Die forging forming method for 16Cr3NiWMoVNbE alloy gear shaft

By adopting the die forging forming method of 16Cr3NiWMoVNbE alloy in the production of gear shaft forging, the problems of cross-sectional difference and molding difficulty in traditional production methods are solved, and the effect of filling the mold silo and reducing production costs is achieved.

CN120228237APending Publication Date: 2025-07-01GUIZHOU ANDA AVIATION FORGING
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Patent Information

Application Number
CN202311839245.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-12-28
Publication Date
2025-07-01

AI Technical Summary

Technical Problem

The traditional gear shaft forging production methods have poor cross-sections, making it difficult to fill the mold bin without waste and fire forming requirements, resulting in high molding difficulty and high production costs.

Method used

The 16Cr3NiWMoVNbE alloy gear shaft die forging and forming method is adopted. By heating rod material and performing pier roughness, flattening and molding at high temperature, combining reasonable heating temperature and insulation time, the downward pressure of pier roughness and flattening is controlled, and the design of the reasonable position of the mold bin is expanded and expanded to ensure that the metal fills the cavity and reduces deformation resistance.

Benefits of technology

It realizes that the mold bin is filled with the requirements of unstained and fire-forming, which improves the molding effect and tissue uniformity of the forgings, reduces production costs, and improves the pass rate of the product.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a die forging forming method for a 16Cr3NiWMoVNbE alloy gear shaft, which aims at solving the technical problems of ensuring the forming effect of a forge piece, ensuring the qualification rate and saving the cost of the forge piece, and comprises the following forging steps: heating a die to 200-300 DEG C in advance, taking a 16Cr3NiWMoVNbE alloy bar with a certain specification, putting the 16Cr3NiWMoVNbE alloy bar into a heating furnace for heating at the heating temperature of 1140 DEG C, charging the 16Cr3NiWMoVNbE alloy bar into the furnace when the temperature is reached, and carrying out die forging; the charging requirement is that a layer is flatly charged in an effective area, and the bar is taken out after the heat preservation time is 60 minutes; and the bar is subjected to upsetting immediately after being discharged out of a furnace, then is flattened and then is immediately subjected to longitudinal side-standing discharging to enter a mold e for mold pressing, a die forging c is obtained after one-time heating is completed, the discharging transfer time is required to be smaller than or equal to 25 s, the temperature at the beginning of forging is required to be 1090-1140 DEG C, the temperature after forging is required to be larger than or equal to 900 DEG C, edge cutting is conducted while hot after mold pressing is completed, air cooling is conducted in a pile after edge cutting is conducted, and a finished product d is obtained. The method is mainly used for forging the 16Cr3NiWMoVNbE alloy gear shaft.
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Description

Technical Field

[0001] The present invention relates to a forging method of 16Cr3NiWMoVNbE alloy, and particularly to a die forging forming method of 16Cr3NiWMoVNbE alloy gear shaft. Background Art

[0002] Gear shafts are widely used. There is a large cross-section difference in the production method of traditional gear shaft forgings. When formulating the process, if small-sized materials are selected, it is difficult to fill the large cross-section area; if large-sized materials are selected, there will be excessive flash at the small cross-section area, and most of the flash bin will be filled, resulting in excessive deformation resistance, making it more difficult for the vertical dimensions to change, and the large cross-section area still cannot be filled and it is difficult to be fully seated. The material of this product is 16Cr3NiWMoVNbE. To ensure the grain size requirements, this material requires no roughing and one-fire forming, which is very difficult to form and has high requirements for forging costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a die forging forming method of 16Cr3NiWMoVNbE alloy gear shaft, which can fill the die cavity under the requirements of no roughing and one-fire forming, meet the process requirements, and save the production cost of forgings.

[0004] To solve the above technical problems, the technical solutions involved in the present invention include the following steps:

[0005] Take a 16Cr3NiWMoVNbE alloy bar a of a certain specification and put it into a heating furnace for heating. The heating temperature is 1140°C. When reaching the temperature, load it into the furnace. The loading requirement is to lay it flat in one layer within the effective area. After holding for 60 minutes, take it out to obtain bar b.

[0006] Immediately upset the bar after it is taken out of the furnace, then flatten it and immediately place it vertically and laterally into die e for die forging. Complete it in one fire. After taking it out, obtain die forging c. Cut the edge of die forging c while it is hot and then air-cool it to obtain finished product d.

[0007] Die e mainly consists of upper die e1 and lower die e2. The upper die e1 and the lower die e2 are symmetrical. The lower die e2 is square as a whole. The die is provided with a jaw e25. The center above the lower die is a cavity e21. The cavity e21 deforms the metal as required to obtain the required shape. Around the cavity e21 is a flash groove e22. The protruding part is the flash groove bridge e23. The function of the bridge e23 is to prevent the metal from flowing out, forcing the metal to fill the cavity e21, and enabling the excess metal to flow out through the bridge e23. The flowing metal flows into the bin e24 of the flash groove through the flash groove bridge. The present invention enlarges and deepens the positions of the upper and lower die cavities by the way of the falling die cavity e24.

[0008] Particularly, for the die forging forming method of the 16Cr3NiWMoVNbE alloy gear shaft of the present invention, before die forging the bar stock b, the die needs to be preheated to 200°C - 300°C.

