CN115870436A - Two-stage disc and manufacturing method thereof - Google Patents
Two-stage disc and manufacturing method thereof Download PDFInfo
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- CN115870436A CN115870436A CN202111143706.XA CN202111143706A CN115870436A CN 115870436 A CN115870436 A CN 115870436A CN 202111143706 A CN202111143706 A CN 202111143706A CN 115870436 A CN115870436 A CN 115870436A
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Abstract
The invention discloses a double-stage disc and a manufacturing method thereof, wherein the double-stage disc comprises an upper-stage blade disc and a lower-stage blade disc, and the manufacturing method of the double-stage disc comprises the following steps: s1, pre-forging a titanium alloy bar through a die to obtain a pre-forged piece; s2, performing die forging on the pre-forged piece through a die to obtain a die forged piece; s3, cutting off the area between the upper-level leaf disc part and the lower-level leaf disc part in the die forging to the area close to the joint of the upper-level leaf disc and the lower-level leaf disc, and cutting off to obtain an integrated part; s4, carrying out heat treatment on the integrated piece; and S5, machining the integrated piece after the heat treatment is finished. The integral forging reduces the working procedures, reduces the cost and the production period, and simultaneously prevents the problems of machining deformation, reduced performance of welding seams, tissue difference and the like caused by welding residual stress. Under the condition of not changing the performance of the disc, the manufacturing cost and the period are reduced, and the defects caused by an inertia friction technology and a bolt connecting technology are avoided.
Description
Technical Field
The invention provides a dual-stage disk and a manufacturing method thereof.
Background
The large passenger engine is a typical fan engine with a large bypass ratio, and is developed to meet the power requirement of civil large airplanes in China. Compared with a large-scale transport engine, the large-scale transport engine has the advantages that the service life is longer, the reliability is higher, the cost is lower, the high-pressure compressor disk is one of the key cold end components of the large-scale transport engine, and the high-pressure compressor disk can be safely used under the conditions that the total decline is met, and the red line temperature and the red line rotating speed are reached simultaneously according to the airworthiness requirement.
For commercial engines, stress spikes at low temperatures, high stress and temperature transitions interact to make the load holding phenomenon more severe. In order to improve the fatigue life and reliability, all the disc parts of the high-pressure compressor of the large-scale engine are welded or connected through bolts, the fretting wear at the joints can be increased through the bolt connection mode among the disc parts, and the service life of the disc bodies is shortened. The main forging process of the single-stage compressor disk comprises the steps of blanking, cake upsetting, die forging, heat treatment, machining and flaw detection. And because the difference of joint crack propagation performance in the welding performance of the titanium alloy is more than that of the base metal, the impact performance is only 1/2 of that of the base metal, the problems of poor fracture toughness of a heat affected zone, acceleration of crack expansion and the like exist in the welding of the alloy, and the design requirements cannot be met.
Disclosure of Invention
The invention aims to solve the technical problems that the service life of the threaded connection between the disc parts is shortened and the fracture toughness of the welding between the disc parts is poor in the prior art, and provides a manufacturing method of a double-stage disc.
The invention solves the technical problems through the following technical scheme:
a method of manufacturing a dual stage disk including an upper stage blisk and a lower stage blisk, the method comprising:
s1, pre-forging a titanium alloy bar through a die to obtain a pre-forged piece;
s2, performing die forging on the pre-forged piece through a die to obtain a die forged piece;
s3, cutting off the area between the upper-level leaf disc part and the lower-level leaf disc part in the die forging to the area close to the joint of the upper-level leaf disc and the lower-level leaf disc, and cutting off to obtain an integrated part;
s4, carrying out heat treatment on the integrated piece;
and S5, machining the integrated piece subjected to heat treatment.
In the technical scheme, the double-stage disc is integrally forged, so that the process is reduced, the cost and the production period are reduced, and the problems of machining deformation, reduced performance of welding seams, tissue difference and the like caused by welding residual stress are solved. The pre-forging and die forging enable the integral piece with a larger volume to deform uniformly, the maximum strain and the maximum temperature are well controlled, and the risk of forming a recrystallization structure is reduced. The mode of locally cutting off the forged integrated piece improves the material performance of the joint of the upper-level blade disc and the lower-level blade disc during subsequent heat treatment, so that the manufacturing cost and the manufacturing period can be reduced under the condition of not changing the performance of the disc piece by the integral forging scheme, and the defects caused by inertia friction and bolt connection are avoided.
Preferably, in step S3, the ablation depth is a depth that the flaw detection probe can extend into and detect.
In the technical scheme, the die forging piece is machined into a specific shape, so that the disc body is thoroughly quenched without influencing nondestructive testing, and the performance of the core part of the two-stage disc die forging piece is ensured.
