Square tube concave bag cold press forming die

Abstract

The utility model relates to punch die technical field discloses a square tube concave bag cold pressure forming die, including upper die assembly, lower die assembly and slider assembly, upper die assembly includes upper tool block, lower die assembly includes lower tool block and lower die base, is equipped with core mould assembly between upper tool block and lower tool block, the core mould assembly includes setting on the core die base, a pair of core mould plate symmetrical setting is fixed on the core die base, a wedge -shaped slot is formed between two core mould plates, and the core mould that two core mould plates constitute is wedge -shaped under the die -open state, the core mould plate is formed with female die groove, and the upper tool block and lower tool block each form the male die face corresponding with female die groove on, the slider assembly includes the wedge -shaped slider of bushing in wedge -shaped slot. Realize square tube concave bag forming without heating, avoid square tube performance damage, reduce production cost, guarantee forming accuracy simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, and in particular to a square tube concave cold pressing forming die. Background Technology

[0002] With the rapid development of mold technology, cold pressing of metals has widely adopted mold stamping processes. Currently, pressing concave embossing onto square tube-like rotating bodies, the structure of square tube 9 and concave embossing 91 is as follows: Figure 7 As shown, a hot extrusion die process can be used, in which a heated metal billet is placed in a square die, and high pressure is applied using a punch to fill the die cavity with the billet. After cooling and shaping, a square tube with a concave rim is obtained. However, this method has significant limitations for square tubes that have already undergone the punching process: 1. Redundant costs due to secondary heating: If the square tube after punching is heated again and hot extrusion is carried out, the high temperature process can easily cause deformation of the square tube structure, changes in microstructure or surface oxidation, which will damage its existing geometric features (such as hole position accuracy and surface condition) and mechanical properties, requiring additional repair processing, resulting in redundant costs.

[0003] 2. Insufficient economic efficiency of the process: Even if the square tube with concave rim is formed by hot extrusion die process from the billet stage, the overall production cost is high due to the strict requirements of high temperature resistant materials and large energy consumption, which makes it lack economic advantages, especially in small-batch or customized production. Utility Model Content

[0004] The purpose of this invention is to provide a cold-pressing mold for square tube concave forming, which enables the concave forming of square tubes without heating, avoiding damage to the performance of square tubes, reducing production costs, and ensuring forming accuracy.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: A square tube concave cold pressing forming mold includes an upper mold assembly, a lower mold assembly and a slider assembly. The upper mold assembly includes an upper cutting block, which is fixed in an upper cutting block fixing seat. The upper cutting block fixing seat is fixed on the lower end face of an upper pad, and the upper pad is fixed on the lower end face of an upper mold base. The lower mold assembly includes a lower cutting block, which is fixed in a lower cutting block fixing seat. The lower cutting block fixing seat is fixed on a lower pad, which is fixed on a lower mold base. Multiple lower mold feet are fixed at the bottom of the lower mold base. A core mold assembly is provided between the upper and lower cutting blocks; The core mold assembly includes a core mold base disposed on a lower mold base, and a pair of core mold plates symmetrically arranged vertically are fixed on the core mold base. A wedge-shaped groove is formed between the two core mold plates. The core mold composed of the two core mold plates is wedge-shaped in the mold-open state. A cavity groove is formed on the core mold plate, and a punch surface corresponding to the cavity groove is formed on the upper and lower cutting blocks respectively. The slider assembly includes a wedge-shaped slider that is fitted into a wedge groove.

