Gear forging device and forging process thereof

Abstract

The present invention relates to the field of gear forging technology, and in particular to a gear forging device and a forging process thereof. The device includes a forging table, a mounting frame, a mounting box, a heating cylinder, a forging assembly, a support, a gear forging die, a forging adjustment assembly, and a manipulator. The heating cylinder is located on the mounting box; the forging assembly is arranged on the mounting box; the support is located on the forging table; the gear forging die is located on the support; the forging adjustment assembly is detachably covered on the gear forging die; and the manipulator is located on one side of the forging table. The present invention adopts a manufacturing process of central discharging, batch loading, layer-by-layer stacking, and segmented forging, which not only effectively prevents the high-temperature blank from splashing, intuitively grasps the forging effect, and ensures the safety and accuracy of the forging, but also provides a positioning function for the centering die through the through-channel, making the manufacturing of the gear shaft hole more accurate and convenient. Ultimately, the gear forging is made automatic, intelligent, efficient, and precise, meeting the needs of modern industry for gear processing.

Description

Technical Field

[0001] The present invention relates to the technical field of gear forging, and in particular to a gear forging device and a forging process thereof. Background Art

[0002] Gear forging is a key manufacturing process that utilizes the plastic deformation properties of metal to press a metal blank into the desired gear shape using dies and a press on a large forging press. This process alters the metal's internal structure and shape, achieving gear formation. Forged gears are widely used in various mechanical equipment, such as mining machinery, petrochemicals, and automotive manufacturing. Automotive manufacturing is a major application area for gear forgings, accounting for a significant portion of the total. With the continuous development and improvement of domestic gear manufacturing technology, the application areas of gear forgings are also expanding.

[0003] The Chinese patent document with authorization announcement number CN116159960B discloses a gear forging device for a gearbox with an automatic material changing function, including a machine tool, a forming device, an adjusting device, a press and a material-retrieving robot. The machine tool and the forming device are connected, the forming device and the adjusting device are connected, the adjusting device and the machine tool are tightly connected, the press housing and the machine tool are tightly connected, the press output end and the forming device are transmission-connected, the forming device includes a forming seat and a top block, the forming seat and the machine tool are tightly connected, a lifting groove is provided on the forming seat, the top block is placed in the lifting groove, the top block and the lifting groove are slidably connected, the material-retrieving robot is tightly connected to the machine tool, a shaping cavity is provided on the upper side of the lifting groove, and the shaping cavity is located within the rotation radius of the material-retrieving robot.

[0004] Existing gear forging technology has the following shortcomings: 1. Existing technology completes the feeding in one go, and the large amount of blanks is easy to accumulate, resulting in uneven internal forging. If forged repeatedly, it is easy to cool down, affecting the performance of the forged gear; 2. The forging end acts directly on the surface of the blank. When struck, the hot blank is easy to splash and overflow, causing certain safety hazards. The forging depth cannot be intuitively grasped, which is not conducive to forging processing of gears of different thicknesses; 3. The middle die is placed manually and lacks fixation and positioning, which is not conducive to ensuring forging accuracy. Summary of the Invention

[0005] To address the challenges of the prior art, a gear forging device and process are proposed. This device utilizes a manufacturing process that features central discharge, batch loading, layer-by-layer stacking, and segmented forging. This not only effectively prevents splashing of hot stock, allowing for intuitive control of the forging effect and ensuring forging safety and accuracy, but also provides a positioning function for the centering die via a through-channel, making gear shaft hole manufacturing more precise and convenient. Ultimately, this device makes gear forging automated, intelligent, efficient, and precise, meeting the demands of modern industry for gear processing.

[0006] The present invention provides a gear forging device, comprising a forging table, a mounting frame, a mounting box, a heating cylinder, a forging assembly, a support, a gear forging die, a forging adjustment assembly, and a manipulator. The forging table, the mounting frame, and the mounting box are connected in sequence from bottom to top; the heating cylinder is located on the mounting box and is used to heat the blank; the forging assembly is arranged on the mounting box, and its forging end can be raised and lowered, and can be switched from a suspended state to a horizontal state by flipping; in the suspended state, the heating cylinder works, and in the horizontal state, the forging end works; the support is located on the forging table, and its support end can be raised and lowered; the gear forging die is located on the support end of the support, and can be flipped and raised and lowered, and its position is opposite to the forging end of the forging assembly; the forging adjustment assembly is detachably covered on the gear forging die, and is used to transmit the pressure applied by the forging assembly to the blank inside the gear forging die, display the forging effect by reading the forging depth, and prevent the blank from splashing; and provide positioning for the center die by providing a through channel; the manipulator is located on one side of the forging table and is used for installing and removing the forging adjustment assembly and the center die.