[0009] Particularly, for the die forging forming method of the 16Cr3NiWMoVNbE alloy gear shaft of the present invention, the requirement for the transfer time of the forging out of the furnace is ≤25 s, the starting temperature for forging is required to be 1090°C - 1140°C, and the temperature after forging is ≥900°C.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0011] For the die forging forming method of the 16Cr3NiWMoVNbE alloy gear shaft of the present invention, a process route of upsetting and flattening followed immediately by die forging and then trimming is adopted. By designing reasonable heating temperature and holding time, the uniformity of the internal temperature of the bar stock is ensured; by controlling reasonable upsetting and flattening reduction amounts, the forming effect of the forging is ensured; by enlarging and deepening the cavity positions of the upper and lower dies, the deformation resistance caused by the filling of the flash cavity is reduced, so that the vertical dimension of the forging continues to decrease, and metal material continues to flow into the largest cross-section of the forging, enabling the forging to be filled, which greatly improves the forming effect. The final product has good tissue uniformity, good forming effect, high qualification rate, and saves the cost of forgings. Description of the Drawings

[0012] Figure 1 It is the forging forming process diagram of the present invention.

[0013] Figure 2 It is the die diagram of the present invention.

[0014] Figure 3 It is the die assembly diagram and the schematic diagram of the die forging process of the present invention.

[0015] Figure 4 It is the finished product diagram of the present invention. Detailed Embodiments

[0016] As Figure 1 shown, to implement the die forging forming method of the 16Cr3NiWMoVNbE alloy gear shaft of the present invention, equipment such as a heating furnace, a press, a manipulator, and a trimming machine need to be provided. Figure 1 The specific implementation manners of the shown process include the following steps:

[0017] (1) Heating: Take a 16Cr3NiWMoVNbE alloy bar stock a of a certain specification and put it into the heating furnace for heating. The heating temperature is 1140°C. When reaching the temperature, load it into the furnace. The loading requirement is to lay it flat in one layer within the effective area. After holding for 60 minutes, take it out to obtain the bar stock b; at the same time, preheat the die to 200°C - 300°C.

[0018] (2) Forming: After the bar stock is taken out of the furnace, it is immediately upset, then flattened and immediately placed vertically on its side and fed into die e for die forging. It is completed in one heat. After taking out, the die forging c is obtained. The requirement for the transfer time after taking out of the furnace is ≤25 s. The temperature at the start of forging is required to be 1090°C - 1140°C, and the temperature after forging is ≥900°C.

[0019] (3) Hot trimming: After die forging is completed, trimming is carried out while it is hot. After trimming, it is air-cooled in a pile to obtain the finished product d.

[0020] As Figure 2 and Figure 3 shown, when implementing the die forging forming method of the 16Cr3NiWMoVNbE alloy gear shaft of the present invention, die e is mainly composed of an upper die e1 and a lower die e2. The upper die e1 and the lower die e2 are symmetrical. The lower die e2 is square as a whole. The die is provided with a jaw e25. In the center above the lower die is a cavity e21. The cavity e21 deforms the metal as required to obtain the required shape. Around the cavity e21 is a flash groove e22. The protruding part is the flash groove bridge part e23. The function of the bridge part e23 is to prevent the metal from flowing out, forcing the metal to fill the cavity e21, and enabling the excess metal to flow out through the bridge part e23. The flowing metal flows into the pocket part e24 of the flash groove through the flash groove bridge part. The present invention expands and deepens the positions of the pockets of the upper and lower dies by dropping the pocket part e24 of the die. By dropping the pocket part of the die, the metal material gradually moves towards the pocket during die forging, reducing the deformation resistance due to the filling of the flash pocket. The vertical dimension continues to become smaller, and the metal material continues to flow into the largest part of the product interface. The forging is filled, and the vertical dimension can also be close to the requirements of the drawing.

Claims

1. A die forging forming method for a 16Cr3NiWMoVNbE alloy gear shaft, characterized in that, It includes the following steps: Take a 16Cr3NiWMoVNbE alloy bar a of a certain specification and put it into a heating furnace for heating. The heating temperature is 1140°C. When the temperature reaches the required value, load it into the furnace. The loading requirement is to lay it flat in one layer within the effective area. After holding for 60 minutes, take it out to obtain bar b; Immediately upset the bar after it is taken out of the furnace, then flatten it, and immediately place it vertically and laterally into die e for die forging. Complete it in one heat. After taking it out, obtain the die forging c. Cut the edge of the die forging c while it is hot and then air-cool it to obtain the finished product d; Die e mainly consists of an upper die e1 and a lower die e2. The upper die e1 and the lower die e2 are symmetrical. The lower die e2 is square as a whole. The die is provided with a jaw e25. The center above the lower die is a cavity e21. The cavity e21 deforms the metal according to requirements to obtain the required shape. Around the cavity e21 is a flash groove e22. The protruding part is the flash groove bridge part e23. The function of the bridge part e23 is to prevent the metal from flowing out, force the metal to fill the cavity e21, and enable the excess metal to flow out through the bridge part e23. The flowing metal flows into the storage part e24 of the flash groove through the flash groove bridge part. In the present invention, by the way of the falling die storage part e24, the positions of the upper and lower die storage parts are enlarged and deepened.

2. The precision forging forming method of the 16Cr3NiWMoVNbE alloy gear shaft according to claim 1, characterized in that, Before die forging the bar b, the die needs to be preheated to 200°C - 300°C in advance.

3. The die forging forming method of the 16Cr3NiWMoVNbE alloy gear shaft according to claim 1, wherein The requirement for the transfer time of the forging out of the furnace is ≤25s. The temperature at the start of forging is required to be 1090°C - 1140°C, and the temperature after forging is ≥900°C.