Preparation method of high-temperature-resistant and high-elasticity GH4169 alloy spring

Abstract

The application provides a preparation method of a high-temperature-resistant high-elasticity GH4169 alloy spring, and belongs to the technical field of spring manufacturing, and specifically comprises the following steps: raw material selection, wherein the raw material is a GH4169 alloy cold-drawing wire; winding the spring by using an automatic spring winding machine, with the winding direction being right, to obtain a spring; performing vacuum aging treatment on the spring after cleaning; rotating and extending the 1 / 4 circumference of the two ends of the spring in a plane perpendicular to the length of the spring, grinding the two end faces of the spring, so that the end face of at least 4 / 5 of the circumference of each end of the spring is perpendicular to the length direction of the spring; performing annealing treatment on the spring after cleaning; and compressing the spring to 10-15 times of the circle collision circle at room temperature. The spring quality is improved by the treatment scheme.

Description

Technical Field

[0001] This application relates to the field of spring manufacturing, and in particular to a method for preparing a high-temperature resistant, high-elasticity GH4169 alloy spring. Background Technology

[0002] Springs provide elastic force, store elastic potential energy, and perform functions such as kinetic energy conversion, displacement control, and vibration damping. They are used in components such as compressors and combustion chambers in aero-engines. The pressure springs and borescope springs in compressor components are made of GH4169 alloy wire. GH4169 alloy is a Ni-Cr-Fe based precipitation-hardening wrought superalloy with high strength and excellent fatigue resistance, oxidation resistance, and corrosion resistance.

[0003] The GH4169 alloy compression spring and borescope spring are mounted in the mounting bracket on the casing wall, serving to press the borescope plug firmly. The maximum operating temperature is around 500℃. When the engine is running, in addition to bearing high temperature and compressive load, the spring is also subjected to thermal cycling and vibration stress transmitted from the casing. Therefore, it has high requirements for dimensional accuracy and elastic stability.

[0004] The manufacturing process of GH4169 alloy springs is relatively complex. The winding and aging treatment processes are the most important and have a significant impact on product quality. If the parameters are not set properly or the analysis and inspection are not in place, the springs may fail to meet the quality and performance requirements. Summary of the Invention

[0005] In view of this, this application provides a method for preparing a high-temperature resistant and high-elasticity GH4169 alloy spring, which solves the problems in the prior art and improves the quality of the spring.

[0006] The preparation method of a high-temperature resistant and high-elasticity GH4169 alloy spring provided in this application adopts the following technical solution:

[0007] A method for preparing a high-temperature resistant, high-elasticity GH4169 alloy spring, comprising:

[0008] Step 1, Raw material selection: The raw material is GH4169 alloy cold-drawn wire;

[0009] Step 2: Use an automatic spring winding machine to wind the spring to the right to form a spring;

[0010] Step 3: After cleaning the spring, perform vacuum aging treatment;

[0011] Step 4: Rotate and extend the 1 / 4 circumference of each end of the spring in a plane perpendicular to the length of the spring, and grind the two end faces of the spring so that the end face of at least 4 / 5 circumference of each end of the spring is perpendicular to the length of the spring.

[0012] Step 5: After cleaning the spring, perform annealing treatment;

[0013] Step 6: Compress the spring at room temperature until the coil hits the coil 10-15 times.

[0014] Optionally, the preparation method also includes step 8: when the test results of the spring's elastic performance are lower than the design requirements, reduce the inner diameter of the spring, reduce the number of working coils, or increase the height of the spring within the tolerance range, and repeat steps 2-7 until the test results of the spring's elastic performance meet the design requirements.

[0015] Optionally, in step 2, the working number of spring coils is 3±0.5, the total number of coils is 4.5±0.5, the pitch is 3mm, the natural height is 14±0.5mm, and the outer diameter is 12.5mm±0.35mm.