[0006] During operation, the upper die holder is fixed to the lifting pressure head of the press, and the lower die foot is fixed to the worktable of the press. The press is electrically connected to the controller. The end of the square tube to be pressed into a concave shape is inserted into the two core templates. Then, the wedge-shaped slider is inserted into the wedge groove to open the two core templates, causing them to press against the inner wall of the square tube. This transforms the core mold, composed of the two core templates, from a wedge shape to a square column shape. The lifting pressure head of the press then moves the upper die assembly downwards, and the upper die block moves to the lower die block. The punch surface of the upper die block and the die groove of the upper core template form a concave cavity, and the punch surface of the lower die block and the die groove of the lower core template also form a concave cavity. The upper and lower sidewalls of the square tube are squeezed into the concave cavities, thus forming a concave shape on the square tube. After the concave shape is formed, the wedge-shaped slider moves outwards and resets, the two core templates move closer together and reset, and the die surfaces on the core templates detach from the concave shape of the square tube. Then, the press moves the upper die assembly upwards and resets, removing the square tube.

[0007] Preferably, the outer end of the wedge-shaped slider is fixed to the push-pull block, the push-pull block is fixed to the end of the piston rod of the cylinder, the cylinder is fixed to the bracket, and the bracket is fixed to the core mold base. During operation, the cylinder is connected to a high-pressure air source via an air pipe and a solenoid valve. The solenoid valve is electrically connected to a controller. The controller extends and retracts the piston rod of the cylinder, causing the push-pull block to move, which in turn moves the wedge-shaped slider. Before the concave molding, the wedge-shaped slider is inserted into the wedge-shaped groove. The compression of the wedge-shaped slider enlarges the wedge-shaped groove, thus distancing the two core mold templates from each other. After the concave molding, the wedge-shaped slider moves outward and resets under the contraction of the piston rod of the cylinder. The core mold templates lose the support of the wedge-shaped slider, and the core mold templates move closer together.

[0008] Preferably, the end of the wedge-shaped slider away from the cylinder is formed with an arc-shaped end. By setting the arc-shaped end, the resistance when the wedge-shaped slider extrudes the core template can be reduced.

[0009] Preferably, the core template includes an integrally formed rectangular block and a gradually elongated module. The wall thickness of the gradually elongated module increases as it moves further away from the rectangular block. The wall thickness of the gradually elongated module is smaller at the end closest to the rectangular block, which facilitates the deformation of the core template under the extrusion of the wedge-shaped slider. The rectangular blocks of the two core templates are placed together to ensure the relative positional relationship between the two core templates.

[0010] Preferably, the wedge-shaped slider includes a rectangular segment and a wedge-shaped segment; The rectangular block has a guide groove formed on it, and the rectangular segment is inserted into the guide hole formed by the guide grooves of the two rectangular blocks, thereby guiding the movement of the wedge slider.

[0011] Preferably, the lower mold base is fixed with a plurality of guide posts and limiting posts; The upper mold base is fixed with a guide sleeve that cooperates with the guide post.

[0012] When the upper mold base moves downward, it drives the guide sleeve to move downward. The guide sleeve is inserted into the guide post, thereby guiding the upper mold assembly and the lower mold assembly. When the upper mold base continues to move downward, the bottom surface of the upper mold base abuts against the top of the limit post, thereby preventing the upper mold base from moving downward further and limiting the mold closing distance between the upper mold assembly and the lower mold assembly, thus preventing excessive pressing during the square tube concave molding.

[0013] Preferably, the upper and lower cutting blocks each have two side die pillars formed on them, and the two side die pillars are located at both ends of the punch surface.

[0014] The side mold posts on the lower die block can position the square tube when it is inserted, preventing it from shifting to the side. After the mold is closed, the side mold posts on the upper and lower die blocks abut against the side wall of the square tube, thereby restricting the square tube from deforming to the side when forming the concave shape.

[0015] Preferably, the core mold base is fixed with a plurality of connecting seats, the connecting seats are fixed on the piston rod of the nitrogen cylinder, and the nitrogen cylinder is fixed on the lower mold base; The core mold base has multiple stepped holes formed on it, and stepped rods are sleeved inside the stepped holes. The stepped rods are fixed on the lower mold base.

[0016] By fixing the core mold base to multiple nitrogen cylinders, the core mold base can be in a flexible floating state. During the pressing of the concave shape, the core template will move downward slightly with the mold closing action. After being stressed, the core template will drive the core mold base downward, which can improve the forming quality of the concave shape. The upward movement of the core mold base can be limited by the step rod.

