A nickel alloy sheet post-welding correction device and method

Abstract

The present invention provides a device and method for post-welding correction of nickel alloy thin plates. The device includes a frame, an upper ram, a lower ram, a clamping system and a stretching mechanism. The clamping system is installed on the frame, and its upper and lower parts are respectively connected to the upper ram and the lower ram. The parts to be corrected are fixed on the frame and placed between the upper ram and the lower ram. The weld part of the part is located between two adjacent upper rams / lower rams. The clamping system is used to realize the upper ram and the lower ram to move closer or farther, and clamp or loosen the weld part of the part; the stretching mechanism is installed on the frame, close to the upper ram, and is used to drive the two adjacent upper rams to move in the opposite direction, so that the weld part between the two adjacent upper rams is stretched. The present invention avoids the problem of poor control of manual hammering force, excessive deformation, and cracking. The plastic deformation of the weld area is controllable, and the correction and stress relief effects are better.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation parts manufacturing, and in particular to a nickel alloy sheet post-welding correction device and method. Background Art

[0002] Nickel alloys have good mechanical properties and processing properties at room temperature, excellent mechanical properties and oxidation resistance at high temperature, and are indispensable materials in the aerospace field. Especially in the field of aero-engine manufacturing, nickel-based high-temperature alloys are used to make parts that are in high-temperature, high-load service conditions and require high reliability. The nickel alloys involved include GH4169 (Inconel 718 alloy), GH3030, Inconel750, Inconel 715, etc.

[0003] In order to reduce weight, nickel-based alloy sheets are usually first made into thin plates, and then connected and assembled into the required parts by welding.

[0004] As a welding defect, especially for thin plate welding, deformation is inevitable. The reason for welding deformation is thermal expansion and contraction during welding: the weld metal undergoes solidification and cooling processes, and volume shrinkage always occurs, while the heat-affected zone near the weld undergoes expansion when heated and contraction when cooled. However, the temperature of the parent material far away from the weld remains unchanged or changes little, and is less affected by thermal expansion and contraction. Therefore, the contraction of the weld metal and the expansion and contraction of the heat-affected zone metal are constrained by the parent material, resulting in asynchronous deformation and stress. This stress is called welding stress. Due to the easy instability of thin plates, thin plates usually undergo obvious or even serious deformation after welding. Post-weld correction must be performed to restore the shape and accuracy of the parts and eliminate stress to avoid deformation and cracking during subsequent service.

[0005] The post-weld correction of nickel alloy sheet weldments usually adopts the method of "bringing the tooling into the furnace", that is, after welding, the material is heated in the furnace together with the welding tooling to make the material creep at high temperature and release stress. The disadvantages of this method include the difficulty in making welding tooling, because it is necessary to consider the deformation of the tooling at high temperature to avoid new deformation of the parts caused by the high temperature strain of the tooling; it also includes the uneven cooling rate of the parts and the tooling during the cooling process, which causes new deformation of the parts; it also includes the effect of heat treatment on material properties, such as the generation of harmful precipitation phases; and the impact on production efficiency and cost. Therefore, in actual production, another method is also used, that is, hammering the weld position. The principle is to cause plastic deformation of the material in the weld and nearby positions to relax the stress. However, for some high-temperature alloys, such as GH4169 (Inconel 718 alloy), Inconel 750, Inconel 715 and other γ-strengthening nickel alloys, hammering can easily cause cracking.

[0006] Therefore, the present invention proposes a new method and device for post-welding correction and stress release of nickel-based high-temperature alloy thin plate weldments, which can avoid the need to carry tooling into the furnace after welding and can also avoid cracking caused by hammering the weld. Summary of the invention

