CN117182288A - Welding joint shape design method for linear friction welding of titanium alloy of blisk - Google Patents
Welding joint shape design method for linear friction welding of titanium alloy of blisk Download PDFInfo
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- CN117182288A CN117182288A CN202311464805.7A CN202311464805A CN117182288A CN 117182288 A CN117182288 A CN 117182288A CN 202311464805 A CN202311464805 A CN 202311464805A CN 117182288 A CN117182288 A CN 117182288A
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- 238000003466 welding Methods 0.000 title claims abstract description 187
- 238000000034 method Methods 0.000 title claims abstract description 29
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 9
- 238000013461 design Methods 0.000 title abstract description 11
- 238000004088 simulation Methods 0.000 claims abstract description 56
- 238000012544 monitoring process Methods 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 9
- 238000004904 shortening Methods 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- 238000012938 design process Methods 0.000 claims description 3
- 238000005457 optimization Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
Abstract
The invention belongs to the technical field of linear friction welding, and particularly relates to a welding joint shape design method for linear friction welding of titanium alloy of a blisk. The technical proposal is as follows: according to the blade profile of the weld joint of the blisk, designing the original cross-sectional shape of a welded joint, and processing a TC4 welding simulation piece I and a TC17 welding simulation piece I; performing linear friction welding, and monitoring heat in a welding process by using a temperature measuring device; the cross section shape of the welding joint is optimally designed, and a second TC4 welding simulation piece and a second TC17 welding simulation piece are processed; and C4, performing linear friction welding on the second welding simulation piece and the second welding simulation piece TC17, and monitoring heat in the welding process by using a temperature measuring device so as to verify that the shape of the welded joint meets the welding technical requirement. The invention monitors the temperature field of the welding interface by using the thermocouple, and corrects and optimizes the shape and structure of the welding joint through the change of the temperature field, so that the temperature field of the welding joint is kept in a similar range.
Description
Technical Field
The invention belongs to the technical field of linear friction welding, and particularly relates to a welding joint shape design method for linear friction welding of titanium alloy of a blisk.
Background
The blisk is a core component for realizing structural innovation and technical crossing of a new generation of aero-engines, and has become a necessary structure of the engines with the thrust-weight ratio of 10 and above. However, the blisk is widely made of high-performance metal materials such as titanium alloy and high-temperature alloy, and has the characteristics of thin radial plate, large area, complex blade profile, nonlinear and narrow flow passage and the like, so that the manufacturing technical requirement is extremely high, and the comprehensive manufacturing process technology of the blisk becomes a worldwide difficult problem. Compared with other technologies, the linear friction welding can obtain a high-performance high-quality welding joint, has unique advantages in the manufacturing technology of the blisk, can realize high-efficiency, low-cost and high-reliability processing and repairing of the blisk, and is the only technical means for realizing the manufacturing of the hollow blade and the blisk made of dissimilar materials.
Linear friction welding can achieve welding of two different materials. The linear friction welding is to produce friction heat and plastic deformation heat by repeated friction movement in one direction, and combine the pressure perpendicular to the vibration direction to make the welded joint form excellent metallurgical combination under the double action of thermal coupling. However, blisk linear friction weld joints generally require structural and shape design based on the blade shape of the weld face, typically exhibiting a "C" configuration. The repeated vibration along a certain direction reduces the stress of the welding interface and the uniformity of the temperature field under the shape, the heat generation of each section is inconsistent, the temperature change of each section is more than 100 ℃, the welding quality is poor, and the manufacturing quality of the aeroengine fan blisk is further influenced. In the present stage, manual experience is generally adopted, and a large number of iterative experiments are carried out by combining a trial-and-error method, so that an optimal welding structure is obtained, and the defects of long trial production period, high trial production cost, poor trial production effect and the like are caused. Therefore, there is a need for a linear friction weld joint design method based on blisks.
Disclosure of Invention
The invention provides a method for designing the shape of a welding joint of a titanium alloy linear friction welding of a blisk, which utilizes a thermocouple to monitor the temperature field of a welding interface, corrects and optimizes the shape structure of the welding joint through the change of the temperature field, so that the temperature field of the welding joint is kept in a similar range, and the optimal design of the shape of the welding joint is realized.
