One-step forming process for U-shaped large arc

Abstract

The invention discloses a one-time forming process for a U-shaped large arc. The one-time forming process is used for forming a plate-shaped product into a U-shaped product. The process is realized through a forming die, and the die comprises an upper die and a lower die; the lower surface of the upper die is provided with a large arc punch and two bending punches symmetrically arranged on the left side and the right side of the large arc punch. The lower ends of the opposite faces of the two bending punches are detachably connected with wedge blocks. The upper surface of the lower die is provided with two push blocks which are bilaterally symmetrical, the upper ends of the opposite surfaces of the two push blocks are provided with arc-shaped grooves, and when the two push blocks are close to each other, the two arc-shaped grooves jointly define a semicircular groove; the opposite faces of the two push blocks are each connected with a reset spring, and the upper ends of the opposite faces of the two push blocks are each matched with one wedge-shaped block through a wedge-shaped face. The upper ends of the opposite groove walls of the two arc-shaped grooves vertically extend upwards and gradually incline inwards. The U-shaped product is formed at a time through one set of die, the equipment cost is low, the straight line part of the machined U-shaped product is in a 90-degree vertical state, and the precision is high.

Description

Technical Field

[0001] The invention relates to the field of sheet metal processing, and in particular to a U-shaped large arc one-step forming process. Background Art

[0002] In the field of sheet metal processing, the forming of U-shaped structures is a common but complex task. In the current industry, the processing of U-shaped sheet metal usually adopts a two-bending process: first, the middle part of the straight sheet is bent into a large arc to form the bottom of the U; then the straight parts at both ends of the sheet are pushed inward to 90° through the side push die to complete the U-shaped side wall forming. However, this traditional processing method has many limitations in practical applications, which are mainly reflected in the following aspects: High cost: Since two independent sets of molds are required to complete the middle bending and side wall forming respectively, the manufacturing, maintenance and replacement costs of the molds are high, which increases the company's production investment.

[0003] Low efficiency: The two-bending process needs to be performed step by step and cannot achieve one-time forming, which leads to a complicated and time-consuming processing flow and is difficult to meet the needs of large-scale production.

[0004] Insufficient precision: For metal sheets with a certain elasticity (such as some aluminum alloys or high-strength steel), after the side push die bends the two ends of the sheet to 90°, due to the elastic properties of the material itself and the influence of the large arc structure in the middle, the bent part is prone to springback, resulting in the actual angle of the straight parts at both ends being less than 90°, which cannot meet the product design requirements. In this case, additional adjustments or secondary processing are often required, which further increases the process cost and reduces production efficiency.

[0005] In addition, as the market's requirements for metal sheet processing accuracy and efficiency continue to increase, the limitations of the traditional double bending process have become increasingly apparent. Especially in the automotive, aerospace, home appliance and other industries, U-shaped metal sheets are increasingly widely used, and companies are more urgently in need of low-cost, high-efficiency, and high-precision processing technology. Therefore, optimizing the existing process and developing a U-shaped sheet forming method that can balance cost, efficiency, and accuracy has become a key issue that the industry needs to solve. Summary of the invention

