Processing method of three-dimensional space complex cross flame tube with flange

Abstract

The invention discloses a processing method of a three-dimensional space complex cross flame tube with a flange. The processing method comprises the following steps in sequence: preparing a blank tube material, cutting an oblique angle, flanging for the first time, carrying out heat treatment, flanging for the second time, carrying out heat treatment, correcting a flanging, cutting a straight end surface, forming a bent tube surface of the cross flame tube, turning the flanging to obtain the outer diameter of the flange and turning the straight end surface. In the machining process, a female die of a sectioning rigid structure is matched with a male die made of urea alkane for forming, the size precision of the molded surface of the part is guaranteed, the appearance precision of the part is guaranteed by adjusting cutting parameters, and the final appearance size of the cross flame tube is obtained through turning. The machining cost of the flange three-dimensional space complex cross flame tube and similar structural parts is reduced, the machining period is shortened, the machining efficiency is improved, and the part quality and the percent of pass are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft engine processing, and in particular relates to a processing method for an aircraft engine cross-fire tube. Background Art

[0002] like Figure 1 The cross-fire tube shown is a hot end component of an aircraft engine. It is a thin-walled elbow adapter with a flange, similar to an elbow adapter. The angle is α°, and the outlet size of the two ends of the tube is ΦD +0 0 .56 , the flanging is a flange flanging of Φd1 with the center of the back of the "bend tube" as the center of the circle. The flange has an angle of α1° with the plane perpendicular to the axis of the flame tube. The part surface is complex, and one weld is allowed along the generatrix. The material thickness is 1.5mm, and the flanging is allowed to be locally thinned to 1.08mm. The part material is GH3044. The sheet material is wrinkled after welding. The traditional rigid mold cannot achieve the bending of the tube material. If it is welded after forming, it is difficult to grind the weld and correct the welding deformation. Because the part is a smooth transition curve, the shape can be greatly moved during processing, which makes it difficult to achieve the consistency of the part's shape processing surface, the consistency of the overall flanging, and the difficulty of part surface detection. A series of problems, ultimately lead to high processing costs, long processing cycles, low processing efficiency, poor quality and pass rate of parts. Based on the above problems, it is urgent to develop a reasonable and feasible processing method to process similar parts. Summary of the invention

[0003] In view of the problems described in the background technology, the present invention aims to provide a method for processing a three-dimensional complex cross-flame tube with a flange, so as to reduce processing costs, shorten processing cycles, improve efficiency, and improve part quality and pass rate.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for processing a three-dimensional complex cross-fire tube with a flange, comprising the following steps:

[0006] Step 1: Prepare a blank tube material. The blank tube material is processed from a rectangular plate material, and is bent, pipe-made, welded and heat-treated in sequence using a tube-making die, and finally the rectangular plate material is prepared into a straight blank tube material;

[0007] Step 2: Bevel cutting: bevel one axial straight end face of the blank tube and use it as the flange position;

[0008] Step 3: The first flanging is performed by positioning the other axial straight end face of the blank tube material, and flanging is performed on the beveled end face after the bevel treatment in step 2. No cracks are allowed to form on the flanging edge.

[0009] Step 4: Heat treatment to remove the stress caused by flanging;

[0010] Step 5: The second flanging is to continue to increase the flanging angle based on the first flanging of the bevel end surface in step 3. No cracks are allowed on the flanging edge.

[0011] Step 6: Heat treatment to remove the stress caused by flanging;

[0012] Step 7: Correction: Correct the profile of the flange so that the profile of the flange meets the requirements of the flange in the drawing;

[0013] Step 8: Cutting: Cut the straight end surface used for positioning in step 3 to ensure the angle α between the flange and the straight end surface in the drawing;

[0014] Step 9: forming, forming the curved tube profile in the cross-fire tube on the straight-line blank tube material, ensuring that the inner cavity diameter of the blank tube material after forming is equal to the inner diameter ΦD of the cross-fire tube;

[0015] Step 10: Turn the outer diameter of the flange to make it equal to the outer diameter of the flange;

[0016] Step 11: Turn the straight end surface cut in step 8.

