A thin-walled part bending and forging process

Abstract

The present application relates to the technical field of thin-walled part forging, and particularly provides a thin-walled part bending forging process, which comprises the following steps: heating a bar to a preset temperature to obtain a blank; forging the blank into a flat blank; forging the flat blank into a bowl-shaped structure in a first die to obtain a thin-walled bowl-shaped part; bending the thin-walled bowl-shaped part to form a thin-walled rough part; and forging the thin-walled rough part in a second die to obtain a target thin-walled part. The thin-walled part bending forging process can make the flat blank extend in the opposite direction of the movement direction of the movable die of the first die during the forging process, so that the flat blank is more likely to fill the first die, which is beneficial to improving the integrity and uniformity of the forged part, effectively reducing the forming difficulty of the vertical thin-walled part, and reducing the lateral pressure and Y-direction pressure borne by the die, so that stress concentration is not easily formed, and the service life of the die is significantly improved.

Description

A bending and forging process for thin-walled parts Technical Field

[0001] This invention relates to the field of thin-walled forging technology, and specifically provides a bending and forging process for thin-walled parts. Background Technology

[0002] Die forging, as a highly efficient and precise metal plastic forming technology, is widely used in the automotive, aerospace, and equipment manufacturing industries, especially in manufacturing components with complex geometries (such as the vertical thin-walled parts shown in Figure 1). With the advancement of industrial lightweighting trends, the demand for thin-walled, high-precision forgings is increasing, and these components play a crucial role in reducing overall weight and improving structural strength.

[0003] In existing technologies, extrusion forging is a conventional method for forming vertical thin-walled parts. Its core principle is to apply pressure vertically to force the billet into pre-forging and final forging cavities. Specifically, the pre-forging cavity is designed to approximate the final shape of the forging. The billet fills the cavity under positive pressure in the Y-direction (i.e., the vertical direction of the die). The pressure in the pre-forging stage is approximately 2100 tons, and the pressure in the final forging stage is approximately 1040 tons. Simultaneously, this process relies on an extrusion molding mechanism to form the vertical sidewalls, resulting in significant X-direction extrusion pressure (i.e., lateral pressure) between the forging sidewalls and the die sidewalls. This pressure is approximately 123 tons in the pre-forging stage and approximately 46 tons in the final forging stage.

[0004] However, the aforementioned existing technologies have serious drawbacks: First, during the forming process of vertical thin-walled parts, the metal flow is restricted by the mold structure, which can easily lead to incomplete filling of the thin-walled area, affecting the integrity and dimensional accuracy of the forging; Second, the extrusion forming mechanism of the vertical sidewall forces the mold to bear excessive lateral pressure (such as 123 tons for pre-forging and 46 tons for final forging in the X direction), coupled with the superposition of high pressure in the Y direction (2100 tons for pre-forging and 1040 tons for final forging), stress concentration is formed at the corner of the upper and lower molds, which can easily cause mold cracking and failure, while significantly aggravating sidewall wear, ultimately leading to a significant reduction in mold life. Summary of the Invention

[0005] This invention addresses the shortcomings of the prior art by providing a bending and forging process for thin-walled parts, reducing the lateral and vertical pressures on the die during extrusion molding and improving die life.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A bending and forging process for thin-walled parts includes:

[0008] The bar stock is heated to a preset temperature to obtain a billet;

[0009] The billet is forged into a flat billet;

[0010] The flat blank is forged into a bowl-shaped structure in a first mold to obtain a thin-walled bowl-shaped part, wherein two opposite sidewalls of the thin-walled bowl-shaped part are rotated outward by a first preset angle, and the other two opposite sidewalls of the thin-walled bowl-shaped part are rotated inward by a second preset angle.

[0011] The thin-walled bowl-shaped part is bent into shape to obtain a thin-walled coarse part, wherein the two opposite sidewalls of the thin-walled coarse part are parallel;

[0012] The thin-walled rough part is forged in a second mold to obtain the target thin-walled part.

