A method for liquid forming a rectifier vane

Abstract

The application discloses a method for liquid-filled forming of a rectifying branch plate, and steps of the method comprise: selecting plate material for the rectifying branch plate, and cutting the plate material to obtain plate material; polishing a welding position of the plate material; extruding the plate material to form a cylindrical blank; welding a butt joint gap of the cylindrical blank to obtain a cylindrical blank; performing heat treatment on the cylindrical blank; pre-pressing the cylindrical blank into an elliptical cylindrical blank; and loading the elliptical cylindrical blank into a liquid-filled forming die to perform liquid-filled forming. The process of the application slowly injects high-pressure liquid into a closed cavity, gradually increases the liquid pressure, and applies flexible and uniform load of the high-pressure liquid to the inner wall of the elliptical cylindrical blank, so that the cylindrical blank is gradually and completely attached to a rectifying branch plate forming surface of the die, the final forming of a complex variable cross section is completed, wrinkles, cracks and springback of the part are effectively inhibited, the rectifying branch plate profile precision is ensured, the set hydraulic pressure is maintained during the machining process to keep pressure, the part is fully shaped and shaped, and internal residual stress is released.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine technology, and particularly relates to a method for liquid filling and forming of a fairing support plate. Background Technology

[0002] In aero-engine turbine components, the rectifier support plate is a key component that integrates airflow rectification, load bearing, and structural connection. Located at the turbine outlet, it must guide and rectify the high-temperature airflow at the turbine outlet, eliminate airflow swirl, regulate the flow field distribution, reduce the total pressure loss of the airflow, and ensure the aerodynamic efficiency of the engine. It must also withstand the aerodynamic loads, mechanical vibration loads, and high-temperature loads during turbine operation. Its structural strength and forming precision directly determine the operational stability and service life of the engine turbine system.

[0003] Currently, most rectifier support plates are made of high-temperature alloys. Due to their complex shape and thin-walled load-bearing structure, traditional manufacturing mainly adopts cold forming process. That is, by applying pressure through the rigid punch and die, the plate is plastically deformed at room temperature to fit the mold surface. Based on the hollow variable cross-section open structure of the rectifier support plate and the surface profile requirement of 0.2, cold forming has problems such as large springback and low processing accuracy. It is difficult to meet the stringent requirements of high precision, high strength and long service life of turbine support components for high-performance aero engines. Therefore, it is urgent to optimize and improve the forming process of the rectifier support plate. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a method for liquid filling and forming of a rectifier support plate.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a method for liquid filling and forming of a rectifier support plate, comprising the following steps: S1: Select the sheet material for the rectifier support plate, calculate the unfolded dimensions of the rectifier support plate, cut and prepare the sheet material; S2: Polish the area of ​​the sheet metal to be welded and wipe the surface to be welded. Then, press the sheet metal to bend and roll it into a cylindrical blank. S3: Weld the butt joint of the cylindrical blank, and then grind and polish the weld area to obtain the cylindrical blank. S4: Heat treatment is performed on the cylindrical blank to eliminate residual welding stress generated during the welding process; S5: Place the cylindrical blank into the first mold for pre-forming, and pre-press the cylindrical blank into an elliptical cylindrical blank; S6: The elliptical cylindrical blank is loaded into the liquid filling forming mold for liquid filling forming.

[0007] Preferably, the liquid-filling molding mold includes an upper template, an upper mold, a sealing core rod, a liquid-filling core rod, a lower mold, and a lower template. The upper pad I and upper pad II are disposed on the top of the upper template, and the upper template is disposed above the lower template. The bottom of the upper template is detachably connected to the upper mold, and the inner cavity of the lower template is detachably connected to the lower mold. Fixing blocks I and II are disposed on both sides above the lower template, and the sealing core rod and the liquid-filling core rod are respectively connected to fixing blocks I and fixing blocks II.

[0008] Preferably, the upper template is detachably connected to the upper pad I and the upper pad II, the upper pad I is disposed on both sides of the top of the upper template, and the sealing core rod upper pad II is disposed in the middle of the top of the upper template.

[0009] Preferably, the liquid conduit of the sealing core rod passes through the fixing block I, and the liquid conduit of the filling core rod passes through the fixing block II.

[0010] Preferably, the upper template is connected to the upper mold via rest block I and rest block II.

[0011] Preferably, the bottom surface of the upper mold is provided with a first processing groove, and the top surface of the lower mold is provided with a second processing groove.

[0012] Preferably, the heat treatment step in S4 includes: heating the cylindrical billet to 1120±10℃, holding it at that temperature for 6-10 minutes, and then air-cooling it out of the furnace.

