Machining process for reducing deformation of double-sided overflow lip plate of furnace nose

Abstract

The invention relates to a machining technology for reducing deformation of a furnace nose double-sided overflow lip plate. The machining technology comprises the steps that material pretreatment is conducted, specifically, precise leveling and double-sided synchronous shot blasting treatment are conducted on a stainless steel plate; stress relief is conducted after welding, wherein stress relief annealing treatment is conducted after the bottom plate and the rib plate are welded; lip opening rough machining and semi-finish machining are carried out, stress relief annealing treatment is carried out, solution treatment is carried out on the overflow lip plate obtained after semi-finish machining, and lip opening finish machining is carried out on the overflow lip plate obtained after solution treatment; and integral forming is conducted, specifically, after the overflow lip plate is subjected to surface anti-zinc-sticking treatment, integral assembling and welding are conducted, and stress is released. Through operations such as double-sided synchronous shot blasting treatment, stress relief annealing and solution treatment, stress relief is improved, and deformation is reduced.

Description

Technical Field

[0001] This application relates to the field of hot-dip galvanizing production equipment processing technology, and in particular to a processing technology for reducing the deformation of the double-sided overflow lip plate of the furnace nose. Background Technology

[0002] Currently, furnace noses are widely used in the hot-dip galvanizing process of sheet metal. They are rectangular-section channels connecting the annealing furnace and the zinc pot. After passing through the hot tension rollers in the annealing furnace, the strip steel is guided into the zinc pot through the furnace nose. Zinc ash and dross float on the surface of the molten zinc inside the furnace nose. These zinc ash and dross easily adhere to the strip steel surface, causing defects and reducing the yield. For these reasons, the industry has continuously explored and improved related technologies. Currently, a double-sided overflow structure is generally installed inside the furnace nose tip to allow the zinc ash and dross on the surface of the molten zinc to overflow into an overflow trough, thereby preventing them from adhering to the strip steel surface.

[0003] The existing double-sided overflow structure mainly consists of upper and lower overflow lips and two side plates forming the overflow liner, allowing molten zinc to overflow from the upper and lower surfaces and the two sides. However, because the lips operate under high temperature (450–600℃) and corrosive conditions (molten zinc) for extended periods, deformation and cracking have been observed in actual production, severely affecting the overflow effect of zinc ash and dross. The current manufacturing process for the furnace nose liner mainly includes: Step 1, Material Selection: 316L stainless steel is usually chosen as the raw material; Step 2, Material preparation (cutting and shaping): Use a laser cutting machine to prepare the material according to the design dimensions; Step 3, Welding the base plate: Weld the overflow lip plate to the base plate to form the overflow inner liner; Step 4, Surface machining (lip grinding and milling): Grind and mill the lip of the overflow lip plate according to the dimensional tolerance requirements of the design drawings; Step 5, Welding stiffeners: Weld cylindrical stiffeners to the non-working surface of the overflow lip plate; Step 6, Surface treatment: Apply a special anti-stick zinc coating to the surface of the overflow lip plate, and then apply multiple layers of ceramic agent for sintering. Step 7, overall welding: After assembling the overflow liner and the main body of the furnace nose, weld them together.

[0004] Based on practical application experience, the following problems have been identified with this manufacturing process: Large deformation after processing: The traditional overflow lip plate manufacturing process is to directly mill the overflow lip plate according to the design dimensions after welding the base plate. Therefore, the residual stress after welding is not fully released, and the internal stress accumulated during the milling process is also large, resulting in the flatness of the overflow lip plate after processing being out of tolerance (>1.5mm), which seriously affects the overflow effect. Under high-temperature conditions, the inner liner will creep due to the accumulation of thermal stress during welding and heat treatment. This causes the overflow lip plate to undergo plastic deformation after working in a high-temperature environment for about 20 days, with a deformation of about 1 mm / m, which greatly shortens its service life.