The technical scheme of the invention is as follows:
a welding joint shape design method for linear friction welding of a titanium alloy of a blisk comprises the following steps:
and (3) a step of: designing the original section shape of a welded joint according to the profile of a welding seam of the blisk;
and II: processing a TC4 welding simulation piece I and a TC17 welding simulation piece I according to the original cross-sectional shape of the welding joint;
thirdly,: performing linear friction welding on the TC4 welding simulation piece I and the TC17 welding simulation piece I, and monitoring heat in a welding process by using a temperature measuring device;
fourth, the method comprises the following steps: optimally designing the cross section shape of the welding joint according to the monitoring result;
fifth step: processing a second TC4 welding simulation piece and a second TC17 welding simulation piece according to the optimized cross section shape of the welding joint;
sixth,: and C4, performing linear friction welding on the second welding simulation piece and the second welding simulation piece TC17, and monitoring heat in the welding process by using a temperature measuring device so as to verify that the shape of the welded joint meets the welding technical requirement.
Further, according to the method for designing the shape of the welding joint of the integral She Pantai alloy linear friction welding, the temperature measuring device comprises a thermocouple, a wire and a monitor, and the thermocouple is connected with the monitor through the wire.
In the second and fifth steps, when the first, second and second TC4, first and second TC17 welding simulators are processed, welding bosses are processed, the heights of the welding bosses of the first and second TC4 welding simulators are larger than the welding axial shortening amount of TC4, and the heights of the welding bosses of the first and second TC17 welding simulators are larger than the welding axial shortening amount of TC 17; the side faces of the welding bosses of the TC4 welding simulation piece I and the TC4 welding simulation piece II are provided with a plurality of thermocouple installation holes, and a plurality of thermocouples of the temperature measuring device are placed in the thermocouple installation holes.
In the first step, the profile of the weld joint of the blisk is uniformly and outwardly increased by 3mm to be used as the original section shape of the welded joint.
In the fourth step, according to the judgment of the monitoring result, when the first TC4 welding simulation piece and the first TC17 welding simulation piece perform linear friction welding, the heat generated at the two ends of the first TC4 welding simulation piece and the first TC17 welding simulation piece are lower than those of the middle part, and the shapes of the two ends of the first TC4 welding simulation piece and the first TC17 welding simulation piece need to be optimally designed; the optimization design process is as follows: the highest point of the blade profile at the weld joint of the blisk in the vibration direction of the linear friction welding is taken as a point I, a line perpendicular to the vibration direction is made through the point I as a line I, and two intersection points of the line I and the blade profile at the weld joint of the blisk are respectively a point II and a point III; the highest point of the original section of the welding joint along the vibration direction is taken as a point IV, a connecting line between the point II and the point IV is taken as a line II, and a connecting line between the point III and the point IV is taken as a line III; the furthest point between the outer edge line of the original section of the welded joint between the point two and the point four and the line two is taken as a point five, and the furthest point between the outer edge line of the original section of the welded joint between the point three and the point four and the line three is taken as a point six; making a line perpendicular to the vibration direction through the point IV as a line IV, taking the intersection point of the lead wire in the vibration direction and the line IV as a point seven, and taking the intersection point of the lead wire in the vibration direction and the line IV as a point eight; the fourth point is offset outwards by 2mm along the vibration direction to be regarded as a ninth point; and forming the optimized cross section shape of the welding joint through smooth connecting lines among the points II, seven, nine, eight and three.
The beneficial effects of the invention are as follows: the shape design method of the welding joint for the integral She Pantai alloy linear friction welding utilizes the thermocouple to monitor the temperature field of the welding interface, corrects and optimizes the shape structure of the welding joint through the change of the temperature field, so that the temperature field of the welding joint is kept in a similar range, the optimal design of the shape of the welding joint is realized, the design efficiency and accuracy of the structure of the welding joint are effectively improved, the research and development period is shortened, and the research and development cost is reduced.
Drawings
FIG. 1 is a front view of a TC4 weld simulator;
FIG. 2 is a right side view of the TC4 weld simulator;
FIG. 3 is a front view of a TC17 weld simulator;
FIG. 4 is a left side view of a TC17 weld simulator;
FIG. 5 is a schematic diagram of a temperature measuring device for monitoring heat during a welding process;
FIG. 6 is a schematic diagram of a process for optimizing the cross-sectional shape of a welded joint.
