Anti-fold forming system for a lug forging based on a havert molded blank

Abstract

The utility model discloses a lifting ring forge piece anti -folding forming system based on harver die blank belongs to metal forging press forming field, including harver die pre -forging system, lifting ring finish forging mould, lifting ring trimming die and lifting ring piercing die, the harver die pre -forging system is the new core unit, lifting ring finish forging mould, lifting ring trimming die and lifting ring piercing die use the general die of existing lifting ring forging process, the harver die pre -forging system includes upper die group and lower die group, the asymmetric volume partition type cavity system is formed in the lower die group inside, the asymmetric volume partition type cavity system includes central gathering cavity, ring arm shunt cavity and streamline optimization transition area, through the structural design of asymmetric volume partition type cavity system, cooperate with the backflow blocking effect of process boss, completely eradicated the folding defect of ring body in -side R angle in traditional process, and metal streamline is continuous lamellar distribution, eliminates stress concentration, has improved the fatigue strength and impact toughness of forge piece significantly.

Description

Technical Field

[0001] This utility model belongs to the field of metal forging and forming technology, specifically relating to an anti-folding forming system for lifting ring forgings based on Haver die blanking. Background Technology

[0002] The existing forming process of lifting ring forgings mainly includes three stages: billet pretreatment, main body forming, and post-treatment. In the billet pretreatment stage, a circular cross-section bar is induction heated, then radially compressed using a general upsetting machine and axially flattened using a flat anvil. The flattened billet is then transferred to the final forging die cavity to form the geometric contour of the lifting ring in a closed mold. Finally, the circumferential flash is removed by a punch press and the center hole is cut off to complete the processing.

[0003] However, this traditional process has significant technical defects. The flattening process easily leads to uneven distribution of material elongation, resulting in localized material accumulation in the transition area. During the final forging process, the accumulated material and the main flowing metal undergo shear interference, forming a through fold at the inner R-corner of the ring. Moreover, the depth of the fold gap often exceeds the surface machining allowance, and the zinc plating layer cannot completely cover the defective area. During service, the residual medium will continue to corrode the substrate, resulting in irreversible mottled discoloration on the surface. At the same time, defective products need to be repaired by high-temperature annealing, which will cause grain coarsening and affect mechanical properties. Some severely defective parts are directly scrapped, which not only reduces the overall utilization rate of materials but also increases energy consumption and labor costs, making it difficult to meet the manufacturing requirements of load-bearing components with high safety standards. Utility Model Content

[0004] The purpose of this invention is to provide an anti-folding forming system for lifting ring forgings based on Haval die blanks, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a folding-resistant forming system for lifting ring forgings based on Haver die blanking, comprising a Haver die pre-forging system, a lifting ring final forging die, a lifting ring trimming die, and a lifting ring punching die. The Haver die pre-forging system is a newly added core unit, while the lifting ring final forging die, lifting ring trimming die, and lifting ring punching die use the common molds of the existing lifting ring forging process.

[0006] The Haval die pre-forging system includes an upper die assembly and a lower die assembly, with the lower die assembly forming an asymmetric volumetric cavity system.

[0007] The above technical solution achieves directional distribution and orderly flow of metal through an asymmetric volume integral region cavity system, fundamentally solving the folding defects caused by material accumulation and shear interference in traditional processes, while ensuring the dimensional accuracy and mechanical properties of forgings, and improving production economy and process adaptability.

[0008] In a preferred embodiment, the asymmetric volumetric cavity system includes a central focusing cavity, a ring arm splitting cavity, and a streamlined transition zone, wherein the streamlined transition zone is used to connect the central focusing cavity and the ring arm splitting cavity.

[0009] Through the above technical solution, the connection effect of the streamlined transition zone is utilized to form a continuous cavity channel between the central gathering cavity and the ring arm distribution cavity, guiding the orderly flow of high-temperature plastic metal, avoiding turbulence and shear interference caused by abrupt changes in the flow path, and facilitating subsequent precise metal distribution.

[0010] In a preferred embodiment, the asymmetric volumetric cavity system enables the pre-forging process to form a preform with process bosses. The process bosses are used to block the metal backflow path during the final forging stage. The ring arm diversion cavity is used to distribute the metal volume differently according to the structural characteristics of the lifting ring. The central accumulation cavity is used to absorb excess metal material.

[0011] Through the above technical solutions, the process boss formed in the pre-forging stage can physically block the metal backflow during the final forging, completely eliminating the R-angle folding defect inside the ring body. At the same time, the ring arm diversion cavity accurately distributes metal according to the lifting ring structure to ensure the forming requirements of the main body. The central accumulation cavity absorbs excess metal to avoid material accumulation, realizing the forming logic of "priority filling of the main body and buffering of excess metal".

[0012] In a preferred embodiment, the ring arm diversion cavity includes an upper extension area and a main distribution area, and the streamlined transition area includes a first arc-shaped transition area and a second arc-shaped transition area. The first arc-shaped transition area connects the main distribution area and the central collection cavity, and the second arc-shaped transition area connects the upper extension area and the main distribution area.