[0017] The outstanding effect of this utility model is: Compared with existing technologies, the cold pressing process eliminates the need for secondary heating, preventing deformation, oxidation, or performance damage to the square tube caused by high temperatures. It is especially suitable for the secondary processing of punched square tubes.

[0018] The core template is driven by a wedge-shaped slider to tighten the inner wall of the square tube. Combined with the lateral limiting of the side mold pillars, this effectively avoids instability and deformation during the forming of the square tube, ensuring the accuracy of the concave dimensions and hole positions.

[0019] It eliminates the need for heating equipment and energy consumption, reduces repair procedures, and features a simple and versatile mold structure, making it highly economical for small-batch or customized production. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the upper mold assembly of this utility model; Figure 3 This is a schematic diagram of the lower mold assembly of this utility model; Figure 4 This is a schematic diagram of the assembly of the core mold assembly and the slider assembly of this utility model; Figure 5 This is a first sectional view of the present invention; Figure 6 This is a second sectional view of the present invention; Figure 7 This is a schematic diagram of the square tube involved in this utility model.

[0021] Reference numerals: 1. Upper mold assembly; 11. Upper cutter block; 12. Upper cutter block fixing seat; 13. Upper backing plate; 14. Upper mold base; 15. Guide sleeve; 2. Lower mold assembly; 21. Lower cutter block; 22. Lower cutter block fixing seat; 23. Lower backing plate; 24. Lower mold base; 25. Lower mold foot; 26. Guide post; 27. Limiting post; 3. Core mold assembly; 31. Core mold base; 32. Core template; 321. Rectangular block; 322. Gradual elongation module; 323. Guide groove; 33. Wedge groove; 34. Die groove; 35. Connecting seat; 36. Nitrogen cylinder; 37. Step rod; 4. Slider assembly; 41. Wedge slider; 411. Rectangular segment; 412. Wedge segment; 42. Push-pull block; 43. Cylinder; 44. Bracket; 45. Arc end; 9. Square tube; 91. Concave rim; 101. Side mold pillar; 102. Punch surface. Detailed Implementation

[0022] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0023] The following is for reference Figures 1 to 7 The present invention will be described as follows: A type of square tube concave cold pressing mold, such as Figure 1 As shown, it includes an upper mold assembly 1, a lower mold assembly 2, a core mold assembly 3, and a slider assembly 4.

[0024] Upper mold assembly 1 is the upper actuator for concave forming, such as... Figure 2 As shown, it includes: Upper cutting block 11: Its lower end face is formed with a punch surface 102, which is used to extrude the upper side wall of the square tube to form a concave shape; Upper blade block fixing seat 12: The upper blade block 11 is embedded and fixed in it, which serves to position and fix it; Upper pad 13: The upper blade block fixing seat 12 is fixed to its lower end face by bolts, and is used to bear and distribute pressure; Upper mold base 14: The upper pad 13 is fixed to its lower end face, serving as the base of the upper mold assembly, and is fixed to the lifting pressure head of the press during operation.

[0025] The lower mold assembly 2 is the lower support and actuator for concave forming, such as... Figure 3 As shown, it includes: Lower cutting block 21: Its upper end face is also formed with a punch surface 102, which is used to extrude the lower side wall of the square tube to form a concave shape; Lower cutter block fixing seat 22: The lower cutter block 21 is embedded and fixed therein; Lower pad 23: The lower blade block fixing seat 22 is fixed to it by bolts, and plays the role of bearing and dispersing pressure; Lower mold base 24: The lower pad 23 is fixed on it and serves as the base of the lower mold assembly; Lower die feet 25: Multiple lower die feet 25 are fixed to the bottom of the lower die base 24 to support the mold as a whole and provide a mounting reference for the press.