[0017] further,

[0018] In the step 1, the length of the blank tube material is the longest axial dimension of the cross-fire tube after being straightened and unfolded along the axis plus a margin, and the diameter is smaller than the aperture of the cross-fire tube. The blank tube material is unfolded into a rectangular plate material through the neutral layer, and the plate material is cut by a shearing machine to ensure that the plate material is at right angles on all sides;

[0019] In the step 1, after the sheet is welded by argon arc welding, the roundness is corrected and heat treatment is performed to remove welding stress.

[0020] further,

[0021] In the step 2, a grinding wheel cutter is used to take the weld of the blank tube material in step 1 as the highest point of cutting to perform bevel cutting;

[0022] In step 2, the burrs generated by the cutting are removed after the bevel cutting, and the highest point and the lowest point of the cutting are rounded and polished within a certain distance offset to the left and right.

[0023] further,

[0024] In the step 3, before the first flanging, varnish is sprayed on the inner and outer surfaces of the blank tube material for lubrication, and the equipment for the first flanging is a hydraulic press;

[0025] The heat treatment in step 4 is solution treatment;

[0026] In the step 5, before the second flanging, varnish is sprayed on the inner and outer surfaces of the blank tube for lubrication. The equipment for the first flanging is a hydraulic press, which uses the straight end surface of the blank tube for positioning and the inner wall of the blank tube as support;

[0027] The heat treatment in step 6 is solution treatment.

[0028] further,

[0029] In step 7, varnish is sprayed on the inner and outer surfaces of the blank tube for lubrication, and the correction equipment is a hydraulic press, which uses the straight end surface of the blank tube for positioning, and the inner wall of the blank tube as support to flatten the flange, and at the same time correct the flange profile to be consistent with the cross-fire tube flange profile;

[0030] In step 7, there is a score line at the molding high point of the correction mold, and when the blank tube material is corrected, the weld is aligned with the score line of the correction mold;

[0031] In step 7, the angle after flanging correction is smaller than the final included angle α1.

[0032] further,

[0033] In step 8, cutting is performed using a cutting fixture with engraved lines on it, the flange is used as support, the weld is aligned with the engraved lines on the cutting fixture, and a grinding wheel is used to cut the straight end face of the blank tube material to ensure that the angle α between the flange and the straight end face is maintained;

[0034] In step 8, after cutting is completed, burrs around the blank tube are removed.

[0035] further,

[0036] In step 9, the forming equipment is a hydraulic press, the blank pipe material is placed in the forming mold, and the weld is aligned with the engraved line on the forming mold;

[0037] In the step 9, the convex mold of the forming mold is made of cylindrical urethane, the diameter of the cylindrical urethane can be smoothly loaded into the inner cavity of the blank tube material, and the length is greater than the total length of the blank tube material. The concave mold of the forming mold is a split-flap rigid mold, and the convex mold is extruded by the downward extrusion of the equipment, and the convex mold extrudes the inner wall of the blank tube material, so that the outer wall of the blank tube material fits the concave mold to realize the overall profile of the cross-flame tube;

[0038] In step 9, after forming, a line is drawn on the flange along the parting surface of the concave mold of the forming mold, which serves as a reference line for subsequent flange shape processing;

[0039] In step 9, after forming, the flatness of the flange is ensured while ensuring that the steel ball with an outer diameter of ΦD passes smoothly through the inner cavity of the blank tube.

[0040] further,

[0041] In step 10, when turning the outer diameter of the flange, the inner end face of the flange is supported, positioned with the inner cavity profile of the blank tube material, the outer end face of the flange is pressed, and then the circumferential surface of the flange is turned to obtain the flange outer diameter, and the burrs on the edge of the flange are removed.

[0042] further,

[0043] In the step 11, when turning the straight end face, the inner end face of the flange is pressed, positioned and clamped according to the shape of the blank tube material, and the straight end face of the blank tube material is turned;

[0044] In the step 11, after the straight end face is turned, it is inspected by using the cross-flame tube in working state, respectively pressing the flange end face and the straight end face, and inspecting the outer diameter of the flange and the angle between the flange and the straight end face.

