Vacuum annealing process method for 1J22 soft magnetic material thin-wall part

Abstract

The invention relates to the field of heat treatment processing, in particular to a 1J22 soft magnetic material thin-wall part vacuum annealing process method which comprises the following steps: (1) manufacturing a 1J22 soft magnetic material sample, and cleaning a part and the sample; (2) charging the part and the sample into a furnace; (3) performing primary annealing on the part and the sample; (4) performing magnetic detection on the sample subjected to primary annealing, if a magnetic detection result meets requirements, executing the step (5), otherwise, adjusting parameters of primary annealing, and repeating the steps (1)-(3); (5) the part and the sample are subjected to finish machining; (6) carrying out secondary annealing on the part and the sample subjected to finish machining; and (7) carrying out magnetic detection on the sample subjected to secondary annealing, if a magnetic detection result meets the requirement, ending the annealing process, otherwise, adjusting parameters of secondary annealing, and repeating the step (6).

Description

Technical Field

[0001] The invention relates to the field of heat treatment processing, and in particular to a vacuum annealing process method for thin-walled parts made of 1J22 soft magnetic materials. Background Art

[0002] 1J22 soft magnetic alloy is an iron-cobalt-vanadium soft magnetic material with high saturation magnetic induction intensity. It has high magnetic induction intensity and is very suitable for processing magnetic parts working in strong magnetic fields. In the aviation field, 1J22 is a very important metal material. In addition, since the Curie temperature of this alloy is as high as 980℃, it can continue to work in a high temperature environment where general soft magnetic alloys cannot work normally, and can maintain relatively good magnetic properties. Therefore, this material is widely used in the aerospace field as the armature punching of aerospace synchronous and torque motors.

[0003] 1J22 soft magnetic alloy is very sensitive to stress. The residual stress generated by machining will reduce the magnetic properties of the parts. In order to obtain the magnetic properties of the material, the parts need to be heat treated to fully eliminate the internal stress, purify the structure, and make the grains grow evenly, thereby improving the magnetic properties and meeting the use requirements. However, the machining performance of 1J22 material is poor, and machining stress is easily generated during the machining process, especially for thin-walled parts such as solenoid valves and armatures with small dimensional tolerances. Magnetic annealing process is generally used. Magnetic annealing requires a high temperature of 1100℃, which can easily cause deformation of parts and lead to dimensional deviation. Therefore, a new annealing method is needed to ensure that the parts will not deform during the annealing process. Summary of the invention

[0004] The purpose of the present invention is to provide a vacuum annealing process method for thin-walled parts made of 1J22 soft magnetic materials, which adopts a process method of rough machining + first magnetic annealing + fine machining + second recovery magnetic annealing, which can ensure that the magnetic properties of the parts are qualified after heat treatment annealing and reduce part deformation.

[0005] Technical solution:

[0006] A vacuum annealing process for thin-walled parts of 1J22 soft magnetic material, comprising the following steps:

[0007] Step (1) preparing 1J22 soft magnetic material samples, and cleaning 1J22 soft magnetic material thin-walled parts and samples;

[0008] Step (2) loading the cleaned 1J22 soft magnetic material thin-walled parts and samples into a furnace;

[0009] Step (3) annealing the 1J22 soft magnetic material thin-walled parts and samples;

[0010] Step (4) performing magnetic detection on the 1J22 soft magnetic material sample after the primary annealing. If the magnetic detection result meets the requirements, executing step (5); otherwise, adjusting the parameters of the primary annealing and repeating steps (1) to (3);

[0011] Step (5) fine-machining the 1J22 soft magnetic material thin-walled parts and samples;

[0012] Step (6) performing secondary annealing on the finely machined 1J22 soft magnetic material thin-walled parts and samples;

[0013] Step (7) performs magnetic testing on the 1J22 soft magnetic material sample after secondary annealing. If the magnetic testing result meets the requirements, the annealing process is terminated. Otherwise, the parameters of the secondary annealing are adjusted and step (6) is repeated.

