Strengthening method and strengthening treatment device for valve element

Abstract

The invention provides a strengthening method and strengthening treatment device for a valve element. The strengthening method comprises the steps that the valve element is heated to the target temperature, and the valve element is kept within the preset temperature range; the valve element is controlled to rotate based on the preset speed; and a magnetic field is applied to the valve element based on the preset magnetic field intensity within the preset time range. The temperature field and the physical field jointly act on the valve element, microstructure adjustment of valve element parts is achieved, the fretting fatigue performance is improved on the premise that the precision of the valve element is kept, and industrial batch production and application can be conducted.

Description

Technical Field

[0001] The present disclosure relates to the technical field of metal material strengthening, and in particular to a strengthening method and a strengthening treatment device for a valve core. Background Art

[0002] Fretting fatigue refers to the phenomenon that under the action of cyclic load, a part of the surface of a component slides relatively with other contact surfaces with small amplitude, resulting in reduced fatigue strength or early fracture of the component. Fretting fatigue of hydraulic valve cores couples wear forms such as adhesive wear, abrasive wear and corrosion, and is one of the important failure forms of high-end pump and valve products.

[0003] The valve core is a key component of the hydraulic valve. The flow, circulation, closing and pressure can be controlled by the movement of the valve core. When the valve core is working, in addition to the reciprocating motion in the axial direction, there is also tangential movement. With the improvement of the processing accuracy and assembly accuracy of the valve core, the valve core and the outer wall will wear due to the small relative tangential vibration between the contact surface, inducing micro-motion fatigue fracture. The micro-motion fatigue of the valve core couples the wear forms such as adhesive wear, abrasive wear and corrosion, and is one of the important failure forms of high-end valve products. The factors affecting micro-motion fatigue are mainly: material microstructure factors, surface stress level, and environmental factors. At present, the methods used to improve micro-motion fatigue performance are mainly focused on improving the surface structure, mainly including: increasing surface texture, laser shock strengthening and other methods. The above methods are limited by the geometric structure and dimensional accuracy of valve core parts, and are difficult to apply. Summary of the invention

[0004] The present disclosure aims to at least solve the technical problem in the prior art that methods such as increasing surface texture and laser shock strengthening are limited by the geometric structure and dimensional accuracy of valve core parts and are difficult to apply.

[0005] To this end, an object of the present disclosure is to provide a method for strengthening a valve core, comprising:

[0006] Heating the valve core to a target temperature and maintaining the valve core within a preset temperature range;

[0007] Controlling the valve core to rotate based on a predetermined speed;

[0008] A magnetic field is applied to the valve core within a predetermined time range based on a preset magnetic field strength.

[0009] In some embodiments, the target temperature does not exceed a tempering temperature of the valve core.

[0010] In some embodiments, the preset magnetic field strength is between 1000mT-3000mT.

[0011] In some embodiments, the preset magnetic field strength does not exceed 1000 mT.

[0012] In some embodiments, the preset magnetic field strength does not exceed 300 mT.

[0013] One purpose of the present disclosure is to provide a strengthening treatment device for a valve core, which is applied to the above-mentioned strengthening method. The device includes a closable shell, in which a magnetic field generating device and a heating device are arranged. The magnetic field generating device defines an accommodating space, and the valve core is arranged in the accommodating space. The heating device is used to heat the valve core.

[0014] In some embodiments, a positioning device is further included, and the valve core is arranged in the accommodating space through the positioning device.

[0015] In some embodiments, the positioning device includes a stage and a driving assembly, the valve core is disposed on the stage, and the driving assembly is connected to the stage to drive the stage to rotate.

[0016] In some embodiments, the magnetic field generating device includes a plurality of magnets, and the plurality of magnets surround and form the accommodating space.

[0017] In some embodiments, the magnetic field generating device includes a first magnet, a second magnet, and a third magnet, and the first magnet, the second magnet, and the third magnet are sequentially connected to form a U-shaped structure.

[0018] In some embodiments, the heating device is disposed outside the magnetic field generating device and surrounds the accommodating space.

[0019] In some embodiments, a temperature measuring device is also included, and the temperature measuring device is used to measure the surface or internal temperature of the valve core.

[0020] In some embodiments, the valve core is a stainless steel valve core, a ceramic valve core, a high silicon cast iron valve core, a ceramic valve core, an austenitic heat-resistant steel valve core, an alloy steel valve core or a stainless acid-resistant steel valve core.