[0013] Preferably, step S6 includes: A1: Load the elliptical cylindrical blank into the liquid filling forming mold, place the liquid filling forming mold on the worktable of the liquid filling forming equipment, insert the sealing core rod and the liquid filling core rod, so that the sealing core rod and the liquid filling core rod are connected to the liquid pipe of the liquid filling forming equipment respectively, and place the upper pad I and the upper pad II below the main slider of the liquid filling forming equipment. A2: The main slider moves down and contacts the upper pad I and upper pad II of the liquid filling forming mold. The main slider continues to move down until the upper and lower mold plates contact each other and the mold is closed. At this time, the two ends of the elliptical cylindrical blank are pressed and sealed, so that a closed cavity is formed inside the elliptical cylindrical blank. The liquid pipes of the sealing core rod and the liquid filling core rod are both extended into the cavity of the elliptical cylindrical blank. A3: Liquid is injected into the cavity of the elliptical cylindrical blank through the liquid-filling mandrel to expel the air inside the cavity and establish an initial liquid cushion. A4: Side-push cylinder slow-speed feeding; A5: Press down the main slide block to maintain a pressure of 300-400 Ton on the mold. The main slide block pressing speed is 2-6 mm / s. The liquid chamber pressure rises to 1-5 MPa, and the pressure rises at a speed of 4 MPa / s. Filling with liquid raises the pressure inside the cavity of the elliptical cylindrical blank to 1-5 MPa, and the pressure rises at a speed of 2-6 MPa / s. A6: The side push cylinder moves and fills the cavity with liquid to raise the pressure to 30-50 MPa, with a pressure increase rate of 2-6 MPa / s; A7: Press down the main slide block to maintain a pressure of 450-550 Ton on the mold, with a main slide block pressing speed of 2-6 mm / s; fill with liquid to raise the pressure inside the cavity of the elliptical cylindrical blank to 50-70 MPa, with a pressure increase speed of 2-6 MPa / s; A8: Press down the main slide block to maintain a pressure of 600-700 Ton on the mold, with a main slide block pressing speed of 2-6 mm / s; fill the cavity of the elliptical cylindrical blank with liquid to raise the pressure to 70-90 MPa, with a pressure increase speed of 2-6 MPa / s, and hold the pressure for 1-5 seconds; A9: The main slider rises and discharges the liquid in the cavity of the elliptical cylindrical blank through the sealing mandrel. The pressure drops to 1 MPa until the main slider no longer contacts the upper pad I and the upper pad II, completing the liquid filling and forming step of the rectifier support plate.

[0014] Preferably, in step A9, the liquid inside the cavity of the elliptical cylindrical blank is first discharged and the pressure is reduced to 60 MPa at a depressurization rate of 5 MPa / s; then the pressure formed by the rising main slide on the mold is reduced to 450-550 Ton at a rising speed of 3 mm / s. Next, the liquid inside the cavity of the elliptical cylindrical blank is discharged and the pressure is reduced to 40 MPa at a rate of 5 MPa / s; then the pressure formed by the rising main slide on the mold is reduced to 300-400 Ton at a rate of 3 mm / s. Finally, the liquid inside the cavity of the elliptical cylindrical blank is discharged and the pressure is reduced to 1 MPa at a rate of 4 MPa / s until the main slider no longer contacts the upper pad I and the upper pad II.

[0015] Preferably, in A6, the side thrust cylinder has a travel stroke of 90-105mm and a thrust speed of 0.5-2mm / s.

[0016] The beneficial effects of this invention are as follows: 1. The liquid filling molding of the present invention uses high-pressure liquid as a flexible force transmission medium, the plate is subjected to uniform force, which can significantly reduce local stress concentration, effectively suppress defects such as wrinkling and cracking, and the surface quality of the parts is high.

[0017] 2. Flexible pressure can significantly reduce the springback of parts, making the complex variable cross-section surface of the rectifier support plate more closely fit the mold and achieve higher dimensional accuracy.

[0018] 3. Liquid filling molding can improve the forming limit of materials, and is especially suitable for one-time integral forming of complex curved surfaces of high-temperature alloys.

[0019] 4. The uniform stress distribution during the forming process results in less internal stress on the parts, which helps to improve the structural rigidity and service life of the rectifier support plate.

