A thin-wall stamping combustion chamber casing and its multi-weld bead deformation control method

Abstract

The present invention discloses a thin-walled stamping combustion chamber casing and a multi-weld bead deformation control method thereof, relating to the technical field of machining. A specific embodiment of the present invention includes: an outer casing, an exhaust cone, a working nozzle mounting seat, a starting nozzle mounting seat, a spark plug mounting seat, an air extraction mounting seat and an anti-surge mounting seat, wherein the outer casing is bell-shaped, the exhaust cone is conical, the exhaust cone is sleeved on the top of the outer casing and partially extends into the inner part of the outer casing, and the working nozzle mounting seat, the starting nozzle mounting seat, the spark plug mounting seat, the air extraction mounting seat and the anti-surge mounting seat are mounted on the side wall of the outer casing. The present invention realizes the welding of a casing with a complex structure and controls the deformation during the welding process.

Description

Technical Field

[0001] The present invention belongs to the technical field of machining, and particularly relates to a thin-wall stamping combustion chamber casing and a multi-weld bead deformation control method therefor. Background Art

[0002] The combustion chamber casing is an important component of an aeroengine. It is mostly made by thin-wall stamping. During the combined assembly welding process, the welding of multiple thin-wall single parts is involved. The structure of the casing parts is complex, involving multiple welding methods and multiple weld beads. There are three problems: First, since each single part is a thin-wall stamping part, the part deformation is large, and the welding deformation exceeds the standard due to the large assembly clearance of the components; second, there are many welding methods involved, such as spot welding, argon arc welding, vacuum brazing, etc., so the number of weld beads is also large, and the welding deformation situation is complex; third, the number of thin-wall single parts is large, the part structure is complex, the welding difficulty is high, and the cumulative deformation after welding is large. Summary of the Invention

[0003] The present invention provides a thin-wall stamping combustion chamber casing and a multi-weld bead deformation control method therefor, which can control the deformation of the casing while ensuring the welding quality of the casing.

[0004] In view of this, according to one aspect of an embodiment of the present invention, there is provided a thin-wall stamping combustion chamber casing, including: an outer casing 10, an exhaust cone 20, a working nozzle mounting seat 101, a starting nozzle mounting seat 102, a spark plug mounting seat 103, an air extraction mounting seat 104, and an anti-surge mounting seat 105. The outer casing 10 is bell-shaped, the exhaust cone 20 is conical, the exhaust cone 20 is sleeved on the top of the outer casing and partially extends into the inner part of the outer casing 10, and the working nozzle mounting seat 101, the starting nozzle mounting seat 102, the spark plug mounting seat 103, the air extraction mounting seat 104, and the anti-surge mounting seat 105 are mounted on the side wall of the outer casing 10.

[0005] According to another aspect of an embodiment of the present invention, there is provided a multi-weld bead deformation control method for a thin-wall stamping combustion chamber casing, including:

[0006] Step S01: Mount the outer casing 10 and the exhaust cone 20 on a spot welding fixture 1, and perform spot welding on the contact edge of the outer casing 10 and the exhaust cone 20. After completion, remove the spot welding fixture 1;

[0007] Step S02: Mount the outer casing 10 on an argon arc welding fixture 2, and use argon arc welding to weld the working nozzle mounting seat 101, the starting nozzle mounting seat 102, and the spark plug mounting seat 103 to the outer casing 10. After completion, remove the argon arc welding fixture 2;

[0008] Step S03: Install the outer casing 10 and the exhaust cone 20 on the vacuum brazing fixture 3, fix the bleed air mounting seat 104 and the anti-surge mounting seat 105 on the outer casing 10, use vacuum brazing to weld multiple weld seams of the combustion chamber casing, and then remove the vacuum brazing fixture 3.

[0009] Optionally, the spot welding fixture 1 further includes a spot welding fixture base 11 and a positioning support 12. The spot welding fixture base 11 is disc-shaped, the positioning support 12 is cylindrical and is arranged inside the spot welding fixture base 11. A first pull rod 121 and a first pressing plate 122 are further arranged on the upper part of the positioning support 12.

[0010] Optionally, step S01 further includes: Step 101: Fix the bottom of the outer casing 10 on the spot welding fixture base 11, sleeved the exhaust cone 20 outside the positioning support 12, sleeve the first pressing plate 122 from inside the exhaust cone 20 onto the first pull rod 121 and fix it, and connect and fix the contact edges of the outer casing 10 and the exhaust cone 20 with a first positioning pin 19;

[0011] Step S102: Spot weld the contact edges of the outer casing 10 and the exhaust cone 20;

[0012] Step S103: Remove the spot welding fixture 1 after spot welding.

