Plate forging method

Abstract

The present application relates to the field of metal plastic forming, and in particular to a plate forging method. The method comprises: forging a circular plate blank into a flanged cylindrical part; forging the flanged cylindrical part so that the material of the first cylinder wall region and the first flange region fully fills the annular unequal thickness tooth cavity of the plate forging device, thereby obtaining an unequal thickness tooth plate forging; forging the unequal thickness tooth plate forging into a cylinder wall thickening plate forging; forging the cylinder wall thickening plate forging so that the material of the third cylinder wall region fully fills the several circles of V-shaped tooth cavities and the annular protrusion cavity of the plate forging device, thereby obtaining a plate forging part. This method can reduce the risk of material buckling, improve product quality, and shorten the product process cycle.

Description

Technical Field

[0001] The present invention relates to the technical field of metal plastic forming, in particular to a plate forging method. Background Art

[0002] The metal raw material to be forged can be forged into thin-walled structures of varying wall thickness. For example, forging metal can produce components such as automotive shock absorber signal discs. These components are primarily used in automotive engine systems to transmit and measure crankshaft position and speed signals. These components absorb and dampen vibrations generated by the high-speed operation of the engine crankshaft, ensuring smoother engine operation.

[0003] The flange area of ​​the thin-walled structure of the rotating body features evenly distributed "unequal thickness teeth," the barrel wall area features annular "V-shaped teeth," and the barrel bottom area is a thin-walled structure. Existing technology for manufacturing thin-walled structures of rotating bodies primarily uses an integrated forming process, requiring more than 10 steps of steel die drawing, spinning, trimming, and shaping, and requiring numerous sets of forming molds. This not only presents complex process design, high production costs, and long processing cycles, but the spinning process also struggles to control folding defects, resulting in poor surface quality and performance of the thin-walled structure of the rotating body. Summary of the Invention

[0004] In order to solve the shortcomings of the existing technology, the present invention proposes a plate forging forming method that can improve quality.

[0005] A plate forging method, applied to a plate forging device, comprising:

[0006] Forging a cylindrical part with a flange by forging a circular slab; the circular slab is a metal raw material to be forged; the cylindrical part with a flange comprises a first bottom region, a first wall region, and a first flange region; the first bottom region is parallel to the first flange region; the first bottom region and the first flange region are respectively connected to two ends of the first wall region; and a rounded transition is formed between the first bottom region and the first wall region;

[0007] The flanged cylindrical part is forged so that the material of the first cylinder wall region and the first flange region completely fills the annular unequal thickness tooth cavity of the plate forging forming device, thereby obtaining an unequal thickness tooth plate forging; the unequal thickness tooth plate forging comprises a second cylinder bottom region, a second cylinder wall region, and a second flange region; the second cylinder bottom region is parallel to the second flange region; the second cylinder bottom region and the second flange region are respectively connected to the two ends of the second cylinder wall region; the outer edge of the second flange region is annular unequal thickness tooth shape; the height of the second cylinder wall region is less than that of the first cylinder wall region; and the second cylinder bottom region and the second cylinder wall region have a rounded transition;

[0008] Forging the unequal thickness toothed plate forging into a cylinder wall thickening plate forging; the cylinder wall thickening plate forging comprises a third cylinder bottom area, a third cylinder wall area, and a third flange area, wherein the height of the third cylinder wall area is less than that of the second cylinder wall area; the third cylinder bottom area is parallel to the third flange area; the third cylinder bottom area and the third flange area are respectively connected to two ends of the third cylinder wall area; the outer edge of the third flange area is an annular unequal thickness tooth shape; and a rounded transition is formed between the third cylinder bottom area and the third cylinder wall area;

[0009] The cylinder wall thickening plate forging is forged so that the material of the third cylinder wall area fills the several circles of V-shaped tooth cavities and the annular protrusion cavities of the plate forging forming device to obtain a plate forging forming part; the plate forging forming part includes a fourth cylinder bottom area, a fourth cylinder wall area and a fourth flange area; the fourth cylinder bottom area is parallel to the fourth flange area; the fourth cylinder bottom area and the fourth flange area are respectively connected to the two ends of the fourth cylinder wall area; the outer edge of the fourth flange area is annular unequal thickness tooth shape; there is a rounded transition between the fourth cylinder bottom area and the fourth cylinder wall area; the height of the fourth cylinder wall area is lower than the height of the third cylinder wall area; the outer wall of the fourth cylinder wall area has several circles of V-shaped teeth, and the several circles of V-shaped teeth are arranged at intervals along the axial direction of the plate forging forming part; the outer wall of the connection between the fourth cylinder wall area and the fourth cylinder bottom area is annular protrusion.

[0010] The plate forging forming method mentioned above, on the one hand, pre-forges a round plate blank into a flanged cylindrical part with a flange, and then forges the flanged cylindrical part so that the material of the first barrel wall area and the first flange area fills the annular unequal thickness tooth cavity of the plate forging forming device. During the process, the material will not curl, and an unequal thickness tooth structure is directly formed to obtain an unequal thickness tooth plate forging, which solves the folding defect problem caused by outer diameter curling and then spinning in the prior art, and greatly improves product quality. On the other hand, by forging the unequal thickness tooth plate forging into a barrel wall thickening plate forging, the barrel wall thickening plate forging can be thickened and formed in only one time, reducing the risk of material bending and folding in the third barrel wall area. The barrel wall thickening plate forging is then forged so that the material of the third barrel wall area fills the several circles of V-shaped tooth cavities and the annular protrusion cavity of the plate forging forming device, and a plate forging forming part is obtained, which shortens the process debugging cycle, and the finished part has high strength and good dimensional accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0012] Figure 1 A three-dimensional schematic diagram of a plate forging part in one embodiment;

[0013] Figure 2 A perspective cross-sectional view of a plate forging part in one embodiment;

[0014] Figure 3 A schematic diagram of a circular slab in one embodiment;

[0015] Figure 4 is a perspective cross-sectional view of a cylindrical member with a flange in one embodiment;

[0016] Figure 5 is a three-dimensional cross-sectional view of a tooth plate forging of unequal thickness in one embodiment;

[0017] Figure 6 A three-dimensional cross-sectional view of a cylinder wall thickening plate forging in one embodiment;

[0018] Figure 7 A perspective sectional view of a plate forging part in another embodiment;

[0019] Figure 8 Schematic diagram of a preforming die for a cylindrical part with a flange in one embodiment;

[0020] Figure 9 A schematic diagram of a process for forming a cylindrical member with a flange in one embodiment;

[0021] Figure 10 for Figure 9 A magnified schematic diagram of point A in the middle;

[0022] Figure 11 Schematic diagram of a forging die for a final-formed plate with unequal-thickness teeth in one embodiment;

[0023] Figure 12 A schematic diagram of a forming process of a tooth plate forging with unequal thickness according to an embodiment;

[0024] Figure 13 for Figure 11 A magnified schematic diagram of point B in the middle;

[0025] Figure 14 is a three-dimensional cross-sectional view of a first pressing plate in one embodiment;

[0026] Figure 15 is a three-dimensional cross-sectional view of a first die in one embodiment;

[0027] Figure 16 is a three-dimensional cross-sectional view of a first lower punch in one embodiment;

[0028] Figure 17 Schematic diagram of a forging die for a preformed plate with thickened barrel wall in one embodiment;

[0029] Figure 18 Schematic diagram of the process of forming a cylinder wall thickening plate forging in one embodiment;

[0030] Figure 19 is a three-dimensional cross-sectional view of a second pressing plate in one embodiment;

[0031] Figure 20 is a three-dimensional cross-sectional view of a second die in one embodiment;

[0032] Figure 21 is a three-dimensional cross-sectional view of the second lower punch in one embodiment;

[0033] Figure 22 for Figure 17 The enlarged schematic diagram of point C in the middle;

[0034] Figure 23 Schematic diagram of a forging die for a final-forming plate of a cylinder wall V-shaped tooth in one embodiment;

[0035] Figure 24 A schematic diagram of a forming process of a plate forging part in one embodiment;

[0036] Figure 25 is a three-dimensional cross-sectional view of a third pressing plate in one embodiment;

[0037] Figure 26 is a three-dimensional cross-sectional view of a third die in one embodiment;

[0038] Figure 27 It is a three-dimensional cross-sectional view of the third lower punch in one embodiment.

