Isothermal forging forming process and device applied to large wind power main shaft forge piece

Abstract

The invention discloses an isothermal hot forging forming process and device applied to large wind power main shaft forgings, and relates to the technical field of main shaft heat treatment. And step-by-step forging and pressing forming of the forge piece is realized by matching transmission of a wedge-shaped pressing block group and an inclined wedge surface of a pressed sliding seat, multi-point pressure application of an air hammer power assembly and directional deflection of a rotary power assembly, and the process core is as follows: the forge piece is positioned and clamped after being heated; according to the method, the problems that in traditional hot forging, deformation is uneven, cracking is likely to happen, and toughness is insufficient are solved through structural collaboration and process optimization aiming at the pain points that a large wind power main shaft forged piece is large in size and high in relevance between temperature and deformation quantity, and the large wind power main shaft forged piece is formed through continuous actions of lateral surrounding positioning, overall blowing pressing, multi-point secondary hammering pressing and directional deflection circulation. Forge piece forming precision and mechanical performance are remarkably improved, and meanwhile hot forging production efficiency is improved.

Description

Isothermal hot forging process and equipment for large wind turbine main shaft forgings Technical Field

[0001] This invention relates to the field of spindle heat treatment technology, specifically to an isothermal hot forging process and apparatus for large wind turbine spindle forgings. Background Technology

[0002] Hot forging is a process in which a billet is continuously impacted and forged by a press under high temperature conditions. The key steps are the heat treatment process and the die forging stage (main deformation). The technical essence is to use a hydraulic press as a power component to continuously hammer the workpiece heated to a certain temperature. For more information, please refer to the relevant content in publication number CN120551317A.

[0003] The structure of large wind turbine main shaft forgings needs to be explained. Due to their large size, the following points need to be considered in the die forging process: Under the premise of relatively stable hammering force / frequency, the influence between temperature and deformation must be considered. Firstly, under high temperature conditions, the metal's plasticity increases / deformation resistance decreases, making it easier to deform. However, during the actual hammering process, the temperature decreases, affecting the metal's plasticity / deformation resistance, and even causing cracks on the surface or in the core of the forging, especially in areas of abrupt cross-section change or stress concentration. Secondly, under temperature fluctuation conditions, the degree of deformation is uneven due to temperature fluctuations, or there are differences in the cooling efficiency of the workpiece after forging. Recrystallization softening cannot keep up with work hardening, resulting in some areas retaining cold-deformed structures, which increases strength but severely reduces toughness.

[0004] In view of the above, the present invention proposes a solution. Summary of the Invention

[0005] The purpose of this invention is to provide an isothermal hot forging process and apparatus for large wind turbine main shaft forgings. For the high-temperature hot forging process of large wind turbine main shaft forgings, since the forging workpiece is relatively large, there is a direct correlation between its temperature and deformation, which affects the hot forging efficiency and the degree of deformation.

[0006] The objective of this invention can be achieved through the following technical solution: an isothermal hot forging device for large wind turbine main shaft forgings, comprising a hydraulic power cylinder, an upper pressure seat, a lower base and a main support bracket, wherein the lower base is installed on the lower side of the main support bracket, and the upper pressure seat is linearly moved along the vertical direction corresponding to the lower base by the hydraulic power cylinder;

[0007] The upper pressure seat and the lower base are respectively equipped with upper arc blocks and lower arc blocks at corresponding positions, and the upper arc blocks and the lower arc blocks form the forging curved surface of the corresponding spindle forging;

[0008] The lower base is provided with a pressure-bearing slide and a cooperating arc-shaped support block on both sides of the lower arc block. The upper pressure seat is equipped with a wedge-shaped pressure block assembly corresponding to the pressure-bearing slide, and the upper pressure seat is equipped with a pneumatic hammer power assembly corresponding to the upper arc block.

[0009] The configuration is further defined as follows: the pressure-bearing slide is slidably connected to the lower base along the length direction perpendicular to the upper arc block, and a tension spring assembly is provided between the lower side of the pressure-bearing slide and the lower base.

