Die forging manufacturing method for ultra-large A286 gas turbine disc
Through the die forging process of intermediate blanks with specific sizes and high tonnage die forging machines, the tissue uniformity and cost problems of super-large A286 gas turbine discs are solved, and efficient preparation is achieved.
Patent Information
- Application Number
- CN202510729088.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-03
- Publication Date
- 2025-08-01
AI Technical Summary
The prior art cannot effectively prepare super-large A286 gas turbine discs with good tissue uniformity and low cost, especially due to equipment tonnage limitations, which cannot be molded.
The preparation and forging process of intermediate blanks of specific sizes are adopted, combined with a high-tonnage forging machine for molding, including upsetting, ring rolling and forging treatment, and the die forging parameters are optimized to achieve near-net molding.
It improves material utilization, reduces forging and pressing, reduces production costs, and obtains forgings with good tissue uniformity, improving mechanical properties.
Smart Images
Figure CN120394742A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of forging manufacturing, and in particular to a die forging manufacturing method for an ultra-large A286 gas turbine disc. Background Art
[0002] A286 is widely used in gas turbines, especially for key disc parts. Due to its complex working conditions, high requirements are placed on the overall uniformity of the forging's structure. However, due to the large size of the product, especially the large projected area of super-large disc parts (diameter φ1500 level), the heating temperature is low, and the deformation resistance is large, free forging can only be used at this stage. However, the utilization rate of free forging raw materials is low, and the number of forgings is large. The forming forging number of fires is more than 15 on a 6300T high-speed forging machine, which results in high production costs and a forming cycle of more than 7 days. At the same time, the streamlines of the forgings are uneven, and the forging streamlines of the disc parts are easily cut off after machining, affecting the performance of the product. The forging structure is poorly uniform and forging dead zones are prone to occur, resulting in poor uniformity of product performance, especially impact and durability. However, if die forging is used, the die forging pressure is greater than 120,000T. The current die pressing equipment cannot achieve such a large tonnage, so die forging cannot be used.
[0003] How to prepare ultra-large A286 gas turbine disks with good structural uniformity and low production cost is an urgent problem to be solved in this field. Summary of the Invention
[0004] To address the shortcomings of existing technologies, the present invention provides a die-forging method for ultra-large A286 gas turbine discs. By first preparing an intermediate blank of a specific size, followed by die pressing, and by defining the die pressing parameters, the present invention successfully achieves the production of ultra-large A286 gas turbine discs through die pressing. The resulting product not only exhibits excellent structural uniformity, but also reduces the number of burns, material loss, and production costs through die forging, offering a new approach and direction for the production of large forgings.
[0005] The technical solutions of the present invention are as follows:
[0006] The present invention provides a die forging manufacturing method for an ultra-large A286 gas turbine disc, the die forging manufacturing method comprising the following steps:
[0007] S1, smelting raw materials for ultra-large A286 gas turbine disks to obtain ingots;
[0008] S2: The ingot is heated, upset and stretched, and then air-cooled to room temperature to obtain a forged rod;
[0009] S3: heating the forged rod obtained in step S2, keeping the temperature, and then upsetting, punching, and ring rolling to obtain an intermediate billet;
[0010] S4: Place the intermediate blank in a die forging machine for die forging, and then perform heat treatment to obtain an extra-large A286 gas turbine disk.
[0011] Preferably, in step S1, the raw materials, by mass percentage, include the following components:
[0012] C: ≤0.08%; Si ≤0.30%; Mn ≤0.25%; P ≤0.25%; S: ≤0.25%; Ni: 24.00 - 27.00%; Mo: 1.00 - 1.50%; Cr: 13.50 - 16.00%; Al: ≤0.35%; Cu ≤0.50%; Ti: 1.90 - 2.35%; V: 0.10 - 0.50%; Co: ≤1.00%; B: 0.003 - 0.010%, and the balance is Fe and unavoidable impurities.
[0013] Preferably, in step S2, the ingot heating is to heat the ingot to 1120 ± 10 °C.
[0014] Preferably, in step S2, the upsetting and drawing out is at least three-upsetting and three-drawing out.
[0015] Preferably, for the three-upsetting and three-drawing out, the deformation amount of each upsetting and drawing out is 30 - 40%, and the single-pass reduction amount of drawing out is 60 - 80 mm.
