RU2024623C1 - Method for thermomagnetic machining of toroidal cores made from amorphous magnetically-soft materials - Google Patents

Abstract

FIELD: metallurgy. SUBSTANCE: properties of cores are formed by generating magnetic field with permanent magnets and applying it to the core from the side of its bases so that it acts in the plane of the band alone. The magnetic fields can be applied from the following directions: opposite direction for prevailing orienting of domains in the longitudinal direction (along center line of core), by applying a certain number of like-named poles of permanent magnets to core bases; agreeing direction for prevailing orienting of domains in transverse direction - also by applying a certain number of different-named poles of permanent magnets to core bases; agreeing direction for prevailing orienting of domains in longitudinal direction - by applying different-named poles of permanent magnets to any one base of the core; agreeing or opposite direction set at an angle of 45 deg to center line of core for varying its properties. EFFECT: thermomagnetic treatment process is made continuous both in transverse and longitudinal magnetic fields; magnetic permeability can be adjusted by changing inclination angle of magnetic flux. 7 cl, 19 dwg

Description

 The invention relates to metallurgy, in particular to a method for heat treatment of soft materials.

 In metallurgy, methods for heat treatment of amorphous soft magnetic alloys are known [1, 2], which consists in heating them to a certain temperature not exceeding the crystallization temperature and cooling at a controlled speed. Method [1] consists in heating to a temperature lying in the range limited by the Curie point and crystallization temperature, holding at this temperature and cooling at a controlled speed.

 The disadvantage of this method is the lack of a magnetic field during the heat treatment of toroidal cores, allowing you to adjust their magnetic permeability.

 The method [2] also consists in heating and cooling toroidal cores with certain speeds with the application of a magnetic field on the heat-treatable cores, which is directed either along or across the length of the tape from which the toroidal core is wound.

 The disadvantages of the method is the lack of exposure needed to relax the stresses created when winding the toroidal cores, will lead to a decrease in their magnetic permeability; when using one of two mutually perpendicular magnetic fields superimposed on the toroidal core during heat treatment, it will allow one to obtain extreme values of magnetic permeability: the maximum when applying a magnetic field acting along the tape, and the minimum when applying a magnetic field transverse to the length of the tape.

 The closest technical solution is the method of thermomagnetic processing of cores from amorphous magnetically soft alloys [3], which consists in heating them to a temperature lying between the Curie point and the crystallization temperature, holding at this temperature and cooling at a controlled speed in a longitudinal magnetic field.

 This technical solution also has a significant drawback, namely, in heat treatment in a magnetic field, it is impossible to obtain a wide range of magnetic permeabilities of toroidal cores from amorphous soft magnetic alloys.

 The aim of the invention is the ability to control magnetic permeability in the core by changing the angle of inclination of the magnetic flux.

The goal is achieved by the fact that during heat treatment, the magnetic flux created by the permanent magnets applied to the base of the core penetrates the core at different angles to its midline, depending on one or another version of the permanent magnets to its bases. To regulate magnetic permeability in a wide range, the following options are proposed for applying permanent magnets to the bases of the toroidal core for the predominant orientation of the domains in them during the heat treatment:
in order to direct the magnetic flux along the length of the tape from which the core is wound, they make an application to one of its bases of opposite poles of magnets at their alternate location along the midline of the core (Fig. 4);
to direct the magnetic flux along the length of the tape from which the core is wound, a certain number of poles of the same name with permanent magnets are applied to the bases of the cores, the poles of the permanent magnets being oriented against each other (the number of permanent magnets adjacent to any base of the core can vary from three to eight, depending on the type rating of the core and the properties that it should have after heat treatment) (Fig. 1);
to direct the magnetic flux at an angle to the direction of the length of the tape from which the core is wound, produce a shift of 45 ° ^of permanent magnets adjacent to any base of the core relative to magnets of the same polarity adjacent to its other base (Fig. 2);
also to direct the magnetic flux at an angle to the direction of the length of the tape from which the core is wound, produce a shift of 45 ^about relatively permanent magnets of opposite polarity adjacent to its other base (Fig. 3);
for directing the magnetic flux along the length of the tape from which the core is wound, applying to the base of the core following each other along its midline opposite poles of permanent magnets, with the opposite poles of magnets should be located opposite each other (Fig. 5);
in order to direct the magnetic flux across the length of the tape, the next to each other along the midline of the opposite poles of the magnets are applied to the base of the core, the opposite poles of the magnets should be located opposite each other (Fig. 6).