[0020] 5. Liquid filling molding only requires a single-sided mold, the mold structure is simple, and the manufacturing difficulty and cost are low. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention; Figure 3 yes Figure 1 A schematic diagram of the AA cross-sectional structure; Figure 4 This is a schematic diagram of the cylindrical blank of the present invention; Figure 5 This is a schematic diagram of the structure of the elliptical cylindrical blank of the present invention; Figure 6 This is a schematic diagram of the finished rectifier support plate of the present invention; Figure 7 This is a schematic diagram of the finished rectifier support plate of the present invention; In the figure: 1-Upper pad I, 2-Upper pad II, 3-Upper template, 4-Upper mold, 41-First processing groove, 5-Fixing block I, 6-Fixing block II, 7-Sealing core rod, 8-Fluid filling core rod, 9-Lower mold, 91-Second processing groove, 10-Lower template, 11-Rest block I, 12-Rest block II. Detailed Implementation

[0022] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0023] Example 1: like Figures 1 to 7 As shown, a method for liquid filling and forming a rectifier support plate includes the following steps: S1: Select the plate material for the rectifier branch, calculate the unfolded dimensions of the rectifier branch, cut and blank the material to obtain the plate material, remove the burrs and flash from the edge of the plate material, and use mechanical means to remove the laser cutting remelted layer on the surface of the plate material to be welded. S2: Polish the area of ​​the sheet metal to be welded until a metallic luster is visible on both sides, and wipe the surface to be welded with acetone-soaked paper to keep it clean; then press the sheet metal to bend and roll it into a cylindrical blank. S3: Argon arc welding is performed on the butt joint of the cylindrical blank to ensure that the weld is flat, free of pores and cracks. After welding, the weld area is ground and polished to remove the welding slag and weld excess, so that the outer circumference of the cylinder is smoothly transitioned, and a cylindrical blank with uniform wall thickness and regular shape is obtained. S4: Heat treatment is performed on the cylindrical blank to eliminate residual welding stress generated during the welding process; S5: The cylindrical blank is placed into the first cold-forming rigid mold for pre-forming (the first mold is used to pre-press the cylindrical blank into an elliptical cylindrical blank, and its specific size can be adjusted according to the actual situation). The cylindrical blank is pre-pressed into an elliptical cylindrical blank, so that it gradually approaches the cross-sectional profile of the rectifier support plate, eliminating the large deformation of the subsequent liquid filling forming, and avoiding the problems of cracking and uneven deformation caused by direct liquid filling forming. S6: The elliptical cylindrical blank is loaded into the liquid-filling forming mold for liquid filling forming; S7: The elliptical cylindrical blank is machined by wire cutting to remove burrs and flash from the cut surface, resulting in a finished rectifier plate with precise profile, smooth surface, qualified structural strength, and meeting the requirements for use in aero-engine turbine supports.

[0024] The liquid-filling molding die includes an upper template 3, an upper mold 4, a sealing core rod 7, a liquid-filling core rod 8, a lower mold 9, and a lower template 10. The upper pad I1 and upper pad II2 are disposed on the top of the upper template 3. The upper template 3 is disposed above the lower template 10. The bottom of the upper template 3 is detachably connected to the upper mold 4. The inner cavity of the lower template 10 is detachably connected to the lower mold 9. Fixing blocks I5 and II6 are disposed on both sides above the lower template 10. The sealing core rod 7 and the liquid-filling core rod 8 are respectively connected to the fixing blocks I5 and II6.

[0025] The upper template 3 is detachably connected to the upper pad I1 and the upper pad II2. The upper pad I1 and the upper pad II2 are connected and fastened to the upper template 3 by screws. The upper pad I1 is set on both sides of the top of the upper template 3, and the upper pad II2 of the sealing core rod 7 is set in the middle of the top of the upper template 3.

[0026] The liquid conduit of the sealing core rod 7 passes through the fixing block I5, and the liquid conduit of the filling core rod 8 passes through the fixing block II6.

[0027] The upper template 3 and the upper template 4 are connected by rest block I11 and rest block II12.

[0028] The bottom surface of the upper mold 4 is provided with a first processing groove 41, and the top surface of the lower mold 9 is provided with a second processing groove 91. After the mold is closed, the cavity shape formed by the first processing groove 41 and the second processing groove 91 is adapted to the shape that the part needs to be processed into.

[0029] The heat treatment steps in S4 include: heating the cylindrical billet to 1110°C, holding it at that temperature for 6 minutes, and then air-cooling it out of the furnace.