[0013] Furthermore, after forging the billet into a flat billet, the oxide scale on the flat billet is removed;

[0014] The flat blank, after the oxide scale has been removed, is forged into a bowl-shaped structure in the first mold.

[0015] Furthermore, the first preset angle is 20-30°, and the second preset angle is 10-20°.

[0016] Furthermore, the flat billet is forged into a bowl-shaped structure in a first mold, and the Y-axis pressure of the first mold is 1600-1700 tons.

[0017] Furthermore, the thin-walled rough part is forged in a second mold, the Y-axis pressure of which is 150-180 tons.

[0018] Furthermore, after obtaining the target thin-walled part, the residual edge of the target thin-walled part is removed in the third mold.

[0019] Furthermore, the third mold includes an upper mold that is movably disposed and a lower mold that is fixedly disposed, wherein the movement direction of the upper mold is perpendicular to the lower mold;

[0020] A ring cutting blade is fixedly installed on the surface of the upper mold facing the lower mold. Side cutting blades are fixedly installed on both opposite sides of the ring cutting blade. Both side cutting blades are located outside the ring cutting blade, and the length direction of the side cutting blades is perpendicular to the ring cutting blade.

[0021] The lower mold has a cavity facing the upper mold, and the cavity is positioned opposite to the circumferential cutting edge.

[0022] Two blind holes are formed on the surface of the upper mold facing the lower mold. The two blind holes are symmetrically distributed on both sides of the circumferential cutting edge, and the line connecting the two blind holes is perpendicular to the line connecting the two edge cutting edges. The inner end of each blind hole is fixedly connected to the upper end of a tension spring, and the lower end of each tension spring is fixedly connected to the upper end of a pressure rod. The lower end of each pressure rod has a groove, and each groove is connected to one end of a lever through a torsion spring. The angle between each lever and the corresponding pressure rod is 150-170°.

[0023] Each of the two blind holes has a sliding groove on its opposite side, the sliding groove being parallel to the pressure rod, a slider being movably installed in each sliding groove, and each slider being fixedly connected to the corresponding pressure rod;

[0024] The upper mold has wheel grooves on both sides, each wheel groove communicating with a corresponding slide groove. A ratchet and a spool are rotatably installed in each wheel groove. A portion of each ratchet is located outside the corresponding wheel groove. Each ratchet is coaxially connected to a first gear, and each spool is coaxially connected to a second gear. Two second gears are located between two first gears, and each second gear meshes with a corresponding first gear. The lower mold has two discharge ports on its surface facing the upper mold, symmetrically distributed on both sides of the cavity. Two guide wheel assemblies are fixedly installed on the lower mold's surface facing the upper mold, each guide wheel assembly located on the side of the corresponding discharge port facing away from the cavity. Each slider is fixedly connected to both ends of a rope, and each rope passes over the corresponding spool and guide wheel assembly.

[0025] The upper mold is provided with ratchet racks on both sides, and the ratchet racks can move in a direction perpendicular to the upper mold. Each ratchet can mesh with the corresponding ratchet rack.

[0026] Furthermore, the upper mold is provided with limiting boxes on both sides, and the limiting boxes are open to one side facing the upper mold. Each ratchet is located in the corresponding limiting box and is connected by a spring.

[0027] Furthermore, the lever has an L-shaped or J-shaped structure.

[0028] Compared with the prior art, the thin-walled part bending and forging process of the present invention has the following outstanding advantages:

[0029] (1) By forging a flat billet into a thin-walled bowl-shaped part, the present invention enables the flat billet to extend in the opposite direction of the movement direction of the movable mold of the first mold during the forging process. Under the first preset angle and the second preset angle, the flat billet is more likely to fill the first mold, which is beneficial to improving the integrity and uniformity of the forging.

