Stress relief annealing method for winding resistance wire on metal component

Abstract

The invention discloses a stress relief annealing method for winding a resistance wire on a metal component. The stress relief annealing method comprises the following steps: winding the resistance wire on a stress relief area on the peripheral surface of a to-be-treated metal component; the peripheral surface of the to-be-treated metal component is wrapped with a heat preservation layer covering the resistance wire; the to-be-treated metal component is installed in a cooling container, a cooling medium is injected into the cooling container, and local cooling treatment is conducted on the to-be-treated metal component through the cooling medium; and electrifying the resistance wire to heat the metal component to be treated. The stress relief annealing method for winding the resistance wire on the metal component can be more efficient, accurate and suitable for stress relief annealing treatment of various metal components such as titanium alloy components, especially complex-shape and large-scale metal components, the requirements of the modern industrial field for high performance and high quality of the titanium alloy components are met, and then industrial development is promoted.

Description

Technical Field

[0001] This application relates to the field of metal material processing technology, and in particular to a method for stress-relieving annealing of metal components by winding resistance wire. Background Technology

[0002] In fields such as shipbuilding and marine engineering equipment, metal components, such as titanium alloys, nickel alloys, and aluminum alloys, are widely used in the manufacturing of various key components due to their excellent mechanical properties and corrosion resistance. However, during the processing and manufacturing of metal components, whether through machining, welding, or other processes, residual stress is inevitably generated within them. The presence of residual stress negatively impacts the performance and service life of metal components. On the one hand, residual stress can lead to dimensional instability during use, potentially causing deformation over time and making it difficult to meet the stringent dimensional accuracy requirements of precision equipment. On the other hand, higher residual stress reduces the fatigue strength of metal components. Under alternating loads, metal components are more prone to fatigue cracks, leading to fracture failure. This is extremely detrimental to critical metal components subjected to cyclic loads, seriously threatening the safety and reliability of equipment operation.

[0003] Stress-relief annealing is an effective means of reducing residual stress in metal components, such as titanium alloy components. The traditional method involves placing the entire metal component in a high-temperature furnace for heating and holding, followed by slow cooling. While this method can reduce residual stress to some extent, it also has several drawbacks. For example, for metal components with complex shapes and large dimensions, the uneven temperature distribution within the furnace and differences in heat dissipation across different parts of the component during the overall heating process make it difficult to achieve a uniform annealing effect, resulting in insufficient stress removal in some areas. Furthermore, overall annealing requires modifications to large equipment to accommodate large metal components, and the high energy consumption during heating and cooling significantly increases production costs. In addition, for some already assembled integral structures or localized metal components, traditional overall annealing methods are difficult to operate and have low feasibility, often requiring disassembly of the metal component before processing, which undoubtedly increases process complexity and processing time.

[0004] In traditional technologies, some studies have attempted to use local heating methods, such as using flame heating or induction heating to process specific parts of metal components. However, flame heating has problems such as low temperature control precision, difficulty in accurately controlling the heating area, and easy to cause severe surface oxidation. Although induction heating has a faster heating speed, the design and manufacturing of induction coils are more difficult for complex-shaped metal components, and local overheating may occur due to eddy current effects during the heating process, which also cannot guarantee the annealing quality. Summary of the Invention

[0005] Therefore, it is necessary to provide a more efficient, accurate, and applicable method for stress-relieving annealing of metal components by winding resistance wire, which is suitable for various metal components such as titanium alloy components, especially complex-shaped and large metal components.

[0006] One embodiment of this application provides a stress-relief annealing method for winding resistance wire around metal components.

[0007] A method for stress-relieving annealing of metal components by winding resistance wire includes the following steps:

[0008] A resistance wire is wound around each stress-relief region on the outer peripheral surface of the metal component to be treated;

[0009] An insulation layer is wrapped around the outer periphery of the metal component to be processed, covering the resistance wire;

[0010] The metal component to be treated is installed into a cooling container, and a cooling medium is injected into the cooling container to perform local cooling treatment on the metal component to be treated through the cooling medium.