[0013] Optionally, the TIG welding fixture 2 further includes a TIG welding fixture base 21, a TIG welding sub-fixture 22, a TIG welding outer support fixture 23 and a TIG welding inner support fixture 24. The TIG welding sub-fixture 22 further includes a first positioning block 211, a second pull rod 212, a stop block 223, a screw 224 and a nut 225. The first positioning block 211 and the stop block 223 can be sleeved and adapted. The second pull rod 212 can penetrate through the first positioning block 211 and the stop block 223 and is locked by the nut 225. The stop block 223 further includes a screw hole adapted to the screw 224, and the axial direction of the screw hole is parallel to the axial direction of the second pull rod 212. The TIG welding outer support fixture 23 and the TIG welding inner support fixture 24 are erected on the TIG welding fixture base 21. The upper end of the TIG welding outer support fixture 23 further includes a second positioning block 231 and a stepped screw 232, wherein the second positioning block 231 is provided with a stepped screw hole adapted to the stepped screw 232. The upper end of the TIG welding outer support fixture 23 further includes a positioning pin 233. One end of the second pull rod 212 located inside the outer casing 10 is connected to the upper end of the TIG welding inner support fixture 24.

[0014] Optionally, step S02 further includes: step S201: Install the bottom of the outer casing 10 in the argon arc welding fixture base 21, and fix it using the argon arc welding sub-fixture 22, the argon arc welding outer support fixture 23, and the argon arc welding inner support fixture 24. Among them, sleeve the first positioning block 211 outside the outer casing 10 on the working nozzle mounting seat 101, and sleeve it through the first mounting hole of the outer casing 10 with the stop block 223 located inside the outer casing 10. The second pull rod 212 passes through the first positioning block 211, the first mounting hole, and the stop block 223, and the nut 225 is locked from the outside of the outer casing 10. The screw 224 connects and locks the argon arc welding inner support fixture 24 and the stop block 223 from the inside of the outer casing 10, so that the working nozzle mounting seat 101 is close to the outside of the outer casing 10;

[0015] The second positioning block 231 sleeves the starting nozzle mounting seat 102, makes the starting nozzle mounting seat 102 close to the outside of the outer casing 10, and locks it using the stepped screw 232;

[0016] The positioning pin 233 sleeves the spark plug mounting seat 103 and is inserted into the second mounting hole of the outer casing 10 from the outside, so that the spark plug mounting seat 103 is close to the outer casing 10;

[0017] Step S202: Use argon arc welding to weld the working nozzle mounting seat 101, the starting nozzle mounting seat 102, and the spark plug mounting seat 103 to the outer casing 10;

[0018] Step S203: Remove the argon arc welding fixture 2 after welding is completed.

[0019] Optionally, the vacuum brazing fixture 3 further includes a first positioning disk 31, a second positioning disk 32, a brazing support fixture 33, and a brazing inner support. Among them, the second positioning disk 32 is sleeved in the middle of the first positioning disk 31. The upper end of the brazing support fixture 33 includes a first bent plate 331, a compression screw 332, a centering shaft 333, and a second pressing plate 334. It also includes a clamping plate 335, a second bent plate 336, and a second positioning pin 337;

[0020] The brazing inner support further includes a third pressing plate 341 and a third pull rod 342. The third pull rod 342 can pass through the third pressing plate 341, and the third pull rod 342 can be fixed to the second positioning disk 32.

[0021] Optionally, step S03 further includes: step S301: Install the bottom of the outer casing 10 on the first positioning disk 31, and install the bottom of the exhaust cone 20 on the second positioning disk 32;

[0022] Pass the centering shaft 333 through the first bent plate 331 and insert it into the port mounting edge of the air extraction mounting seat 104. Use the compression screw 332 to press the centering shaft 333 against the first bent plate 331. Then, use the second pressing plate 334 to press against the mounting edge of the port of the air extraction mounting seat 104. The second pressing plate 334 and the first bent plate 331 are locked by a screw rod to fix the air extraction mounting seat 104 on the first bent plate 331, so that the air extraction mounting seat 104 is pressed against the side wall of the outer casing 10;

[0023] Pass the second positioning pin 337 through the second bent plate 336 and insert it into the port mounting edge of the anti-surge mounting seat 105. Use the compression screw 332 to press the second positioning pin 337 against the second bent plate 336. Use the bolt 338 to press against the clamping plate 335 and pass through the second bent plate 336 to fix the anti-surge mounting seat 105 on the second bent plate 336, so that the anti-surge mounting seat 105 is pressed against the outer casing 10;

[0024] Set the third pressing plate 341 on the upper port of the exhaust cone 20. Fix one end of the third pull rod 342 to the second positioning disc 32, and pass the other end through the third pressing plate 341 and lock it;

[0025] Step S302: Apply brazing filler metal to the weld seams between the outer casing 10 and the exhaust cone 20, the working nozzle mounting seat 101, the starting nozzle mounting seat 102, the spark plug mounting seat 103, the air extraction mounting seat 104 and the anti-surge mounting seat 105, and place them in a vacuum brazing furnace for welding;

[0026] Step S303: After welding, eliminate stress and cool down, and then remove the vacuum brazing fixture 3.