[0030] (2) After bending and forging the thin-walled bowl-shaped part, the target thin-walled part can be obtained. This invention effectively reduces the forming difficulty of vertical thin-walled parts, and can reduce the lateral pressure and Y-direction pressure on the mold, making it less prone to stress concentration and significantly improving the service life of the mold.

[0031] (3) The present invention significantly reduces forging energy consumption and also reduces the tonnage requirement of forging equipment while reducing the pressure on the mold. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 is a schematic diagram of a vertical thin-walled component;

[0034] Figure 2 is a schematic diagram of the bending and forging process of a thin-walled part;

[0035] Figure 3 is a schematic diagram of the thin-walled bowl-shaped component.

[0036] Figure 4 is a schematic diagram of the third mold;

[0037] Figure 5 is a partial enlarged view of Figure 4, section I;

[0038] Figure 6 is a partial enlarged view of Part II of Figure 4.

[0039] The markings in the attached diagram represent:

[0040] 1. Upper mold, 2. Lower mold, 3. Ring cutting blade, 4. Side cutting blade, 5. Cavity, 6. Blind hole, 7. Tension spring, 8. Pressure rod, 9. Groove, 10. Pulley, 11. Slide groove, 12. Slider, 13. Wheel groove, 14. Ratchet, 15. Thread wheel, 16. First gear, 17. Second gear, 18. Discharge port, 19. Guide wheel assembly, 191. First guide wheel, 192. Second guide wheel, 193. Electric actuator, 194. Third guide wheel, 20. Thread, 21. Ratchet, 22. Limiting box, 23. Spring. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0042] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "left," and "right" generally refer to the upper, lower, left, and right as shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0043] The following is a preferred embodiment:

[0044] As shown in Figure 2, the thin-walled part bending and forging process in this embodiment includes:

[0045] S100: Heat the bar stock to a preset temperature to obtain a billet.

[0046] It should be noted that before step S100, the raw material is cut into bars of a preset length using a circular saw. In step S100, the bars are heated to a preset temperature using an induction furnace. The preset temperature is 1100-1200℃.

[0047] S200, the billet is forged into a flat billet.

[0048] It should be noted that in step S200, the billet is forged into a flat billet using a J21-250 open press or a JH21-250 closed press.

[0049] In the specific implementation process, after forging the billet into a flat billet, the process further includes: S300, removing the oxide scale from the flat billet. It should be noted that a high-pressure water descaling machine is used to remove the oxide scale from the flat billet.

[0050] S400, the flat blank is forged into a bowl-shaped structure in the first mold to obtain a thin-walled bowl-shaped part, wherein two opposite sidewalls of the thin-walled bowl-shaped part are rotated outward by a first preset angle, and the other two opposite sidewalls of the thin-walled bowl-shaped part are rotated inward by a second preset angle.

[0051] It is easy to understand that in step S400, the flat blank after removing the oxide scale is forged into a bowl-shaped structure in the first mold.

[0052] As shown in Figure 3, in the specific implementation process, the first preset angle is 20-30°, and the second preset angle is 10-20°. It is easy to understand that the two opposite sidewalls of the first mold rotate outward by 20-30°, and the other two opposite sidewalls of the first mold rotate inward by 10-20°. This can be adjusted according to the specific structure of the target thin-walled part; for example, the two opposite sidewalls of the first mold could rotate outward by 15°, and the other two opposite sidewalls could rotate inward by 8°, etc.

[0053] In the specific implementation process, the flat blank is forged into a bowl-shaped structure in the first mold, and the Y-axis pressure of the first mold is 1600-1700 tons. Correspondingly, the lateral pressure of the first mold, i.e., the X-axis pressure, is 20-25 tons. It is easy to understand that in other embodiments, the Y-axis pressure of the first mold can also be 1200-1600 tons, such as 1400 tons, depending on the specific setting of the material, structure, and size parameters of the thin-walled bowl-shaped part.

