CN113322366B - A contact type rapid annealing equipment - Google Patents

Abstract

The invention discloses a contact type rapid annealing device, the device includes a conveying device, a heat treatment device, a cooling device and a winding device, the heat treatment device includes a metal/graphite composite material heating body, and the metal/graphite composite material heats The contact part between the body and the thin metal strip is provided with an atmosphere protection device, the cooling device includes a cooling cylinder, and the thin metal strip is sent from the conveying device through the heat treatment device for contact annealing heat treatment and then enters the cooling cylinder for processing. After the cooling treatment, the winding recovery is finally completed by the winding device. The invention performs annealing heat treatment on the metal thin strip through contact heating, and the highest heating rate can reach 105-106K/s, which can not only realize continuous rapid annealing, greatly shorten the annealing process flow, improve production efficiency, and reduce the use of energy consumption. , which reduces the cost of thermal processing and is of great significance to actual production.

Description

A contact type rapid annealing equipment

technical field

The invention relates to the technical field of rapid heat treatment of metal materials, in particular to a contact type rapid annealing equipment for Fe-P-C-B amorphous metal thin strips.

Background technique

Annealing is a heat treatment process in which the metal is heated to a certain temperature, kept for a certain period of time, and then cooled at a suitable rate. There are many process parameters involved in annealing heat treatment, including annealing temperature, heating rate, holding time, cooling rate and atmosphere protection. Through appropriate annealing heat treatment, optimization effects such as stress relief, material performance improvement, and special microstructure generation can be achieved. stress, and precipitation of α-Fe grains to form a highly fine nanostructure, its saturation magnetization increased from 161.34emu/g to 172.76emu/g, coercivity decreased from 12.8A/m to 7.6A/m, resistivity It is increased from 185 μΩ·cm to 200 μΩ·cm, and the bending toughness is still maintained after annealing treatment, which is of great significance for practical production.

At present, the annealing method of iron-based amorphous metal thin strips commonly used in the industry is carried out in a heat treatment furnace. By heating the entire furnace body, the furnace has suitable annealing conditions, and then the staff uses a rod-shaped carrier to anneal the coil. The wound amorphous thin strips are connected in series and put into the heat treatment furnace. After the heat treatment is completed, the carrier is taken out to unload the thin strips, and then the heat treatment of the next batch of amorphous thin strips is performed again. This heat treatment method not only uses high energy consumption and low production efficiency, but also requires a lot of labor for the series and disassembly of amorphous thin strips, and even exposes the staff to the risk of high temperature burns. The latent heat of crystallization occurs inside the crystalline alloy, and at the same time, Fe ₃ (B, P, C) compounds that are unfavorable to the soft magnetic properties are formed, which reduces the saturation magnetization of the alloy. In addition, the current furnace annealing method commonly used in the industry makes the amorphous strip brittle after annealing, and is prone to breakage during subsequent storage, handling and transformer assembly, which is one of the problems that limit its wide application. In recent years, improving the annealing brittleness of amorphous alloys has become a key research object of many researchers.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a contact type rapid annealing equipment, which can improve production efficiency, improve material performance, reduce labor and material costs, and be safe and environmentally friendly.

The technical scheme adopted in the present invention is:

A contact type rapid annealing equipment, comprising a conveying device 1, a heat treatment device 2, a cooling device 3 and a winding device 4 arranged in sequence, the conveying device 1 includes a conveying roller 11 and a thin metal strip 12, and the thin metal strip is 12 rolls Winding on the conveying roller 11, the movable end of the thin metal strip is connected with the winding device after passing through the heat treatment device and the cooling device;

The heat treatment device 2 includes a heating body 21, a rotating shaft, a bracket and a heating source, the heating body is a ring structure, the heating body is arranged on the bracket through the rotation of the rotating shaft, the heating source is arranged below the heating body, and the heating body is heated. The upper end face of the body is in contact with the thin metal strip;

The cooling device 3 includes a cooling cylinder 31 and a cooling source. The two ends of the cooling cylinder 31 are respectively provided with a feeding port and a discharging port for the passage of the thin metal strip. The bottom of the cooling cylinder is provided with a feeding port and a discharging port. The inlet pipe 32 and the outlet pipe 33, the inlet pipe communicates with the air outlet of the cooling source, and the outlet pipe communicates with the atmosphere.

