Drum-shaped toothed special-shaped part forming process and mold

Abstract

The invention discloses a drum-shaped toothed special-shaped part forming process and a drum-shaped toothed special-shaped part forming die and belongs to the field of die stamping, and the drum-shaped toothed special-shaped part forming die comprises a cutting die, a sizing die, an evacuation die, a straight pipe punching die, a drum-shaped punching die, a drum face tooth-shaped punching die and a flange punching die. The shaping die is used for shaping the end face of a material blank to obtain a shaped blank, the hole drawing die is used for conducting extrusion hole drawing on the shaped blank to obtain a hole drawing blank, the straight pipe punching die is used for conducting through drilling in the axial direction of the hole drawing blank to obtain a straight pipe blank, and the drum-shaped punching die is used for conducting rod shrinkage on the straight pipe blank and conducting extrusion to form a drum shape to obtain a drum-shaped blank. The crowned surface tooth profile punching die is used for processing a crowned surface tooth profile on the crowned surface of the crowned blank to obtain a crowned surface tooth profile blank, and the flange punching die is used for punching flanges at the two ends of the crowned surface tooth profile blank to obtain a finished product. According to the embodiment of the invention, the multi-station cold forging technology is adopted, so that the drum-shaped toothed special-shaped part is formed at one time, the machining procedures are reduced, and the machining efficiency of products and the material utilization rate are improved.

Description

Technical Field

[0001] The invention relates to the technical field of die stamping, and in particular to a forming process and a die for a drum-shaped toothed special-shaped part. Background Art

[0002] Drums are a common component in automotive shock absorber systems and are in high demand. Traditionally, these toothed drums have been produced using cold forging, followed by CNC machining to remove excess material, and then gear hobbing. However, this method involves numerous production steps, resulting in low overall efficiency and high production costs. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a drum-shaped toothed special-shaped part forming process and mold, which can reduce processing steps, improve production efficiency and reduce production costs.

[0004] A forming die for a drum-shaped toothed special-shaped part according to an embodiment of the present invention comprises:

[0005] Cutting die, used to cut the material to obtain the blank;

[0006] A shaping die is used to shape the end surface of the blank to obtain a shaped blank;

[0007] A punching die is used to extrude and punch holes in the shaped blank to obtain a punched blank;

[0008] Punching straight tube die, used to punch through the axial direction of the punching billet to obtain a straight tube billet;

[0009] Punching drum-shaped die, used to shrink the straight tube billet and extrude the drum shape to obtain the drum-shaped billet;

[0010] A drum surface tooth-shaped die is used to process the drum surface tooth shape of the drum blank to obtain a drum surface tooth-shaped blank;

[0011] The flange punching die is used to punch flanges at both ends of the drum head tooth-shaped blank to obtain the finished product.

[0012] A drum-shaped toothed special-shaped part forming die according to an embodiment of the present invention has at least the following beneficial effects:

[0013] By adopting multi-station cold forging technology and controlling the forming steps of the blank through reasonable station tasks, the drum-shaped toothed special-shaped parts can be formed in one step. In addition, this processing technology uses a multi-station cold heading machine, which can perform continuous automatic processing, reducing the processing steps, improving the product's processing efficiency and material utilization, and significantly reducing the production cost of the entire product.

[0014] According to some embodiments of the present invention, the cutting die includes a shearing die, a cutting block, a stop rod, a feeding wheel and a pushing rod, the shearing die is provided with a first channel for feeding the material, the cutting block is slidably connected to one side of the shearing die, the cutting block is provided with a second channel for feeding the material, the stop rod is provided at one end of the cutting block away from the shearing die, the feeding wheel is used to drive the material to extend into the first channel and the second channel, the pushing rod is provided on one side of the shearing die, and is used to extend into the second channel to push out the blank in the second channel;

[0015] In which, the cutting die has a first state and a second state. When the cutting die is in the first state, the first channel corresponds to the second channel, and the blocking rod blocks the end of the second channel away from the shearing die; when the cutting die is in the second state, the first channel is staggered with the second channel, and the axial direction of the pushing rod corresponds to the second channel.

[0016] According to some embodiments of the present invention, the shaping die includes a first upper die and a first lower die, the first upper die is arranged above the first lower die, the first upper die is provided with a first upper punch, the first lower die is provided with a first lower main die and a first lower punch, the first lower main die is provided with a first cavity for placing a blank, the upper and lower ends of the first cavity are open, the first lower punch is used to extend into the first cavity to support the blank and push the blank out of the first cavity, the first upper punch is used to extend into the first cavity to cooperate with the first lower main die and the first lower punch to shape the end face of the blank.

[0017] According to some embodiments of the present invention, the hole-drawing die includes a second upper die and a second lower die, the second upper die is arranged above the second lower die, the second upper die is provided with a second upper punch, the second lower die is provided with a second lower main die, a second lower punch and a first lower push tube, a second cavity for placing the plastic blank is provided in the second lower main die, the upper and lower ends of the second cavity are open, the second lower punch is used to extend into the second cavity to support the plastic blank, a stamping protrusion is provided below the second upper punch, the second upper punch is used to extend into the second cavity to cooperate with the second lower main die and the second lower punch to extrude holes in the plastic blank, thereby obtaining the hole-drawing blank;

[0018] The first push-down tube is slidably sleeved on the second lower punch rod, and the first push-down tube is used to push the punching blank out from the second lower punch rod.

[0019] According to some embodiments of the present invention, the straight tube die includes a third upper die and a third lower die, the third upper die is arranged above the third lower die, the third upper die is provided with a third upper punch, the third lower die is provided with a third lower main die, a third lower punch and a second lower push tube, a third cavity for placing a punching blank is provided in the third lower main die, the upper and lower ends of the third cavity are open, the third lower punch is used to extend into the third cavity to support the punching blank, the third upper punch is provided with a through hole for the third lower punch to extend into, the third upper punch is used to extend into the third cavity to cooperate with the third lower main die and the third lower punch to axially open the punching blank, thereby obtaining the straight tube blank;

[0020] The second push-down tube is slidably sleeved on the third lower punch rod, and the second push-down tube is used to push the straight tube blank out of the third lower punch rod.

