Closed type die for punching anti-collision guardrail

Abstract

The utility model discloses a closed die for crash barrier punching, which comprises an upper die assembly and a lower die assembly, the lower die assembly comprises a lower die seat plate and a lower female die fixedly installed on the lower die seat plate, the upper end of the lower female die extends to form a cantilever part used for extending into a square tube, and the cantilever part is provided with an avoiding hole site; the upper die assembly is provided with a plurality of male dies corresponding to the avoiding hole positions. According to the utility model, the interior of the square tube is effectively supported through the cantilever part, so that the wall plate of the square tube is punched under the supporting action, the punching deformation can be prevented, the loss rate of the square tube caused by punching damage is reduced, the punching planeness is improved, and the incidence rate of punching cracks is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of square tube guardrail punching dies, in particular to a closed die for punching anti-collision guardrails. Background Art

[0002] The crossbeams of crash barriers are typically made from square steel tubes of a certain length, with oblong holes drilled at each end for connection via bolts. The oblong holes are typically punched using a die. Traditional die dies for square steel tube punching are mostly flat. During punching, the square steel tube is placed directly on the die, leaving it suspended in the air without internal support. This can damage the tube during punching, leading to high shearing forces and a high loss rate. Furthermore, the area around the punched hole is relatively flat and prone to cracking, resulting in poor punching quality. Utility Model Content

[0003] The purpose of the utility model is to provide a closed die for punching anti-collision guardrails to solve the problems raised in the above background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A closed mold for punching anti-collision guardrails includes an upper mold assembly and a lower mold assembly. The lower mold assembly includes a lower mold base plate and a lower concave mold fixedly installed on the lower mold base plate. A cantilever portion for extending into a square tube extends from the upper end of the lower concave mold, and an avoidance hole position is opened on the cantilever portion; the upper mold assembly has a plurality of convex molds corresponding to the avoidance hole positions.

[0006] Preferably, the upper die assembly comprises an upper die base plate, an upper pressure plate and an upper punch fixing seat which are stacked and fixed in sequence, and the punch is distributed and embedded in the upper punch fixing seat.

[0007] Preferably, the lower end surface of the upper punch fixing seat is also equipped with a rubber block for fitting on the punch, and the die head of the punch extends out of the lower surface of the rubber block. During the stamping process, the rubber block will contact the square tube, which can play a certain shock-absorbing and buffering role.

[0008] Preferably, it also includes multiple stroke guide components, which include guide posts, guide sleeves and return springs. The lower end of the guide post is fixed to the lower die base plate, the upper end of the guide post is movably inserted in the guide sleeve, the upper end of the guide sleeve is fixed to the upper pressure plate, the return spring is sleeved on the outer periphery of the guide post, the upper end of the return spring is in contact with the guide sleeve, and the lower end of the return spring is in contact with the bottom step of the guide post.

[0009] Preferably, it also includes a stroke limit assembly, which includes a stroke limit column and a stroke limit sleeve. The upper end of the stroke limit column is inserted on the upper pressure plate and locked and fixed by a lock nut sleeve. The lower end of the stroke limit column is movably inserted in the stroke limit sleeve. The lower end of the stroke limit sleeve is inserted and fixed in the lower mold base plate. A limit strip hole is opened on the side wall of the upper end of the stroke limit sleeve. The lower end of the stroke limit column is inserted with a limit rod, and the limit rod is movably fitted in the limit strip hole.

[0010] Preferably, it also includes a side limit block fixedly mounted on the lower die base plate, the side limit block is threadedly fitted with a pair of laterally extending adjusting bolts, and the free ends of the adjusting bolts are used to rest against the outer side wall of the square tube.

[0011] Preferably, an axial limit rib extends from the end of the side limit block, and the axial limit rib is used to abut against the free end of the square tube. The axial limit rib is used to locate the end position of the square tube, thereby determining the hole margin position between the oblong hole to be punched and the end.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. The upper end of the lower die of the utility model is extended with a cantilever portion, which is in an inverted "L" shape as a whole, so that the square tube can be easily mounted on the cantilever portion. The cantilever portion effectively supports the interior of the square tube, so that the wall plate of the square tube can be punched under the support, which can prevent stamping deformation, reduce the loss rate of the square tube due to stamping damage, improve the flatness of the punching, and reduce the incidence of punching cracks;

[0014] 2. The reasonable structural design of the stroke limit assembly can effectively control the stroke of the upper mold assembly, maximize the protection of the mold, and help extend the service life of the mold;

[0015] 3. By adopting the side limit block with reasonable structural design, the stamping range of the mold can be expanded, which can be applied to the positioning and stamping operations of square tubes of various specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of a closed die for punching anti-collision guardrails;

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of an upper die assembly in a closed die for punching anti-collision guardrails;

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of a side limit stop in a closed die for punching anti-collision guardrails;

[0019] Figure 4 This is a schematic diagram of the three-dimensional structure of the lower die assembly of a closed die for punching anti-collision guardrails;

[0020] Figure 5 This is a partially cutaway structural diagram of a closed die for punching holes in a crash barrier;

[0021] Figure 6 A closed die for punching holes in a crash barrier Figure 5 Schematic diagram of the structure from the medium AA perspective.