[0054] It should be noted that in step S400, a friction press or a 63kJ die forging hammer is used to forge the flat billet into a thin-walled bowl-shaped part.

[0055] In some specific examples, the Y-axis pressure of the first mold is 1680 tons. Correspondingly, the lateral pressure of the first mold is 22 tons.

[0056] S500, the thin-walled bowl-shaped part is bent into shape to obtain a thin-walled coarse part, wherein the two opposite sidewalls of the thin-walled coarse part are parallel.

[0057] It should be noted that in step S500, a J21-500 open press or a 63kj die forging hammer is used to bend the thin-walled bowl-shaped part into a thin-walled rough part.

[0058] It is easy to understand that the forming of thin-walled, thick parts can be achieved in a mold, which, for ease of distinction, will be referred to as the fourth mold in this embodiment. During bending forming, the Y-axis pressure of the fourth mold is 420-480 tons. Correspondingly, the lateral pressure of the fourth mold is 3-4 tons.

[0059] In some specific examples, the Y-axis pressure of the fourth mold is 457 tons. Correspondingly, the lateral pressure of the fourth mold is 3.4 tons.

[0060] S600, the thin-walled rough part is forged in the second mold to obtain the target thin-walled part.

[0061] In the specific implementation process, the thin-walled rough part is forged in a second mold, and the Y-axis pressure of the second mold is 150-180 tons. Correspondingly, the lateral pressure of the second mold is 3.5-4.5 tons.

[0062] It should be noted that in step S600, a friction press or a 63kJ die forging hammer is used to forge the thin-walled rough part into the target thin-walled part.

[0063] In some specific examples, the Y-axis pressure of the second mold is 165 tons. Correspondingly, the lateral pressure of the second mold is 4 tons.

[0064] It should be understood that in other embodiments, other equipment may be used to implement steps S100-S600. The preset temperature, forging pressure, first preset angle and second preset angle can be set according to the material, structure, size parameters and other specific settings of the workpiece. This application does not limit this.

[0065] In the above embodiments, forging a flat billet into a thin-walled bowl-shaped part allows the flat billet to extend in the opposite direction of the moving die of the first die during the forging process. At the first and second preset angles, the flat billet more easily fills the first die, which is beneficial to improving the integrity and uniformity of the forging. After bending and secondary forging of the thin-walled bowl-shaped part, the target thin-walled part can be obtained, which effectively reduces the forming difficulty of vertical thin-walled parts and reduces the lateral and Y-direction pressure on the die, making it less prone to stress concentration and significantly improving the service life of the die. In addition, it can also significantly reduce forging energy consumption and the tonnage requirement of forging equipment.

[0066] During the forging process, to ensure the complete forming of the target thin-walled part, the bar stock will have a certain allowance. As the bar stock continues to extend, the allowance will overflow from the forging die cavity, thus entering the space between the upper and lower dies of the forging die, forming a residual edge. Therefore, in specific implementation, after obtaining the target thin-walled part, the residual edge is removed from the target thin-walled part in a third die.

[0067] It should be noted that the J21-250 open press or the JH21-250 closed press is used to remove the residual edges of the target thin-walled part.

[0068] When removing residual edges using the aforementioned or other equipment, it is often impossible to directly separate the target thin-walled part from the residual edge. Instead, the connection between the target thin-walled part and the residual edge is pressed to an extremely thin thickness, and then workers remove it and gently tap it to achieve complete separation. Even after a series of forging processes, the temperature of the target thin-walled part decreases, but it is still an unbearable high temperature for the human body. During the tapping process, whether it is the target thin-walled part or the residual edge falling off, or even the splattered debris, it will cause serious harm to the human body if it comes into contact with it, posing a production safety hazard.

[0069] Therefore, as shown in Figures 4-6, in the specific implementation process, the third mold includes an upper mold 1 that is movably set and a lower mold 2 that is fixedly set, and the movement direction of the upper mold 1 is perpendicular to the lower mold 2.