[0021] According to some embodiments of the present invention, the punch drum-shaped die includes a fourth upper die and a fourth lower die, the fourth upper die is arranged above the fourth lower die, the fourth upper die is provided with a first upper main die, a fourth upper punch and a first upper push tube, the first upper main die is provided with a fourth cavity for the upper end of the straight tube blank to extend therein, the upper and lower ends of the fourth cavity are open, the fourth cavity includes a first straight rod portion and a first drum-shaped portion connected in sequence, the first drum-shaped portion is located below the first straight rod portion, the fourth upper punch extends into the fourth cavity, the inner wall of the first drum-shaped portion is provided with an arc-shaped surface, and the inner diameter of the inner wall of the first drum-shaped portion gradually increases in a direction away from the first straight rod portion;

[0022] The fourth lower mold is provided with a fourth lower main mold, a fourth lower punch and a third lower push tube, a fifth cavity for placing the lower end of the straight tube blank is provided in the fourth lower main mold, the upper and lower ends of the fifth cavity are open, the fifth cavity includes a second straight rod portion and a second drum-shaped portion connected in sequence, the second drum-shaped portion is located above the second straight rod portion, the fourth lower punch extends into the fifth cavity, the inner wall of the second drum-shaped portion is provided with an arc-shaped surface, and the inner diameter of the inner wall of the second drum-shaped portion gradually increases in a direction away from the second straight rod portion;

[0023] The first upper push tube is slidably sleeved on the fourth upper punch rod, and the third lower push tube is slidably sleeved on the fourth lower punch rod. The first upper push tube is used to cooperate with the third lower push tube to extrude the straight tube blank to form a drum-shaped blank.

[0024] According to some embodiments of the present invention, the drum surface tooth-shaped die includes a fifth upper die and a fifth lower die, the fifth upper die is arranged above the fifth lower die, the fifth upper die is provided with a second upper main die, a fifth upper punch rod and a second upper push tube, the second upper main die is provided with a sixth cavity for the upper end of the drum-shaped blank to extend into, the upper and lower ends of the sixth cavity are open, the sixth cavity includes a third straight rod portion and a first tooth-shaped portion connected in sequence, the first tooth-shaped portion is located below the third straight rod portion, the fifth upper punch rod extends into the sixth cavity, a plurality of tooth-shaped protrusions for processing the drum surface of the drum-shaped blank into a drum surface tooth shape are provided on the inner wall of the first tooth-shaped portion, and the second upper push tube is slidably sleeved on the fifth upper punch rod;

[0025] The fifth lower mold is provided with a fifth lower main mold, a fifth lower punch and a fourth lower push tube. The fifth lower main mold is provided with a seventh cavity for placing the lower end of the drum-shaped blank. The upper and lower ends of the seventh cavity are open. The seventh cavity includes a fourth straight rod portion and a second tooth-shaped portion connected in sequence. The second tooth-shaped portion is located above the fourth straight rod portion. The fifth lower punch extends into the seventh cavity. A plurality of tooth-shaped protrusions for processing the drum surface of the drum-shaped blank into a drum surface tooth shape are provided on the inner wall of the second tooth-shaped portion. The fourth lower push tube is slidably sleeved on the fifth lower punch.

[0026] According to some embodiments of the present invention, the punching flange die includes a punching die assembly and a die assembly, the punching die assembly includes an outer push tube and an inner push tube, the outer push tube is slidably sleeved on the outside of the inner push tube, the die assembly includes a die shell, multiple sheet die cores, multiple die core springs, a straight push tube and a push rod, a die cavity is provided in the die shell, the die cavity includes an expansion part and a limiting part connected in sequence, the expansion part is located above the limiting part, the inner diameter of the expansion part is larger than the inner diameter of the limiting part, and multiple sheet die cores are arranged in the die cavity in a ring array. The core spring is connected between two adjacent sheet mold cores, and multiple sheet mold cores are slidably connected to the molding cavity. In the pre-stamping state, multiple sheet mold cores are located in the expansion part, and multiple core springs push multiple sheet mold cores away from each other to facilitate the placement of the drum surface tooth blank, and the push rod is passed through the drum surface tooth blank; in the stamping state, the external push tube pushes multiple sheet mold cores into the limiting part, and multiple sheet mold cores are close to each other to clamp the drum surface tooth blank, and the straight push tube cooperates with the internal push tube to punch flanges at both ends of the drum surface tooth blank.

[0027] A forming process for a drum-shaped toothed special-shaped part according to an embodiment of the present invention includes the following steps:

[0028] Cut the material into billets;

[0029] Shaping the end surface of the blank to obtain a shaped blank;

[0030] Extruding and punching holes in the shaped blank to obtain a punched blank;

[0031] Punch through the hollow billet along the axial direction to obtain a straight billet;

[0032] The straight tube billet is subjected to rod shrinkage, and after the rod shrinkage is completed, the intermediate material of the straight tube billet is squeezed outward to obtain a drum-shaped billet;

[0033] Applying pressure to the drum surface of the drum-shaped blank to obtain a drum surface tooth-shaped blank;

[0034] Pressure is applied to the two end rods of the drumhead tooth-shaped blank to form flanges at the two end rods to obtain a finished product.

[0035] A forming process for a drum-shaped toothed special-shaped part according to an embodiment of the present invention has at least the following beneficial effects:

[0036] By adopting multi-station cold forging technology and controlling the forming steps of the blank through reasonable station tasks, the drum-shaped toothed special-shaped parts can be formed in one step. In addition, this processing technology uses a multi-station cold heading machine, which can perform continuous automatic processing, reducing the processing steps, improving the product's processing efficiency and material utilization, and significantly reducing the production cost of the entire product.

[0037] According to some embodiments of the present invention, the material needs to undergo phosphating, wire drawing, spheroidizing annealing, phosphating, and fine drawing and sizing treatments in sequence before being processed into a blank.