[0039] Figure Number:

[0040] 1. Pre-forming die for flanged cylindrical parts; 2. Forging die for final-forming plate with unequal-thickness teeth; 3. Forging die for pre-forming plate with thickened cylinder wall; 4. Forging die for final-forming plate with V-shaped teeth on cylinder wall;

[0041] 11. Drawing punch; 12. Blank holder; 13. Drawing die; 14. First upper cylinder of the first press; 15. Second upper cylinder of the first press;

[0042] 21. First upper punch; 22. First pressing plate; 221. Step surface of first pressing plate; 222. External tooth surface of first pressing plate; 223. Bottom surface of first pressing plate; 224. Fillet of first pressing plate; 225. Inner surface of first pressing plate; 23. First die; 231. Upper top surface of first die; 232. Internal tooth surface of first die; 233. Step surface of first die; 234. Inner surface of first die; 24. First lower punch; 241. Fillet of first lower punch; 242. Step surface of first lower punch; 243. External surface of first lower punch; 25. First upper cylinder of second press; 26. Second upper cylinder of second press; 27. Lower cylinder of second press;

[0043] 31. Second upper punch; 32. Second pressing plate; 321. Step surface of second pressing plate; 322. External tooth surface of second pressing plate; 323. Bottom surface of second pressing plate; 324. Fillet of second pressing plate; 325. Inner surface of second pressing plate; 33. Second die; 331. Upper top surface of second die; 332. Internal tooth surface of second die; 333. Step surface of second die; 334. Inner surface of second die; 34. Second lower punch; 341. Fillet of second lower punch; 342. Step surface of second lower punch; 343. External surface of second lower punch; 35. First upper cylinder of third press; 36. Second upper cylinder of third press; 37. Lower cylinder of third press;

[0044] 41. Third upper punch; 42. Third pressing plate; 421. Step surface of third pressing plate; 422. External tooth surface of third pressing plate; 423. Bottom surface of third pressing plate; 424. Fillet of third pressing plate; 425. Inner surface of third pressing plate; 43. Third die; 431. Upper top surface of third die; 432. Inner tooth surface of third die; 433. Step surface of third die; 434. Inner surface of third die; 4341. V-shaped surface of third die; 4342. Inner cylindrical surface of third die; 44. Third lower punch; 441. Step surface of third lower punch; 442. Fillet of third lower punch; 443. External surface of third lower punch; 45. First upper cylinder of fourth press; 46. Second upper cylinder of fourth press; 47. Lower cylinder of fourth press;

[0045] 51. Round slab; 52. Flanged cylindrical parts; 53. Uneven thickness toothed plate forgings; 54. Cylinder wall thickening plate forgings; 55. Plate forging parts;

[0046] A. First gap; B. Annular cavity with unequal tooth thickness; C. Second gap. DETAILED DESCRIPTION

[0047] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0048] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "periphery", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0050] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0051] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0052] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0053] In order to more clearly understand the above-mentioned purposes, features and advantages of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0054] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0055] Figure 1 The figure shows a three-dimensional diagram of the plate forging part 55. The plate forging part 55 is generally cylindrical with a flange. The fourth flange area 553 has evenly distributed annular teeth of unequal thickness. The fourth cylinder wall area 552 has several circles of V-shaped teeth and annular protrusions. The fourth cylinder bottom area 551 has a stepped surface with rounded transition.

[0056] Figure 2 Shown is a perspective cross-sectional view of a plate forging part 55.

[0057] The following is Figure 1 The specific embodiment of the plate forging forming method of the plate forging forming part 55 is shown in FIG. The plate forging forming method of the present invention is preferably a cold forming process, and can also be a hot forming process:

[0058] S1 , forging a circular slab 51 into a cylindrical member 52 with a flange.

[0059] The circular slab 51 is a metal raw material to be forged, preferably a metal raw material with a yield strength of no more than 200 MPa, such as aluminum alloy or low-carbon steel. The flanged cylindrical member 52 includes a first bottom area 521, a first wall area 522, and a first flange area 523. The first bottom area 521 is parallel to the first flange area 523. The first bottom area 521 and the first flange area 523 are respectively connected to the two ends of the first wall area 522. There is a rounded transition between the first bottom area 521 and the first wall area 522. Figure 3 As shown, the three-dimensional cross-sectional view of the flanged cylindrical member 52 is as shown in FIG. Figure 4 shown.

[0060] S2, forging the flanged cylindrical part 52 so that the materials of the first cylinder wall area 522 and the first flange area 523 fill the annular unequal thickness tooth cavity of the plate forging forming device, thereby obtaining an unequal thickness tooth plate forging 53.

[0061] The unequal thickness toothed plate forging 53 includes a second bottom section 531, a second wall section 532, and a second flange section 533. The second bottom section 531 is parallel to the second flange section 533. The second bottom section 531 and the second flange section 533 are connected to the two ends of the second wall section 532, respectively. The outer edge of the second flange section 533 is an annular unequal thickness toothed shape. The height of the second wall section 532 is less than that of the first wall section 522. There is a rounded transition between the second bottom section 531 and the second wall section 532. A three-dimensional cross-sectional view of the unequal thickness toothed plate forging 53 is shown in FIG. Figure 5 shown.

[0062] S3, forging the unequal thickness tooth plate forging 53 into a cylinder wall thickened plate forging 54.

[0063] The wall thickening plate forging 54 includes a third bottom section 541, a third wall section 542, and a third flange section 543. The height of the third wall section 542 is less than that of the second wall section 532. The third bottom section 541 and the third flange section 543 are parallel to each other. The third bottom section 541 and the third flange section 543 are connected to the ends of the third wall section 542, respectively. The outer edge of the third flange section 543 is an annular tooth shape with uneven thickness. The third bottom section 541 and the third wall section 542 have a rounded transition. A three-dimensional cross-sectional view of the wall thickening plate forging 54 is shown in FIG. Figure 6 shown.

[0064] S4, forging the cylinder wall thickened plate forging 54 so that the material of the third cylinder wall area 542 is fully filled with several circles of V-shaped tooth cavities and the annular protrusion cavity of the plate forging forming device, thereby obtaining a plate forging forming part 55.

[0065] Among them, the plate forging part 55 is a thin-walled structure of a rotating body with unequal wall thickness. The plate forging part 55 includes a fourth bottom area 551, a fourth wall area 552 and a fourth flange area 553; the fourth bottom area 551 is parallel to the fourth flange area 553; the fourth bottom area 551 and the fourth flange area 553 are respectively connected to the two ends of the fourth wall area 552; the outer edge of the fourth flange area 553 is an annular tooth shape with unequal thickness; there is a rounded transition between the fourth bottom area 551 and the fourth wall area 552; the height of the fourth wall area 552 is lower than the height of the third wall area 542; the outer wall of the fourth wall area 552 has a plurality of circles of V-shaped teeth, and the plurality of circles of V-shaped teeth are arranged at intervals along the axial direction of the plate forging part 55; the outer wall of the connection between the fourth wall area 552 and the fourth bottom area 551 is an annular protrusion. The three-dimensional cross-sectional view of the plate forging part 55 is shown as follows. Figure 7 shown.