[0014] Further, in step (1), the 1J22 soft magnetic material parts are cleaned according to the following steps:

[0015] a: Ultrasonic degreasing at 50℃, 15min;

[0016] b: cold water wash, 2min;

[0017] c: hot water washing at 70℃, 3min;

[0018] d: drying at 80℃ for 15min

[0019] e: Hydrocarbon ultrasonic cleaning for 15 minutes

[0020] f: Dry at 80℃ for 15min.

[0021] Further, step (2) specifically includes the following steps:

[0022] a: Wear gloves to pick up 1J22 soft magnetic material thin-walled parts and samples;

[0023] b: Place the 1J22 soft magnetic material thin-walled parts and samples into the tray;

[0024] c: Load the 1J22 soft magnetic material thin-walled parts and samples in the tray into the vacuum furnace.

[0025] Furthermore, step (3) performs an annealing on the 1J22 soft magnetic material thin-walled parts and samples, including a first stage of heating, a second stage of cooling, a third stage of cooling and a fourth stage of cooling.

[0026] Furthermore, the first stage of primary annealing is heating: raising the temperature in the vacuum furnace to 1100±10°C and keeping it warm for 6-6.5h; the second stage is cooling: reducing the temperature in the vacuum furnace to 850±10°C at a rate of 50-80°C / h and keeping it warm for 3-3.5h; the third stage is cooling: reducing the temperature in the vacuum furnace to 700±10°C at a rate not higher than 50°C / h; the fourth stage is cooling: reducing the temperature in the vacuum furnace to below 200°C at a rate lower than 200°C / h.

[0027] Furthermore, step (4) is specifically: subjecting the sample after step (3) to magnetic testing according to GB / T15002-94 "Technical Conditions for Soft Magnetic Alloys with High Saturation Magnetic Induction Intensity", which should meet the following requirements: coercive force Hc≤144A / m, magnetic induction intensity B2400≥2.05T at a magnetic field intensity of 2400A / m, magnetic induction intensity B4000≥2.15T at a magnetic field intensity of 4000A / m, and magnetic induction intensity B8000≥2.2T at a magnetic field intensity of 8000A / m.

[0028] Furthermore, step (6) 1J22 soft magnetic material thin-walled parts and samples are subjected to secondary annealing, including a first stage of heating, a second stage of cooling, and a third stage of cooling.

[0029] Furthermore, the first stage of secondary annealing is heating: raising the temperature in the vacuum furnace to 850±10°C and keeping it warm for 3-3.5h; the second stage is cooling: reducing the temperature in the vacuum furnace to 700±10°C at a rate not higher than 50°C / h; the third stage is cooling: reducing the temperature in the vacuum furnace to below 200°C at a rate lower than 200°C / h.

[0030] Furthermore, step (7) is specifically: subjecting the part sample after step (6) to magnetic testing in accordance with GB / T15002-94 "Technical Conditions for Soft Magnetic Alloys with High Saturation Magnetic Induction Intensity", which should meet the following requirements: coercive force Hc≤144A / m, magnetic induction intensity B2400≥2.05T at a magnetic field intensity of 2400A / m, magnetic induction intensity B4000≥2.15T at a magnetic field intensity of 4000A / m, and magnetic induction intensity B8000≥2.2T at a magnetic field intensity of 8000A / m.

[0031] Beneficial effects:

[0032] A vacuum annealing process method for thin-walled parts of 1J22 soft magnetic materials is provided, which adopts a process method of rough machining + first magnetic annealing + fine machining + second magnetic recovery annealing. By reasonably selecting the process method and process parameters, the deformation of the parts can be minimized under the premise of ensuring the magnetic properties of the product. After the annealing heat treatment of the 1J22 soft magnetic material of the present invention, all performance indicators of the parts meet the product design requirements, and the first inspection pass rate reaches more than 95%.