[0038] Additional aspects and advantages of the present invention will be set forth in part in the description which follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0040] Figure 1 This is a process flow chart of a drum-shaped toothed special-shaped part forming process according to an embodiment of the present invention;

[0041] Figure 2 It is a structural schematic diagram of a drum-shaped toothed special-shaped part;

[0042] Figure 3 Schematic diagram of the structure of the cutting die of the drum-shaped toothed special-shaped part forming die according to an embodiment of the present invention;

[0043] Figure 4 Schematic diagram of the structure of the shaping die of the drum-shaped toothed special-shaped part forming die according to an embodiment of the present invention;

[0044] Figure 5 Schematic diagram of the structure of the punching die of the drum-shaped toothed special-shaped part forming die according to an embodiment of the present invention;

[0045] Figure 6Schematic diagram of the structure of the straight tube die of the drum-shaped toothed special-shaped part forming die according to an embodiment of the present invention;

[0046] Figure 7 Schematic diagram of the structure of the drum-shaped die of the drum-shaped toothed special-shaped part forming die according to an embodiment of the present invention;

[0047] Figure 8 Schematic diagram of the structure of the drum-shaped toothed special-shaped part forming die of the embodiment of the present invention;

[0048] Figure 9 This is a structural schematic diagram of the flange punching die of the drum-shaped toothed special-shaped part forming die according to an embodiment of the present invention when it is in a pre-punching state;

[0049] Figure 10 This is a structural schematic diagram of the flange punching die of the drum-shaped toothed special-shaped part forming die according to an embodiment of the present invention when it is in a punching state.

[0050] Figure Number:

[0051] 100, cutting die; 110, shearing die; 111, first channel; 120, cutting block; 121, second channel; 130, blocking rod; 140, feeding wheel; 150, pushing rod;

[0052] 200, shaping die; 210, first upper die; 211, first upper punch; 220, first lower die; 221, first lower main die; 2211, first cavity; 222, first lower punch;

[0053] 300, punching die; 310, second upper die; 311, second upper punch; 3111, punching protrusion; 320, second lower die; 321, second lower main die; 3211, second cavity; 322, second lower punch; 323, first lower push tube;

[0054] 400, straight tube punching die; 410, third upper die; 411, third upper punch; 4111, through hole; 420, third lower die; 421, third lower main die; 4211, third cavity; 422, third lower punch; 423, second lower push tube;

[0055] 500, punch drum mold; 510, fourth upper mold; 511, first upper main mold; 5111, fourth cavity; 5112, first straight rod; 5113, first drum-shaped portion; 512, fourth upper punch; 513, first upper push tube; 520, fourth lower mold; 521, fourth lower main mold; 5211, fifth cavity; 5212, second drum-shaped portion; 5213, second straight rod; 522, fourth lower punch; 523, third lower push tube;

[0056] 600, drum surface tooth-shaped mold; 610, fifth upper mold; 611, first upper main mold; 6111, sixth cavity; 6112, third straight rod; 6113, first tooth-shaped portion; 612, fifth upper punch; 613, second upper push tube; 620, fifth lower mold; 621, fifth lower main mold; 6211, seventh cavity; 6212, second tooth-shaped portion; 6213, fourth straight rod; 622, fifth lower punch; 623, fourth lower push tube;

[0057] 700, flange punching die; 710, die assembly; 711, external push tube; 7111, punch spring; 7112, punch spring pad; 712, internal push tube; 713, punch shell; 714, punch back pad; 715, punch long pad; 720, die assembly; 721, die shell; 7211, die cavity; 7212, expansion unit; 7213, limiter; 722, sheet die core; 7221, core spring; 723, straight push tube; 7231, push pad; 7232, hole seat; 7233, ejector pin; 724, ejector pin; 725, locking cap; 726, core back pad; 7261, back pad spring; 7262, spring ring pad; 7263, spring back pad; 727, die back pad;

[0058] a. Blank; b. Shaping blank; c. Hole-punched blank; d. Straight tube blank; e. Drum-shaped blank; f. Drum-surface tooth-shaped blank; g. Finished product. DETAILED DESCRIPTION

[0059] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0060] In the description of the present invention, 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", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0061] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0062] See also Figure 1 and Figure 2 According to an embodiment of the present invention, a drum-shaped toothed special-shaped part forming mold includes a cutting die 100, a shaping die 200, a vacuuming die, a straight tube die 400, a drum-shaped die 500, a drum-surface tooth-shaped die 600 and a flange die 700. The cutting die 100 is used to cut the material to obtain a blank a, the shaping die 200 is used to shape the end face of the blank a to obtain a shaped blank b, the punching die 300 is used to extrude and punch holes in the shaped blank b to obtain a punching blank c, the straight tube die 400 is used to punch through the punching blank c along the axial direction to obtain a straight tube blank d, the drum-shaped die 500 is used to shrink the straight tube blank d and extrude a drum shape to obtain a drum-shaped blank e, the drum-surface tooth-shaped die 600 is used to process the drum surface of the drum-shaped blank e into a drum-surface tooth shape to obtain a drum-surface tooth-shaped blank f, and the flange die 700 is used to punch flanges at both ends of the drum-surface tooth-shaped blank f to obtain a finished product g.

[0063] By adopting multi-station cold forging technology and controlling the forming steps of the blank through reasonable station tasks, the drum-shaped toothed special-shaped parts can be formed in one step. In addition, this processing technology uses a multi-station cold heading machine, which can perform continuous automatic processing, reducing the processing steps, improving the product's processing efficiency and material utilization, and significantly reducing the production cost of the entire product.

[0064] In some embodiments, see Figure 1 and Figure 3 The cutting die 100 includes a cutting die 110, a cutting block 120, a stop rod 130, a feeding wheel 140 and a pushing rod 150. A first channel 111 is provided in the cutting die 110, and the first channel 111 is used for feeding the material. The cutting block 120 is slidably connected to one side of the cutting die 110, and a second channel 121 is provided on the cutting block 120, and the second channel 121 is used for feeding the material. The stop rod 130 is provided at the end of the cutting block 120 away from the cutting die 110, and the feeding wheel 140 is used to drive the material to extend into the first channel 111 and the second channel 121. The pushing rod 150 is provided on one side of the cutting die 110, and the pushing rod 150 is used to extend into the second channel 121 to push out the blank a in the second channel 121.