[0005] Therefore, how to overcome the shortcomings of the existing technology and solve the problems of large deformation after processing of the overflow lip plate and deformation at high temperature is a problem to be solved in this technical field. Summary of the Invention

[0006] In view of the above-mentioned defects or improvement needs of the prior art, and in order to solve the problems of large processing deformation and bending and cracking after working in high temperature environment for a period of time, this application provides a processing technology to reduce the deformation of the double-sided overflow lip plate of the furnace nose. Through double-sided synchronous shot peening, stress-relieving annealing and solution treatment, stress is eliminated and deformation is reduced.

[0007] The embodiments of this application adopt the following technical solutions: This application provides a processing technology to reduce the deformation of the double-sided overflow lip plate of the furnace nose, including: Material pretreatment: Precision leveling and double-sided simultaneous shot peening of stainless steel sheets; Post-welding stress relief: Stress-relieving annealing treatment is performed on the base plate and stiffening plate after welding; Lip processing: Rough and semi-finishing of the lip are performed, followed by stress-relieving annealing. The overflow lip plate after semi-finishing is then subjected to solution treatment, and the overflow lip plate after solution treatment is then subjected to lip finishing. Integral molding: After the overflow lip plate is treated with anti-stick zinc coating, it is assembled and welded as a whole to release stress.

[0008] By adopting the above technical solutions, precision leveling and double-sided synchronous shot peening of stainless steel plates can eliminate rolling internal stress and greatly reduce processing deformation. Stress-relief annealing after welding the base plate and stiffening plates, as well as after semi-finishing, can eliminate thermal stress, significantly reducing the thermal deformation of the overflow lip plate at high temperatures. Solution treatment of the overflow lip plate can release residual stress after processing, improve its corrosion resistance and high-temperature stability, and further reduce the deformation of the overflow lip plate caused by high temperatures after several days of actual operation. Based on the above process improvements, the goal of improving stress elimination and reducing deformation has been achieved.

[0009] In some embodiments, the dual-sided synchronous shot peening process includes: A residual compressive stress layer is formed on the surface of the steel plate by a shot flow, wherein the shot diameter is 0.5-2mm.

[0010] By adopting the above technical solution, the steel plate is subjected to double-sided synchronous shot peening, which induces plastic deformation and a residual compressive stress layer, thereby improving the fatigue strength of the steel plate, improving the residual stress distribution, and extending its service life.

[0011] In some embodiments, the stress-relief annealing treatment performed after welding the base plate and stiffening plate includes: After welding the base plate, perform overall stress-relieving annealing at a temperature of 550-570℃. After initial grinding of the lip surface, weld the reinforcing ribs onto the non-working surface of the overflow lip plate; After welding the stiffening plates, stress-relief annealing is performed at a temperature of 600-650℃ with slow cooling.

[0012] By adopting the above technical solution, the base plate is subjected to overall stress-relief annealing after welding, with a temperature requirement of 550-570℃. This temperature can effectively remove most of the welding residual stress and has little impact on mechanical properties. After welding the stiffening plate, stress-relief annealing is performed at a temperature requirement of 600-650℃ with heat preservation and slow cooling, which can release residual stress, stabilize the overall structure and dimensions, and reduce the tendency of deformation and cracking.

[0013] In some embodiments, the welding base plate includes: The base plate and overflow lip plate are welded by laser welding; During welding, welding is performed alternately from the center to both sides; rigid fixtures are used for fixation, and reasonable deformation is preset through finite element simulation; copper pads or air-cooled fixtures are also used on the back of the weld to accelerate heat dissipation. Immediately after welding, the high-temperature weld should be hammered or rolled.

[0014] By adopting the above technical solutions, laser welding is a welding method with low heat input. Welding is carried out alternately from the center to both sides, which can disperse the heat input. Using copper pads or air-cooled fixtures to accelerate heat dissipation can control the heat-affected zone, reduce heat accumulation, and avoid deformation due to stress concentration. Immediately after welding, the high-temperature weld is hammered or rolled to offset shrinkage stress.

[0015] In some embodiments, the stiffeners include blade-shaped reinforcing stiffeners, and the distribution density of the stiffeners is determined by finite element simulation.

