Forming method of super large titanium alloy blisk forging
Patent Information
- Application Number
- CN202611399850.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-10
- Publication Date
- 2026-10-20
AI Technical Summary
在同一加载行程下，整体模具的型腔是刚性耦合的，难以分区协同这种大差异的变形需求，往往顾此失彼
通过分体式模具结构配合三阶段时序加载策略，将整体成型力分解至不同阶段和不同模具单元，显著降低了各阶段所需峰值载荷，突破了设备能力限制；
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Abstract
Description
Technical Field
[0001] This invention relates to the field of forging technology, specifically a method for forming an ultra-large titanium alloy integral bladed disk forging. Background Technology
[0002] With the technological iteration of high thrust-to-weight ratio aero engines and gas turbines, integral bladed disks, as core rotor components, are constantly pushing the limits in terms of structural dimensions. In particular, the outer diameter of integral bladed disks in the first few stages of fans and high-pressure compressors has generally reached the level of Ø1200mm or even Ø2000mm, and they exhibit extreme geometric characteristics of "large diameter, thin spokes, thick hubs, and narrow flow channels," posing a severe challenge to the forming process.
[0003] Currently, the forging of such ultra-large integral bladed disks mainly faces the following technical bottlenecks: The dual constraints of equipment capacity and mold manufacturing present a significant challenge. In traditional integral closed-die forging, the forming load is directly proportional to the projected area of the forging. When the forging diameter exceeds Ø1200mm, its projected area can be several times or even tens of times larger than that of a traditional small impeller forging. The required peak forming load often exceeds the safe operating tonnage of a conventional 10,000-ton forging press, making equipment capacity a critical bottleneck for process implementation. On the other hand, the weight of the integral mold blank can easily reach tens of tons, resulting in high manufacturing costs. Furthermore, limitations imposed by the loading capacity of large vacuum quenching furnaces and the supply specifications of special steel ingots create a complete manufacturing barrier from "mold blank forging" to "final heat treatment," significantly increasing the mold's manufacturing cost and cycle time.
[0004] Rheological stress mismatch during integral forming. In the forming of ultra-large integral bladed disks, the metal flow rate and equivalent strain are extremely uneven across the hub, spokes, and rim regions. The hub region has a thicker material buildup, requiring high static pressure to close shrinkage cavities, break up coarse grains, and achieve sufficient densification; while the thin-walled blade root cavity in the rim region requires controlled metal flow rate to avoid overfilling leading to folding or flow penetration. The mechanisms of these two defects are diametrically opposed—shrinkage cavities stem from insufficient compaction, while folding stems from overfilling—simultaneously suppressing both defects in the same forming process places extremely high demands on process design. Under the same loading stroke, the cavities of the integral mold are rigidly coupled, making it difficult to coordinate the large differences in deformation requirements across different areas, often resulting in compromises.
[0005] To address the aforementioned issues, while existing technologies have proposed process approaches such as "local loading" or "segmented molding," their core remains limited to optimizing and adjusting process parameters such as molding temperature and reduction amount. They fail to actively reconstruct the mold cavity structure itself, making it difficult to achieve independent control of deformation behavior in different areas. Summary of the Invention
[0006] The technical problem to be solved by the present invention is to provide a method for forming ultra-large titanium alloy integral bladed disk forgings that can overcome the limitations of equipment tonnage and achieve coordinated differential deformation of the hub and rim areas.
[0007] The technical solution adopted by this invention to solve its technical problem is: a method for forming ultra-large titanium alloy integral bladed disk forgings, comprising the following steps: The forming mold is designed with the middle plane of the spokes of the bladed disk forging as the parting surface, and includes an upper mold and a lower mold. The upper mold and the lower mold are both of a split structure, and respectively include a hub part for forming the forged wheel hub, a rim part for forming the forged wheel rim, an blade ring part for forming the forged blade ring, and a flash part for receiving excess material. Assemble the lower mold and spray lubricant onto the surfaces of the cavity of the lower mold and the inner side of the upper mold cavity formed by each part of the upper mold; A columnar titanium alloy billet is placed upright on the hub portion of the lower die. The functional units of the upper die participate in the loading sequentially as follows: In the first stage, the hub portion is loaded independently to initially form the forged hub; in the second stage, the hub portion and the rim portion are loaded together to further form the hub and initially form the rim, while driving the metal to fill towards the blade ring; in the third stage, the hub portion, rim portion, blade ring portion and flash portion are loaded together to finally complete the forming of the hub, rim, blade ring and flash, and obtain the forging. Remove the forging after unloading.