[0065] Among them, the cutting die 100 has a first state and a second state. When the cutting die 100 is in the first state, the first channel 111 corresponds to the second channel 121, and the blocking rod 130 blocks the end of the second channel 121 away from the shearing die 110; when the cutting die 100 is in the second state, the first channel 111 is staggered with the second channel 121, and the axial direction of the pushing rod 150 corresponds to the second channel 121.

[0066] The initial state is the first state. The coiled material (material) is straightened by the straightening wheel on the cold heading machine, and then transmitted by the feeding wheel 140 to enter the first channel 111 and the second channel 121. The blocking rod 130 blocks the other end of the material; the driving mechanism on the cold heading machine drives the cutting block 120 to move, and the first channel 111 and the second channel 121 are staggered. The cutting block 120 cooperates with the shearing die 110 to cut the coiled material wire into blanks a of appropriate length; the cutting block 120 moves to the position corresponding to the second channel 121 and the pushing rod 150, and the cutting die 100 is in the second state. The pushing rod 150 moves upward and extends into the second channel 121 to push out the blank a, which is convenient for the robot to clamp.

[0067] In some embodiments, see Figure 1 and Figure 4 The shaping die 200 includes a first upper die 210 and a first lower die 220. The first upper die 210 is disposed above the first lower die 220. A first upper punch 211 is disposed on the first upper die 210. The first upper die 210 can move up and down relative to the first lower die 220. The first lower die 220 is provided with a first lower main die 221 and a first lower punch 222. A first cavity 2211 is disposed within the first lower main die 221. The first cavity 2211 is used to place the blank a. The upper and lower ends of the first cavity 2211 are open. The first lower punch 222 extends into the first cavity 2211 from below. The first lower punch 222 is used to support the blank a and push the blank a out of the first cavity 2211. The first upper punch 211 is used to extend into the first cavity 2211 and cooperate with the first lower main die 221 and the first lower punch 222 to shape the end surface of the blank a.

[0068] Blank a is transferred by a robotic arm to the workstation of the shaping die 200. Blank a enters the first die cavity 2211, supported by the first lower punch 222. The first upper die 210 lowers the first upper punch 211, which, in conjunction with the first lower main die 221 and the first lower punch 222, flattens the end surface of blank a and simultaneously chamfers the lower end surface, forming the shaping blank b. The first upper punch 211 and the first lower punch 222 also create positioning holes in the two end surfaces of blank a, facilitating subsequent hole extraction operations.

[0069] In some embodiments, see Figure 1 and Figure 5The punching die 300 includes a second upper die 310 and a second lower die 320. The second upper die 310 is positioned above the second lower die 320. A second upper punch 311 is provided on the second upper die 310, allowing the second upper die 310 to move up and down relative to the second lower die 320. The second lower die 320 is provided with a second lower main die 321, a second lower punch 322, and a first lower push tube 323. A second cavity 3211 is provided within the second lower main die 321. The second cavity 3211 is used to accommodate the shaped blank b. The upper and lower ends of the second cavity 3211 are open. The second lower punch 322 extends into the second cavity 3211 and supports the shaped blank b. A punching protrusion 3111 is provided below the second upper punch 311. The second upper punch 311 is used to extend into the second die cavity 3211 and cooperate with the second lower main die 321 and the second lower punch 322 to squeeze and punch a hole in the shaped blank b, thereby obtaining a punched blank c. A first lower push tube 323 is slidably mounted on the second lower punch 322 and is used to push the punched blank c from the second lower punch 322.

[0070] The shaped blank b is transferred by the robot to the punching die 300 station. It enters the second die cavity 3211 and is supported by the second lower punch 322. The second upper die 310 lowers the second upper punch 311, which then penetrates the second die cavity 3211 and cooperates with the second lower main die 321 and the second lower punch 322 to squeeze a hole into the shaped blank b, thereby producing a punched blank c. The second main die raises the second upper punch 311, and the first lower push tube 323 moves upward, pushing the punched blank c from the second lower punch 322.

[0071] In some embodiments, see 1 and Figure 6 The straight tube die 400 includes a third upper die 410 and a third lower die 420. The third upper die 410 is arranged above the third lower die 420. The third upper die 410 is provided with a third upper punch 411. The third upper die 410 can move up and down relative to the third lower die 420. The third lower die 420 is provided with a third lower main die 421, a third lower punch 422 and a second lower push tube 423. The third lower main die 421 is provided with a third cavity 4211. The third cavity 4211 is used to place the punching blank c. The upper and lower ends of the third cavity 4211 are open. The third lower punch 422 extends into the third die cavity 4211 and is used to support the punched tube blank c. The third upper punch 411 is provided with a through hole 4111 for the third lower punch 422 to extend into. The third upper punch 411 is used to extend into the third die cavity 4211 and cooperate with the third lower main die 421 and the third lower punch 422 to axially open the punched tube blank c, thereby obtaining a straight tube blank d. The second lower push tube 423 is slidably mounted on the third lower punch 422 and is used to push the straight tube blank d from the third lower punch 422.

[0072] The punched blank c is transferred by the robot to the straight tube die 400 station. The punched blank c enters the third cavity 4211, and the third lower punch 422 extends into the inner hole of the punched blank c to support it. The third upper die 410 drives the third upper punch 411 downward, and the third lower punch 422 abuts the upper end of the punched blank c. The third lower punch 422 is pushed upward by the lower push rod. The third lower punch 422 squeezes the excess waste in the inner hole of the punched blank c into the through hole 4111 of the third upper punch 411, thereby obtaining a straight tube blank d. The other end of the through hole 4111 of the third upper punch 411 can be connected to an external suction device to extract the waste. The third main die drives the third upper punch 411 upward, and the second lower push tube 423 moves upward, pushing the straight tube blank d from the third lower punch 422.