[0016] By adopting the above technical solution, a cutting edge-shaped reinforcing rib is designed on the non-working surface of the overflow lip plate, and the distribution density of the rib plate is determined by finite element simulation, thereby increasing the overall bending strength by more than 25%.

[0017] In some embodiments, the roughing and semi-finishing of the lip and the stress-relieving annealing process include: The top of the overflow lip plate is rough-milled flat using a CNC milling machine; Perform aging treatment by heating the rough-machined overflow lip plate to 590-610℃ and holding it at that temperature for a preset time. The overflow lip plate is semi-finished and milled flat; The semi-finished overflow lip plate is heated to 550-570℃ and held at that temperature for a preset time, and then slowly cooled under inert gas protection.

[0018] By adopting the above technical solution, heating the rough-machined overflow lip plate to 590-610℃ and holding it at that temperature for tens of hours can accelerate stress relief; heating the semi-finished overflow lip plate to 550-570℃ and holding it at that temperature for 2 hours, followed by slow cooling under inert gas protection to prevent oxidation, can eliminate most of the residual stress.

[0019] In some embodiments, the solution treatment includes: The overflow lip plate is held at 1040-1060℃ for 45-55 minutes and then rapidly cooled to below 425℃ by water quenching.

[0020] By adopting the above technical solutions, solution treatment can "freeze" carbides in the solid solution, preventing them from precipitating out, thus ensuring optimal corrosion resistance and eliminating processing stress.

[0021] In some embodiments, an intermediate inspection is performed after the solution treatment, the lip finishing, and the surface anti-sticking zinc treatment. The intermediate inspection is used to check whether the processing error is acceptable and to make corrections based on the inspection results.

[0022] By adopting the above technical solution, multiple intermediate inspection processes can ensure that the error values ​​of the horizontal angle, tilt angle and height difference of the upper and lower lip plates become smaller and smaller after each processing, thereby improving the processing accuracy.

[0023] In some embodiments, a chamfering process is performed on the lip before welding the base plate.

[0024] By adopting the above technical solution, the chamfering of the lip can remove surface burrs and sharp edges, reduce friction and scratches between parts, and improve the surface quality and safety of parts.

[0025] In some embodiments, during the overall assembly welding and stress release process, weld shrinkage stress is eliminated by hammering or rolling.

[0026] By adopting the above technical solution, after the overall assembly and welding, the shrinkage stress of the weld can be eliminated by hammering or rolling, which can further eliminate stress and reduce the deformation of the lip plate.

[0027] Compared with the prior art, the beneficial effects of this application include, but are not limited to, the following: 1. Precision leveling and double-sided simultaneous shot peening of stainless steel sheets can eliminate rolling internal stress and greatly reduce processing deformation. Stress-relief annealing after welding the base plate and stiffening plates, as well as after semi-finishing, can eliminate thermal stress, significantly reducing the thermal deformation of the overflow lip plate at high temperatures. Solution treatment of the overflow lip plate can release residual stress after processing, improve its corrosion resistance and high-temperature stability, and further reduce the deformation of the overflow lip plate caused by high temperatures after several days of actual operation. Based on the above process improvements, the goal of improving stress elimination and reducing deformation is achieved.

[0028] 2. Heating the rough-machined overflow lip plate to 590-610℃ and holding it at that temperature for several tens of hours can accelerate stress relief; heating the semi-finished overflow lip plate to 550-570℃ and holding it at that temperature for 2 hours, followed by slow cooling under inert gas protection to prevent oxidation, can eliminate most of the residual stress.

[0029] 3. Multiple intermediate inspection processes can ensure that the error values ​​of the horizontal angle, tilt angle and height difference of the upper and lower lip plates become smaller and smaller after each processing, thus improving the processing accuracy. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly described below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A flowchart of a processing technology for reducing deformation of the double-sided overflow lip plate of the furnace nose, provided for this application; Figure 2 Detailed flow chart of the improved process provided for this application; Figure 3 A schematic diagram of the inner liner of the stove nose made using traditional techniques; Figure 4 A schematic diagram of the furnace nose liner manufactured using the improved process provided in this application.