[0007] According to the above-mentioned method of "bringing tooling into the furnace", the difficulty in making welding tooling is included, because the deformation of the tooling at high temperature needs to be considered to avoid new deformation of the parts caused by the high temperature strain of the tooling; it also includes the uneven cooling rate of the parts and the tooling during the cooling process, which causes new deformation of the parts; it also includes the influence of heat treatment on material properties, such as the generation of harmful precipitation phases; and the influence on production efficiency and cost; the method of hammering the weld position, for some high-temperature alloys, such as GH4169 (Inconel 718 alloy), Inconel 750, Inconel 715 and other γ-strengthening nickel alloys, hammering is very likely to cause cracking technical problems, and a nickel alloy sheet post-weld correction device and method are provided. The present invention mainly causes plastic strain in the weld and the area near the weld by uniaxial stretching along the weld direction at room temperature; when the plastic deformation of the weld area is large enough (that is, the weld area is stretched to the length before welding), this method can also relax the compressive stress loaded on the plate that causes it to become unstable. This method avoids the problem of cracking caused by poor control of manual hammering force, excessive deformation, and controllable plastic deformation in the weld area, and has better correction and stress relief effects.

[0008] The technical means adopted by the present invention are as follows:

[0009] A post-weld correction device for nickel alloy thin plates comprises: a frame, an upper pressure head, a lower pressure head, a clamping system and a stretching mechanism, wherein the clamping system is installed on the frame, and its upper and lower parts are respectively connected to the upper pressure head and the lower pressure head, the part to be corrected is fixed on the frame and placed between the upper pressure head and the lower pressure head, and the weld part of the part is located between two adjacent upper pressure heads / lower pressure heads. The clamping system is used to realize the upper pressure head and the lower pressure head to move closer or farther away, and to clamp or loosen the weld part of the part; the stretching mechanism is installed on the frame, close to the upper pressure head, and is used to drive the two adjacent upper pressure heads to move in the opposite direction, so that the weld part between the two adjacent upper pressure heads is stretched.

[0010] Furthermore, two upper pressing heads and two lower pressing heads are provided, and the two upper pressing heads and the two lower pressing heads are aligned one by one in a direction perpendicular to the surface of the part.

[0011] Furthermore, the upper pressure head and the lower pressure head are both conical or pyramidal and are made of alloy steel, high-speed steel or hard alloy;

[0012] The first end faces of the upper and lower pressure heads connected to the clamping system are planes; the second end faces of the upper and lower pressure heads in contact with the parts are processed into planes with smaller areas, and the second end faces are also processed with multiple shallow grooves to increase the friction between the second end faces and the weld surface.

[0013] Furthermore, the clamping system shown includes a first hydraulic system, two upper anvils and a lower anvil, wherein the first hydraulic system is installed at the bottom of the frame, the lower anvil is installed on the first hydraulic system, the two upper anvils are installed in the middle of the frame, the two upper pressure heads are respectively connected to the two upper anvils, and the two lower pressure heads are connected to the lower anvils; the lower anvil is driven up and down by the first hydraulic system, so that the parts are clamped or released by the upper and lower pressure heads.

[0014] Furthermore, the first hydraulic system is a manual or automatic hydraulic system, which adopts a hydraulic cylinder. The lower anvil is installed on the hydraulic cylinder piston. When the hydraulic cylinder piston moves up or down, it drives the lower anvil to move up or down, so that the parts are clamped or released by the upper and lower pressure heads; the maximum output force of the hydraulic cylinder piston is 500kN, and the first hydraulic system includes an oil pressure gauge.

[0015] Furthermore, the upper anvil and the lower anvil are made of magnetic steel, and the upper pressure head and the lower pressure head are respectively attracted by the magnetic upper anvil and the lower anvil; lubricating material is applied between the upper pressure head and the upper anvil, and between the lower pressure head and the lower anvil, and the lubricating material is graphite or molybdenum disulfide, etc.

[0016] Furthermore, the stretching mechanism includes a wedge block, a pressure rod and a second hydraulic system, the upper part of the pressure rod is connected to the second hydraulic system, the pressure rod passes through the lower part of the middle plate of the frame and is connected to the wedge block, and the wedge block is placed between two adjacent upper pressure heads; the wedge block is driven downward by the second hydraulic system to make the two adjacent upper pressure heads move in opposite directions on both sides, and the weld is stretched along its length direction, wherein the upper and lower pressure heads slide with the upper and lower anvils, and no sliding occurs between the pressure heads and the weld surface.

[0017] Furthermore, the cross-sectional shape of the wedge block is a trapezoid that is wide at the top and narrow at the bottom; the second hydraulic system adopts a hydraulic cylinder, and the piston of the hydraulic cylinder is connected to the upper part of the pressure rod.

