Pre-forging die for double fork arms
By using vertically arranged pre-forging dies, the problems of high tonnage and low material utilization in existing forging equipment are solved, thereby reducing material and equipment costs, improving metal flow structure properties and production efficiency, and resulting in product quality superior to traditional processes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO PREMIUM AUTOMOTIVE PARTS
- Filing Date
- 2025-05-27
- Publication Date
- 2026-05-01
AI Technical Summary
The transverse arrangement of the cavity in existing pre-forging dies results in high tonnage requirements for forging equipment, low material utilization, large material consumption, and high equipment and material costs. Furthermore, transverse forging is not conducive to metal flow and has low efficiency.
The pre-forging die is arranged vertically, including an upper die mechanism and a lower die mechanism. The pressure head and the main chamber are designed to be longitudinally distributed. After the billet is vertically positioned, it is forged into a Y-shaped workpiece by vertical forging by the pressure head, which reduces the tonnage requirement of the forging equipment and improves the material utilization rate and the metal flow structure properties.
It reduces the tonnage requirement of forging equipment, increases material utilization by 30-40%, reduces material consumption, improves overall mechanical performance and production efficiency, significantly reduces equipment and material costs, and improves product quality.
Smart Images
Figure CN224181986U_ABST
Abstract
Description
Pre-forging die for double wishbone Technical Field
[0001] This utility model relates to the field of automotive parts forging technology, specifically a pre-forging mold for a double wishbone air spring for automobiles. Background Technology
[0002] Forging is a processing method that uses forging machinery to apply pressure to a metal billet, causing it to undergo plastic deformation to obtain forgings with specific mechanical properties, shapes, and dimensions. Forging can improve the mechanical properties of workpieces; therefore, many important parts in machinery that are subject to high loads and harsh working conditions are manufactured using forging. For example, the double wishbone of an air spring in the automotive parts industry generally requires forging processes such as pre-forging and final forging. This application only relates to the pre-forging die for the double wishbone of an air spring.
[0003] The cavity of the existing pre-forging die is arranged horizontally. Therefore, the existing pre-forging process is also horizontal forging, that is, the strip billet is laid horizontally and then forged downwards, with the forging direction perpendicular to the length direction of the workpiece. This will produce a series of defects.
[0004] First, it requires high-tonnage for forging equipment, necessitating large forging equipment of 2500t or more, resulting in high equipment costs. Moreover, the metal deformation resistance of the workpiece is large during the transverse forging process, making it difficult to control the workpiece size, resulting in low material utilization and high material consumption, leading to high material costs. Furthermore, transverse forging is not conducive to metal flow lines, resulting in insufficient comprehensive mechanical properties of the transverse fibrous structure of the forged workpiece. In addition, transverse forging requires at least two passes to complete the pre-forging, which is inefficient. Summary of the Invention
[0005] The technical problem to be solved by this utility model is to provide a double forging die that can reduce the tonnage requirements of forging equipment, improve material utilization, and facilitate the flow of metal in forgings.
[0006] The technical solution of this utility model is to provide a double-forked pre-forging die, which includes an upper die mechanism and a lower die mechanism. The upper die mechanism is connected to the forging equipment and has a downwardly protruding pressure head. The lower die mechanism includes an upward-opening main chamber, and the pressure head is a longitudinally distributed strip-shaped object with an arc-shaped transition angle at the lower end of the pressure head. The main chamber is a longitudinally distributed strip-shaped chamber, and the pressure head is located in the middle of the width of the main chamber and the width of the pressure head is smaller than the width of the main chamber. The lower end of the main chamber has a constriction part for clamping the lower end of the strip-shaped billet.
[0007] Compared with existing technologies, the pre-forging die with the above-mentioned double fork arm structure has the following advantages.
[0008] The working process of this pre-forging die is divided into four stages;
[0009] 1. Place the strip-shaped billet vertically into the main chamber, start the forging equipment, so that the pressure head presses down on the top of the billet, while the lower end of the billet is stuck in the closing part of the main chamber, so as to achieve vertical centering of the billet;
[0010] 2. Press down the pressure head to press the lower end of the billet into the closing part of the main cavity and compact it completely;
[0011] 3. The pressure head continues to press down, causing the billet to expand laterally outward, thereby adhering to the side walls of the main chamber;
[0012] 4. As the pressure head presses down further, the billet, after expanding outwards, is already in contact with the side walls of the main chamber, leaving no room for further outward expansion. It can only begin to be extruded upwards. Specifically, since the pressure head is centered and narrower than the main chamber, two channels are formed between the pressure head and the left and right side walls of the main chamber. Further pressing down the pressure head will cause the outwardly expanded parts on the left and right sides of the workpiece to begin to be extruded upwards along the two channels, thus forming a Y-shaped workpiece and completing the pre-forging.