[0022] In the figure: 100-square tube, 1-upper die assembly, 11-upper die base plate, 12-upper pressure plate, 13-punch fixing seat, 14-punch, 15-rubber block, 2-lower die base plate, 3-stroke guide assembly, 31-guide sleeve, 32-guide column, 33-reset spring, 4-stroke limit assembly, 41-stroke limit column, 42-lock nut sleeve, 43-stroke limit sleeve, 44-limit bar hole, 45-limit rod, 5-lower die, 51-cantilever part, 52-avoidance hole, 6-side limit block seat, 61-axial limit rib, 62-adjusting bolt. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figures 1 to 6 The utility model provides a technical solution: a closed mold for punching anti-collision guardrails, including an upper mold assembly 1 and a lower mold assembly, the lower mold assembly including a lower mold base plate 2 and a lower die 5 fixedly installed on the lower mold base plate 2, the upper end of the lower die 5 extends with a cantilever portion 51 for extending into a square tube 100, and an avoidance hole 62 is opened on the cantilever portion 51; the upper mold assembly 1 has a plurality of punches 14 corresponding to the avoidance holes 62.

[0025] The working principle of the present invention is as follows: a cantilever portion 51 is extended from the upper end of the lower die 5 of the present invention, and the whole is in an inverted "L" shape, which is convenient for fitting the square tube 100 onto the cantilever portion 51. The cantilever portion 51 forms an effective support for the interior of the square tube 100, so that the wall panel of the square tube 100 can be punched under the support, thereby preventing stamping deformation, reducing the loss rate of the square tube 100 due to stamping damage, improving the flatness of the punching, and reducing the incidence of punching cracks.

[0026] As a specific embodiment, the upper die assembly 1 includes an upper die base plate 11, an upper pressure plate 12, and an upper punch holder 13, which are stacked and fixed in sequence. The punches 14 are distributed and embedded in the upper punch holder 13. A set of dies can be embedded with multiple punches 14 through the upper pressure plate 12 and the punch holder 13. The punches 14 are independent of each other and are combined and positioned by the punch holder 13. The multi-punch structure design enables multiple holes to be punched in a single punching operation, which is beneficial for improving punching efficiency. The independent punches 14 can be easily replaced if damaged, reducing mold processing costs.

[0027] Furthermore, a rubber block 15 is mounted on the lower end surface of the upper punch holder 13, which is adapted to fit over the punch 14. The die head of the punch 14 extends beyond the lower surface of the rubber block 15. During the stamping process, the rubber block 15 comes into contact with the square tube 100, providing a certain degree of shock absorption and cushioning, thereby protecting the square tube 100 and the punch 14 and extending their service life.

[0028] As a specific solution, the present invention also includes multiple travel guide assemblies 3, which include guide posts 32, guide sleeves 31, and return springs 33. The lower ends of the guide posts 32 are fixedly inserted into the lower die base plate 2, and the upper ends of the guide posts 32 are movably inserted into the guide sleeves 31. The upper ends of the guide sleeves 31 are fixedly inserted into the upper pressing plate 12. The return springs 33 are sleeved on the outer periphery of the guide posts 32. The upper ends of the return springs 33 contact the guide sleeves 31, and the lower ends of the return springs 33 contact the bottom steps of the guide posts 32. During the pressing process, the return springs 33 can play a certain buffering role, reducing the instantaneous impact force on the upper die assembly 1. After the stamping is completed, the return springs 33 will push the upper die assembly 1 up along the guide posts 32, thereby causing the punch 14 to separate from the lower die 5.