[0013] The above technical solution adopts an arc-shaped transition zone design to further reduce metal flow resistance, allowing the metal to transition smoothly between various cavity areas. At the same time, the ring arm distribution cavity is divided into an upper extension area and a main distribution area, which more accurately matches the structural characteristics of the lifting ring arm and ensures the compatibility between the pre-forged billet and the final forging cavity.

[0014] In a preferred embodiment, the bottom shape of the upper module is precisely matched to the contour of the ring arm diversion cavity, and the upper module can descend into the upper extension area of ​​the ring arm diversion cavity.

[0015] Through the above technical solution, the precise matching and downward entry design of the upper module and the ring arm diversion cavity can apply directional pressure to the billet, force the metal to flow along the cavity path, ensure that the ring arm diversion cavity is fully filled, and at the same time ensure the geometric accuracy of the pre-forged billet, providing high-quality preforms for final forging.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. The anti-folding forming system for lifting ring forgings based on Haval mold blanks, through the structural design of the asymmetric volume integral region cavity system, combined with the backflow blocking effect of the process boss, completely eliminates the folding defect of the inner R angle of the ring body in the traditional process. At the same time, the metal flow lines are distributed in a continuous layer, eliminating stress concentration, significantly improving the fatigue strength and impact toughness of the forging, and ensuring the quality stability and service safety of the lifting ring forgings.

[0018] 2. This anti-folding forming system for lifting ring forgings based on Haval die blanking significantly reduces the production line transformation cost by using the existing lifting ring final forging die, lifting ring trimming die, and lifting ring punching die, and only adding a Haval die pre-forging system. At the same time, it eliminates the upsetting and flattening process in the traditional process, shortens the production cycle, reduces equipment occupation and energy consumption, avoids material waste caused by rework and scrap, and improves the comprehensive utilization rate of materials. Attached Figure Description

[0019] Figure 1 This is a frontal cross-sectional view of the present invention.

[0020] In the diagram: 1. Haval die pre-forging system; 11. Upper die assembly; 12. Lower die assembly; 13. Asymmetric volume integral area cavity system; 131. Central gathering cavity; 132. Ring arm diversion cavity; 1321. Upper extension area; 1322. Main distribution area; 133. Streamline optimization transition area; 1331. First arc-shaped transition area; 1332. Second arc-shaped transition area. Detailed Implementation

[0021] The present invention will be further described below with reference to the embodiments.

[0022] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0023] Please see Figure 1 This utility model provides a folding prevention forming system for lifting ring forgings based on Haval die blanking, including a Haval die pre-forging system 1, a lifting ring final forging die, a lifting ring trimming die, and a lifting ring punching die. The Haval die pre-forging system 1 is a newly added core unit, while the lifting ring final forging die, lifting ring trimming die, and lifting ring punching die use the common molds of the existing lifting ring forging process.

[0024] Furthermore, the Haval die pre-forging system 1 includes an upper die assembly 11 and a lower die assembly 12. The lower die assembly 12 internally forms an asymmetric volumetric cavity system 13, which includes a central concentrating cavity 131, a ring-arm diverting cavity 132, and a streamlined transition zone 133. The streamlined transition zone 133 connects the central concentrating cavity 131 and the ring-arm diverting cavity 132. Through the connecting effect of the streamlined transition zone 133, the central concentrating cavity 131 and the ring-arm diverting cavity 132 form a continuous cavity channel, guiding the orderly flow of high-temperature ductile metal and avoiding turbulence and shear interference caused by abrupt changes in the flow path, thus facilitating subsequent precise metal distribution.

[0025] Furthermore, the ring arm flow divider 132 includes an upper extension area 1321 and a main distribution area 1322, and the streamlined transition area 133 includes a first arc-shaped transition area 1331 and a second arc-shaped transition area 1332. The first arc-shaped transition area 1331 connects the main distribution area 1322 and the central gathering cavity 131, and the second arc-shaped transition area 1332 connects the upper extension area 1321 and the main distribution area 1322. The design of the arc-shaped transition area further reduces the metal flow resistance, allowing the metal to transition smoothly between the cavity areas. At the same time, dividing the ring arm flow divider 132 into the upper extension area 1321 and the main distribution area 1322 more accurately matches the structural characteristics of the lifting ring arm, ensuring the compatibility between the pre-forged billet and the final forging cavity.

[0026] Furthermore, the bottom shape of the upper module 11 is precisely matched with the contour of the ring arm diversion cavity 132. The upper module 11 can descend into the upper extension area 1321 of the ring arm diversion cavity 132. The precise matching and downward entry design of the upper module 11 and the ring arm diversion cavity 132 can apply directional pressure to the billet, force the metal to flow along the cavity path, ensure that the ring arm diversion cavity 132 is fully filled, and at the same time ensure the geometric accuracy of the pre-forged billet, providing a high-quality preform for final forging.