[0013] Because the pre-forging of the mold in this application, i.e., pressing down the strip-shaped billet to expand it outward and extrude it upward to form a Y-shaped workpiece, belongs to vertical forging. The workpiece is vertical, and the forging direction is also vertical, consistent with the length direction of the workpiece. In this way, the tonnage requirement of the forging equipment can be greatly reduced, and only a small forging press of 500-700t is needed, eliminating the need and cost of equipping large equipment. Moreover, vertical forging effectively reduces the metal deformation resistance, can better control the workpiece size, significantly improves material utilization, and reduces material consumption, with an actual material consumption rate improvement of 30-40%. Furthermore, vertical forging produces better metal flow lines, and the longitudinal fiber structure of the forged workpiece is better than that of the transverse fiber structure, resulting in higher overall mechanical strength. In addition, longitudinal initial forging can be formed in one step, which is more efficient. In summary, both material and equipment costs are significantly reduced. Compared with the original process, the products forged using the equipment in this application have a significant price advantage and better quality.
[0014] Preferably, the lower die mechanism includes a base and a fixed die core fixed on the base. A die-closing drive cylinder is installed on the base in the front-rear direction. The piston rod of the die-closing drive cylinder is connected to a moving die core. A rear chamber is provided in front of the moving die core, and a front chamber is provided in front of the fixed die core. When the die-closing drive cylinder drives the moving die core to abut against the fixed die core, the front chamber and the rear chamber close to form the main chamber. In other words, the main chamber is formed by the closure of the front and rear half chambers. After the initial forging is completed, the die-closing drive cylinder is reversed to drive the moving die core to retract, so that the initial forged workpiece can be easily demolded.
[0015] As a further preferred option, a mold-locking drive cylinder is provided on each of the left and right sides of the base. The piston rod of each mold-locking drive cylinder is connected to a C-shaped locking block. When the moving mold core abuts against the fixed mold core to close the mold, the two mold-locking drive cylinders drive the two C-shaped locking blocks to abut against each other and close, thereby locking the moving mold core to prevent it from retracting. In this way, when the mold is closed, the two mold-locking drive cylinders drive the two C-shaped locking blocks to close against each other, locking the retraction path of the moving mold core, thereby locking the moving mold core and ensuring that the main cavity is sufficient to bear the huge load of pre-forging and improving the stability of the mold.
[0016] As a further optimization, the upper die mechanism has an upper chamber with an opening facing downwards. The lower opening of the upper chamber is the same width as the upper opening of the main chamber, and the top of the pressure head is fixed to the top plate of the upper chamber. In this way, two channels are formed between the pressure head and the left and right side walls of the upper die cavity. The left and right channels of the upper die cavity serve as the upper extensions of the left and right channels of the main chamber, providing space for the left and right bifurcated sections at the upper end of the workpiece to continue to be extruded upwards. This ensures that the length of the left and right bifurcated sections of the Y-shaped workpiece formed in the initial forging meets the design requirements and avoids the situation of uneven lengths. Moreover, placing the upper section of the extrusion channel inside the upper die mechanism can effectively shorten the downward stroke of the upper die mechanism and the pressure head, reduce the stroke requirements of the forging equipment, and also shorten the height of the lower die mechanism. Furthermore, dividing the initial forging cavity into three parts—upper chamber, front chamber, and rear chamber—makes demolding easier. Attached Figure Description
[0017] Figure 1 is a schematic diagram of the pre-forging mold of the double fork arm of this utility model.
[0018] Figure 2 is a schematic diagram of the structure after Figure 1 is deflected by a certain angle.
[0019] Figure 3 is a schematic diagram of the pre-forging mold of the double fork arm of this utility model after removing the upper mold mechanism and the upper part of the base.
[0020] Figure 4 is a schematic diagram of the structure of the fixed mold core of the pre-forging mold of the double fork arm of this utility model.
[0021] Figure 5 is a schematic diagram of the Y-shaped workpiece of the pre-forging mold of the double fork arm of this utility model.
[0022] Figure 6 is a schematic diagram of the upper mold mechanism of the pre-forging mold of the double fork arm of this utility model.
[0023] Figure 7 is a schematic diagram of the structure after removing the fixed mold core from Figure 3.
[0024] Figure 8 is a schematic diagram of the structure after Figure 7 is deflected by a certain angle.
[0025] Figure 9 is a cross-sectional view of the pre-forging mold for the double fork arm of this utility model.
[0026] Figure 10 is a schematic diagram of the metal flow lines of a workpiece forged laterally using a pre-forging die with existing technology.
[0027] Figure 11 is a schematic diagram of the metal flow lines of a workpiece vertically forged using the pre-forging die of this application.
[0028] The figure shows: 1. Upper mold mechanism, 2. Pressure head, 2.1. Arc transition angle, 3. Basic channel, 4. Upper extension channel, 5. Closing part, 6. Base, 7. Fixed mold core, 8. Mold closing drive cylinder, 9. Moving mold core, 10. Rear chamber, 11. Front chamber, 12. Mold locking drive cylinder, 13. C-shaped locking block, 14. Through hole, 15. Through hole, 16. Y-shaped workpiece. Detailed Implementation
[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0030] As shown in Figures 1-11, the pre-forging die for the double fork arm of this utility model includes an upper die mechanism 1 and a lower die mechanism. The upper die mechanism 1 is connected to the forging equipment and is provided with a downwardly protruding pressure head 2. The pressure head 2 is a longitudinally distributed strip, and the lower end of the pressure head 2 is provided with an arc transition angle 2.1.
