8. The plate 52 to be processed is squeezed between the upper pressing block 8 and the lower pressing groove 9. During the downward movement of the upper pressing block 8,

[0067] The left flip spring 39 is compressed, the left vertical mating surface 22 pushes the end of the left flip push rod 37 back, the left bottom mating surface 20 is mated with the plane of the base 10, and the left inner inclined mating surface 23 is disengaged from the left module limit baffle 15; the nut at the outer end of the left lower limit screw 26 is disengaged from the outer edge of the left lower limit hole 24; the nut at the outer end of the left upper limit screw 27 is disengaged from the outer edge of the left upper limit hole 25;

[0068] The right flip spring 44 is compressed, the right vertical mating surface 30 pushes the end of the right flip push rod 42 back, the right bottom mating surface 28 is mated with the plane of the base 10, and the right inner inclined mating surface 31 is disengaged from the right module limit baffle 16; the nut at the outer end of the right lower limit screw 34 is disengaged from the outer edge of the right lower limit hole 32; the nut at the outer end of the right upper limit screw 35 is disengaged from the outer edge of the right upper limit hole 33;

[0069] On the whole, the left L-shaped module 12 and the right L-shaped module 13 are in a tightened state, and the left L-shaped module 12 and the right L-shaped module 13 and the lower mold center module 11 form a lower pressing groove 9 with a narrow opening and a large bottom. It is because of the flipping of the left L-shaped module 12 and the right L-shaped mold that the right L-shaped mold can complete the processing of the inner corner 3 at one time;

[0070] When the upper pressing block 8 and the lower pressing groove 9 are completely pressed, the pressure is maintained for a period of time, and the upper pressing block 8 is driven downward. The left L-shaped module 12 and the right L-shaped module 13 are gradually restored to the open state from the tightened state under the action of the left flip spring 39 and the right flip spring 44. Due to the open state, the opening of the lower pressing groove 9 is expanded, and the upper pressing block 8 can be demoulded smoothly. This reciprocating process is repeated.

[0071] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the invention.