[0008] Furthermore, the diameter of the forging is Ø1200mm~Ø2000mm.
[0009] Furthermore, the pressurization rate in the first stage is 0.5 mm / s to 1 mm / s, and during the pressurization process, the pressure is maintained for 0.5 seconds for every 100 tons increase in loading force, and the pressure is maintained for 10 to 15 seconds after reaching the preset stroke; The pressurization rate in the second stage is 2 mm / s to 4 mm / s, and during the pressurization process, the pressure is maintained for 1 second for every 500 tons of increase in loading force, and the pressure is maintained for 10 to 20 seconds after reaching the preset stroke. In the third stage, the pressurization rate gradually decreases from 3 mm / s to 1 mm / s, and during the pressurization process, the pressure is maintained for 1 second for every 200 tons of loading force, and the pressure is maintained for 10 to 15 seconds after the preset stroke is reached.
[0010] Furthermore, the third stage also includes at least one unload-reload pulsed loading.
[0011] Furthermore, the hub portion of the upper mold and the hub portion of the lower mold each have raised structures on the inner surface of the cavity to increase the friction between them and the blank.
[0012] Furthermore, the rim portion of the upper mold and the rim portion of the lower mold each have annular damping grooves on the inner surface of the cavity. The width of the annular damping grooves is 2mm to 5mm, the depth is 0.5mm to 1.5mm, and the spacing is 5mm to 10mm.
[0013] The beneficial effects of this invention are: By using a split mold structure in conjunction with a three-stage sequential loading strategy, the overall forming force is decomposed into different stages and different mold units, which significantly reduces the peak load required in each stage and breaks through the equipment capacity limitations. The first stage involves independent loading of the hub to pre-compress the thick cross-section area to eliminate shrinkage cavities. The second stage involves coordinated loading of the hub and rim to guide the metal to fill in the blade ring direction in an orderly manner. The third stage involves loading all modules together to complete the final molding. This effectively coordinates the difference in rheological stress between the hub and rim throughout the entire molding cycle, achieving a differentiated molding effect of thick-walled compaction and thin-walled orderly filling, and avoiding folding defects caused by disordered metal flow and overfilling. The split mold structure reduces the manufacturing and maintenance costs of large molds. The orderly flow of metal along a preset path effectively controls the flash volume and improves material utilization. Complete filling of each area ensures controllable dimensional accuracy of the forging, improves the consistency of the structure, and reduces subsequent machining allowances. Overall, it improves the forming quality and engineering economy of ultra-large titanium alloy integral bladed disk forgings. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of the bladed disk forging; Figure 2 This is a schematic diagram of the molding die structure of the present invention; Figure 3 This is a schematic diagram of the forming process of the bladed disk forging; Figure 4 yes Figure 2 Enlarged view of point A; The figure shows: bladed disk forging 1, billet 2, forming mold 3, hub 11, rim 12, blade ring 13, lower mold 31, upper mold 32, hub part 33, rim part 34, blade ring part 35, flash part 36, protruding structure 331, and annular damping groove 341. Detailed Implementation
[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0016] like Figure 1 As shown, the structure of the integral bladed disk forging 1 includes a hub 11, a rim 12, and an blade ring 13 corresponding to the blade portion of the forging and used for subsequent blade processing. The hub 11 is located in the middle of the forging, and the rim 12 is formed by the portion between the hub 11 and the blade ring 13.
[0017] like Figure 2 and Figure 3 As shown, to address the technical challenges of insufficient equipment tonnage and the coexistence of shrinkage cavities and folds due to rheological stress mismatch between the hub and rim regions during the integral forming process for ultra-large titanium alloy integral bladed disk forgings with diameters ranging from Ø1200mm to Ø2000mm, this invention designs the following forming method, including the following steps: S1. Design forming mold 3, wherein the forming mold 3 uses the middle plane of the spoke of the bladed disk forging as the parting surface, and includes an upper mold 32 and a lower mold 31; the upper mold 32 and the lower mold 31 both adopt a split structure, and respectively include a hub part 33 for forming the forged wheel hub, a rim part 34 for forming the forged wheel rim, an blade ring part 35 for forming the forged blade ring, and a flash part 36 for receiving excess material; S2. Assemble the lower mold 31 and spray lubricant onto the surfaces of the cavity of the lower mold 31 and the inner side of the cavity of the upper mold 32. S3. The columnar titanium alloy billet 2 is placed upright on the hub portion 33 of the lower mold 31. The functional units of the upper mold 32 participate in the loading in the following sequence: In the first stage, the hub portion 33 is loaded independently until the outline size of the billet after deformation reaches the boundary position of the cavity of the hub portion, so as to initially form the forged hub; In the second stage, the hub portion 33 and the rim portion 34 are loaded together, and the metal is driven to fill in the direction of the blade ring until the outline size of the billet after deformation reaches the boundary position of the cavity of the rim portion, thereby further forming the hub and initially forming the rim; In the third stage, the hub portion 33, the rim portion 34, the blade ring portion 35 and the flash portion 36 are loaded together until the mold is closed, thereby finally completing the forming of the hub, rim, blade ring and flash, and obtaining the forging; S4. Remove the forging after unloading.