[0018] The present invention also provides a correction method of a nickel alloy thin plate post-weld correction device, which is used for performing post-weld correction on a nickel-based alloy thin plate weldment, comprising the following steps:

[0019] Step 1. Preparation: Use an angle grinder, file or sandpaper to properly grind the weld to remove excess height and make the weld part flat;

[0020] Step 2: Clamping: Fix the parts on the frame, align the lower surface of the weld and make it close to the lower pressure head, and align each upper pressure head with each lower pressure head one by one;

[0021] Step 3: Pressurize: operate the first hydraulic system to make the upper and lower pressure heads clamp the weld part of the part;

[0022] Step 4, stretching: operate the second hydraulic system of the stretching mechanism to slowly move the wedge block downward so that the weld between two adjacent upper pressure heads is stretched; at the same time, measure the distance between the two adjacent upper pressure heads;

[0023] Step 5: Move the upper and lower pressure heads to other weld positions on the part, repeat steps 2, 3, and 4, and stretch the welds at other positions until the stretching of the entire weld is completed;

[0024] Step 6. Observe the stretching effect. If the welding plate of the part is still uneven, repeat steps 2, 3, 4 and 5. In this process, adjust the tensile deformation of the weld by adjusting the downward pressure of the wedge block.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] The device and method for post-weld correction of nickel alloy thin plates provided by the present invention can cause plastic strain in the weld and the area near the weld by unidirectional stretching along the weld direction at room temperature; when the plastic deformation of the weld area is large enough (that is, the weld area is stretched to the length before welding), this method can also relax the compressive stress loaded on the plate that causes it to become unstable. This method avoids the problem of poor control of manual hammering force, excessive deformation, and cracking. The plastic deformation of the weld area is controllable, and the correction and stress relief effects are better. The present invention can avoid the need to bring tooling into the furnace after welding, and can also avoid cracking caused by hammering the weld.

[0027] In summary, the technical solution of the present invention can solve the problem of "bringing tooling into the furnace" in the prior art, including the difficulty in making welding tooling, because it is necessary to consider the deformation of the tooling at high temperature to avoid new deformation of the parts caused by the high temperature strain of the tooling; it also includes the uneven cooling rate of the parts and the tooling during the cooling process, causing new deformation of the parts; it also includes the effect of heat treatment on material properties, such as the generation of harmful precipitates; and the impact on production efficiency and cost; the method of hammering the weld position, for some high-temperature alloys, such as GH4169 (Inconel 718 alloy), Inconel 750, Inconel 715 and other γ-strengthening nickel alloys, hammering can easily cause cracking.

[0028] Based on the above reasons, the present invention can be widely promoted in the fields of thin plate post-welding correction and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 It is a schematic structural diagram of the post-welding correction device for nickel alloy thin plates of the present invention.

[0031] In the figure: 1, frame; 2, workpiece; 3, upper anvil; 4, lower anvil; 5, upper pressure head; 6, lower pressure head; 7, clamping system hydraulic cylinder; 8, wedge block; 9, pressure rod; 10, stretching system hydraulic cylinder. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0036] like Figure 1 As shown, the present invention provides a device and method for post-welding correction of nickel alloy thin plates, which is a post-welding correction method and device for nickel-based high-temperature alloy thin plate parts. Nickel-based high-temperature alloy thin plates are often used in the manufacture of aircraft engine parts, but the welding process involved will introduce welding stress and deformation. Usually, the method of heating or hammering the weld with a welding tool into the furnace is adopted to correct and release stress, but heating in the furnace has an adverse effect on both materials and components, and for some high-temperature alloys, hammering can easily cause cracking. The present invention provides a method for post-welding correction of nickel-based high-temperature alloy thin plates, that is, a method and device for correction and stress release, which can avoid entering the furnace and also avoid cracking caused by hammering. The method provided by the present invention is innovative and practical, and has certain promotion value. This invention patent is expected to be promoted within the company, at home and abroad.

