Cross axle frame preforming die

Abstract

The utility model discloses a cross axle frame preforming die, including corresponding preforming upper die and preforming lower die, and is equipped with preforming cavity between preforming upper die bottom surface and preforming lower die top surface, and is equipped with preforming convex column in preforming cavity in preforming lower die, and preforming convex column upper end surface is higher than preforming parting surface, and preforming convex column upper end surface is equipped with a preforming positioning groove, preforming cavity front side middle part and rear side middle part all are equipped with a preforming cylindrical groove. The utility model discloses an arc -shaped groove structure of positioning upsetting blank is designed, and special tongs are used to hold upsetting blank and place to preforming convex column simultaneously, make upsetting blank be positioned in front and back, left and right direction all and be positioned well, ensure that metal material can fill preforming cavity in preforming process, and preforming upper die and preforming lower die stress balance also, alleviate the forging amount of final forging process, and forging quality improves, and preforming die and final forging die are all life stable.

Description

Technical Field

[0001] This utility model belongs to the field of automotive industry technology, specifically relating to a cross shaft frame pre-forging mold. 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 final forging of the cross shaft frame has a rectangular frame structure with arc-shaped surfaces on all four sides. In the front view direction, two opposite surfaces are thick-walled (3), and the other two opposite surfaces are thin-walled (4). There are two protruding shafts (1) on the outer sides of the two opposite planes, and a rectangular through hole (2) in the middle of the forging. This type of cross shaft frame is usually manufactured by forging. The cross shaft frame structure has thick walls (3) and thin walls (4), protruding shafts (1), and rectangular through hole (2), resulting in 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, the placement and positioning of the upsetting billet must be considered during forging. 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 pre-forging mold that can accurately position and place upsetting billets, fill the mold cavity, and has a high material utilization rate.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a cross-shaft frame pre-forging mold, including an upper pre-forging mold and a lower pre-forging mold corresponding to each other. The upper pre-forging mold is set on the movable mold frame of the forging press, and the lower pre-forging mold is set on the worktable of the forging press. A pre-forging cavity is provided between the bottom surface of the upper pre-forging mold and the top surface of the lower pre-forging mold. A pre-forging parting surface is formed around the pre-forging cavity between the lower surface of the upper pre-forging mold and the upper surface of the lower pre-forging mold. A quadrangular prism-shaped pre-forging protrusion is provided on the lower pre-forging mold inside the pre-forging cavity. The upper end face of the pre-forging protrusion is higher than the pre-forging parting surface. A pre-forging positioning groove is opened on the upper end face of the pre-forging protrusion along the left and right direction. The lower part of the pre-forging cavity is a pre-forging square annular cavity outside the pre-forging protrusion. A pre-forging cylindrical groove is provided in the middle of the front side and the middle of the rear side of the pre-forging cavity.

[0006] The four edges of the pre-forged punch are all rounded, and the outer surface of the pre-forged punch has a draft angle of 2-5°. The bottom contour of the pre-forging positioning groove along the front-to-back direction is an arc segment, and the radius of the arc segment is equal to the radius of the upsetting billet.

[0007] A pre-forging ejection hole is provided vertically inside the pre-forging lower die. The upper end of the pre-forging ejection hole is located at the center of the pre-forging positioning groove. A pre-forging demolding ejector rod is provided inside the pre-forging ejection hole. The lower end of the pre-forging demolding ejector rod is connected to a pre-forging ejection cylinder.

[0008] By adopting the above technical solution, this utility model has the following beneficial effects: 1) During pre-forging, a special clamp is used to hold the upsetting billet and place it on top of the pre-forging protrusion in the lower pre-forging die. A pre-forging positioning groove is set on the top of the pre-forging protrusion in the lower pre-forging die. The bottom cross-sectional profile of the pre-forging positioning groove is an arc segment, which is exactly the horizontal position for positioning the cylindrical upsetting billet. When the clamp holds the upsetting billet and places it on the lower pre-forging die, the end face of the upsetting billet needs to be placed at the bottom of the clamp (the right end face of the upsetting billet is in contact with the left side of the two semicircular plates of the clamp), and the left side of the semicircular ring of the clamp is in contact with the right side of the pre-forging protrusion. This way, the upsetting billet can be placed in the middle of the pre-forging cavity in the left-right direction, so that the metal can fill the pre-forging cavity after pre-forging.