[0073] In some embodiments, see Figure 1 and Figure 7 The drum-shaped die 500 includes a fourth upper die 510 and a fourth lower die 520. The fourth upper die 510 is disposed above the fourth lower die 520 and can move up and down relative to the fourth lower die 520. The fourth upper die 510 is provided with a first upper main die 611511, a fourth upper punch 512, and a first upper push tube 513. The first upper main die 611511 is provided with a fourth cavity 5111 for inserting the upper end of the straight tube blank d. The upper and lower ends of the fourth cavity 5111 are open, and the fourth upper punch 512 extends into the fourth cavity 5111. The fourth cavity 5111 includes a first straight rod portion 5112 and a first drum-shaped portion 5113 connected in sequence. The first drum-shaped portion 5113 is located below the first straight rod portion 5112. The inner wall of the first drum-shaped portion 5113 is arranged in an arc-shaped surface, and the inner diameter of the inner wall of the first drum-shaped portion 5113 gradually increases in the direction away from the first straight rod portion 5112.

[0074] The fourth lower mold 520 is provided with a fourth lower main mold 521, a fourth lower punch 522, and a third lower push tube 523. A fifth cavity 5211 is provided within the fourth lower main mold 521. The fifth cavity 5211 is used to accommodate the lower end of the straight tube blank d. The upper and lower ends of the fifth cavity 5211 are open, and the fourth lower punch 522 extends into the fifth cavity 5211. The fifth cavity 5211 includes a second straight rod portion 5213 and a second drum-shaped portion 5212 connected in sequence. The second drum-shaped portion 5212 is located above the second straight rod portion 5213. The inner wall of the second drum-shaped portion 5212 is provided with an arcuate surface, and the inner diameter of the inner wall of the second drum-shaped portion 5212 gradually increases in a direction away from the second straight rod portion 5213. The first upper push tube 513 is slidably mounted on the fourth upper punch 512 , and the third lower push tube 523 is slidably mounted on the fourth lower punch 522 . The first upper push tube 513 is used to cooperate with the third lower push tube 523 to extrude the straight tube blank d to form a drum-shaped blank e.

[0075] The straight tube blank d is transferred by the robot to the drum die 500 station. The lower end of the straight tube blank d is placed in the fifth die cavity 5211. The fourth lower punch 522 extends into the inner hole of the straight tube blank d, and the third lower push tube 523 abuts the lower end of the straight tube blank d. The fourth upper die 510 drives the fourth upper punch 512 and the first upper push tube 513 downward. The upper end of the straight tube blank d extends into the fourth die cavity 5111. The fourth lower punch 522 extends into the inner hole of the straight tube blank d, and the first upper push tube 513 abuts the upper end of the straight tube blank d. The first upper push tube 513 continues to move downward under the action of the pushing member, and the third lower push tube 523 continues to move upward under the action of the pushing member. The first upper push tube 513 and the third lower push tube 523 apply pressure to both ends of the straight tube blank d to perform open-type shrinkage. After the shrinkage is completed, the middle material of the straight tube blank d continues to be squeezed to flow outward, filling the first drum-shaped part 5113 and the second drum-shaped part 5212 to obtain the drum-shaped blank e.

[0076] In some embodiments, see Figure 1 and Figure 8 The drum surface tooth-shaped die 600 includes a fifth upper die 610 and a fifth lower die 620. The fifth upper die 610 is disposed above the fifth lower die 620 and can move up and down relative to the fifth lower die 620. The fifth upper die 610 is provided with a second upper main die, a fifth upper punch 612, and a second upper push tube 613. The second upper main die is provided with a sixth cavity 6111 for receiving the upper end of the drum-shaped blank e. The sixth cavity 6111 is open at its upper and lower ends, and the fifth upper punch 612 extends into the sixth cavity 6111. The sixth cavity 6111 includes a third straight rod portion 6112 and a first tooth-shaped portion 6113 connected in sequence. The first tooth-shaped portion 6113 is located below the third straight rod portion 6112. A plurality of tooth-shaped protrusions are provided on the inner wall of the first tooth-shaped portion 6113. The tooth-shaped protrusions are used to process the drum surface of the drum-shaped blank e into a drum surface tooth shape. The second upper push tube 613 is slidably mounted on the fifth upper punch rod 612.

[0077] The fifth lower mold 620 is provided with a fifth lower main mold 621, a fifth lower punch 622 and a fourth lower push tube 623. The fifth lower main mold 621 is provided with a seventh cavity 6211. The seventh cavity 6211 is used to place the lower end of the drum-shaped blank e. The upper and lower ends of the seventh cavity 6211 are open. The fifth lower punch 622 extends into the seventh cavity 6211. The seventh cavity 6211 includes a fourth straight rod portion 6213 and a second tooth-shaped portion 6212 connected in sequence. The second tooth-shaped portion 6212 is located above the fourth straight rod portion 6213. The inner wall of the second tooth-shaped portion 6212 is provided with a plurality of tooth-shaped protrusions. The tooth-shaped protrusions are used to process the drum surface of the drum-shaped blank e into a drum surface tooth shape. The fourth lower push tube 623 is slidably sleeved on the fifth lower punch 622.

[0078] The drum blank e is transferred by a robot to the drum surface tooth-shaped mold 600. The lower end of the drum blank e is placed in the seventh mold cavity 6211, and the fifth lower punch 622 extends into the inner hole of the drum blank e. The fifth upper mold 610 drives the fifth upper punch 612 and the second upper push tube 613 to descend, and the upper end of the drum blank e extends into the sixth mold cavity 6111, and the fifth lower punch 622 extends into the inner hole of the drum blank e. The second upper main mold and the fifth lower main mold 621 each have 45 evenly distributed raised teeth (tooth-like protrusions). Under the pressure of the second upper main mold and the fifth lower main mold 621, the raised teeth on the second upper main mold and the fifth lower main mold 621 will apply pressure to the drum surface of the drum blank e, causing the drum surface material to undergo plastic deformation, thereby filling the first tooth-shaped portion 6113 and the second tooth-shaped portion 6212 of the mold to obtain the drum surface tooth-shaped blank f.