[0007] Preferably, the forging assembly includes a mounting base located on the outer periphery of the heating cylinder; two groups of lifting drive parts are respectively on both sides of the mounting base, one group of lifting drive parts is connected to one side of the forging frame through a flip part, and the other group of lifting drive parts is movably connected to the other side of the forging frame through an adsorption part; the forging plate is located at the bottom of the forging frame.

[0008] Preferably, the mounting seat is rotatably connected to the mounting box; and the forging plate rotates synchronously with the mounting seat.

[0009] Preferably, two groups of mounting frames are provided; the gear forging die, the supporting end of the supporting member and the forging end of the forging assembly all move between the two groups of mounting frames.

[0010] Preferably, the forging adjustment assembly includes a forging adjustment member with a through-channel, a force-bearing member detachably arranged on the through-channel, a reading connection member located on the outer periphery of the through-channel, and a fixing member located on the gear forging die and cooperating with the reading connection member.

[0011] Preferably, the forged adjustment member includes a forging disk with a lower through hole and a connecting sleeve with an upper through hole located on the forging disk; the lower through hole and the upper through hole are coaxially connected to form a through channel; the through channel is consistent in size with the middle die.

[0012] Preferably, the force-bearing member includes a covering rod extending into the through-channel and a force-bearing seat located at the end of the covering rod.

[0013] Preferably, the reading connector includes an extension frame connected to the outer periphery of the adapter sleeve and a reading rod connected to the tail of the extension frame.

[0014] Preferably, the fixing members are arranged in a one-to-one correspondence with the L-shaped structures, and each set of fixing members is provided with a fixing hole for the reading rod to pass through.

[0015] The present invention further proposes a gear forging process, which uses the above-mentioned gear forging device for forging. The forging steps are as follows:

[0016] S1. The supporting end of the support rises synchronously with the gear forging die to close to the heating cylinder, and part of the blank flows out and enters the gear forging die;

[0017] S2. The supporting end of the support member and the gear forging die descend synchronously; the manipulator installs the forging adjustment component on the gear forging die;

[0018] S3, the forging end of the forging assembly is flipped from the hanging state to the horizontal state, and the forging adjustment assembly is pressed downward to forge the blank;

[0019] S4. After completing one forging, the manipulator removes the forging adjustment component and repeats the above steps to start the second feeding and forging;

[0020] S5. Load materials in batches, stack them layer by layer, and perform double-sided forging layer by layer by turning the gear forging die. Then, read the forging depth displayed by the forging adjustment component to control the forging effect.

[0021] S6. After completing the preliminary forging, the manipulator extends the middle die from the top into the through-channel of the forging adjustment assembly;

[0022] S7, the forging end of the forging assembly acts to forge the gear shaft hole;

[0023] S8. Remove the forging adjustment assembly and complete the gear forging.

[0024] Compared with the prior art, the present invention has the following beneficial technical effects: a forging plate that can be flipped and lifted is provided, which can freely switch between the suspended state and the horizontal state, and cooperate with the gear forging die to move up and down, so as to realize central discharge, batch loading, and layer-by-layer stacking, thereby avoiding the situation where the blank cools too quickly and the forging is uneven due to excessive feeding at one time. A manipulator is provided to operate the forging adjustment component and the middle die, thereby improving the safety and intelligence of the forging process. The forging adjustment component with a split structure is detachably covered on the gear forging die. On the one hand, the pressure applied by the forging component is better transmitted to the blank inside the gear forging die through the combination of the forging adjustment part and the force-bearing part, so as to carry out layer-by-layer forging, which can not only prevent the high-temperature blank from splashing and ensure safety, but also can read the displacement data through the reading connector to intuitively grasp the forging effect, thereby ensuring the flexibility and accuracy of the forging. On the other hand, by splitting the forging adjustment part and the force-bearing part, the through-channel is exposed to provide a positioning function for the middle die, making the gear shaft hole manufacturing more accurate and convenient. Through the combination and linkage of the above structures, gear forging is ultimately made automatic, intelligent, efficient and precise, meeting the needs of modern industry for gear processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the gear forging device structure of the present invention (viewing angle 1);

