Cross axle frame finish forging die

Abstract

The utility model discloses a cross axle frame final forging die, including corresponding final forging upper die and final forging lower die, be equipped with final forging cavity between final forging upper die bottom surface and final forging lower die top surface, form final forging parting surface between final forging upper die bottom surface and final forging lower die top surface, the annular fly edge storehouse of final forging parting surface upper side is equipped around final forging cavity, the final forging convex column of four prism shape is equipped with in final forging cavity in final forging lower die, and final forging square ring cavity is final forging convex column outside in final forging cavity lower part, and one final forging cylindrical groove is equipped with in final forging cavity front side middle part and rear side middle part, and one triangle convex is equipped with in final forging convex column lower part's front side and rear side. The utility model can realize accurate positioning with the cooperation of the shallow square column hole of pre-forging piece and pre-forging convex column, so that metal material can be full in final forging cavity in the final forging process, and the final forging piece scrap rate is greatly reduced, and the final forging upper die and final forging lower die are balanced in stress when forging, and the service life of the die is long, and the die is convenient to demould after final forging.

Description

Technical Field

[0001] This utility model belongs to the field of automotive industry technology, specifically relating to the final forging die of a cross shaft frame. Background Technology

[0002] The cross-shaft frame component is used in a compact double universal joint. The double universal joint is a key component for meeting the complex off-road requirements of all-wheel-drive vehicles. Its unique structural design ensures stable power transmission to the wheels even when the driveshaft angle changes. When wheel steering or bumps cause dynamic changes in the driveshaft angle, this component eliminates speed fluctuations, achieving complete synchronous rotation of the input / output shafts. Its double structure (two universal joints connected in series via an intermediate shaft) compensates for angular velocity differences through a specific phase arrangement, avoiding the torque fluctuations of traditional single universal joints. This compact double universal joint offers excellent space adaptability, significantly reducing the deflection angle required for a single universal joint, allowing for a more compact driveshaft layout, making it particularly suitable for special vehicles such as military off-road vehicles with limited chassis space.

[0003] The final forging of the cross shaft frame needs to withstand significant torque and stress during operation, and a forged blank is generally used to ensure its strength. For example... Figure 1 , Figure 2 yes Figure 3 As shown, the cross shaft frame forging has a rectangular frame structure with arcs on all four sides. In the main view direction, two opposite sides are thick-walled and the other two opposite sides are thin-walled. There are two protruding shafts 1 on the outer side of the two opposite planes, and a rectangular through hole 2 in the middle part of the forging. This type of cross shaft frame is usually manufactured using a forging process. The cross shaft frame structure has thick walls 3 and thin walls 4, a protruding shaft 1, and a rectangular through hole 2, resulting in an uneven cross-sectional area distribution. Due to its complex structure, defects such as folding and incomplete forging are prone to occur during forging. Traditional forging processes often use "upsetting plus final forging" or direct "final forging," omitting the pre-forging process. This leads to problems such as incomplete forging in the final forging cavity, low raw material utilization, and short mold life. In addition, since the upsetting billet is cylindrical, it is easy to place it off-center when it is upsetting after the blank is heated. This also leads to some parts being incompletely forged in the final forging cavity and becoming scrap. Moreover, the mold is subjected to uneven force, which can cause the parts subjected to greater force to be easily damaged. Utility Model Content

[0004] In order to solve the above-mentioned technical problems in the prior art, this utility model provides a cross-shaft frame final forging mold that provides accurate positioning of the pre-forging part after it is placed into the final forging cavity, high material utilization, long mold life, and good forging product quality.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a cross-shaft frame final forging die, including an upper final forging die and a lower final forging die, the upper final forging die is set on the movable die frame of the forging press, the lower final forging die is set on the worktable of the forging press, a final forging cavity is provided between the bottom surface of the upper final forging die and the top surface of the lower final forging die, a final forging parting surface is formed between the bottom surface of the upper final forging die and the top surface of the lower final forging die, an annular flash compartment is provided on the upper and lower sides of the final forging parting surface around the final forging cavity, a quadrangular prism-shaped final forging protrusion is provided on the lower final forging die inside the final forging cavity, a final forging square annular cavity is provided on the lower part of the final forging cavity outside the final forging protrusion, a final forging cylindrical groove is provided on the middle of the front side and the middle of the rear side of the final forging cavity, and a triangular protrusion is provided on the front side and the rear side of the lower part of the final forging protrusion.