[0018] It should be noted that adjacent parts of the mold can be connected and fixed to each other using bolts, pins, etc.
[0019] like Figure 2 As shown, the hub portion of the upper die will be used for explanation. The surface of the upper die hub portion that forms the inner side of the upper die cavity is the lower end face. During die forging, lubricant is sprayed onto the lower end face of the upper die hub portion.
[0020] This invention addresses the challenges of forging ultra-large titanium alloy integral bladed disks under conditions of insufficient equipment tonnage and stress mismatch between the hub and rim regions, leading to both shrinkage cavities and folds. It employs a split-mold structure with the center plane of the spokes as the parting surface, combined with a three-stage sequential loading strategy. This strategy unfolds the integral forming process in both time and space: the first stage involves independent loading of the hub to pre-compress the thick cross-section region and eliminate shrinkage cavities; the second stage involves coordinated loading of the hub and rim to guide the metal to fill the blade ring direction in an orderly manner; and the third stage involves joint loading of all modules to complete the final forming. This strategy effectively reduces the peak load required at each stage, thus overcoming equipment capacity limitations, while effectively coordinating the stress difference between the hub and rim throughout the entire forming cycle, achieving thick-walled compaction. The differentiated forming effect of thin-walled orderly forming—the so-called thick-walled compaction refers to the full compression and densification of the thick cross-section area of the hub during the first stage of independent loading, eliminating shrinkage defects; the so-called thin-walled orderly forming refers to the orderly filling of the rim and impeller areas with controlled flow rate in subsequent stages, avoiding folding defects—avoiding folding defects caused by disordered metal flow and overfilling; in addition, the split mold structure reduces the manufacturing and maintenance costs of large molds, the orderly flow of metal along the preset path effectively controls the flash volume and improves material utilization, and the complete filling of each area makes the dimensional accuracy of the forging controllable, the consistency of the structure improved, and the subsequent machining allowance reduced, comprehensively improving the forming quality and engineering economy of the ultra-large titanium alloy integral impeller forging.
[0021] Preferably, the pressurization rate in the first stage is 0.5 mm / s to 1 mm / s, and during the pressurization process, the pressure is maintained for 0.5 seconds for every 100 tons increase in loading force, and maintained for 10 to 15 seconds after reaching the preset stroke; the pressurization rate in the second stage is 2 mm / s to 4 mm / s, and during the pressurization process, the pressure is maintained for 1 second for every 500 tons increase in loading force, and maintained for 10 to 20 seconds after reaching the preset stroke; the pressurization rate in the third stage gradually decreases from 3 mm / s to 1 mm / s, and during the pressurization process, the pressure is maintained for 1 second for every 200 tons increase in loading force, and maintained for 10 to 15 seconds after reaching the preset stroke. It should be noted that, in this invention, the "preset stroke" for each stage refers to the downward displacement corresponding to the movement of each functional unit (or combination of functional units working together) of the upper mold from the initial loading position of that stage to the predetermined termination position of that stage. The first stage preset stroke corresponds to the upper die displacement when the profile size of the deformed blank reaches the boundary position of the wheel hub cavity; the second stage preset stroke corresponds to the upper die displacement when the profile size of the deformed blank reaches the boundary position of the wheel rim cavity; and the third stage preset stroke corresponds to the total displacement when all functional units of the upper die are fully closed. The endpoint positions of the preset strokes in each stage can be pre-calibrated through finite element simulation or process experiments to ensure the accurate achievement of the loading targets in each stage.
[0022] By employing differentiated pressurization rates and a stepped pressure holding strategy at each stage, the ultra-large titanium alloy integral bladed disk forging achieves appropriate deformation rates and sufficient stress release at each forming stage, thereby avoiding shrinkage cavities and folding defects and obtaining forgings with dense structure and precise dimensions.