[0079] In some embodiments, see Figure 1 、 Figure 9 and Figure 10 The flange die 700 includes a die assembly 710 and a punching die assembly 720. The die assembly 710 is located above the punching die assembly 720 and can move up and down relative to the punching die assembly 720. The die assembly 710 includes an external push tube 711, a punch spring 7111, a punch spring pad 7112, an internal push tube 712, a punch shell 713, a punch back pad 714, and a punch long pad 715. The external push tube 711 is slidably sleeved on the outside of the internal push tube 712, and one end of the external push tube 711 slides through the punch shell 713. The punch back pad 714 is located at the end of the punch shell 713 away from the die assembly 720. The punch long pad 715 is located at the end of the punch back pad 714 away from the die assembly 720. The punch spring 7111 is disposed within the punch housing 713. One end of the punch spring 7111 abuts against the external push tube 711, and the other end abuts against the punch back pad 714. The punch spring 7111 in the die assembly 710 is placed within the punch spring pad 7112. The punch spring 7111 exerts an axial preload on the external push tube 711, causing the external push tube 711 to cling to the inner step of the punch housing 713.

[0080] The die assembly 720 includes a die shell 721, multiple die cores 722, multiple die core springs 7221, a straight push tube 723, and a push rod 724. A die cavity 7211 is provided within the die shell 721. The die cavity 7211 includes an expansion portion 7212 and a stop portion 7213, which are connected in sequence. The expansion portion 7212 is located above the stop portion 7213, and the inner diameter of the expansion portion 7212 is larger than the inner diameter of the stop portion 7213. Multiple die cores 722 are arranged in an annular array within the die cavity 7211. A die core spring 7221 is connected between adjacent die cores 722. Each die core 722 is provided with a blind hole on both sides, and a die core spring 7221 is placed in the blind hole. Multiple sheet mold cores 722 are slidably connected to the die cavity 7211. In the pre-punching state, the multiple sheet mold cores 722 are located in the expansion portion 7212. Multiple mold core springs 7221 push the multiple sheet mold cores 722 away from each other to facilitate the placement of the drumhead tooth blank f. The push rod 724 is inserted into the drumhead tooth blank f. A locking cap 725 is connected to one end of the die shell 721, and a die backing pad 727 is provided at the other end.

[0081] In the initial state, the core spring 7221 will stretch the multiple sheet mold cores 722 due to its own elasticity. Due to the mold cavity restrictions of the locking cap 725 and the punching mold shell 721, the multiple sheet mold cores 722 can be stably open in the punching mold cavity 7211. The radial dimensions of the mold cavity rods of the multiple sheet mold cores 722 in the open state are greater than the maximum radial dimensions of the drumhead tooth blank f and the finished product g, so as to prevent the drumhead tooth blank f from interfering with the mold cavity of the multiple sheet mold cores 722 when entering the mold and demolding the finished product g. In addition, the rear pad spring 7261 is placed in the spring ring washer 7262, and the lower end of the rear pad spring 7261 abuts the spring rear pad 7263. The rear pad spring 7261 exerts an axial pre-tightening force on the core rear pad 726, so that the core rear pad 726 is tightly against the inner hole step of the punching mold shell 721.

[0082] In the stamping state, the external push tube 711 pushes multiple sheet mold cores 722 into the limiting part 7213, and the multiple sheet mold cores 722 approach each other to clamp the drum surface tooth blank f. The straight push tube 723 cooperates with the internal push tube 712 to punch out flanges at both ends of the drum surface tooth blank f.

[0083] The drumhead tooth blank f is transferred to the flange die punching station 700 by the robot, and the power equipment applies power and acts on the long pad 715 of the punch, thereby pushing the die assembly 710 forward. During the forward movement of the die assembly 710, the drumhead tooth blank f is first pushed into the push rod 724 by the inner push tube 712, so that the push rod 724 cooperates with the inner hole of the drumhead tooth blank f, ensuring the inner hole size of the drumhead tooth blank f while preventing the drumhead tooth blank f from falling down.

[0084] The die continues to move forward, and the outward pushing tube 711 contacts the multiple sheet mold cores 722 in the open state, thereby pushing the multiple sheet mold cores 722 in the open state to slide downward along the molding cavity 7211 of the molding shell 721. After sliding for a distance, the outer inclined surface of the steps of the multiple sheet mold cores 722 in the open state contacts the inner inclined surface of the molding cavity 7211 of the molding shell 721.

[0085] At this time, the punching die assembly 710 moves forward again (from the expansion part 7212 to the limiting part 7213), which will cause the punching die shell 721 to exert radial force on the multiple sheet mold cores 722 along the inner inclined surface, thereby causing the multiple sheet mold cores 722 to compress the core spring 7221. Therefore, at this time, the multiple sheet mold cores 722 are pushed by the external push tube 711, and at the same time begin to shrink inward during the backward movement.

[0086] The die assembly 710 moves forward, and the upper inclined surfaces of the outer surfaces of the multiple sheet mold cores 722 are separated from the upper inclined surfaces of the molding cavity 7211 of the molding shell 721. The multiple sheet mold cores 722 perform a new round of fitting movement with the molding cavity 7211 of the molding shell 721 in the axial direction. At this time, the multiple sheet mold cores 722 complete the clamping state. Because the drum head tooth blank f is pushed by the inner push tube 712, it moves backward synchronously with the multiple sheet mold cores 722. Therefore, the multiple sheet mold cores 722 in the clamping state just wrap the drum head tooth blank f.

[0087] The die assembly 710 moves forward, and under the push of the inner push tube 712 and the outer push tube 711, the multiple sheet mold cores 722 in the clamped state wrap the drum head tooth blank f and continue to sink along the molding cavity 7211 of the molding shell 721. After sinking a short distance, the multiple sheet mold cores 722 in the clamped state contact the mold core rear pad 726 in the pre-tightened state. At this time, the lower end face of the rod of the drum head tooth blank f also happens to contact the straight push tube 723.