It also includes an atmosphere protection device 22, the atmosphere protection device 22 includes a cover body and a protective gas source, the cover body is placed above the heating body, and both sides of the cover body are also provided with metal thin A feeding port and a discharging port are provided, and one side of the other two sides of the cover body is provided with an air injection hole, and the air injection hole is communicated with the air outlet of the protective gas source.

The heating body is a metal/graphite composite heating body 21 .

The metal in the heating body adopts iron and iron alloy, the graphite is flake graphite, and the volume ratio of metal to graphite ranges from 50 to 95:5 to 50.

A power device is also included, and the power device is used to make the heating body rotate in the opposite direction to the traveling direction of the metal thin strip.

The power device is a power motor, and the output shaft of the power motor is fixedly connected with the heating body.

When annealing the Fe-P-C-B iron-based amorphous metal strip 12 with a thickness of 15-30 μm, the surface temperature of the metal/graphite composite heating body 21 should reach at least 500° C. The metal strip 12 and the heating body 21 The contact time should be controlled within 0.3~1.2s.

The protective gas source is composed of one or several mixtures of argon and nitrogen.

The invention performs annealing heat treatment on the metal thin strip through contact heating, and the highest heating rate can reach 105-106K/s, which can not only realize continuous rapid annealing, greatly shorten the annealing process flow, improve production efficiency, and reduce the use of energy consumption. , reducing thermal processing costs. Further, the overall structure of the present application is simple and easy to operate, which can meet the needs of large-scale industrial applications, and is of great significance to actual production.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the top view of the atmosphere protection device of the present invention;

Fig. 3 is the differential scanning calorimeter (DSC) curve diagram of Fe ₈₅ P ₁₁ C ₂ B ₂ amorphous thin ribbon of the embodiment of the present invention under different heating rates;

FIG. 4 is an X-ray diffraction (XRD) pattern of the Fe ₈₅ P ₁₁ C ₂ B ₂ amorphous ribbon according to the embodiment of the present invention;

FIG. 5 is a hysteresis loop diagram of the Fe ₈₅ P ₁₁ C ₂ B ₂ amorphous thin ribbon according to the embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figures 1 and 2, the present invention includes a conveying device 1, a heat treatment device 2, a cooling device 3 and a winding device 4 which are arranged in sequence. The conveying device 1 includes a conveying roller 11 and a thin metal strip 12. The thin metal strip 12 is wound on the conveying roller 11, and the movable end of the thin metal strip is connected to the winding device after passing through the heat treatment device and the cooling device; the winding device 4 includes the winding roller 41 and the annealed metal thin strip 42, The annealed metal thin strip 42 is wound and collected by electric drive.

The heat treatment device 2 includes a metal/graphite composite heating body 21 , a rotating shaft 23 , a bracket 24 and a heating source (not shown in the figure). On the bracket 24, the heating source is arranged below the heating body, and the upper end face of the heating body 21 is in line contact with the thin metal strip 12; The contact area between the heating body and the thin metal strip is achieved by the vertical height difference between the contact position with the thin metal strip and the conveying roller and the winding roller 41. As shown in the figure, on the platform 5, the distance between the conveying device 1 and the winding device is The heights are all lower than the height of the highest point of the heat treatment device 2 .

The cooling device 3 includes a cooling cylinder 31 and a cooling source. The two ends of the cooling cylinder 31 are respectively provided with a feeding port and a discharging port for the passage of the thin metal strip. The bottom of the cooling cylinder is provided with a feeding port and a discharging port. The inlet pipe 32 and the outlet pipe 33 are connected with the air outlet of the cooling source, and the outlet pipe is connected with the atmosphere; by setting the cooling source, the cooling temperature can be well controlled by controlling the air outlet rate of the cooling source.