[0016] Optionally, in step 3, the step of vacuum aging the spring includes: placing the spring in the heating furnace when the temperature of the heating furnace is not higher than 180°C; before heating, evacuating the pressure inside the heating furnace to a set value, which is less than 0.10 Pa, and maintaining the pressure below the set value during the vacuum aging process; first heating the spring to 720°C and holding it at that temperature for 8 hours; then cooling the furnace to 620°C at a rate of 50°C / h; holding the spring at 620°C for 8.5 hours; after the holding period, filling the heating furnace with 0.2-0.4 MPa of argon gas; and then removing the spring from the heating furnace after cooling it to below 50°C.

[0017] Optionally, the annealing process in step 5 includes: heating the spring to 480℃~500℃, holding it at that temperature for 60 minutes, and then cooling it in room temperature air.

[0018] Optionally, in step 1, the spring raw material is cold-drawn wire with a grain size finer than grade 6, a room temperature yield strength greater than or equal to 1035 MPa, and a Rockwell hardness greater than or equal to 36 HRC.

[0019] Optionally, the cold-drawn wire of the spring raw material undergoes bright annealing treatment. The bright annealing process is as follows: the wire is heated to 955℃, held for 30 minutes, and then cooled in room temperature air. The bright annealed wire is then subjected to aging treatment.

[0020] Optionally, the diameter deviation of the wire is -0.005mm to 0.010mm.

[0021] In summary, this application includes the following beneficial technical effects:

[0022] The GH4169 alloy spring prepared using this application has a temperature resistance of 600℃~650℃. After high-temperature use, the surface of the spring is free from oxidation, the dimensions are stable, and the elastic properties do not significantly decrease, making it suitable for use in aero engines.

[0023] The GH4169 alloy spring prepared using this application has high strength and good elasticity, which can meet the requirements of high-elasticity compression springs, and the product qualification rate is as high as 90%.

[0024] Springs prepared and tested according to this application can meet the requirements of aero-engines and ensure that they do not fail prematurely during service. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced 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.

[0026] Figure 1 This is a schematic diagram of the external structure of the spring prepared in this application.

[0027] Figure 2 This is a schematic diagram of the microstructure of the spring prepared in Example 1 of this application;

[0028] Figure 3 This is a 100x magnified microstructure diagram of the spring prepared in Example 2 of this application;

[0029] Figure 4 This is a 500x magnified microstructure diagram of the spring prepared in Example 2 of this application.

[0030] Explanation of reference numerals in the attached diagram: 1. Spring. Detailed Implementation

[0031] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0032] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0034] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0035] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0036] This application provides a method for preparing a high-temperature resistant and high-elasticity GH4169 alloy spring.

[0037] A method for preparing a high-temperature resistant, high-elasticity GH4169 alloy spring, comprising:

[0038] Step 1, Raw material selection: The raw material is GH4169 alloy cold-drawn wire.

[0039] Step 2: Use an automatic spring winding machine to wind spring 1 to the right, thus producing spring 1.

[0040] Step 3: After cleaning spring 1, perform vacuum aging treatment.

[0041] Step 4: Rotate and extend the portion of 1 / 4 circumference at both ends of spring 1 in a plane perpendicular to the length direction of spring 1, bringing the two ends of spring 1 together. Grind the two end faces of spring 1 so that at least 4 / 5 of the circumference at each end of spring 1 is perpendicular to the length direction of spring 1. After grinding, deburr the inner and outer diameters and ends of spring 1, and correct the dimensions of spring 1.

[0042] Step 5: After cleaning, spring 1 is annealed.

[0043] Step 6: Compress spring 1 at room temperature until the coil touches the coil 10-15 times to complete the standing process.

[0044] Step 7: Inspect spring 1.

[0045] The process also includes step 8, where if the test result of the elastic performance of spring 1 is lower than the design requirements, the inner diameter of the spring is reduced, the number of working coils is reduced, or the height of spring 1 is increased within the tolerance range. Steps 2-7 are repeated until the test result of the elastic performance of spring 1 meets the design requirements.

