Search

CN-121972563-A - Metastable state stainless steel multi-bending member progressive die stamping device and method

CN121972563ACN 121972563 ACN121972563 ACN 121972563ACN-121972563-A

Abstract

The invention belongs to the technical field of stamping, and particularly relates to a metastable stainless steel multi-bending member progressive die stamping device and method. The device comprises a base, a blanking unit and a multistage die unit, wherein the blanking unit and the multistage die unit are sequentially arranged on the base, the blanking unit comprises a die assembly, a die locking mechanism and a die locking mechanism, a guide post is arranged on the base, the die assembly and the die assembly are in sliding fit with the guide post, the die assembly is used for pressing progressive die stamping and cutting metal plates, the die assembly is used for blanking progressive die stamping and cutting metal plates, the die locking mechanism and the die locking mechanism are respectively arranged on two sides of the base, the die locking mechanism is used for locking the die assembly, and the multistage die unit is used for sequentially carrying out multistage stamping and blanking on the punched parts of the progressive die stamping and cutting metal plates. The invention realizes high-efficiency, low-cost and batch stamping forming of the low-temperature high-toughness thin-wall multi-bending member, and the formed member does not need subsequent heat treatment annealing.

Inventors

  • SUN JINPING
  • SUN XIANGJUN
  • LIU KANG
  • TANG XIAOFEI
  • CONG RIHUI

Assignees

  • 哈尔滨工业大学（威海）
  • 山东仁鸿精密科技有限公司

Dates

Publication Date
20260505
Application Date
20260318

Claims (10)