[0032] Explanation of reference numerals in the attached figures: 1. Base plate; 2. Upper overflow lip plate; 3. Lower overflow lip plate; 4. Side plate; 5. Rib plate. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0034] Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] Example 1 like Figure 1 As shown, Embodiment 1 of this application provides a processing technology to reduce the deformation of the double-sided overflow lip plate of the furnace nose, including the following steps: Material pretreatment: The stainless steel sheet is precision leveled and shot peened on both sides simultaneously; this step can eliminate rolling internal stress and greatly reduce processing deformation.

[0036] Post-welding stress relief: Stress relief annealing is performed on the base plate and stiffening plate after welding. Stress relief annealing can eliminate thermal stress and greatly reduce the thermal deformation of the overflow lip plate at high temperature.

[0037] Lip processing: Rough and semi-finishing of the lip are performed, followed by stress-relieving annealing. The semi-finished overflow lip is then solution-treated, and the solution-treated overflow lip is then finished. Solution treatment of the overflow lip releases residual stress after processing, improves its corrosion resistance and high-temperature stability, and further reduces the deformation of the overflow lip caused by high temperature after several days of actual operation.

[0038] Integral forming: After the overflow lip plate is treated with anti-stick zinc coating, it is assembled and welded as a whole to release stress; after the overall assembly and welding, the shrinkage stress of the weld is eliminated by hammering or rolling, which can further eliminate stress and reduce lip plate deformation.

[0039] Based on the above process improvements, the goal of improving stress relief and reducing deformation has been achieved.

[0040] Furthermore, traditional processes lack quality inspection and control: current overflow lip plate manufacturing processes do not inspect and control the machining accuracy and dimensional tolerances of the overflow lip plate after important processes such as surface machining and surface treatment, leading to significant errors in actual measurement results. These errors include horizontal angle errors exceeding ±1°, tilt angle errors exceeding ±0.5°, and height differences exceeding ±0.8mm. To address these issues, this application provides intermediate inspection steps in some embodiments. For example, an intermediate inspection is performed after solution treatment, lip finishing, and surface anti-adhesion zinc treatment. This intermediate inspection checks whether the machining errors are acceptable and makes corrections based on the inspection results. Multiple intermediate inspection processes ensure that the errors in the horizontal angle, tilt angle, and height difference of the upper and lower lip plates decrease with each machining process, improving machining accuracy.

[0041] The above is a general description of the improved process of this application. The following detailed explanation of the improved process steps will further illustrate the solution of this application. The improved processing technology provided by this application to reduce the deformation of the double-sided overflow lip plate of the furnace nose includes improvements such as increasing material pretreatment, optimizing the milling process, improving machining accuracy, adding stress relief processes, and optimizing the inspection processes and standards of each process segment. These improvements significantly reduce the machining deformation and service deformation of the overflow lip plate, extending its service life.

[0042] The specific processing technology of this application includes the following steps: Step 1, Material Selection: Based on requirements such as high temperature resistance, oxidation resistance, corrosion resistance, high strength, low coefficient of thermal expansion, and good high temperature stability, stainless steel (i.e., 316L) with the standard GB / T 20878-2007 and grade 022Cr17Ni12Mo2 is generally selected as the raw material. Its chemical composition is measured with a spectrometer to ensure that the content of each metal element is within the standard range. Its tensile strength is about 515MPa, yield strength is about 205MPa, and hardness is about 217HB.