[0045] Compared with the prior art, the present invention proposes a method for processing aero-engine cross-fire tubes, which first processes the flanging to obtain the basic shape of the flange, then cuts the straight end face to obtain the required angle between the flange and the straight end face, and then shapes the curved profile of the cross-fire tube. Finally, the flanging and the straight end face are turned separately to reach the final size. During the forming process of the curved profile, the dimensional accuracy of the part profile is ensured by forming the die with a split rigid structure in combination with the urethane convex die. The shape accuracy of the part is ensured by adjusting the cutting parameters. Compared with the method of forming first and then welding, it does not require a lot of time for weld grinding and deformation correction, which greatly improves labor efficiency. At present, the processing method of the present invention has been used on site and has achieved the purpose of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is the front view of the cross-fire tube;

[0047] Figure 2 yes Figure 1 Middle AA section cutaway view;

[0048] Figure 3 yes Figure 2 A partial enlarged view of the AA section view;

[0049] Figure 4 It is a structural diagram of a forming die for forming the curved tube profile in a combined flame tube;

[0050] In the figure: 1-bushing; 2-punch; 3-reinforcement ring; 4-die; 5-upper template; 6-lower template; 7-top rod; 8-pad; 9-top plate. DETAILED DESCRIPTION

[0051] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0052] In order to process Figure 1 to Figure 3 The present invention designs a method for processing a complex cross-fire tube with a flange in a three-dimensional space as shown below, comprising the following steps:

[0053] Step 1: Prepare the blank tube material, which is processed by rectangular plate material. After the plate shearing machine cuts the material, it is bent, pipe-made, welded, and heat-treated with a tube-making die to ensure the plasticity of the blank tube material. That is, the rectangular plate is cut and rolled and welded at both ends to form a straight tube, and then heat-treated to ensure the plasticity;

[0054] Step 2: Bevel cutting: bevel cutting an axial straight end surface of the blank tube;

[0055] Step 3: For the first flanging, the other axial straight end face of the blank tube is used for positioning, and the angled beveled edge after bevel processing is flanging. Cracks are not allowed to occur on the flanging edge;

[0056] Step 4: Heat treatment to remove the stress caused by flanging;

[0057] Step 5: Flanging for the second time, increase the angle of the first flanging, and no cracks are allowed on the flanging edge;

[0058] Step 6: Heat treatment to remove the stress caused by flanging;

[0059] Step 7: Correction: Correct the overall profile of the flanged H surface to meet the requirements of the drawing;

[0060] Step 8: Cutting: Cut the axial straight end face of the blank tube material used for positioning in step 3 to ensure an angle of α±0.5°;

[0061] Step 9: Forming, forming the curved tube profile of the cross-flame tube on the blank tube material, ensuring that the steel ball with a diameter of ΦD can smoothly pass through the inner cavity of the blank tube material after forming, and marking the edge of the flange according to the mold marking line, which serves as the reference line for subsequent processing;

[0062] Step 10: Turn the flange to obtain the outer diameter of the flange, align the engraved line of the blank tube with the engraved line of the turning fixture, turn the flange, and ensure that the diameter of the flange is equal to the designed outer diameter of the flange;

[0063] Step 11: Turn the straight end face, close to the flange, position it according to the shape of the blank tube, clamp the inner surface of the blank management, turn the straight end face M, and ensure that all dimensions meet the requirements of the cross-flame tube drawing.

[0064] Specifically, in step 1, when preparing the blank tube material, the length of the blank tube material is the longest dimension of the cross-fire tube after being unfolded along the axis plus a margin of 15 to 20 mm, and the diameter of the blank tube material is 2 to 3 mm smaller than the aperture of the cross-fire tube. The blank tube material is unfolded into a rectangular sheet material through the neutral layer of the cross-fire tube, and the sheet material is cut by a shearing machine to ensure that the four vertex angles of the sheet material are right angles of 90°;

[0065] Specifically, after the blank tube material prepared in step 1 is welded by argon arc welding, the roundness is corrected to be no greater than 1, and heat treatment is performed to remove welding stress;