[0030] Step S6 includes: A1: Load the elliptical cylindrical blank into the liquid filling forming mold, place the liquid filling forming mold on the worktable of the liquid filling forming equipment, insert the sealing core rod 7 and the liquid filling core rod 8, so that the sealing core rod 7 and the liquid filling core rod 8 are connected to the liquid pipe of the liquid filling forming equipment respectively, and place the upper pad I1 and the upper pad II2 below the main slider of the liquid filling forming equipment. A2: The main slider moves down and contacts the upper pad I1 and upper pad II2 of the liquid filling forming mold. The main slider continues to move down until the upper template 3 and lower template 10 contact and the mold is closed. At this time, the two ends of the elliptical cylindrical blank are pressed and sealed, so that a closed cavity is formed inside the elliptical cylindrical blank. The liquid pipes of the sealing core rod 7 and the liquid filling core rod 8 are both extended into the cavity of the elliptical cylindrical blank. A3: Liquid is injected into the cavity of the elliptical cylindrical blank through the liquid-filling mandrel 8 to expel the air inside the cavity and establish an initial liquid pad. A4: Side-push cylinder slow-speed feeding; A5: Press down the main slide block to maintain a pressure of 300 Ton on the mold. The main slide block pressing speed is 2 mm / s, and the liquid chamber pressure rises to 1 MPa at a pressing speed of 4 MPa / s. Filling with liquid raises the pressure inside the cavity of the elliptical blank to 1 MPa at a pressing speed of 2 MPa / s, establishing the initial blank holder force on the elliptical blank, pre-expanding the elliptical blank under low pressure, and preventing wrinkling of the elliptical blank. A6: The side push cylinder moves and fills the cavity with liquid, raising the pressure inside the elliptical cylindrical blank to 30 MPa at a rate of 2 MPa / s. A7: The main slide block is pressed down to maintain a pressure of 450 Ton on the mold, and the main slide block pressing speed is 2 mm / s; the liquid filling raises the pressure in the cavity of the elliptical cylindrical blank to 50 MPa, and the pressure increase speed is 2 MPa / s; A8: Press down the main slide block to maintain a pressure of 600 Ton on the mold, with a main slide block pressing speed of 2 mm / s; fill the cavity of the elliptical cylindrical blank with liquid to raise the pressure to 70 MPa, with a pressure increase speed of 2 MPa / s and a pressure holding time of 1 s; A9: The main slider rises and discharges the liquid in the cavity of the elliptical cylindrical blank through the sealing mandrel 7. The pressure drops to 1 MPa until the main slider no longer contacts the upper pad I1 and the upper pad II2, completing the liquid filling and forming step of the rectifier support plate.

[0031] In step A9, the liquid inside the cavity of the elliptical cylindrical blank is first discharged and the pressure is reduced to 60 MPa at a rate of 5 MPa / s; then the pressure formed by the rising main slide on the mold is reduced to 450 Ton at a rate of 3 mm / s. The liquid inside the cavity of the elliptical cylindrical blank is then discharged and the pressure is reduced to 40 MPa at a rate of 5 MPa / s. Then the pressure exerted on the mold by the rising main slide is reduced to 300 Ton at a rate of 3 mm / s. Finally, the liquid inside the cavity of the elliptical cylindrical blank is discharged and the pressure is reduced to 1 MPa at a rate of 4 MPa / s until the main slider no longer contacts the upper pad I1 and the upper pad II2.

[0032] In the A6, the side thrust cylinder has a travel stroke of 90-105mm and a thrust speed of 0.5mm / s.

[0033] Example 2: like Figures 1 to 7 As shown, a method for liquid filling and forming a rectifier support plate includes the following steps: S1: Select the plate material for the rectifier branch, calculate the unfolded dimensions of the rectifier branch, cut and blank the material to obtain the plate material, remove the burrs and flash from the edge of the plate material, and use mechanical means to remove the laser cutting remelted layer on the surface of the plate material to be welded. S2: Polish the area of ​​the sheet metal to be welded until a metallic luster is visible on both sides, and wipe the surface to be welded with acetone-soaked paper to keep it clean; then press the sheet metal to bend and roll it into a cylindrical blank. S3: Argon arc welding is performed on the butt joint of the cylindrical blank to ensure that the weld is flat, free of pores and cracks. After welding, the weld area is ground and polished to remove the welding slag and weld excess, so that the outer circumference of the cylinder is smoothly transitioned, and a cylindrical blank with uniform wall thickness and regular shape is obtained. S4: Heat treatment is performed on the cylindrical blank to eliminate residual welding stress generated during the welding process; S5: The cylindrical blank is placed into the first cold-forming rigid mold for pre-forming (the first mold is used to pre-press the cylindrical blank into an elliptical cylindrical blank, and its specific size can be adjusted according to the actual situation). The cylindrical blank is pre-pressed into an elliptical cylindrical blank, so that it gradually approaches the cross-sectional profile of the rectifier support plate, eliminating the large deformation of the subsequent liquid filling forming, and avoiding the problems of cracking and uneven deformation caused by direct liquid filling forming. S6: The elliptical cylindrical blank is loaded into the liquid-filling forming mold for liquid filling forming; S7: The elliptical cylindrical blank is machined by wire cutting to remove burrs and flash from the cut surface, resulting in a finished rectifier plate with precise profile, smooth surface, qualified structural strength, and meeting the requirements for use in aero-engine turbine supports.