[0088] The die assembly 710 moves forward, and the drum-shaped tooth-shaped blank f, which is wrapped by the multiple sheet mold cores 722 in a tightly held state, undergoes plastic deformation at the exposed rod areas at both ends of the blank under the action of the inner push tube 712 and the straight push tube 723, thereby filling the mold and forming the flange. However, the portion of the blank wrapped by the multiple sheet mold cores 722 will not undergo significant deformation due to the limitation of the mold, and the rod size of the product can be effectively guaranteed. At this point, the finished product g is obtained;

[0089] After the finished product g is formed, the die assembly 710 retreats, and after the inner push tube 712 and the outer push tube 711 are separated from the finished product g and the multiple sheet mold cores 722, the rear-pass device of the cold heading forming machine will push the ejector pin 7233 to pass forward along the hole seat 7232, and the ejector pin 7233 pushes the ejection pad 7231 and the straight push tube 723, and then the straight push tube 723 pushes the finished product g and the multiple sheet mold cores 722 in the clamping state to move forward along the die cavity 7211 of the die shell 721. During the process, after the multiple sheet mold cores 722 in the clamped state are separated from the axial contact surface of the molding cavity 7211 of the molding shell 721, the multiple sheet mold cores 722 are stretched open by the elastic action of the mold core spring 7221, and the stretched multiple sheet mold cores 722 will be blocked by the locking cap 725 at the inner hole step of the locking cap 725 during the forward movement, and the straight push tube 723 continues to push the finished product g through the multiple sheet mold cores 722 in the open state and fall off the push rod 724.

[0090] See Figure 1 and Figure 2 According to an embodiment of the present invention, a drum-shaped toothed special-shaped part forming process includes the following steps:

[0091] The material is cut into billets a.

[0092] The end surface of the blank a is shaped to obtain a shaped blank b.

[0093] The shaped blank b is extruded and punched to obtain a punched blank c.

[0094] Punch through the punched billet c along the axial direction to obtain a straight tube billet d.

[0095] The straight tube blank d is subjected to rod shrinkage, and after the rod shrinkage is completed, the intermediate material of the straight tube blank d is squeezed to flow outward to obtain a drum-shaped blank e.

[0096] Applying pressure to the drum surface of the drum-shaped blank e yields a drum surface tooth-shaped blank f.

[0097] Pressure is applied to the two end rods of the drumhead tooth blank f to form flanges at both end rods to obtain the finished product g.

[0098] By adopting multi-station cold forging technology and controlling the forming steps of the blank through reasonable station tasks, the drum-shaped toothed special-shaped parts can be formed in one step. In addition, this processing technology uses a multi-station cold heading machine, which can perform continuous automatic processing, reducing the processing steps, improving the product's processing efficiency and material utilization, and significantly reducing the production cost of the entire product.

[0099] In some embodiments, see Figure 1 and Figure 2Before the material is processed into billet a, it needs to undergo phosphating, wire drawing, spheroidizing annealing, phosphating, and fine drawing and sizing treatments in sequence. The first phosphating treatment can attach a phosphating film to the material. The phosphating film acts as a protective layer to prevent oxidation and corrosion on the metal surface and extend the service life of the material. During the wire drawing process, the metal undergoes plastic deformation, and the grains are elongated and refined, thereby increasing the strength and hardness of the material. Spheroidizing annealing spheroidizes the carbides in the material, reduces the hardness, and increases the plasticity and toughness of the material. Phosphating again can further enhance the corrosion resistance of the material, especially on fresh metal surfaces that may be exposed after spheroidizing annealing. Fine drawing and sizing can accurately control the diameter and dimensional tolerance of the material to meet high precision requirements.

[0100] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0101] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A drum-shaped toothed special-shaped part forming die, characterized in that: include: Cutting die, used to cut the material to obtain the blank; A shaping die is used to shape the end surface of the blank to obtain a shaped blank; A punching die is used to extrude and punch holes in the shaped blank to obtain a punched blank; Punching straight tube die, used to punch through the axial direction of the punching billet to obtain a straight tube billet; Punching drum-shaped die, used to shrink the straight tube billet and extrude the drum shape to obtain the drum-shaped billet; A drum surface tooth-shaped die is used to process the drum surface tooth shape of the drum blank to obtain a drum surface tooth-shaped blank; The flange punching die is used to punch flanges at both ends of the drum head tooth-shaped blank to obtain the finished product.

2. A drum-shaped toothed special-shaped part forming die according to claim 1, characterized in that: The cutting die includes a shearing die, a cutting block, a stop rod, a feeding wheel and a pushing rod. A first channel for feeding material is provided in the shearing die, the cutting block is slidably connected to one side of the shearing die, a second channel for feeding material is provided on the cutting block, the stop rod is provided at one end of the cutting block away from the shearing die, the feeding wheel is used to drive the material to extend into the first channel and the second channel, and the pushing rod is provided on one side of the shearing die, and is used to extend into the second channel to push out the blank in the second channel; In which, the cutting die has a first state and a second state. When the cutting die is in the first state, the first channel corresponds to the second channel, and the blocking rod blocks the end of the second channel away from the shearing die; when the cutting die is in the second state, the first channel is staggered with the second channel, and the axial direction of the pushing rod corresponds to the second channel.

3. The drum-shaped toothed special-shaped part forming die according to claim 1, characterized in that: The shaping die includes a first upper die and a first lower die, the first upper die is arranged above the first lower die, the first upper die is provided with a first upper punch, the first lower die is provided with a first lower main die and a first lower punch, the first lower main die is provided with a first cavity for placing a blank, the upper and lower ends of the first cavity are open, the first lower punch is used to extend into the first cavity to support the blank and push the blank out of the first cavity, the first upper punch is used to extend into the first cavity to cooperate with the first lower main die and the first lower punch to shape the end face of the blank.

4. The drum-shaped toothed special-shaped part forming die according to claim 1, characterized in that: The hole-drawing die includes a second upper die and a second lower die, the second upper die is arranged above the second lower die, a second upper punch is provided on the second upper die, a second lower main die, a second lower punch and a first lower push tube are provided on the second lower main die, a second cavity for placing the plastic blank is provided in the second lower main die, the upper and lower ends of the second cavity are open, the second lower punch is used to extend into the second cavity to support the plastic blank, a stamping protrusion is provided below the second upper punch, the second upper punch is used to extend into the second cavity to cooperate with the second lower main die and the second lower punch to extrude a hole to the plastic blank, thereby obtaining the hole-drawing blank; The first push-down tube is slidably sleeved on the second lower punch rod, and the first push-down tube is used to push the punching blank out from the second lower punch rod.