[0016] Preferably, in step S3, the heating means heating to 1000 - 1040 °C; the holding time is the effective wall thickness of the forging rod * 0.6 - 0.8 min / mm.
[0017] Preferably, the process of upsetting and punching includes: on a hydraulic press with ≥5000T or other forging equipment such as a hydraulic press with equivalent pressure and a quick forging machine, upset the forging rod to 360 - 370 mm, then punch a hole and hold for heat preservation;
[0018] The diameter of the punched hole is 320 mm;
[0019] The holding time is 2 h + the effective wall thickness of the forging after punching * 0.6 min / mm.
[0020] Preferably, in step S3, the process of ring rolling includes: heat the workpiece obtained by upsetting and punching to 1000 - 1040 °C, hold for heat preservation, and then perform ring rolling on a ring rolling machine to obtain an intermediate blank;
[0021] The inner diameter of the intermediate blank is 1006 ± 5 mm, the outer diameter is 1316 ± 5 mm, and the height is 350 ± 5 mm;
[0022] The holding time is the effective wall thickness of the forging * (0.6 - 0.8) min / mm.
[0023] Preferably, in step S4, the process of die forging includes: first heating the intermediate blank to 990 - 1010 °C and holding for 0.6 - 0.8 min / mm, then placing the die that has been preheated to 250 - 450 °C on the operating platform of the die forging machine, placing the intermediate blank in the positioned die cavity, and then performing primary die forging forming at a speed of 7 - 10 mm / s to obtain the disc part; the heat treatment is to hold the workpiece after die forging at 970 - 990 °C for 2 h + effective thickness of the workpiece * (0.6 - 0.8) min / mm, water-cool it to 200 - 250 °C, and then air-cool or air-cool it to room temperature.
[0024] Preferably, in step S4, the die forging machine is a hydraulic die forging machine with a tonnage ≥ 60000T;
[0025] The starting forging temperature of the die forging is 940 - 1000 °C, and the finishing forging temperature ≥ 900 °C;
[0026] In the die forging, the equivalent strain of each region of the intermediate blank is 0.2 - 0.8, and the deformation amount is 20 - 55%.
[0027] The beneficial technical effects of the present invention are as follows:
[0028] The present invention realizes near-net forming of super-large disc parts through die forging, greatly reducing the blanking weight compared with open die forging, improving the material utilization rate, reducing the number of forging heats at the same time, and saving production costs; at the same time, by first preparing the intermediate ring blank and then performing die forging, the requirement for the tonnage of the equipment for die forging of large disc parts is reduced, solving the problem that the existing equipment cannot meet the tonnage requirements for die forging of large disc parts; in addition, the forging streamline of the die forging method of the present invention can be basically continuous during the processing process and is close to the finished product, the structure of the obtained forging is uniform, improving the mechanical properties of the product and the first-pass qualification rate of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 It is the metallographic structure of the forging in Embodiment 1 of the present invention.
[0030] Figure 2 It is the metallographic structure of the forging in Comparative Example 1 of the present invention.
[0031] Figure 3 It is a schematic diagram of the forging obtained by one embodiment of the present invention.
[0032] Figure 4 It is a schematic diagram of the prefabricated ring blank in one embodiment of the present invention.
[0033] Figure 5 It is a schematic diagram of the finishing die cavity in one embodiment of the present invention.
[0034] Figure 6Schematic diagram of the contact situation of the die forging die cavity in Embodiment 1 of the present invention.
[0035] Figure 7 Schematic diagram of the simulated temperature change of the forging after the die pressing deformation of the forging in Embodiment 1 of the present invention.
[0036] Figure 8 Schematic diagram of the equivalent strain of the die forging after die forging of the forging in Embodiment 1 of the present invention.
[0037] Figure 9 Schematic diagram of the metal streamline of the forging after die forging in Embodiment 1 of the present invention. Detailed implementation manners
[0038] The present invention will be specifically described below in conjunction with embodiments.