[0034] The liquid-filling molding die includes an upper template 3, an upper mold 4, a sealing core rod 7, a liquid-filling core rod 8, a lower mold 9, and a lower template 10. The upper pad I1 and upper pad II2 are disposed on the top of the upper template 3. The upper template 3 is disposed above the lower template 10. The bottom of the upper template 3 is detachably connected to the upper mold 4. The inner cavity of the lower template 10 is detachably connected to the lower mold 9. Fixing blocks I5 and II6 are disposed on both sides above the lower template 10. The sealing core rod 7 and the liquid-filling core rod 8 are respectively connected to the fixing blocks I5 and II6.

[0035] The upper template 3 is detachably connected to the upper pad I1 and the upper pad II2. The upper pad I1 and the upper pad II2 are connected and fastened to the upper template 3 by screws. The upper pad I1 is set on both sides of the top of the upper template 3, and the upper pad II2 of the sealing core rod 7 is set in the middle of the top of the upper template 3.

[0036] The liquid conduit of the sealing core rod 7 passes through the fixing block I5, and the liquid conduit of the filling core rod 8 passes through the fixing block II6.

[0037] The upper template 3 and the upper template 4 are connected by rest block I11 and rest block II12.

[0038] The bottom surface of the upper mold 4 is provided with a first processing groove 41, and the top surface of the lower mold 9 is provided with a second processing groove 91. After the mold is closed, the cavity shape formed by the first processing groove 41 and the second processing groove 91 is adapted to the shape that the part needs to be processed into.

[0039] The heat treatment steps in S4 include: heating the cylindrical billet to 1130°C, holding it at that temperature for 10 minutes, and then air-cooling it out of the furnace.

[0040] Step S6 includes: A1: Load the elliptical cylindrical blank into the liquid filling forming mold, place the liquid filling forming mold on the worktable of the liquid filling forming equipment, insert the sealing core rod 7 and the liquid filling core rod 8, so that the sealing core rod 7 and the liquid filling core rod 8 are connected to the liquid pipe of the liquid filling forming equipment respectively, and place the upper pad I1 and the upper pad II2 below the main slider of the liquid filling forming equipment. A2: The main slider moves down and contacts the upper pad I1 and upper pad II2 of the liquid filling forming mold. The main slider continues to move down until the upper template 3 and lower template 10 contact and the mold is closed. At this time, the two ends of the elliptical cylindrical blank are pressed and sealed, so that a closed cavity is formed inside the elliptical cylindrical blank. The liquid pipes of the sealing core rod 7 and the liquid filling core rod 8 are both extended into the cavity of the elliptical cylindrical blank. A3: Liquid is injected into the cavity of the elliptical cylindrical blank through the liquid-filling mandrel 8 to expel the air inside the cavity and establish an initial liquid pad. A4: Side-push cylinder slow-speed feeding; A5: Press down the main slide block to maintain a pressure of 400 Ton on the mold. The main slide block pressing speed is 6 mm / s, and the liquid chamber pressure rises to 5 MPa at a pressing speed of 4 MPa / s. Filling with liquid raises the pressure inside the cavity of the elliptical blank to 5 MPa at a pressing speed of 6 MPa / s, establishing the initial blank holder force on the elliptical blank, pre-expanding the elliptical blank under low pressure, and preventing wrinkling of the elliptical blank. A6: The side push cylinder moves and fills the cavity with liquid, raising the pressure inside the elliptical cylindrical blank to 50 MPa at a rate of 6 MPa / s. A7: The main slide block is pressed down to maintain a pressure of 550 Ton on the mold, and the main slide block pressing speed is 6 mm / s; the liquid filling raises the pressure in the cavity of the elliptical cylindrical blank to 70 MPa, and the pressure increase speed is 6 MPa / s; A8: Press down the main slide block to maintain a pressure of 700 Ton on the mold, with a main slide block pressing speed of 6 mm / s; fill the cavity of the elliptical cylindrical blank with liquid to raise the pressure to 90 MPa, with a pressure increase speed of 6 MPa / s, and hold the pressure for 5 seconds; A9: The main slider rises and discharges the liquid in the cavity of the elliptical cylindrical blank through the sealing mandrel 7. The pressure drops to 1 MPa until the main slider no longer contacts the upper pad I1 and the upper pad II2, completing the liquid filling and forming step of the rectifier support plate.

[0041] In step A9, the liquid inside the cavity of the elliptical cylindrical blank is first discharged and the pressure is reduced to 60 MPa at a rate of 5 MPa / s; then the pressure formed by the rising main slide on the mold is reduced to 550 Ton at a rate of 3 mm / s. The liquid inside the cavity of the elliptical cylindrical blank is then discharged and the pressure is reduced to 40 MPa at a rate of 5 MPa / s; then the pressure exerted on the mold by the rising main slide is reduced to 400 Ton at a rate of 3 mm / s. Finally, the liquid inside the cavity of the elliptical cylindrical blank is discharged and the pressure is reduced to 1 MPa at a rate of 4 MPa / s until the main slider no longer contacts the upper pad I1 and the upper pad II2.