[0021] The embodiment of the present disclosure provides a strengthening method and strengthening treatment device for a valve core, which has the following beneficial effects:

[0022] The disclosed embodiment heats the valve core to a target temperature based on the effect of temperature on the valve core, and applies a magnetic field to the valve core based on the effect of magnetic field strength on the valve core. The temperature field and the physical field act together on the valve core to achieve microstructure adjustment of valve core parts, thereby improving micro-motion fatigue performance while maintaining valve core accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present disclosure 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 only some embodiments recorded in the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 is a flow chart of a method for strengthening a valve core in an embodiment of the present disclosure;

[0025] Figure 2 It is a schematic structural diagram of a valve core strengthening treatment device in an embodiment of the present disclosure.

[0026] Reference numerals:

[0027] 1. Shell; 2. Magnetic field generating device; 21. First magnet; 22. Second magnet; 23. Third magnet; 3. Heating device; 31. First heating element; 32. Second heating element; 33. Third heating element; 4. Accommodating space; 5. Positioning device; 51. Stage; 52. Driving assembly; 6. Valve core. DETAILED DESCRIPTION

[0028] Various aspects and features of the present disclosure are described herein with reference to the drawings.

[0029] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0030] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0031] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the attached drawings.

[0032] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0033] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0034] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments claimed are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of ways with substantially any suitable detailed structure.

[0035] Fretting fatigue refers to the phenomenon that under the action of cyclic load, a part of the surface of a component slides relatively with other contact surfaces with small amplitude, resulting in reduced fatigue strength or early fracture of the component. Fretting fatigue of hydraulic cylinder valve cores couples wear forms such as adhesive wear, abrasive wear and corrosion, and is one of the important failure forms of high-end pump and valve products.

[0036] The first embodiment of the present disclosure provides a strengthening treatment device for a valve core, such as Figure 2 As shown, the strengthening treatment device includes a closable shell 1, in which a magnetic field generating device 2 and a heating device 3 are arranged. The magnetic field generating device 2 defines an accommodating space 4, and the valve core 6 is arranged in the accommodating space 4. The heating device 3 is used to heat the valve core 6.

[0037] Specifically, the valve core 6 is disposed in the housing 1 and is strengthened in the housing 1 , and the strengthening here at least includes heating the valve core 6 and applying a magnetic field to the valve core 6 .

[0038] The strengthening method here is based on the following considerations: On the one hand, as the temperature rises, the average kinetic energy inside the metal material used to make the valve core increases, the resistance to atomic migration decreases, and the high-density dislocation area inside the material, especially the energy state of the grain boundary, is high, which is conducive to the diffusion of atoms concentrated at the grain boundary into the crystal. However, when the temperature drops to a very low level or rises to a very high level, the concentration and diffusion of atoms at the grain boundary are reversible, and the opposite process to the above process will occur, making it impossible to retain the state of atoms concentrated at the grain boundary diffusing into the crystal at room temperature; on the other hand, under the action of an external magnetic field, the magnetic field will cause the rotation state of electron pairs between atoms to change, causing irreversible changes in electron pairs. When in a certain temperature range, the material is close to the thermal activation threshold, and the external magnetic field can effectively promote the "re-dissolution" of solute atoms concentrated at the grain boundary, causing irreversible dislocation or stacking fault migration, thereby improving the stability of the microstructure and improving the material's anti-fretting wear performance.

[0039] In this embodiment, the shell 1 has thermal insulation performance, and the strengthening process of the valve core 6 is implemented in the shell 1. In the process of heating the valve core 6 by the heating device 3, the closable shell 1 can play a role of thermal insulation, thereby avoiding the time required to heat the valve core 6 being too long, which affects the strengthening efficiency.

[0040] The heat generated by the heating device 3 arranged in the shell 1 acts on the valve core 6, the accommodating space 4 defined by the magnetic field generating device 2 generates a magnetic field, the valve core 6 is arranged in the accommodating space 4, and the magnetic field generated by the magnetic field generating device 2 is also applied to the valve core 6, so that the valve core 6 is in the thermal field (temperature field) and the physical field (electromagnetic field) at the same time. Under the joint action of the temperature field and the electromagnetic field, the microstructure of the internal material of the valve core 6 is changed, and the micro-fatigue performance of the valve core 6 is improved while maintaining the accuracy of the valve core 6.