[0070] It is easy to understand that the third mold is a mold for a J21-250 open press or a JH21-250 closed press. The upper mold 1 moves perpendicular to the lower mold 2 through the power of the J21-250 open press or the JH21-250 closed press.

[0071] The upper mold 1 is fixedly mounted with a ring cutting blade 3 facing the lower mold 2. Side cutting blades 4 are fixedly mounted on both opposite sides of the ring cutting blade 3. Both side cutting blades 4 are located outside the ring cutting blade 3, and the length direction of the side cutting blades 4 is perpendicular to the ring cutting blade 3.

[0072] The lower mold 2 has a cavity 5 facing the upper mold 1, and the cavity 5 is arranged opposite to the circumferential cutting blade 3.

[0073] Two blind holes 6 are formed on the surface of the upper mold 1 facing the lower mold 2. The two blind holes 6 are symmetrically distributed on both sides of the annular cutting edge 3, and the line connecting the two blind holes 6 is perpendicular to the line connecting the two edge cutting edges 4. The upper end of the tension spring 7 is fixedly connected to the inner end of each blind hole 6, and the upper end of the pressure rod 8 is fixedly connected to the lower end of each tension spring 7. A groove 9 is formed at the lower end of each pressure rod 8, and each groove 9 is connected to one end of the lever 10 through a torsion spring. The angle between each lever 10 and the corresponding pressure rod 8 is 150-170°.

[0074] In specific implementation, the lever 10 has an L-shaped or J-shaped structure. It is easy to understand that the bend of the L-shaped or J-shaped structure is located outside the groove 9 and faces the edge cutting edge 4.

[0075] Each of the two blind holes 6 has a sliding groove 11 on its opposite side. The sliding groove 11 is parallel to the pressure rod 8. A slider 12 is movably installed in each sliding groove 11, and each slider 12 is fixedly connected to the corresponding pressure rod 8.

[0076] The upper mold 1 has wheel grooves 13 on both sides, each wheel groove 13 communicating with a corresponding slide groove 11. A ratchet 14 and a thread reel 15 are rotatably installed in each wheel groove 13. The ratchet 14 and the thread reel 15 are longitudinally staggered, with a portion of each ratchet 14 located outside the corresponding wheel groove 13. Each ratchet 14 is coaxially connected to a first gear 16, and each thread reel 15 is coaxially connected to a second gear 17. Two second gears 17 are located between two first gears 16, and each second gear 17 is connected to a corresponding first gear 16. Wheel 16 engages; the lower mold 2 has two discharge ports 18 on the side facing the upper mold 1, and the two discharge ports 18 are symmetrically distributed on both sides of the cavity 5; two guide wheel assemblies 19 are fixedly installed on the side of the lower mold 2 facing the upper mold 1, and each guide wheel assembly 19 is located on the side of the corresponding discharge port 18 away from the cavity 5; each slider 12 is fixedly connected to both ends of a rope 20, that is, both ends of each rope 20 are fixed to the same slider 12, and each rope 20 passes around the corresponding wheel 15 and the guide wheel assembly 19.

[0077] It should be noted that the transmission ratio between the ratchet 14 and the spool 15 is 1:2-2.5, so that the pressure rod 8 can move down twice as much when the upper mold 1 moves upward.

[0078] It should also be noted that the guide wheel assembly 19 includes a first guide wheel 191, a second guide wheel 192, an electric actuator 193, and a third guide wheel 194 with its movable end fixedly mounted. This assembly is used to tighten the rope 20 by extending or retracting the electric actuator 193 (the electric actuator 193 extends when the upper mold 1 moves downwards and retracts when the upper mold 1 moves upwards; the electric actuator 193 is connected to the press's linkage control system, triggering an extension command when the upper mold 1 moves downwards and a retraction command when it moves upwards). The first guide wheel 191 and the second guide wheel 192 are both fixedly mounted on the top surface of the lower mold 2, and the electric actuator 193 is fixedly mounted on the side of the lower mold 2 with its movable end facing downwards (the lower mold 2 and the electric actuator 193 are connected by a C-frame to avoid obstructing the rope 20). The rope 20 passes sequentially around the first guide wheel 191, the second guide wheel 192, and the third guide wheel 194.