[0042] In the A6, the side thrust cylinder has a travel distance of 105mm and a thrust speed of 2mm / s.

[0043] Example 3: like Figures 1 to 7 As shown, a method for liquid filling and forming a rectifier support plate includes the following steps: S1: Select the plate material for the rectifier branch, calculate the unfolded dimensions of the rectifier branch, cut and blank the material to obtain the plate material, remove the burrs and flash from the edge of the plate material, and use mechanical means to remove the laser cutting remelted layer on the surface of the plate material to be welded. S2: Polish the area of ​​the sheet metal to be welded until a metallic luster is visible on both sides, and wipe the surface to be welded with acetone-soaked paper to keep it clean; then press the sheet metal to bend and roll it into a cylindrical blank. S3: Argon arc welding is performed on the butt joint of the cylindrical blank to ensure that the weld is flat, free of pores and cracks. After welding, the weld area is ground and polished to remove the welding slag and weld excess, so that the outer circumference of the cylinder is smoothly transitioned, and a cylindrical blank with uniform wall thickness and regular shape is obtained. S4: Heat treatment is performed on the cylindrical blank to eliminate residual welding stress generated during the welding process; S5: The cylindrical blank is placed into the first cold-forming rigid mold for pre-forming (the first mold is used to pre-press the cylindrical blank into an elliptical cylindrical blank, and its specific size can be adjusted according to the actual situation). The cylindrical blank is pre-pressed into an elliptical cylindrical blank, so that it gradually approaches the cross-sectional profile of the rectifier support plate, eliminating the large deformation of the subsequent liquid filling forming, and avoiding the problems of cracking and uneven deformation caused by direct liquid filling forming. S6: The elliptical cylindrical blank is loaded into the liquid-filling forming mold for liquid filling forming; S7: The elliptical cylindrical blank is machined by wire cutting to remove burrs and flash from the cut surface, resulting in a finished rectifier plate with precise profile, smooth surface, qualified structural strength, and meeting the requirements for use in aero-engine turbine supports.

[0044] The liquid-filling molding die includes an upper template 3, an upper mold 4, a sealing core rod 7, a liquid-filling core rod 8, a lower mold 9, and a lower template 10. The upper pad I1 and upper pad II2 are disposed on the top of the upper template 3. The upper template 3 is disposed above the lower template 10. The bottom of the upper template 3 is detachably connected to the upper mold 4. The inner cavity of the lower template 10 is detachably connected to the lower mold 9. Fixing blocks I5 and II6 are disposed on both sides above the lower template 10. The sealing core rod 7 and the liquid-filling core rod 8 are respectively connected to the fixing blocks I5 and II6.

[0045] The upper template 3 is detachably connected to the upper pad I1 and the upper pad II2. The upper pad I1 and the upper pad II2 are connected and fastened to the upper template 3 by screws. The upper pad I1 is set on both sides of the top of the upper template 3, and the upper pad II2 of the sealing core rod 7 is set in the middle of the top of the upper template 3.

[0046] The liquid conduit of the sealing core rod 7 passes through the fixing block I5, and the liquid conduit of the filling core rod 8 passes through the fixing block II6.

[0047] The upper template 3 and the upper template 4 are connected by rest block I11 and rest block II12.

[0048] The bottom surface of the upper mold 4 is provided with a first processing groove 41, and the top surface of the lower mold 9 is provided with a second processing groove 91. After the mold is closed, the cavity shape formed by the first processing groove 41 and the second processing groove 91 is adapted to the shape that the part needs to be processed into.

[0049] The heat treatment steps in S4 include: heating the cylindrical billet to 1120°C, holding it at that temperature for 8 minutes, and then air-cooling it out of the furnace.