[0027] Optionally, step S102 further includes: setting the current intensity to 4 - 5 kA, the welding time to 8 - 12 cycles, the welding pressure to 4.5 - 5.5 kN, the pre-extrusion time to 35 - 45 cycles, the extrusion time to 25 - 35 cycles, the holding time to 5 - 15 cycles, and placing the area to be welded between the electrodes for welding.

[0028] Optionally, step S202 further includes: installing a tungsten electrode made of WCe20 with a diameter of φ1.5 - 2.0 mm on the argon arc welding torch, setting the welding current intensity to 30 - 50 A, the welding voltage to 10 - 16 V, the argon gas flow rate to 8 - 10 L / min, the current polarity to direct current straight polarity, the wire diameter to φ1.0 - 1.5 mm, the welding sequence to be alternately symmetric, and avoiding stress concentration areas for the starting and ending arc positions.

[0029] Optionally, step S302 further includes: setting the heating rate to 5 - 10 °C / min, the brazing temperature to 1030 - 1060 °C, and the holding time to 5 - 15 min.

[0030] The technical key of the present invention is to adopt a full - process combustion chamber casing welding processing deformation control scheme from welding assembly to post - weld heat treatment to improve the multi - bead deformation of the thin - wall stamping casing. Compared with other local processing flow control schemes, it effectively solves the problem of large cumulative deformation in each processing link and multiple welding processes of the thin - wall stamping casing.

[0031] The deformation of the thin - wall stamping casing during multi - bead welding of different welding methods is restricted by welding fixtures, and reasonable welding parameters can further ensure that the welding deformation is within the specified tolerance range. Post - weld heat treatment can effectively eliminate welding residual stress. Selecting appropriate holding temperature, holding time, and cooling method can ensure that the casing eliminates residual stress with a controllable deformation amount. By integrating the above - mentioned full - process welding processing deformation limiting means, the multi - bead deformation amount of the thin - wall stamping casing is effectively controlled. Brief Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of a thin - wall stamping combustion chamber casing according to an embodiment of the present invention;

[0033] Figure 2 It is a schematic structural diagram of a spot - welding fixture for a multi - bead deformation control method of a thin - wall stamping combustion chamber casing according to an embodiment of the present invention;

[0034] Figure 3 It is a schematic assembly external view of step S101 of a spot - welding fixture for a multi - bead deformation control method of a thin - wall stamping combustion chamber casing according to an embodiment of the present invention;

[0035] Figure 4 It is a schematic assembly internal structure diagram of step S101 of a spot - welding fixture for a multi - bead deformation control method of a thin - wall stamping combustion chamber casing according to an embodiment of the present invention;

[0036] Figure 5 It is a schematic assembly external view of step S201 of a spot - welding fixture for a multi - bead deformation control method of a thin - wall stamping combustion chamber casing according to an embodiment of the present invention;

[0037] Figures 6 - 8 It is a schematic assembly internal structure diagram of step S201 of a spot - welding fixture for a multi - bead deformation control method of a thin - wall stamping combustion chamber casing according to an embodiment of the present invention;

[0038] Figures 9 - 10Schematic diagram of the internal structure of the spot welding fixture for step S301 of the multi-pass welding deformation control method of a thin-walled stamping combustion chamber casing according to an embodiment of the present invention;

[0039] Figure 11 Schematic diagram of the external appearance of the assembly of the spot welding fixture for step S301 of the multi-pass welding deformation control method of a thin-walled stamping combustion chamber casing according to an embodiment of the present invention;

[0040] Explanation of reference numerals:

[0041] 10 - Outer casing, 20 - Exhaust cone, 1 - Spot welding fixture, 2 - TIG welding fixture, 3 - Vacuum brazing fixture, 101 - Working nozzle mounting seat, 102 - Starting nozzle mounting seat, 103 - Spark plug mounting seat, 104 - Bleed air mounting seat, 105 - Anti-surge mounting seat, 10 - Outer casing, 11 - Spot welding fixture base, 12 - Fixed support, 111 - Tightening screw, 121 - First pull rod, 122 - First pressing plate, 123 - Tightening nut, 20 - Exhaust cone, 19 - First positioning pin, 21 - TIG welding fixture base, 22 - TIG welding sub-fixture, 23 - TIG welding outer support fixture, 24 - TIG welding inner support fixture, 191 - Pin body, 192 - Gasket, 193 - Positioning nut, 211 - First positioning block, 212 - Second pull rod, 223 - Stop block, 224 - Screw, 225 - Nut, 231 - Second positioning block, 232 - Step screw, 233 - Positioning pin, 31 - First positioning disc, 32 - Second positioning disc, 33 - Brazing support fixture, 331 - First bent plate, 332 - Compression screw, 333 - Centering shaft, 334 - Second pressing plate, 335 - Clamping plate, 336 - Second bent plate, 337 - Second positioning pin, 338 - Bolt, 341 - Third pressing plate, 342 - Third pull rod, A - Weld seam. Detailed implementation manners