[0011] In addition, the resistance wire is energized to heat the metal component to be processed.

[0012] In some embodiments, the stress-relief annealing method for winding resistance wire around a metal component further includes the following step: cleaning the outer peripheral surface of the metal component to be treated with a solvent before winding the resistance wire.

[0013] In some embodiments, the solvent includes alcohol.

[0014] In some embodiments, the stress-relief annealing method for winding resistance wire around a metal component further includes the following step: connecting a plurality of metal positioning blocks of the same material as the metal component to be processed to the outer peripheral surface of the metal component to be processed, the metal positioning blocks being used to support the resistance wire.

[0015] In some embodiments, the method for stress-relief annealing of metal components by winding resistance wire further includes the following step: connecting a metal positioning ring of the same material as the metal component to be treated to the outer peripheral surface of the metal component to be treated, the metal positioning ring being used to support the insulation layer.

[0016] In some embodiments, the method for stress-relief annealing of metal components by winding resistance wire further includes the following step: connecting an angle iron of the same material as the metal component to be treated to the outer peripheral surface of the metal component to be treated, the angle iron being used for thermocouple connection.

[0017] In some embodiments, the insulation layer is made of aluminum silicate fiber blanket insulation cotton.

[0018] In some embodiments, the thickness of the insulation layer is 40mm to 80mm.

[0019] In some embodiments, the insulation layer completely covers the outer peripheral surface of the metal component to be treated.

[0020] In some embodiments, the method for stress-relieving annealing of metal components by winding resistance wire further includes the following step: binding a high-temperature resistant fixing rope to the outer surface of the insulation layer.

[0021] In some embodiments, the number of layers of the resistance wire wound around each stress-relief region on the outer peripheral surface of the metal component to be treated is 4 to 5, and the width of the heating zone formed by the resistance wire in each stress-relief region is 48 mm to 60 mm.

[0022] In some embodiments, the resistance wires between adjacent stress-relief regions on the outer peripheral surface of the metal component to be treated are isolated from each other.

[0023] In some embodiments, the resistance wire comprises a ceramic resistance wire.

[0024] In some embodiments, when energizing the resistance wire to heat the metal component to be processed, the following steps are included:

[0025] A stepped platform heating method is adopted, with each heating platform holding for 15-40 minutes. After reaching the set holding temperature, the holding time is 120-300 minutes. Then, a stepped platform cooling method is adopted, with each cooling platform holding for 15-20 minutes.

[0026] The resistance wire is de-energized and allowed to cool naturally to 20°C~30°C.

[0027] In some embodiments, when the metal component to be treated is locally cooled by the cooling medium, the following steps are included: during the heating, heat preservation and cooling processes, the bottom surface temperature of the metal component to be treated is controlled to be ≤200°C by the cooling medium in the cooling container.

[0028] In some embodiments, the cooling container includes a cooling cylinder with a top opening and a pad disposed inside the cooling cylinder. The pad is used to support the metal component to be treated. An observation window and a drain outlet are provided on the side wall of the cooling cylinder, and a drain control valve is provided at the drain outlet.

[0029] In some embodiments, the side wall of the cooling cylinder is provided with a number of lifting lugs.

[0030] In some embodiments, the cooling cylinder includes a bottom plate and an annular side plate connected to the bottom plate.

[0031] The aforementioned method for stress-relief annealing of metal components using resistance wire winding is more efficient, precise, and applicable to various metal components such as titanium alloy and nickel alloy components, especially complex-shaped and large metal components. It meets the high-performance and high-quality requirements of modern industry for titanium alloy components, thereby promoting industrial development. This application solves the problems of high energy consumption, low temperature control accuracy, and difficulty in precisely controlling the heating area in traditional stress-relief annealing techniques. It achieves efficient and precise stress-relief annealing of metal components, such as titanium alloy components, especially complex-shaped and large components, improving the dimensional stability and fatigue strength of metal components, thus enhancing equipment reliability. The method of this application involves winding resistance wire around the stress-relief area of ​​the metal component, such as the weld seam. The heat generated by energizing the resistance wire uniformly heats the stress-relief area of ​​the metal component while maintaining local water cooling. Combined with precise temperature control and annealing processes, it achieves the goal of accurately reducing local residual stress in the metal component. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0033] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0034] Figure 1 This is a schematic diagram of the stress-relieving annealing method for winding resistance wire around a metal component according to an embodiment of this application;