It also includes an atmosphere protection device 22, the atmosphere protection device 22 includes a cover body and a protective gas source (not shown in the figure), the cover body is placed above the heating body, and both sides of the cover body are also A feeding port and a discharging port are respectively provided for the metal thin strip to pass through, and one side of the other two sides of the cover body is provided with an air injection hole, and the air injection hole is communicated with the air outlet of the protective gas source. The contact part of the metal/graphite composite heating body 21 and the metal strip 12 is provided with an atmosphere protection device 22. By setting the atmosphere protection device 22, the metal strip can be kept in an inert gas range during the annealing process, so as to avoid Interaction between air and air.

The cooling device 3 includes a cooling cylinder 31, the bottom of the cooling cylinder 31 is provided with an inlet pipe 32 and an outlet pipe 33, and the thin metal strip 12 is sent from the conveying device 1 and passes through the heat treatment device 2 for contact annealing heat treatment. After entering into the cooling cylinder 31 for cooling treatment, the winding and recovery is finally completed by the winding device 4 .

The heating body is a metal/graphite composite heating body 21 . The metal in the heating body adopts iron and iron alloy, the graphite is flake graphite, and the volume ratio of metal to graphite ranges from 50 to 95: 5 to 50. The specific heat capacity of the heating body exceeds 500J/(kg·K within this ratio range. ), and the thermal conductivity is greater than 60W/(m·K), which is sufficient to ensure the heat conduction efficiency when the thin metal strip is in contact with the heating body.

A power device is also included, and the power device is used to make the heating body rotate in the opposite direction to the traveling direction of the metal thin strip. The power device includes a power motor, and the output shaft of the power motor is fixedly connected with the heating body. By arranging the power device, the heating body can be rotated in the opposite direction to the traveling direction of the metal thin strip, so that the contact between the heating body and the metal thin strip can be more tightly under the action of the reverse force, thereby improving the annealing effect.

The metal/graphite composite heating body 21 is a high thermal conductivity material, and the volume ratio of the metal strip 12 to the heating body 21 is in the range of 1:105~108 when in contact, so that the metal strip 12 completely contacts the surface of the heating body 21 after the internal atoms The high-frequency thermal vibration is rapidly initiated, thereby realizing the rapid annealing process of the metal strip 12 .

The annealing heat treatment is realized by contact heating the metal strip 12 through the metal/graphite composite heating body 21, and the heating rate is adjusted by controlling the temperature difference between the heating body and the metal strip, and the heating rate can reach 105~106K/s at most , control the speed of the metal strip 12 passing through the metal/graphite composite heating body 21 to adjust the annealing time, and control the temperature of the heating body 21 to adjust the annealing temperature.

Combined with the DSC curve analysis and experimental characterization results, it can be obtained that when the Fe-P-C-B iron-based amorphous metal strip 12 with a thickness of 15-30 μm is annealed, the surface temperature of the metal/graphite composite heating body 21 should reach at least 500 ° C , the contact time between the thin metal strip 12 and the heating body 21 should be controlled within 0.3~1.2s.

The gas injection holes are used to introduce protective gases such as argon and nitrogen into the atmosphere protection device 22, so that the thin metal strip 12 is annealed under the protective atmosphere, so as to avoid the occurrence of oxidation reaction and precipitation of hard magnetic phases that are unfavorable to the soft magnetic properties. .

In order to facilitate the understanding of the design scheme of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. In addition to the embodiments described below, the present invention can also be implemented in other different forms, and it should be understood that the following embodiments are only used to illustrate the present invention and do not limit the application scope of the present invention.

The thin metal strip 12 is sent out from the conveying device 1 , passes through the heat treatment device 2 for contact annealing heat treatment, enters the cooling cylinder 31 for temperature reduction treatment, and is finally wound and recovered by the winding device 4 .

The specific embodiment of the present invention: the Fe85P11C2B2 amorphous metal strip with a thickness of 20 μm and a width of 10 mm is rapidly annealed by a contact type rapid annealing equipment of the present invention, and the surface temperature of the metal/graphite composite heating body 21 is controlled to be 500 ~600℃, control the contact time between the thin metal strip 12 and the heating body between 0.3~1.2s, as shown in Figures 3, 4 and 5, the saturation magnetization can be increased from 161.34emu/g to 172.76emu/g , the coercivity is reduced from 12.8A/m to 7.6A/m, the resistivity is increased from 185μΩ·cm to 200μΩ·cm, and the bending toughness is still maintained after annealing.