[0039] The present invention provides a die forging manufacturing method for an extra-large A286 gas turbine disk part ( Figure 3 The schematic diagram of one of the embodiments is given, and the dimensions in the figure are only for illustration and cannot be regarded as a limitation to this application.). The die forging manufacturing method includes the following steps:
[0040] S1. Smelt the raw materials used for the extra-large A286 gas turbine disk part to obtain an ingot;
[0041] S2: Heat the ingot, perform upsetting and drawing, and then air-cool to room temperature to obtain a forging bar;
[0042] S3: After heating the forging bar obtained in step S2, keep it warm, and then perform upsetting, punching, and ring rolling to obtain an intermediate blank ( Figure 4 The schematic diagram of one of the embodiments is given, and the dimensions in the figure are only for illustration and cannot be regarded as a limitation to this application.).
[0043] S4: Place the intermediate blank on a die forging machine for die forging ( Figure 5 The schematic diagram of one of the embodiments is given, and the dimensions in the figure are only for illustration and cannot be regarded as a limitation to this application), and perform heat treatment to obtain an extra-large A286 gas turbine disk part.
[0044] In some implementation manners, in step S1, the raw materials, by mass percentage, include the following components:
[0045] C: ≤0.08%; Si ≤0.30%; Mn ≤0.25%; P ≤0.25%; S: ≤0.25%; Ni: 24.00 - 27.00%; Mo: 1.00 - 1.50%; Cr: 13.50 - 16.00%; Al: ≤0.35%; Cu ≤0.50%; Ti: 1.90 - 2.35%; V: 0.10 - 0.50%; Co: ≤1.00%; B: 0.003 - 0.010%, the balance being Fe and unavoidable impurities.
[0046] In some embodiments, in step S1, the smelting method includes: IM + LF + VD + VAR, specifically: the raw materials are smelted in accordance with IM (induction melting) + LF (refining) + VD (vacuum degassing) + VAR (vacuum consumable electrode melting). The preferred specification of the ingot is φ630mm.
[0047] In some embodiments, 1650 kg of ingot blank is cut, and the two end faces are chamfered with R20, and then the ingot heating in step S2 is carried out.
[0048] In some embodiments, in step S2, the ingot heating is to heat the ingot to 1120 ± 10 °C.
[0049] In some embodiments, in step S2, the upsetting and drawing out is carried out by three upsetting and three drawing out.
[0050] In some embodiments, the deformation amount of each upsetting and drawing out in the three upsetting and three drawing out is 30 - 40%, and the single pass reduction amount of drawing out is 60 - 80 mm.
[0051] In some embodiments, in step S2, the forged bar is a forged bar with a diameter of 500 - 550 mm.
[0052] In some embodiments, in step S3, the heating means heating to 1000 - 1040 °C; the holding time is 0.6 - 0.8 min / mm of the effective wall thickness of the forged bar. The effective wall thickness, for a bar, is its diameter.
[0053] In some embodiments, the process of upsetting and punching includes: on a hydraulic press of ≥5000T, the forged bar is upset to a height of 360 - 370 mm, and then punched and held.
[0054] The diameter of the punched hole is 320 mm;
[0055] The holding time is 2 h + 0.6 min / mm of the effective wall thickness of the forging after punching.
[0056] In some embodiments, in step S3, the ring rolling is to preform the punched forging on a ring rolling machine; it can be understood that, compared with ring rolling, the size deviation of the horse-frame reaming is large, and the quality deviation of each part is large. During die forging, it may cause too much local material flow and too high temperature rise, resulting in coarse local grain size and unqualified performance.
[0057] In some embodiments, the process of the ring rolling specifically includes: heating the workpiece obtained by upsetting and punching to 1000 - 1040 °C, holding for heat preservation, and then performing ring rolling on a ring rolling machine with a diameter of 9000 mm to obtain an intermediate blank;
[0058] The inner diameter of the intermediate blank is 1006 ± 5 mm, the outer diameter is 1316 ± 5 mm, and the height is 350 ± 5 mm;
[0059] The heat preservation time is the effective wall thickness of the forging * (0.6 - 0.8) min / mm. In the present invention, for a rectangular cross-section, the effective wall thickness can generally be calculated according to the minimum thickness of the largest cross-section.
[0060] In some embodiments, in step S4, the process of the die forging includes: placing the intermediate blank in a die forging machine, first heating to 990 - 1010 °C, holding for heat preservation for 0.6 - 0.8 min / mm, and then performing one-time die forging forming at a speed of 7 - 10 mm / s to obtain the disc part;
[0061] The homogenization is to hold the workpiece after die forging at 970 - 990 °C for 2 h + the effective wall thickness of the workpiece * (0.6 - 0.8) min / mm, and air-cool to room temperature.