[0035] Figure 2 This is a schematic diagram of the metal component to be processed according to an embodiment of this application;

[0036] Figure 3 This is a schematic diagram of the metal component to be processed according to an embodiment of this application, including the winding of resistance wire and the insulation layer;

[0037] Figure 4 This is a schematic diagram of the cooling container structure according to an embodiment of this application;

[0038] Figure 5 This is a schematic diagram illustrating the fit between the metal component to be processed and the cooling container structure according to an embodiment of this application.

[0039] Explanation of reference numerals in the attached figures

[0040] 100. Metal component to be processed; 101. Weld; 200. Cooling container; 210. Cooling cylinder; 211. Base plate; 212. Side plate; 201. Observation window; 202. Drain outlet; 203. Drain control valve; 220. Pad; 230. Lifting lug; 300. Resistance wire; 400. Insulation layer; 510. Metal positioning block; 520. Metal positioning ring; 530. Vertical positioning block; 540. Angle iron; 600. Control cabinet. Detailed Implementation

[0041] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0042] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0046] In this document, "optionally," "optionally," and "optional" mean that something is optional, that is, it is selected from either "with" or "without." If multiple "options" appear in a technical solution, unless otherwise specified and there are no contradictions or mutual constraints, each "option" is independent. In this application, descriptions such as "optionally contains" and "optionally includes" indicate "contains or does not contain."

[0047] In this document, unless otherwise stated, the reaction steps may be performed in the order described herein or not. For example, other steps may be included between reaction steps, and the order of reaction steps may be appropriately interchanged. This is something that those skilled in the art can determine based on conventional knowledge and experience. Preferably, the reaction methods described herein are performed sequentially.

[0048] In this application, when numerical intervals (i.e., numerical ranges) are mentioned, unless otherwise specified, the distribution of selectable numerical values ​​within the numerical interval is considered continuous, and includes the two endpoints of the numerical interval (i.e., the minimum and maximum values), as well as every numerical value between these two endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that numerical interval, it includes the two endpoint integers of the numerical range, as well as every integer between the two endpoints, which is equivalent to directly listing every integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical ranges disclosed in this application should be understood to include any and all subranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, percentage, ratio, etc. The term "numerical interval" can be broadly included to include percentage intervals, ratio intervals, proportion intervals, etc.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0050] This application provides a method for stress-relief annealing of metal components by winding resistance wire, which solves at least one of the following technical problems in the processing of metal components in the conventional technology: (1) For metal components with complex shapes and large sizes, it is difficult to achieve a uniform annealing effect during the overall heating process, resulting in insufficient removal of residual stress in some areas. (2) Overall annealing requires the modification of large equipment to accommodate large-sized metal components, and the energy consumption during heating and cooling is high, leading to a significant increase in production costs. (3) For some metal components with already assembled overall structures or local areas, the traditional overall annealing method has problems such as high operational difficulty and low feasibility. (4) Using local heating methods, such as flame heating or induction heating, to process specific parts of metal components has problems such as low temperature control accuracy, difficulty in accurately controlling the heating area, and easy to cause severe surface oxidation. (5) For metal components with complex shapes, local overheating may occur due to eddy current effect during induction heating, which also cannot guarantee the annealing quality. The following will describe the method for stress-relief annealing of metal components by winding resistance wire with the accompanying drawings.

[0051] This application provides an embodiment of a stress-relief annealing method for winding resistance wire around metal components. For an example, please refer to [link to relevant documentation]. Figure 1 As shown, Figure 1This is a schematic flowchart of a stress-relief annealing method for winding resistance wire around a metal component, as provided in one embodiment of this application. The stress-relief annealing method for winding resistance wire around a metal component according to this application can be used to remove residual stress from metal components, such as titanium alloy components.