[0046] Specifically, in step 1, the raw material for spring 1 is cold-drawn wire. The grain size of the raw material is finer than grade 6, the surface is smooth, and there are no defects such as cracks, folds, burrs, or defects. The room temperature yield strength of the raw material is greater than or equal to 1035 MPa, and the Rockwell hardness is greater than or equal to 36 HRC. The wire undergoes bright annealing treatment. The bright annealing process is as follows: the wire is heated to 955℃, held at that temperature for 30 minutes, and then cooled in room temperature air. The bright annealed wire is then subjected to aging treatment. After aging treatment, the room temperature yield strength of the wire should not be less than 1035 MPa, and the hardness should not be less than 36 HRC. The diameter deviation of the wire is -0.005 mm to 0.010 mm. The above requirements are then re-inspected for the raw material.

[0047] In step 2, the working number of spring 1 is 3±0.5, the total number of coils is 4.5±0.5, the pitch is 3mm, the natural height is 14±0.5mm, and the outer diameter is 12.5mm±0.35mm.

[0048] In step 3, the wound spring 1 blank is cleaned with gasoline and dried before being subjected to vacuum aging treatment. The vacuum aging process for spring 1 includes: placing spring 1 into the heating furnace when the temperature of the heating furnace is not higher than 180°C; before heating, evacuating the pressure inside the heating furnace to a set value less than 0.10 Pa; and maintaining the pressure below the set value during the vacuum aging process; first heating spring 1 to 720°C and holding it at that temperature for 8 hours; then cooling the furnace to 620°C at a rate of 50°C / hour; holding the temperature at 620°C for 8.5 hours; after the holding period, filling the heating furnace with argon gas at 0.2-0.4 MPa; and then removing spring 1 from the heating furnace after cooling it to below 50°C.

[0049] The annealing process in step 5 includes: heating the spring 1 to 480℃~500℃, holding it at that temperature for 60 minutes, and then cooling it in room temperature air.

[0050] The inspection items in step 7 are as follows: Spring 1 should be clean and bright, free from visually visible scratches, burrs, abrasions, folds, holes, and other defects. Fluorescent detection should show no cracks or other defects. The inner and outer diameters of spring 1 should be checked using an inspection rod and inspection cylinder, and there should be no interference between the inspection rod and inspection cylinder and spring 1. The microstructure of spring 1 should be uniform, with fine grains, approximately grade 8. The natural height of spring 1 should be checked using vernier calipers, and the perpendicularity of spring 1 should be checked using a ruler and square. The elastic force of spring 1 in its prepared state should be tested using a spring tension and compression testing machine, and the elastic force of spring 1 should be tested again after 100 full compression cycles.

[0051] After all the above test results are qualified, GH4169 alloy spring 1 can be used in aero engines, mainly including compressor borescope spring, exhaust valve spring, clamping spring, etc.

[0052] The GH4169 alloy spring prepared using this application has a temperature resistance of 600℃~650℃. After high-temperature use, the surface of the spring is free from oxidation, the dimensions are stable, and the elastic properties do not significantly decrease, making it suitable for use in aero engines.

[0053] The GH4169 alloy spring prepared using this application has high strength and good elasticity, which can meet the requirements of high-elasticity compression springs, and the product qualification rate is as high as 90%.

[0054] Springs prepared and tested according to this application can meet the requirements of aero-engines and ensure that they do not fail prematurely during service.

[0055] Example 1: A method for preparing a high-temperature resistant, high-elasticity GH4169 alloy spring, comprising:

[0056] Step 1: Raw material selection. The raw material is GH4169 alloy. Spring 1 is made of Φ1.5mm cold-drawn wire with a grain size of grade 8. The cold-drawn wire undergoes bright annealing, which involves heating the wire to 955℃, holding it for 30 minutes, and then cooling it in room temperature air. The bright-annealed wire then undergoes aging treatment, which involves heating Spring 1 to 720℃ and holding it for 8 hours, then cooling the furnace to 620℃ and holding it at 620℃ for 8 hours. After holding, it is cooled in room temperature air. The room temperature yield strength of the raw material is 1189MPa~1209MPa, the Rockwell hardness is 38HRC~43HRC, and the wire diameter deviation is -0.005mm~0.010mm. The wire surface is smooth and crystalline, free from defects such as cracks, folds, burrs, and rust, and is coiled into a disc shape.