[0043] Step 2, Material Pre-treatment: 316L stainless steel plates are selected and precision leveled using a multi-roll leveling machine (model SMS 19-2000). Before leveling, the roller gaps of the leveling machine need to be adjusted so that the inlet roller gap is slightly smaller than the plate thickness, the middle roller gap gradually increases, and the outlet roller gap is equal to the plate thickness. Simultaneously, based on the yield strength and hardness properties of 316L, the leveling speed is set to 5 meters per minute. After leveling, a flatness measuring instrument is used on a high-precision platform to measure the local flatness and overall flatness at multiple locations. Double-sided synchronous shot peening: A pneumatic shot peening machine (nozzle distance 200mm, spray angle 90°) is used to spray 1mm diameter cast steel shot onto the surface of the steel plate at a pressure of 0.5 MPa. After shot peening, residual shot and dust on the steel plate surface are removed, and the surface quality and any unacceptable deformation are checked.

[0044] Step 3, material preparation (cutting and shaping): According to the dimensions in the drawing, use a laser cutting machine to cut the sheet material, and control the cutting allowance. After cutting, remove burrs and oxide scale to ensure that the reference surface for subsequent processing is flat.

[0045] Step 4, Structural optimization: Ensure the overall structure of the lip plate is symmetrical to reduce deformation caused by asymmetrical shrinkage; the overflow liner is made of 20mm thick steel plate to avoid local areas being too thick or too thin, thus reducing thermal stress concentration.

[0046] Step 5, chamfering the lip: Use a chamfering machine to chamfer the edge of the lip, remove surface burrs and sharp areas, reduce friction and scratches between parts, and improve the surface quality and safety of the parts.

[0047] Step Six, Welding the Base Plate: Select a welding method with low heat input, such as laser welding, to weld the base plate and overflow lip plate together. During welding, pay attention to welding from the center outwards, alternating between both sides to disperse the heat input. Use rigid fixtures for fixing during welding and preset reasonable deformation amounts through finite element simulation. Use copper pads or air-cooled fixtures on the back of the weld to accelerate heat dissipation, control the heat-affected zone, reduce heat accumulation, and avoid deformation due to stress concentration. Immediately after welding, hammer or roll the high-temperature weld to counteract shrinkage stress.

[0048] Step 7, stress-relief annealing: After welding, perform overall stress-relief annealing (560℃). This temperature can effectively remove most of the residual welding stress and has little impact on mechanical properties.

[0049] Step 8, rough grinding of the lip: perform preliminary grinding on the surface of the lip to improve surface smoothness and ensure processing accuracy.

[0050] Step 9, Welding stiffeners: Design cutting edge-shaped stiffeners on the non-working surface of the overflow lip plate, and determine the distribution density of the stiffeners through finite element simulation to increase the overall bending strength by more than 25%.

[0051] Step 10, Stress-relief annealing: The welded inner liner is subjected to stress-relief annealing treatment (holding at 600-650℃ and slow cooling) to release residual stress, stabilize the overall structure and dimensions, and reduce the tendency for deformation and cracking.

[0052] Step 11, rough milling of the lip: Use a CNC milling machine to rough mill the top of the overflow lip plate, removing most of the excess material (leaving 3-5mm for finishing) to ensure that the upper and lower lip plates are horizontal and at the same height.

[0053] Step 12, Aging Treatment: Heat the rough-machined overflow lip plate to 600℃ and keep it at that temperature for several hours to accelerate stress relief.

[0054] Step 13, semi-finish milling of the lip: Loosen the overflow lip plate fixture to release the clamping stress, fix the inner liner to the fixture with AB glue, and perform precision milling to ensure that the horizontal error of the upper and lower lip plates is less than 0.1° and that they are at the same height.

[0055] Step 14, Stress-relieving annealing: Heat the semi-finished overflow lip plate to 560℃ and hold for 2 hours, then slowly cool it under inert gas protection to prevent oxidation and eliminate most of the residual stress.

[0056] Step 15, Solution Treatment: The overflow lip plate is solution treated at 1050℃ in a nitrogen-filled protective atmosphere for 50 minutes to fully dissolve the internal carbides and homogenize the composition. Then, it is quenched in cold water at a temperature <40℃ and rapidly cooled through the sensitive temperature range for carbide precipitation (425-870℃). Ideally, it should be cooled to below 425℃ within 8 to 15 seconds, so that the carbides are "frozen" in the solid solution and cannot precipitate, ensuring the best corrosion resistance and eliminating processing stress.