[0026] Figure 2 Schematic diagram of the gear forging device structure of the present invention (viewpoint 2);

[0027] Figure 3 Schematic diagram of the structure of the forging assembly in the present invention;

[0028] Figure 4 for Figure 3 A in the middle is an enlarged schematic diagram;

[0029] Figure 5 for Figure 1 The enlarged schematic diagram of point B in the middle;

[0030] Figure 6 for Figure 1 The enlarged schematic diagram of point C in the middle;

[0031] Figure 7 Schematic diagram of the structure of the gear forging die and forging adjustment assembly in the present invention;

[0032] Figure 8 This is a schematic diagram of the disassembled structure of the forging adjustment component in the present invention.

[0033] Reference numerals: 1, forging table; 2, mounting frame; 201, through slot; 202, slide; 3, mounting box; 4, gear forging die; 401, fixing member; 5, forging adjustment assembly; 501, forging adjustment member; 501a, forging disk; 501b, connecting sleeve; 501c, reinforcing plate; 501d, upper through hole; 502, force-bearing member; 502a, force-bearing seat; 502b, covering rod; 503, reading connection member; 503a, extension frame; 5 03b, reading rod; 6, heating tube; 7, forging assembly; 701, forging frame; 702, forging plate; 703, mounting seat; 704, lifting drive part 1; 705, metal head; 706, motor 1; 707, rotating frame; 708, gear 1; 709, gear 2; 710, motor 2; 711, electromagnetic suction sleeve; 8, manipulator; 9, driving part; 901, lifting block; 902, slide rail; 903, motor 3; 10, supporting part. DETAILED DESCRIPTION

[0034] Example 1, as Figure 1-Figure 2As shown, a gear forging device proposed in the present invention includes a forging table 1, a mounting frame 2, a mounting box 3, a heating cylinder 6, a forging assembly 7, a support 10, a gear forging die 4, a forging adjustment assembly 5 and a manipulator 8. The forging table 1, the mounting frame 2 and the mounting box 3 are connected in sequence from bottom to top; the heating tube 6 is located on the mounting box 3 and is used to heat the blank; the forging assembly 7 is arranged on the mounting box 3, and the forging end can be raised and lowered, and can be switched from a suspended state to a horizontal state by flipping; in the suspended state, the heating tube 6 works, and in the horizontal state, the forging end works; the support 10 is located on the forging table 1, and the support end can be raised and lowered; the gear forging die 4 is located on the support end of the support 10, which can be flipped and raised and lowered, and its position is opposite to the forging end of the forging assembly 7; the forging adjustment assembly 5 is detachably covered on the gear forging die 4. On the one hand, it is used to transfer the pressure applied by the forging assembly 7 to the blank inside the gear forging die 4, display the forging effect by reading the forging depth, and prevent the blank from splashing. On the other hand, it provides positioning for the center die by setting a through channel; the manipulator 8 is located on one side of the forging table 1 and is used for installing and disassembling the forging adjustment assembly 5 and the center die.

[0035] like Figure 3-Figure 4 As shown, the forging assembly 7 includes a mounting base 703 located on the outer periphery of the heating cylinder 6; two groups of lifting drive members 704 are respectively on both sides of the mounting base 703, one group of lifting drive members 704 is connected to one side of the forging frame 701 through a rotating flip member, and the other group of lifting drive members 704 is connected to the other side of the forging frame 701 through an adsorption member; the forging plate 702 is located at the bottom of the forging frame 701.

[0036] It should be further explained that the forging plate 702 is the forging end, which is used to apply force to the forging adjustment component 5. The lifting drive member 1 704 is a cylinder structure, which drives the forging plate 702 to rise and fall through the telescopic rod to complete the forging.

[0037] It needs to be further explained that, Figure 4 As shown, the turning part includes a motor 706 located on a set of cylinder telescopic rods; a rotating frame 707 rotatably connected to the main shaft of the motor 706 is provided on the forging frame 701.