[0006] The purpose of the invention is to provide a U-shaped large arc one-step forming process.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: A U-shaped large arc one-step forming process is used to form a plate-shaped product into a U-shaped product. The process is implemented by a forming mold, and the mold includes an upper mold and a lower mold; The lower surface of the upper die has a large arc punch and two bending punches symmetrically arranged on the left and right sides of the large arc punch, and the lower ends of the opposite surfaces of the two bending punches are detachably connected with wedge blocks; The upper surface of the lower mold has two left-right symmetrical push blocks, and the upper ends of the opposite surfaces of the two push blocks are provided with arc grooves, and when the two push blocks are close to each other, the two arc grooves jointly define a semicircular groove; the opposite back surfaces of the two push blocks are connected to a return spring, and the upper ends of the opposite back surfaces of the two push blocks are matched with a wedge block through a wedge surface; The two arc-shaped grooves extend vertically upward relative to the upper ends of the groove walls and gradually tilt inward to form an inclined abutment portion; an inclined support portion matching the inclined abutment portion is provided at the upper end of the side wall of the head of the large arc punch; The process comprises: Placing the plate-shaped product on the upper surfaces of the two push blocks, where the upper surfaces of the two push blocks serve as supporting planes; The upper die drives the large arc punch and the two bending punches to move downward, and the large arc punch pushes the plate-like product into between the two arc grooves; When the upper die moves downward, the two push blocks are pushed closer to each other by the two wedge-shaped blocks, and the two arc-shaped grooves bend the plate-shaped product inwardly at both sides; When the middle part of the plate-shaped product reaches the groove bottom between the two arc-shaped grooves, the straight part of the plate-shaped product is bent upward and tilted inward at the same time through the cooperation of the inclined abutment part and the inclined support part; Finally, the upper die drives the large arc punch and the two bending punches to move upward, the two reset springs drive the two push blocks to reset away from each other, and the straight part rebounds to a 90° vertical state, thereby obtaining the U-shaped product; Take out the U-shaped product.

[0008] Further preferably, the inward inclination angles of the inclined abutting portion and the straight portion are the same and are both less than 10°.

[0009] Further preferably, the inward inclination angles of the upper end of the inclined abutment portion and the straight portion are the same and are both 3°.

[0010] Further preferably, the upper end of the inclined abutting portion is configured as a rounded corner.

[0011] Preferably, the upper die comprises an upper die seat, an upper pad, an upper clamping plate and a stop plate which are arranged in sequence from top to bottom; The upper pad and the upper die seat are detachably connected, the upper clamping plate and the stop plate are detachably connected, and both are slidably matched with the upper die seat up and down through a nitrogen spring; The upper end of the large arc punch is connected to a stripping insert, which is detachably connected to the stop plate via a headless screw; The bending punch is detachably connected to the upper pad by screws.

[0012] Further preferably, bending blocks are provided on both sides of each bending punch, and the bending blocks are detachably connected to the upper pad via screws.

[0013] Preferably, the lower mold includes a lower mold base, a lower pad and a lower clamping plate which are arranged in sequence from bottom to top, the lower pad is detachably connected to the lower mold base, the lower clamping plate is detachably connected to the lower pad, and the two push blocks are slidably arranged on the upper surface of the lower clamping plate.

[0014] Further preferably, two lower blocks and two side blocks are provided on the upper surface of the lower clamp, the two lower blocks are located below the two bending punches, the two side blocks are located outside the two bending punches, and the inner side walls of the side blocks are in contact with the outer side walls of the bending punches when the mold is closed.

[0015] Further preferably, a bolt is sleeved on the outside of the return spring, and the bolt passes through the side block. The return spring is sleeved on the outside of the bolt, and two ends of the return spring abut against the head of the bolt and the side block respectively.

[0016] Further preferably, a waist-shaped hole is provided through the upper and lower surfaces of the two push blocks, the length direction of the waist-shaped hole is the moving direction of the push block, a positioning rod for positioning the plate-like product is provided in the waist-shaped hole, and a T-shaped hole is provided on the lower clamping plate, the upper end of the T-shaped hole is clamped with the positioning rod, and the lower end has a fastening screw, the fastening screw is threadedly connected to the lower end of the positioning rod and the nail head of the fastening screw rests against the lower surface of the lower clamping plate.

[0017] Further preferably, there is a floating block between the two pushing blocks, the upper end surface of the floating block corresponds to and fits with the middle part of the lower surface of the U-shaped product, the lower clamping plate and the lower pad corresponding to the lower end of the floating block are provided with through holes, and the floating block is driven to move upward in the through hole to push the U-shaped product to above the semicircular groove.

[0018] Further preferably, the floating block is configured as an inverted T-shape, with its lower end slidingly engaged with the through hole and its upper end being located between the two push blocks and moving in and out of the semicircular groove under the drive.