[0026] The core mold assembly 3 is located between the upper cutting block 11 and the lower cutting block 21, and is used for internal forming of the square tube, such as... Figure 4 As shown, it includes: Core mold base 31: Located on the lower mold base 24, it serves as the mounting base for the core mold assembly; Core template 32: A pair of core templates 32 are symmetrically arranged and fixed on the core mold base 31, and a wedge-shaped groove 33 is formed between the two core templates 32; in the open mold state, the core mold composed of the two core templates 32 is wedge-shaped, which makes it easy for the square tube to be inserted. Die groove 34: Formed on the outer side of the core template 32, corresponding to the punch surface 102 of the upper die block 11 and the lower die block 21, together forming a concave cavity.

[0027] Slider assembly 4 is used to drive the core template 32 to open, including: Wedge-shaped slider 41: inserted into the wedge-shaped groove 33; Arc-shaped end 45: Formed at the end of the wedge-shaped slider 41 away from the drive end, reducing the resistance when extruding the core template 32; Push-pull block 42: fixed to the outer end of wedge-shaped slider 41; Cylinder 43: Its piston rod end is fixed to the push-pull block 42, and it is connected to a high-pressure air source through an air pipe and a solenoid valve. The solenoid valve is electrically connected to the controller to realize the extension and retraction control of the wedge slider 41. Support 44: Cylinder 43 is fixed on it, and support 44 is fixed on core mold base 31 to ensure driving stability.

[0028] like Figure 5 As shown, the core template 32 includes an integrally formed rectangular block 321 and a gradually elongated module 322. The rectangular block 321 is fixed on the core mold base 31, and the two rectangular blocks 321 are attached to each other to ensure their relative positions. The wall thickness of the gradually elongated module 322 increases at the end away from the rectangular block 321, while the wall thickness is smaller at the end closer to the rectangular block 321, which facilitates the expansion and deformation when the wedge-shaped slider is squeezed.

[0029] The wedge-shaped slider 41 includes a rectangular segment 411 and a wedge-shaped segment 412; a guide groove 323 is formed on the rectangular block 321, and the guide grooves 323 of the two rectangular blocks 321 together form a guide hole, which is used to guide the rectangular segment 411 and ensure the stability of movement; the wedge-shaped segment 412 is used to squeeze the wedge-shaped groove 33 to open the two core templates 32.

[0030] like Figure 2 , Figure 3 As shown, multiple guide pins 26 and limiting pins 27 are fixed on the lower mold base 24, and corresponding guide sleeves 15 are fixed on the upper mold base 14. When the upper mold moves down, the guide sleeves 15 fit into the guide pins 26 to ensure mold closing accuracy. When the upper mold base 14 moves down to the bottom surface abutting the top of the limiting pin 27, it restricts the upper mold from moving further down to avoid excessive pressure.

[0031] Two side mold posts 101 are formed on the upper cutter block 11 and the lower cutter block 21, respectively located at both ends of the punch surface 102: the side mold posts 101 of the lower cutter block 21 are used for lateral positioning when the square tube is inserted to prevent displacement; after the mold is closed, the upper and lower side mold posts 101 are attached to the side wall of the square tube to limit its lateral deformation.

[0032] like Figure 6 As shown, the core mold base 31 is fixed to the piston rod of the nitrogen cylinder 36 through multiple connecting seats 35. The nitrogen cylinder 36 is fixed to the lower mold base 24, so that the core mold base 31 is in a flexible floating state. During pressing, the core mold base, core template and wedge slider can move slightly downward with the mold closing action to improve the molding quality. The step rod 37 is fixed on the lower mold base 24, and its upper part is sleeved in the step hole of the core mold base 31, limiting the upward movement of the core mold base 31.

[0033] Work process Clamping and positioning: Insert the end of the square tube 9 that needs to be pressed into the two core templates 32. The controller controls the piston rod of the cylinder 43 to extend, pushing the wedge slider 41 into the wedge groove 33, so that the two core templates 32 are opened and attached to the inner wall of the square tube. The core mold changes from a wedge shape to a square column shape.