[0038] It needs to be further explained that, Figure 3 As shown, the adsorption member includes a metal head 705 located on another set of cylinder telescopic rods; an electromagnetic suction sleeve 711 is provided on the forging frame 701 to cooperate with the metal head 705. The cooperation here includes magnetic attraction and snap-fitting.

[0039] When unloading is required, the electromagnetic suction sleeve 711 is de-energized, losing its magnetism. Motor 1 706 drives the rotating frame 707, shifting the forging frame 701 from a horizontal position to a suspended position, exposing the discharge port of the heating cylinder 6 and commencing the feeding process. After receiving the material, the forging frame 701 returns to a horizontal position, and the electromagnetic suction sleeve 711 is energized to attract and engage the metal head 705. By discharging and receiving the material in batches from the center, the blank is evenly distributed, facilitating forging. It also facilitates the layer-by-layer forging process, ensuring the best forging results.

[0040] like Figure 1 and Figure 5 As shown, the mounting base 703 is rotatably connected to the mounting box 3; the forging plate 702 rotates synchronously with the mounting base 703. The mounting base 703 is annular, with a gear 1 708 disposed on its outer periphery. The mounting box 3 is provided with a gear 2 709 driven by a motor 2 710. Gear 2 709 meshes with gear 1 708 to transmit the rotation of the mounting base 703. During forging, the forging plate 702 rotates with the mounting base 703, ensuring uniform forging force and achieving a better forging effect.

[0041] like Figure 1 and Figure 6 As shown, two groups of mounting frames 2 are provided; the gear forging die 4, the supporting end of the support member 10 and the forging end of the forging assembly 7 all move between the two groups of mounting frames 2; the mounting frames 2 play a role of protection and guidance.

[0042] The support member 10 comprises a lifting cylinder and a support plate that is driven up and down by the cylinder. The support plate is slidably connected to the mounting brackets 2 on either side. The support plate, here referred to as the support end, is primarily used to seal the bottom of the gear forging die 4 to prevent leakage during feeding and forging.

[0043] like Figure 6 As shown, the mounting frame 2 is equipped with a drive member 9 that drives the gear forging die 4 to rise and fall and rotate. A vertical through-slot 201 is provided on the mounting frame 2. The drive member 9 includes a lead screw driven by a second motor to rotate the lead screw disposed in the through-slot 201. A lifting block 901 extends through the through-slot 201 and is threadedly connected to the lead screw for vertical movement. The rear end of the lifting block 901 is provided with a slider that slides into the mounting frame 2, and the front end is provided with a third motor 903 that drives the gear forging die 4 to rotate.

[0044] It should be further explained that the slider is provided with a slide rail 902 that matches the slide groove 202 .

[0045] The gear forging die 4 is adjusted in position by lifting before and after feeding, and is adjusted in position by rotating during forging, making the entire forging process more automatic and efficient.

[0046] like Figure 7As shown, the forging adjustment assembly 5 includes a forging adjustment part 501 with a through channel, a force-bearing part 502 detachably arranged on the through channel, a reading connection part 503 located on the outer periphery of the through channel, and a fixing part 401 located on the gear forging die 4 and cooperating with the reading connection part 503.

[0047] Before forging, the forging adjustment component 5 is fixed and covered on the upper end of the gear forging die 4 by cooperating with the reading connector 503 and the fixing member 401. At this time, the force-bearing member 502 is installed on the through-channel. By hitting the force-bearing member 502 with the forging end of the forging assembly 7, the forging force can be transferred to the forging adjustment member 501, and finally acts on the blank. At this time, the reading connector 503 drops synchronously with the forging adjustment member 501, and its displacement data can be used to show the change in forging depth. When the middle die is needed, the force-bearing member 502 is taken out to expose the through-channel, and the middle die can be positioned in the through-channel to facilitate the subsequent creation of the gear shaft hole. After forging is completed, the forging adjustment component 5 is removed.

[0048] like Figure 8 As shown, the forged adjustment member 501 includes a forged disk 501a with a lower through hole and a connecting sleeve 501b with an upper through hole 501d located on the forged disk 501a.

[0049] It should be further explained that the lower through hole and the upper through hole 501d are coaxially connected to form a through channel; the through channel is consistent with the size of the middle mold;

[0050] It should be further explained that the outer periphery of the connecting sleeve 501b is also provided with reinforcing pieces 501c for grasping by the manipulator 8. The reinforcing pieces 501c are dispersedly arranged in a circle, and each group of reinforcing pieces 501c is provided with grasping holes to facilitate grasping by the manipulator 8 and to enhance the firmness of the forged adjustment piece 501.