[0052] To more clearly illustrate the structure of the stress-relief annealing method for winding resistance wire around metal components, the following will introduce the stress-relief annealing method for winding resistance wire around metal components with reference to the accompanying drawings.

[0053] For example, please refer to Figure 1 As shown, a method for stress-relieving annealing of metal components by winding resistance wire includes the following steps:

[0054] S10, each stress-relief region on the outer peripheral surface of the metal component 100 to be treated (see...) Figure 2 As shown, Figure 2 This is a schematic diagram of a metal component 100 to be processed according to an embodiment of this application. The stress-relief area of ​​the metal component 100 to be processed is the weld 101) around which the resistance wire 300 is wound.

[0055] S20. Wrap a heat insulation layer 400 covering the resistance wire 300 around the outer periphery of the metal component 100 to be treated. See below. Figure 3 As shown, Figure 3 This is a schematic diagram of a metal component 100 to be processed according to an embodiment of this application, with a resistance wire 300 and an insulation layer 400 wound around it.

[0056] S30. Install the metal component 100 to be processed into the cooling container 200. (See below) Figure 4 As shown, Figure 4 This is a schematic diagram of the structure of a cooling container 200 according to an embodiment of this application. A cooling medium is injected into the cooling container 200 to perform local cooling treatment on the metal component 100 to be treated.

[0057] S40. Electrify the resistance wire 300 to heat the metal component 100 to be processed. See below. Figure 5 As shown, Figure 5 This is a schematic diagram of the structural cooperation between the metal component 100 to be processed and the cooling container 200 according to an embodiment of this application.

[0058] The method of this application involves wrapping a resistance wire 300 around a stress-relief area on the surface of a metal component, such as a titanium alloy component, for example, at weld 101. The heat generated by energizing the resistance wire 300 is used to uniformly heat the stress-relief area of ​​the metal component while maintaining local water cooling. Combined with precise temperature control and annealing process, this achieves the purpose of accurately reducing local residual stress in the metal component.

[0059] In some embodiments, the stress-relief annealing method for winding resistance wire around a metal component further includes the following step: before winding the resistance wire 300, cleaning the outer peripheral surface of the metal component 100 to be treated with a solvent. Cleaning can remove some impurities from the surface of the metal component 100 to be treated, thereby improving the stress-relief effect.

[0060] In some of these embodiments, the solvent includes alcohol.

[0061] In some embodiments, the stress-relief annealing method for winding resistance wire around a metal component further includes the following steps: connecting a plurality of metal positioning blocks 510 of the same material as the metal component 100 to be processed on the outer peripheral surface of the metal component 100 to be processed, the metal positioning blocks 510 being used to support the resistance wire 300.

[0062] For example, when the stress-relief area of ​​the metal component 100 to be treated is weld 101, see [reference needed]. Figure 2 As shown, the metal component 100 to be processed has two circumferentially extending welds 101. TC4 titanium alloy horizontal positioning blocks are welded 20mm~40mm from the upper edge of the lower weld 101 on the outer circumferential surface of the metal component 100. These horizontal positioning blocks are spaced apart circumferentially along the outer circumferential surface of the metal component 100, with adjacent horizontal positioning blocks spaced 350mm~450mm apart. Multiple horizontal positioning blocks are welded 20mm~40mm from the lower edge of the upper weld 101. The dimensions of the horizontal positioning blocks are 20mm~30mm (length) × 20mm~40mm (width) × 3mm~8mm (thickness).

[0063] In some embodiments, the stress-relief annealing method for winding resistance wire around a metal component further includes the following steps: connecting a metal positioning ring 520 of the same material as the metal component 100 to the outer peripheral surface of the metal component 100 to be treated, the metal positioning ring 520 being used to support the insulation layer 400.