[0066] Specifically, when cutting the bevel in step 2, the equipment used is a grinding wheel cutter. To ensure the consistency of the parts, the weld is set as the highest point of the cutting. To ensure that the flange diameter is greater than Φd1 and the flange width is reduced, the cutting angle can achieve angle processing when leveling in the subsequent sequence, and the flange width can be reduced. In this embodiment, the cutting angle is set to α1;

[0067] Specifically, in step 2, after beveling, the burrs generated by cutting are removed, and the high and low points of the cutting are rounded and polished within a range of 15 mm to the left and right;

[0068] Specifically, before the first flanging in step 3, varnish is sprayed on the inner and outer surfaces of the blank tube for lubrication. The flanging equipment is a 500KN hydraulic press. The flanging edge is at an angle of 30° to the center axis of the blank tube. The flanging transfer can be appropriately enlarged according to actual conditions.

[0069] Specifically, the heat treatment in step 4 is a solution treatment to soften the material and eliminate the forming stress;

[0070] Specifically, before the second flanging in step 5, varnish is sprayed on the inner and outer surfaces of the blank tube for lubrication. The flanging equipment is a 500KN hydraulic press, which is positioned with a straight end face and supported by the inner wall of the blank tube. The flanging edge forms an angle of 60° with the center axis of the blank tube, and the flanging connection is R4±1. The outer diameter after flanging is not less than Φd1-1mm;

[0071] Specifically, the heat treatment in step 6 is a solution treatment to soften the material and eliminate the forming stress;

[0072] Specifically, before step 7 correction, varnish is sprayed on the inner and outer surfaces of the blank tube for lubrication. The correction equipment is a 500KN hydraulic press, which is positioned with a straight end face, supported by the inner wall of the blank tube, and the flange is flattened. At the same time, the flange H surface (H surface is a plane) is corrected to be consistent with the final profile of the cross-fire tube, and the outer diameter of the flange is not less than Φd1;

[0073] Specifically, in step 7, the correction mold has a score line at the molding high point of the correction mold as a reference. When the blank tube material is corrected, the weld is aligned with the score line of the correction mold;

[0074] Specifically, in step 7, in order to ensure that the flange finally forms an angle of α1 with the vertical plane of the axis of the blank tube, the flange correction angle is smaller, for example, an angle of α1-3°;

[0075] Specifically, in step 8, a cutting fixture is used for cutting. There is a cut line on the cutting fixture as a cutting reference. The H surface (plane) of the flange is used for support. The weld is aligned with the cut line of the cutting fixture. The straight end face is cut with a grinding wheel. The cutting angle α ensures that the lowest point size of the straight end face after cutting has a margin of 3 to 5 mm.

[0076] Specifically, in step 8, burrs around the blank tube are removed after cutting;

[0077] Specifically, the equipment used for forming in step 9 is a 2000KN hydraulic press, the blank pipe material is placed in the forming mold, and the weld is aligned with the mark line used as a reference in the forming mold;

[0078] Specifically, the male die of the forming mold in step 9 is made of cylindrical urethane, the diameter of the cylindrical urethane is sufficient to be smoothly loaded into the inner hole of the blank tube material, the length of the cylindrical urethane is 15 to 20 mm greater than the total length of the blank tube material, and the female die of the forming mold is a split-flap rigid die, which is downwardly pressed by the forming equipment to extrude the male die of the urethane material so that the outer wall of the blank tube material fits the female die to realize the overall forming of the cross-fire tube bending profile;

[0079] Specifically, after forming in step 9, a line is drawn on the flange along the parting surface of the concave mold of the forming mold as a reference line for subsequent shape processing;

[0080] Specifically, after forming in step 9, a steel ball with a diameter of ΦD needs to pass smoothly through its inner hole (inner cavity), and at the same time, the flatness of the flange needs to be ensured to be no greater than 0.5;

[0081] Specifically, in step 10, the outer diameter of the flange is turned to obtain the final outer diameter of the flange, the H surface of the flange is supported, the profile A (the profile A already formed inside the blank tube material) is used for positioning, the outer end face (B surface) of the flange is pressed, and the outer circle of the flange is turned to ensure that the outer diameter of the flange is obtained. At the same time, the engraved line is led to the thickness direction of the flange as a reference for turning the straight end face in step 11, and the edge burrs of the flange are removed;

[0082] Specifically, in step 11, when turning the end face, close to the H surface of the flange, align the engraved line on the blank tube with the engraved line on the turning fixture, position and clamp it according to the shape of the blank tube, and turn the straight end face M to ensure that all the external dimensions of the blank tube meet the drawings.