[0079] It is easy to understand that the rope 20 is made of high-strength rope such as steel strand or steel wire rope.

[0080] The upper mold 1 is provided with ratchet racks 21 on both sides. The ratchet racks 21 can move in a direction perpendicular to the upper mold 1. Each ratchet wheel 14 can mesh with the corresponding ratchet rack 21.

[0081] In the specific implementation process, the upper mold 1 is provided with limiting boxes 22 on both sides. The limiting boxes 22 open to one side of the upper mold 1. Each ratchet 21 is located in the corresponding limiting box 22 and is connected by a spring 23. That is, the two ends of the spring 23 are respectively connected to the inner wall of the limiting box 22 and the ratchet 21.

[0082] It should be noted that the position of the limit box 22 is fixed. The limit box 22 can be fixedly connected to the ground, or it can be fixedly connected to the frame of the J21-250 open press or the JH21-250 closed press used for edge cutting. This application does not limit this.

[0083] It is easy to understand that when the upper mold 1 moves down, the ratchet 14 contacts the wedge-shaped surface of the ratchet rack 21, pressing the ratchet rack 21 to move into the limiting box 22. At this time, the spring 23 contracts and the ratchet 14 does not rotate. After the ratchet 14 passes the ratchet rack 21, the spring 23 and the ratchet rack 21 return to their original positions.

[0084] The process of removing residual edges from the target thin-walled part in the bending and forging process of the present invention is as follows: the target thin-walled part is placed in the cavity 5, with the residual edge of the target thin-walled part located outside the cavity 5. The upper mold 1 is moved downward to its limit position, and the circumferential cutting blade 3 can remove the residual edge around the target thin-walled part (the plane projection is an irregular ring, and the side projection is an L-shape). The edge cutting blade 4 cuts the residual edge into two parts (the plane projection is an irregular semi-ring, and the side projection is an L-shape). During the downward movement of the upper mold 1, the lower end of the lever 10 contacts the residual edge. The upper die 1 moves upward until it touches the edge of the ring cutting blade 3. Then, the upper die 1 moves upward, and under the elastic force of the torsion spring, the lever 10 moves downward so that the cut edge rests on the discharge port 18. The upper die 1 continues to move upward, and the ratchet 14 meshes with the ratchet rack 21. The first gear 16 and the second gear 17 drive the spool 15 to rotate, which in turn drives the pressure rod 8 to move downward through the rope 20 and the slider 12. Since the pressure rod 8 is set opposite to the discharge port 18, it can bend the half-residual edge resting on the discharge port 18 and discharge it from the discharge port 18.

[0085] In the above embodiments, the target thin-walled part can be completely separated from the residual edge, and the residual edge of the irregular structure can be divided into two. Using the power of the upper mold 1 resetting, the pressure rod 8 bends the half residual edge so that the two ends of the half residual edge come together. After bending, the longitudinal length of the half residual edge is less than the longitudinal length of the discharge port 18, so it can slide down along the discharge port 18 under the action of gravity. The residual edge can be collected by placing a receiving object below the discharge port 18. The shape of the bent half residual edge tends to be regular, and it occupies less space when stacked. No manual operation is required during the removal of the residual edge, eliminating safety hazards.