[0064] For example, when the stress-relief area of ​​the metal component 100 to be treated is weld 101, see [reference needed]. Figure 2 As shown, a steel positioning ring is fitted onto the outer circumference of the metal component 100 to be processed. Then, 3 to 5 TC4 titanium alloy vertical positioning blocks 530 are welded to the bottom of the positioning ring to fix the positioning ring. The dimensions of the vertical positioning blocks 530 are 20mm to 30mm (length) × 20mm to 40mm (width) × 3mm to 8mm (thickness), and the vertical positioning blocks 530 extend along the vertical direction.

[0065] In some embodiments, the stress-relief annealing method for winding resistance wire around a metal component further includes the following steps: connecting an angle iron 540 of the same material as the metal component 100 to the outer peripheral surface of the metal component 100 to be treated, the angle iron 540 being used for thermocouple connection.

[0066] For example, when the stress-relief area of ​​the metal component 100 to be treated is weld 101, see [reference needed]. Figure 2 As shown, a TC4 titanium alloy angle iron 540 with a length of 100mm~120mm × 30mm~40mm × 3mm~8mm (thickness) is welded at the vertical midpoint of the upper and lower welds 101. The angle iron 540 has an inclination angle of 5°~10°, and the position of the angle iron 540 is marked.

[0067] In some embodiments, the insulation layer 400 is made of aluminum silicate fiber blanket insulation cotton. After the insulation layer 400 is in place, a resistance wire 300 connector is led out from the insulation layer 400 for connecting to an external control cabinet 600.

[0068] In some embodiments, the thickness of the insulation layer 400 is 40mm to 80mm. The thickness of the insulation layer 400 includes, but is not limited to, 40mm, 50mm, 60mm, 70mm, 80mm or any range between the two mentioned above.

[0069] In some embodiments, the insulation layer 400 fully covers the outer peripheral surface of the metal component 100 to be treated.

[0070] In some embodiments, the method for stress-relieving annealing of metal components by winding resistance wire further includes the following step: binding a high-temperature resistant fixing rope to the outer surface of the insulation layer 400.

[0071] In some embodiments, each stress-relief region (e.g., at weld 101) on the outer peripheral surface of the metal component 100 is wound with 4 to 5 layers of resistance wire 300, and the width of the heating zone formed by the resistance wire 300 in each stress-relief region (e.g., at weld 101) is 48 mm to 60 mm.

[0072] In some embodiments, the resistance wires 300 are isolated from each other between adjacent stress-relief areas (e.g., at weld 101) on the outer peripheral surface of the metal component 100 to be treated. This ensures that the resistance wires 300 are in close contact with the metal component 100 to be treated, avoiding situations such as stacking, tangling, and overlapping of the resistance wires 300 that could easily lead to short circuits.

[0073] In some embodiments, the resistance wire 300 includes a ceramic resistance wire 300.

[0074] In some embodiments, when the resistance wire 300 is energized to heat the metal component 100 to be processed, the following steps are included:

[0075] A stepped platform heating method is adopted, with each heating platform holding for 15-40 minutes. After reaching the set holding temperature, the holding time is 120-300 minutes. Then, a stepped platform cooling method is adopted, with each cooling platform holding for 15-20 minutes.

[0076] The resistance wire is de-energized and allowed to cool naturally to 20°C~30°C.

[0077] In some embodiments, when the resistance wire 300 is energized to heat the metal component 100 to be processed, the following steps are included:

[0078] Heat to 150℃~160℃ and hold for 15min~20min;

[0079] Heat to 300℃~320℃ and hold for 15min~20min;

[0080] Heat to 400℃~420℃ and hold for 30min~40min;

[0081] Heat to 500℃~510℃ and hold for 30min~40min;

[0082] Heat to 540℃~550℃ and hold for 120min~300min;

[0083] Cool down to 440℃~450℃ and keep warm for 15min~20min;

[0084] Cool down to 400℃~410℃ and keep warm for 15min~20min;

[0085] Cool down to 350℃~360℃ and keep warm for 15min~20min;

[0086] Cool down to 300℃~310℃, then keep warm for 15min~20min;

[0087] Disconnect the power to the 300 resistance wire and allow it to cool naturally to 20℃~30℃.