[0031] The lower die mechanism includes an upward-opening main chamber; the main chamber is a longitudinally distributed strip-shaped chamber, with the pressure head 2 positioned in the middle of the main chamber's width, and its width being less than the main chamber's width. This creates two basic reverse extrusion channels 3 between the pressure head 2 and the left and right side walls of the main chamber. The upper die mechanism 1 has a downward-opening upper chamber, the lower opening of which is the same width as the upper opening of the main chamber, with the top of the pressure head 2 fixed to the top plate of the upper chamber. The pressure head 2 is positioned in the middle of the upper chamber's width, and its width is less than the upper chamber's width. This creates two upward-extending reverse extrusion channels 4 between the pressure head 2 and the left and right side walls of the upper chamber.
[0032] The lower end of the main chamber is provided with a closing part 5 for locking the lower end of the strip-shaped blank.
[0033] The lower mold mechanism includes a base 6 and a fixed mold core 7 fixed on the base 6. A mold closing drive cylinder 8 is mounted on the base 6 in the front-to-back direction, that is, the mold closing drive cylinder 8 is installed on the rear side of the base 6, and its extension and retraction direction is front-to-back. The piston rod of the mold closing drive cylinder 8 is connected to a moving mold core 9. The front surface of the moving mold core 9 is provided with a rear chamber 10, and the fixed mold core 7 is provided with a corresponding front chamber 11. Specifically, the fixed mold core 7, viewed from the top, is a rectangular frame structure, including a front plate, two side plates, and a rear plate. The front chamber 11 is located on the rear surface of the front plate of the fixed mold core 7. The moving mold core 9 slides within the rectangular frame structure of the fixed mold core 7 in the front-to-back direction. The piston rod of the mold closing drive cylinder 8 passes through the through hole 15 of the rear plate of the fixed mold core 7 and is fixed to the moving mold core 9.
[0034] When the mold closing drive cylinder 8 drives the moving mold core 9 to abut against the front plate of the fixed mold core 7, the front chamber 11 and the rear chamber 10 close to form the main chamber.
[0035] Each side of the base 6 has a mold-locking drive cylinder 12, and the piston rod of each mold-locking drive cylinder 12 is connected to a C-shaped locking block 13. When the moving mold core 9 abuts against the fixed mold core 7 to close the mold, the two mold-locking drive cylinders 12 drive the two C-shaped locking blocks 13 to abut against each other and close, thereby locking the moving mold core 9 to prevent it from retracting. Both side plates of the fixed mold core 7 are provided with through holes 14. The C-shaped locking blocks 13 pass through the through holes 14 of the side plates of the fixed mold core 7 on the same side, thereby closing with each other to lock the moving mold core 9.
[0036] The pre-forging die longitudinally forges the strip-shaped billet, causing it to expand outward and be extruded back into a Y-shaped workpiece 16.
Claims
1. A two-ram preforming die comprising an upper die assembly and a lower die assembly, the upper die assembly being connected to a forging press and having a downwardly projecting punch, the lower die assembly comprising a main cavity having an upwardly facing opening, characterised in that: The pressure head is a longitudinally distributed strip-shaped object with an arc-shaped transition angle at its lower end; the main chamber is a longitudinally distributed strip-shaped chamber with the pressure head located in the middle of the width of the main chamber and the width of the pressure head being smaller than the width of the main chamber; the lower end of the main chamber is provided with a constriction section for holding the lower end of the strip-shaped blank in place.
2. The two-broached preforming die of claim 1, wherein: The lower mold mechanism includes a base and a fixed mold core fixed on the base. A mold closing drive cylinder is installed on the base in the front-to-back direction. The piston rod of the mold closing drive cylinder is connected to a moving mold core. A rear chamber is provided in front of the moving mold core, and a front chamber is provided in front of the fixed mold core. When the mold closing drive cylinder drives the moving mold core to abut against the fixed mold core, the front chamber and the rear chamber close to form the main chamber.
3. The two-cant preforming die of claim 2 wherein: Each of the left and right sides of the base is equipped with a mold-locking drive cylinder, and the piston rod of each mold-locking drive cylinder is connected to a C-shaped locking block. When the moving mold core abuts against the fixed mold core to close the mold, the two mold-locking drive cylinders drive the two C-shaped locking blocks to abut against each other and close, thereby locking the moving mold core to prevent it from retracting.
4. The pre-forging die for a double wishbone as described in claim 2, characterized in that: The upper mold mechanism has an upper chamber with an opening facing downwards. The lower opening of the upper chamber is the same width as the upper opening of the main chamber, and the top of the pressure head is fixed to the top plate of the upper chamber.