[0010] Further configuration: the wedge-shaped pressure block assembly consists of multiple inclined wedge blocks, the inclined wedge blocks and the pressure-bearing slide form an inclined wedge surface transmission mode, the cooperating arc-shaped support block is located in the middle position between the pressure-bearing slide and the lower arc block, and the end position of the pressure-bearing slide corresponding to the cooperating arc-shaped support block is set as a curved surface contact position.

[0011] Further configuration: limit blocks are provided on both sides of the upper arc block, and the cooperating arc support block, limit block and upper arc block are equidistant or non-equidistant along the length direction of the main shaft forging.

[0012] The configuration is further defined as follows: a clearance space is provided between the cooperating arc-shaped support block and the lower arc block, and between the upper arc block and the limiting block on the side that are close to each other, and the multiple cooperating arc-shaped support blocks are rotatably connected in the lower base along the length direction of the main shaft forging.

[0013] A further configuration is provided: a ball joint is provided at the center point of the upper surface of each of the upper arc blocks corresponding to the air hammer power assembly.

[0014] The upper arc block is further configured such that arc-shaped spring strips are symmetrically distributed along the length of the main shaft forging, with the ball joint connecting rod as the base point. The two ends of the arc-shaped spring strips extend into the limiting block and are fixedly connected to the limiting block.

[0015] A further configuration is provided: a rotary power assembly is installed on one side of the outer wall of the main bearing bracket corresponding to the length direction of the main shaft forging.

[0016] This invention also proposes an isothermal hot forging process for large wind turbine main shaft forgings. After heating the main shaft forging to the process temperature, it is placed on the lower arc block in the lower base, and one end of the main shaft forging is connected to the rotary power assembly. The following actions are performed by a hydraulic power cylinder:

[0017] Action 1: The wedge-shaped pressure block assembly contacts the pressure slide block before the upper arc block contacts the main shaft forging, causing the pressure slide block to slide towards the main shaft forging at the same time, and causing the cooperating arc-shaped support block to deflect in the direction closer to the main shaft forging;

[0018] Action 2: The upper pressure seat continues to move downward through the hydraulic power cylinder, and multiple upper arc blocks complete the blowing and pressing action on the main shaft forging. The pressure slide continues to move closer to the main shaft forging, providing lateral pressure to the side curved surface of the main shaft forging.

[0019] Action 3: While Action 2 is completed, the pneumatic hammer power assembly provides different pressures to multiple upper arc blocks. While the upper pressure seat remains relatively stationary, the upper arc blocks perform multi-point secondary hammering on the spindle forging.

[0020] Action 4: After completing Action 3, the upper pressure seat returns to its original position, and the rotating power assembly drives the main shaft forging to rotate at a fixed angle, and continues to repeat Action 1 to Action 3.

[0021] The present invention has the following beneficial effects:

[0022] 1. Through the transmission of the wedge-shaped pressure block assembly and the inclined wedge surface of the pressure slide, the cooperating arc-shaped support block is driven to form a three-dimensional constraint structure of "bottom support + two-sided embrace". With the guiding effect of the limit block, the lateral flow and displacement of the high-temperature forging are effectively suppressed. The air hammer power component realizes multi-point differentiated secondary hammering through the ball joint connecting rod, which can accurately compensate for the deformation difference in different areas. It solves the problem of uneven deformation caused by temperature fluctuation in traditional hot forging, so that the dimensional accuracy and microstructure density of each part of the forging are consistent, and forming defects such as "bulging" and "flash" are avoided.

[0023] 2. The built-in arc-shaped spring in the upper arc block can buffer the instantaneous impact force of forging. The adaptive transmission design of the ball joint reduces local stress concentration. Combined with the deformation buffering effect of the clearance, it significantly reduces the risk of surface and core cracking of the forging, while avoiding residual cold deformation structure and ensuring the balance of strength and toughness of the forging. The adaptive reset of each component and the directional deflection of the rotary power assembly realize a continuous cycle process of "positioning-forging-compensation-deflection", reducing the number of times the billet is repeatedly heated, improving production continuity and stability, and greatly improving hot forging efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 is a schematic diagram of the isothermal hot forging device for large wind turbine main shaft forgings proposed in this invention.