[0041] The strengthening treatment device of this embodiment further includes a positioning device 5, and the valve core 6 is arranged in the accommodating space 4 through the positioning device 5. The positioning device 5 is used to determine the position of the valve core 6 in the accommodating space 4 to prevent the valve core 6 from being separated from the accommodating space 4 and affecting the effects of the temperature field and the electromagnetic field on the valve core 6.

[0042] Specifically, the positioning device 5 includes a stage 51 and a driving assembly 52 . The valve core 6 is disposed on the stage 51 . The driving assembly 52 is connected to the stage 51 to drive the stage 51 to rotate.

[0043] The valve core 6 on the stage 51 is driven by the driving assembly 52 to continuously rotate in the accommodating space 4, so that the electromagnetic field generated by the magnetic field generating device 2 can act on various positions on the valve core 6. As the valve core 6 continues to rotate, the electromagnetic field acts on the valve core 6 more comprehensively and evenly. Similarly, based on the rotation of the valve core 6, the heating effect of the valve core 6 by the heating device 3 is also more uniform.

[0044] In addition, the positioning device 5 also includes a clamp. Specifically, the valve core 6 is connected to the stage 51 through the clamp. The stage 51 is provided with a positioning groove that cooperates with the clamp. When installing, the valve core 6 can be first installed on the clamp and then the whole can be matched with the positioning groove. According to the different shapes of the valve core 6, clamps of different specifications can be used accordingly, which is convenient for installing valve cores 6 of various shapes on the stage 51. In this embodiment, the range of the valve core 6 suitable for strengthening can be increased by using a clamp. Preferably, the clamp is a non-magnetic clamp, so as to avoid the magnetic field acting on the valve core 6 from also acting on the clamp, thereby causing unnecessary effects on non-strengthened products.

[0045] When multiple valve cores 6 can be placed in the accommodating space 4, for example, multiple valve cores 6 can be placed on the loading platform 51; further, in order to avoid obstruction when applying a magnetic field, multiple valve cores 6 can be arranged in sequence along the height direction in the accommodating space 4, thereby completing the performance improvement processing of multiple valve cores 6 at one time, thereby improving work efficiency.

[0046] Preferably, the plurality of valve cores 6 may be staggered in the height direction in the accommodating space 4 to avoid mutual shielding between different valve cores 6 , which would affect the magnetic field strength applied to some of the valve cores 6 .

[0047] Exemplarily, the driving assembly 52 includes a driving motor, and the output end of the driving motor is connected to one side of the stage 51 to drive the stage 51 to rotate. The speed of the driving motor is adjustable, which is conducive to adjusting the effect of the magnetic field strength acting on the valve core 6.

[0048] The heating device 3 in this embodiment is a resistance wire, and the heating device 3 is arranged outside the magnetic field generating device 2 and surrounds the accommodating space 4. By arranging the heating device 3 outside the magnetic field generating device 2, the heating device 3 will not affect the magnetic field generating device 2 applying a magnetic field to the valve core 6. The heating device 3 here can be fixed in the housing 1 in various ways, for example, the heating device 3 can be fixed in the housing 1 only by a fastening device.

[0049] In another embodiment, the heating device 3 can also be arranged on the inner side of the magnetic field generating device 2, that is, arranged in the accommodating space 4, which makes the distance between the heating device 3 and the valve core 6 closer, and can achieve rapid heating of the valve core 6 in a short time.

[0050] Here, when the heating device 3 is arranged on the inner side of the magnetic field generating mechanism, the heating device 3 extends into the accommodating space 4 through the telescopic mechanism to heat the valve core 6. The telescopic mechanism here is installed inside the shell 1. After the heating device 3 heats the valve core 6 to the target temperature, the heating device 3 is moved out of the accommodating space 4 through the telescopic mechanism to avoid the heating device 3 being placed in the accommodating space 4 to block the valve core 6, thereby affecting the magnetic field generating device 2 to apply a magnetic field to the valve core 6.

[0051] Specifically, the heating device 3 can be configured as a heating element, and the heating element is configured near the valve core 6, for example, above the valve core 6, to heat the valve core 6, thereby heating the valve core 6 to a target temperature. Of course, the heating device 3 can also be configured in plurality, and the plurality of heating devices 3 are distributed in an annular shape in the housing 1 to surround the valve core 6. Such a distribution can facilitate the heating device 3 to heat the valve core 6 from various angles, thereby avoiding uneven temperature distribution at various positions of the valve core 6.