[0006] The four edges of the final forging punch are all rounded, and the outer surface of the final forging punch has a draft angle of 2-5°.

[0007] The upper die for final forging has a square concave boss with a thickness of 3mm in the middle of the top surface of the final forging cavity. The square concave boss is located directly above the final forging boss. Both the bottom surface of the square concave boss and the top surface of the final forging boss are arc surfaces. There is a 5mm gap between the square concave boss and the final forging boss.

[0008] A final forging ejection hole is provided vertically along the inner edge of the final forging lower die. The upper end of the final forging ejection hole is located at the center of the top surface of the final forging protrusion. A final forging demolding ejector is provided in the final forging ejection hole, and the lower end of the final forging demolding ejector is connected to a final forging ejection cylinder.

[0009] The top surface of the final forging protrusion is provided with a process step groove at the upper end of the final forging ejection hole.

[0010] By adopting the above technical solution, this utility model has the following beneficial effects: 1) The shape of the pre-forging part can play a good role in pre-forming and material distribution, which helps to fill the final forging part and improves the material utilization rate. The square column hole forged in the pre-forging part matches the final forging protrusion, which can realize the positioning of the pre-forging part when it is placed in the final forging cavity.

[0011] 2) The process step groove is set to increase the intermediate thickness of the final forging skin on the final forging part, so as to avoid the final forging ejector cylinder breaking the final forging skin during demolding and ensure the reliability of demolding.

[0012] 3) The 3mm thick square concave boss makes the final forging part have a 3mm deep shallow groove on the top of the final forging skin. The connection position between the punching skin and the final forging part is inside the square column hole. After the final forging skin is punched off during the punching operation, there will be no burrs on the outside of the final forging part.

[0013] 4) The triangular protrusions are designed by stamping two triangular grooves on the final forging, which is a process requirement for cross shaft frame products. The flash bin holds the excess metal material (flash) after final forging, and the flash is removed during the trimming operation.

[0014] In summary, this utility model can achieve precise positioning by matching the shallow square column hole of the pre-forging part with the pre-forging protrusion, so that the metal material can completely fill the final forging cavity during the final forging process, greatly reducing the scrap rate of the final forging part. During forging, the upper and lower dies of the final forging are subjected to balanced forces, the die has a long service life, and it is easy to demold after the final forging is completed. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the final forging of the cross shaft frame; Figure 2 This is a frontal projection view of the final forging of the cross-shaft frame; Figure 3 yes Figure 2 Top view; Figure 4 These are the three views of the pre-forged part after the pre-forging process; Figure 5 This is a schematic diagram of the vertical cross-sectional structure of the final forging die; Figure 6 yes Figure 5 Top view of the lower die for intermediate and final forging; Figure 7 This is a three-dimensional structural diagram of a forged part with flash after the final forging process; Figure 8 This is a cross-sectional view of the final forging after the final forging process. Detailed Implementation

[0016] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] like Figure 5 and Figure 6As shown, the cross-shaft frame final forging die of this utility model includes an upper final forging die 25 and a lower final forging die 26 corresponding to each other. The upper final forging die 25 is set on the movable die frame of another forging press, and the lower final forging die 26 is set on the worktable of the forging press. A final forging cavity 27 is provided between the bottom surface of the upper final forging die 25 and the top surface of the lower final forging die 26. A final forging parting surface 28 is formed between the bottom surface of the upper final forging die 25 and the top surface of the lower final forging die 26. Annular flash compartments 29 are provided on the upper and lower sides of the final forging parting surface 28 around the final forging cavity 27. A quadrangular prism-shaped final forging protrusion 30 is provided on the lower final forging die 26 inside the final forging cavity 27. The four edges of the final forging protrusion 30 are all rounded. The outer surface of the final forging protrusion 30 has a draft angle of 2-5°. A square concave boss 31 with a thickness of 3mm is provided on the upper final forging die 25 in the middle of the top surface of the final forging cavity 27. The square concave boss 31 is located directly above the final forging boss 30. The bottom surface of the square concave boss 31 and the top surface of the final forging boss 30 are both arc surfaces. There is a 5mm gap between the square concave boss 31 and the final forging boss 30. The lower part of the final forging cavity 27 is a final forging square annular cavity outside the final forging boss 30. A final forging cylindrical groove 32 (compatible with the protruding shaft 1) is provided in the middle of the front side and the middle of the rear side of the final forging cavity 27. A final forging ejection hole 33 is provided vertically inside the lower final forging die 26. The upper end of the final forging ejection hole 33 is located at the center of the top surface of the final forging boss 30. A final forging demolding ejector rod 34 is provided in the final forging ejection hole 33. The lower end of the final forging demolding ejector rod 34 is connected to the final forging ejection cylinder. A process step groove 35 is provided on the top surface of the final forging boss 30 at the upper end of the final forging ejection hole 33. A triangular protrusion 36 is provided on the front and rear sides of the lower part of the final forging boss 30.