[0066] In some embodiments, the fourth bottom area 551 of the plate forging part 55 is not limited to being stepped, but may be flat, and the shapes of the bottom areas at each stage are not limited to being completely consistent.

[0067] In one embodiment, the plate forging forming device includes a flanged cylindrical part preforming mold 1, and the flanged cylindrical part preforming mold 1 includes a drawing punch 11, a blank holder 12, a drawing die 13, a first upper cylinder 14 of a first press and a second upper cylinder 15 of a first press; the drawing punch 11 is connected to the second upper cylinder 15 of the first press, and the blank holder 12 is connected to the first upper cylinder 14 of the first press; the drawing die 13 is a cylinder with a pit in the middle; the drawing punch 11 is a cylinder that allows it to move up and down in the pit of the drawing die 13, and the blank holder 12 is located at the outer edge of the top of the drawing die 13. Forging the round slab 51 into a flanged cylindrical part 52 includes: placing the round slab 51 with uniform thickness in the center on the flange plane of the drawing die 13, and controlling the first upper cylinder 14 of the first press to apply a blanking force to the blank holder 12 to press the outer edge of the round slab 51 against the flange plane of the drawing die 13; controlling the second upper cylinder 15 of the first press to push the drawing punch 11 downward to draw the round slab 51 into the first cavity to obtain a flanged cylindrical part 52 with uniform wall thickness; the first cavity is surrounded by the drawing punch 11, the blank holder 12 and the drawing die 13.

[0068] Among them, the side surface of the drawing punch 11 is a cylindrical surface, the side diameter is the inner diameter of the cylindrical surface in the fourth cylinder wall area 552, the bottom surface of the drawing punch 11 has a step with a stepped arc transition, and there is a rounded corner transition between the bottom surface and the side surface of the drawing punch 11; the drawing die 13 is a cylinder with a cylindrical pit in the center, the bottom surface of the pit of the drawing die 13 has a step with a stepped arc transition, and there is a rounded corner transition between the bottom surface of the pit of the drawing die 13 and the side surface of the pit. Figure 8 Shown is a preforming die 1 for a cylindrical part with a flange. Figure 9 The figure shows a schematic diagram of the process of forming a cylindrical part with a flange.

[0069] In this embodiment, the drawing die 13 is fixedly mounted on the lower support platform of the first press. During the preforming process of the flanged cylindrical part 52, the circular slab 51 is first placed on the flange plane of the drawing die 13, and the center of the circular slab 51 is placed coaxially with the drawing die 13. When the mold is closed, the blank holder 12 is driven downward by the first upper cylinder 14 of the first press. When the outer edge of the circular slab 51 is pressed against the flange plane of the drawing die 13 and a certain pressing force is applied, the first upper cylinder 14 of the first press stops descending. Subsequently, the second upper cylinder 15 of the first press drives the drawing punch 11 downward and generates a drawing force. Under the action of the drawing force, the circular slab 51 is slowly filled into the first cavity. The second upper cylinder 15 of the first press stops descending and maintains pressure for a certain period of time to obtain the flanged cylindrical part 52.

[0070] In one embodiment, the drawing punch 11 is coaxial with the drawing die 13. Controlling the second upper cylinder 15 of the first press to push the drawing punch 11 downward includes: controlling the second upper cylinder 15 of the first press to push the drawing punch 11 downward until the thickness of the first gap A between the drawing punch 11 and the drawing die 13 reaches a target value; the target value is equal to a first multiple of the thickness of the circular slab 51; and controlling the second upper cylinder 15 of the first press to stop downward movement and maintain pressure for a first preset time.

[0071] When the mold is closed, a gap is formed between the drawing punch 11 and the drawing die 13. Figure 9 The first gap A at A in the middle, the first gap A is as follows Figure 10 The thickness of the first gap A is a target value, which is a first multiple of the thickness of the circular slab 51. For example, the first gap A is 1.2 times the thickness of the circular slab 51.

[0072] Furthermore, the second upper cylinder 15 of the first press drives the drawing punch 11 downward and generates a drawing force. Under the action of the drawing force, the circular plate blank 51 is slowly filled into the cavity of the first gap A. When the drawing punch 11 descends to a distance separated from the drawing die 13 by the first gap A, the second upper cylinder 15 of the first press stops descending and maintains the pressure for a certain period of time. Finally, a cylindrical part 52 with a flange is obtained.

[0073] In one embodiment, the plate forging forming device includes a plate forging die 2 with a final forming structure of unequal thickness teeth. Figure 11Shown is a forging die 2 for a final-forming plate with unequal thickness teeth. The forging die 2 for the final forming plate of the unequal thickness tooth profile includes a first upper punch 21, a first pressing plate 22, a first die 23, a first lower punch 24, a first upper cylinder 25 of the second press, a second upper cylinder 26 of the second press and a lower cylinder 27 of the second press; the first upper punch 21 is connected to the second upper cylinder 26 of the second press, the first pressing plate 22 is connected to the first upper cylinder 25 of the second press, and the first lower punch 24 is connected to the lower cylinder 27 of the second press; the middle of the first die 23 is a pit, and the top is a step with a stepped transition; the bottom of the pit of the first die 23 is the first lower punch 24 that allows up and down movement, and the outer wall of the first lower punch 24 is slidably fitted with the inner wall of the first die 23; the first upper punch 21 is a cylinder that allows up and down movement in the pit of the first die 23, and the first pressing plate 22 is clearance-fitted with the step of the first die 23; the outer edges of the first pressing plate 22, the first die 23 and the first flange area 523 form an annular unequal thickness tooth cavity.

[0074] The flanged cylindrical part 52 is forged so that the materials of the first cylinder wall area 522 and the first flange area 523 fill the annular unequal thickness tooth cavity of the plate forging forming device to obtain the unequal thickness tooth plate forging 53, including: placing the flanged cylindrical part 52 in the cavity of the first die 23, and controlling the first upper cylinder 25 of the second press to push the first pressing plate 22 downward to press the first flange area 523 onto the step flange plane of the first die 23; controlling the lower cylinder 27 of the second press to push the first lower punch 24, the first upper punch 21, and the first cylinder bottom area 521 upward, and at the same time, controlling the second upper cylinder 26 of the second press to A load is applied to the first upper punch 21 to clamp the first barrel bottom area 521; when the first barrel bottom area 521 is clamped, the second press lower cylinder 27 is controlled to continue to move upward, and the first lower punch 24, the first upper punch 21 and the first barrel bottom area 521 continue to move upward. The first barrel wall area 522 and the first flange area 523 are squeezed by the first lower punch 24, the first upper punch 21, the first die 23 and the first pressure plate 22 and produce plastic deformation. The height of the first barrel wall area 522 becomes smaller, and the materials of the first barrel wall area 522 and the first flange area 523 fill the annular unequal thickness tooth cavity to obtain an unequal thickness tooth plate forging 53.

[0075] The first die 23 is fixedly mounted on the lower support platform of the second press. Figure 12 Shown is a schematic diagram of the forming process of unequal thickness tooth plate forgings.