5. The drum-shaped toothed special-shaped part forming die according to claim 1, characterized in that: The straight tube die comprises a third upper die and a third lower die, the third upper die is arranged above the third lower die, a third upper punch is provided on the third upper die, a third lower main die, a third lower punch and a second lower push tube are provided on the third lower main die, a third cavity for placing a hole-drawing blank is provided in the third lower main die, the upper and lower ends of the third cavity are open, the third lower punch is used to extend into the third cavity to support the hole-drawing blank, a through hole is provided on the third upper punch for the third lower punch to extend into, and the third upper punch is used to extend into the third cavity to cooperate with the third lower main die and the third lower punch to axially open the hole-drawing blank, thereby obtaining the straight tube blank; The second push-down tube is slidably sleeved on the third lower punch rod, and the second push-down tube is used to push the straight tube blank out of the third lower punch rod.

6. The drum-shaped toothed special-shaped part forming die according to claim 1, characterized in that: The punch drum-shaped die includes a fourth upper die and a fourth lower die, the fourth upper die is arranged above the fourth lower die, the fourth upper die is provided with a first upper main die, a fourth upper punch and a first upper push tube, the first upper main die is provided with a fourth cavity for the upper end of the straight tube blank to extend therein, the upper and lower ends of the fourth cavity are open, the fourth cavity includes a first straight rod portion and a first drum-shaped portion connected in sequence, the first drum-shaped portion is located below the first straight rod portion, the fourth upper punch extends into the fourth cavity, the inner wall of the first drum-shaped portion is provided with an arc-shaped surface, and the inner diameter of the inner wall of the first drum-shaped portion gradually increases in a direction away from the first straight rod portion; The fourth lower mold is provided with a fourth lower main mold, a fourth lower punch and a third lower push tube, a fifth cavity for placing the lower end of the straight tube blank is provided in the fourth lower main mold, the upper and lower ends of the fifth cavity are open, the fifth cavity includes a second straight rod portion and a second drum-shaped portion connected in sequence, the second drum-shaped portion is located above the second straight rod portion, the fourth lower punch extends into the fifth cavity, the inner wall of the second drum-shaped portion is provided with an arc-shaped surface, and the inner diameter of the inner wall of the second drum-shaped portion gradually increases in a direction away from the second straight rod portion; The first upper push tube is slidably sleeved on the fourth upper punch rod, and the third lower push tube is slidably sleeved on the fourth lower punch rod. The first upper push tube is used to cooperate with the third lower push tube to extrude the straight tube blank to form a drum-shaped blank.

7. The drum-shaped toothed special-shaped part forming die according to claim 1, characterized in that: The tooth-shaped die for punching the drum surface comprises a fifth upper die and a fifth lower die, the fifth upper die is arranged above the fifth lower die, the fifth upper die is provided with a second upper main die, a fifth upper punch rod and a second upper push tube, the second upper main die is provided with a sixth cavity for the upper end of the drum-shaped blank to extend into, the upper and lower ends of the sixth cavity are open, the sixth cavity comprises a third straight rod portion and a first tooth-shaped portion connected in sequence, the first tooth-shaped portion is located below the third straight rod portion, the fifth upper punch rod extends into the sixth cavity, a plurality of tooth-shaped protrusions for processing the drum surface of the drum-shaped blank into a drum surface tooth shape are provided on the inner wall of the first tooth-shaped portion, and the second upper push tube is slidably sleeved on the fifth upper punch rod; The fifth lower mold is provided with a fifth lower main mold, a fifth lower punch and a fourth lower push tube. The fifth lower main mold is provided with a seventh cavity for placing the lower end of the drum-shaped blank. The upper and lower ends of the seventh cavity are open. The seventh cavity includes a fourth straight rod portion and a second tooth-shaped portion connected in sequence. The second tooth-shaped portion is located above the fourth straight rod portion. The fifth lower punch extends into the seventh cavity. A plurality of tooth-shaped protrusions for processing the drum surface of the drum-shaped blank into a drum surface tooth shape are provided on the inner wall of the second tooth-shaped portion. The fourth lower push tube is slidably sleeved on the fifth lower punch.

8. The drum-shaped toothed special-shaped part forming die according to claim 1, characterized in that: The punching flange die includes a punching die assembly and a die assembly, the punching die assembly includes an outer push tube and an inner push tube, the outer push tube is slidably sleeved on the outside of the inner push tube, the die assembly includes a die shell, multiple sheet die cores, multiple die core springs, a straight push tube and a push rod, a die cavity is provided in the die shell, the die cavity includes an expansion part and a limiting part connected in sequence, the expansion part is located above the limiting part, the inner diameter of the expansion part is larger than the inner diameter of the limiting part, and multiple sheet die cores are arranged in the die cavity in a ring array, and two adjacent The core springs are connected between the sheet mold cores, and multiple sheet mold cores are slidably connected to the molding cavity. In the pre-stamping state, multiple sheet mold cores are located in the expansion part, and multiple core springs push multiple sheet mold cores away from each other to facilitate the placement of the drum surface tooth blank, and the push rod is passed through the drum surface tooth blank; in the stamping state, the external push tube pushes multiple sheet mold cores into the limiting part, and multiple sheet mold cores are close to each other to clamp the drum surface tooth blank, and the straight push tube cooperates with the internal push tube to punch flanges at both ends of the drum surface tooth blank.

9. A drum-shaped toothed special-shaped part forming process, using the drum-shaped toothed special-shaped part forming die according to any one of claims 1 to 8, characterized in that: The steps include: Cut the material into billets; Shaping the end surface of the blank to obtain a shaped blank; Extruding and punching holes in the shaped blank to obtain a punched blank; Punch through the hollow billet along the axial direction to obtain a straight billet; The straight tube billet is subjected to rod shrinkage, and after the rod shrinkage is completed, the intermediate material of the straight tube billet is squeezed outward to obtain a drum-shaped billet; Applying pressure to the drum surface of the drum-shaped blank to obtain a drum surface tooth-shaped blank; Pressure is applied to the two end rods of the drumhead tooth-shaped blank to form flanges at the two end rods to obtain a finished product.

10. The process for forming a drum-shaped toothed special-shaped part according to claim 9, characterized in that: Before the material is processed into a blank, it needs to be subjected to phosphating, wire drawing, spheroidizing annealing, phosphating, and fine drawing and sizing treatment in sequence.

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