JP5687359B2 - Heat treatment equipment for annealing process - Google Patents

Description

  The present invention relates to a heat treatment apparatus for an annealing process, and more specifically, an annealing process capable of reducing temperature deviation in a coil by making heat transfer uniform not only at the upper part but also at the lower part of the coil. The present invention relates to a heat treatment apparatus.

  In order to make the magnetic steel sheet have directionality during the manufacturing process of the magnetic steel sheet, a COF (Continuous Open Frame Furnace) process is performed in which the coil is cooled after being maintained at a high temperature of about 1000 ° C. for a certain period.

  As shown in FIGS. 1 and 2, the heat treatment apparatus used in the conventional COF process includes a circular plate 10 on which a coil 50 is placed, and an upper support that is formed of a refractory and prevents the circular plate 10 from being bent. 20, a lower support 30 arranged radially at the lower part of the upper support 20, and a burner which is fixed to the sand 61 of the floor 60 and covers the circular plate 10, the upper support 20 and the lower support 30 and is an external atmosphere gas The cover 40 is configured to block direct contact between the combustion atmosphere and the hydrogen atmosphere gas which is the internal atmosphere gas.

  However, in the case of such a conventional technique, if the cover is heated by radiant heat transfer from an external heating source or cooled by convective heat transfer from an external cooling source, the corresponding heat is transferred to the coil inside the cover. At this time, the upper part of the coil is heated / cooled by the heat of the cover, but the lower part of the coil is heated / cooled through a circular plate heated / cooled by the heat of the cover. There was a difference in the heat temperature transmitted to the lower part, resulting in a temperature deviation.

  In particular, the material of the upper support is made of a refractory material, which reduces the heat transfer efficiency of the circular plate and deepens the temperature deviation in the coil. The deviation is increased and the magnetic quality of the coil is reduced.

  Thus, there is a demand for a technique that can efficiently transfer external heat not only to the upper part of the coil but also to the lower part to reduce the temperature deviation in the coil.

  SUMMARY OF THE INVENTION An object of the present invention to solve such problems is to provide a heat treatment apparatus for an annealing process that can increase the amount of heat flowing into the lower part of the coil and reduce the temperature deviation in the coil during heat treatment. That is.

  In order to achieve the above object, a heat treatment apparatus for an annealing process according to the present invention is a heat treatment apparatus for an annealing process in which heat is transferred from an external heat source in the annealing process, and includes a base plate on which a coil is placed, and the coil. A lower portion is opened so as to surround the cover, and a lower open portion that is opened is sealed to an edge of the base plate, and a heat transfer space portion that transmits radiant heat transfer from an external heat source is formed below the base plate. Includes a support unit for supporting a lower portion of the base plate.

  Preferably, a sealing groove portion filled with a sealing member is formed at an edge of the base plate, and the lower open portion is inserted into the sealing member.

  Preferably, the base plate is made of a steel material having a feature excellent in heat transfer, and transmits a heat source transmitted through the heat transfer space to the lower portion of the coil.

  Preferably, the support unit includes a central support piece disposed on a lower central side surface of the base plate, and a plurality of deployment support pieces radially disposed on the lower lateral surface of the base plate.

  Preferably, each of the plurality of deployment support pieces includes a first support piece that extends longer toward the center support piece and a second support piece that extends shorter than the first support piece.

  According to the present invention, by directly exposing the base plate on which the coil is placed to an external heat source, the heating / cooling rate of the coil is significantly improved, and the temperature deviation in the coil that greatly affects the magnetic quality of the coil in the COF process is reduced. There is an advantage that it can be significantly reduced.

It is the side view which showed the heat processing for the annealing process by a prior art. It is the expansion perspective view which expanded and showed the A section of FIG. It is the side view which showed the heat processing for the annealing process by this invention. It is the expansion perspective view which expanded and showed the B section of FIG. It is the graph which showed the temperature distribution difference in the coil of the heat processing apparatus for annealing processes by this invention.

  First, in assigning reference numerals to the constituent elements of each drawing, it should be noted that the same constituent elements have the same reference numerals as much as possible even if they are displayed on other drawings. Further, in the description of the present invention, when it is determined that a specific description of a related well-known configuration or function may detract from the gist of the present invention, a detailed description thereof will be omitted. To do.

  Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIGS. 3 to 4, the heat treatment apparatus for the annealing process according to the present invention efficiently heats the coil 400 in the annealing process by radiant heat transfer through the cover 200 and heat conduction through the base plate. / Cooling is implemented to reduce the temperature deviation in the coil 400. In this embodiment, an external heating source that is heated by radiant heat transfer and an external cooling source that is convective heat transferred are collectively referred to as an external heat source.

  The heat treatment apparatus for realizing this includes a base plate 100 on which the coil 400 is placed, a cover 200 that is sealed to the edge of the base plate 100 so as to surround the coil 400, and a heat transfer space 520 formed on the lower side of the base plate 100. As shown, the support unit 300 supporting the lower part of the base plate 100 is included.

  The base plate 100 has a circular plate shape on which the coil 400 is placed, and a heat transfer space 520 is formed on the lower side of the base plate 100 and is directly exposed to an external heat source. For this reason, the base plate 100 is made of a material having excellent thermal conductivity. However, in this embodiment, a steel material that can effectively transmit an external heat source to the coil 400 side is used. .