[0062] In some embodiments, in step S4, the die forging machine is a hydraulic die forging machine with a tonnage ≥ 60000 T;
[0063] The starting forging temperature of the die forging is 940 - 960 °C, and the final forging temperature ≥ 900 °C;
[0064] In the die forging, the equivalent strain of each region of the intermediate blank is 0.2 - 0.8, and the deformation amount is 20 - 55%.
[0065] It can be understood that through the design of the intermediate blank of a ring part with specific dimensions and the combination of ring rolling and die forging processes, the original forging pressure of 100000 T level is reduced to 60000 T, realizing the feasibility of overall die forging; at the same time, the original free forging feeding of 2.6 T is reduced to 1650 kg, saving about 950 kg of materials per piece, and the material saving ratio is 38%, greatly reducing the raw material cost; in addition, the original number of forging heats of 15 for free forging is reduced to 5 for the existing process, greatly reducing the production and manufacturing cost; through the overall die forging method, a metal streamline close to the product and a metal structure with uniform 3 - 4 grade grain size are obtained, improving the mechanical properties of the product.
[0066] The present invention will be further described below by way of examples.
[0067] Example 1
[0068] A gas turbine disk with a diameter of φ1500mm level, the net weight of the forging is 980kg, and its preparation method is as follows:
[0069] S1: Smelt the raw materials used for the above gas turbine disk parts to obtain an ingot; the specification of the ingot is φ630mm.
[0070] Among them, the raw materials, by mass percentage, include: C: 0.07%; Si: 0.17%; Mn: 0.097%; P: 0.012%; S: 0.002%; Ni: 24.87%; Cr: 14.42%; V: 0.30%; Mo: 1.24%; Al: 0.22%; Ti: 2.25%; B: 0.005%; Cu: 0.02%; Co: 0.03%; the balance is Fe.
[0071] The smelting method is: IM + LF + VD + VAR, specifically: the raw materials are in accordance with IM (induction melting) + LF (refining) + VD (vacuum degassing) + VAR (vacuum consumable).
[0072] S2: Cut 1650kg of the ingot, chamfer the two end faces with R20, then heat the ingot to 1120°C, and then perform three upsetting and three drawing operations. The deformation amount of each upsetting and drawing operation is 35%, and the reduction per pass of drawing is 70mm, and then air-cool to room temperature to obtain a forging bar with a diameter of 500mm.
[0073] S3: Upset, punch holes and ring-roll the forging bar to obtain an intermediate blank; the structure is as Figure 4 shown.
[0074] The specific process of upsetting and punching holes is: heat the forging bar in step S2 to 1020°C, keep it warm, and the holding time is the effective wall thickness of the forging * 0.7min / mm. Then, on a 5000T hydraulic press, upset the workpiece to a height of 360mm, punch a φ320mm inner hole, and keep it warm. The holding time is calculated as 2h + the effective wall thickness of the forging * 0.6min / mm.
[0075] The specific process of ring-rolling is: heat the workpiece obtained by upsetting and punching holes to 1020°C, keep it warm, and the holding time is the effective wall thickness of the workpiece * 0.7min / mm. Then roll it on a φ9000mm ring rolling mill to obtain an intermediate blank; the dimensions of the intermediate blank are: 1316 * 1006 * 350 (outer diameter * inner diameter * height, the units are all mm).
[0076] S4: Place the intermediate blank in a die forging machine for die forging and heat treatment to obtain an extra-large A286 gas turbine disk.
[0077] The specific process of die forging is as follows: Place the intermediate blank in a 60,000T hydraulic die forging machine for die forging. First, heat it to 1000 °C and hold the temperature. The holding time is the effective wall thickness of the intermediate blank * 0.7 min / mm. Then, at a pressing speed of 8 mm / s, forge the intermediate blank into a disk product in one step.
[0078] Among them, the final forging temperature is 900 °C; during die forging, the equivalent strain in each area of the intermediate blank is 0.5, and the deformation amount is 35%.