[0023] Furthermore, in order to reduce the average deformation resistance of the billet in the final forging stage, promote deformation penetration to the blade ring and flash area, and at the same time introduce strain path changes through the unloading-reloading process to refine the grains and eliminate residual stress inside the forging, the third stage also includes at least one unloading-reloading pulsating loading.
[0024] Specifically, the pulsed loading is as follows: during the loading process of the third stage, when the loading force of the upper mold reaches the current stage preset loading force, loading is paused and unloading is performed to reduce the loading force to the preset unloading lower limit value, and then it is reloaded to the current stage preset loading force, and this process is repeated at least once.
[0025] Preferably, the unloading amplitude is 20% to 40% of the current stage loading peak, and the unloading-reloading cycle is 2 to 4 times.
[0026] like Figure 4 As shown, furthermore, in order to increase the frictional resistance between the hub cavity surface and the blank, suppress circumferential slippage and eccentric flow of the blank within the hub cavity, and ensure that the blank obtains uniform and symmetrical compression deformation within the hub region, the hub portion 33 of the upper mold 32 and the hub portion 33 of the lower mold 31 each have raised structures 331 on their respective inner surfaces to increase the frictional force with the blank. The height of the raised structures 331 generally does not exceed 1 mm. Preferably, the raised structures are any one or more combinations of annular ribs, strip-shaped ridges, or spherical protrusions; the raised structures are concentrically annularly distributed or radially distributed on the inner surface of the hub portion cavity.
[0027] like Figure 4 As shown, furthermore, in order to suppress excessive metal flow speed and prevent folding defects caused by disordered metal filling during the rim forming stage, annular damping grooves 341 are provided on the inner surface of the cavity of both the rim portion 34 of the upper mold 32 and the rim portion 34 of the lower mold 31. The annular damping grooves are arranged circumferentially along the rim cavity, which dampens and diverts the metal flowing into the rim area, so that the metal fills the rim cavity in an orderly and stable manner, while avoiding air entrapment, folding, or uneven filling caused by excessive metal flow speed or disordered flow direction.
[0028] The cross-sectional shape of the annular damping groove can be rectangular, trapezoidal, or arc-shaped, etc. Through experiments, it is found that, preferably, multiple annular damping grooves are provided, distributed radially at intervals. The groove width of each annular damping groove is 2mm–5mm, the groove depth is 0.5mm–1.5mm, and the spacing between adjacent damping grooves is 5mm–10mm.
[0029] In this invention, the hub portion 33 is preferably made of a high-rigidity mold material, such as H13 steel that has been vacuum-quenched to HRC50 or higher, while the rim portion 34 can be designed with medium rigidity. The flash groove of the flash portion 36 is preferably designed with a gradually decreasing groove depth along the radial direction of the mold, forming a progressive resistance to metal flow.
[0030] Example 1
[0031] The impeller forging has a diameter of Ø1500mm and is made of TC4 material. Simulations show that the applied force during traditional integral closed-die forging is approximately 620MN. The forming process of the aforementioned impeller forging is as follows: 1. Design a forming mold, wherein the forming mold uses the middle plane of the spoke of the bladed disk forging as the parting surface, and includes an upper mold and a lower mold; the upper mold and the lower mold both adopt a split structure, and respectively include a hub part for forming the forged wheel hub, a rim part for forming the forged wheel rim, an blade ring part for forming the forged blade ring, and a flash part for receiving excess material; 2. Assemble the lower mold and spray lubricant onto the surfaces of the cavity of the lower mold and the inner side of the upper mold cavity formed by each part of the upper mold; 3. The cylindrical titanium alloy billet is placed upright on the hub portion of the lower mold, and the functional units of the upper mold participate in the loading sequentially as follows: In the first stage, the wheel hub is loaded independently from 80MN to 100MN at a pressurization rate of 0.5mm / s. During the pressurization process, the pressure is maintained for 0.5 seconds for every 100 tons increase in loading force, and the pressure is maintained for 10 seconds after reaching the preset stroke, thus initially forming the forged wheel hub. In the second stage, the hub part 33 and the rim part 34 work together to load the load, with a loading force of 150MN to 230MN and a pressurization speed of 2mm / s. During the pressurization process, the load is held for 1 second for every 500 tons of increase in loading force, and the pressure is held for 10 seconds after the preset stroke is reached. In the third stage, the hub part 33, the rim part 34, the blade ring part 35, and the flash part 36 are jointly loaded, with the loading force ranging from 280MN to 410MN. The pressurization speed gradually decreases from 3mm / s to 1mm / s. During the pressurization process, the pressure is maintained for 1 second for every 200 tons of increase in loading force. When the loading force reaches 400MN, an unloading-reloading "pulsating loading" cycle is added. After reaching the preset stroke, the pressure is maintained for 10 seconds. 4. Remove the forging after unloading.