[0019] Further preferably, the drive includes a push rod, and the push rod is driven by a cylinder to push the floating block upward.

[0020] The working principle and advantages of the present invention are as follows: The present invention divides the semicircular groove of the formed product into two parts. When the large arc punch moves downward, the wedge block at the lower end of the bending punch cooperates with the two push blocks on the lower die through the wedge surface, so that the two push blocks are close to each other. When the large arc punch moves down into place, the arc groove between the two push blocks merges into a semicircular groove, so that a U-shaped product can be formed at one time using a set of molds. The entire mold structure is cleverly designed, the product has a high one-time forming rate, the processing cost and equipment cost are reduced, and the processing efficiency is improved.

[0021] The upper ends of the groove walls on both sides of the semicircular groove of the present invention are inclined inward and set to rounded corners, which can make the two straight parts of the product bend inward, and then the straight parts rebound outward to a 90° vertical state after the product is demoulded. The product does not need to be bent and repaired for the second time, which reduces processing costs and improves production efficiency.

[0022] The present invention utilizes the wedge-shaped surface to link the two push blocks to move horizontally when the upper mold moves downward, which can not only realize the one-time forming of the U-shaped product, but also can realize interference-free docking and engagement of the large arc punch and the semicircular groove with the upper end retracted, thereby overcoming the technical obstacle that the large arc punch cannot enter the fixed semicircular groove due to the retraction of the upper end of the semicircular groove, and realizing the one-time forming of the U-shaped product with the upper end retracted. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Attached Figure 1 It is a side view of the embodiment of the present invention in the mold opening state; Attached Figure 2 It is a side view of the embodiment of the present invention in the mold closing state; Attached Figure 3 For the present invention Figure 2 The enlarged view of the structure when the straight part of the middle A part is bent to an inward tilted state; Attached Figure 4 This is an enlarged view of the structure when the straight portion of the present invention rebounds to a vertical state; Attached Figure 5 For the present invention Figure 2 A magnified view of the structure of part B; Attached Figure 6 For the present invention Figure 1 A magnified view of the structure of part C in the middle; Attached Figure 7 A bottom view of the upper mold of an embodiment of the present invention; Attached Figure 8 This is a front view of the upper mold of an embodiment of the present invention; Attached Fig. 9 A top view of the lower mold according to an embodiment of the present invention; Attached Fig.10 This is a front view of the lower mold according to an embodiment of the present invention; Attached Fig.11 For the present invention Fig. 9 Enlarged view of the structure of part D in the middle.

[0024] In the above drawings: 100 upper die; 101 upper die base; 102 upper pad; 103 upper clamping plate; 104 stopper plate; 105 stripping plate insert; 106 nitrogen spring; 200 lower die; 201 lower die base; 202 lower pad; 203 lower clamping plate; 300 plate products; 400U type product; 1 large arc punch; 2 bending punch; 3 wedge block; 31 second wedge surface; 4 push block; 41 arc groove; 42 first wedge surface; 43 waist hole; 44 inclined abutment portion; 5 return spring; 6 bending block; 7 lower block; 8 side block; 9 bolt; 10 floating block; 11 ejector rod; 12 positioning rod; 13 T-hole; 14 fastening screw; 15 inclined support portion. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Embodiment: The present invention will be clearly described below with diagrams and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0026] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0027] As used herein, “connected” or “positioned” may refer to two or more components or devices being in direct physical contact with each other, or being in indirect physical contact with each other, or may refer to two or more components or devices operating or moving with each other.

[0028] The terms “include,” “including,” “have,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0029] The terms used in this document generally have the ordinary meaning of each term used in this field, in the context of the case and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present invention.

[0030] The terms "front", "back", "up", "down", "left", "right", etc. used in this article are all directional terms. In this case, they are only used to illustrate the positional relationship between the various structures, and are not used to limit the protection plan of this case and the specific direction during actual implementation.

[0031] See attached Figure 1-11 As shown, a U-shaped large arc one-step forming process is used to form a plate-like product 300 into a U-shaped product 400; the process is implemented by a forming mold, and the mold includes an upper mold 100 and a lower mold 200.