[0076] During the mold closing process, the flanged cylindrical part 52 is placed in the cavity of the first die 23. The first upper cylinder 25 of the second press pushes the first pressure plate 22 to press the first flange area 523 against the stepped flange plane of the first die 23. The lower cylinder 27 of the second press pushes the first lower punch 24 upward. At the same time, the second upper cylinder 26 of the second press pushes the first upper punch 21 downward to clamp the first cylinder bottom area, thus completing the mold closing. After the mold closing, the first pressure plate 22 and the first die 23 will form the following Figure 11 The annular unequal thickness tooth cavity shown at B in the figure is as follows: Figure 13 As shown. A shape similar to the following is formed between the first concave mold 23 and the first upper convex mold 21. Figure 9 The first gap A is shown at A in the middle. During the final forming process of the annular unequal thickness teeth in the first flange area 523, the second press lower cylinder 27 pushes the first lower punch 24 upward, and drives the first upper punch 21 and the first barrel bottom area 521 upward together. During the process of the second press lower cylinder 27 pushing the first lower punch 24 upward, the second press second upper cylinder 26 still applies a certain load downward to the first upper punch 21 to clamp the first barrel bottom area 521. As the second press lower cylinder 27 continues to move upward, the first lower punch 24, the first upper punch 21 and the first barrel bottom area 521 continue to move upward, and the first barrel wall Area 522 and the first flange area 523 are squeezed by the first lower punch 24, the first upper punch 21, the first die 23 and the first pressure plate 22 and produce plastic deformation. The materials of the first cylinder wall area 522 and the first flange area 523 are slowly pushed into the annular unequal thickness tooth cavity. The height of the first cylinder wall area 522 continues to decrease, and the annular unequal thickness teeth of the first flange area 523 are slowly formed. When the annular unequal thickness tooth cavity is completely filled, the second upper cylinder 26 of the second press and the lower cylinder 27 of the second press stop ascending and maintain pressure for a certain time to obtain the unequal thickness tooth plate forging 53.

[0077] In one embodiment, the first pressure plate 22 is as follows Figure 14 As shown. The first pressing plate 22 includes a first pressing plate step surface 221, a first pressing plate outer tooth surface 222, a first pressing plate bottom surface 223, a first pressing plate fillet 224, and a first pressing plate inner surface 225. The first pressing plate step surface 221 is perpendicularly connected to the first pressing plate outer tooth surface 222. The number and shape of the unequal thickness teeth on the first pressing plate outer tooth surface 222 are consistent with the number and shape of the unequal thickness teeth on the outer edge of the second flange area 533. The first pressing plate bottom surface 223 is perpendicularly connected to the first pressing plate outer tooth surface 222. The first pressing plate inner surface 225 is perpendicular to the first pressing plate bottom surface 223. The transition between the first pressing plate bottom surface 223 and the first pressing plate inner surface 225 is the first pressing plate fillet 224. The first pressing plate fillet 224 is an outwardly convex fillet. The lower end of the outer tooth surface 222 of the first pressing plate has a concave step; the inner surface 225 of the first pressing plate is a cylindrical surface; the shape of the first pressing plate fillet 224 is consistent with the fillet between the first flange area 523 and the first barrel wall area 522.

[0078] In one embodiment, the first die 23 is as follows Figure 15 As shown, the first die 23 includes a first die top surface 231, a first die inner tooth surface 232, a first die step surface 233 and a first die inner surface 234; the two ends of the first die step surface 233 are respectively connected to the first die top surface 231 and the first die inner tooth surface 232; the connection between the first die step surface 233 and the first die inner tooth surface 232 is a tooth-shaped plane with pits; the first die inner surface 234 is a cylindrical surface, and the first die inner surface 234 and the first die step surface 233 are connected by a fillet transition; the first pressure plate outer tooth surface 222 and the first die inner tooth surface 232 are clearance-fitted; the inner diameter of the first die inner surface 234 is smaller than the inner diameter of the first die top surface 231. The upper top surface 231 of the first die is annular, and is vertically connected to the inner tooth surface 232 of the first die; the inner tooth surface 232 of the first die is engaged with the outer tooth surface 222 of the first pressure plate with a small gap, and the first pressure plate 22 can slide up and down along the inner tooth surface 232 of the first die; the first die step surface 233 is vertically connected to the inner tooth surface 232 of the first die, and the position of the vertical corner is a tooth-shaped plane with a pit; the inner surface 234 of the first die is perpendicular to the step surface 233 of the first die, and the corner is a rounded transition.

[0079] In one embodiment, the first lower punch 24 is as follows Figure 16 As shown, the first lower punch 24 includes a first lower punch fillet 241, a first lower punch step surface 242, and a first lower punch outer surface 243. The first lower punch fillet 241 is an upwardly protruding annular arc-shaped structure, and its shape is consistent with the fillet shape of the outer side of the first barrel bottom area 521. The first lower punch step surface 242 is composed of two parallel planes with an arc transition between the two parallel planes. The first lower punch outer surface 243 is a cylindrical surface and is perpendicular to the first lower punch step surface 242. The shape of the first lower punch fillet 241 is consistent with the outer fillet shape connecting the first barrel bottom area 521 and the first barrel wall area 522.

[0080] In some embodiments, during the mold closing process, the first upper cylinder 25 of the second press pushes the first pressure plate 22 to press the first flange area 523 onto the first die step surface 233, and the lower cylinder 27 of the second press pushes the first lower punch 24 upward. At the same time, the second upper cylinder 26 of the second press pushes the first upper punch 21 downward to clamp the first barrel bottom area 521, thereby completing the mold closing.

[0081] In some embodiments, the plate forging device includes a cylinder wall thickening preformed plate forging die 3, the cylinder wall thickening preformed plate forging die 3 is as follows: Figure 17The forging die 3 for the thickened preformed plate of the cylinder wall comprises a second upper punch 31, a second pressing plate 32, a second die 33, a second lower punch 34, a first upper cylinder 35 of a third press, a second upper cylinder 36 of a third press and a lower cylinder 37 of a third press; the second upper punch 31 is connected to the second upper cylinder 36 of the third press, the second pressing plate 32 is connected to the first upper cylinder 35 of the third press, and the second lower punch 34 is connected to the lower cylinder 37 of the third press; the middle of the second die 33 is a pit, and the top is a step of a stepped transition; the bottom of the pit of the second die 33 is the second lower punch 34 that allows upward and downward movement, and the outer wall of the second lower punch 34 is slidably fitted with the inner wall of the second die 33; the second upper punch 31 is a cylinder that allows upward and downward movement in the pit of the second die 33, and the second pressing plate 32 is clearance-fitted with the step of the second die 33; the outer edge of the second pressing plate 32, the second die 33 and the second flange area 533 form an annular tooth cavity of unequal thickness.

[0082] Forging the unequal thickness toothed plate forging 53 into a cylinder wall thickening plate forging 54 includes: placing the unequal thickness toothed plate forging 53 in the cavity of the second die 33, and controlling the first upper cylinder 35 of the third press to push the second pressing plate 32 downward to press the second flange area 533 onto the step flange plane of the second die 33; controlling the lower cylinder 37 of the third press to push the second lower punch 34, the second upper punch 31, and the second cylinder bottom area 531 upward, and at the same time controlling the second upper cylinder 36 of the third press to apply a load downward to the second upper punch 31, so that the second cylinder bottom area 531 is clamped, so that the material of the second cylinder wall area 532 fills the second cavity, and obtains the cylinder wall thickening plate forging 54; the second cavity is surrounded by the second die 33 and the unequal thickness toothed plate forging 53, and the thickness of the third cylinder wall area 542 is greater than the thickness of the second cylinder wall area 532. The forming process of the cylinder wall thickening plate forging is as follows Figure 18 shown.

[0083] In one embodiment, the second upper punch 31 is coaxial with the second die 33 and the second lower punch 34. Figure 19 As shown, the second pressure plate 32 includes a second pressure plate step surface 321, a second pressure plate outer tooth surface 322, a second pressure plate bottom surface 323, a second pressure plate fillet 324 and a second pressure plate inner surface 325; the second pressure plate step surface 321 is vertically connected to the second pressure plate outer tooth surface 322; the number and shape of the unequal thickness teeth on the second pressure plate outer tooth surface 322 are consistent with the number and shape of the unequal thickness teeth on the outer edge of the second flange area 533; the second pressure plate bottom surface 323 is vertically connected to the second pressure plate outer tooth surface 322; the second pressure plate inner surface 325 is perpendicular to the second pressure plate bottom surface 323; the transition between the second pressure plate bottom surface 323 and the second pressure plate inner surface 325 is the second pressure plate fillet 324; the second pressure plate fillet 324 is a fillet convex outward.