[0026] Figure 2 is a side front view of Figure 1 of the present invention;

[0027] Figure 3 is a schematic diagram of the structure of the lower base in Figure 1 of the present invention;

[0028] Figure 4 is a partial cross-sectional view of Figure 3 of the present invention;

[0029] Figure 5 is a schematic diagram of the upper pressure seat in Figure 1 of the present invention;

[0030] Figure 6 is a cross-sectional view of Figure 5 of this invention;

[0031] Figure 7 is a cross-sectional view of the arc-shaped spring strip corresponding to the upper arc block and the limiting block in Figure 6 of the present invention.

[0032] In the diagram: 1. Hydraulic power cylinder; 2. Upper pressure seat; 3. Lower base; 4. Main support bracket; 5. Rotary power assembly; 6. Wedge-shaped pressure block assembly; 7. Pressure-bearing slide; 8. Cooperative arc-shaped support block; 9. Lower arc block; 10. Upper arc block; 11. Limit block; 12. Pneumatic hammer power assembly; 13. Ball joint connecting rod; 14. Arc-shaped spring. Detailed Implementation

[0033] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1: For the high-temperature hot forging process of large wind turbine main shaft forgings, due to the relatively large size of the forging workpiece, there is a direct correlation between temperature and deformation, which affects hot forging efficiency and the degree of deformation. The following technical solution is proposed:

[0035] Referring to Figures 1-7, the isothermal hot forging device for large wind turbine main shaft forgings in this embodiment includes a hydraulic power cylinder 1, an upper pressure seat 2, a lower base 3, and a main support bracket 4. The lower base 3 is installed on the lower side of the main support bracket 4, and the upper pressure seat 2 moves linearly along the vertical direction corresponding to the lower base 3 via the hydraulic power cylinder 1.

[0036] Upper pressure seat 2 and lower base 3 are respectively equipped with upper arc block 10 and lower arc block 9 at corresponding positions, and the upper arc block 10 and lower arc block 9 form the forging curved surface of the corresponding spindle forging;

[0037] The lower base 3 is provided with a pressure-bearing slide 7 and a cooperating arc-shaped support block 8 on both sides of the lower arc block 9. The upper pressure base 2 is equipped with a wedge-shaped pressure block group 6 corresponding to the pressure-bearing slide 7, and the upper pressure base 2 is equipped with a pneumatic hammer power assembly 12 corresponding to the upper arc block 10.

[0038] Basic Principle Explanation: A simple explanation of the hot forging process of forgings is as follows: First, the blank is cut according to the process requirements to obtain the billet. Then, the billet is heated to the process temperature and finally placed in a hammering structure composed of a hydraulic press. Taking Figure 2 as an example, under the hydraulic action of the hydraulic press, the upper pressure seat 2 moves downward periodically at a certain frequency. Between the upper pressure seat 2 and the lower base 3, there is a structure such as a pressure block or pressure cavity corresponding to the shape of the forging. The heated billet is hammered into the corresponding shape through multiple hammering processes. After the billet temperature drops, it needs to be put back into the furnace for heating until the hot forging process of the billet is completed. The above part is the basic principle of the hot forging process of forgings.

[0039] This invention primarily targets large-sized forgings such as wind turbine main shaft forgings. If the pressure block used is a constant structure, during the actual continuous hammer pressing process, the forming dimensions of the main shaft forging may deviate due to temperature and deformation differences in certain areas, or local cracking may occur due to excessive hot forging pressure. Referring to the lower arc block 9 in Figure 4 and the upper arc block 10 in Figure 5, these are the key pressure structures in the hot forging process. The lower arc block 9 is essentially the basic structure supporting the main shaft forging, while the cooperating arc-shaped pressure block 9 also provides lateral support to the main shaft forging. The key is that the upper arc block 10 can adjust according to the main shaft forging... The shaft's outer profile curve is divided into multiple units, and the limiting block 11 also works with the upper arc block 10 to provide downward lateral support. However, the limiting block 11 does not serve as the forging pressure structure in the overall hot forging process. Secondly, an independent hydraulic power cylinder 1 and a pneumatic hammer power assembly 12 are added relative to the upper pressure seat 2 to generate downward pressure using compressed air. The key point is that each upper arc block 10 can perform independent downward pressing actions on the left and right sides of the pneumatic hammer power assembly 12, thereby providing downward pressure to different positions of the spindle forging. This avoids excessive local stress leading to cracking / excessive deformation, or insufficient pressure to meet the hot forging requirements.