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] Figure 1 Schematic diagram of the structure of a thin-walled stamping combustion chamber casing according to an embodiment of the present invention, as Figure 1As shown in the figure, a thin-walled stamping combustion chamber casing provided by an embodiment of the present invention includes: an outer casing 10, an exhaust cone 20, a working nozzle mounting seat 101, a starting nozzle mounting seat 102, a spark plug mounting seat 103, an air extraction mounting seat 104, and an anti-surge mounting seat 105. The outer casing 10 is bell-shaped, the exhaust cone 20 is conical, the exhaust cone 20 is sleeved on the top of the outer casing and partially extends into the inner part of the outer casing 10, and the working nozzle mounting seat 101, the starting nozzle mounting seat 102, the spark plug mounting seat 103, the air extraction mounting seat 104, and the anti-surge mounting seat 105 are installed on the side wall of the outer casing 10.

[0044] A multi-pass welding deformation control method for a thin-walled stamping combustion chamber casing provided by another embodiment of the present invention includes: Step S01: Install the outer casing 10 and the exhaust cone 20 on the spot welding fixture 1, use spot welding to weld the contact edges of the outer casing 10 and the exhaust cone 20, and remove the spot welding fixture 1 after completion; use spot welding to first simply fix the relatively large-volume exhaust cone 20.

[0045] Step S02: Install the outer casing 10 on the argon arc welding fixture 2, use argon arc welding to weld the working nozzle mounting seat 101, the starting nozzle mounting seat 102, and the spark plug mounting seat 103 to the outer casing 10, and remove the argon arc welding fixture 2 after completion;

[0046] Step S03: Install the outer casing 10 and the exhaust cone 20 on the vacuum brazing fixture 3, fix the air extraction mounting seat 104 and the anti-surge mounting seat 105 to the outer casing 10, use vacuum brazing to weld multiple welds of the combustion chamber casing, and remove the vacuum brazing fixture 3.

[0047] The exhaust cone 20 and various mounting seats are welded to the outer casing 10 by welding in batches. Different special fixtures are used for each welding, reducing the single-welding error, controlling the deformation of the casing parts during welding, improving the welding quality, and finally completing the casing processing by overall vacuum brazing.

[0048] Specifically, Figure 2 FIG. is a schematic structural diagram of a spot welding fixture for a multi-pass welding deformation control method of a thin-walled stamping combustion chamber casing according to an embodiment of the present invention. As Figure 2 shown, the spot welding fixture 1 further includes a spot welding fixture base 11 and a positioning support 12. The spot welding fixture base 11 is disc-shaped, the positioning support 12 is cylindrical and is arranged inside the spot welding fixture base 11, and a first pull rod 121 and a first pressing plate 122 are further arranged on the upper part of the positioning support 12. The spot welding fixture base 11 is used to fix the outer casing 10, and the positioning support 12 is used to fix the exhaust cone 20, facilitating welding and controlling the position accuracy.

[0049] Figure 3Schematic diagram of the assembly appearance of the spot welding fixture for step S101 of a multi-pass deformation control method for a thin-walled stamping combustion chamber casing according to an embodiment of the present invention Figure 4 Schematic diagram of the internal structure of the assembly of the spot welding fixture for step S101 of a multi-pass deformation control method for a thin-walled stamping combustion chamber casing according to an embodiment of the present invention, as Figure 3 and Figure 4 shown. Step S01 further includes:

[0050] Step 101: The bottom of the outer casing 10 can be fixed to the spot welding fixture base 11 by tightening the screw 111. The exhaust cone 20 is sleeved outside the positioning support 12. The first pressing plate 122 is sleeved from inside the exhaust cone 20 onto the first pull rod 121 and can be fixed by tightening the nut 123. The contact edge between the outer casing 10 and the exhaust cone 20 is connected and fixed using the first positioning pin 19. Further, by adjusting the spot welding fixture base 11, the positioning support 12, and the first pressing plate 122, the height difference between the outer casing 10 and the exhaust cone 20 is controlled to be 117.35 - 117.85 mm. Among them, the contact edge between the outer casing 10 and the exhaust cone 20 has a positioning hole for inserting the first positioning pin 19. The first positioning pin 19 includes a pin body 191, a gasket 192, and a positioning nut 193. After the first positioning pin 19 is inserted, it can be locked by the positioning nut 193.