[0086] The embodiments described above are merely one preferred embodiment of the present invention. Ordinary variations and substitutions made by those skilled in the art within the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A bending and forging process for thin-walled parts, comprising: The bar stock is heated to a preset temperature to obtain a billet; The billet is forged into a flat billet; The flat blank is forged into a bowl-shaped structure in a first mold to obtain a thin-walled bowl-shaped part, wherein two opposite sidewalls of the thin-walled bowl-shaped part are rotated outward by a first preset angle, and the other two opposite sidewalls of the thin-walled bowl-shaped part are rotated inward by a second preset angle; the thin-walled bowl-shaped part is bent to obtain a thin-walled rough part, wherein the two opposite sidewalls of the thin-walled rough part are parallel; the thin-walled rough part is forged in a second mold to obtain a target thin-walled part; the target thin-walled part is subjected to edge removal in a third mold, wherein the third mold includes a movable upper mold and a fixed lower mold, the movement direction of the upper mold is perpendicular to the lower mold; the upper mold faces the lower mold. A ring-cutting blade is fixedly mounted on the face of the mold. Two side-cutting blades are fixedly mounted on opposite sides of the ring-cutting blade, both of which are located outside the ring-cutting blade, and their length direction is perpendicular to the ring-cutting blade. A cavity is formed on the face of the lower mold facing the upper mold, opposite to the ring-cutting blade. Two blind holes are formed on the face of the upper mold facing the lower mold, symmetrically distributed on both sides of the ring-cutting blade, and the line connecting the two blind holes is perpendicular to the line connecting the two side-cutting blades. The inner end of each blind hole is fixedly connected to the upper end of a tension spring, and the lower end of each tension spring is fixedly connected to the upper end of a pressure rod. A groove is formed at the lower end of each pressure rod. Each groove is connected to one end of a lever via a torsion spring, and the angle between each lever and the corresponding pressure rod is 150-170°. Slide grooves are formed on opposite sides of the two blind holes, parallel to the pressure rods. A slider is movably installed within each slide groove, and each slider is fixedly connected to the corresponding pressure rod. Wheel grooves are formed on both sides of the upper mold, each wheel groove communicating with a corresponding slide groove. A ratchet and a threaded wheel are rotatably installed within each wheel groove, with a portion of the ratchet located outside the corresponding wheel groove. Each ratchet is coaxially connected to a first gear, and each threaded wheel is coaxially connected to a second gear. The two second gears are located at the two... The first gear is connected to the second gear, and each second gear meshes with the corresponding first gear; the lower mold has two discharge ports on the side facing the upper mold, and the two discharge ports are symmetrically distributed on both sides of the cavity; two guide wheel groups are fixedly installed on the side of the lower mold facing the upper mold, and each guide wheel group is located on the side of the corresponding discharge port away from the cavity; each slider is fixedly connected to both ends of a rope, and each rope passes around the corresponding spool and the guide wheel group; ratchet racks are respectively provided on both sides of the upper mold, and the ratchet racks can move in a direction perpendicular to the upper mold, and each ratchet can mesh with the corresponding ratchet rack.

2. The thin-walled part bending and forging process according to claim 1, characterized in that, After forging the billet into a flat billet, the oxide scale of the flat billet is removed; the flat billet after removing the oxide scale is forged into a bowl-shaped structure in a first mold.

3. The thin-walled part bending and forging process according to claim 1, characterized in that, The first preset angle is 20-30°, and the second preset angle is 10-20°.

4. A bending and forging process for thin-walled parts according to any one of claims 1-3, characterized in that, The flat billet is forged into a bowl-shaped structure in a first mold, and the Y-axis pressure of the first mold is 1600-1700 tons.

5. A bending and forging process for thin-walled parts according to any one of claims 1-3, characterized in that, The thin-walled rough part is forged in a second mold, and the Y-axis pressure of the second mold is 150-180 tons.

6. The thin-walled part bending and forging process according to claim 1, characterized in that, The upper mold is provided with limiting boxes on both sides, and the limiting boxes are open on one side facing the upper mold. Each ratchet is located in the corresponding limiting box and is connected by a spring.

7. The thin-walled part bending and forging process according to claim 1, characterized in that, The lever has an L-shaped or J-shaped structure.

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