  The base plate 100 is made of a steel steel 1 material having excellent heat transfer characteristics, and a cover 200 surrounding the coil 400 is coupled to the base plate 100. At this time, in order to realize an effective sealing effect therebetween, a sealing groove portion 110 is filled in the edge of the base plate 100 and the sealing member 510 in the sealing groove portion 110 is covered with a cover. The lower opening 210 of the 200 is inserted so as to be sealed.

  The cover 200 has a structure in which a lower part is opened so as to surround the coil 400, and the lower opening 210 to be opened is coupled to the sealing groove 110 of the base plate 100. The cover 200 blocks the external atmospheric gas and the internal atmospheric gas in the cover 200, but acts as a primary heating / cooling source for heating / cooling inside the cover 200, and the coil is indirectly heated / cooled by the cover 200. The top of 400 is secondary heated / cooled.

  In particular, in the case of the prior art, the circular plate on which the coil is placed is supported by the upper support and the lower support, and these structures are surrounded by the cover, so that heat is mainly transferred to the upper part of the coil through the cover. On the other hand, in the present invention, the cover 200 surrounds only the base plate 100 and the heat transfer space 520 is formed on the lower side of the base plate 100. Heat can be transferred to the lower part of the coil 400 through 100.

  As described above, by exposing the upper and lower portions of the base plate 100 to the heat source of the external atmospheric gas, the heat transfer efficiency with respect to the upper and lower portions of the coil 400 can be maximized. The time difference of cooling can be eliminated and the temperature deviation in the coil 400 can be minimized.

  A support unit 300 is provided below the base plate 100. The support unit 300 supports the lower part of the base plate 100 so that the heat transfer space 520 is formed in the lower part of the base plate 100. Preferably, the support unit 300 is refractory to prevent the base plate 100 from being bent due to creep deformation. Consists of material.

  The support unit 300 includes a center support piece 310 and a deployment support piece 320 that are spaced apart from each other with the heat transfer space 520 interposed therebetween. The center support piece 310 is formed of a circular support piece that supports the lower central side surface of the base plate 100, and the deployment support piece 320 is a first support that is radially arranged around the central support piece 310 on the lower side surface of the base plate 100. The pieces 321 and the second support pieces 322 are alternately arranged. Here, since the second support piece 322 is formed to be shorter than the first support piece 321, an efficient layout design of the support piece is realized, and a sufficient heat transfer space is secured under the base plate 100. Can do.

  As shown in FIG. 5, the heat treatment apparatus of the present invention has a higher rate of heat cycle during heat treatment than the prior art, and the temperature difference between the highest temperature part and the lowest temperature part in the coil 400 is higher. It was confirmed that the temperature decreased by 100 ° C. in the heating zone compared to the prior art. In addition, although the upper heating / cooling of the coil 400 by the cover 200 shows the same efficiency as the prior art, it has been shown that the lower heating / cooling of the coil 400 by the base plate 100 is significantly improved compared to the prior art. .

  As described above, the present invention significantly improves the heating / cooling rate for the upper and lower portions of the coil 400 by directly exposing the base plate 100 on which the coil 400 is placed to an external heat source, thereby reducing the temperature deviation in the coil 400. The magnetic quality of the coil 400 can be improved in the COF process.

  Although the present invention has been described in detail using preferred embodiments, the scope of the present invention should not be limited to the feature embodiments, but should be construed in accordance with the appended claims. is there. Moreover, it should be understood by those skilled in the art that many modifications and variations can be made without departing from the scope of the present invention.

100 Base Plate 200 Cover 300 Support Unit 400 Coil 510 Sealing Member 520 Heat Transfer Space

Claims (5)

A heat treatment apparatus for an annealing process in which heat is transferred from an external heat source in the annealing process,
A base plate on which the coil is placed;
A cover whose lower part is opened so as to surround the coil, and whose lower open part is sealed to an edge of the base plate;
Have a, a support unit for supporting the lower portion of the base plate so that the heat transfer space to a lower radiant heat transfer by external heat source is transferred is formed of the base plate,
The support unit includes a center support piece disposed on the lower center side surface of the base plate, and a plurality of deployment support pieces radially disposed on the lower side surface of the base plate,
The plurality of deployment support pieces include: a first support piece that extends longer toward the center support piece; and a second support piece that extends shorter than the first support piece.
It said second support piece, heat treatment for annealing the second support piece and the first support piece characterized that you located between the first support piece to be placed repeatedly in rotation apparatus.   The heat treatment apparatus for an annealing process according to claim 1, wherein a sealing groove portion filled with a sealing member is formed at an edge of the base plate, and the lower open portion is inserted into the sealing member.   2. The annealing process according to claim 1, wherein the base plate is made of a steel material having a feature excellent in heat transfer, and transmits a heat source transmitted through the heat transfer space to a lower portion of the coil. Heat treatment equipment.   The heat treatment apparatus for an annealing process according to claim 1, wherein the base plate has a circular plate shape so that a coil can be placed thereon.   2. The heat treatment apparatus for an annealing process according to claim 1, wherein the support unit is made of a refractory material in order to prevent the base plate from bending due to creep deformation. 3.

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