[0084] In one embodiment, the second die 33 is as follows Figure 20As shown, the second die 33 includes a second die top surface 331, a second die inner tooth surface 332, a second die step surface 333, and a second die inner surface 334; the second die top surface 331 is consistent in shape and size with the first die top surface 231; the second die inner tooth surface 332 is consistent in shape and size with the first die inner tooth surface 232; the second die step surface 333 is consistent in shape with the first die step surface 233, and the inner diameter of the second die step surface 333 is larger than that of the first die step surface 233. Inner diameter; the inner diameter of the second die inner surface 334 is smaller than the inner diameter of the second die upper top surface 331; the second die step surface 333 is perpendicular to the second die inner tooth surface 332, and the connection between the second die step surface 333 and the second die inner tooth surface 332 is a tooth-shaped plane with pits; the second die inner surface 334 is a cylindrical surface, and the second die inner surface 334 and the second die step surface 333 are connected by a rounded transition; the second pressure plate outer tooth surface 322 and the second die inner tooth surface 332 are clearance-fitted.

[0085] In one embodiment, the second lower punch 34 is as follows Figure 21 As shown, the second lower punch 34 includes a second lower punch radius 341, a second lower punch step surface 342 and a second lower punch outer surface 343; the second lower punch radius 341 is an upwardly protruding annular arc-shaped structure; the second lower punch step surface 342 is similar in shape to the first lower punch step surface 242, and the circular diameter of the outer edge of the second lower punch step surface 342 is larger than the circular diameter of the outer edge of the first lower punch step surface 242; the second lower punch outer surface 343 and the second die inner surface 334 are clearance-fitted; the second lower punch step surface 342 is composed of two parallel planes, and there is an arc transition between the two parallel planes; the second lower punch outer surface 343 is a cylindrical surface, and the second lower punch outer surface 343 is perpendicular to the second lower punch step surface 342.

[0086] In one embodiment, the second die 33 is fixedly mounted on the lower support platform of the third press. When closing the mold, the first upper cylinder 35 of the third press pushes the second pressing plate 32 to press the second flange area 533 against the second die step surface 333, and the second upper cylinder 36 of the third press pushes the second upper punch 31 downward. At the same time, the lower cylinder 37 of the third press pushes the second lower punch 34 upward to clamp the second barrel bottom area 531, thus completing the mold closing. After closing the mold, the second die 33 and the second upper punch 31 form a Figure 17 The second gap C at C in the middle, the enlarged schematic diagram of the second gap C is as follows Figure 22 As shown. The second gap C should be larger than Figure 10After the mold is closed, the unequal thickness tooth plate forging 53 is close to the side wall of the second upper punch 31 and forms a second cavity with the second die 33. During the pre-forming stage of thickening the barrel wall, the lower cylinder 37 of the third press pushes the second lower punch 34 upward, and drives the second upper punch 31 and the second barrel bottom area 531 upward together, and the second upper cylinder 36 of the third press still applies a certain load downward to the second upper punch 31; as the lower cylinder 37 of the third press continues to ascend, the second lower punch 34, the second upper punch 31 and the second barrel bottom area 531 continue to ascend, and the second barrel wall area 532 is squeezed by the second upper punch 31, the second lower punch 34, the second die 33 and the second pressing plate 32 and produces plastic deformation. The material of the second barrel wall area 532 slowly fills the second cavity, and the height of the second barrel wall area 532 continues to decrease. When the second cavity is completely filled with material, the second upper cylinder 36 of the third press and the lower cylinder 37 of the third press stop moving and maintain pressure for a certain time to obtain the barrel wall thickening plate forging 54.

[0087] In one embodiment, the plate forging device includes a cylinder wall V-shaped tooth final forming plate forging die 4, the cylinder wall V-shaped tooth final forming plate forging die 4 is as follows: Figure 23 As shown in the figure, the forming process of plate forging parts is as follows Figure 24 The forging die 4 for the final V-shaped plate of the cylinder wall comprises a third upper punch 41, a third pressing plate 42, a third die 43, a third lower punch 44, a first upper cylinder 45 of a fourth press, a second upper cylinder 46 of a fourth press, and a lower cylinder 47 of a fourth press; the third upper punch 41 is connected to the second upper cylinder 46 of the fourth press, the third pressing plate 42 is connected to the first upper cylinder 45 of the fourth press, the third lower punch 44 is connected to the lower cylinder 47 of the fourth press; the third die 43 There is a pit in the middle and a step with a stepped transition on the top; the bottom of the pit of the third die 43 is the third lower punch 44 that allows up and down movement, and the outer wall of the third lower punch 44 slides with the inner wall of the third die 43; the third upper punch 41 is a cylinder that allows up and down movement in the pit of the third die 43, and the third pressure plate 42 is clearance-fitted with the step of the third die 43; the outer edges of the third pressure plate 42, the third die 43 and the third flange area 543 form an annular tooth cavity of unequal thickness; the inner wall of the third die 43 has several circles of V-shaped tooth cavities and annular protrusion cavities, and several circles of V-shaped tooth cavities are arranged at axial intervals along the inner wall of the third die 43; the annular protrusion cavity is arranged along the bottom of the inner wall of the third die 43.

[0088] The forging of the cylinder wall thickening plate forging 54 is performed so that the material of the third cylinder wall area 542 fills the several circles of V-shaped tooth cavities and the annular protrusion cavity of the plate forging forming device to obtain the plate forging forming part 55, including: placing the cylinder wall thickening plate forging 54 in the cavity of the third die 43, and controlling the first upper cylinder 45 of the fourth press to push the third press plate 42 downward to press the third flange area 543 tightly against the stepped flange plane of the third die 43; controlling the fourth press The lower cylinder 47 pushes the third lower punch 44, the third upper punch 41, and the third barrel bottom area 541 upward. At the same time, the second upper cylinder 46 of the fourth press is controlled to apply a load downward to the third upper punch 41, so that the third barrel bottom area 541 is clamped, and the material of the third barrel wall area 542 is filled with several circles of V-shaped tooth cavities and annular protrusion cavities to obtain a plate forging part 55; several circles of V-shaped tooth cavities and annular protrusion cavities are surrounded by the third die 43 and the third barrel wall area 542.

[0089] In one embodiment, Figure 25 As shown, the third pressure plate 42 includes a third pressure plate step surface 421, a third pressure plate outer tooth surface 422, a third pressure plate bottom surface 423, a third pressure plate fillet 424 and a third pressure plate inner surface 425; the third pressure plate step surface 421 is vertically connected to the third pressure plate outer tooth surface 422; the number and shape of the unequal thickness teeth on the third pressure plate outer tooth surface 422 are consistent with the number and shape of the unequal thickness teeth on the outer edge of the second flange area 533; the third pressure plate bottom surface 423 is vertically connected to the third pressure plate outer tooth surface 422; the third pressure plate inner surface 425 is perpendicular to the third pressure plate bottom surface 423; the transition between the third pressure plate bottom surface 423 and the third pressure plate inner surface 425 is the third pressure plate fillet 424; the third pressure plate fillet 424 is a fillet convex outward.