[0037] The present invention proposes a new method and device for post-welding correction and stress release of nickel-based high-temperature alloy thin plate weldments. The post-welding correction device for nickel alloy thin plates mainly includes: a frame 1, an upper pressure head 5, a lower pressure head 6, a clamping system and a stretching mechanism. The clamping system is installed on the frame, and its upper and lower parts are respectively connected to the upper pressure head and the lower pressure head. The part to be corrected (workpiece 2, which is a nickel alloy welding thin plate) is fixed on the frame and placed between the upper pressure head and the lower pressure head. The weld part of the part is located between two adjacent upper pressure heads / lower pressure heads. The clamping system is used to realize the upper pressure head and the lower pressure head to move closer or farther, and clamp or loosen the weld part of the part; the stretching mechanism is installed on the frame, close to the upper pressure head, and is used to drive the two adjacent upper pressure heads to move in the opposite direction, so that the weld part between the two adjacent upper pressure heads is stretched.

[0038] As a preferred embodiment, two upper rams and two lower rams are provided, the upper rams are located above the workpiece, and the lower rams are located below the workpiece, and the two upper rams are aligned one by one with the two lower rams in a direction perpendicular to the surface of the part. The upper rams and the lower rams are conical or pyramidal, and are made of alloy steel, high-speed steel or cemented carbide. In this embodiment, the cross-sectional shape of the parts of the upper rams and the lower rams connected to the clamping system is an isosceles trapezoid in opposite directions, and the first end faces of the upper rams and the lower rams connected to the clamping system are planes. The second end faces of the upper rams and the lower rams in contact with the part are processed to reduce their area, and the end faces are processed into a plane with a smaller area, and a plurality of shallow grooves are processed on the surface to increase the friction between the surface and the weld surface. Figure 1 The upper pressure head and the lower pressure head can be composed of two parts, one side of which has a cross-sectional shape of an isosceles trapezoid, and the other side of which has a cross-sectional shape of an isosceles trapezoid with a sharp bottom, and the isosceles trapezoid with a sharp bottom is approximately V-shaped.

[0039] As a preferred embodiment, the clamping system is composed of a hydraulic system (clamping system hydraulic cylinder 7), an upper anvil 3 and a lower anvil 4, including a lower anvil and two upper anvils. The hydraulic system is a manual or automatic hydraulic system, and the maximum output force of the hydraulic cylinder piston is 500kN; the system includes an oil pressure gauge. The hydraulic cylinder is installed at the bottom of the frame. The lower anvil is installed on the hydraulic cylinder piston. The upper anvil is installed on the middle plate in the middle of the frame. The upper and lower anvils are made of magnetic steel. The upper pressure head and the lower pressure head are respectively attracted by the magnetic upper and lower anvils, wherein the tops of the two upper pressure heads are respectively connected to the bottoms of the two upper anvils, and the bottoms of the two lower pressure heads are simultaneously connected to the tops of the upper anvils. Lubricating materials such as graphite or molybdenum disulfide are applied between the upper pressure head and the upper anvil, and between the lower pressure head and the lower anvil. When the hydraulic cylinder piston moves upward, the welding plate is clamped by the upper and lower pressure heads.

[0040] As a preferred embodiment, the stretching mechanism is composed of a wedge block 8, a pressure rod 9 and a hydraulic system (stretching system hydraulic cylinder 10). The wedge block is arranged between two adjacent upper pressure heads. The wedge block is wide at the top and narrow at the bottom. The pressure rod passes through the middle plate of the frame, and its lower part is connected to the wedge block, and its upper part is connected to the hydraulic cylinder piston. When the hydraulic cylinder piston moves downward, the wedge block moves downward, causing the pressure head to move to both sides (the pressure head slides between the upper and lower anvils, and the pressure head does not slide between the weld surface), and the weld is stretched along its length. Among them, through the lubricating material between the upper / lower pressure head and the upper / lower anvils, when the wedge block descends, the pressure head is moved to both sides, that is, the two pressure heads move in opposite directions away from each other.

[0041] The method for post-welding correction of a nickel-based alloy thin plate weldment using the above-mentioned welding device comprises the following steps:

[0042] (1) Preparation: Use an angle grinder, file or sandpaper to properly grind the weld to remove excess height and make the weld part flat.