[0051] like Figure 8 As shown, the force-bearing member 502 includes a covering rod 502b extending into the through channel and a force-bearing seat 502a located at the end of the covering rod 502b.

[0052] It should be further explained that the rod wall of the covering rod 502b is in contact with the inner wall of the through channel, and the bottom end is flush with the orifice of the lower through hole. Through this arrangement, the blank can be reduced from entering the through channel and overflow can be avoided.

[0053] It should be further explained that the force-bearing seat 502a is circular and, together with the forging plate 501a and the adapter sleeve 501b, forms an I-shaped cross-section. A ring 502c is provided on the outer periphery of the force-bearing seat 502a for gripping by the robot arm 8. The I-shaped structure has a small force-bearing area but transmits high pressure, ensuring the forging effect. The reinforcement plate 501c, located between the force-bearing seat 502a and the forging plate 501a, further enhances the structural robustness.

[0054] like Figure 8 As shown, the reading connection member 503 includes an extension frame 503a connected to the outer periphery of the connecting sleeve 501b and a reading rod 503b connected to the tail of the extension frame 503a.

[0055] It should be further explained that the extension frame 503a and the reading rod 503b form an L-shaped structure, and multiple groups of L-shaped structures are combined into a downward claw-shaped structure.

[0056] It should be further explained that a displacement sensor can be provided on the reading rod 503b and a scale can be provided to intuitively obtain the displacement data of the forging disk 501a.

[0057] like Figure 8 As shown, the fixing members 401 are arranged in a one-to-one correspondence with the L-shaped structures, and each set of fixing members 401 is provided with a fixing hole for the reading rod 503b to pass through.

[0058] It should be further explained that the fixing hole can be used to engage the reading rod 503b to fix the forged adjustment member 501, and can also assist the reading rod 503b in reading.

[0059] Example 2: This example proposes a gear forging process. The process uses the gear forging device described in Example 1 for forging. The forging steps are as follows:

[0060] S1, the support plate of the support member 10 rises synchronously with the gear forging die 4 to be close to the heating cylinder 6, and part of the blank flows out and enters the gear forging die 4;

[0061] S2. The support plate of the support member 10 and the gear forging die 4 are lowered synchronously; the manipulator 8 grabs the reinforcing plate 501c, aligns the reading rod 503b of the forging adjustment assembly 5 with the fixing hole, and moves it downward to engage and install it on the gear forging die 4;

[0062] S3. Motor 1 706 drives the rotating frame 707 to rotate, transforming the forging frame 701 from a suspended state to a horizontal state. The electromagnetic suction sleeve 711 is energized to generate magnetism, attracting and engaging the metal head 705. The forging plate 702 descends, applying force to the force-bearing seat 502a to forge. During the forging process, the displacement data of the reading rod 503b is recorded to monitor the forging status.

[0063] S4. After completing one forging operation, the manipulator 8 removes the forging adjustment assembly 5 and repeats the above steps to start the second feeding and forging operation.

[0064] S5. Load the materials in batches, stack them layer by layer, and perform double-sided layer-by-layer forging by turning the gear forging die 4. Then, read the forging depth displayed by the forging adjustment component 5 to control the forging effect.

[0065] S6. After completing the preliminary forging, the manipulator 8 grabs the ring 502c, removes the force-bearing member 502, and inserts the middle die from the top into the through-channel of the forging adjustment assembly 5;

[0066] S7, forging plate 702 of forging assembly 7 forges the gear shaft hole;

[0067] S8. Remove the forging adjustment component 5 to complete the gear forging.