[0052] For example, Figure 2 As shown, the heating device 3 includes a first heating element 31, a second heating element 32 and a third heating element 33. The first heating element 31 and the third heating element 33 are respectively arranged on both sides of the magnetic field generating device 2, and the second heating element 32 is arranged above the stage 51. The first heating element 31, the second heating element 32 and the third heating element 33 heat the valve core 6 from multiple directions respectively, so as to improve the temperature uniformity in the treatment process.

[0053] Here, the valve core 6 is generally heated to a target temperature, and the target temperature here does not exceed the tempering temperature of the valve core 6, so that the micro-motion fatigue capacity can be improved. If the tempering temperature is exceeded or the temperature is reduced to room temperature, the process treatment effect will be significantly reduced. In order to realize the temperature detection of the valve core 6, the strengthening treatment device also includes a temperature measuring device, which is used to measure the surface or internal temperature of the valve core 6. The temperature measuring device is arranged in the housing 1, and monitors the temperature of the valve core 6 in real time, which plays a role in safety monitoring. Preferably, the temperature measuring device is an infrared thermometer, and non-contact temperature measurement can be achieved by the infrared thermometer.

[0054] Furthermore, the magnetic field generating device 2 includes a plurality of magnets, and the plurality of magnets surround the accommodating space 4. A magnetic field is generated between the plurality of magnets. During the rotation of the valve core 6 along with the stage 51, the magnetic field continuously acts on different positions of the valve core 6. The magnetic field generating device 2 provides a magnetic field having a predetermined magnetic field strength. Applying a magnetic field with a predetermined magnetic field strength to the valve core 6 is beneficial to improving micro-motion fatigue performance.

[0055] In a specific embodiment, the magnetic field generating device 2 includes a first magnet 21, a second magnet 22 and a third magnet 23, wherein the first magnet 21, the second magnet 22 and the third magnet 23 are sequentially connected to form a U-shaped structure. The first magnet 21 and the second magnet 22 are permanent magnets, and the third magnet 23 is a magnetic conductor. For example, the first magnet 21 and the second magnet 22 are arranged relative to each other and generate a magnetic field therebetween to form a horizontal magnetic field loop. When the valve core 6 is installed, the axis of the valve core 6 is perpendicular to the direction of the magnetic field loop, which is conducive to ensuring that the magnetic field strength applied to the valve core 6 is more uniform.

[0056] The first magnet 21, the second magnet 22, and the third magnet 23 are sequentially connected to form a U-shaped structure to avoid permanent magnet attenuation and improve the stability of the magnetic field during the treatment process. In addition, the first magnet 21, the second magnet 22, and the third magnet 23 are sequentially connected to form a U-shaped structure instead of a closed rectangular structure, so that the magnetic field generating device 2 is provided with an opening, which is conducive to the heating device 3 heating the valve core 6 from the open structure, thereby improving the heating efficiency.

[0057] Exemplarily, the first magnet 21 and the second magnet 22 are respectively arranged on the left and right sides of the third magnet 23. At the same time, the loading platform 51 is arranged between the first magnet 21 and the second magnet 22, that is, the loading platform 51 is arranged in the accommodating space 4, and the valve core 6 is confined between the first magnet 21 and the second magnet 22, thereby achieving all-round strengthening of the valve core 6.

[0058] The valve core is a stainless steel valve core, a ceramic valve core, a high silicon cast iron valve core, a ceramic valve core, an austenitic heat-resistant steel valve core, an alloy steel valve core or a stainless acid-resistant steel valve core.

[0059] The strengthening treatment device also includes a controller, which is electrically connected to the drive assembly 52 and the temperature measuring device. In addition, the controller can also control the on and off of the magnetic field. When the temperature measuring device measures that the temperature of the valve core 6 reaches the target temperature, it feeds back to the controller, and the controller issues an instruction to start the drive assembly 52, so that the stage 51 and the valve core 6 rotate. The controller can control the start or stop of the drive assembly 52 and the temperature measuring device, which is conducive to realizing the automation of the process.

[0060] The present invention realizes the microstructure adjustment of valve core parts by the combined action of temperature field and physical field on the valve core, improves the micro-motion fatigue performance while maintaining the accuracy of the valve core, and can be applied in industrial mass production.