[0079] Heat treatment is to hold the die-forged workpiece at 980 °C for 2 h + the effective thickness of the workpiece * 0.7 min / mm, water-cool it to 225 °C, and air-cool it to room temperature.
[0080] Example 2
[0081] A gas turbine disk with a diameter of φ1500 mm level, the net weight of the forging is 980 kg, and its preparation method is as follows:
[0082] S1: Smelt the raw materials used for the above gas turbine disk to obtain an ingot; the specification of the ingot is φ630 mm.
[0083] Among them, the raw materials, by mass percentage, include: C: 0.055%; Si: 0.13%; Mn: 0.081%; P: 0.012%; S: 0.002%; Ni: 24.85%; Cr: 14.48%; V: 0.30%; Mo: 1.23%; Al: 0.22%; Ti: 2.18%; B: 0.005%; Cu: 0.015%; Co: 0.03%; the balance is Fe and indispensable impurities.
[0084] The smelting method is: IM + LF + VD + VAR, specifically: the raw materials are processed according to IM (induction melting) + LF (refining) + VD (vacuum degassing) + VAR (vacuum consumable).
[0085] S2: Cut 1650 kg of the ingot, chamfer the two end faces with R20, then heat the ingot to 1120 °C, and then perform three upsetting and three drawing operations. The deformation amount of each single upsetting and drawing operation is 30%, and the single-pass reduction amount of drawing is 60 mm. Then air-cool it to room temperature to obtain a forged bar with a diameter of 500 mm.
[0086] S3: Upset and punch the forged bar and perform ring rolling to obtain an intermediate blank;
[0087] The specific process of upsetting and punching is as follows: heat the forging bar in step S2 to 1020 °C and hold the temperature. The holding time is the effective wall thickness of the forging * 0.6 min / mm. Then, on a 5000T hydraulic press, upset the workpiece to a height of 360 mm, punch a φ320 mm inner hole, and hold the temperature. The holding time is calculated as 2 h + the effective wall thickness of the forging * 0.6 min / mm.
[0088] The specific process of ring rolling is as follows: heat the workpiece obtained by upsetting and punching to 1020 °C and hold the temperature. The holding time is the effective wall thickness of the workpiece * 0.6 min / mm. Then, roll it on a φ9000 mm ring rolling mill to obtain an intermediate blank. The dimensions of the intermediate blank are: 1316 * 1006 * 350 (outer diameter * inner diameter * height, all in mm).
[0089] S4: Place the intermediate blank in a die forging machine for die forging and heat treatment to obtain an extra-large A286 gas turbine disk.
[0090] The specific process of die forging is as follows: place the intermediate blank in a 60000T hydraulic die forging machine for die forging. First, heat it to 1000 °C and hold the temperature. The holding time is the effective wall thickness of the intermediate blank * 0.6 min / mm. Then, use a pressing speed of 7 mm / s to forge the intermediate blank into a disk product in one step.
[0091] Among them, the final forging temperature of die forging is 900 °C; during die forging, the equivalent strain of each region of the intermediate blank is 0.2 and the deformation amount is 20%.
[0092] The heat treatment is to hold the workpiece after die forging at 970 °C for 2 h + the effective thickness of the workpiece * 0.6 min / mm, cool it to 200 °C with water, and then air-cool it to room temperature.
[0093] Example 3
[0094] A gas turbine disk with a diameter of φ1500 mm level, the net weight of the forging is 980 kg, and its manufacturing method is as follows:
[0095] S1: Smelt the raw materials used for the above gas turbine disk to obtain an ingot. The specification of the ingot is φ630 mm.
[0096] Among them, the raw materials, by mass percentage, include: C: 0.055%; Si: 0.12%; Mn: 0.10%; P: 0.012%; S: 0.001%; Ni: 25.15%; Cr: 14.48%; V: 0.33%; Mo: 1.28%; Al: 0.23%; Ti: 2.27%; B: <<MASK_B>>0.006%; Cu: 0.015%; Co: 0.03%; the balance is Fe and indispensable impurities.
[0097] The smelting method is: IM + LF + VD + VAR, specifically: the raw materials are processed according to IM (induction melting) + LF (refining) + VD (vacuum degassing) + VAR (vacuum consumable electrode melting).