[0068] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A gear forging device, characterized in that: include: A forging table (1), a mounting frame (2) and a mounting box (3) connected sequentially from bottom to top; A heating cylinder (6), located on the mounting box (3), is used to heat the blank; The forging assembly (7) is arranged on the mounting box (3), and the forging end can be raised and lowered, and can be switched from a suspended state to a horizontal state by flipping; in the suspended state, the heating cylinder (6) works, and in the horizontal state, the forging end works; A support member (10) is located on the forging table (1), and the support end can be raised and lowered; A gear forging die (4) is located on the supporting end of the support member (10), can be turned over and raised, and is positioned opposite to the forging end of the forging assembly (7); A forging adjustment component (5) is detachably covered on the gear forging die (4). On the one hand, it is used to transmit the pressure applied by the forging component (7) to the blank inside the gear forging die (4), display the forging effect by reading the forging depth, and prevent the blank from splashing. On the other hand, it provides positioning for the centering die by setting a through channel; and a manipulator (8), located on one side of the forging table (1), for installing and removing the forging adjustment component (5) and the middle die; The forging assembly (7) includes a mounting seat (703) located on the outer periphery of the heating cylinder (6); two groups of lifting drive members (704) are respectively located on both sides of the mounting seat (703), one group of lifting drive members (704) is rotatably connected to one side of the forging frame (701) through a flip member, and the other group of lifting drive members (704) is movably connected to the other side of the forging frame (701) through an adsorption member; the forging plate (702) is located at the bottom of the forging frame (701); the flip member includes a motor (706) located on a group of cylinder telescopic rods; a rotating frame (707) rotatably connected to the main shaft of the motor (706) is provided on the forging frame (701); the adsorption member includes a metal head (705) located on the other group of cylinder telescopic rods; and an electromagnetic suction sleeve (711) is provided on the forging frame (701) to cooperate with the metal head (705); The forging adjustment assembly (5) includes a forging adjustment member (501) with a through-channel, a force-bearing member (502) detachably arranged on the through-channel, a reading connection member (503) located on the periphery of the through-channel, and a fixing member (401) located on the gear forging die (4) and cooperating with the reading connection member (503); The gear forging process steps are as follows: S1, the supporting end of the support member (10) rises synchronously with the gear forging die (4) to a position close to the heating cylinder (6), and part of the blank flows out and enters the gear forging die (4); S2, the supporting end of the support member (10) and the gear forging die (4) are synchronously lowered; the manipulator (8) installs the forging adjustment component (5) on the gear forging die (4); S3, the forging end of the forging assembly (7) is flipped from the hanging state to the horizontal state, and force is applied to the forging adjustment assembly (5) by pressing downward to forge the blank; S4. After completing one forging, the manipulator (8) removes the forging adjustment component (5) and repeats the above steps to start the second feeding and forging; S5, by loading materials in batches, stacking materials layer by layer, coordinating with the gear forging die (4) to flip, performing double-sided layer-by-layer forging, and then coordinating with reading the forging depth displayed by the forging adjustment component (5) to control the forging effect; S6. After the initial forging is completed, the manipulator (8) extends the middle die from the top into the through-channel of the forging adjustment assembly (5); S7, the forging end of the forging assembly (7) acts to forge the gear shaft hole; S8. Remove the forging adjustment assembly (5) to complete the gear forging.

2. The gear forging device according to claim 1, characterized in that: The mounting seat (703) is rotatably connected to the mounting box (3); the forging plate (702) rotates synchronously with the mounting seat (703).

3. The gear forging device according to claim 1, characterized in that: Two groups of mounting frames (2) are provided; the gear forging die (4), the supporting end of the supporting member (10) and the forging end of the forging assembly (7) all move between the two groups of mounting frames (2).

4. The gear forging device according to claim 1, characterized in that: The forged adjustment member (501) comprises a forged disk (501a) with a lower through hole and a connecting sleeve (501b) with an upper through hole (501d) located on the forged disk (501a); the lower through hole and the upper through hole (501d) are coaxially connected to form a through channel; the through channel is consistent in size with the middle die.

5. The gear forging device according to claim 4, characterized in that: The force-bearing member (502) comprises a covering rod (502b) extending into the through-channel and a force-bearing seat (502a) located at the end of the covering rod (502b).

6. The gear forging device according to claim 5, characterized in that: The reading connection member (503) includes an extension frame (503a) connected to the outer periphery of the connection sleeve (501b) and a reading rod (503b) connected to the tail of the extension frame (503a); The extension frame (503a) and the reading rod (503b) form an L-shaped structure, and multiple groups of L-shaped structures are combined into a downward claw-shaped structure.

7. The gear forging device according to claim 6, characterized in that: The fixing members (401) are arranged in a one-to-one correspondence with the L-shaped structures, and each set of fixing members (401) is provided with a fixing hole for the reading rod (503b) to pass through.

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