[0083] Specifically, when inspecting the parts after turning the end face in step 11, a simulated inspection is performed using the working state of the linked flame tube. The inner end face of the flange (H face) is on a gauge block with a diameter of Φd1, and a gauge block with an inclined end face (inclination angle of α±5′) and a diameter of ΦD+2t+2mm is used to support the straight end face (M face) to ensure that the outer edge of the H face does not exceed the Φd1 gauge block, and the gap between the M face and the ΦD+2t+2mm gauge block plane is not greater than 0.5, then the part is judged to be qualified.

[0084] Assumptions Figure 1 to Figure 3 In the case where ΦD=35mm, Φd1=46.5mm, α=33°±0.5°, α1=22.5°±1°, L=14.1mm, t=1.5mm, the method for processing a three-dimensional complex flame tube with flange includes the following steps:

[0085] Step 1: Prepare the blank tube material. The blank tube material is processed by plate material. After the shearing machine cuts the rectangular plate material, it is bent, piped, welded and heat treated with a pipe making die to ensure the plasticity of the blank tube material. The outer diameter of the blank tube material is Φ36.5mm and the length is 45mm;

[0086] Step 2: Bevel cutting: cut one end of the blank tube into 22.5°±1°, with the highest point at the center of the weld, remove the burrs caused by cutting, and polish and round the highest and lowest points within the range of 15 to 20 mm;

[0087] Step 3: For the first flanging, the straight end face of the blank tube is positioned, the weld is aligned with the engraved line of the flanging die, and the angled bevel edge is flanging. The length from the flanging point to the edge is 6-7mm. The flanging edge is at an angle of 30° with the center of the blank tube. Cracks are not allowed on the edge.

[0088] Step 4: Heat treatment to remove the stress caused by flanging;

[0089] Step 5: For the second flanging, increase the first flanging angle, align the weld center with the flanging die score line, and make the flanging edge form an angle of 60° with the center of the blank tube. No cracks are allowed on the flanging edge.

[0090] Step 6: Heat treatment to remove the stress caused by flanging;

[0091] Step 7: Correction: the center of the weld of the blank tube is aligned with the mark line of the correction die. The correction flange plane forms an angle of 19.5° with the plane perpendicular to the center axis of the blank tube, which is 3° smaller than the final target α1=22.5°. A certain amount of deformation (angle) is reserved for the subsequent forming in step 9. In step 9, the liner 1 and the die 4 clamp the flange for forming while completing the correction of the remaining angle;

[0092] Step 8: Cutting: Align the center of the weld with the marking line of the cutting fixture, cut the straight end surface, ensure the angle is 33°±0.5°, and remove the burrs caused by cutting;