Claims

1. A one-step forming die for a U-shaped multi-segment arc bending plate of a fuel tank, characterized by: It includes an upper pressing block and a lower pressing groove matched with the upper pressing block; the bottom of the lower pressing groove is arranged on a base; the lower pressing groove includes a lower mold center module in the middle and a left L-shaped module and a right L-shaped module respectively arranged on both sides of the lower mold center module, and the inner surfaces of the corners of the left L-shaped module and the right L-shaped module are arc surfaces; The left side of the left L-shaped module and the right side of the right L-shaped module are respectively provided with a left module limit baffle and a right module limit baffle; the front side and the rear side of the lower mold center module are respectively provided with a plate limit baffle; The left module limit baffle, the right module limit baffle and the plate limit baffle are fixed on the base; the left L-shaped module flipping area is between the left module limit baffle and the lower mold center module, and the right L-shaped module flipping area is between the right module limit baffle and the lower mold center module; the left L-shaped module and the right L-shaped module are flipped and set in the left L-shaped module flipping area and the right L-shaped module flipping area respectively; The inner surface of the left L-shaped module, the inner surface of the right L-shaped module and the upper surface of the lower mold center module cooperate to form a mold groove surface of the lower pressing groove; The outer surface of the left L-shaped module includes, from bottom to top, a left bottom matching surface, a left arc-shaped transition surface, a left vertical matching surface, and a left inner inclined matching surface; The left module limit baffle is vertically arranged, and a left lower limit hole and a left upper limit hole are respectively opened at the position where the left module limit baffle cooperates with the left vertical matching surface and the left inner inclined matching surface, and a left lower limit screw and a left upper limit screw are respectively connected in the left lower limit hole and the left upper limit hole, the inner end of the left lower limit screw is threadedly connected with the left vertical matching surface, and the nut at the outer end of the left lower limit screw cooperates with the outer edge of the left lower limit hole for limiting; the inner end of the left upper limit screw is threadedly connected with the left inner inclined matching surface, and the nut at the outer end of the left upper limit screw cooperates with the outer edge of the left upper limit hole for limiting; The outer surface of the right L-shaped module includes, from bottom to top, a right bottom matching surface, a right arc-shaped transition surface, a right vertical matching surface, and a right inner inclined matching surface; The right module limit baffle is vertically arranged, and a right lower limit hole and a right upper limit hole are respectively opened at the position where the right module limit baffle cooperates with the right vertical matching surface and the right inner inclined matching surface, and a right lower limit screw and a right upper limit screw are respectively connected in the right lower limit hole and the right upper limit hole, the inner end portion of the right lower limit screw is threadedly connected with the right vertical matching surface, and the nut at the outer end portion of the right lower limit screw cooperates with the outer edge of the right lower limit hole for limiting; the inner end portion of the right upper limit screw is threadedly connected with the right inner inclined matching surface, and the nut at the outer end portion of the right upper limit screw cooperates with the outer edge of the right upper limit hole for limiting; The lower left limit hole, the upper left limit hole, the lower right limit hole and the upper right limit hole are all waist holes in the up and down directions; The bottom of the left module limit baffle is provided with a left bottom hole, and a left flip top rod is slidably connected in the left bottom hole, and the inner end of the left flip top rod is matched and abutted with the left vertical matching surface; the outer port of the left bottom hole is provided with a left spring sleeve, and a left flip spring is compressed in the left spring sleeve, and a left spring top plate is provided at the outer port of the left spring sleeve, and the left spring top plate is fixed on the base, and the two ends of the left flip spring are respectively in contact with the left flip top rod and the left spring top plate; The left bottom hole is located below the left lower limit hole, and a plurality of left bottom holes are arranged in a row at the same level; the left lower limit hole and the left upper limit hole are arranged in a row at the same level; The bottom of the right module limit baffle is provided with a right bottom hole, and a right flip top rod is slidably connected in the right bottom hole, and the inner end of the right flip top rod is matched and abutted with the right vertical matching surface; the outer port of the right bottom hole is provided with a right spring sleeve, and a right flip spring is compressed in the right spring sleeve, and a right spring top plate is provided at the outer port of the right spring sleeve, and the right spring top plate is fixed on the base, and the two ends of the right flip spring are respectively in contact with the right flip top rod and the right spring top plate; The right bottom hole is located below the right lower limit hole, and a plurality of right bottom holes are arranged in a row at the same horizontal height; the right lower limit hole and the right upper limit hole are arranged in a row at the same horizontal height.

2. The one-step forming die for the U-shaped multi-segment arc bending plate of the fuel tank according to claim 1, characterized in that: A left bottom connecting horizontal plate and a left vertical reinforcing plate are also arranged on the left side of the left module limit baffle, the left bottom connecting horizontal plate is fixed on the base, and the left vertical reinforcing plate is arranged between the left module limit baffle and the left bottom connecting horizontal plate; a right bottom connecting horizontal plate and a right vertical reinforcing plate are also arranged on the right side of the right module limit baffle, the right bottom connecting horizontal plate is fixed on the base, and the right vertical reinforcing plate is arranged between the right module limit baffle and the right bottom connecting horizontal plate.

3. The one-step forming die for the U-shaped multi-segment arc bending plate of the fuel tank according to claim 1, characterized in that: The upper parts of the left module limit baffle and the right module limit baffle are connected to support seats, and support balls are rollingly connected to the support seats; the right module limit baffle is connected to a limit rod, and a positioning protrusion is arranged at the outer end of the limit rod.

4. The one-step forming die for a U-shaped multi-segment arc-bent plate of a fuel tank according to any one of claims 1 to 3, characterized in that: A hydraulic cylinder is connected to the bottom of the lower mold center module, and the hydraulic cylinder drives the lower mold center module to move up and down.

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