[0090] In one embodiment, Figure 26 As shown, the third die 43 includes a third die upper top surface 431, a third die inner tooth surface 432, a third die step surface 433 and a third die inner surface 434; the third die inner surface 434 includes a third die V-shaped surface 4341 and a third die inner cylindrical surface 4342, and the third die V-shaped surface 4341 is consistent with the V-shaped tooth profile of the fourth barrel wall area 552; the third lower punch 44 includes a third lower punch step surface 441, a third lower punch radius 442 and a third lower punch outer surface 443; the third lower punch outer surface 443 and the third die inner cylindrical surface 4342 are clearance fitting surfaces.

[0091] Among them, the top surface 431 of the third die is a circular surface, and the tooth structure is evenly distributed along the inner circle; the inner tooth surface 432 of the third die is a uniformly distributed tooth surface, and the inner tooth surface 432 of the third die is perpendicular to the top surface 431 of the third die; the step surface 433 of the third die is a circular step surface, and the sunken tooth structure is evenly distributed along the outer circle, and the step surface 433 of the third die is parallel to the top surface 431 of the third die; the inner surface 434 of the third die includes a third die V-shaped surface 4341 and a third die inner cylindrical surface 4342; the third die V-shaped surface 4341 has an annular V-shaped tooth structure and an annular protrusion structure, and the third die V-shaped surface 4341 and the third die inner cylindrical surface 4342 are coaxial.

[0092] In one embodiment, Figure 27 As shown, the third lower punch 44 includes a third lower punch step surface 441, a third lower punch fillet 442 and a third lower punch outer surface 443; the third lower punch fillet 442 is an upwardly protruding annular arc-shaped structure, and the shape of the third lower punch fillet 442 is consistent with the fillet shape on the outer side of the third barrel bottom area 541; the third lower punch step surface 441 is composed of two parallel planes, and there is an arc transition between the two parallel planes; the third lower punch outer surface 443 is a cylindrical surface, and the third lower punch outer surface 443 is perpendicular to the third lower punch step surface 441.

[0093] The step surface 441 of the third lower punch is similar in shape to the step surface 242 of the first lower punch; the fillet 442 of the third lower punch is a conical surface, and the conical surface of the fillet 442 of the third lower punch and the V-shaped surface 4341 of the third die form an annular raised cavity; the outer surface 443 of the third lower punch and the inner cylindrical surface 4342 of the third die are clearance-fitted.

[0094] In one embodiment, the third die 43 is fixedly mounted on the lower support platform of the fourth press. The third lower punch 44 is movable up and down along the inner cylindrical surface 4342 of the third die. During mold closing, the first upper cylinder 45 of the fourth press pushes the third pressure plate 42 to press the third flange area 543 against the step surface 433 of the third die. The second upper cylinder 46 of the fourth press pushes the third upper punch 41 downward. Simultaneously, the lower cylinder 47 of the fourth press pushes the third lower punch 44 upward to clamp the third barrel bottom area 541, completing the mold closing. After mold closing, a cavity with several V-shaped teeth and an annular raised cavity are formed between the third die 43, the third lower punch 44, and the barrel wall thickening plate forging 54. A circular angled cavity is formed above the rounded corner 442 of the third lower punch by the third die 43, the third lower punch 44, and the barrel wall thickening plate forging 54. This cavity forms a portion of the annular raised cavity. During the final forming process of the thickening of the V-shaped tooth of the cylinder wall, the lower cylinder 47 of the fourth press pushes the third lower punch 44 upward, and drives the third upper punch 41 and the third cylinder bottom area 541 upward together, and the second upper cylinder 46 of the fourth press still applies a certain load downward to the third upper punch 41; as the lower cylinder 47 of the fourth press continues to move upward, the third lower punch 44, the third upper punch 41 and the third cylinder bottom area 541 continue to move upward, and the third cylinder wall area 542 is squeezed by the third upper punch 41, the third die 43, the third lower punch 44 and the third pressure plate 42 and produces plastic deformation. The material of the third cylinder wall area 542 is slowly filled into the V-shaped tooth cavity and the annular protrusion cavity, and the height of the third cylinder wall area 542 is continuously reduced. When the two cavities are completely filled with material, the second upper cylinder 46 of the fourth press and the lower cylinder 47 of the fourth press both stop moving and maintain pressure for a certain time, thereby obtaining a plate forging forming part 55 with thickened cylinder wall.

[0095] Furthermore, during the research and development process, the applicant discovered that if the circular plate blank 51 is directly forged into the plate forging part 55 in one step, this will lead to the following technical problems:

[0096] 1) The unequal thickness teeth in the fourth flange area and the V-shaped teeth in the fourth barrel wall area of ​​the plate forging parts are not fully filled;

[0097] 2) Excessive plate forging force may cause the die to crack.

[0098] Therefore, after many adjustments to the process methods and experiments, the applicant finally developed the above-mentioned step-by-step plate forging forming method, which can significantly reduce the forming force, is conducive to the material filling the mold cavity, and has the best process steps.

Claims

1. A plate forging method, applied to a plate forging device, characterized in that: The method comprises: A circular plate blank (51) is forged into a flanged cylindrical part (52); the circular plate blank (51) is a metal raw material to be forged; the flanged cylindrical part (52) includes a first cylinder bottom area (521), a first cylinder wall area (522) and a first flange area (523); the first cylinder bottom area (521) is parallel to the first flange area (523); the first cylinder bottom area (521) and the first flange area (523) are respectively connected to the two ends of the first cylinder wall area (522); a rounded transition is formed between the first cylinder bottom area (521) and the first cylinder wall area (522); The flanged cylindrical part (52) is forged so that the materials of the first cylinder wall area (522) and the first flange area (523) fill the annular unequal thickness tooth cavity of the plate forging forming device, thereby obtaining an unequal thickness tooth plate forging (53); the unequal thickness tooth plate forging (53) comprises a second cylinder bottom area (531), a second cylinder wall area (532) and a second flange area (533); the second cylinder bottom area (531) is parallel to the second flange area (533); the second cylinder bottom area (531) and the second flange area (533) are respectively connected to the two ends of the second cylinder wall area (532); the outer edge of the second flange area (533) is an annular unequal thickness tooth shape; the height of the second cylinder wall area (532) is less than the height of the first cylinder wall area (522); and there is a rounded transition between the second cylinder bottom area (531) and the second cylinder wall area (532); The unequal thickness tooth plate forging (53) is forged into a cylinder wall thickening plate forging (54); the cylinder wall thickening plate forging (54) includes a third cylinder bottom area (541), a third cylinder wall area (542) and a third flange area (543), the height of the third cylinder wall area (542) is less than the height of the second cylinder wall area (532); the third cylinder bottom area (541) is parallel to the third flange area (543); the third cylinder bottom area (541) and the third flange area (543) are respectively connected to the two ends of the third cylinder wall area (542); the outer edge of the third flange area (543) is an annular unequal thickness tooth shape; the third cylinder bottom area (541) and the third cylinder wall area (542) have a rounded transition; The cylinder wall thickening plate forging (54) is forged so that the material of the third cylinder wall region (542) is filled with the plurality of V-shaped tooth cavities and the annular protrusion cavity of the plate forging forming device to obtain a plate forging forming part (55); the plate forging forming part (55) The invention comprises a fourth cylinder bottom area (551), a fourth cylinder wall area (552) and a fourth flange area (553); the fourth cylinder bottom area (551) is parallel to the fourth flange area (553); the fourth cylinder bottom area (551) and the fourth flange area (553) are respectively connected to the two ends of the fourth cylinder wall area (552); the outer edge of the fourth flange area (553) is an annular tooth shape with uneven thickness; a rounded transition is formed between the fourth cylinder bottom area (551) and the fourth cylinder wall area (552); the height of the fourth cylinder wall area (552) is lower than the height of the third cylinder wall area (542); the outer wall of the fourth cylinder wall area (552) has a plurality of circles of V-shaped teeth, and the plurality of circles of V-shaped teeth are arranged at intervals along the axial direction of the plate forging part (55); the outer wall of the connection between the fourth cylinder wall area (552) and the fourth cylinder bottom area (551) is an annular protrusion shape.