[0009] 2) The square column hole forged by the pre-forged punch mates with the final forging punch in the final forging die during the final forging process, achieving workpiece positioning during the final forging operation. The pre-forged cylindrical groove corresponds to the protruding shaft of the forged cross shaft frame.

[0010] 3) The pre-forging lower die is designed with a pre-forging ejection hole. The pre-forging ejection cylinder drives the pre-forging demolding ejector rod to lift the pre-forging part upward, facilitating demolding. After the pre-forging process...

[0011] In summary, this utility model, by designing an arc-shaped groove structure for positioning the upsetting billet and using a specially made clamp to hold the upsetting billet and place it on the pre-forging protrusion, ensures that the upsetting billet is well positioned in the front-back and left-right directions. This ensures that the metal material can fill the pre-forging cavity during the pre-forging process. At the same time, the upper and lower pre-forging dies are subjected to balanced forces, which also reduces the forging amount in the final forging process, improves the quality of the forgings, and ensures stable service life for both the pre-forging die and the final forging die. Attached Figure Description

[0012] Figure 1 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 This is a vertical sectional view of the pre-forging die. Figure 5 yes Figure 4 Top view of the lower die for pre-forging; Figure 6 These are the three views of the pre-forged part after the pre-forging process; Figure 7 This is a schematic diagram of the clamps used to hold the upsetting billet during pre-forging; Figure 8 This is a three-dimensional structural diagram of the clamping part of the clamp; Figure 9 This is a schematic diagram of using clamps to hold the upsetting billet and place it on the pre-forging lower die. Detailed Implementation

[0013] 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.

[0014] like Figure 4 and Figure 5As shown, the cross-shaft frame pre-forging die of this utility model includes an upper pre-forging die 5 and a lower pre-forging die 6, which are correspondingly positioned. The upper pre-forging die 5 is set on the movable die frame of the forging press, and the lower pre-forging die 6 is set on the worktable of the forging press. A pre-forging cavity 7 is provided between the bottom surface of the upper pre-forging die 5 and the top surface of the lower pre-forging die 6. A pre-forging parting surface 8 is formed around the pre-forging cavity 7 between the lower surface of the upper pre-forging die 5 and the upper surface of the lower pre-forging die 6. A quadrangular prism-shaped pre-forging protrusion 9 is provided on the lower pre-forging die 6 within the pre-forging cavity 7. The four edges of the pre-forging protrusion 9 are all rounded, and the outer surface of the pre-forging protrusion 9 has a draft angle of 2-5°. The upper end face of the pre-forging protrusion 9 is higher than the pre-forging parting surface 8. A pre-forging positioning groove 10 is provided on the upper end face of the pre-forging protrusion 9 along the left-right direction. The bottom contour of the pre-forging positioning groove 10 along the front-back direction is an arc segment 11, and the radius of the arc segment 11 is equal to the radius of the cylindrical upsetting billet 12. The lower part of the pre-forging cavity 7 is a pre-forging square annular cavity outside the pre-forging protrusion 9. A pre-forging cylindrical groove 13 is provided in the middle of the front side and the middle of the rear side of the pre-forging cavity 7. A pre-forging ejection hole 14 is provided vertically inside the pre-forging lower die 6. The upper end of the pre-forging ejection hole 14 is located at the center of the pre-forging positioning groove 10. A pre-forging demolding ejector rod 15 is provided in the pre-forging ejection hole 14. The lower end of the pre-forging demolding ejector rod 15 is connected to a pre-forging ejection cylinder. The specific process of the pre-forging process is as follows: The upsetting billet 12 is clamped using clamps and placed onto the pre-forging positioning groove 10 on the lower pre-forging die 6. The outer arc surface of the upsetting billet 12 is in contact with the bottom of the pre-forging positioning groove 10, positioning the upsetting billet 12 in the front-to-back direction. Positioning in the left-to-right direction is achieved through the cooperation between the clamps and the lower pre-forging die 6, ensuring the upsetting billet 12 is properly positioned on the lower pre-forging die 6. Then, the clamps are released and removed. Next, the pre-forging press is started, and the upper pre-forging die 5 moves down to forge the upsetting billet 12. After pre-forging is completed, the upper pre-forging die 5 moves up, and the pre-forging ejector cylinder is activated. The pre-forging ejector cylinder drives the pre-forging ejector rod 15 to extend upwards, ejecting the pre-forged part from the lower pre-forging die 6 and removing the pre-forged part 16, thus completing the pre-forging process. The structure of the pre-forged part 16 is as follows: Figure 6 As shown.