[0032] Conclusion: The load is significantly reduced compared to traditional integral closed die forging. The hub area of the forging is fully compacted in the first stage, eliminating internal shrinkage defects and achieving good microstructure density. The rim and blade ring areas are filled with metal in a controlled and orderly manner, without defects such as folding or flow through. The dimensional accuracy of the forging meets the design requirements.
[0033] Example 2
[0034] The impeller forging has a diameter of Ø1800mm and is made of TC11 material. Simulations show that the applied force during traditional integral closed-die forging is approximately 780MN. The forming process of the aforementioned impeller forging is as follows: 1. Design a forming mold, wherein the forming mold uses the middle plane of the spoke of the bladed disk forging as the parting surface, and includes an upper mold and a lower mold; the upper mold and the lower mold both adopt a split structure, and respectively include a hub part for forming the forged wheel hub, a rim part for forming the forged wheel rim, an blade ring part for forming the forged blade ring, and a flash part for receiving excess material; 2. Assemble the lower mold and spray lubricant onto the surfaces of the cavity of the lower mold and the inner side of the upper mold cavity formed by each part of the upper mold; 3. The cylindrical titanium alloy billet is placed upright on the hub portion of the lower mold, and the functional units of the upper mold participate in the loading sequentially as follows: In the first stage, the wheel hub is loaded independently with a loading force of 120MN to 200MN and a pressurization rate of 0.8mm / s. During the pressurization process, the pressure is maintained for 0.5 seconds for every 100 tons increase in loading force, and the pressure is maintained for 13 seconds after reaching the preset stroke, thus initially forming the forged wheel hub. In the second stage, the hub part 33 and the rim part 34 work together to load the load, with a loading force of 240MN to 350MN and a pressurization speed of 3mm / s. During the pressurization process, the pressure is maintained for 1 second for every 500 tons of loading force increase, and the pressure is maintained for 15 seconds after the preset stroke is reached. In the third stage, the hub part 33, the rim part 34, the blade ring part 35, and the flash part 36 are jointly loaded, with the loading force ranging from 420MN to 580MN. The pressurization speed gradually decreases from 3mm / s to 1mm / s. During the pressurization process, the pressure is maintained for 1 second for every 200 tons of increase in loading force. When the loading force reaches 500MN, an unloading-reloading "pulsating loading" cycle is added. After reaching the preset stroke, the pressure is maintained for 13 seconds. 4. Remove the forging after unloading.
[0035] Conclusion: The load is significantly reduced compared to traditional integral closed die forging. The hub area of the forging is fully compacted in the first stage, eliminating internal shrinkage defects and achieving good microstructure density. The rim and blade ring areas are filled with metal in a controlled and orderly manner, without defects such as folding or flow through. The dimensional accuracy of the forging meets the design requirements.
[0036] Example 3
[0037] The impeller forging has a diameter of Ø2000mm and is made of Ti65. Simulations show that the applied force during traditional integral closed-die forging exceeds 800MN, making it unsuitable for current equipment. The forming process for the aforementioned impeller forging is as follows: 1. Design a forming mold, wherein the forming mold uses the middle plane of the spoke of the bladed disk forging as the parting surface, and includes an upper mold and a lower mold; the upper mold and the lower mold both adopt a split structure, and respectively include a hub part for forming the forged wheel hub, a rim part for forming the forged wheel rim, an blade ring part for forming the forged blade ring, and a flash part for receiving excess material; 2. Assemble the lower mold and spray lubricant onto the surfaces of the cavity of the lower mold and the inner side of the upper mold cavity formed by each part of the upper mold; 3. The cylindrical titanium alloy billet is placed upright on the hub portion of the lower mold, and the functional units of the upper mold participate in the loading sequentially as follows: In the first stage, the wheel hub is loaded independently with a loading force of 300MN to 380MN and a pressurization speed of 1mm / s. During the pressurization process, the pressure is maintained for 0.5 seconds for every 100 tons increase in loading force, and the pressure is maintained for 15 seconds after reaching the preset stroke, thus initially forming the forged wheel hub. In the second stage, the hub part 33 and the rim part 34 work together to load the load, with a loading force of 460MN to 520MN and a pressurization speed of 4mm / s. During the pressurization process, the pressure is maintained for 1 second for every 500 tons of loading force, and the pressure is maintained for 20 seconds after the preset stroke is reached. In the third stage, the hub part 33, the rim part 34, the blade ring part 35, and the flash part 36 are jointly loaded, with the loading force increasing from 550MN to 780MN. The pressurization speed gradually decreases from 3mm / s to 1mm / s. During the pressurization process, the pressure is maintained for 1 second for every 200 tons increase in loading force. When the loading force reaches 750MN, an unloading-reloading "pulsating loading" cycle is added. After reaching the preset stroke, the pressure is maintained for 15 seconds. 4. Remove the forging after unloading.