[0098] S2: Cut a 1650 kg ingot, chamfer both ends with a radius of R20, then heat the ingot to 1120 °C, and then perform three upsetting and three drawing operations. The deformation amount for each upsetting and drawing operation is 40%, and the reduction per single pass for drawing is 80 mm. Then air cool to room temperature to obtain a forging bar with a diameter of 500 mm.
[0099] S3: Upset and punch the forging bar and then perform ring rolling to obtain an intermediate blank;
[0100] The specific process of upsetting and punching is as follows: Heat the forging bar obtained in step S2 to 1020 °C and hold for a time calculated as the effective wall thickness of the forging * 0.8 min / mm. Then, on a 5000T hydraulic press, upset the workpiece to a height of 360 mm, punch a φ320 mm inner hole, and hold for a time calculated as 2 h + the effective wall thickness of the forging * 0.6 min / mm.
[0101] The specific process of ring rolling is as follows: Heat the workpiece obtained by upsetting and punching to 1020 °C and hold for a time calculated as the effective wall thickness of the workpiece * 0.8 min / mm. Then roll on a φ9000 mm ring rolling mill to obtain an intermediate blank; the dimensions of the intermediate blank are: 1316 * 1006 * 350 (outer diameter * inner diameter * height, all in mm).
[0102] S4: Place the intermediate blank in a die forging machine for die forging and heat treatment to obtain an extra-large A286 gas turbine disk.
[0103] The specific process of die forging is as follows: Place the intermediate blank in a 60000T hydraulic die forging machine for die forging. First, heat it to 1000 °C and hold for a time calculated as the effective wall thickness of the intermediate blank * 0.8 min / mm. Then, at a pressing speed of 10 mm / s, forge the intermediate blank into a disk product in one step.
[0104] Among them, the final forging temperature for die forging is 900 °C; during die forging, the equivalent strain in each region of the intermediate blank is 0.8 and the deformation amount is 55%.
[0105] The heat treatment is to hold the workpiece after die forging at 990 °C for 2 h + the effective thickness of the workpiece * 0.8 min / mm, water cool to 250 °C, and then air cool or air cool to room temperature.
[0106] Comparative Example 1
[0107] A gas turbine disk with a diameter of φ1500 mm level, the net weight of the forging is 980 kg, and its preparation method is basically the same as that of Example 1, except that in step S4, the deformation amount in die forging is changed to 15%.
[0108] Test example:
[0109] The properties such as the grain size of the disk parts obtained in the examples and comparative examples were tested. The specific method was as follows: Three points of the grain size on each end face of the workpieces in the examples and comparative examples were inspected after forging. The results showed that the grain sizes in the examples were all at levels 3 - 4. Figure 1 It is the grain diagram of the forging of Example 1. Figure 2 It is the grain diagram of the forging of Comparative Example 1. As can be seen from the figure, the examples of the present invention can obtain a better grain distribution.
[0110] The present invention referred to the basic data of the materials in "China Superalloy Handbook" and used software simulation to investigate the situation in the die forging stage of Example 1. Figure 6 It is a schematic diagram of the simulation of the contact situation of the die cavity of the die forging of Example 1 of the present invention. Figure 6 In it, the blue and green lines represent the contact situation of the die cavity. As can be seen from the figure, the contact of the forging in the die is good. Figure 7 It is a schematic diagram of the simulation of the temperature change of the forging after the die pressing deformation of the forging of Example 1 of the present invention. In the figure, the gray color is the outline of the forging, and the red color represents high temperature. It can be seen that the gray line is basically in the red area, indicating that after the die pressing deformation, the temperature distribution of the forging is relatively uniform. Figure 8 It is a schematic diagram of the equivalent strain of the die forging of the forging of Example 1 of the present invention after die forging. As can be seen from the figure, the strain of each part of the die - pressed forging is between 0.2 - 0.75, and the strain is uniform, reducing stress concentration. Figure 9 It is a schematic diagram of the metal streamline of the forging of Example 1 of the present invention after die forging. It can be seen that the density of the streamline of the product obtained by die forging is uniform, indicating that the stress at different positions inside the workpiece is more uniform.
[0111] This method adopts an overall die - forging scheme, one - fire die forging, and the forging pressure is reduced to 59500T, far lower than the 100000T level; for the overall die forging of the present invention, the equivalent strain of each region of the workpiece is 0.2 - 0.75, the deformation is relatively uniform, and there is no dead zone of deformation; a uniform metallographic structure can be obtained.