[0051] Step S102: Spot weld the contact edge (A) between the outer casing 10 and the exhaust cone 20. Further, set the current intensity to 4 - 5 kA, the welding time to 8 - 12 cycles, the welding pressure to 4.5 - 5.5 kN, the pre-extrusion time to 35 - 45 cycles, the extrusion time to 25 - 35 cycles, and the holding time to 5 - 15 cycles, and place the area to be welded (A) between the electrodes for welding.

[0052] Step S103: Remove the spot welding fixture 1 after spot welding.

[0053] Further, the spot welding fixture base 11, the positioning support 12, the first pressing plate 122, and the first positioning pin 19 can be made of 7075 - T6 aluminum alloy, which can ensure the strength of the fixture and is easy for fixture processing.

[0054] Specifically, Figure 5 Schematic diagram of the assembly appearance of the spot welding fixture for step S201 of a multi-pass deformation control method for a thin-walled stamping combustion chamber casing according to an embodiment of the present invention; Figures 6 - 8 Schematic diagram of the internal structure of the assembly of the spot welding fixture for step S201 of a multi-pass deformation control method for a thin-walled stamping combustion chamber casing according to an embodiment of the present invention; as Figures 5 - 8As shown, the TIG welding fixture 2 further includes a TIG welding fixture base 21, a TIG welding sub-fixture 22, a TIG welding outer support fixture 23 and a TIG welding inner support fixture 24. The TIG welding sub-fixture 22 further includes a first positioning block 211, a second pull rod 212, a stop block 223, a screw 224 and a nut 225. The first positioning block 211 and the stop block 223 can be sleeved and adapted. The second pull rod 212 can pass through the first positioning block 211 and the stop block 223 and be locked by the nut 225. The stop block 223 further includes a screw hole adapted to the screw 224, and the axial direction of the screw hole is parallel to the axial direction of the second pull rod 212. The TIG welding outer support fixture 23 and the TIG welding inner support fixture 24 are erected on the TIG welding fixture base 21. The upper end of the TIG welding outer support fixture 23 further includes a second positioning block 231 and a stepped screw 232, wherein the second positioning block 231 is provided with a stepped screw hole adapted to the stepped screw 232. The upper end of the TIG welding outer support fixture 23 further includes a positioning pin 233. One end of the second pull rod 212 located inside the outer casing 10 is connected to the upper end of the TIG welding inner support fixture 24.

[0055] Step S02 further includes:

[0056] Step S201: Install the bottom of the outer casing 10 in the TIG welding fixture base 21 and fix it using the TIG welding sub-fixture 22, the TIG welding outer support fixture 23 and the TIG welding inner support fixture 24. Among them, sleeved the first positioning block 211 outside the outer casing 10 on the working nozzle mounting seat 101, and sleeve it with the stop block 223 located inside the outer casing 10 through the first mounting hole of the outer casing 10. The second pull rod 212 passes through the first positioning block 211, the first mounting hole and the stop block 223, and the nut 225 is locked from the outside of the outer casing 10. The screw 224 connects and locks the TIG welding inner support fixture 24 and the stop block 223 from the inside of the outer casing 10, so that the working nozzle mounting seat 101 is close to the outside of the outer casing 10;

[0057] The second positioning block 231 is sleeved on the starting nozzle mounting seat 102, the starting nozzle mounting seat 102 is close to the outer casing 10 on the outside, and it is locked using the stepped screw 232. The stepped screw hole is used to control the stroke of the stepped screw 232 and is conducive to installation positioning.

[0058] The positioning pin 233 is sleeved on the spark plug mounting seat 103 and is inserted into the second mounting hole of the outer casing 10 from the outside, so that the spark plug mounting seat 103 is close to the outer casing 10;

[0059] Further, the position degree of the working nozzle mounting seat 101 relative to the side wall of the outer casing 10 is controlled to be less than 0.2 by using the first positioning block 211, the second pull rod 212, the stop block 223, the screw 224 and the nut 225; the position degree of the starting nozzle mounting seat 102 relative to the side wall of the outer casing 10 is controlled to be less than 0.2 by using the second positioning block 231 and the stepped screw 232, and the position degree of the spark plug mounting seat 103 relative to the side wall of the outer casing 10 is controlled to be less than 0.2 by using the positioning pin 233. According to various different fixture structures, the installation errors of each installation nozzle are controlled, the welding precision of the whole casing is improved, and the welding deformation is controlled.