Detailed Description
As shown in fig. 1-6, a method for designing the shape of a welded joint of a blisk titanium alloy by linear friction welding comprises the following steps:
and (3) a step of: uniformly and outwards increasing the blade profile 31 at the weld joint of the blisk by 3mm to be used as the original section 32 shape of the welded joint;
and II: machining a TC4 welding simulation part I1 and a TC17 welding simulation part I4 according to the original cross section 32 shape of the welding joint; processing welding bosses on a TC4 welding simulation piece 1 and a TC17 welding simulation piece 4, wherein the height of a welding boss 2 of the TC4 welding simulation piece 1 is larger than the welding axial shortening amount of TC4, and the height of a welding boss 5 of the TC17 welding simulation piece 4 is larger than the welding axial shortening amount of TC 17; a plurality of thermocouple mounting holes 3 are formed in the side face of the welding boss 2 of the TC4 welding simulation piece I1;
thirdly,: performing linear friction welding on the TC4 welding simulation piece 1 and the TC17 welding simulation piece 4, and monitoring heat in the welding process by using a temperature measuring device; the temperature measuring device comprises a thermocouple 6, a wire 7 and a monitor 8, wherein the thermocouple 6 is connected with the monitor 8 through the wire 7; a plurality of thermocouples 6 of the temperature measuring device are placed in thermocouple mounting holes 3 of a welding boss 2 of a TC4 welding simulation part I1;
fourth, the method comprises the following steps: optimally designing the cross section shape of the welding joint according to the monitoring result; the monitoring result shows that: the temperature of the two end areas of the welding joint is obviously lower than that of the middle part of the welding joint, and the temperature difference is more than 100 ℃;
judging according to the monitoring result, when the TC4 welding simulation piece 1 and the TC17 welding simulation piece 4 are subjected to linear friction welding, the heat generation at two ends of the welding simulation piece is lower than that in the middle, and the shapes of the two ends of the welding simulation piece are required to be optimally designed; the optimization design process is as follows: the highest point of the blade profile 31 at the weld joint of the blisk in the vibration direction of the linear friction welding is taken as a point one 11, a line perpendicular to the vibration direction is made through the point one 11 as a line one 21, and two intersection points of the line one 21 and the blade profile 31 at the weld joint of the blisk are respectively a point two 12 and a point three 13; the highest point of the original section 32 of the welding joint along the vibration direction is taken as a point IV 14, a connecting line between a point II 12 and a point IV 14 is taken as a line II 22, and a connecting line between a point III 13 and a point IV 14 is taken as a line III 23; the furthest point between the outer edge line of the original section 32 of the welded joint between the point two 12 and the point four 14 and the line two 22 is taken as a point five 15, and the furthest point between the outer edge line of the original section 32 of the welded joint between the point three 13 and the point four 14 and the line three 23 is taken as a point six 16; making a line perpendicular to the vibration direction through the point IV 14 as a line IV 24, taking an intersection point of the lead wire of the point IV 15 along the vibration direction and the line IV 24 as a point seven 17, and taking an intersection point of the lead wire of the point VI 16 along the vibration direction and the line IV 24 as a point eight 18; point four 14 is offset 2mm outward in the vibration direction as point nine 19; the shape of the cross section 33 of the optimized welding joint is formed through smooth connecting lines among the second point 12, the seventh point 17, the ninth point 19, the eighth point 18 and the third point 13;
fifth step: processing a second TC4 welding simulation piece and a second TC17 welding simulation piece according to the optimized shape of the section 33 of the welding joint; processing welding bosses on a second TC4 welding simulation piece and a second TC17 welding simulation piece, wherein the height of the welding boss of the second TC4 welding simulation piece is larger than the welding axial shortening amount of TC4, and the height of the welding boss of the second TC17 welding simulation piece is larger than the welding axial shortening amount of TC 17; a plurality of thermocouple mounting holes are formed in the side face of the welding boss of the TC17 welding simulation piece II;
sixth,: performing linear friction welding on the second TC4 welding simulation piece and the second TC17 welding simulation piece, and monitoring heat in a welding process by using a temperature measuring device, wherein a plurality of thermocouples 6 of the temperature measuring device are arranged in thermocouple mounting holes of a welding boss of the second TC17 welding simulation piece; the monitoring result shows that: the temperature change of each end region of the optimized welding joint is kept within 100 ℃, so that the welding quality of linear friction welding can be ensured, and the welding technical requirements are met.