  1. 1. The metastable stainless steel multi-bending-member progressive die stamping device is characterized by comprising a base (12), and a blanking unit and a multi-stage die unit which are sequentially arranged on the base (12); The punching unit comprises a die assembly (6), a die assembly (7), a die locking mechanism and a die locking mechanism, wherein a guide column (20) is arranged on the base (12), the die assembly (6) and the die assembly (7) are in sliding fit with the guide column (20), the die assembly (6) is used for pressing a progressive die punching sheet metal (5), and the die assembly (7) is used for punching the progressive die punching sheet metal (5); the stamping die locking mechanism and the stamping die locking mechanism are respectively arranged on two sides of the base (12), the stamping die locking mechanism is used for locking the stamping die assembly (6), the stamping die locking mechanism is used for locking the stamping die assembly (7), and the multistage stamping die unit is used for sequentially carrying out multistage stamping and blanking on the stamping part of the progressive stamping and cutting sheet metal (5).
  2. 2. The metastable stainless steel multi-bend member progressive die stamping device of claim 1, characterized in that the die assembly (6) comprises an upper die (6A) and a lower die (6B); The upper pressing die (6A) and the lower pressing die (6B) are identical in structure and comprise cuboid pressing die plates, two punching grooves (601) are symmetrically formed in the cuboid pressing die plates, the two punching grooves (601) are U-shaped grooves with opposite openings, guide holes I (602) which are in sliding fit with the guide posts (20) are formed in four corners of the cuboid pressing die plates, the inner surfaces, in contact with the progressive die punching and cutting metal plates (5), of the cuboid pressing die plates are planes, and locking taper surfaces (603) are formed in two ends of the outer surfaces.
  3. 3. The metastable stainless steel multi-bend member progressive die stamping device of claim 2, characterized in that the die assembly (7) comprises an upper die (7A) and a lower die (7B); the upper stamping die (7A) and the lower stamping die (7B) are identical in structure and comprise cuboid stamping die plates, punching protruding edges (701) are symmetrically arranged on the inner side surfaces of the cuboid stamping die plates, the punching protruding edges (701) can penetrate through punching grooves (601) in the upper stamping die (6A) and the lower stamping die (6B), inclined guide posts (703) are arranged at two ends of the outer side surfaces of the cuboid stamping die plates, and guide holes II (702) in sliding fit with the guide posts (20) are arranged at four corners of the cuboid stamping die plates.
  4. 4. A metastable stainless steel multi-bending member progressive die stamping device according to claim 3, characterized in that the two punching protruding edges (701) are of a U-shaped structure with opposite openings, and the end faces of the punching protruding edges (701) are provided with decompression grooves (704).
  5. 5. The metastable stainless steel multi-bending member progressive die stamping device according to claim 1, characterized in that the die locking mechanism comprises a die locking seat (21), a die locking block (8) and a die locking hydraulic cylinder (9), wherein the die locking hydraulic cylinder (9) is arranged on the die locking seat (21) and outputs power in the horizontal direction, the die locking block (8) is arranged at the output end of the die locking hydraulic cylinder (9), the die locking block (8) is provided with a V-shaped opening, the die locking hydraulic cylinder (9) drives the die locking block (8) to horizontally feed, and the die locking block (8) locks the die assembly (6) through the V-shaped opening.
  6. 6. The progressive stamping device for the metastable stainless steel multi-bending members according to claim 1, wherein the die locking mechanism comprises a die locking block (10), a die locking hydraulic cylinder (11) and a die locking seat (22), wherein a linear module is arranged in the die locking seat (22) in the vertical direction, the output end of the linear module is connected with the die locking hydraulic cylinder (11), the die locking hydraulic cylinder (11) outputs power in the horizontal direction, the die locking block (10) is connected with the output end of the die locking hydraulic cylinder (11), friction conical surfaces are symmetrically arranged at the upper end and the lower end of the die locking block (10), the die locking block (10) is contacted with the die assembly (7) through the friction conical surfaces at the two ends, and locking or releasing of the die assembly (7) is realized through expansion and contraction of the die locking hydraulic cylinder (11).
  7. 7. The progressive stamping device for the metastable stainless steel multi-bending members according to claim 1, wherein the stamping die unit comprises a lifting column (13), a return spring (14), a swinging rod (15), guide rollers (16), stamping rollers (18), an arc bending tool (19) and a supporting frame (23), wherein the arc bending tool (19) and the supporting frame (23) are arranged on the base (12), the lifting column (13) can be installed at the top of the supporting frame (23) in a vertically sliding mode, the lifting column (13) is connected with the supporting frame (23) through the return spring (14), the bottom of the lifting column (13) is hinged with the upper ends of the two swinging rods (15), torsion springs are arranged to maintain the relative stable positions of the swinging rods (15) and the lifting column (13), the guide rollers (16) and the stamping rollers (18) are respectively arranged at the middle and lower ends of the swinging rods (15), the stamping rollers (18) are located above the arc bending tool (19), when the lifting column (13) descends under the action, the two swinging rods (15) are arranged to contact the guide rollers (17) on the curved surfaces of the two guide rollers (16) respectively, and the two curved surfaces of the stamping rollers (17) are arranged symmetrically.
  8. 8. The metastable stainless steel multi-bending-member progressive die stamping device according to claim 7, wherein the upper edges and the lower edges of the two sides of the bending tool (19) are provided with shaping fillets, and the stamping roller (18) rolls along the shaping fillets of the bending tool (19) to enable the inner side area of a blanking area of the progressive die stamping sheet metal (5) to form bending arc forging (507).
  9. 9. A metastable stainless steel multi-bend member progressive die stamping method based on the apparatus of claim 8, comprising the steps of: Step S1, blanking by a controllable compressive stress closed die, comprising the following steps of: Starting a die locking mechanism to enable the upper die assembly (6) to press the non-blanking area of the progressive die stamping and cutting sheet metal (5); starting a die locking mechanism to enable the die assembly (7) to be tightly locked with a blanking area (506) of the progressive die blanking sheet metal (5); The upper side of the die assembly (7) is beaten by an external punch to finish the blanking of the controllable compressive stress closed die; Resetting the die locking mechanism, unlocking the die assembly (7) and the blanking area (506) of the progressive die stamping sheet metal (5), and removing the sheet metal blocks falling from the blanking area (506); resetting the die locking mechanism, and preparing for the next step blanking; s2, one-stage bending with controllable two sides; S3, bending one side of the controllable second stage; s4, bending the other side of the controllable second stage; And S5, blanking of the controllable compressive stress closed die.
  10. 10. The metastable stainless steel multi-bend member progressive die stamping method of claim 9, wherein in step S2, the two-sided controllable primary bending comprises the steps of: step S2a, progressive die stamping and cutting the metal plate (5) to a bending station in the length direction and positioning; S2b, the punch of the external punch impacts the upper part of the lifting column (13) to enable the punching roller (18) to move downwards to be in contact with the progressive die punching sheet metal (5); S2c, rolling the stamping roller (18) along a shaping fillet of a bending arc tool (19) to enable a metal plate contact area to form bending arc forging (507) in a two-way compressive stress plastic state; And S2d, resetting the punch head of the external punching machine, and recovering the punching roller (18) to an initial stable position under the action of a reset spring (14).