[0088] In one specific embodiment, when energizing the resistance wire 300 to heat the metal component 100 to be processed, the following steps are included:

[0089] Heat to 155℃ and hold for 18 minutes;

[0090] Heat to 310℃ and hold for 18 minutes;

[0091] Heat to 410℃ and hold for 35 minutes;

[0092] Heat to 505℃ and hold for 35 minutes;

[0093] Heat to 545℃ and hold for 130 minutes;

[0094] Cool down to 445℃ and hold for 18 minutes;

[0095] Cool down to 405℃ and hold for 18 minutes;

[0096] Cool down to 355℃ and hold for 18 minutes;

[0097] Cool down to 305℃ and hold for 18 minutes;

[0098] Disconnect the power to the 300 resistance wire and allow it to cool naturally to 25°C.

[0099] In some embodiments, when the metal component 100 to be treated is locally cooled by the cooling medium, the following steps are included: during the heating, heat preservation and cooling processes, the bottom surface temperature of the metal component 100 to be treated is controlled to be ≤200°C by the cooling medium in the cooling container 200.

[0100] In some implementations, see Figure 4 As shown, the cooling container 200 includes a cooling cylinder 210 with a top opening and a pad 220 disposed inside the cooling cylinder 210. The pad 220 is used to support the metal component 100 to be processed. An observation window 201 and a drain port 202 are provided on the side wall of the cooling cylinder 210, and a drain control valve 203 is provided at the drain port 202.

[0101] In some embodiments, the drain port 202 is the bottom of the cooling cylinder 210.

[0102] In some implementations, see Figure 4 As shown, the cooling cylinder 210 has several lifting lugs 230 on its side wall. Using the lifting lugs 230 and power equipment, the cooling cylinder 210 can be hoisted and placed in an open and flat area that is convenient for wiring the control cabinet 600. Adjust the height of the cooling cylinder 210 and keep it horizontal. Then, hoist the metal component 100 to be treated, which has been covered with the insulation layer 400, into the cooling cylinder 210, ensuring that the metal component 100 to be treated is placed stably. Observe the injected cooling medium to the appropriate water level through the observation window 201.

[0103] In some of these implementations, the cooling medium includes water.

[0104] In some implementations, see Figure 4 As shown, the cooling cylinder 210 includes a bottom plate 211 and an annular side plate 212, with the side plate 212 connected to the bottom plate 211.

[0105] In some embodiments, after stress-relief annealing is completed, the vertical positioning block 530, horizontal positioning block and angle iron 540 welded to the surface of the metal component are removed, and the weld points are mechanically ground off. Then, they are wiped clean with alcohol solvent, and the oxidation of the surface of the weld 101 of the metal component is observed. No excessive oxidation has occurred in the weld 101 and the surrounding area. The internal cavity of the metal component is observed with an industrial endoscope. The lead plate has not melted, and the local heat treatment of the surface is completed.

[0106] In summary, the aforementioned method for stress-relief annealing of metal components using resistance wire winding offers a more efficient, precise, and applicable approach to stress-relief annealing of various metal components, such as titanium alloy and nickel alloy components, particularly complex-shaped and large metal components. This method meets the high-performance and high-quality requirements of modern industry for titanium alloy components, thereby promoting industrial development. This application solves the problems of high energy consumption, low temperature control accuracy, and difficulty in precisely controlling the heating zone inherent in traditional stress-relief annealing techniques. It achieves efficient and precise stress-relief annealing of metal components, such as titanium alloy components, especially complex-shaped and large components, improving the dimensional stability and fatigue strength of the metal components, thus enhancing equipment reliability.

[0107] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0108] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0109] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for stress-relieving annealing of metal components by winding resistance wire, characterized in that, Includes the following steps: Resistance wire is wound around the stress-relief area on the outer peripheral surface of the metal component to be treated; An insulation layer is wrapped around the outer periphery of the metal component to be processed, covering the resistance wire; The metal component to be treated is installed into a cooling container, and a cooling medium is injected into the cooling container to perform local cooling treatment on the metal component to be treated through the cooling medium. In addition, the resistance wire is energized to heat the metal component to be processed.