[0060] Step S202: Weld the working nozzle mounting seat 101, the starting nozzle mounting seat 102 and the spark plug mounting seat 103 to the outer casing 10 by using argon arc welding. Further, a tungsten electrode with a material of WCe20 and a diameter of φ1.5 - 2.0 mm is installed on the argon arc welding torch, the welding current intensity is set to 30 - 50 A, the welding voltage is 10 - 16 V, the argon gas flow rate is 8 - 10 L / min, the current polarity is direct current straight polarity, the wire diameter of the welding wire is φ1.0 - 1.5 mm, the welding sequence is alternately symmetric, and the starting and ending arc positions avoid stress concentration areas. Selecting the above argon arc welding parameters can achieve good welding effects.

[0061] Step S203: Remove the argon arc welding fixture 2 after welding is completed.

[0062] Specifically, Figures 9 - 10 It is a schematic diagram of the internal structure of the assembly of step S301 of the spot welding fixture for a multi-pass welding deformation control method of a thin-wall stamping combustion chamber casing according to an embodiment of the present invention. Figure 11 It is a schematic diagram of the external appearance of the assembly of step S301 of the spot welding fixture for a multi-pass welding deformation control method of a thin-wall stamping combustion chamber casing according to an embodiment of the present invention, as Figures 9 - 11 shown. The vacuum brazing fixture 3 further includes a first positioning disk 31, a second positioning disk 32, a brazing support fixture 33 and a brazing inner support. Among them, the second positioning disk 32 is sleeved in the middle of the first positioning disk 31. The upper end of the brazing support fixture 33 includes a first bent plate 331, a pressing screw 332, a centering shaft 333 and a second pressing plate 334, and also includes a clamping plate 335, a second bent plate 336 and a second positioning pin 337; the brazing inner support further includes a third pressing plate 341 and a third pull rod 342. The third pull rod 342 can pass through the third pressing plate 341, and the third pull rod 342 can be fixed to the second positioning disk 32.

[0063] Step S03 further includes:

[0064] Step S301: Install the bottom of the outer casing 10 on the first positioning disk 31, and install the bottom of the exhaust cone 20 on the second positioning disk 32;

[0065] Pass the centering shaft 333 through the first bent plate 331 and insert it into the port mounting edge of the air extraction mounting seat 104. Use the compression screw 332 to press the centering shaft 333 against the first bent plate 331. Then, use the second pressing plate 334 to press against the mounting edge of the port of the air extraction mounting seat 104. The second pressing plate 334 and the first bent plate 331 are locked by a screw rod to fix the air extraction mounting seat 104 on the first bent plate 331, so that the air extraction mounting seat 104 is pressed against the side wall of the outer casing 10. Further, use the first bent plate 331, the compression screw 332, the centering shaft 3333 and the second pressing plate 334 to control the position degree of the air extraction installation to be less than 0.5 mm.

[0066] Pass the second positioning pin 337 through the second bent plate 336 and insert it into the port mounting edge of the anti-surge mounting seat 105. Use the compression screw 332 to press the second positioning pin 337 against the second bent plate 336. Use the bolt 338 to press against the clamping plate 335 and pass through the second bent plate 336 to fix the anti-surge mounting seat 105 on the second bent plate 336, so that the anti-surge mounting seat 105 is pressed against the outer casing 10. Further, use the clamping plate 335, the second bent plate 336 and the second positioning pin 337 to control the position degree of the anti-surge mounting seat 105 to be less than 0.5 mm.

[0067] Set the third pressing plate 341 on the upper port of the exhaust cone 20. Fix one end of the third pull rod 342 to the second positioning disk 32, and pass the other end through the third pressing plate 341 and lock it by tightening the nut 123. Further, use the first positioning disk 31 to control the diameter of the mounting edge of the outer casing 10 to be 416.575 - 416.95 mm, and use the second positioning disk 32 to control the runout of the exhaust cone 20 to be less than 0.35 mm.

[0068] Step S302: Apply brazing filler metal to the welds between the outer casing 10 and the exhaust cone 20, the working nozzle mounting seat 101, the starting nozzle mounting seat 102, the spark plug mounting seat 103, the air extraction mounting seat 104 and the anti-surge mounting seat 105, and place them in a vacuum brazing furnace for welding. Further, the heating rate is 5 - 10 °C / min, the brazing temperature is 1030 - 1060 °C, and the holding time is 5 - 15 min.

[0069] Step S303: After welding, eliminate stress and cool down, and remove the vacuum brazing fixture 3. Further, the cooling method is furnace cooling and argon filling cooling. The hot vacuum degree is less than 4×10-5 Torr, and the cold vacuum degree is less than 3×10-5 Torr; the stress relief holding temperature is 490 - 510 °C, the holding time is 120 - 150 min, and the cooling method is selected as argon filling cooling.

[0070] Further, the sequence of some of the steps S01 to S03 provided by the invention can also be adjusted. For example, the air extraction mounting seat 104 and the anti-surge mounting seat 105 can be first fixed to the outer casing (10).