Preferably, the secondary disk includes a blisk inter-stage drum, and in step S3, when the die forging is cut, hollowing is performed in two directions from the core to the rim and from the rim to the core in the die forging at the blisk inter-stage drum portion.
In the technical scheme, the die forging piece is cut off along the blisk interstage drum barrel, so that the die forging piece can be fully quenched, and meanwhile, the detection of the flaw detection probe extending into the blisk interstage drum barrel cannot be influenced.
Preferably, in step S4, the heat treatment of the integrated piece includes solution treatment and aging treatment sequentially.
In the technical scheme, the integrated piece is subjected to heat treatment, carbides in the base body are digested, stress is eliminated, the hardness and strength are increased through aging treatment, the plastic toughness is increased, and the service life of the integrated piece is prolonged.
Preferably, the heating temperature of the solution treatment is 800 ℃, and the heat preservation is carried out for at least 4 hours.
In the technical scheme, the solution treatment keeps a lower temperature, the heat preservation time is prolonged, and the energy can be saved.
Preferably, the heating temperature of the aging treatment is 630 ℃, and the temperature is kept for at least 8 hours.
In the technical scheme, the material is stored for a long time at a high temperature to generate an aging process.
Preferably, in step S1, the maximum equivalent plastic strain of the pre-forging is 0.99, and the average value is 0.72.
Preferably, in step S2, the minimum value of the equivalent plastic strain of the die forging is 0.8, and the maximum value is 1.4.
In the technical scheme, the minimum value of the equivalent plastic strain of the die forging piece is 0.8, the influence of human and equipment errors on the deformation in the forging process is avoided, the minimum deformation is achieved, and the microstructure and the mechanical property of the die forged intermediate are ensured.
Preferably, the temperature of the die forging treatment is always higher than the phase transformation temperature of the titanium alloy bar.
In the technical scheme, the die forging is carried out above the phase transition temperature, so that the aluminum alloy bar is easy to generate phase transition.
A dual stage disk is made by the method of manufacturing the dual stage disk.
In the technical scheme, the integrally manufactured double-stage disc is adopted, so that the defect of welding or bolt connection is overcome, and the manufacturing cost and the manufacturing period are reduced.
The positive progress effects of the invention are as follows:
the double-stage disc is integrally forged, so that the process is reduced, the cost and the production period are reduced, and the problems of machining deformation, reduced performance of welding seams, tissue difference and the like caused by welding residual stress are solved. The integral piece with larger volume is uniformly deformed by pre-forging and die forging, the maximum strain and the maximum temperature are well controlled, and the risk of forming a recrystallization structure is reduced. The mode of locally cutting off the forged integrated piece improves the material performance of the joint of the upper-level blade disc and the lower-level blade disc during subsequent heat treatment, so that the manufacturing cost and the manufacturing period can be reduced under the condition of not changing the performance of the disc piece by the aid of the integral forging scheme, and meanwhile, the defects caused by inertia friction and bolt connection are avoided.
Drawings
FIG. 1 is a flow chart of a method for manufacturing a dual-stage disk according to a preferred embodiment of the present invention.
FIG. 2 is a drawing of a monolithic forging for a dual stage disk in a preferred embodiment of the invention.
FIG. 3 is a comparison of the microstructure of a typical position of an integral dual stage disk in a preferred embodiment of the invention.
Description of the reference numerals
Superior bladed disk 100
Third stage blade disc flange 1
Third stage bladed disk drum 2
Third stage bladed disk blade 3
Fourth stage bladed disk blade 4
Fourth stage blisk drum 5
Fourth stage blade disc flange 6
Fourth stage impeller disk web 7
Fourth stage bladed disk hub 8
Inter-stage drum 9 of blade disc
Third stage disk web 10
Third stage bladed disk hub 11
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
As shown in fig. 1 and 2, the present invention provides a dual-stage disk and a method of manufacturing the same, the dual-stage disk including an upper stage blisk 100 and a lower stage blisk 200, the upper stage blisk 100 and the lower stage blisk 200 being integrally formed and made of a titanium alloy. In this embodiment, the upper stage blisk 100 is a compressor third stage blisk, and the lower stage blisk 200 is a compressor fourth stage blisk.
The method of manufacturing the dual-stage disk includes:
s1, pre-forging a titanium alloy bar through a die to obtain a pre-forged piece;
s2, performing die forging on the pre-forged piece through the die to obtain a die forged piece;
s3, cutting off the area between the upper-stage blade disc 100 part and the lower-stage blade disc 200 part in the die forging to the area close to the joint of the upper-stage blade disc 100 and the lower-stage blade disc 200, and cutting off to obtain an integrated piece;
s4, carrying out heat treatment on the integrated piece;
and S5, machining the integrated piece after the heat treatment is finished.