[0034] Mold closing and forming: The press drives the upper mold assembly 1 to move down, and the guide sleeve 15 is guided along the guide post 26; the upper cutter block 11 and the cavity groove 34 of the upper core template 32, and the lower cutter block 21 and the cavity groove 34 of the lower core template 32 respectively form concave cavities, and the corresponding parts of the upper and lower side walls of the square tube are squeezed to form concave cavities; during this process, the core mold base 31 moves down slightly as the core template is pressed down, and the side mold post 101 restricts the lateral deformation of the square tube.

[0035] Mold opening and part removal: After the concave molding is completed, the press drives the upper mold assembly 1 to move upward, the piston rod of the cylinder 43 retracts, the wedge slider 41 exits the wedge groove 33, the two core templates 32 move closer to each other and reset to separate from the square tube concave mold, and the square tube is taken out.

[0036] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model. These improvements and modifications assumed above should also be considered within the protection scope of the present utility model.

Claims

1. A cold-pressing mold for forming a square tube concave shape, comprising an upper mold assembly (1), a lower mold assembly (2), and a slider assembly (4), characterized in that: The upper mold assembly (1) includes an upper cutting block (11); The lower die assembly (2) includes a lower cutting block (21) and a lower die base (24). A core mold assembly (3) is provided between the upper cutting block (11) and the lower cutting block (21). The core mold assembly (3) includes a core mold base (31) disposed on the lower mold base (24), and a pair of core mold plates (32) symmetrically arranged vertically are fixed on the core mold base (31). A wedge-shaped groove (33) is formed between the two core mold plates (32). The core mold composed of the two core mold plates (32) is wedge-shaped in the mold opening state. A cavity groove (34) is formed on the core mold plate (32), and a punch surface (102) corresponding to the cavity groove (34) is formed on the upper cutter block (11) and the lower cutter block (21). The slider assembly (4) includes a wedge slider (41) fitted into a wedge groove (33).

2. The square tube concave cold pressing forming mold according to claim 1, characterized in that: The outer end of the wedge-shaped slider (41) is fixed on the push-pull block (42), the push-pull block (42) is fixed on the piston rod end of the cylinder (43), the cylinder (43) is fixed on the bracket (44), and the bracket (44) is fixed on the core mold base (31).

3. The square tube concave cold pressing forming mold according to claim 2, characterized in that: The wedge-shaped slider (41) has an arc-shaped end (45) at the end away from the cylinder (43).

4. The square tube concave cold pressing forming mold according to claim 1, characterized in that: The core template (32) includes an integrally formed rectangular block (321) and a gradually lengthening module (322). The wall thickness of the gradually lengthening module (322) is greater the further away from the rectangular block (321). The rectangular blocks (321) of the two core templates (32) are attached together.

5. The square tube concave cold pressing forming mold according to claim 4, characterized in that: The wedge-shaped slider (41) includes a rectangular segment (411) and a wedge-shaped segment (412). The rectangular block (321) has a guide groove (323) formed on it, and the rectangular segment (411) is inserted into the guide hole formed by the guide grooves (323) of the two rectangular blocks (321).

6. The square tube concave cold pressing forming mold according to claim 1, characterized in that: The lower mold base (24) is fixed with multiple guide posts (26) and limit posts (27). A guide sleeve (15) that cooperates with the guide post (26) is fixed on the upper mold base (14).

7. The square tube concave cold pressing forming mold according to claim 1, characterized in that: The upper die block (11) and the lower die block (21) each have two side die pillars (101) formed on them, and the two side die pillars (101) are placed at both ends of the punch surface (102).

8. The square tube concave cold pressing forming mold according to claim 1, characterized in that: Multiple connecting seats (35) are fixed on the core mold base (31). The connecting seats (35) are fixed on the piston rod of the nitrogen cylinder (36). The nitrogen cylinder (36) is fixed on the lower mold base (24). The core mold base (31) has multiple stepped holes formed on it, and a stepped rod (37) is sleeved in the stepped hole. The stepped rod (37) is fixed on the lower mold base (24).

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