A heat treatment method for a GH2696 high-temperature alloy end face spring

Abstract

The application discloses a heat treatment method of a GH2696 high-temperature alloy end face spring, which comprises the following steps: vacuum solid solution treatment of a strip in a vacuum furnace; drilling and wire cutting treatment of the strip after the vacuum solid solution treatment, so as to obtain a circular ring-shaped GH2696 high-temperature alloy end face spring; pressing treatment of the circular ring-shaped GH2696 high-temperature alloy end face spring by using a hydraulic machine, so as to press a plurality of wave shapes in the circumferential direction; and vacuum aging treatment of the GH2696 high-temperature alloy end face spring installed on a clamp, so as to complete the heat treatment of the GH2696 high-temperature alloy end face spring. The end face spring is manufactured by using GH2696 iron-based high-temperature strip, the strip is sequentially subjected to vacuum solid solution treatment, primary vacuum aging treatment and secondary vacuum aging treatment, the strip is not affected by an oxidizing environment, the performance of the metal material is improved, the GH2696 high-temperature alloy end face spring has higher strength and better high-temperature elastic performance, and therefore the safety and reliability of a working component are improved, and the service life of a product is effectively prolonged.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of GH2696 high-temperature alloy end face springs and relates to a heat treatment method of a GH2696 high-temperature alloy end face spring. BACKGROUND

[0002] End face springs are widely used in mechanical seals, which are a kind of device used to solve the sealing between the rotating shaft and the machine body, and the end face spring as one of the elastic elements is widely used in aviation hydraulic pumps and aero-engines. The end face spring in the prior art has low high-temperature elastic performance, which leads to insufficient safety and reliability of the working parts, cannot guarantee that the mechanical products work for a long time below 650 DEG C, and cannot meet the product life requirements. SUMMARY

[0003] The application aims to solve the problem of low elastic performance of the end face spring for the aero-engine in the prior art, which leads to insufficient safety and reliability of the working parts, and provides a heat treatment method of a GH2696 high-temperature alloy end face spring.

[0004] To achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0005] A heat treatment method of a GH2696 high-temperature alloy end face spring, comprising the following steps:

[0006] Step one, vacuum solid solution treatment is performed on the strip in a vacuum furnace;

[0007] Step two, drilling and wire cutting treatment are performed on the strip after the vacuum solid solution treatment, and a circular ring-shaped GH2696 high-temperature alloy end face spring is obtained;

[0008] Step three, a hydraulic machine is used to perform pressing treatment on the circular ring-shaped GH2696 high-temperature alloy end face spring, and a plurality of wave shapes are pressed in the circumferential direction;

[0009] Step four, the GH2696 high-temperature alloy end face spring is installed on a clamp for one-time vacuum aging treatment and two-time vacuum aging treatment, and the heat treatment of the GH2696 high-temperature alloy end face spring is completed.

[0010] Further improvement of the application is as follows:

[0011] In the vacuum solid solution treatment in the step one, when the temperature in the vacuum furnace is below 800 DEG C, the pressure value is less than or equal to 0.13 Pa, when the temperature in the vacuum furnace is above 800 DEG C, the pressure in the vacuum furnace is divided into 1-66 Pa by using 99.999% argon, the holding temperature is (1020-1040) ± 10 DEG C, the holding time is (25-30) min, argon is filled into the vacuum furnace, and the fan is turned on to cool the parts to below 80 DEG C.

[0012] The first vacuum aging treatment of the GH2696 high-temperature alloy end face spring is performed by vacuumizing the furnace to a pressure of less than or equal to 0.13 Pa, maintaining a temperature of (750-770) ± 10 DEG C for 3-3h15min, filling argon into the vacuum furnace, and cooling the parts to below 80 DEG C by opening the fan.

[0013] The second vacuum aging treatment of the GH2696 high-temperature alloy end face spring is performed by vacuumizing the furnace to a pressure of less than or equal to 0.13 Pa, maintaining a temperature of 650 ± 10 DEG C for 3-3h15min, filling argon into the vacuum furnace, and cooling the parts to below 80 DEG C by opening the fan.

[0014] The GH2696 high-temperature alloy end face spring has a thickness of 0.25mm, a height of 6-8mm, and a width of

[0015] The GH2696 high-temperature alloy end face spring has a thickness of 0.25mm, a height of 6-8mm, and a width of

[0016] The GH2696 high-temperature alloy end face spring has a thickness of 0.25mm, a height of 6-8mm, and a width of

[0017] The vacuum furnace is loaded with N-type load thermocouples for detecting the temperature of the parts.

[0018] The vacuum furnace is loaded with two N-type load thermocouples.