[0050] Step S6 includes: A1: Load the elliptical cylindrical blank into the liquid filling forming mold, place the liquid filling forming mold on the worktable of the liquid filling forming equipment, insert the sealing core rod 7 and the liquid filling core rod 8, so that the sealing core rod 7 and the liquid filling core rod 8 are connected to the liquid pipe of the liquid filling forming equipment respectively, and place the upper pad I1 and the upper pad II2 below the main slider of the liquid filling forming equipment. A2: The main slider moves down and contacts the upper pad I1 and upper pad II2 of the liquid filling forming mold. The main slider continues to move down until the upper template 3 and lower template 10 contact and the mold is closed. At this time, the two ends of the elliptical cylindrical blank are pressed and sealed, so that a closed cavity is formed inside the elliptical cylindrical blank. The liquid pipes of the sealing core rod 7 and the liquid filling core rod 8 are both extended into the cavity of the elliptical cylindrical blank. A3: Liquid is injected into the cavity of the elliptical cylindrical blank through the liquid-filling mandrel 8 to expel the air inside the cavity and establish an initial liquid pad. A4: Side-push cylinder slow-speed feeding; A5: Press down the main slide block to maintain a pressure of 350 Ton on the mold. The main slide block pressing speed is 3 mm / s, the liquid chamber pressure rises to 3 Pa, and the pressure rises at a speed of 4 MPa / s. The liquid filling raises the pressure inside the cavity of the elliptical blank to 3 MPa, and the pressure rises at a speed of 4 MPa / s. This establishes the initial blank holder force on the elliptical blank, pre-expands the elliptical blank under low pressure, and prevents the elliptical blank from wrinkling. A6: The side push cylinder moves and fills the cavity with liquid, raising the pressure inside the elliptical cylindrical blank to 40 MPa at a rate of 4 MPa / s. A7: The main slide block is pressed down to maintain a pressure of 500 Ton on the mold, and the main slide block pressing speed is 3 mm / s; the liquid filling raises the pressure in the cavity of the elliptical cylindrical blank to 60 MPa, and the pressure increase speed is 4 MPa / s; A8: Press down the main slide block to maintain a pressure of 650 Ton on the mold, with a main slide block pressing speed of 3 mm / s; fill with liquid to raise the pressure inside the cavity of the elliptical cylindrical blank to 80 MPa, with a pressure increase speed of 7 MPa / s, and hold the pressure for 2 seconds; A9: The main slider rises and discharges the liquid in the cavity of the elliptical cylindrical blank through the sealing mandrel 7. The pressure drops to 1 MPa until the main slider no longer contacts the upper pad I1 and the upper pad II2, completing the liquid filling and forming step of the rectifier support plate.

[0051] In step A9, the liquid inside the cavity of the elliptical cylindrical blank is first discharged and the pressure is reduced to 60 MPa at a rate of 5 MPa / s; then the pressure formed on the mold by the rising main slide is reduced to 500 Ton at a rate of 3 mm / s. The liquid inside the cavity of the elliptical cylindrical blank is then discharged and the pressure is reduced to 40 MPa at a rate of 5 MPa / s. Then the pressure formed by the rising main slide on the mold is reduced to 350 Ton at a rate of 3 mm / s. Finally, the liquid inside the cavity of the elliptical cylindrical blank is discharged and the pressure is reduced to 1 MPa at a rate of 4 MPa / s until the main slider no longer contacts the upper pad I1 and the upper pad II2.

[0052] In the A6, the side thrust cylinder has a travel of 97.5 mm and a thrust speed of 1 mm / s.

Claims

1. A method for liquid filling and forming a rectifier support plate, characterized in that: Includes the following steps: S1: Select the sheet material for the rectifier support plate, calculate the unfolded dimensions of the rectifier support plate, cut and prepare the sheet material; S2: Polish the area of ​​the sheet metal to be welded and wipe the surface to be welded; then press the sheet metal to bend and roll it into a cylindrical blank. S3: Weld the butt joint of the cylindrical blank, and then grind and polish the weld area to obtain the cylindrical blank. S4: Heat treatment is performed on the cylindrical blank to eliminate residual welding stress generated during the welding process; S5: Place the cylindrical blank into the first mold for pre-forming, and pre-press the cylindrical blank into an elliptical cylindrical blank; S6: The elliptical cylindrical blank is loaded into the liquid filling forming mold for liquid filling forming.

2. The method for liquid filling and forming a rectifier support plate as described in claim 1, characterized in that: The liquid-filling molding die includes an upper template (3), an upper mold (4), a sealing core rod (7), a liquid-filling core rod (8), a lower mold (9), and a lower template (10). The upper pad I (1) and the upper pad II (2) are set on the top of the upper template (3). The upper template (3) is set above the lower template (10). The bottom of the upper template (3) is detachably connected to the upper mold (4). The inner cavity of the lower template (10) is detachably connected to the lower mold (9). Fixing blocks I (5) and II (6) are set on both sides above the lower template (10). The sealing core rod (7) and the liquid-filling core rod (8) are respectively connected to fixing blocks I (5) and II (6).

3. The method for liquid filling and forming of a rectifier support plate as described in claim 2, characterized in that: The upper template (3) is detachably connected to the upper pad I (1) and the upper pad II (2). The upper pad I (1) is set on both sides of the top of the upper template (3), and the upper pad II (2) of the sealing core rod (7) is set in the middle of the top of the upper template (3).

