Method for forming irregular sheet forgings
By forging and lubrication of molds in steps, the problem of difficult forming of irregular thin plate forgings is solved, and the forming quality of forgings is improved, especially the local filling and stability of cross-sectional adaptation.
Patent Information
- Application Number
- CN202311839777.2
- 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
It is difficult to form irregular thin plate forgings, especially during the preforming process, there are defects such as partial filling of forgings and easy folding at cross-sectional adapters, which is difficult to meet the design requirements under high stress conditions.
The process of step-by-step forging is adopted, including upsetting, length extraction, material separation, and shaping. Combined with molybdenum disulfide and engine oil lubricated molds, three-fire forging is used to control pressure and speed, and gradually form irregular thin plate forgings.
The forming quality of irregular thin plate forgings has been improved, the local filling and folding problems of forgings have been solved, and high-quality forging forming has been achieved.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention relates to a complex forming method, in particular to a forming method for irregular thin plate forgings. Background Art
[0002] Irregular thin plate forgings have the characteristics of complex internal structure, large variation in cross-sectional dimensions, thin overall thickness dimension, large and irregular external dimensions, etc. The blanks are usually formed by casting, but for some parts with high requirements for stress conditions, the design requires forging. The forming of such structural forgings is difficult, especially with high requirements for the shape and quality of the preformed blank. If it does not match the dimensions of the final formed forging, there are defects such as incomplete filling of local parts of the forging and easy occurrence of folding at the transitions of each cross-section. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to provide a forming method for irregular thin plate forgings to improve the forming quality of irregular thin plate forgings.
[0004] To solve the above technical problem, the forming method for irregular thin plate forgings of the present invention includes the following steps:
[0005] Take a bar of a certain specification, load it into an electric furnace and heat it to 30°C below the phase transformation point, and keep it warm for 270 min;
[0006] Take out the bar after heat preservation, upset it on a free forging hammer and then draw it out; keep the left end of the blank unchanged, divide the material and draw it out at a distance a from the left end of the blank, and then upset the whole blank flat; then draw out and shape the left end of the blank to make an intermediate blank;
[0007] Heat the intermediate blank back to the furnace at 1080°C; heat the die to 880°C - 900°C; lubricate the upper and lower cavities of the die with molybdenum disulfide + machine oil; place the heated intermediate blank in the lower die of an isothermal press for forging; the forging process is carried out in three heats;
[0008] First heat forging: Press the upper die down for the first time at a rate of 0.2 mm / s, with an underpressure of 20 mm and a holding pressure time of 60 s; then raise the upper die and press it down for the second time at a rate of 0.1 mm / s, with an underpressure of 18 mm and a holding pressure time of 60 s; then raise the upper die again and press it down for the third time at a rate of 0.08 mm / s, with an underpressure of 15 mm and a holding pressure time of 60 s;
[0009] Second heat forging: Press the upper die down at a rate of 0.08 mm / s, with an underpressure of 5 mm - 6 mm and a holding pressure time of 60 s;
[0010] Third fire forging: Press down the upper die at a rate of 0.08 mm / s to press the forging to its final size, and hold the pressure for 120 s.
[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0012] The forming method of the irregular thin plate forging of the present invention can effectively realize the forging forming of the irregular thin plate forging and improve the forming quality of the titanium alloy irregular thin plate forging. Description of the drawings
[0013] The present invention will be further described in detail below with reference to the drawings and specific embodiments.
[0014] Figure 1 It is a schematic diagram of the blank dividing structure.
[0015] Figure 2 It is a schematic diagram of the intermediate blank structure. Specific embodiments
[0016] Implementing the forming method of the irregular thin plate forging of the present invention requires providing equipment such as a forging heating furnace, an isothermal press, and a manipulator. Taking the titanium alloy irregular thin plate forging with the material number TC4 in China as an example, the specific implementation of this method will be described in detail below:
[0017] The main chemical element contents (weight percentages) of this alloy are as follows: the Al content is 5.5% - 6.8%, the V content is 3.5% - 4.5%, the Fe content is ≤ 0.30%, the C content is ≤ 0.10%, the N content is ≤ 0.05%, the H content is ≤ 0.015%, the O content is ≤ 0.20%, the content of other elements is ≤ 0.10% for each single element and ≤ 0.40% in total, and the balance is Ti.
[0018] The steps of this method are as follows:
[0019] Take a TC4 bar of a certain specification, load it into an electric furnace and heat it to 30°C below the phase transformation point, and hold the temperature for 270 min;
[0020] Take out the bar after heat preservation, perform upsetting on a free forging hammer, and then draw it out; keep the left end of the blank unchanged, divide the material and draw it out at a distance of a from the left end of the blank, and then upset the whole blank flat, as shown in 1; then draw out and shape the left end of the blank to make an intermediate blank, as shown in 2;
[0021] Heat the intermediate blank back to the furnace to 30°C below the phase transformation point; heat the die to 880°C - 900°C; lubricate the upper and lower cavities of the die with molybdenum disulfide + machine oil; place the heated intermediate blank in the lower die of the isothermal press for forging; the forging process is carried out in three fires;
[0022] First fire forging: Lower the upper die for the first time at a rate of 0.2 mm / s, with an underpressure of 20 mm and a holding pressure time of 60 s; then raise the upper die and lower it for the second time at a rate of 0.1 mm / s, with an underpressure of 18 mm and a holding pressure time of 60 s; then raise the upper die again and lower it for the third time at a rate of 0.08 mm / s, with an underpressure of 15 mm and a holding pressure time of 60 s; the production process parameters are shown in the following table:
[0023]
[0024] Second fire forging: Lower the upper die at a rate of 0.08 mm / s, with an underpressure of 5 mm - 6 mm and a holding pressure time of 60 s; the production process parameters are shown in the following table:
[0025] Pressure (T) Displacement (mm) Underpressure from the final forging forming (mm) 5000 +80 5～6
[0026] Third fire forging: Lower the upper die at a rate of 0.08 mm / s to press the forging to the final size, with a holding pressure time of 120 s, and the production process parameters are shown in the following table:
[0027] Pressure (T) Displacement (mm) Underpressure from the final forging forming (mm) 7250 +50 0
Claims
1. A forming method for irregular thin plate-like forgings, characterized in that, It includes the following steps: Take bar materials of a certain specification, load them into an electric furnace, heat them to 30°C below the phase transformation point, and hold the temperature for 270 min; Take out the bar materials after heat preservation, upset them on a free forging hammer, and then draw them out; keep the left end of the blank unchanged, divide the material and draw out the part at a distance of a from the left end of the blank, and then upset the whole blank; then draw out and shape the left end of the blank to make an intermediate blank; Heat the intermediate blank in the furnace to 1080°C; heat the die to 880°C - 900°C; lubricate the upper and lower cavities of the die with molybdenum disulfide + machine oil; place the heated intermediate blank in the lower die of an isothermal press for forging; the forging process is carried out in three heats; The first heat forging: lower the upper die for the first time at a rate of 0.2 mm / s, with an underpressure of 20 mm and a pressure holding time of 60 s; then raise the upper die, lower it for the second time at a rate of 0.1 mm / s, with an underpressure of 18 mm and a pressure holding time of 60 s; then raise the upper die again, lower it for the third time at a rate of 0.08 mm / s, with an underpressure of 15 mm and a pressure holding time of 60 s; The second heat forging: lower the upper die at a rate of 0.08 mm / s, with an underpressure of 5 mm - 6 mm and a pressure holding time of 60 s; The third heat forging: lower the upper die at a rate of 0.08 mm / s to press the forging to the final size, with a pressure holding time of 120 s.