[0038] Conclusion: The load is significantly reduced compared to traditional integral closed die forging. The hub area of the forging is fully compacted in the first stage, eliminating internal shrinkage defects and achieving good microstructure density. The rim and blade ring areas are filled with metal in a controlled and orderly manner, without defects such as folding or flow through. The dimensional accuracy of the forging meets the design requirements.
Claims
1. A method for forming ultra-large titanium alloy integral bladed disk forgings, characterized in that, Includes the following steps: The forming mold is designed with the middle plane of the spoke of the bladed disk forging as the parting surface, including an upper mold (32) and a lower mold (31); the upper mold (32) and the lower mold (31) are both of a split structure, including a hub part (33) for forming the forged wheel hub, a rim part (34) for forming the forged wheel rim, a blade ring part (35) for forming the forged blade ring, and a flash part (36) for receiving excess material. Assemble the lower mold (31) and spray lubricant onto the surfaces of the cavity of the lower mold (31) and the inner side of the cavity of the upper mold (32) formed by each part of the upper mold (32); The columnar titanium alloy billet is placed upright on the hub portion (33) of the lower mold (31). The functional units of the upper mold (32) participate in the loading in the following sequence: In the first stage, the hub portion (33) is loaded independently to initially form the forged hub; in the second stage, the hub portion (33) and the rim portion (34) are loaded together to further form the hub and initially form the rim, while driving the metal to fill towards the blade ring; in the third stage, the hub portion (33), the rim portion (34), the blade ring portion (35) and the flash portion (36) are loaded together to finally complete the forming of the hub, rim, blade ring and flash, and obtain the forging. Remove the forging after unloading.
2. The forming method of the ultra-large titanium alloy integral bladed disk forging as described in claim 1, characterized in that, The diameter of the forging is Ø1200mm~Ø2000mm.
3. The forming method of the ultra-large titanium alloy integral bladed disk forging as described in claim 1 or 2, characterized in that, The pressurization rate in the first stage is 0.5 mm / s to 1 mm / s, and during the pressurization process, the pressure is maintained for 0.5 seconds for every 100 tons increase in loading force, and the pressure is maintained for 10 to 15 seconds after reaching the preset stroke. The pressurization rate in the second stage is 2 mm / s to 4 mm / s, and during the pressurization process, the pressure is maintained for 1 second for every 500 tons of increase in loading force, and the pressure is maintained for 10 to 20 seconds after reaching the preset stroke. In the third stage, the pressurization rate gradually decreases from 3 mm / s to 1 mm / s, and during the pressurization process, the pressure is maintained for 1 second for every 200 tons of loading force, and the pressure is maintained for 10 to 15 seconds after the preset stroke is reached.
4. The forming method of the ultra-large titanium alloy integral bladed disk forging as described in claim 1, characterized in that, The third stage also includes at least one unload-reload pulsed loading.
5. The forming method of the ultra-large titanium alloy integral bladed disk forging as described in claim 1, characterized in that, The hub portion (33) of the upper mold (32) and the hub portion (33) of the lower mold (31) each have a raised structure (331) on the inner side surface of the cavity to increase the friction between the material and the blank.
6. The forming method of the ultra-large titanium alloy integral bladed disk forging as described in claim 1, characterized in that, The rim portion (34) of the upper mold (32) and the rim portion (34) of the lower mold (31) are each provided with an annular damping groove (341) on the inner side surface of the cavity. The annular damping groove (341) has a groove width of 2mm to 5mm, a depth of 0.5mm to 1.5mm, and a spacing of 5mm to 10mm.