[0043] (2) Clamping: Fix the parts on the frame. Align the lower surface of the weld and make it close to the lower pressure head. Align each upper pressure head with each lower pressure head.

[0044] (3) Pressurization: Operate the hydraulic system to make the upper and lower pressure heads clamp the weld part of the part.

[0045] (4) Stretching: Operate the hydraulic system of the stretching mechanism to slowly move the wedge block downward to stretch the weld between adjacent upper pressure heads. At the same time, measure the distance between adjacent upper pressure heads.

[0046] (5) Move the upper and lower pressure heads to other locations on the weld. Repeat steps (2), (3), and (4) to stretch welds at other locations until the entire weld is stretched.

[0047] (6) Observe the stretching effect. If the plate is still not flat, repeat steps (2), (3), (4), and (5). In this process, the tensile deformation of the weld can be adjusted by adjusting the downward pressure of the wedge block.

[0048] The design principle of the device and method of the present invention is: as mentioned above, the reason for the deformation of thin plate welding is that the pressure exerted on the parent material by the shrinkage of the weld and the heat-affected zone causes the thin plate to be compressed and unstable. The method of heating with the tooling into the furnace is to make the material creep and release the pressure; the method of hammering is to compress the weld and the heat-affected zone in the thickness direction, generate tensile strain in the perpendicular thickness direction, and relax the compressive stress loaded on the plate that makes it unstable. The method proposed by the present invention causes plastic strain in the weld and the area near the weld by unidirectional stretching along the weld direction at room temperature; when the plastic deformation of the weld area is large enough (that is, the weld area is stretched to the length before welding), this method can also relax the compressive stress loaded on the plate that makes it unstable. This method avoids the problem of poor control of manual hammering force, excessive deformation, and cracking. The plastic deformation of the weld area is controllable, and the correction and stress relief effects are better.

[0049] Example 1

[0050] The device and method of the present invention are used to perform electron beam welding post-welding correction of GH 4169 nickel alloy thin plates.

[0051] The thickness of the GH 4169 nickel alloy sheet is 1.25 mm. The length of the weld is about 200 mm. The excess heights of the front and back surfaces after welding are about 0.3 mm and 0.1 mm respectively. The above-mentioned device proposed by the present invention is used for post-weld correction. First, an angle grinder is used to remove most of the excess height, and then the weld is manually polished with a file to completely remove the excess height and make the weld part flat. Fix the part on the frame. Align the lower surface of the weld and approach the lower pressure head. The diameter distance between the two lower pressure heads is 20 mm. Align each upper pressure head with each lower pressure head one by one. Operate the hydraulic system. Make the upper and lower pressure heads clamp the weld part of the part. The pressure of the hydraulic system is 300 kN. Operate the hydraulic system of the stretching mechanism to move the wedge block downward. Observe that there is no relative sliding between the pressure head and the contact surface of the weld. Measure the distance between the two pressure heads. Until the distance value reaches 23 mm. At this time, the weld between the adjacent upper pressure heads is stretched and plastic deformation occurs. Move the upper and lower pressure heads to other positions of the weld. Repeat the above operation to stretch the welds in other parts until the entire weld is stretched. Observe the shape of the thin plate and find that it is still uneven, so repeat the correction. This time, the initial distance between adjacent pressure heads is still 20mm, and the wedge block is pressed down to change the distance to 21.5mm. Move the upper and lower pressure heads to other positions of the weld. Repeat the operation to stretch the welds in other parts until the entire weld is stretched again. At this time, the thin plate has become relatively flat. Complete the post-weld correction.

[0052] Example 2

[0053] The device and method of the present invention are used to perform laser welding and post-welding correction of GH 3030 nickel alloy thin plates.