[0019] The circular GH2696 high-temperature alloy end face spring has six protrusions in the circumferential direction.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] The present application provides a heat treatment method for a GH2696 high-temperature alloy end face spring, which uses GH2696 iron-based high-temperature strips to manufacture the end face spring, and sequentially performs vacuum solid solution treatment, first vacuum aging treatment and second vacuum aging treatment on the strips. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 Figure 1 is a schematic diagram of the GH2696 high-temperature alloy end face spring in the present application;

[0024] Figure 2 Figure 2 is a top view of the GH2696 high-temperature alloy end face spring in the present application;

[0025] Figure 3 Figure 3 is a sectional view along the direction A-A of the GH2696 high-temperature alloy end face spring in the present application; Figure 2

[0026] Figure 4 Figure 4 is a schematic diagram of the developed profile of the GH2696 high-temperature alloy end face spring in the present application.

[0027] In the figure, 1 is a protrusion, and 2 is an R conjugate. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0029] The following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0030] It should be noted that: similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0031] ​In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0032] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0033] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection", "connection" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] The present application provides a heat treatment method of GH2696 high-temperature alloy end face spring, a steel strip is cut off by a plate shearing machine, a through hole is drilled on the cut plate by a drilling machine, a wire is cut into a circular ring, a hydraulic machine is used to press the circular ring into a gasket with several wave shapes in the circumferential direction, a fixture is clamped for vacuum aging, the hardness of the part is detected by a microhardness tester HV0.3 scale after aging, and the elastic force value and the size of the part are detected. The end face spring is made of GH2696 iron-based high-temperature strip, and the thickness of the strip is 0.25 mm. GH2696 is a high-temperature alloy with Fe-25Ni-12Cr as a matrix, which is strengthened by a small amount of Ti, Al, Mo and a trace amount of B, has high yield strength and endurance, creep strength and good high-temperature elastic properties below 650 DEG C, gas corrosion resistance and processing plasticity. It is suitable for manufacturing blades, turbine housings and elastic elements working at (400-650) DEG C, such as end face springs for aero-engines.

[0035] The present application will be described in further detail below with reference to the drawings:

[0036] Referring to Figure 1As the schematic diagram of the GH2696 high-temperature alloy end face spring in the application, the heat treatment method of the GH2696 high-temperature alloy end face spring provided in the application specifically comprises the following steps:

[0037] Step one, vacuum solid solution treatment is performed on the strip in the vacuum furnace.

[0038] When the temperature in the vacuum furnace is below 800 DEG C, vacuum is extracted to make the pressure value in the furnace ≤0.13 Pa, when the temperature in the vacuum furnace is above 800 DEG C, 99.999% argon is used to make the pressure in the vacuum furnace be divided into 1-66 Pa, the holding temperature is (1020-1040) ± 10 DEG C, the holding time is (25-30) min, argon is filled into the vacuum furnace, the fan is opened to cool the parts to below 80 DEG C, two N-type load thermocouples are loaded in the vacuum furnace to measure the temperature of the strip. After the cold strip is vacuum solid solution treated, it is subjected to pickling and whitening treatment.

[0039] Step two, drilling and wire cutting treatment are performed on the strip after the vacuum solid solution treatment, to obtain a circular ring-shaped GH2696 high-temperature alloy end face spring.

[0040] The plate is cut off from the steel strip by a plate shearing machine, a hole is drilled through the cut-off plate by a drilling machine, and the wire cutting is circular ring-shaped.

[0041] Step three, the circular ring-shaped GH2696 high-temperature alloy end face spring is pressed by a hydraulic machine and a special mold, and a plurality of wave shapes are pressed in the circumferential direction.

[0042] Step four, the GH2696 high-temperature alloy end face spring is installed on a clamp for primary vacuum aging treatment and secondary vacuum aging treatment, to complete the heat treatment of the GH2696 high-temperature alloy end face spring.

[0043] When the GH2696 high-temperature alloy end face spring is subjected to the primary vacuum aging treatment, vacuum is extracted to make the pressure in the furnace ≤0.13 Pa, the holding temperature is (750-770) ± 10 DEG C, the holding time is 3-3h15min, argon is filled into the vacuum furnace, the fan is opened to cool the parts to below 80 DEG C, and two N-type load thermocouples are loaded in the vacuum furnace to measure the temperature of the parts.

[0044] When the GH2696 high-temperature alloy end face spring is subjected to the secondary vacuum aging treatment, vacuum is extracted to make the pressure in the furnace ≤0.13 Pa, the holding temperature is 650 ± 10 DEG C, the holding time is 3-3h15min, argon is filled into the vacuum furnace, the fan is opened to cool the parts to below 80 DEG C, and two N-type load thermocouples are loaded in the vacuum furnace to measure the temperature of the parts.

[0045] After the heat treatment of the GH2696 high-temperature alloy end face spring, the hardness is detected by a microhardness tester HV0.3 scale, and the hardness requirement is (340-454) HV, to ensure the elasticity requirement of the part.

[0046] After the heat treatment, the actual hardness value of the GH2696 high-temperature alloy end face spring is 366 HV0.3, 399 HV0.3 and 384 HV0.3, the hardness requirement value is (340-454) HV, the compression is 1.8 mm, and the elastic force value is 62 N.