[0032] The lower surface of the upper die 100 has a large arc punch 1 and two bending punches 2 symmetrically arranged on the left and right sides of the large arc punch 1, and the lower ends of the opposite surfaces of the two bending punches 2 are detachably connected with wedge blocks 3; The upper surface of the lower die 200 has two left-right symmetrical push blocks 4, and the upper ends of the opposite surfaces of the two push blocks 4 are both provided with arc grooves 41, and when the two push blocks 4 are close to each other, the two arc grooves 41 jointly define a semicircular groove; the first wedge surface 42 at the upper ends of the opposite back surfaces of the two push blocks 4 cooperates with the second wedge surface 31 on the inner side of the lower end of the wedge block 3; when the upper die 100 moves downward, the large arc punch 1 pushes the plate-like product 300 into between the two arc grooves 41, and the two wedge blocks 3 push the two push blocks 4 close to each other, and the two arc grooves 41 merge into a semicircular groove, and the two arc grooves 41 bend the plate-like product 300 laterally to form the U-shaped product 400; The opposite back surfaces of the two push blocks 4 are connected to a return spring 5, so that when the two push blocks 4 are pushed by the wedge block 3 and approach each other, the two return springs 5 ​​store force, and when the two push blocks 4 are not pushed by the wedge block 3, the two return springs 5 ​​push the two push blocks 4 to return.

[0033] In this embodiment, the two arc grooves 41 extend vertically upward relative to the upper end of the groove wall and gradually tilt inward to form an inclined abutment portion 44; the upper end of the head side wall of the large arc punch 1 is provided with an inclined support portion 15 that cooperates with the inclined abutment portion 44, so that the large arc punch 1 matches the two arc grooves 41, so that when the plate-like product 300 is bent to fit with the two arc grooves 41, the two end straight portions of the U-shaped product 400 tilt inward and rebound to a 90° vertical state after leaving the arc groove 41. The inward inclination angles of the inclined abutment portion 44 and the straight portion are the same and are both less than 10°. For products with different rebound coefficients, the inclination angle can be adjusted as long as the two end straight portions of the bent product can rebound to a 90° vertical state. For general sheet metal products, the two arc grooves 41 tilt inward by 3° relative to the upper end of the groove wall, and the angle between the two end straight portions of the U-shaped product 400 and the vertical direction is 3°.

[0034] In the present embodiment, since the large arc punch 1 is matched with the two arc grooves 41, the upper ends of both sides of the large arc punch 1 are retracted. If the two arc grooves are designed as an integrated groove, the large arc punch 1 cannot enter the groove. Therefore, the present embodiment divides the semicircular groove into two parts. When the large arc punch 1 moves downward, the wedge block 3 at the lower end of the bending punch cooperates with the two push blocks 4 on the lower mold 200 through the wedge surface, so that the two push blocks 4 are close to each other. When the large arc punch 1 moves down into place, the arc groove 41 between the two push blocks 4 merges into a semicircular groove, which can realize the inward inclined bending of the two straight parts of the U-shaped product 400. After the product is demolded, the rebound force brought by its own material will make the two straight parts in a 90° vertical state.

[0035] In this embodiment, in order to avoid damaging the product and to make the product bend smoothly, the upper end of the inclined abutment portion 44 is configured as a rounded corner.

[0036] In this embodiment, the upper mold 100 includes an upper mold base 101, an upper pad 102, an upper clamping plate 103 and a stop plate 104 which are arranged in sequence from top to bottom; the upper pad 102 and the upper mold base 101 are detachably connected by screws, the upper clamping plate 103 and the stop plate 104 are detachably connected by screws and both are slidably matched with the upper mold base 101 up and down through a nitrogen spring 106. Specifically, the upper end of the nitrogen spring 106 passes through the upper pad 102 and is fixed on the upper mold base 101, and the lower end is fixedly connected to the upper clamping plate 103.