[0040] Example 2: Based on the technical content of Example 1, the pressure-bearing slide 7 at the lower arc block 9 will be explained first, and then the operation process of the upper arc block 10 will be supplemented:

[0041] The pressure-bearing slide 7 forms a sliding connection with the lower base 3 along a direction perpendicular to the length of the upper arc block 10. The tension spring assembly between its lower side and the lower base 3 constitutes the reset base. The wedge-shaped pressure block group 6 and the wedge surface formed by the multiple wedge blocks and the pressure-bearing slide 7 form the core structure for realizing power transmission.

[0042] When the hydraulic power cylinder 1 drives the upper pressure seat 2 to move downward, the wedge-shaped pressure block group 6 contacts the pressure-bearing slide 7 before the upper arc block 10. The inclined surface conduction characteristics of the wedge surface convert the vertical pressure of the upper pressure seat into a horizontal thrust of the pressure-bearing slide 7 towards the spindle forging, causing the pressure-bearing slide to slide synchronously towards the spindle forging. At this time, the curved surface contact position at the end of the pressure-bearing slide 7 forms a flexible fit transmission with the cooperating arc-shaped support block 8, pushing the cooperating arc-shaped support block 8 to deflect in the direction closer to the spindle forging. This operation process directly brings dual technical effects: First, the cooperating arc-shaped support block 8 and the lower arc block 9 form a "bottom support + two-sided embrace" enclosed positioning, avoiding the forming deviation caused by the weight or force offset of the large spindle forging in the early stage of forging, especially suitable for the stable clamping requirements of large-sized workpieces; Second, the design of the curved surface contact position reduces stress concentration in the transmission process, prevents wear caused by rigid contact between the cooperating arc-shaped support block and the pressure-bearing slide, and extends the service life of the components.

[0043] During the subsequent downward movement of the upper pressure seat, the pressure-bearing slide 7 maintains a tendency to move closer to the main shaft forging under the continuous action of the wedge-shaped pressure block assembly, applying continuous and uniform lateral pressure to the side curved surface of the main shaft forging. This continuous pressure, combined with the bottom support of the lower arc block 9, ensures that the main shaft forging is always in a "three-dimensional constraint" state during the forging process, effectively counteracting the lateral flow tendency of the metal material at high temperature and avoiding forming defects such as "bulging" and "flash" in the forging. At the same time, the preload of the tension spring assembly and the lateral pressure form a dynamic balance, which can adaptively adjust the pressure according to the real-time deformation of the main shaft forging, ensuring that the lateral pressure is sufficient to constrain the deformation without causing scratches on the surface of the forging due to excessive pressure.

[0044] When the forging is completed and the upper pressure seat is reset, the pressure of the wedge-shaped pressure block group 6 on the pressure slide 7 is released, and the tension spring assembly immediately pulls the pressure slide 7 to reset. The cooperating arc-shaped support block 8 returns to its initial position under the reaction force after it separates from the forging due to its own weight, preparing for the next forging cycle. This reset mechanism ensures the continuity and efficiency of the process operation.

[0045] The upper arc block 10 is the core forging component that directly acts on the spindle forging. Its action process consists of "overall downward pressing + multi-point secondary hammer pressing", and it works in coordination with the limit block 11, the arc-shaped spring 14, and the air hammer power assembly 12.

[0046] In the second action, the upper pressure seat 2 continues to move downward via the hydraulic power cylinder 1, and multiple upper arc blocks 10 simultaneously contact the main shaft forging and complete the overall blowing action. At this time, the limiting blocks 11 on both sides of the upper arc block 10 play a key guiding and limiting role. The clearance between them and the upper arc block 10 not only avoids contact friction between the two, but also limits the lateral displacement of the upper arc block 10, ensuring that the forging surface accurately fits the shape of the main shaft forging and guaranteeing the dimensional accuracy of the forging. At the same time, the arc-shaped spring strips 14 symmetrically distributed inside the upper arc block 10 with the ball joint connecting rod 13 as the base point are fixed at both ends in the limiting blocks 11. During the overall blowing process, the arc-shaped spring strips 14 undergo elastic deformation, which can buffer the instantaneous pressure transmitted by the upper pressure seat and avoid impact cracks on the surface of the forging due to a sudden increase in pressure. This is especially suitable for the stress buffering requirements of the cross-sectional abrupt change area of ​​large wind turbine main shaft forgings.