[0047] Embodiment

[0048] Reference Figures 2-4 The GH2696 high-temperature alloy end face spring has a thickness of 0.25 mm, a height of (7±1) mm, and a width of The compression is 1.8 mm, the elastic force is (60±10) N or ((6±1) kgf), the convex and concave high points in the spring deviate from the planes A and B in the drawing by no more than 0.5 mm, the height of the spring in a free state is 6-8 mm, the transition arc of the spring is smooth and has no recess. Figure 3 The heat treatment of the GH2696 high-temperature alloy end face spring is performed by the following steps:

[0049] Vacuum solid solution treatment: the pressure value in the vacuum furnace below 800°C is ≤0.13 Pa, the pressure in the vacuum furnace above 800°C is divided into 30 Pa by using argon with a purity of 99.999%, the holding temperature is 1030±10°C, the holding time is 28 min, the part is cooled to below 70°C by air cooling through argon fan cooling, and two N-type load thermocouples are loaded in the vacuum furnace to measure the temperature of the strip.

[0050] The steel strip is cut by a plate shearing machine, a through hole is drilled on the cut plate by a drilling machine, the wire is cut into a circular ring, the circular ring is pressed into a gasket with a plurality of wave shapes along the circumferential direction by a hydraulic machine, and a fixture is clamped for vacuum aging treatment.

[0051] First vacuum aging treatment: the pressure in the vacuum furnace is 0.1 Pa, the holding temperature is (760±10) °C, the holding time is 3h10min, argon is filled to open the fan to cool the part to below 70°C by air cooling, and two N-type load thermocouples are loaded in the vacuum furnace to measure the temperature of the part.

[0052] Second vacuum aging treatment: the pressure in the vacuum furnace is 0.10 Pa, the holding temperature is (650±10) °C, the holding time is 3h10min, argon is filled to open the fan to cool the part to below 70°C by air cooling, and two N-type load thermocouples are loaded in the vacuum furnace to measure the temperature of the part.

[0053] The actual hardness values are 366 HV0.3, 399 HV0.3, 384 HV0.3, the hardness requirement value (340-454) HV, compression to 1.8 mm, and the elastic force value is 62 N.

[0054] The preferred embodiments of the present application have been described above with the preferred embodiments, but the present application is not limited to the above examples, and various modifications and changes can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method of heat treating a GH2696 high temperature alloy end face spring, characterized by, It comprises the following steps: Step one, vacuum solid solution treatment of the strip in the vacuum furnace; Step two, drilling and wire cutting treatment of the strip after vacuum solid solution treatment, to obtain a circular GH2696 high-temperature alloy end face spring; Step three, pressing treatment of the circular GH2696 high-temperature alloy end face spring by a hydraulic press, to press several wave shapes in the circumferential direction; Step four, mounting the GH2696 high-temperature alloy end face spring on a clamp for primary vacuum aging treatment and secondary vacuum aging treatment, to complete the heat treatment of the GH2696 high-temperature alloy end face spring; In the step one, when the vacuum solid solution treatment is performed, the pressure value is ≤0.13 Pa when the temperature in the vacuum furnace is below 800℃, and the pressure in the vacuum furnace is divided to 1-66 Pa by using 99.999% argon when the temperature in the vacuum furnace is above 800℃, the holding temperature is 1020-1040℃, the holding time is (25-30) min, argon is filled into the vacuum furnace, and the fan is turned on to cool the parts to below 80℃; In the primary vacuum aging treatment of the GH2696 high-temperature alloy end face spring, the furnace pressure is ≤0.13 Pa after vacuumizing, the holding temperature is 750-770℃, the holding time is 3h-3h15min, argon is filled into the vacuum furnace, and the fan is turned on to cool the parts to below 80℃; The GH2696 high-temperature alloy end face spring has a thickness of 0.25 mm, a height of 6-8 mm, and a width of .

2. A method of heat treating a GH2696 high temperature alloy end face spring as recited in claim 1, wherein, In the secondary vacuum aging treatment of the GH2696 high-temperature alloy end face spring, the furnace pressure is ≤0.13 Pa after vacuumizing, the holding temperature is 650±10℃, the holding time is 3h-3h15min, argon is filled into the vacuum furnace, and the fan is turned on to cool the parts to below 80℃.

3. A method of heat treating a GH2696 high temperature alloy end face spring as recited in claim 1 wherein, The GH2696 high-temperature alloy end face spring is compressed to 1.8mm, and the elastic force is 60±10N.

4. The method of heat treating a GH2696 high temperature alloy end face spring of claim 1, wherein, After the heat treatment of the GH2696 high-temperature alloy end face spring is completed, the hardness is detected by using a microhardness tester HV0.3 scale.

5. A method of heat treating a GH2696 high temperature alloy end face spring as recited in claim 1 wherein, The vacuum furnace is loaded with N-type load thermocouples for detecting the temperature of the parts.

6. A method of heat treating a GH2696 high temperature alloy end face spring as recited in claim 5 wherein, The number of N-type load thermocouples loaded in the vacuum furnace is two.

7. A method of heat treating a GH2696 high temperature alloy end face spring as recited in claim 1 wherein, The wave shape of the circular GH2696 high-temperature alloy end face spring in the circumferential direction comprises six protrusions.

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