Description

Metastable state stainless steel multi-bending member progressive die stamping device and method Technical Field The invention belongs to the technical field of stamping, and particularly relates to a metastable stainless steel multi-bending member progressive die stamping device and method. Background The metastable stainless steel (such as SUS 304) has excellent corrosion resistance, toughness and strength, is widely applied to the fields of aerospace, automobile industry and the like with large environmental temperature difference and corrosion and impact, has the advantages of low cost, high efficiency, good forming quality, good part interchangeability and the like, and is suitable for batch manufacturing of thin plate type multi-bending members. However, the austenite of metastable stainless steel is a metastable structure, when cold stamping forming is carried out at normal temperature, if the strain exceeds the critical value of 20% -30%, martensitic transformation can occur, so that the low-temperature toughness of the material is greatly reduced, the bent part is easy to crack and brittle fracture, the cold stamping of the thin-wall multi-bending component needs to undergo multiple procedures such as twice right-angle bending, curved surface flanging, stretching, punching, inner hole flanging and the like, the stress strain distribution is seriously uneven, and the martensitic transformation structure caused by cold plastic deformation and uneven distribution can lead to unstable component performance and difficult guarantee of the low-temperature toughness. In practical tests, when the member falls down to impact for 3 times in the air at the temperature of minus 50 ℃ and 1.5m, 93% of the bending part is likely to crack, and the low-temperature impact performance qualification rate is extremely low. In the prior art, attempts are made to improve the problems in the prior art by increasing the round angle of a die, optimizing the shape of a blank and the like, but the generation of tensile stress in the stamping process cannot be avoided, and a fold configuration crack source and a tearing configuration crack source can be formed by coupling the tensile stress and the compressive stress. As shown in figures 1 and 2 of the drawings, As shown in fig. 1 and 2, in the prior art, a sheet metal 3 between a punch 1 and a lower die 2 is bent into a member 4, and in fig. 1, when a die gap is too large, the die gap is too small, and the sheet metal is blanked. The concave angle surface 401 of the component can form a fold configuration crack source of compressive strain, the convex angle surface 402 of the component can form a tearing configuration crack source of tensile strain, the residual stress is higher, the martensitic transformation can not be effectively controlled within a critical value, and the problem of low-temperature cracking of the component is not fundamentally solved. Therefore, a brand new stamping device and method are urgently needed, improvement is carried out on the type of stamping stress and the forming process, the tensile stress is prevented from participating in the forming process, the martensitic transformation degree is controlled, the low-temperature toughness of the metastable stainless steel multi-bending member is improved, and efficient batch manufacturing of the metastable stainless steel multi-bending member is achieved. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a progressive die stamping device and method for a metastable stainless steel multi-bending member, which are used for solving the technical problems of excessive martensitic transformation, poor low-temperature toughness and easy cracking of bending parts of the metastable stainless steel after cold plastic deformation, realizing high-efficiency, low-cost and batch stamping forming of the low-temperature high-toughness thin-wall multi-bending member, and forming members do not need subsequent heat treatment annealing. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention provides a metastable stainless steel multi-bending-member progressive die stamping device, which comprises a base, and a blanking unit and a multi-stage die unit which are sequentially arranged on the base; The punching unit comprises a die assembly, a die locking mechanism and a die locking mechanism, wherein a guide post is arranged on the base, the die assembly and the die assembly are in sliding fit with the guide post, the die assembly is used for pressing a progressive die punching sheet metal, and the die assembly is used for punching the progressive die punching sheet metal; The stamping die locking mechanism and the stamping die locking mechanism are respectively arranged on two sides of the base, the stamping die locking mechanism is used for locking the stamping die assembly, and the multistage stamping die unit is used for sequ