[0057] Step 2: Use an automatic spring winding machine to wind the GH4169 alloy spring 1 in the right-hand direction. The control parameters are: working number of turns 3±0.5, total number of turns 4.5±0.5, pitch 3mm, natural height 14±0.5mm, and outer diameter 12.5mm±0.35mm.

[0058] Step 3: After the wound spring 1 blank is cleaned with gasoline and dried, it undergoes vacuum aging treatment. The furnace temperature for spring 1 is room temperature. After loading into the furnace, the furnace door is closed, and the vacuum level inside the furnace is evacuated to 0.08 Pa before heating begins. The aging temperature and time are 720℃ for 8 hours, then the furnace is cooled to 620℃ at a rate of 50℃ / h, and held at 620℃ for 8.5 hours. After the holding period, argon gas at 0.2 MPa is introduced into the furnace, and after cooling to below 50℃, spring 1 is removed from the furnace.

[0059] Step 4: Extend 1 / 4 of the circumference of each end of spring 1 along a plane perpendicular to the length of spring 1, and grind the two end faces of spring 1 so that at least 4 / 5 of the circumference of each end of spring 1 is perpendicular to the length of spring 1. After grinding, deburr the inner and outer diameters and ends of spring 1, and correct the dimensions of spring 1.

[0060] Step 5: After cleaning, spring 1 undergoes annealing. Spring 1 is cleaned with gasoline and dried before annealing. The annealing process involves heating spring 1 to 480℃ and holding it at that temperature for 60 minutes, then cooling it in room temperature air.

[0061] Step 6: Compress spring 1 at room temperature until the coil touches the coil 10 times to complete the standing process.

[0062] Step 7: Inspect spring 1. The test results are shown in Table 1, and the microstructure of the spring is as follows: Figure 2 As shown.

[0063] Table 1. Spring test results in Example 1

[0064]

[0065]

[0066] Example 2: A method for preparing a high-temperature resistant, high-elasticity GH4169 alloy spring 1, comprising:

[0067] Step 1: Raw material selection. The raw material is GH4169 alloy. Spring 1 is made of Φ2.0mm cold-drawn wire with a grain size of grade 8. The cold-drawn wire undergoes bright annealing, which involves heating the wire to 955℃, holding it for 30 minutes, and then cooling it in room temperature air. The bright-annealed wire then undergoes aging treatment, which involves heating Spring 1 to 720℃ and holding it for 8 hours, then cooling the furnace to 620℃ and holding it at 620℃ for 8 hours. After holding, it is cooled in room temperature air. The room temperature yield strength of the raw material is 1225MPa~1235MPa, the Rockwell hardness is 41HRC~43HRC, and the wire diameter deviation is -0.005mm~0.010mm. The wire surface is smooth and crystalline, free from defects such as cracks, folds, burrs, and rust, and is coiled into a disc shape.

[0068] Step 2: Use an automatic spring winding machine to wind the GH4169 alloy spring 1 in the right-hand direction. The control parameters are: working turns 3.5±0.5, total turns 5±0.5, pitch 4mm, natural height 16±0.5mm, and outer diameter 12.5mm±0.30mm.

[0069] Step 3: After the wound spring 1 blank is cleaned with gasoline and dried, it undergoes vacuum aging treatment. The furnace temperature for spring 1 is room temperature. After loading into the furnace, the furnace door is closed, and the vacuum level inside the furnace is evacuated to 0.08 Pa before heating begins. The aging temperature and time are 720℃ for 8 hours, then the furnace is cooled to 620℃ at a rate of 50℃ / h, and held at 620℃ for 8.5 hours. After the holding period, argon gas at 0.4 MPa is introduced into the furnace, and spring 1 is removed from the furnace after cooling to below 50℃.