[0112] The above - mentioned is only the preferred embodiment of the present invention, and the present invention is not limited to the above examples. It can be understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included within the protection scope of the present invention.
Claims
1. A forging manufacturing method for an extra-large A286 gas turbine disk, characterized in that The die forging manufacturing method includes the following steps: S1. Smelt the raw materials for the super-large A286 gas turbine disk to obtain an ingot; S2: Heat the ingot, perform upsetting and drawing, and then air-cool to room temperature to obtain a forging bar; S3: After heating the forging bar obtained in step S2, keep it warm, and then perform upsetting, punching, and ring rolling to obtain an intermediate blank; S4: Place the intermediate blank on a die forging machine for die forging forming, and then perform heat treatment to obtain the super-large A286 gas turbine disk.
2. The die forging manufacturing method according to claim 1, characterized in that, In step S1, the raw materials, by mass percentage, include the following components: C: ≤0.08%; Si ≤0.30%; Mn ≤0.25%; P ≤0.25%; S: ≤0.25%; Ni: 24.00 - 27.00%; Mo: 1.00 - 1.50%; Cr: 13.50 - 16.00%; Al: ≤0.35%; Cu ≤0.50%; Ti: 1.90 - 2.35%; V: 0.10 - 0.50%; Co: ≤1.00%; B: 0.003 - 0.010%, and the balance is Fe and unavoidable impurities.
3. The die forging manufacturing method according to claim 1, wherein In step S2, the heating of the ingot is to heat the ingot to 1120 ± 10°C.
4. The die forging manufacturing method according to claim 1, wherein In step S2, the upsetting and drawing is at least three-upsetting and three-drawing.
5. The die forging manufacturing method according to claim 4, characterized in that, For the three-upsetting and three-drawing, the deformation amount of each upsetting and drawing is 30 - 40%, and the single-pass reduction amount of drawing is 60 - 80 mm.
6. The die forging manufacturing method according to claim 1, characterized in that, In step S3, the heating means heating to 1000 - 1040°C; the holding time is 0.6 - 0.8 min / mm of the effective wall thickness of the forging bar.
7. The die forging manufacturing method according to claim 1, characterized in that, The process of upsetting and punching includes: on a hydraulic press with a tonnage of ≥5000T or other forging equipment such as a hydraulic press or a quick forging machine with equivalent pressure, upset the forging bar to 360 - 370 mm, then punch holes and keep it warm; The diameter of the punched hole is 320 mm; The holding time is 2h + 0.6 min / mm of the effective wall thickness of the forging after punching.
8. The die forging manufacturing method according to claim 1, characterized in that, In step S3, the process of ring rolling includes: heat the workpiece obtained by upsetting and punching to 1000 - 1040°C, keep it warm, and then perform ring rolling on a ring rolling machine to obtain an intermediate blank; The inner diameter of the intermediate blank is 1006 ± 5 mm, the outer diameter is 1316 ± 5 mm, and the height is 350 ± 5 mm; The holding time is (0.6 - 0.8) min / mm of the effective wall thickness of the forging.
9. The die forging manufacturing method according to claim 1, characterized in that, In step S4, the process of die forging includes: first heat to 990 - 1010°C, keep it warm for 0.6 - 0.8 min / mm, then place the die that has been preheated to 250 - 450°C on the operation platform of the die forging machine, place the intermediate blank in the positioned die cavity, and then perform one-time die forging forming at a speed of 7 - 10 mm / s to obtain the disk; The heat treatment is to keep the workpiece after die forging at 970 - 990°C for 2h + (0.6 - 0.8) min / mm of the effective thickness of the workpiece, water-cool to 200 - 250°C, and then air-cool or air-cool to room temperature.
10. The die forging manufacturing method according to claim 9, characterized in that, In step S4, the die forging machine is a hydraulic die forging machine with a tonnage of ≥60000T; The starting forging temperature of the die forging is 940 - 1000 °C, and the finishing forging temperature ≥ 900 °C; In the die forging, the equivalent strain of each area of the intermediate blank is 0.2 - 0.8, and the deformation amount is 20 - 55%.