[0033] The invention effectively solves the technical difficulties of vacuum annealing of thin-walled parts made of 1J22 soft magnetic materials, meets the technical requirements of design drawings, and ensures smooth delivery of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. It is obvious that the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 It is a cross-sectional view of the parts of the present invention;

[0036] Figure 2 It is the parts outline drawing of the present invention;

[0037] Figure 3 This is a heat treatment cleaning flow chart of step (1) of the present invention;

[0038] Figure 4 This is a process curve diagram of the primary annealing of the J22 alloy in step 1 of the present invention;

[0039] Figure 5 This is the process curve diagram of the secondary annealing of the J22 alloy in step 1 of the present invention;

[0040] Figure 6 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0043] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] The present invention provides a vacuum annealing process for thin-walled parts of 1J22 soft magnetic materials, comprising the following steps:

[0045] Step (1) preparing 1J22 soft magnetic material samples, and cleaning 1J22 soft magnetic material thin-walled parts and samples;

[0046] 1J22 soft magnetic material parts are cleaned according to the following steps:

[0047] a: Ultrasonic degreasing at 50℃, 15min;

[0048] b: cold water wash, 2min;

[0049] c: hot water washing at 70℃, 3min;

[0050] d: drying at 80℃ for 15min

[0051] e: Hydrocarbon ultrasonic cleaning for 15 minutes

[0052] f: Dry at 80℃ for 15min.

[0053] Step (2) loading the cleaned 1J22 soft magnetic material thin-walled parts and samples into a furnace;

[0054] The following steps are involved:

[0055] a: Wear gloves to pick up 1J22 soft magnetic material thin-walled parts and samples;

[0056] b: Place the 1J22 soft magnetic material thin-walled parts and samples into the tray;

[0057] c: Load the 1J22 soft magnetic material thin-walled parts and samples in the tray into the vacuum furnace.

[0058] Step (3) annealing the 1J22 soft magnetic material thin-walled parts and samples; including a first stage of heating, a second stage of cooling, a third stage of cooling and a fourth stage of cooling.

[0059] Furthermore, the first stage of primary annealing is heating: raising the temperature in the vacuum furnace to 1100±10°C and keeping it warm for 6-6.5h; the second stage is cooling: reducing the temperature in the vacuum furnace to 850±10°C at a rate of 50-80°C / h and keeping it warm for 3-3.5h; the third stage is cooling: reducing the temperature in the vacuum furnace to 700±10°C at a rate not higher than 50°C / h; the fourth stage is cooling: reducing the temperature in the vacuum furnace to below 200°C at a rate lower than 200°C / h.

[0060] Step (4) performs magnetic detection on the 1J22 soft magnetic material sample after the primary annealing, specifically, the sample after step (3) is subjected to magnetic detection according to GB / T15002-94 "Technical Conditions for Soft Magnetic Alloys with High Saturation Magnetic Induction Intensity", which should meet the following requirements: coercive force Hc≤144A / m, magnetic induction intensity B2400≥2.05T at a magnetic field intensity of 2400A / m, magnetic induction intensity B4000≥2.15T at a magnetic field intensity of 4000A / m, and magnetic induction intensity B8000≥2.2T at a magnetic field intensity of 8000A / m. If the magnetic detection result meets the requirements, perform step (5), otherwise adjust the parameters of the primary annealing and repeat steps (1) to (3);

[0061] Step (5) fine-machining the 1J22 soft magnetic material thin-walled parts and samples;

[0062] Step (6) performs secondary annealing on the finely machined 1J22 soft magnetic material thin-walled parts and samples; including a first stage of heating, a second stage of cooling, and a third stage of cooling.

[0063] Furthermore, the first stage of secondary annealing is heating: raising the temperature in the vacuum furnace to 850±10°C and keeping it warm for 3-3.5h; the second stage is cooling: reducing the temperature in the vacuum furnace to 700±10°C at a rate not higher than 50°C / h; the third stage is cooling: reducing the temperature in the vacuum furnace to below 200°C at a rate lower than 200°C / h.