[0029] As a specific solution, the present invention also includes a stroke limit assembly 4, which includes a stroke limit column 41 and a stroke limit sleeve 43. The upper end of the stroke limit column 41 is inserted into the upper pressing plate 12 and is locked and fixed by a lock nut sleeve 42. The lower end of the stroke limit column 41 is movably inserted into the stroke limit sleeve 43. The lower end of the stroke limit sleeve 43 is inserted and fixed in the lower die base plate 2. A limit bar hole 44 is provided on the upper side wall of the stroke limit sleeve 43. The lower end of the stroke limit column 41 is inserted into a limit rod 45, which is movably engaged in the limit bar hole 44. During stamping, the lock nut sleeve 42 will eventually contact the upper end of the stroke limit sleeve 43, and the lock nut sleeve 42 will control the downward stroke, limit the minimum height of the upper die assembly 1, and prevent the cantilever part 51 from being damaged by excessive force; during upward movement, the upward stroke is controlled by the cooperation between the limit rod 45 and the limit bar hole 44, limiting the maximum stroke of the upper die assembly 1 and avoiding stroke waste. The setting of the stroke limit assembly 4 can effectively control the stroke of the upper mold assembly 1, maximize the protection of the mold, and help extend the service life of the mold.

[0030] As a specific solution, the present invention further includes a side stop 6 fixedly mounted on the lower die base plate 2. A pair of laterally extending adjustment bolts 62 are threadedly mounted on the side stop 6. The free ends of the adjustment bolts 62 are configured to abut against the outer wall of the square tube 100. Furthermore, an axial limit rib 61 extends from the end of the side stop 6. The axial limit rib 61 is configured to abut against the free end of the square tube 100.

[0031] The axial stop 61 positions the end of the square tube 100, thereby determining the distance between the oblong hole to be punched and the end. A pair of adjustment bolts 62 provided on the side stop 6 position the square tube 100 laterally, thereby determining the distance between the oblong hole to be punched and the end. The use of the side stop 6 expands the die's stamping range, making it suitable for positioning and stamping square tubes 100 of various specifications.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A closed die for punching a crash barrier, comprising an upper die assembly (1) and a lower die assembly, characterized in that: The lower die assembly comprises a lower die base plate (2) and a lower die (5) fixedly mounted on the lower die base plate (2); a cantilever portion (51) for extending into the square tube (100) is extended from the upper end of the lower die (5); and an avoidance hole (52) is provided on the cantilever portion (51); The upper die assembly (1) has a plurality of convex dies (14) corresponding to the avoidance hole positions (52).

2. A closed die for punching a crash barrier according to claim 1, characterized in that: The upper die assembly (1) comprises an upper die base plate (11), an upper pressing plate (12) and an upper punch fixing seat (13) which are stacked and fixed in sequence, and the punch (14) is distributed and embedded in the upper punch fixing seat (13).

3. A closed die for punching a crash barrier according to claim 2, characterized in that: The lower end surface of the upper punch fixing seat (13) is also provided with a rubber block (15) for being fitted on the punch (14), and the die head of the punch (14) extends out of the lower surface of the rubber block (15).

4. A closed die for punching a crash barrier according to claim 2, characterized in that: The invention also includes a plurality of travel guide assemblies (3), the travel guide assemblies (3) include guide posts (32), guide sleeves (31) and reset springs (33), the lower ends of the guide posts (32) are fixedly inserted into the lower die base plate (2), the upper ends of the guide posts (32) are movably inserted into the guide sleeves (31), the upper ends of the guide sleeves (31) are fixedly inserted into the upper pressing plate (12), the reset springs (33) are sleeved on the outer periphery of the guide posts (32), the upper ends of the reset springs (33) are in contact with the guide sleeves (31), and the lower ends of the reset springs (33) are in contact with the bottom step of the guide posts (32).

5. The closed die for punching a crash barrier according to claim 2, characterized in that: The invention also includes a stroke limit assembly (4), which includes a stroke limit column (41) and a stroke limit sleeve (43). The upper end of the stroke limit column (41) is inserted into the upper pressure plate (12) and is locked and fixed by a lock nut (42). The lower end of the stroke limit column (41) is movably inserted into the stroke limit sleeve (43). The lower end of the stroke limit sleeve (43) is inserted and fixed in the lower die base plate (2). A limit strip hole (44) is provided on the side wall of the upper end of the stroke limit sleeve (43). A limit rod (45) is inserted into the lower end of the stroke limit column (41), and the limit rod (45) is movably fitted in the limit strip hole (44).

6. A closed die for punching a crash barrier according to any one of claims 1 to 5, characterized in that: The invention also includes a side limit block (6) fixedly mounted on the lower die base plate (2), wherein the side limit block (6) is threadedly fitted with a pair of transversely extending adjustment bolts (62), and the free ends of the adjustment bolts (62) are used to abut against the outer side wall of the square tube (100).

7. A closed die for punching a crash barrier according to claim 6, characterized in that: An axial limiting rib (61) is further extended from the end of the side limiting block seat (6), and the axial limiting rib (61) is used to abut against the free end of the square tube (100).

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