[0071] The technical key of the present invention is to adopt a full-process combustion chamber casing welding processing deformation control scheme from welding assembly to post-weld heat treatment to improve the multi-pass welding deformation of the thin-walled stamping casing. Compared with other local processing flow control schemes, it effectively solves the problem of large cumulative deformation of the thin-walled stamping casing in each processing link and multi-pass welding process.

[0072] The deformation of the thin-walled stamping casing during multi-pass welding of different welding methods is restricted by welding jigs, and reasonable welding parameters can further ensure that the welding deformation is within the specified tolerance range. Post-weld heat treatment can effectively eliminate welding residual stress. Selecting appropriate holding temperature, holding time and cooling method can ensure that the casing eliminates residual stress with controllable deformation. By integrating the above full-process welding processing deformation limiting means, the multi-pass welding deformation of the thin-walled stamping casing can be effectively controlled.

[0073] The above are only specific embodiments of the present invention. The present invention is described in detail, and the unelaborated parts are conventional technologies. However, the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A multi-pass welding deformation control method for a thin-walled stamping combustion chamber casing, characterized in that, The casing includes: An outer casing (10), an exhaust cone (20), a working nozzle mounting seat (101), a starting nozzle mounting seat (102), a spark plug mounting seat (103), an air extraction mounting seat (104), and an anti-surge mounting seat (105), wherein the outer casing (10) is bell-shaped, the exhaust cone (20) is conical, the exhaust cone (20) is sleeved on the top of the outer casing and partially extends into the interior of the outer casing (10), and the working nozzle mounting seat (101), the starting nozzle mounting seat (102), the spark plug mounting seat (103), the air extraction mounting seat (104), and the anti-surge mounting seat (105) are mounted on the side wall of the outer casing (10); Step S01: Mount the outer casing (10) and the exhaust cone (20) on a spot welding fixture (1), and use spot welding to weld the contact edges of the outer casing (10) and the exhaust cone (20). After completion, remove the spot welding fixture (1); Step S02: Mount the outer casing (10) on a TIG welding fixture (2), and use TIG welding to weld the working nozzle mounting seat (101), the starting nozzle mounting seat (102), and the spark plug mounting seat (103) to the outer casing (10). After completion, remove the TIG welding fixture (2); Step S03: Mount the outer casing (10) and the exhaust cone (20) on a vacuum brazing fixture (3), fix the air extraction mounting seat (104) and the anti-surge mounting seat (105) to the outer casing (10), use vacuum brazing to weld multiple weld seams of the combustion chamber casing, and remove the vacuum brazing fixture (3); The argon arc welding fixture (2) further includes an argon arc welding fixture base (21), an argon arc welding sub-fixture (22), an argon arc welding outer support fixture (23), and an argon arc welding inner support fixture (24). The argon arc welding sub-fixture (22) further includes a first positioning block (211), a second pull rod (212), a stop block (223), a screw (224), and a nut (225). The first positioning block (211) and the stop block (223) can be sleeved and adapted. The second pull rod (212) can penetrate through the first positioning block (211) and the stop block (223) and is locked by the nut (225). The stop block (223) further includes a threaded hole adapted to the screw (224), and the axial direction of the threaded hole is parallel to the axial direction of the second pull rod (212). The argon arc welding outer support fixture (23) and the argon arc welding inner support fixture (24) are erected on the argon arc welding fixture base (21). The upper end of the argon arc welding outer support fixture (23) further includes a second positioning block (231) and a stepped screw (232), wherein the second positioning block (231) is provided with a stepped threaded hole adapted to the stepped screw (232). The upper end of the argon arc welding outer support fixture (23) further includes a positioning pin (233). One end of the second pull rod (212) located inside the outer casing (10) is connected to the upper end of the argon arc welding inner support fixture (24). Among them, the spot welding fixture (1) further includes a spot welding fixture base (11) and a positioning support (12). The spot welding fixture base (11) is in a disc shape, and the positioning support (12) is in a cylindrical shape and is arranged inside the spot welding fixture base (11). The upper part of the positioning support (12) is further provided with a first pull rod (121) and a first pressing plate (122). The vacuum brazing fixture (3) further includes a first positioning disc (31), a second positioning disc (32), a brazing support fixture (33), and a brazing inner support. Among them, the second positioning disc (32) is sleeved in the middle of the first positioning disc (31). The upper end of the brazing support fixture (33) includes a first bent plate (331), a pressing screw (332), a centering shaft (333), and a second pressing plate (334), and further includes a clamping plate (335), a second bent plate (336), and a second positioning pin (337). The brazing inner support further includes a third pressing plate (341) and a third pull rod (342). The third pull rod (342) can penetrate through the third pressing plate (341), and the third pull rod (342) can be fixed to the second positioning disc (32).