[0064] Step (7) performs magnetic testing on the 1J22 soft magnetic material sample after secondary annealing. If the magnetic testing result meets the requirements, the annealing process is terminated. Otherwise, the parameters of the secondary annealing are adjusted and step (6) is repeated.

[0065] Specifically, the part sample after step (6) is subjected to magnetic testing according to GB / T15002-94 "Technical Conditions for Soft Magnetic Alloys with High Saturation Magnetic Induction Intensity", and should meet the following requirements: coercive force Hc≤144A / m, magnetic induction intensity B2400≥2.05T at a magnetic field intensity of 2400A / m, magnetic induction intensity B4000≥2.15T at a magnetic field intensity of 4000A / m, and magnetic induction intensity B8000≥2.2T at a magnetic field intensity of 8000A / m.

[0066] The annealing process adopted by the present invention can diffuse the alloy elements of the 1J22 material, homogenize the structure, eliminate the internal stress of the alloy, and make the grains of the alloy grow fully to improve the magnetic properties through high-temperature heating; the annealing process adopts high vacuum, which can remove volatile impurities and prevent the surface oxidation of parts;

[0067] Among them, the primary annealing temperature is selected as 1100℃, which can not only meet the preferred purification annealing temperature range of 1080-1120℃ for HB / Z192 soft magnetic alloy 1J22, but also be higher than the Curie temperature of the material, and can also ensure the magnetic properties of the parts after annealing; if the annealing temperature range is not within the range of 1080-1120℃, the magnetic properties of 1J22 will decrease, and the 1J22 parts will produce stress and cause deformation. Therefore, the soft magnetic alloy 1J22 can only be annealed once within the range of 1080-1120℃.

[0068] The secondary annealing temperature is 850℃, which can not only meet the temperature range of 850-900℃ for the final annealing of HB / Z192 soft magnetic alloy 1J22, but also ensure the magnetic properties of the parts after secondary annealing; if the annealing temperature range is not within the range of 850-900℃, the magnetic properties of 1J22 will not be restored, and the 1J22 parts will produce stress and cause deformation. Therefore, the soft magnetic alloy 1J22 can only be annealed twice within the range of 850-900℃. The parameters of the two annealings are shown in Table 1:

[0069] Table 1 Annealing parameters of 1J22 rod alloy

[0070]

[0071] The two-time annealing scheme is adopted: rough machining + first magnetic annealing + fine machining + second recovery magnetic annealing. This scheme is better than one-time annealing and can minimize the deformation of parts while ensuring the magnetic properties of the product.

[0072] The annealing process uses a material tray made of 45 steel material, which can ensure that the element content of the parts is qualified after heat treatment annealing, and the Cr element content on the surface of the parts will not increase.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A vacuum annealing process for thin-walled parts of 1J22 soft magnetic materials, characterized in that: The following steps are involved: Step (1) preparing 1J22 soft magnetic material samples, and cleaning 1J22 soft magnetic material thin-walled parts and samples; Step (2) loading the cleaned 1J22 soft magnetic material thin-walled parts and samples into a furnace; Step (3) annealing the 1J22 soft magnetic material thin-walled parts and samples; Step (4) performing magnetic detection on the 1J22 soft magnetic material sample after the primary annealing. If the magnetic detection result meets the requirements, executing step (5); otherwise, adjusting the parameters of the primary annealing and repeating steps (1) to (3); Step (5) fine-machining the 1J22 soft magnetic material thin-walled parts and samples; Step (6) performing secondary annealing on the finely machined 1J22 soft magnetic material thin-walled parts and samples; Step (7) performs magnetic testing on the 1J22 soft magnetic material sample after secondary annealing. If the magnetic testing result meets the requirements, the annealing process is terminated. Otherwise, the parameters of the secondary annealing are adjusted and step (6) is repeated.