[0061] Based on the same inventive concept, the second embodiment of the present disclosure provides a strengthening method for a valve core, which is applied to a strengthening treatment device for a valve core in any of the above-mentioned embodiments. The strengthening method adjusts the microstructure of the valve core material through the combined action of thermal field (temperature field) and physical field (electromagnetic field), that is, adjusts the lattice dislocation structure inside the metal to improve the micro-fatigue performance.

[0062] like Figure 1 As shown, the strengthening method includes:

[0063] S1: heating the valve core 6 to a target temperature and maintaining the valve core 6 within a preset temperature range.

[0064] Because below the tempering temperature, as the temperature increases, the average kinetic energy inside the metal material increases, the resistance to atomic migration decreases, and the high-density dislocation areas inside the material, especially the energy state of the grain boundaries, are relatively high, which is conducive to the atoms segregated at the grain boundaries diffusing into the crystal. However, when the temperature drops to a very low level or rises to a very high level, the segregation and diffusion of atoms at the grain boundaries are reversible, and a process opposite to the above process will occur. The state in which the atoms segregated at the grain boundaries diffuse into the crystal cannot be retained at room temperature. Therefore, the target temperature does not exceed the tempering temperature of the valve core 6. After the valve core 6 is heated to the target temperature, the valve core 6 needs to be maintained within a preset temperature range. Among them, the valve core 6 of different materials and the hardness of the valve core 6 are different, and their tempering temperatures are different, so the corresponding target temperatures are also different.

[0065] Specifically, heating the valve core 6 to the target temperature is achieved by the heating device 3 in the shell 1. The heating device 3 acts on the valve core 6 and heats the valve core 6. The temperature of the valve core 6 can be monitored by the temperature measuring device. When the temperature measuring device detects that the current temperature reaches the target temperature, the heating device 3 is controlled to stop heating or reduce the heating power.

[0066] Meanwhile, during the strengthening process of the valve core 6, the temperature measuring device will monitor the temperature of the valve core 6 in real time, and keep the temperature of the valve core 6 within the preset temperature range by controlling the heating power of the heating device 3. For example, if the temperature of the valve core 6 is lower than the preset temperature range, the heating device 3 will heat it again; if the temperature of the valve core 6 is higher than the preset temperature range, the heating device 3 will be controlled to stop heating or cool it by other cooling devices.

[0067] S2: Control the valve core 6 to rotate based on a predetermined speed.

[0068] Specifically, the valve core 6 rotates under the control of the driving component 52, and the speed of the driving component 52 can be adjusted, thereby adjusting and changing the speed of the valve core 6 to a predetermined speed, and the valve core 6 rotates at a predetermined speed so that the magnetic field generated by the magnetic field generating device 2 acts more evenly on the valve core 6. Exemplarily, the driving component 52 includes a driving motor, and the driving motor drives the stage 51 to rotate, and the valve core 6 is controlled to rotate based on the predetermined speed by controlling the speed of the driving motor.

[0069] S3: applying a magnetic field to the valve core 6 based on a preset magnetic field strength within a predetermined time range.

[0070] Under the action of an external magnetic field, the magnetic field will cause the rotation state of electron pairs between atoms to change, triggering irreversible changes in electron pairs. When in a certain temperature range, the material is close to the thermal activation threshold, and the external magnetic field can effectively promote the "re-dissolution" of solute atoms segregated at the grain boundaries, causing irreversible dislocation or stacking fault migration, thereby improving the stability of the mesostructure and thus improving the material's anti-fretting wear performance. The magnitude of the applied magnetic field strength will affect the strengthening process effect of the valve core 6. If the magnetic field strength is too high, the effect of improving the microstructure will be poor.

[0071] Specifically, the application of the magnetic field to the valve core 6 is achieved by the magnetic field generating device 2. The multiple magnets of the magnetic field generating device 2 surround the accommodating space 4, and a magnetic field is generated between the multiple magnets. The valve core 6 is arranged in the accommodating space 4. During the rotation of the valve core 6, the magnetic field with the preset magnetic field strength continuously acts on different positions of the valve core 6.

[0072] In a specific embodiment, the preset magnetic field strength is between 1000mT-3000mT.

[0073] In another specific embodiment, the preset magnetic field strength does not exceed 1000 mT.

[0074] In another specific embodiment, the preset magnetic field strength does not exceed 300 mT.