[0037] The upper end of the large arc punch 1 is connected with a stripping insert 105, and the stripping insert 105 is detachably connected to the stop plate 104 via a headless screw.

[0038] The bending punch 2 is detachably connected to the upper pad 102 via screws.

[0039] In order to ensure stable up and down movement of the bending punch 2, a bending stopper 6 is provided on both sides of each bending punch 2. The outer bending stopper 6 is detachably connected to the upper pad 102 by screws, and the inner bending stopper 6 passes through the upper pad 102 and is detachably connected to the upper pad 102 by headless screws.

[0040] In this embodiment, a waist-shaped hole 43 is provided through the upper and lower surfaces of the two push blocks 4, and the length direction of the waist-shaped hole 43 is the moving direction of the push block 4. A positioning rod 12 for positioning the plate-like product is provided in the waist-shaped hole 43, and a T-shaped hole 13 is provided on the lower clamp plate 203. The upper end of the T-shaped hole 13 is clamped with the positioning rod 12, and the lower end has a fastening screw 14, which is threadedly connected to the lower end of the positioning rod 12 and the nail head of the fastening screw 14 is against the lower surface of the lower clamp plate 203.

[0041] Through the design of the positioning rod 12, the two ends of the bending direction of the plate-like product can be limited to ensure the accuracy of the bending position. When the push block 4 moves, the positioning rod 12 does not move, and the push block 4 drives the waist-shaped hole 43 to move.

[0042] In this embodiment, the lower mold 200 includes a lower mold base 201, a lower pad 202 and a lower clamping plate 203 which are arranged in sequence from bottom to top. The lower pad 202 is detachably connected to the lower mold base 201 by screws, and the lower clamping plate 203 is detachably connected to the lower pad 202 by screws. The two push blocks 4 are slidably arranged on the upper surface of the lower clamping plate 203.

[0043] In order to prevent the bending punch 2 from hitting and damaging the lower die 200 , two lower stops 7 are provided on the upper surface of the lower clamp plate 203 . The lower stops 7 are detachably connected to the lower clamp plate 203 by screws. The two lower stops 7 are located below the two bending punches 2 .

[0044] In order to position and guide the bending punch 2, two side blocks 8 are provided on the upper surface of the lower clamp plate 203, and the side blocks 8 are detachably connected to the lower clamp plate 203 by screws. The two side blocks 8 are located on the outside of the two bending punches 2, and the inner side walls of the side blocks 8 are in contact with the outer side walls of the bending punch 2 when the mold is closed.

[0045] In this embodiment, in order to ensure the stable movement of the push block 4 and facilitate the installation of the reset spring 5, a bolt 9 is sleeved on the outside of the reset spring 5, and the bolt 9 passes through the side block 8. The reset spring 5 is sleeved on the outside of the bolt 9 and the two ends of the reset spring 5 are respectively against the head of the bolt 9 and the side block 8. When the two push blocks 4 are close to each other, the two push blocks 4 drive the bolt 9 to move, and the bolt 9 is positioned by the side block 8 to ensure the stable movement of the push block 4. The bolt 9 moves inward to compress the reset spring 5, so that the reset spring 5 accumulates force. When the mold is opened, the push block 4 is not subjected to thrust, and the push block 4 can be quickly reset under the action of the reset spring 5 to prepare for the next molding work.

[0046] In this embodiment, after the U-shaped product 400 is formed, it will fit tightly with the semicircular groove and be difficult to cut. To facilitate cutting, a floating block 10 is provided between the two push blocks 4 in this embodiment. The upper end surface of the floating block 10 corresponds to and matches the middle part of the lower surface of the U-shaped product 400. The lower clamping plate 203 and the lower pad 202 corresponding to the lower end of the floating block 10 are provided with through holes. The floating block 10 is driven to move upward in the through hole to push the U-shaped product 400 to the top of the semicircular groove. The floating block 10 is set to an inverted T shape, with its lower end slidingly matched with the through hole, and its upper end is located between the two push blocks 4 and enters and exits the semicircular groove under the drive. The drive includes a push rod 11, and the push rod 11 is driven by a cylinder to push the floating block 10 upward.