2. A vacuum annealing process for 1J22 soft magnetic material thin-walled parts according to claim 1, characterized in that: In step (1), the 1J22 soft magnetic material parts are cleaned according to the following steps: a: Ultrasonic degreasing at 50℃, 15min; b: cold water wash, 2min; c: hot water washing at 70℃, 3min; d: drying at 80℃ for 15min e: Hydrocarbon ultrasonic cleaning for 15 minutes f: Dry at 80℃ for 15min.

3. A vacuum annealing process for 1J22 soft magnetic material thin-walled parts according to claim 2, characterized in that: Step (2) specifically includes the following steps: a: Wear gloves to pick up 1J22 soft magnetic material thin-walled parts and samples; b: Place the 1J22 soft magnetic material thin-walled parts and samples into the tray; c: Load the 1J22 soft magnetic material thin-walled parts and samples in the tray into the vacuum furnace.

4. A vacuum annealing process for 1J22 soft magnetic material thin-walled parts according to claim 3, characterized in that: Step (3) annealing the 1J22 soft magnetic material thin-walled parts and samples includes a first stage of heating, a second stage of cooling, a third stage of cooling and a fourth stage of cooling.

5. A vacuum annealing process for 1J22 soft magnetic material thin-walled parts according to claim 4, characterized in that: The first stage of primary annealing is heating: raising the temperature in the vacuum furnace to 1100±10℃ and keeping it warm for 6-6.5h; the second stage is cooling: reducing the temperature in the vacuum furnace to 850±10℃ at a rate of 50-80℃ / h and keeping it warm for 3-3.5h; the third stage is cooling: reducing the temperature in the vacuum furnace to 700±10℃ at a rate not higher than 50℃ / h; the fourth stage is cooling: reducing the temperature in the vacuum furnace to below 200℃ at a rate lower than 200℃ / h.

6. A vacuum annealing process for 1J22 soft magnetic material thin-walled parts according to claim 5, characterized in that: Step (4) is specifically: subjecting the sample after step (3) to magnetic testing according to GB / T15002-94 "Technical Conditions for Soft Magnetic Alloys with High Saturation Magnetic Induction Intensity", which should meet the following requirements: coercive force Hc≤144A / m, magnetic induction intensity B2400≥2.05T at a magnetic field intensity of 2400A / m, magnetic induction intensity B4000≥2.15T at a magnetic field intensity of 4000A / m, and magnetic induction intensity B8000≥2.2T at a magnetic field intensity of 8000A / m.

7. A vacuum annealing process for 1J22 soft magnetic material thin-walled parts according to claim 6, characterized in that: Step (6) 1J22 The soft magnetic material thin-walled parts and samples are subjected to secondary annealing, including a first stage of heating, a second stage of cooling, and a third stage of cooling.

8. A vacuum annealing process for 1J22 soft magnetic material thin-walled parts according to claim 7, characterized in that: The first stage of secondary annealing is heating: raising the temperature in the vacuum furnace to 850±10℃ and keeping it warm for 3-3.5h; the second stage is cooling: reducing the temperature in the vacuum furnace to 700±10℃ at a rate not higher than 50℃ / h; the third stage is cooling: reducing the temperature in the vacuum furnace to below 200℃ at a rate lower than 200℃ / h.

9. A vacuum annealing process for 1J22 soft magnetic material thin-walled parts according to claim 8, characterized in that: Step (7) is specifically: subjecting the part sample after step (6) to magnetic testing according to GB / T15002-94 "Technical Conditions for Soft Magnetic Alloys with High Saturation Magnetic Induction Intensity", which should meet the following requirements: coercive force Hc≤144A / m, magnetic induction intensity B2400≥2.05T at a magnetic field intensity of 2400A / m, magnetic induction intensity B4000≥2.15T at a magnetic field intensity of 4000A / m, and magnetic induction intensity B8000≥2.2T at a magnetic field intensity of 8000A / m.

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