[0093] Step 9: Forming, align the weld center with the mold marking line, form the curved tube profile of the cross-fire tube, ensure that the steel ball with a diameter of Φ35.1 can smoothly pass through the inner cavity of the blank tube, and mark the flange surface according to the mold die parting line as the subsequent processing reference. Figure 4 The forming mold includes a liner 1, a punch 2, a reinforcement ring 3, a die 4, an upper mold 5, a lower mold 6, a push rod 7, a cushion block 8 and a top plate 9. The liner 1 is connected to the upper mold 5 by screws, the inner hole of the liner 1 is filled with a punch 2, a cushion block 8 is installed at the inner hole of the liner 1, and the cushion block 8 is connected to the upper mold 5 by screws. The lower end of the die 4 is placed on the lower mold 6 through the top plate 9. The die 4 is divided into multiple petals along the circumferential direction and is constrained by the reinforcement ring 3 of the circumferential outer ring. The reinforcement ring 3 is a circular ring and is installed on the lower mold 6 by screws. The push rod 7 is movably connected to the lower mold 6, and the upper end of the push rod 7 is close to the top plate 9. The forming principle is: Figure 4 The thick black solid line in the middle is the part. The upper template 5 goes up until the punch 2 is completely separated from the die 4. The parts with the second flanging are put into the die 4 after heat treatment, correction and cutting. The upper template 5 goes down to push the pad 8. The punch 2 completely fills the cavity of the die 4 under the extrusion pressure of the pad 8. Then the upper template 5 goes up, the push rod 7 goes up, and the top plate 9 goes up under the action of the push rod 7 to push the die 4 out of the reinforcement ring 3 to complete the bending tube profile of the cross-flame tube. Because the cross-flame tube is a spatial profile, the die 4 adopts a petal structure to take out the formed parts. The die 4 is made of a multi-petal structure spliced ​​along the circumferential direction. Therefore, a reinforcement ring 3 is used outside the die 4 to fix and constrain the die 4. Figure 3 The dimensions R1, R3 and R15 of the outer surface of the middle flange are achieved through the cooperation of the die 4, the punch 2 and the liner 1.

[0094] Step 10: Turn the outer diameter of the flange, align the engraved line after the flange is formed in step 9 with the engraved line of the turning fixture, turn the flange, ensure that the flange diameter is equal to the outer diameter of the flange in the drawing, and extend the engraved line on the flange surface to the thickness direction to remove the burrs caused by turning;

[0095] Step 11: Turn the end face straight, close to the flange, position and clamp the profile by the shape, align the scale line extending to the thickness direction in step 10 with the scale line of the turning fixture, turn the end face M, ensure all dimensions, and remove the burrs caused by turning.

[0096] The contents not described in detail in the specification of the present invention belong to the prior art known to the professional and technical personnel in the field. Although the illustrative specific embodiments of the present invention are described above to facilitate the understanding of the present invention by the technical personnel in the field, it should be clear that the present invention is not limited to the scope of the specific embodiments. For ordinary technicians in the field of this technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept of the present invention are protected.

Claims

1. A method for processing a three-dimensional complex cross-fire tube with a flange, characterized in that: The following steps are involved: Step 1: Prepare a blank tube material. The blank tube material is processed from a rectangular plate material, and is bent, pipe-made, welded and heat-treated in sequence using a tube-making die, and finally the rectangular plate material is prepared into a straight blank tube material; Step 2: Bevel cutting: bevel one axial straight end face of the blank tube and use it as the flange position; Step 3: The first flanging is performed by positioning the other axial straight end face of the blank tube material, and flanging is performed on the beveled end face after the bevel treatment in step 2. No cracks are allowed to form on the flanging edge. Step 4: Heat treatment to remove the stress caused by flanging; Step 5: The second flanging is to continue to increase the flanging angle based on the first flanging of the bevel end surface in step 3. No cracks are allowed on the flanging edge. Step 6: Heat treatment to remove the stress caused by flanging; Step 7: Correction: Correct the profile of the flange so that the profile of the flange meets the flange requirements in the drawing; Step 8: Cutting: Cut the straight end surface used for positioning in step 3 to ensure the angle α between the flange and the straight end surface in the drawing; Step 9: forming, forming the curved tube profile in the cross-fire tube on the straight-line blank tube material, ensuring that the inner cavity diameter of the blank tube material after forming is equal to the inner diameter ΦD of the cross-fire tube; Step 10: Turn the outer diameter of the flange to make it equal to the outer diameter of the flange; Step 11: Turn the straight end surface cut in step 8.

2. A method for processing a three-dimensional complex cross-fire tube with flange according to claim 1, characterized in that: In the step 1, the length of the blank tube material is the longest axial dimension of the cross-fire tube after being straightened and unfolded along the axis plus a margin, and the diameter is smaller than the aperture of the cross-fire tube. The blank tube material is unfolded into a rectangular plate material through the neutral layer, and the plate material is cut by a shearing machine to ensure that the plate material is at right angles on all sides; In the step 1, after the sheet is welded by argon arc welding, the roundness is corrected and heat treatment is performed to remove welding stress.