[0054] The thickness of the GH 3030 nickel alloy sheet is 1 mm. The length of the weld is about 250 mm. The front and back side excess heights after welding are about 0.2 mm and 0.1 mm respectively. The above-mentioned device proposed by the present invention is used for post-weld correction. First, an angle grinder is used to remove most of the excess height, and then the weld is manually polished with a file to completely remove the excess height and make the weld part flat. Fix the parts on the frame. Align the lower surface of the weld and approach the lower pressure head. The diameter distance between the two lower pressure heads is 20 mm. Align each upper pressure head with each lower pressure head one by one. Operate the hydraulic system. Make the upper and lower pressure heads clamp the weld part of the part. The pressure output by the hydraulic system is 300 kN. Operate the hydraulic system of the stretching mechanism to move the wedge block downward. Observe that there is no relative sliding between the pressure head and the contact surface of the weld. Measure the distance between the two pressure heads. Until the distance value reaches 22 mm. At this time, the weld between the adjacent upper pressure heads is stretched and plastic deformation occurs. Move the upper and lower pressure heads to other positions of the weld. Repeat the above operation to stretch the welds in other parts until the entire weld is stretched. Observe the shape of the thin plate and find that it is still uneven, so repeat the correction. This time, the initial distance between adjacent pressure heads is still 20mm, and the wedge block is pressed down to change the distance to 22mm. Move the upper and lower pressure heads to other positions of the weld. Repeat the operation to stretch the welds in other parts until the entire weld is stretched again. At this time, the thin plate has become relatively flat. Complete the post-weld correction.

[0055] Example 3

[0056] The device and method of the present invention are used to perform post-laser welding correction of Inconel 750 nickel alloy thin plates.

[0057] The thickness of the Inconel 750 nickel alloy sheet is 0.8mm. The length of the weld is about 250mm. The front and back excess heights after welding are about 0.2mm and 0.1mm respectively. The above-mentioned device proposed by the present invention is used for post-weld correction. First, an angle grinder is used to remove most of the excess height, and then the weld is manually polished with a file to completely remove the excess height and make the weld part flat. Fix the parts on the frame. Align the lower surface of the weld and approach the lower pressure head. The diameter distance between the two lower pressure heads is 20mm. Align each upper pressure head with each lower pressure head one by one. Operate the hydraulic system. Make the upper and lower pressure heads clamp the weld part of the part. The pressure output by the hydraulic system is 200kN. Operate the stretching mechanism hydraulic system to move the wedge block downward. Observe that there is no relative sliding between the pressure head and the contact surface of the weldment. Measure the distance between the two pressure heads. Until the distance value reaches 22mm. At this time, the weld between the adjacent upper pressure heads is stretched and plastic deformation occurs. Move the upper and lower pressure heads to other positions of the weld. Repeat the above operation to stretch the welds in other parts until the entire weld is stretched. Observe the shape of the thin plate and find that it is still uneven, repeat the correction. This time, the initial distance between adjacent pressure heads is still 20mm, and the wedge block is pressed down to change the distance to 22mm. Observe the shape of the thin plate and find that it is still uneven, repeat the correction. This time, the initial distance between adjacent pressure heads is still 20mm, and the wedge block is pressed down to change the distance to 21mm. Move the upper and lower pressure heads to other positions of the weld. Repeat the operation to stretch the welds in other parts until the entire weld is stretched again. At this time, the thin plate has become relatively flat. Complete the post-weld correction.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A nickel alloy sheet post-weld correction device, characterized in that: include: A frame (1), an upper press head (5), a lower press head (6), a clamping system and a stretching mechanism, wherein the clamping system is mounted on the frame (1) and connected to the upper press head (5) and the lower press head (6) at the upper and lower parts respectively; a part to be corrected is fixed on the frame (1) and placed between the upper press head (5) and the lower press head (6); a weld portion of the part is located between two adjacent upper press heads (5) / lower press heads (6); the clamping system is used to realize the upper press head (5) and the lower press head (6) to move closer or farther away from each other, thereby clamping or loosening the weld portion of the part; the stretching mechanism is mounted on the frame (1) and is close to the upper press head (5), and is used to drive the two adjacent upper press heads (5) to move in the opposite direction, thereby stretching the weld portion between the two adjacent upper press heads (5); Two upper pressing heads (5) and two lower pressing heads (6) are provided, and the two upper pressing heads (5) and the two lower pressing heads (6) are aligned one by one in a direction perpendicular to the surface of the part; The clamping system comprises a first hydraulic system, two upper anvils (3) and a lower anvil (4); the first hydraulic system is mounted at the bottom of the frame (1), the lower anvil (4) is mounted on the first hydraulic system, the two upper anvils (3) are mounted in the middle of the frame (1), the two upper pressing heads (5) are respectively connected to the two upper anvils (3), and the two lower pressing heads (6) are connected to the lower anvil (4); the lower anvil (4) is driven up and down by the first hydraulic system so that the parts are clamped or released by the upper and lower pressing heads; lubricating material is applied between the upper pressing head (5) and the upper anvil (3), and between the lower pressing head (6) and the lower anvil (4); The stretching mechanism comprises a wedge block (8), a pressure rod (9) and a second hydraulic system, wherein the upper portion of the pressure rod (9) is connected to the second hydraulic system, the pressure rod (9) passes through the lower portion of the middle plate of the frame (1) and is connected to the wedge block (8), and the wedge block (8) is placed between two adjacent upper pressure heads (5); the wedge block (8) is driven downward by the second hydraulic system, so that the two adjacent upper pressure heads (5) move in opposite directions toward both sides, and the weld is stretched along its length direction, wherein the upper and lower pressure heads slide with the upper and lower anvils, and the pressure heads do not slide with the surface of the weld.