2. The method according to claim 1, characterized in that The plate forging forming device comprises a flanged cylindrical part preforming die (1), and the flanged cylindrical part preforming die (1) comprises a drawing punch (11), a blank holder (12), a drawing die (13), a first upper cylinder (14) of a first press, and a second upper cylinder (15) of a first press; the drawing punch (11) is connected to the second upper cylinder (15) of the first press, and the blank holder (12) is connected to the first upper cylinder (14) of the first press; the drawing die (13) is a cylinder with a pit in the middle; the drawing punch (11) is a cylinder that allows it to move up and down in the pit of the drawing die (13), and the blank holder (12) is located at the outer edge of the top of the drawing die (13); The method of forging a circular plate blank (51) into a cylindrical member (52) with a flange comprises: A circular plate blank (51) with uniform thickness is placed centrally on the flange plane of the drawing die (13), and the first upper cylinder (14) of the first press is controlled to apply a blanking force to the blank holder (12) to press the outer edge of the circular plate blank (51) against the flange plane of the drawing die (13); The second upper cylinder (15) of the first press is controlled to push the drawing punch (11) downward to draw the circular plate blank (51) into the first cavity to obtain a flanged cylindrical part (52) with uniform wall thickness; the first cavity is surrounded by the drawing punch (11), the pressure ring (12) and the drawing die (13).

3. The method according to claim 2, characterized in that The drawing punch (11) and the drawing die (13) are coaxial; The controlling of the second upper cylinder (15) of the first press to push the drawing punch (11) downward comprises: The second upper cylinder (15) of the first press is controlled to push the drawing punch (11) downward until the thickness of the first gap (A) between the drawing punch (11) and the drawing die (13) reaches a target value; the target value is equal to a first multiple of the thickness of the circular plate blank (51); the second upper cylinder (15) of the first press is controlled to stop descending and maintain the pressure for a first preset time.

4. The method according to claim 1, wherein The plate forging forming device comprises a unequal thickness tooth profile final forming plate forging die (2), and the unequal thickness tooth profile final forming plate forging die (2) comprises a first upper punch (21), a first pressing plate (22), a first die (23), a first lower punch (24), a first upper cylinder (25) of a second press, a second upper cylinder (26) of a second press, and a lower cylinder (27) of a second press; the first upper punch (21) is connected to the second upper cylinder (26) of the second press, the first pressing plate (22) is connected to the first upper cylinder (25) of the second press, and the first lower punch (24) is connected to the lower cylinder (27) of the second press; The middle of the first die (23) is a pit, and the top is a step with a stepped transition; the bottom of the pit of the first die (23) is the first lower punch (24) that allows upward and downward movement, and the outer wall of the first lower punch (24) is in sliding fit with the inner wall of the first die (23); the first upper punch (21) is a cylinder that allows upward and downward movement in the pit of the first die (23), and the first pressing plate (22) is in clearance fit with the step of the first die (23); the outer edges of the first pressing plate (22), the first die (23) and the first flange area (523) form an annular tooth cavity with unequal thickness; The flanged cylindrical member (52) is forged so that the materials of the first cylinder wall region (522) and the first flange region (523) completely fill the annular unequal thickness tooth cavity of the plate forging forming device to obtain the unequal thickness tooth plate forging (53), comprising: Placing the flanged cylindrical member (52) in the cavity of the first die (23), and controlling the first upper cylinder (25) of the second press to push the first pressing plate (22) downward, so as to press the first flange area (523) against the stepped flange plane of the first die (23); Controlling the lower cylinder (27) of the second press to push the first lower punch (24), the first upper punch (21), and the first barrel bottom area (521) upward, and at the same time, controlling the second upper cylinder (26) of the second press to apply a load downward to the first upper punch (21) so that the first barrel bottom area (521) is clamped; When the first barrel bottom area (521) is clamped, the second press lower cylinder (27) is controlled to continue to move upward so that the materials of the first barrel wall area (522) and the first flange area (523) fill the annular unequal thickness tooth cavity to obtain an unequal thickness tooth plate forging (53).

5. The method according to claim 4, characterized in that The first pressing plate (22) includes a first pressing plate step surface (221), a first pressing plate outer tooth surface (222), a first pressing plate bottom surface (223), a first pressing plate fillet (224) and a first pressing plate inner surface (225); the first pressing plate step surface (221) is vertically connected to the first pressing plate outer tooth surface (222); the number and shape of the unequal thickness teeth on the first pressing plate outer tooth surface (222) are consistent with the number and shape of the unequal thickness teeth on the outer edge of the second flange area (533); the first pressing plate bottom surface (223) is vertically connected to the first pressing plate outer tooth surface (222); the first pressing plate inner surface (225) is vertical to the first pressing plate bottom surface (223); the transition between the first pressing plate bottom surface (223) and the first pressing plate inner surface (225) is the first pressing plate fillet (224); the first pressing plate fillet (224) is an outwardly convex fillet; The first die (23) comprises a first die top surface (231), a first die inner tooth surface (232), a first die step surface (233) and a first die inner surface (234); two ends of the first die step surface (233) are respectively connected to the first die top surface (231) and the first die inner tooth surface (232); the connection between the first die step surface (233) and the first die inner tooth surface (232) is a tooth-shaped plane with a pit; the first die inner surface (234) is a cylindrical surface, and the first die inner surface (234) and the first die step surface (233) are connected by a fillet transition; the first pressure plate outer tooth surface (222) and the first die inner tooth surface (232) are clearance-fitted; the inner diameter of the first die inner surface (234) is smaller than the inner diameter of the first die top surface (231); The first lower punch (24) includes a first lower punch fillet (241), a first lower punch step surface (242) and a first lower punch outer surface (243); the first lower punch fillet (241) is an upwardly protruding annular arc-shaped structure, and the shape of the first lower punch fillet (241) is consistent with the fillet shape of the outer side of the first barrel bottom area (521); the first lower punch step surface (242) is composed of two parallel planes, and there is an arc transition between the two parallel planes; the first lower punch outer surface (243) is a cylindrical surface, and the first lower punch outer surface (243) is perpendicular to the first lower punch step surface (242).

6. The method according to claim 1, characterized in that The plate forging forming device comprises a cylinder wall thickening preformed plate forging die (3), wherein the cylinder wall thickening preformed plate forging die (3) comprises a second upper punch (31), a second pressing plate (32), a second die (33), a second lower punch (34), a first upper cylinder (35) of a third press, a second upper cylinder (36) of the third press, and a lower cylinder (37) of the third press; the second upper punch (31) is connected to the second upper cylinder (36) of the third press, the second pressing plate (32) is connected to the first upper cylinder (35) of the third press, and the second lower punch (34) is connected to the lower cylinder (37) of the third press; the second die (33) The middle is a pit, and the top is a step with a stepped transition; the bottom of the pit of the second die (33) is the second lower punch (34) that allows up and down movement, and the outer wall of the second lower punch (34) is in sliding fit with the inner wall of the second die (33); the second upper punch (31) is a cylinder that allows up and down movement in the pit of the second die (33), and the second pressing plate (32) is in clearance fit with the step of the second die (33); the outer edges of the second pressing plate (32), the second die (33) and the second flange area (533) form an annular tooth cavity with unequal thickness; The method of forging the unequal thickness tooth plate forging (53) into a cylinder wall thickened plate forging (54) comprises: Placing the unequal thickness tooth plate forging (53) in the cavity of the second die (33), and controlling the first upper cylinder (35) of the third press machine to push the second pressing plate (32) downward to press the second flange area (533) against the stepped flange plane of the second die (33); The lower cylinder (37) of the third press is controlled to push the second lower punch (34), the second upper punch (31), and the second barrel bottom area (531) upward. At the same time, the second upper cylinder (36) of the third press is controlled to apply a load downward to the second upper punch (31) so that the second barrel bottom area (531) is clamped and the material of the second barrel wall area (532) fills the second cavity to obtain the barrel wall thickened plate forging (54); the second cavity is surrounded by the second die (33) and the unequal thickness tooth plate forging (53), and the thickness of the third barrel wall area (542) is greater than the thickness of the second barrel wall area (532).