[0047] When the product is formed, the cylinder can be started, and the cylinder drives the push rod 11 to push the floating block 10 upward. The upper end of the floating block 10 pushes the product upward to leave the semicircular groove. After the product is removed, the cylinder drives the push rod 11 downward again, and the floating block 10 is reset under the action of gravity.

[0048] The above-mentioned one-shot molding die is used to realize the following molding processes, including: Step 1: Place the plate-shaped product 300 on the upper surfaces of the two push blocks 4. At this time, the upper surfaces of the two push blocks 4 serve as support planes, and the two ends are positioned by the positioning rods 12 protruding from the upper surfaces of the push blocks 4; Step 2: The upper die 100 drives the large arc punch 1 and the two bending punches 2 to move downward, and the large arc punch 1 pushes the plate-like product 300 into between the two arc grooves 41; When the upper mold 100 moves downward, the two push blocks 4 are pushed closer to each other by the two wedge blocks 3, and the two arc grooves 41 bend the plate-like product 300 inwardly at both sides; When the middle of the plate-shaped product 300 reaches the bottom of the groove between the two arc-shaped grooves 41, the straight portion of the plate-shaped product 300 is bent upward and tilted inward at the same time through the combined action of the inclined abutment portion 44 and the inclined support portion 15. Figure 3 ; Step 3: The upper die 100 drives the large arc punch 1 and the two bending punches 2 to move upward, and the two reset springs 5 ​​drive the two push blocks 5 to reset away from each other, and the straight part rebounds to a 90° vertical state to obtain the U-shaped product 400. Figure 4 ; During step 4 and step 3, the cylinder pushes the push rod 11 upward, and the push rod 11 pushes the floating block 10 upward. The floating block 10 pushes the U-shaped product 400 thereon to above the push block 4, and the U-shaped product 400 can be removed.

[0049] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A U-shaped large arc one-step forming process for forming a plate-shaped product (300) into a U-shaped product (400), characterized in that: The process is implemented by a molding die, which includes an upper die (100) and a lower die (200); The lower surface of the upper die (100) comprises a large arc punch (1) and two bending punches (2) symmetrically arranged on the left and right sides of the large arc punch (1), and the lower ends of the opposite surfaces of the two bending punches (2) are detachably connected with wedge blocks (3); The upper surface of the lower mold (200) has two left-right symmetrical push blocks (4), and the upper ends of the opposing surfaces of the two push blocks (4) are each provided with an arc groove (41), and when the two push blocks (4) are in a close state, the two arc grooves (41) jointly define a semicircular groove; the opposing surfaces of the two push blocks (4) are each connected to a return spring (5), and the upper ends of the opposing surfaces of the two push blocks (4) are each matched with a wedge block (3) through a wedge surface; The two arc-shaped grooves (41) extend vertically upward relative to the upper ends of the groove walls and gradually tilt inwards to form an inclined abutment portion (44); an inclined support portion (15) cooperating with the inclined abutment portion (44) is provided at the upper end of the head side wall of the large arc punch (1); The process comprises: Placing the plate-shaped product (300) on the upper surfaces of the two push blocks (4), with the upper surfaces of the two push blocks (4) serving as support planes; The upper die (100) drives the large arc punch (1) and the two bending punches (2) to move downward, and the plate-shaped product (300) is pushed into between the two arc-shaped grooves (41) by the large arc punch (1); When the upper mold (100) moves downward, the two push blocks (4) are pushed toward each other by the two wedge blocks (3), and the two arc grooves (41) bend the plate-like product (300) inwardly at both sides; When the middle of the plate-shaped product (300) reaches the groove bottom between the two arc-shaped grooves (41), the inclined abutment portion (44) and the inclined support portion (15) work together to cause the straight portion of the plate-shaped product (300) to bend upward and tilt inward at the same time; Finally, the upper die (100) drives the large arc punch (1) and the two bending punches (2) to move upward, the two reset springs (5) drive the two push blocks (4) to reset away from each other, and the straight portion rebounds to a 90° vertical state, thereby obtaining the U-shaped product (400); The U-shaped product (400) is taken out.