2. The method for stress-relieving annealing of metal components by winding resistance wire according to claim 1, characterized in that, The method for stress-relief annealing of metal components by winding resistance wire further includes the following steps: before winding the resistance wire, the outer peripheral surface of the metal component to be treated is cleaned with a solvent; Optionally, the solvent includes alcohol.

3. The method for stress-relieving annealing of metal components by winding resistance wire according to claim 1, characterized in that, The stress-relief annealing method for winding resistance wire around metal components also satisfies at least one of the following conditions: (1) The stress relief annealing method for winding resistance wire around a metal component further includes the following steps: connecting multiple metal positioning blocks of the same material as the metal component to be processed to the outer peripheral surface of the metal component to be processed, wherein the metal positioning blocks are used to support the resistance wire; (2) The stress relief annealing method for winding resistance wire around a metal component further includes the following steps: connecting a metal positioning ring of the same material as the metal component to be treated to the outer circumferential surface of the metal component to be treated, wherein the metal positioning ring is used to support the insulation layer.

4. The method for stress-relieving annealing of metal components by winding resistance wire according to claim 1, characterized in that, The method for stress-relief annealing of metal components by winding resistance wire further includes the following steps: connecting an angle iron of the same material as the metal component to be treated to the outer peripheral surface of the metal component to be treated, wherein the angle iron is used for thermocouple connection.

5. The method for stress-relieving annealing of metal components by winding resistance wire according to claim 1, characterized in that, The stress-relief annealing method for winding resistance wire around metal components also satisfies at least one of the following conditions: (1) The material of the insulation layer is aluminum silicate fiber blanket insulation cotton; (2) The thickness of the insulation layer is 40mm~80mm; (3) The insulation layer fully covers the outer periphery of the metal component to be treated.

6. The method for stress-relieving annealing of metal components by winding resistance wire according to any one of claims 1 to 5, characterized in that, The method for stress-relief annealing of metal components by winding resistance wire further includes the following step: binding a high-temperature resistant fixing rope to the outer surface of the insulation layer.

7. The method for stress-relieving annealing of metal components by winding resistance wire according to any one of claims 1 to 5, characterized in that, The stress-relief annealing method for winding resistance wire around metal components also satisfies at least one of the following conditions: (1) The number of layers of the resistance wire wound around each stress relief region on the outer peripheral surface of the metal component to be treated is 4 to 5, and the width of the heating zone formed by the resistance wire in each stress relief region is 48 mm to 60 mm. (2) The resistance wires between adjacent stress-relief regions on the outer peripheral surface of the metal component to be treated are isolated from each other; (3) The resistance wire includes ceramic resistance wire.

8. The method for stress-relieving annealing of metal components by winding resistance wire according to any one of claims 1 to 5, characterized in that, When energizing the resistance wire to heat the metal component to be processed, the following steps are included: A stepped platform heating method is adopted, with each heating platform holding for 15-40 minutes. After reaching the set holding temperature, the holding time is 120-300 minutes. Then, a stepped platform cooling method is adopted, with each cooling platform holding for 15-20 minutes. The resistance wire is de-energized and allowed to cool naturally to 20°C~30°C.

9. The method for stress-relieving annealing of metal components by winding resistance wire according to any one of claims 1 to 5, characterized in that, When the metal component to be treated is locally cooled using the cooling medium, the following steps are included: during the heating, heat preservation and cooling processes, the bottom surface temperature of the metal component to be treated is controlled to be ≤200℃ by the cooling medium in the cooling container.

10. The method for stress-relieving annealing of metal components by winding resistance wire according to any one of claims 1 to 5, characterized in that, The cooling container includes a cooling cylinder with a top opening and a pad disposed inside the cooling cylinder. The pad is used to support the metal component to be treated. An observation window and a drain outlet are provided on the side wall of the cooling cylinder, and a drain control valve is provided at the drain outlet. Optionally, the side wall of the cooling cylinder is provided with a plurality of lifting lugs; Optionally, the cooling cylinder includes a bottom plate and an annular side plate, the side plate being connected to the bottom plate.

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