The double-stage disc is integrally forged, so that the process is reduced, the cost and the production period are reduced, and the problems of machining deformation, reduced performance of welding seams, tissue difference and the like caused by welding residual stress are solved. The integral piece with larger volume is uniformly deformed by pre-forging and die forging, the maximum strain and the maximum temperature are well controlled, and the risk of forming a recrystallization structure is reduced. The mode of locally cutting off the forged integrated piece improves the material performance of the joint of the upper-level blade disc and the lower-level blade disc during subsequent heat treatment, so that the manufacturing cost and the manufacturing period can be reduced under the condition of not changing the performance of the disc piece by the aid of the integral forging scheme, and meanwhile, the defects caused by inertia friction and bolt connection are avoided.
In the step S1, an aluminum alloy bar is made of a Ti17 bar with the diameter of 300 phi and the length of 620mm, after the machined end face of the blank is corroded, the temperature T beta-30 ℃ of a two-phase region is selected for one-fire forging until the diameter of 400 phi and the height of 350mm are about, and rough edges are removed by machining. The pre-forging is to place the material in a die used for pre-forging, and the material is forged to a certain shape, so that the material flow is restrained, and the deformation is more uniform than that of free forging. The mold in step S1 is different from the mold in step S2.
In step S1, the equivalent plastic strain of the preforged piece is 0.99 at maximum, with an average value of 0.72.
In step S2, the temperature T at the phase transformation point is selected β And (6) performing one-fire die forging at the temperature of +30 ℃. The average equivalent plastic strain of the die forging is 1.08, the minimum value is 0.8, the maximum value is 1.4, the sufficient and uniform deformation of the die forging can be ensured, and the structure control is realized. The selected materials of the die forging die are H13 and 5CrNiMoV. In step S2, the die forging temperature is always higher than the transformation temperature T β The forging is performed at a transformation temperature, so that the forged body is likely to undergo phase transformation.
In the step S3, the core part of the die forging piece is partially hollowed, so that the disc piece is fully quenched without influencing nondestructive testing, the effective thickness of the die forging piece is reduced to the maximum extent, and the performance of the integral double-stage disc after core part heat treatment is improved. The cutting depth is the depth that the flaw detection probe can extend into and detect, and the die forging piece is machined into a specific shape, so that the disc body is thoroughly quenched without affecting nondestructive detection, and the performance of the core part of the double-stage disc die forging piece is ensured.
The secondary disc includes a blisk inter-stage drum 9, and hollowing is performed in two directions from the core to the rim and from the rim to the core in a portion of the stamper located at the blisk inter-stage drum 9 at the time of cutting off the stamper in step S3. And cutting off the die forging along the blisk interstage drum 9, so that the die forging can be quenched completely, and meanwhile, the detection of the flaw detection probe extending into the interstage tympanic membrane cannot be influenced.
In step S4, the heat treatment system is: the solution heating temperature is 800 ℃, and the temperature is kept for at least 240min; the aging heating temperature is 630 ℃, and the heat preservation is carried out for at least 480min. The carbide in the base body is dissolved and heated, the stress is eliminated, the hardness and the strength are increased through aging treatment, the plastic toughness is increased, and the service life of the integrated piece is prolonged. The solution treatment keeps a lower temperature, increases the heat preservation time and can save energy. The aging treatment is to store the material at a higher temperature for a longer time so as to generate an aging process.
In step S5, the heat-treated integrated material is machined to form the upper-stage blisk 100 and the lower-stage blisk 200.
The invention also discloses a double-stage disc, which is manufactured by the manufacturing method of the double-stage disc. The integrally manufactured double-stage disc avoids the defects of welding or bolt connection, and reduces the manufacturing cost and the period.
Table 1 shows the room temperature and high temperature tensile properties results for the key areas of mechanical properties of the dual stage disc integral forging and the single stage disc forging in the key directions of interest. The room-temperature tensile properties of the chord direction of the blade, the radial direction of the web, the chord direction of the interstage drum and the chord direction of the hub are all similar. The radial 200 ℃ high-temperature tensile strength of the web of the double-stage disc forging is higher than that of the single-stage disc forging. Therefore, the tensile property of the double-stage disc forging is equal to or higher than that of the single-stage disc forging.
TABLE 1 comparison of Room temperature tensile Properties of Single-stage disk and Dual-stage disk forgings at various positions and orientations
As shown in Table 2, the fracture toughness performance of the double-stage disk web in the C-R and R-C directions is higher than that of the single-stage disk web in the corresponding positions and directions, and the technical requirements are met.
TABLE 2 comparison of fracture toughness Properties of single-stage disk and double-stage disk forgings at various positions and directions
As shown in fig. 2 and 3, fig. 3 includes a third stage blisk flange 1, a third stage blisk drum 2, a third stage blisk blade 3, a fourth stage blisk blade 4, a fourth stage blisk drum 5, a fourth stage blisk flange 6, a fourth stage blisk web 7, a fourth stage blisk hub 8, a blisk inter-stage drum 9, a third stage blisk web 10, and a third stage blisk hub 11.