[0047] In Action 3, the pneumatic hammer power assembly 12 is activated after the overall blowing and pressing is completed. It applies pressure to the center point of the upper surface of the upper arc block 10 through the ball joint connecting rod 13. The structure of the ball joint connecting rod makes the pressure transmission more concentrated and has a certain angle self-adaptation capability, avoiding uneven force on the upper arc block 10. Since each upper arc block 10 corresponds to an independent pneumatic hammer power assembly 12, it can provide differentiated pressure according to the deformation requirements of different areas of the main shaft forging, realizing multi-point secondary hammer pressing. For example, the hammer pressure is increased for areas with insufficient deformation, and the pressure is reduced for areas with stress concentration. This "precise pressure compensation" mode effectively solves the problem of uneven deformation in traditional overall forging and ensures that the microstructure density of each part of the forging is consistent.

[0048] Meanwhile, the arc-shaped spring 14 plays an elastic reset and auxiliary buffering role during the secondary hammering process: when the pneumatic hammer power component applies pressure, the arc-shaped spring further deforms to store elastic potential energy; when the pressure is released, the release of elastic potential energy pushes the upper arc block 10 to rebound quickly, storing power for the next hammering, which not only increases the hammering frequency, but also reduces the risk of adhesion between the upper arc block and the forging. In addition, the clearance between the cooperating arc-shaped support block 8 and the lower arc block 9 provides a buffer space for the small deformation of the forging during the secondary hammering, avoiding the internal stress generated by the forging due to the limited deformation, and ensuring the toughness of the forging.

[0049] To supplement the overall hammering process: continuous hammering of a single position on the main shaft forging is not possible. Therefore, in action four, after the upper pressure seat 2 returns to its original position, the rotating power component 5 on the main bearing bracket 4 drives the main shaft forging to deflect at a fixed angle. Then, actions one through three are repeated. During this cycle, the actions of the pressure slide, the cooperating arc-shaped support block, and the upper arc block are synchronized with the deflection angle of the forging. The rotating connection design of the cooperating arc-shaped support block along the length of the main shaft forging allows it to adaptively adjust the support angle as the forging deflects, always maintaining close support to the forging. The equidistant or non-equidistant spacing of the limiting block 11, the upper arc block 10, and the cooperating arc-shaped support block can optimize the support and forging points according to the structural characteristics of different length areas of the forging, ensuring the overall forming consistency of long forgings.

[0050] The above content is supplemented by the following: The "positioning-forging-compensation-deflection" cyclic mode proposed in this invention, combined with the coordinated operation of various components, ultimately achieves three key technical effects: First, through three-dimensional constraints and precise compensation, it solves the problem of decreased plasticity and uneven deformation in large wind turbine main shaft forgings caused by temperature fluctuations, improving the dimensional accuracy and microstructure uniformity of the forgings; second, through elastic buffer structures and differentiated pressure control, it avoids cracks on the surface and inside of the forgings, ensuring the mechanical properties of the forgings; third, the adaptive reset and linkage design of each component improves the continuity and stability of the process, reduces the frequency of repeated heating in traditional hot forging, and improves production efficiency.

[0051] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An isothermal hot forging device for large wind turbine main shaft forgings, comprising a hydraulic power cylinder (1), an upper pressure seat (2), a lower base (3), and a main support bracket (4), characterized in that, The lower base (3) is installed on the lower side of the main support bracket (4). The upper pressure seat (2) moves linearly along the vertical direction of the corresponding lower base (3) via a hydraulic power cylinder (1). The upper pressure seat (2) and the lower base (3) are respectively equipped with an upper arc block (10) and a lower arc block (9). The upper arc block (10) and the lower arc block (9) form a forging surface corresponding to the main shaft forging. The lower base (3) is provided with a pressure slide (7) and a cooperating arc support block (8) on both sides of the lower arc block (9). The upper pressure seat (2) is equipped with a wedge-shaped pressure block group (6) corresponding to the pressure slide (7), and the upper pressure seat (2) is equipped with a pneumatic hammer power assembly (12) corresponding to the upper arc block (10).