3. The method for processing a three-dimensional complex cross-fire tube with flange according to claim 1, characterized in that: In the step 2, a grinding wheel cutter is used to take the weld of the blank tube material in step 1 as the highest point of cutting to perform bevel cutting; In the step 2, the burrs generated by the cutting are removed after the bevel cutting, and the highest point and the lowest point of the cutting are rounded and polished within a certain distance offset to the left and right.

4. The method for processing a three-dimensional complex cross-fire tube with flange according to claim 1, characterized in that: In the step 3, before the first flanging, varnish is sprayed on the inner and outer surfaces of the blank tube material for lubrication, and the equipment for the first flanging is a hydraulic press; The heat treatment in step 4 is solution treatment; In the step 5, before the second flanging, varnish is sprayed on the inner and outer surfaces of the blank tube for lubrication. The equipment for the first flanging is a hydraulic press, which uses the straight end surface of the blank tube for positioning and the inner wall of the blank tube as support; The heat treatment in step 6 is solution treatment.

5. The method for processing a three-dimensional complex cross-fire tube with flange according to claim 1, characterized in that: In step 7, varnish is sprayed on the inner and outer surfaces of the blank tube for lubrication, and the correction equipment is a hydraulic press, which uses the straight end surface of the blank tube for positioning, and the inner wall of the blank tube as support to flatten the flange, and at the same time correct the flange profile to be consistent with the cross-fire tube flange profile; In step 7, there is a score line at the molding high point of the correction mold, and when the blank tube material is corrected, the weld is aligned with the score line of the correction mold; In step 7, the angle after flanging correction is smaller than the final angle α1.

6. The method for processing a three-dimensional complex cross-fire tube with flange according to claim 1, characterized in that: In step 8, cutting is performed using a cutting fixture with engraved lines on it, the flange is used as support, the weld is aligned with the engraved lines on the cutting fixture, and a grinding wheel is used to cut the straight end face of the blank tube material to ensure that the angle α between the flange and the straight end face is maintained; In step 8, after cutting is completed, burrs around the blank tube are removed.

7. The method for processing a three-dimensional complex cross-fire tube with flange according to claim 1, characterized in that: In step 9, the forming equipment is a hydraulic press, the blank pipe material is placed in the forming mold, and the weld is aligned with the engraved line on the forming mold; In the step 9, the convex mold of the forming mold is made of cylindrical urethane, the diameter of the cylindrical urethane can be smoothly loaded into the inner cavity of the blank tube material, and the length is greater than the total length of the blank tube material. The concave mold of the forming mold is a split-flap rigid mold, and the convex mold is extruded by the downward extrusion of the equipment, and the convex mold extrudes the inner wall of the blank tube material, so that the outer wall of the blank tube material fits the concave mold to realize the overall profile of the cross-flame tube; In step 9, after forming, a line is drawn on the flange along the parting surface of the concave mold of the forming mold as a reference line for subsequent flange shape processing; In step 9, after forming, the flatness of the flange is ensured while ensuring that the steel ball with an outer diameter of ΦD passes smoothly through the inner cavity of the blank tube.

8. The method for processing a three-dimensional complex cross-fire tube with flange according to claim 1, characterized in that: In step 10, when turning the outer diameter of the flange, the inner end face of the flange is supported, positioned with the inner cavity profile of the blank tube material, the outer end face of the flange is pressed, and then the circumferential surface of the flange is turned to obtain the flange outer diameter, and the burrs on the edge of the flange are removed.

9. The method for processing a three-dimensional complex cross-fire tube with flange according to claim 1, characterized in that: In the step 11, when turning the straight end face, the inner end face of the flange is pressed, positioned and clamped according to the shape of the blank tube material, and the straight end face of the blank tube material is turned; In the step 11, after the straight end face is turned, it is inspected by using the cross-flame tube in working state, respectively pressing the flange end face and the straight end face, and inspecting the outer diameter of the flange and the angle between the flange and the straight end face.

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