7. The method according to claim 6, characterized in that The second upper punch (31), the second concave die (33), and the second lower punch (34) are all coaxial; The second pressure plate (32) includes a second pressure plate step surface (321), a second pressure plate outer tooth surface (322), a second pressure plate bottom surface (323), a second pressure plate fillet (324) and a second pressure plate inner surface (325); the second pressure plate step surface (321) is vertically connected to the second pressure plate outer tooth surface (322); the number and shape of the unequal thickness teeth on the second pressure plate outer tooth surface (322) are consistent with the number and shape of the unequal thickness teeth on the outer edge of the second flange area (533); the second pressure plate bottom surface (323) is vertically connected to the second pressure plate outer tooth surface (322); the second pressure plate inner surface (325) is vertical to the second pressure plate bottom surface (323); the transition between the second pressure plate bottom surface (323) and the second pressure plate inner surface (325) is the second pressure plate fillet (324); the second pressure plate fillet (324) is an outwardly convex fillet; The second die (33) includes a second die top surface (331), a second die inner tooth surface (332), a second die step surface (333), and a second die inner surface (334); the second die step surface (333) is perpendicular to the second die inner tooth surface (332), and the connection between the second die step surface (333) and the second die inner tooth surface (332) is a tooth-shaped plane with a pit; the second die inner surface (334) is a cylindrical surface, and the second die inner surface (334) and the second die step surface (333) are connected by a fillet transition; the second pressing plate outer tooth surface (322) and the second die inner tooth surface (332) are clearance-fitted; the inner diameter of the second die inner surface (334) is smaller than the inner diameter of the second die top surface (331); The second lower punch (34) includes a second lower punch fillet (341), a second lower punch step surface (342) and a second lower punch outer surface (343); the second lower punch fillet (341) is an upwardly protruding annular arc-shaped structure; the second lower punch outer surface (343) and the second die inner surface (334) are clearance-fitted; the second lower punch step surface (342) is composed of two parallel planes, and there is an arc transition between the two parallel planes; the second lower punch outer surface (343) is a cylindrical surface, and the second lower punch outer surface (343) is perpendicular to the second lower punch step surface (342); When the lower cylinder (37) of the third press pushes the second upper punch (31) upward, the distance between the second upper punch (31) and the second die (33) is equal to the second gap (C); the minimum value of the second gap (C) is greater than the first multiple of the thickness of the circular slab (51), and the maximum value of the second gap (C) is less than the second multiple of the thickness of the circular slab (51); the second multiple is greater than the first multiple.

8. The method according to claim 1, characterized in that The plate forging forming device comprises a cylindrical wall V-shaped tooth final forming plate forging die (4), and the cylindrical wall V-shaped tooth final forming plate forging die (4) comprises a third upper punch (41), a third pressing plate (42), a third die (43), a third lower punch (44), a first upper cylinder (45) of a fourth press, a second upper cylinder (46) of a fourth press, and a lower cylinder (47) of a fourth press; the third upper punch (41) is connected to the second upper cylinder (46) of the fourth press, the third pressing plate (42) is connected to the first upper cylinder (45) of the fourth press, and the third lower punch (44) is connected to the lower cylinder (47) of the fourth press; the third die (43) The middle is a pit, and the top is a step with a stepped transition; the bottom of the pit of the third die (43) is the third lower punch (44) that allows up and down movement, and the outer wall of the third lower punch (44) is slidably fitted with the inner wall of the third die (43); the third upper punch (41) is a cylinder that allows up and down movement in the pit of the third die (43), and the third pressure plate (42) is clearance-fitted with the step of the third die (43); the outer edges of the third pressure plate (42), the third die (43) and the third flange area (543) form an annular tooth cavity of unequal thickness; the inner wall of the third die (43) has a plurality of circles of V-shaped tooth cavities and annular convex cavities, and the plurality of circles of V-shaped tooth cavities are arranged at intervals along the axial direction of the inner wall of the third die (43); the annular convex cavity is arranged along the bottom of the inner wall of the third die (43); The forging of the cylinder wall thickening plate forging (54) is performed so that the material of the third cylinder wall region (542) is filled with the plurality of V-shaped tooth cavities and the annular protrusion cavity of the plate forging forming device, thereby obtaining a plate forging forming part (55), comprising: The barrel wall thickening plate forging (54) is placed in the cavity of the third die (43), and the first upper cylinder (45) of the fourth press is controlled to push the third pressing plate (42) downward to press the third flange area (543) against the stepped flange plane of the third die (43); The fourth press lower cylinder (47) is controlled to push the third lower punch (44), the third upper punch (41), and the third barrel bottom area (541) upward. At the same time, the fourth press second upper cylinder (46) is controlled to apply a load downward to the third upper punch (41) so that the third barrel bottom area (541) is clamped and the third barrel wall area (542) is filled with materials of several circles of V-shaped tooth cavities and annular protrusion cavities to obtain a plate forging formed part (55); the several circles of V-shaped tooth cavities and annular protrusion cavities are surrounded by the third die (43) and the third barrel wall area (542).

9. The method according to claim 8, characterized in that The third die (43) includes a third die top surface (431), a third die inner tooth surface (432), a third die step surface (433) and a third die inner surface (434); the third die inner surface (434) includes a third die V-shaped surface (4341) and a third die inner cylindrical surface (4342), and the third die V-shaped surface (4341) is consistent with the V-shaped tooth profile of the fourth barrel wall area (552); the third lower punch (44) includes a third lower punch step surface (441), a third lower punch fillet (442) and a third lower punch outer surface (443); the third lower punch outer surface (443) and the third die inner cylindrical surface (4342) are clearance fitting surfaces.

10. The method according to claim 8, characterized in that The third pressure plate (42) includes a third pressure plate step surface (421), a third pressure plate outer tooth surface (422), a third pressure plate bottom surface (423), a third pressure plate fillet (424) and a third pressure plate inner surface (425); the third pressure plate step surface (421) is vertically connected to the third pressure plate outer tooth surface (422); the number and shape of the unequal thickness teeth on the third pressure plate outer tooth surface (422) are consistent with the number and shape of the unequal thickness teeth on the outer edge of the second flange area (533); the third pressure plate bottom surface (423) is vertically connected to the third pressure plate outer tooth surface (422); the third pressure plate inner surface (425) is vertical to the third pressure plate bottom surface (423); the transition between the third pressure plate bottom surface (423) and the third pressure plate inner surface (425) is the third pressure plate fillet (424); the third pressure plate fillet (424) is an outwardly convex fillet; The third lower punch (44) includes a third lower punch step surface (441), a third lower punch fillet (442) and a third lower punch outer surface (443); the third lower punch fillet (442) is an upwardly protruding annular arc-shaped structure, and the shape of the third lower punch fillet (442) is consistent with the fillet shape of the outer side of the third barrel bottom area (541); the third lower punch step surface (441) is composed of two parallel planes, and there is an arc transition between the two parallel planes; the third lower punch outer surface (443) is a cylindrical surface, and the third lower punch outer surface (443) is perpendicular to the third lower punch step surface (441).

Images