[0057] Step 16, Intermediate Inspection: Measure and correct the milled surface to ensure that the horizontal angle error of the upper and lower overflow lips is less than ±0.1°.

[0058] Step 17, Lip finishing: Further refine the surface of the lip after machining according to the dimensional and geometric tolerance requirements. Monitor the deformation in real time during the machining process to improve the surface machining accuracy and reduce errors.

[0059] Step 18, Intermediate Inspection: Measure the distance, height difference, and tilt angle of the upper and lower overflow lips to ensure that each dimension is within the allowable minimum error range.

[0060] Step 19, Surface anti-sticking zinc treatment: The surface of the overflow lip plate is treated with special anti-sticking zinc, and multiple layers of ceramic agent are applied and sintered.

[0061] Step 20, Intermediate Inspection: Check the surface of the overflow lip plate after coating for defects and whether the thickness is uniform.

[0062] Step 21, Overall Assembly Welding and Stress Relief: The overflow inner liner is welded as a whole into the tip of the furnace nose. After welding, stress is relieved again by mechanical means such as hammering.

[0063] The differences and advantages of the above-mentioned detailed process compared with traditional techniques include: 1. In step two of this application, a "double-sided synchronous shot peening" operation is added. Specifically, a high-speed shot stream with a diameter of 1 mm or 1.5 mm is sprayed onto the surface of the steel plate at a pressure of 0.5 MPa to induce plastic deformation and a residual compressive stress layer, thereby improving the fatigue strength of the steel plate, improving the distribution of residual stress, and extending its service life.

[0064] 2. This application adds a "stress-relief annealing" operation in steps seven, ten and fourteen. Specifically, after each welding and semi-finishing process, the overflow lip plate is heated to a certain temperature, held at that temperature for a period of time and then slowly cooled to eliminate the internal stress caused by welding and processing, stabilize the overall structure and reduce the amount of deformation.

[0065] 3. In step 15 of this application, a "solution treatment" operation is added. Specifically, the overflow lip plate is kept at 1050°C for 50 minutes and then rapidly cooled to below 425°C by water quenching, thereby releasing the residual stress after processing, improving its corrosion resistance and high temperature stability, reducing deformation, and extending its service life.

[0066] 4. This application adds an "intermediate inspection" operation in steps sixteen, eighteen and twentieth. Specifically, tools such as a level and angle gauge are used to measure the surface of the processed overflow lip plate, and then corrections are made based on the measurement results to ensure that the error values ​​of the horizontal angle, tilt angle and height difference of the upper and lower lip plates become smaller and smaller after each processing, thereby improving its processing accuracy.

[0067] Example 2 Based on the processing technology for reducing the deformation of the double-sided overflow lip plate of the furnace nose provided in Example 1, this Example 2 compares and analyzes the furnace nose inner liner produced by the conventional process with the furnace nose inner liner produced by the improved process provided in this application.

[0068] refer to Figure 3 The image shown is a schematic diagram of the inner lining of a stove nose made using traditional techniques; for reference. Figure 4 The diagram shown is a schematic of the furnace nose liner manufactured using the improved process provided in this application. Both include a bottom plate 1, an upper overflow lip plate 2, a lower overflow lip plate 3, side plates 4, and stiffening plates 5; there are two side plates 4, located at both ends of the upper overflow lip plate 2 and the lower overflow lip plate 3 respectively, and connecting the upper overflow lip plate 2 and the lower overflow lip plate 3; multiple stiffening plates 5 are provided, located on the outer surfaces of the upper overflow lip plate 2 and the lower overflow lip plate 3 respectively. Figure 3 The rib plate 5 of the inner liner of the furnace nose, produced using traditional techniques, is a common cylindrical reinforcing rib. Figure 4 The improved process shown in the diagram produces a specially designed blade-shaped reinforcing rib 5 in the inner liner of the furnace nose. The distribution density of this blade-shaped reinforcing rib was determined through finite element simulation, resulting in an overall bending strength increase of over 25%. Aside from the difference in the rib 5, the final structures of the two inner liner furnace noses are not significantly different at the macroscopic level. The main difference lies in the microscopic differences caused by the different processes, as described in Example 1, and will not be repeated here.