[0018] The final forging process involves placing the pre-forged part 16 into the final forging die on the forging press. The structure of the pre-forged part 16 is as follows: Figure 4 As shown.

[0019] The specific process of the final forging process is as follows: First, the pre-forged part 16 is placed into the final forging cavity 27 of the lower forging die 26. The square column hole 37 forged by the pre-forging protrusion 9 in the pre-forged part 16 is correspondingly assembled onto the final forging protrusion 30 of the lower forging die 26, thus achieving the positioning of the pre-forged part 16. Then, the final forging press is started, and the upper forging die 25 moves downward to forge the pre-forged part 16. The pre-forged part 16 fills the final forging cavity 27, and the depth of the square column hole 37 increases. The square concave boss 31 presses an arc-shaped stepped groove 39 into the top surface of the final forging part 38. There is a 5mm final forging connection between the bottom of the arc-shaped stepped groove 39 and the top surface of the square column hole 37. The triangular protrusions 36 on the front and rear sides of the lower part of the forging 40 and the final forging protrusion 30 press out two triangular grooves 41 at the corresponding positions of the final forging 38. The process step groove 35 at the upper end of the final forging ejector hole 33 forms a circular protrusion on the bottom surface of the final forging connecting skin 40, increasing the thickness of the final forging connecting skin 40 and preventing the final forging demolding ejector 34 from breaking the final forging connecting skin 40. At the same time, it does not affect the punching. Excess metal material flows into the flash bin 29 through the gap of the final forging parting surface 28. After the final forging operation is completed, the final forging upper die 25 moves upward, and the final forging ejector cylinder drives the final forging demolding ejector 34 to move upward to eject the final forging 38, completing the demolding of the final forging 38. The final forging 38 with flash 52 is as follows. Figure 7 and Figure 8 As shown.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A cross-shaft frame final forging die, comprising an upper final forging die and a lower final forging die, the upper final forging die being mounted on the movable die frame of a forging press, the lower final forging die being mounted on the worktable of the forging press, a final forging cavity being provided between the bottom surface of the upper final forging die and the top surface of the lower final forging die, a final forging parting surface being formed between the bottom surface of the upper final forging die and the top surface of the lower final forging die, and annular flash packs being provided on the upper and lower sides of the final forging parting surface around the final forging cavity, characterized in that: The final forging die has a quadrangular prism-shaped final forging protrusion inside the final forging cavity. The lower part of the final forging cavity is a final forging square annular cavity outside the final forging protrusion. There is a final forging cylindrical groove in the middle of the front side and the middle of the rear side of the final forging cavity. There is a triangular protrusion in the front and rear sides of the lower part of the final forging protrusion.

2. The final forging die for the cross shaft frame according to claim 1, characterized in that: The four edges of the final forging punch are all rounded, and the outer surface of the final forging punch has a draft angle of 2-5°.

3. The final forging die for the cross shaft frame according to claim 1, characterized in that: The upper die for final forging has a square concave boss with a thickness of 3mm in the middle of the top surface of the final forging cavity. The square concave boss is located directly above the final forging boss. Both the bottom surface of the square concave boss and the top surface of the final forging boss are arc surfaces. There is a 5mm gap between the square concave boss and the final forging boss.

4. The final forging die for the cross shaft frame according to claim 1, characterized in that: A final forging ejection hole is provided vertically along the inner edge of the final forging lower die. The upper end of the final forging ejection hole is located at the center of the top surface of the final forging protrusion. A final forging demolding ejector is provided in the final forging ejection hole, and the lower end of the final forging demolding ejector is connected to a final forging ejection cylinder.

5. The final forging die for the cross shaft frame according to claim 1, characterized in that: The top surface of the final forging protrusion is provided with a process step groove at the upper end of the final forging ejection hole.

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