The position of the inter-stage drum barrel 9 of the blade disc in the figure 2 is particularly required to be focused, the position is positioned at the core part of the integral forging piece, namely the center of the section thickness of the disc piece, and the performance after heat treatment is the worst theoretically, so that the inter-stage drum barrel is a region in which the mechanical property needs to meet the design requirement in the patent. The corresponding mechanical properties are the inter-stage drum-chord position in table 2. The room temperature mechanical property is 1145Mpa, compared with the single-stage disc drum, the position strength is slightly lower, but the plasticity is higher, and the standard requirement and the design requirement are met. The advantages of this scheme are illustrated.
In conclusion, the mechanical property of the double-stage disc forging is equal to or higher than that of the single-stage disc forging.
The microstructure of the key area of the double-stage disc integral forged piece and the single-stage disc forged piece is compared and analyzed (the forged piece shape shown in figure 2):
microstructures from six focal regions: the six positions of the blade tip, the blade root, the drum barrel, the web plate, the wheel hub and the interstage drum barrel, twelve microstructures of the integral disc shaft forging and the single-stage disc forging are basket tissues formed after forging and heat treatment, the needle-shaped alpha phase in the beta crystal grain is obvious, all original beta crystal boundaries are broken, and thick, straight and continuous crystal boundary alpha phases are not seen. The microscopic structures are all consistent, and the design performance requirements are met. The 9 locations (inter-stage drums) of particular interest in fig. 2, which are at the center of the cross-sectional thickness of the disc, have a microstructure (see fig. 3 (l)) that is consistent with the microstructure of the single stage disc in the same location (see fig. 3 (i)), and the basket weave pattern is good.
Therefore, the microstructure of the double-stage disc forging is consistent with that of the single-stage disc forging.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes or modifications to these embodiments may be made by those skilled in the art without departing from the principle and spirit of this invention, and these changes and modifications are within the scope of this invention.
Claims (10)
1. A method of manufacturing a dual stage disk including an upper stage blisk and a lower stage blisk, the method comprising:
s1, pre-forging a titanium alloy bar through a die to obtain a pre-forged piece;
s2, performing die forging on the pre-forged piece through a die to obtain a die forged piece;
s3, cutting off the area between the upper-level leaf disc part and the lower-level leaf disc part in the die forging to the area close to the joint of the upper-level leaf disc and the lower-level leaf disc, and cutting off to obtain an integrated part;
s4, carrying out heat treatment on the integrated piece;
and S5, machining the integrated piece after the heat treatment is finished.
2. The method of manufacturing a double-stage disk according to claim 1, wherein in step S3, the depth of the ablation is a depth into which the flaw detection probe can be inserted and detected.
3. The method of manufacturing a multistage disc according to claim 1, wherein the multistage disc includes a blisk interstage drum, and in step S3, when the forged die piece is cut, hollowing is performed in two directions from a core portion to a rim and from the rim to the core portion in the forged die piece at the blisk interstage drum portion.
4. The method of manufacturing a dual stage disk according to claim 1, wherein the heat treatment of the integrated member in step S4 comprises solution treatment and aging treatment which are sequentially performed.
5. The method of manufacturing a dual stage disk according to claim 4, wherein the solution treatment is performed at a heating temperature of 800 ℃ for at least 4 hours.
6. The method for manufacturing a two-stage disk according to claim 4, wherein the heating temperature of the aging treatment is 630 ℃ and the temperature is maintained for at least 8 hours.
7. The method of manufacturing a dual stage disk of claim 1, wherein in step S1, the equivalent plastic strain of the pre-forging is 0.99 at maximum and 0.72 on average.
8. The method of manufacturing a dual stage disk according to claim 1, wherein in step S2, the minimum value of the equivalent plastic strain of the die forging is 0.8 and the maximum value is 1.4.
9. The method of manufacturing a dual stage disk of claim 1, wherein the temperature of the swaging process is always above the transformation temperature of the titanium alloy rod.
10. A dual stage disk, wherein the dual stage disk is produced by the method of manufacturing a dual stage disk according to any one of claims 1 to 9.
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| CN202111143706.XA CN115870436A (en) | 2021-09-28 | 2021-09-28 | Two-stage disc and manufacturing method thereof |
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| CN202111143706.XA CN115870436A (en) | 2021-09-28 | 2021-09-28 | Two-stage disc and manufacturing method thereof |
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| CN115870436A true CN115870436A (en) | 2023-03-31 |
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| CN202111143706.XA Pending CN115870436A (en) | 2021-09-28 | 2021-09-28 | Two-stage disc and manufacturing method thereof |
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