2. The method according to claim 1, characterized in that, Step S01 further includes: Step 101: Fix the bottom of the outer casing (10) to the spot welding fixture base (11), sleeved the exhaust cone (20) outside the positioning support (12), sleeve the first pressing plate (122) from inside the exhaust cone (20) onto the first pull rod (121) and fix it, and connect and fix the contact edge between the outer casing (10) and the exhaust cone (20) with a first positioning pin (19). Step S102: Spot-weld the contact edges of the outer casing (10) and the exhaust cone (20). Step S103: Remove the spot-welding fixture (1) after spot-welding.

3. The method according to claim 1, wherein Step S02 further includes: Step S201: Install the bottom of the outer casing (10) in the TIG welding fixture base (21), and use the TIG welding sub-fixture (22), the TIG welding outer support fixture (23), and the TIG welding inner support fixture (24) for fixation. Among them, sleeved the first positioning block (211) outside the outer casing (10) on the working nozzle mounting seat (101), and sleeved through the first mounting hole of the outer casing (10) with the stopper (223) located inside the outer casing (10). The second pull rod (212) penetrates through the first positioning block (211), the first mounting hole, and the stopper (223), and the nut (225) is tightened from the outside of the outer casing (10). The screw (224) connects and tightens the TIG welding inner support fixture (24) and the stopper (223) from the inside of the outer casing (10), so that the working nozzle mounting seat (101) is closely attached to the outside of the outer casing (10). The second positioning block (231) is sleeved on the starting nozzle mounting seat (102), the starting nozzle mounting seat (102) is closely attached to the outside of the outer casing (10), and is tightened with the stepped screw (232). The positioning pin (233) is sleeved on the spark plug mounting seat (103), and is inserted into the second mounting hole of the outer casing (10) from the outside, so that the spark plug mounting seat (103) is closely attached to the outer casing (10). Step S202: Use TIG welding to weld the working nozzle mounting seat (101), the starting nozzle mounting seat (102), and the spark plug mounting seat (103) to the outer casing (10). Step S203: Remove the TIG welding fixture (2) after welding is completed.

4. The method according to claim 1, wherein Step S03 further includes: Step S301: Install the bottom of the outer casing (10) on the first positioning disk (31), and install the bottom of the exhaust cone (20) on the second positioning disk (32). Pass the centering shaft (333) through the first bent plate (331) and insert it into the port mounting edge of the air extraction mounting seat (104). Use the pressing screw (332) to press the centering shaft (333) on the first bent plate (331). Then use the second pressing plate (334) to press on the mounting edge of the port of the air extraction mounting seat (104). The second pressing plate (334) and the first bent plate (331) are locked by a screw rod to fix the air extraction mounting seat (104) on the first bent plate (331), so that the air extraction mounting seat (104) is pressed against the side wall of the outer casing (10). Pass the second positioning pin (337) through the second bent plate (336) and insert it into the mounting edge of the port of the anti-surge mounting base (105). Use the pressing screw (332) to press the second positioning pin (337) against the second bent plate (336). Use the bolt (338) to press the clamping plate (335) and pass through the second bent plate (336) to fix the anti-surge mounting base (105) on the second bent plate (336), so that the anti-surge mounting base (105) is pressed against the outer casing (10). Set the third pressing plate (341) on the upper port of the exhaust cone (20). Fix one end of the third pull rod (342) to the second positioning disc (32), and pass the other end through the third pressing plate (341) and lock it. Step S302: Apply brazing filler metal to the welds between the outer casing (10) and the exhaust cone (20), the working nozzle mounting base (101), the starting nozzle mounting base (102), the spark plug mounting base (103), the bleed air mounting base (104) and the anti-surge mounting base (105), and place them in a vacuum brazing furnace for welding. Step S303: After welding is completed, relieve stress and cool down, and remove the vacuum brazing fixture (3).

5. The method according to claim 2, characterized in that Step S102 further includes: Set the current intensity to 4 - 5 kA, the welding time to 8 - 12 cycles, the welding pressure to 4.5 - 5.5 kN, the pre-extrusion time to 35 - 45 cycles, the extrusion time to 25 - 35 cycles, and the holding time to 5 - 15 cycles, and place the area to be welded between the electrodes for welding.

6. The method according to claim 3, characterized in that Step S202 further includes: Install a tungsten electrode made of WCe20 with a diameter of φ1.5 - 2.0 mm on the TIG welding torch. Set the welding current intensity to 30 - 50 A, the welding voltage to 10 - 16 V, the argon gas flow rate to 8 - 10 L / min, the current polarity to DC straight polarity, the wire diameter to φ1.0 - 1.5 mm, the welding sequence to alternate symmetrically, and avoid stress concentration areas at the starting and ending arc positions.

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