The contact type rapid annealing equipment of the present invention is different from the conventional furnace annealing heat treatment method commonly used in the industry. The heat treatment of the metal thin strip through the contact type heating can reach a heating rate of 105~106K/s at the highest, which can not only achieve continuous Rapid annealing greatly shortens the annealing process flow, improves production efficiency, reduces energy consumption, and reduces thermal processing costs. In addition, the contact type rapid annealing equipment in the present invention is simple in structure and easy to operate, can meet the needs of large-scale industrial application, and has important significance for actual production.

After reading the basic principles, main features and advantages of the present invention, those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and changes or modifications can be made to the present invention without departing from the spirit and scope of the present invention. Modifications, such changes or modifications all fall within the scope defined by the appended claims of the present application. In order to facilitate the understanding of the design scheme of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. In addition to the embodiments described below, the present invention can also be implemented in other different forms, and it should be understood that the following embodiments are only used to illustrate the present invention and do not limit the application scope of the present invention.

In the description of the present invention, it should be noted that for orientation words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower" , "Front", "Back", "Left", "Right", Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise The indicated orientation and positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation or be constructed in a specific orientation. and operation should not be construed as limiting the specific protection scope of the present invention.

It should be noted that the terms "first", "second" and the like in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances for the embodiments of the application described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, eg, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

Note that the above is only the preferred embodiment of the present invention and the technical principle of its application. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the specific embodiments described herein, and can also include more other effective embodiments without departing from the concept of the present invention. The scope of the invention is determined by the scope of the appended claims.

Claims (5)

1. A contact type rapid annealing device, characterized in that: it comprises a conveying device (1), a heat treatment device (2), a cooling device (3) and a winding device (4) arranged in sequence, and the conveying device (1) ) includes a conveying roller (11) and a thin metal strip (12), the thin metal strip (12) is wound on the conveying roller (11), and the movable end of the thin metal strip is connected to the winding device after passing through a heat treatment device and a cooling device ; The heat treatment device (2) comprises a heating body (21), a rotating shaft, a bracket and a heating source, the heating body is a ring structure, the heating body is rotated and arranged on the bracket through the rotation shaft, and the heating source is arranged on the heating body Below the heating body, the upper end face of the heating body is in contact with the thin metal strip; The cooling device (3) includes a cooling cylinder (31) and a cooling source, and both ends of the cooling cylinder (31) are respectively provided with a feeding port and a discharging port, which are used for the passage of the thin metal strip and cooling The bottom of the cylinder body is provided with an inlet pipe (32) and an outlet pipe (33), the inlet pipe is communicated with the air outlet of the cooling source, and the outlet pipe is communicated with the atmosphere; It also includes an atmosphere protection device (22), the atmosphere protection device (22) includes a cover body and a protective gas source, the cover body is covered above the heating body, and the two sides of the cover body are also respectively arranged There are feed ports and discharge ports for the thin metal strips to pass through, and one side of the other two sides of the cover body is provided with air injection holes, and the air injection holes are communicated with the air outlet of the protective gas source; The heating body is a metal/graphite composite heating body (21); A power device is also included, and the power device is used to make the heating body rotate in the opposite direction to the traveling direction of the metal thin strip. 2. contact type rapid annealing equipment according to claim 1, is characterized in that: the metal in the described heating body adopts iron and iron alloy, and graphite is flake graphite, and the volume ratio scope of metal and graphite is 50～95: 5~50. 3 . The contact type rapid annealing equipment according to claim 1 , wherein the power device is a power motor, and the output shaft of the power motor is fixedly connected to the heating body. 4 . 4. The contact type rapid annealing equipment according to claim 1, characterized in that: when the Fe-P-C-B iron-based amorphous metal thin strip (12) with a thickness of 15-30 μm is annealed, the metal/ The surface temperature of the graphite composite heating body (21) should reach at least 500°C, and the contact time between the metal strip (12) and the heating body (21) should be controlled within 0.3~1.2s. 5 . The contact type rapid annealing equipment according to claim 1 , wherein the protective gas source is composed of one or more mixtures of argon and nitrogen. 6 .

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