[0015] like Figure 7 , Figure 8 and Figure 9As shown, the clamp for holding the upsetting billet 12 includes a first clamping rod 17 and a second clamping rod 18 arranged in the left-right direction along its length. The first clamping rod 17 and the second clamping rod 18 are rotatably connected by a pin 19. The first clamping rod 17 and the second clamping rod 18 have a hand-held part on the right side of the pin 19. The left end of the first clamping rod 17 and the second clamping rod 18 is provided with a clamping part that can be opened and closed vertically. The clamping part includes an upper clamp and a lower clamp arranged symmetrically vertically. The upper clamp and the lower clamp each include a semicircular ring 20, an arc plate 21 and a semicircular plate 22 arranged on the same center line. The right end of the semicircular ring 20 is flush with the semicircular plate 22. The left side is fixedly connected, and the right end face of the arc plate 21 is fixedly connected to the middle position of the left end ring face of the semicircular ring 20. The outer diameters of the semicircular ring 20, the arc plate 21, and the semicircular plate 22 are equal, and the inner diameters of the semicircular ring 20 and the arc plate 21 are equal. The right side face of the semicircular plate 22 of the upper clamp is fixedly connected to the first clamping rod 17, and the right side face of the semicircular plate 22 of the lower clamp is fixedly connected to the second clamping rod 18. The open side of the semicircular ring 20 of the upper clamp faces downward, and the open side of the semicircular ring 20 of the lower clamp faces upward. The left side face of the semicircular plate 22 is the positioning surface 23 of the upsetting billet 12, and the left side face of the semicircular ring 20 is the positioning surface 24 of the pre-forging die. The specific process of clamping the upsetting billet 12 and placing it on the pre-forging lower die 6 is as follows: the upper and lower clamps of the clamp open, so that the right end face of the upsetting billet 12 contacts the left side face of the two semi-circular plates 22, and the two arc plates 21 clamp the outer circle of the upsetting billet 12. Then, the upsetting billet 12 is placed horizontally on the pre-forging positioning groove 10 on the top surface of the pre-forging protrusion 9 in the pre-forging lower die 6, and the left side face of the semi-circular ring 20 contacts the right side face of the pre-forging protrusion 9. After the clamp is released, the position of the upsetting billet 12 on the pre-forging lower die 6 achieves positioning in the left-right and front-back directions.

[0016] 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 pre-forging die, characterized in that: It includes an upper pre-forging die and a lower pre-forging die, which are corresponding to each other. The upper pre-forging die is set on the movable die frame of the forging press, and the lower pre-forging die is set on the worktable of the forging press. A pre-forging cavity is provided between the bottom surface of the upper pre-forging die and the top surface of the lower pre-forging die. A pre-forging parting surface is formed around the pre-forging cavity between the lower surface of the upper pre-forging die and the upper surface of the lower pre-forging die. A quadrangular prism-shaped pre-forging protrusion is provided on the lower pre-forging die inside the pre-forging cavity. The upper end face of the pre-forging protrusion is higher than the pre-forging parting surface. A pre-forging positioning groove is opened on the upper end face of the pre-forging protrusion along the left and right direction. The lower part of the pre-forging cavity is a pre-forging square annular cavity outside the pre-forging protrusion. A pre-forging cylindrical groove is provided in the middle of the front side and the middle of the rear side of the pre-forging cavity.

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

3. The cross-shaft frame pre-forging die according to claim 1, characterized in that: The bottom contour of the pre-forging positioning groove along the front-to-back direction is an arc segment, and the radius of the arc segment is equal to the radius of the upsetting billet.

4. The cross shaft frame pre-forging die according to claim 1, 2, or 3, characterized in that: A pre-forging ejection hole is provided vertically inside the pre-forging lower die. The upper end of the pre-forging ejection hole is located at the center of the pre-forging positioning groove. A pre-forging demolding ejector rod is provided inside the pre-forging ejection hole. The lower end of the pre-forging demolding ejector rod is connected to a pre-forging ejection cylinder.

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