2. A U-shaped large arc one-step forming process according to claim 1, characterized in that: The inclined abutment portion (44) and the straight portion have the same inward inclination angle and are both less than 10°, and the upper end of the inclined abutment portion (44) is configured as a rounded corner.

3. The U-shaped large arc one-step forming process according to claim 1, characterized in that: The upper die (100) comprises an upper die base (101), an upper pad (102), an upper clamping plate (103) and a stop plate (104) which are arranged in sequence from top to bottom; The upper pad (102) and the upper die seat (101) are detachably connected, the upper clamping plate (103) and the stop plate (104) are detachably connected, and both are slidably matched with the upper die seat (101) via a nitrogen spring (106); The upper end of the large arc punch (1) is connected to a plate-removing insert (105), and the plate-removing insert (105) is detachably connected to the stop plate (104); The bending punch (2) is detachably connected to the upper pad (102), and bending blocks (6) are provided on both sides of each bending punch (2), and the bending blocks (6) are detachably connected to the upper pad (102).

4. The U-shaped large arc one-step forming process according to claim 1, characterized in that: The lower die (200) comprises a lower die base (201), a lower pad (202) and a lower clamping plate (203) which are arranged in sequence from bottom to top; the lower pad (202) is detachably connected to the lower die base (201); the lower clamping plate (203) is detachably connected to the lower pad (202); and the two push blocks (4) are slidably arranged on the upper surface of the lower clamping plate (203).

5. A U-shaped large arc one-step forming process according to claim 4, characterized in that: Two lower blocks (7) and two side blocks (8) are arranged on the upper surface of the lower clamping plate (203), wherein the two lower blocks (7) are located below the two bending punches (2), and the two side blocks (8) are located outside the two bending punches (2), and when the mold is closed, the inner side walls of the side blocks (8) are in contact with the outer side walls of the bending punches (2).

6. A U-shaped large arc one-step forming process according to claim 5, characterized in that: A bolt (9) is sleeved on the outside of the return spring (5), and the bolt (9) passes through the side block (8). The return spring (5) is sleeved on the outside of the bolt (9), and two ends of the return spring (5) are respectively in contact with the head of the bolt (9) and the side block (8).

7. The U-shaped large arc one-step forming process according to claim 4, characterized in that: A waist-shaped hole (43) is provided through the upper and lower surfaces of the two push blocks (4), the length direction of the waist-shaped hole (43) is the moving direction of the push block (4), a positioning rod (12) for positioning the plate-like product (300) is provided in the waist-shaped hole (43), and a T-shaped hole (13) is provided on the lower clamping plate (203), the upper end of the T-shaped hole (13) is clamped with the positioning rod (12), and the lower end has a fastening screw (14), the fastening screw (14) is threadedly connected to the lower end of the positioning rod (12), and the nail head of the fastening screw (14) is against the lower surface of the lower clamping plate (203).

8. The U-shaped large arc one-step forming process according to claim 5, characterized in that: A floating block (10) is provided between the two pushing blocks (4), the upper end surface of the floating block (10) corresponds to and fits with the middle of the lower surface of the U-shaped product (400), and the lower clamping plate (203) and the lower pad (202) corresponding to the lower end of the floating block (10) are provided with through holes, and the floating block (10) is driven to move upward in the through hole to push the U-shaped product (400) to the top of the semicircular groove.

9. A U-shaped large arc one-step forming process according to claim 8, characterized in that: The floating block (10) is configured in an inverted T shape, with its lower end slidingly engaged with the through hole, and its upper end being located between the two push blocks (4) and moving in and out of the semicircular groove under the drive.

10. A U-shaped large arc one-step forming process according to claim 9, characterized in that: The drive comprises a push rod (11), and the push rod (11) is driven by a cylinder to push the floating block (10) upward.

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