[0027] Furthermore, the asymmetric volumetric cavity system 13 enables the pre-forging process to form a preform with process bosses. The process bosses are used to block the metal backflow path during the final forging stage. The ring arm diversion cavity 132 is used to distribute the metal volume differently according to the structural characteristics of the lifting ring. The central accumulation cavity 131 is used to absorb excess metal material. The process boss is a raised structure synchronously formed by the asymmetric volume integral region cavity system 13 during the pre-forging stage. Its position precisely corresponds to the channel near the inner R-angle of the ring body where metal is prone to backflow during the final forging. Its size is adapted to the cavity wall of the final forging model and has sufficient structural strength. When the metal fills the main body cavity of the lifting ring in the forward direction during the final forging stage, the boss does not cause interference. When the main body cavity is filled and excess metal attempts to flow back in the reverse direction, the boss will form a rigid barrier through physical occupation, directly cutting off the key channel of metal backflow, avoiding the collision between the reverse backflow metal and the forward flow metal, thereby completely blocking the metal backflow path and eliminating the folding defect at the inner R-angle of the ring body. The ring arm diversion cavity 132 accurately distributes metal according to the lifting ring structure to ensure the forming requirements of the main body. The central accumulation cavity 131 absorbs excess metal and avoids material accumulation, realizing the forming logic of "priority filling of the main body and buffering of excess metal".

[0028] The working principle of this utility model is as follows: When in use, the circular cross-section bar is induction heated to the forgeable temperature range and then placed on the lower die 12. The forging equipment drives the upper die 11 to move downward. Since the bottom shape of the upper die 11 is precisely matched with the contour of the ring arm diversion cavity 132, the upper die 11 gradually enters the upper extension area 1321 of the ring arm diversion cavity 132 during the downward movement and applies downward pressure to the billet.

[0029] Under pressure, the high-temperature ductile metal flows along the second arc-shaped transition zone 1332 to the main distribution zone 1322. The ring arm distribution cavity 132 distributes the metal volume differently according to the structural characteristics of the lifting ring, and preferentially fills the cavity area corresponding to the ring arm of the lifting ring. When the ring arm distribution cavity 132 is completely filled, the excess metal flows into the central accumulation cavity 131 through the first arc-shaped transition zone 1331 for temporary storage. During this process, the streamlined transition zone 133 effectively guides the orderly flow of metal and avoids turbulence and shear interference. At the same time, the asymmetric volume integral cavity system 13 enables the pre-forging to form a preform with process bosses.

[0030] The pre-forged process boss is then transferred to the final forging die of the lifting ring. The geometric contour of the lifting ring is formed in the closed die. At this time, the process boss precisely occupies the metal return channel, blocking the collision between the reverse flow metal and the forward metal. During the final forging process, the process boss physically blocks the metal return path, completely avoiding the formation of folding defects in the inner R-angle of the ring. Finally, the circumferential flash is removed by the lifting ring trimming die, and the center hole is removed by the lifting ring punching die, completing the overall processing of the lifting ring forging.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lifting ring forging anti-folding forming system based on Haval die-casting, characterized in that: It includes a Haval pre-forging system (1), a lifting ring final forging die, a lifting ring trimming die, and a lifting ring punching die. The Haval pre-forging system (1) is a newly added core unit. The lifting ring final forging die, the lifting ring trimming die, and the lifting ring punching die use the common molds of the existing lifting ring forging process. The Haval die pre-forging system (1) includes an upper die group (11) and a lower die group (12), and the lower die group (12) forms an asymmetric volume integral region cavity system (13).

2. The anti-folding forming system for lifting ring forgings based on Haver die blanks according to claim 1, characterized in that: The asymmetric volumetric cavity system (13) includes a central convergence cavity (131), a ring arm splitter cavity (132), and a streamlined transition zone (133). The streamlined transition zone (133) is used to connect the central convergence cavity (131) and the ring arm splitter cavity (132).

3. The anti-folding forming system for lifting ring forgings based on Haver die blanks according to claim 2, characterized in that: The asymmetric volumetric cavity system (13) enables the pre-forging process to form a preform with process bosses, which are used to block the metal backflow path during the final forging stage. The ring arm diversion cavity (132) is used to distribute the metal volume differently according to the structural characteristics of the lifting ring. The central accumulation cavity (131) is used to absorb excess metal material.

4. The anti-folding forming system for lifting ring forgings based on Haver die blanking according to claim 2, characterized in that: The ring arm diversion cavity (132) includes an upper extension area (1321) and a main distribution area (1322). The streamlined optimization transition area (133) includes a first arc-shaped transition area (1331) and a second arc-shaped transition area (1332). The first arc-shaped transition area (1331) connects the main distribution area (1322) and the central collection cavity (131). The second arc-shaped transition area (1332) connects the upper extension area (1321) and the main distribution area (1322).

5. The anti-folding forming system for lifting ring forgings based on Haver die blanks according to claim 4, characterized in that: The bottom shape of the upper module (11) is precisely matched with the contour of the ring arm diversion cavity (132), and the upper module (11) can descend into the upper extension area (1321) of the ring arm diversion cavity (132).

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