2. The isothermal hot forging device for large wind turbine main shaft forgings according to claim 1, characterized in that, The pressure-bearing slide (7) is slidably connected in the lower base (3) along the length direction of the vertical upper arc block (10), and a tension spring assembly is provided between the lower side of the pressure-bearing slide (7) and the lower base (3).

3. The isothermal hot forging device for large wind turbine main shaft forgings according to claim 2, characterized in that, The wedge-shaped pressure block group (6) is composed of multiple inclined wedge blocks. The inclined wedge blocks and the pressure-bearing slide (7) form an inclined wedge surface transmission mode. The cooperating arc-shaped support block (8) is located in the middle position between the pressure-bearing slide (7) and the lower arc block (9). The end position of the pressure-bearing slide (7) corresponding to the cooperating arc-shaped support block (8) is set as a curved surface contact position.

4. The isothermal hot forging device for large wind turbine main shaft forgings according to claim 1, characterized in that, Limiting blocks (11) are provided on both sides of the upper arc block (10). The cooperating arc support block (8), the limiting block (11) and the upper arc block (10) are equidistant or non-equidistant along the length direction of the main shaft forging.

5. The isothermal hot forging apparatus for large wind turbine main shaft forgings according to claim 4, characterized in that, A clearance space is provided between the cooperating arc-shaped support block (8) and the lower arc block (9), the upper arc block (10) and the limiting block (11) on the side that are close to each other, and multiple cooperating arc-shaped support blocks (8) are rotated in the lower base (3) along the length direction of the main shaft forging.

6. The isothermal hot forging apparatus for large wind turbine main shaft forgings according to claim 5, characterized in that, Each of the upper arc blocks (10) is provided with a ball joint (13) at the center point of the upper surface of the air hammer power assembly (12).

7. The isothermal hot forging apparatus for large wind turbine main shaft forgings according to claim 6, characterized in that, Inside the upper arc block (10), arc-shaped spring strips (14) are symmetrically distributed along the length direction of the main shaft forging with the ball joint (13) as the base point. The two ends of the arc-shaped spring strips (14) extend into the limiting block (11) and maintain a fixed connection with the limiting block (11).

8. The isothermal hot forging apparatus for large wind turbine main shaft forgings according to claim 1, characterized in that, The main support bracket (4) is equipped with a rotary power assembly (5) on one side of the outer wall corresponding to the length direction of the main shaft forging.

9. An isothermal hot forging process for large wind turbine main shaft forgings, using the isothermal hot forging apparatus for large wind turbine main shaft forgings as described in any one of claims 1 to 8, characterized in that, After the spindle forging is heated to the process temperature, it is placed on the lower arc block (9) in the lower base (3), and one end of the spindle forging is connected to the rotary power assembly (5). The following actions are performed by the hydraulic power cylinder (1): Action 1: The wedge-shaped pressure block group (6) contacts the pressure slide (7) before the upper arc block (10) contacts the spindle forging, causing the pressure slide (7) to slide towards the spindle forging at the same time, and causing the cooperating arc support block (8) to deflect in the direction close to the spindle forging; Action 2: The upper pressure seat (2) continues to move down through the hydraulic power cylinder (1), and multiple upper arc blocks (10) complete the pressure on the spindle forging. The blowing action of the main shaft forging, and the pressure slide (7) continues to move closer to the main shaft forging, providing lateral pressure to the side curved surface of the main shaft forging; Action 3: At the same time as Action 2 is completed, the pneumatic hammer power assembly (12) provides different pressures to multiple upper arc blocks (10), and on the basis of the upper pressure seat (2) remaining relatively stationary, the upper arc blocks (10) perform multi-point secondary hammering on the main shaft forging; Action 4: After completing Action 3, the upper pressure seat (2) resets upward, and the rotation power assembly (5) drives the main shaft forging to deflect at a fixed angle, and continues to repeat Action 1 to Action 3 above.

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