[0069] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A process for reducing distortion of a double-sided overflow lip of a furnace nozzle, characterized by, The application relates to a method for manufacturing a stainless steel overflow lip plate. The method comprises the following steps: Material pretreatment: precise flattening and double-side synchronous shot blasting treatment are performed on a stainless steel plate; Stress release after welding: stress relief annealing treatment is respectively performed on a welded bottom plate and a rib plate; Lip processing treatment: rough machining and semi-finishing machining are performed on a lip, and stress relief annealing treatment is performed on the semi-finished overflow lip plate; solid solution treatment is performed on the semi-finished overflow lip plate; and lip finishing machining is performed on the overflow lip plate after the solid solution treatment; 2. The process of claim 1, wherein, Overall forming: after surface anti-sticking zinc treatment is performed on the overflow lip plate, overall assembly welding is performed, and stress is released. The double-side synchronous shot blasting treatment comprises the following steps:

3. The process of claim 1, wherein, A residual compressive stress layer is formed on the surface of the steel plate by a projectile flow, and the projectile diameter is 0.5-2 mm. The stress relief annealing treatment respectively performed on the welded bottom plate and the rib plate comprises the following steps: Overall stress relief annealing is performed after the bottom plate is welded, and the temperature requirement is 550-570 DEG C; After the surface of the lip is preliminarily polished, a rib plate is welded on the non-working surface of the overflow lip plate; 4. The process of claim 3, wherein, After the rib plate is welded, stress relief annealing treatment is performed, and the temperature requirement is 600-650 DEG C. The welding of the bottom plate comprises the following steps: The bottom plate and the overflow lip plate are welded by laser welding; During welding, double-side alternate welding is performed from the center to both sides; meanwhile, a rigid tool is fixed, and a reasonable deformation amount is preset through finite element simulation; meanwhile, a copper pad or a wind cooling tool is used on the back of the weld to accelerate heat dissipation; 5. The process of claim 3, wherein the process further comprises: Immediately after welding, hammering or rolling is performed on the high-temperature weld.

6. The process of reducing deformation of a double flow lip of a furnace nozzle according to claim 1, wherein The rib plate comprises a blade edge type reinforcing rib plate, and the rib plate distribution density is determined through finite element simulation. The rough machining and semi-finishing machining of the lip and the stress relief annealing treatment comprise the following steps: A numerical control milling machine is used to perform rough machining and milling on the top of the overflow lip plate; Aging treatment is performed, the rough machined overflow lip plate is heated to 590-610 DEG C and is kept for a preset time; Lip semi-finishing machining and milling are performed on the overflow lip plate; 7. The process of reducing deformation of a double flow lip of a furnace nozzle according to claim 1, wherein The semi-finished overflow lip plate is heated to 550-570 DEG C and is kept for a preset time, and then is slowly cooled under the protection of inert gas. The solid solution treatment comprises the following steps:

8. The process of reducing deformation of a double flow lip of a furnace nozzle according to claim 1, wherein The overflow lip plate is kept at a temperature of 1040-1060 DEG C for 45-55 minutes, and is rapidly cooled to below 425 DEG C through water quenching.

9. The process of reducing deformation of a double flow lip of a furnace nozzle according to claim 1, wherein After the solid solution treatment, the lip finishing machining and the surface anti-sticking zinc treatment, one intermediate inspection is respectively performed, the intermediate inspection is used for checking whether the machining error is qualified, and correction is performed according to the inspection result.

10. The process of reducing deformation of a double-sided overflow lip of a furnace nozzle according to claim 1, wherein Before the welding of the bottom plate, lip chamfering treatment is performed. During the overall assembly welding and stress release, weld shrinkage stress is eliminated through knocking or rolling.

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