Claims (5)
1. A method for designing the shape of a welded joint of a titanium alloy linear friction welding of a blisk is characterized by comprising the following steps:
and (3) a step of: designing the original section shape of a welded joint according to the profile of a welding seam of the blisk;
and II: processing a TC4 welding simulation piece I and a TC17 welding simulation piece I according to the original cross-sectional shape of the welding joint;
thirdly,: performing linear friction welding on the TC4 welding simulation piece I and the TC17 welding simulation piece I, and monitoring heat in a welding process by using a temperature measuring device;
fourth, the method comprises the following steps: optimally designing the cross section shape of the welding joint according to the monitoring result;
fifth step: processing a second TC4 welding simulation piece and a second TC17 welding simulation piece according to the optimized cross section shape of the welding joint;
sixth,: and C4, performing linear friction welding on the second welding simulation piece and the second welding simulation piece TC17, and monitoring heat in the welding process by using a temperature measuring device so as to verify that the shape of the welded joint meets the welding technical requirement.
2. The method for designing the shape of a welded joint for integral She Pantai alloy linear friction welding according to claim 1, wherein said temperature measuring means comprises a thermocouple, a wire and a monitor, the thermocouple being connected to the monitor by the wire.
3. The method for designing the shape of the welded joint of the integral She Pantai alloy linear friction welding according to claim 2, wherein in the second and fifth steps, when the first, second and first TC4, second TC17 and second TC17 welding simulators are processed, welding bosses are processed, the heights of the welding bosses of the first and second TC4 welding simulators are larger than the welding axial shortening of TC4, and the heights of the welding bosses of the first and second TC17 welding simulators are larger than the welding axial shortening of TC 17; the side faces of the welding bosses of the TC4 welding simulation piece I and the TC4 welding simulation piece II are provided with a plurality of thermocouple installation holes, and a plurality of thermocouples of the temperature measuring device are placed in the thermocouple installation holes.
4. The method for designing the shape of the welded joint of the integral She Pantai alloy linear friction welding as claimed in claim 1, wherein in the first step, the profile of the welded joint of the blisk is uniformly increased by 3mm outwards to be used as the original cross-sectional shape of the welded joint.
5. The method for designing the shape of the welded joint of the integral She Pantai alloy linear friction welding according to claim 1, wherein in the fourth step, according to the monitoring result, when the first TC4 welding simulator and the first TC17 welding simulator perform linear friction welding, the heat generated at the two ends of the first TC4 welding simulator is lower than that of the middle part, and the shapes of the two ends of the first TC4 welding simulator and the first TC17 welding simulator need to be optimally designed; the optimization design process is as follows: the highest point of the blade profile at the weld joint of the blisk in the vibration direction of the linear friction welding is taken as a point I, a line perpendicular to the vibration direction is made through the point I as a line I, and two intersection points of the line I and the blade profile at the weld joint of the blisk are respectively a point II and a point III; the highest point of the original section of the welding joint along the vibration direction is taken as a point IV, a connecting line between the point II and the point IV is taken as a line II, and a connecting line between the point III and the point IV is taken as a line III; the furthest point between the outer edge line of the original section of the welded joint between the point two and the point four and the line two is taken as a point five, and the furthest point between the outer edge line of the original section of the welded joint between the point three and the point four and the line three is taken as a point six; making a line perpendicular to the vibration direction through the point IV as a line IV, taking the intersection point of the lead wire in the vibration direction and the line IV as a point seven, and taking the intersection point of the lead wire in the vibration direction and the line IV as a point eight; the fourth point is offset outwards by 2mm along the vibration direction to be regarded as a ninth point; and forming the optimized cross section shape of the welding joint through smooth connecting lines among the points II, seven, nine, eight and three.
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| CN117182288B (en) | 2024-01-05 |
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