 The choice of a particular arrangement of permanent magnets along the midline of the core during thermomagnetic processing allows you to change the degree of tilt of the magnetization reversal loop the magnitude of the magnetic permeability of its alloy (Fig. 7-18).

 The above options for the application of permanent magnets in thermomagnetic processing make it possible to orient domains in the amorphous soft magnetic alloy of the tape from which the core is wound, in the plane of the tape along its midline, across or at an angle to it, which allows one to obtain the necessary magnetic permeability of the toroidal core during thermomagnetic processing.

 In FIG. 1-6 give an idea of the options for permanent magnets to create a longitudinal (Fig. 1, 4 and 5), transverse (Fig. 6) and acting at an angle to the midline of the cores (Fig. 2 and 3) magnetic flux during heat treatment; in FIG. 7-9 - magnetization reversal loops of cores OL12 / 20-6 from alloy 7421 TU 14-1-3954-85, heat-treated according to the options for applying magnets, shown respectively in FIG. 1, 2 and 3; in FIG. 10-13 - core remanufacturing loops OL10 / 16-3 from the alloy AMAG-183 ЯеО.021.180. TU, heat-treated according to the options for applying magnets, presented respectively in FIG. 1, 2, 4 and 5; in FIG. 14-16 - magnetization reversal loops of OL12 / 20-5 cores from 9KSR alloy TU14-1-3954-85, heat-treated according to the options for applying magnets, shown respectively in FIG. 1, 4 and 5; in FIG. 17-19 - magnetization reversal loops of cores OL12 / 20-6 from alloy 7421, heat-treated according to the options for applying magnets, shown respectively in FIG. 4, 5 and 6, with FIG. 19 shows the magnetization reversal loops according to the embodiment of the magnets in FIG. 6 without preliminary exposure to an alternating magnetic field (curve 1 and with preliminary exposure to an alternating magnetic field that varies with a frequency of 50 Hz, curve 2).

 The proposed method of thermomagnetic processing is implemented on the cores of amorphous soft magnetic alloys: AMAG-183, 7421 and 9KSR.

The heat treatment, which consists in heating, holding to relieve stresses and cooling, was carried out when the core was pierced by one of the above magnetic fluxes: longitudinal, obtained by arranging permanent magnets according to FIG. 1, 4 and 5; transverse obtained by arrangement of permanent magnets according to FIG. 6, and directed at an angle to the midline of the core obtained by arranging the magnets of FIG. 2 and 3. The final heating temperature was determined by the Curie point, the crystallization temperature of the alloys, and the ability of amorphous magnetically soft alloys to relax stresses created when winding the core. Thus, the thermal treatment of alloys 7421 and AMAG-183 is: heated to 400 ^{° C} at an average rate ^of 5 C / min, holding at this temperature for 20 minutes and cooling at an average speed of 6 ° ^C / min. Heat treating the alloy 9KS mode different from the heat treatment of alloys 7421 and AMAG-183 in that the final temperature was increased to 450 ^{° C} and the holding time was reduced to 10 minutes.

 Using the proposed method of heat treatment will allow the process of thermomagnetic treatment to be made continuous during heat treatment not only in a transverse magnetic field, but also in a longitudinal one, which will automate the process of thermomagnetic processing of amorphous magnetically soft alloys.

Claims (7)

 1. METHOD FOR THERMOMAGNETIC PROCESSING OF TOROIDAL CORES FROM AMORPHIC MAGNETIC-SOFT ALLOYS, including heating to a temperature between the Curie point and the crystallization temperature, holding at this temperature and cooling in a magnetic field, characterized in that all operations are carried out with the application of a magnetic field created by applying permanent magnets to at least one core base along its midline.  2. The method according to claim 1, characterized in that the polarity of the permanent magnets applied to one of the bases of the core alternates.  3. The method according to claim 1, characterized in that the permanent magnets applied to the base of the core have the same polarity and are oriented against each other. 4. The method according to claim 1, characterized in that the permanent magnets applied to the base of the core have the same polarity and are positioned so that a shift between the magnets adjacent to the opposite bases is provided by an angle of 45 ^o . 5. The method according to claim 1, characterized in that the permanent magnets applied to the opposite bases of the core have the opposite polarity and are offset by an angle of 45 ^o .  6. The method according to claim 1, characterized in that the permanent magnets applied to the base of the core have alternating polarity and are located opposite each other with the same poles.  7. The method according to claim 1, characterized in that the permanent magnets applied to the base of the core have alternating polarity and are located opposite each other with opposite poles.

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