[0075] The predetermined time here refers to the time used for applying the magnetic field to the valve core 6 after the valve core 6 has been heated to the target temperature. The predetermined time range here will affect the effect of applying the magnetic field.

[0076] In addition, considering the strengthening method of simply heating first and then applying a magnetic field, applying a magnetic field to the valve core 6 with a lower temperature often requires a higher magnetic field strength. The embodiment of the present disclosure further applies a magnetic field to the valve core 6 with a higher temperature after heating, thereby achieving simultaneous coupling of the thermal field and the physical field, which can effectively reduce the magnetic field strength. The thermal field has a high energy conversion efficiency, is easy to repair and maintain, and has a uniform processing effect, which is suitable for batch processing applications of valve core products.

[0077] The valve core of the embodiment of the present disclosure is a stainless steel valve core, a ceramic valve core, a high-silicon cast iron valve core, a ceramic valve core, an austenitic heat-resistant steel valve core, an alloy steel valve core or a stainless acid-resistant steel valve core.

[0078] Compared with the conventional methods of increasing surface texture and laser shock strengthening, the strengthening method of the disclosed embodiment only requires the provision of the heating device 3 and the magnetic field generating device 2, and is suitable for batch processing applications of valve core products.

[0079] In the description of the present disclosure, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0080] In the description of the present disclosure, "first feature" or "second feature" may include one or more of the features.

[0081] In the description of the present disclosure, “plurality” means two or more.

[0082] In the description of the present disclosure, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0083] In the description of the present disclosure, “above”, “over” and “on top” a first feature of a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0084] In the description of the present disclosure, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0085] Although the embodiments of the present disclosure have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and purpose of the present disclosure, and that the scope of the present disclosure is defined by the claims and their equivalents. Although the embodiments of the present disclosure have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and purpose of the present disclosure, and that the scope of the present disclosure is defined by the claims and their equivalents.

Claims

1. A method for strengthening a valve core, characterized in that: include: Heating the valve core to a target temperature and maintaining the valve core within a preset temperature range; Controlling the valve core to rotate based on a predetermined speed; A magnetic field is applied to the valve core within a predetermined time range based on a preset magnetic field strength.

2. The valve core strengthening method according to claim 1, characterized in that: The target temperature does not exceed the tempering temperature of the valve core.

3. The valve core strengthening method according to claim 1, characterized in that: The preset magnetic field strength is between 1000mT and 3000mT.

4. The valve core strengthening method according to claim 1, characterized in that: The preset magnetic field strength does not exceed 1000mT.

5. The valve core strengthening method according to claim 1, characterized in that: The preset magnetic field strength does not exceed 300mT.

6. A strengthening treatment device for a valve core, characterized in that: Applied to the strengthening method described in any one of claims 1 to 5, the device includes a closable shell, a magnetic field generating device and a heating device are arranged in the shell, the magnetic field generating device defines an accommodating space, the valve core is arranged in the accommodating space, and the heating device is used to heat the valve core.

7. The valve core strengthening treatment device according to claim 6, characterized in that: It also includes a positioning device, and the valve core is arranged in the accommodating space through the positioning device.

8. The valve core strengthening treatment device according to claim 7, characterized in that: The positioning device comprises a stage and a driving assembly, the valve core is arranged on the stage, and the driving assembly is connected to the stage to drive the stage to rotate.

9. The valve core strengthening treatment device according to claim 6, characterized in that: The magnetic field generating device includes a plurality of magnets, and the plurality of magnets surround and form the accommodating space.

10. The valve core strengthening treatment device according to claim 9, characterized in that: The magnetic field generating device comprises a first magnet, a second magnet and a third magnet, and the first magnet, the second magnet and the third magnet are sequentially connected to form a U-shaped structure.

11. The valve core strengthening treatment device according to claim 6, characterized in that: The heating device is arranged outside the magnetic field generating device and surrounds the accommodating space.

12. The valve core strengthening treatment device according to claim 6, characterized in that: It also includes a temperature measuring device, which is used to measure the surface or internal temperature of the valve core.

13. The valve core strengthening treatment device according to claim 6, characterized in that: The valve core is a stainless steel valve core, a ceramic valve core, a high silicon cast iron valve core, a ceramic valve core, an austenitic heat-resistant steel valve core, an alloy steel valve core or a stainless acid-resistant steel valve core.

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