4. The method for liquid filling and forming of a rectifier support plate as described in claim 2, characterized in that: The liquid conduit of the sealing core rod (7) passes through the fixing block I (5), and the liquid conduit of the filling core rod (8) passes through the fixing block II (6).

5. The method for liquid filling and forming a rectifier support plate as described in claim 2, characterized in that: The upper template (3) and the upper mold (4) are connected by rest block I (11) and rest block II (12).

6. The method for liquid filling and forming of a rectifier support plate as described in claim 2, characterized in that: The bottom surface of the upper mold (4) is provided with a first processing groove (41), and the top surface of the lower mold (9) is provided with a second processing groove (91).

7. The method for liquid filling and forming of a rectifier support plate as described in claim 1, characterized in that: The heat treatment steps in S4 include: heating the cylindrical billet to 1120±10℃, holding it at that temperature for 6-10 minutes, and then air-cooling it out of the furnace.

8. The method for liquid filling and forming of a rectifier support plate as described in claim 1, characterized in that: Step S6 includes: A1: Load the elliptical cylindrical blank into the liquid filling forming mold, place the liquid filling forming mold on the working table of the liquid filling forming equipment, insert the sealing core rod (7) and the liquid filling core rod (8), so that the sealing core rod (7) and the liquid filling core rod (8) are connected to the liquid pipe of the liquid filling forming equipment respectively, and the upper pad I (1) and the upper pad II (2) are placed below the main slider of the liquid filling forming equipment. A2: The main slider moves down and contacts the upper pad I (1) and upper pad II (2) of the liquid filling forming mold. The main slider continues to move down until the upper template (3) and lower template (10) contact and the mold is closed. At this time, the two ends of the elliptical blank are pressed and sealed, so that a closed cavity is formed inside the elliptical blank. The liquid pipes of the sealing core rod (7) and the liquid filling core rod (8) are both extended into the cavity of the elliptical blank. A3: Liquid is injected into the cavity of the elliptical cylindrical blank through the liquid-filling mandrel (8) to expel the air inside the cavity and establish an initial liquid pad. A4: Side-push cylinder slow-speed feeding; A5: Press down the main slide block to maintain a pressure of 300-400 Ton on the mold. The main slide block pressing speed is 2-6 mm / s. The liquid chamber pressure rises to 1-5 MPa, and the pressure rises at a speed of 4 MPa / s. Filling with liquid raises the pressure inside the cavity of the elliptical cylindrical blank to 1-5 MPa, and the pressure rises at a speed of 2-6 MPa / s. A6: The side push cylinder moves and fills the cavity with liquid to raise the pressure to 30-50 MPa, with a pressure increase rate of 2-6 MPa / s; A7: Press down the main slide block to maintain a pressure of 450-550 Ton on the mold, with a main slide block pressing speed of 2-6 mm / s; fill with liquid to raise the pressure inside the cavity of the elliptical cylindrical blank to 50-70 MPa, with a pressure increase speed of 2-6 MPa / s; A8: Press down the main slide block to maintain a pressure of 600-700 Ton on the mold, with a main slide block pressing speed of 2-6 mm / s; fill the cavity of the elliptical cylindrical blank with liquid to raise the pressure to 70-90 MPa, with a pressure increase speed of 2-6 MPa / s, and hold the pressure for 1-5 seconds; A9: The main slider rises and discharges the liquid in the cavity of the elliptical cylindrical blank through the sealing core rod (7). The pressure drops to 1 MPa until the main slider no longer contacts the upper pad I (1) and the upper pad II (2), completing the liquid filling and forming step of the rectifier support plate.

9. The method for liquid filling and forming of a rectifier support plate as described in claim 8, characterized in that: In step A9, the liquid inside the cavity of the elliptical cylindrical blank is first discharged and the pressure is reduced to 60 MPa at a rate of 5 MPa / s; then the pressure formed by the rising main slide on the mold is reduced to 450-550 Ton at a rate of 3 mm / s. Next, the liquid inside the cavity of the elliptical cylindrical blank is discharged and the pressure is reduced to 40 MPa at a rate of 5 MPa / s; then the pressure formed by the rising main slide on the mold is reduced to 300-400 Ton at a rate of 3 mm / s. Finally, the liquid inside the cavity of the elliptical cylindrical blank is discharged and the pressure is reduced to 1 MPa at a rate of 4 MPa / s until the main slider no longer contacts the upper pad I (1) and the upper pad II (2).

10. The method for liquid filling and forming of a rectifier support plate as described in claim 8, characterized in that: In the A6, the side thrust cylinder has a travel stroke of 90-105mm and a thrust speed of 0.5-2mm / s.

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