2. The nickel alloy sheet post-weld correction device according to claim 1, characterized in that: The upper pressure head (5) and the lower pressure head (6) are both conical or pyramidal and are made of alloy steel, high-speed steel or hard alloy; The first end faces of the upper pressing head (5) and the lower pressing head (6) connected to the clamping system are planes; the second end faces of the upper pressing head (5) and the lower pressing head (6) in contact with the parts are processed to form planes with smaller areas, and the second end faces are also processed with a plurality of shallow grooves to increase the friction between the second end faces and the surface of the weld.

3. The nickel alloy sheet post-weld correction device according to claim 1, characterized in that: The first hydraulic system is a manual or automatic hydraulic system, using a hydraulic cylinder, the lower anvil (4) is mounted on the hydraulic cylinder piston, and when the hydraulic cylinder piston moves up or down, it drives the lower anvil (4) to move up or down, so that the parts are clamped or released by the upper and lower pressure heads (6); the maximum output force of the hydraulic cylinder piston is 500kN, and the first hydraulic system includes an oil pressure gauge.

4. The nickel alloy sheet post-weld correction device according to claim 1 or 3, characterized in that: The upper anvil (3) and the lower anvil (4) are made of magnetic steel, and the upper pressure head (5) and the lower pressure head (6) are respectively attracted by the magnetic upper anvil (3) and the lower anvil (4); the lubricating material is graphite or molybdenum disulfide.

5. The nickel alloy sheet post-weld correction device according to claim 1, characterized in that: The cross-sectional shape of the wedge block (8) is a trapezoid that is wide at the top and narrow at the bottom; the second hydraulic system uses a hydraulic cylinder, and the piston of the hydraulic cylinder is connected to the upper part of the pressure rod (9).

6. A correction method for the nickel alloy sheet post-weld correction device as claimed in any one of claims 1 to 5, used for post-weld correction of nickel-based alloy sheet weldments, characterized in that: The steps include: Step 1. Preparation: Use an angle grinder, file or sandpaper to properly grind the weld to remove excess height and make the weld part flat; Step 2: Clamping: Fix the parts on the frame (1) so that the lower surface of the weld is aligned and close to the lower pressure head (6), and at the same time, each upper pressure head (5) is aligned with each lower pressure head one by one; Step 3: Pressurizing: operating the first hydraulic system so that the upper pressure head (5) and the lower pressure head (6) clamp the weld part of the part; Step 4: stretching: operating the second hydraulic system of the stretching mechanism to slowly move the wedge block (8) downward, so that the weld between two adjacent upper pressure heads (5) is stretched; at the same time, measuring the distance between the two adjacent upper pressure heads (5); Step 5, move the upper and lower pressing heads (6) to other weld positions on the part, repeat steps 2, 3, and 4, and stretch the welds at other positions until the stretching of the entire weld is completed; Step 6: Observe the stretching effect. If the weld plate of the part is still not flat, repeat steps 2, 3, 4 and 5. In this process, the tensile deformation of the weld is adjusted by adjusting the downward pressure of the wedge block (8).

Images