[0070] Step 4: Extend 1 / 4 of the circumference of each end of spring 1 along a plane perpendicular to the length of spring 1, and grind the two end faces of spring 1 so that at least 4 / 5 of the circumference of each end of spring 1 is perpendicular to the length of spring 1. After grinding, deburr the inner and outer diameters and ends of spring 1, and correct the dimensions of spring 1.

[0071] Step 5: After cleaning, spring 1 undergoes annealing. Spring 1 is cleaned with gasoline and dried before annealing. The annealing process involves heating spring 1 to 500℃ and holding it at that temperature for 60 minutes, then cooling it in room temperature air.

[0072] Step 6: Compress spring 1 at room temperature until the coil touches the coil 12 times to complete the standing process.

[0073] Step 7: Inspect spring 1. The test results are shown in Table 2. The microstructure of spring 1 is shown in... Figure 3 and Figure 4 As shown.

[0074] Table 2. Spring test results in Example 2

[0075]

[0076]

[0077] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for preparing a high-temperature resistant, high-elasticity GH4169 alloy spring, characterized in that, include: Step 1, Raw material selection: The raw material is GH4169 alloy cold-drawn wire; Step 2: Use an automatic spring winding machine to wind the spring to the right to form a spring; Step 3: After cleaning the spring, perform vacuum aging treatment; Step 4: Rotate and extend the 1 / 4 circumference of each end of the spring in a plane perpendicular to the length of the spring, and grind the two end faces of the spring so that the end face of at least 4 / 5 circumference of each end of the spring is perpendicular to the length of the spring. Step 5: After cleaning the spring, perform annealing treatment; Step 6: Compress the spring at room temperature until the coil touches the coil 10-15 times; In step 3, the vacuum aging process of the spring includes: placing the spring in the heating furnace when the temperature of the heating furnace is not higher than 180°C; before heating, evacuating the pressure inside the heating furnace to a set value less than 0.10 Pa; maintaining the pressure below the set value during the vacuum aging process; heating the spring to 720°C and holding it at that temperature for 8 hours; then cooling the furnace to 620°C at a rate of 50°C / h; holding the spring at 620°C for 8.5 hours; after the holding period, filling the heating furnace with 0.2-0.4 MPa of argon gas; and removing the spring from the heating furnace after cooling it to below 50°C. The annealing process in step 5 includes: heating the spring to 480℃~500℃, holding it at that temperature for 60 minutes, and then cooling it in room temperature air. In step 1, the spring raw material is cold-drawn wire with a grain size finer than grade 6, a room temperature yield strength greater than or equal to 1035 MPa, and a Rockwell hardness greater than or equal to 36 HRC.

2. The method for preparing the high-temperature resistant, high-elasticity GH4169 alloy spring according to claim 1, characterized in that, The preparation method also includes step 8, where if the test results of the spring's elastic performance are lower than the design requirements, the inner diameter of the spring is reduced, the number of working coils is reduced, or the height of the spring is increased within the tolerance range. Steps 2-7 are repeated until the test results of the spring's elastic performance meet the design requirements.

3. The method for preparing the high-temperature resistant and high-elasticity GH4169 alloy spring according to claim 1, characterized in that, In step 2, the working number of spring coils is 3±0.5, the total number of coils is 4.5±0.5, the pitch is 3mm, the natural height is 14±0.5mm, and the outer diameter is 12.5mm±0.35mm.

4. The method for preparing the high-temperature resistant and high-elasticity GH4169 alloy spring according to claim 1, characterized in that, The cold-drawn wire material of the spring raw material undergoes bright annealing treatment. The bright annealing process is as follows: the wire material is heated to 955℃, held at that temperature for 30 minutes, and then cooled in room temperature air. The bright annealed wire material is then subjected to aging treatment.

5. The method for preparing the high-temperature resistant and high-elasticity GH4169 alloy spring according to claim 4, characterized in that, The diameter deviation of the wire is -0.005 mm to 0.010 mm.

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