Claims
- 1. An apparatus for heat treating a coil of a grain-oriented electromagnetic steel strip, comprising:
- a base plate on which the coil is to be positioned;
- an annular insulator for surrounding the outer peripheral surface of the coil in slightly spaced apart relation therefrom;
- a cylindrical insulator for positioning within the coil in slightly spaced apart relation from the inner peripheral surface of the coil;
- means provided below said base plate for moving the coil or said annular and cylindrical insulators vertically;
- an inner cover for surrounding the coil and said base plate;
- an outer cover surrounding said inner cover;
- heating means for heating the coil; and
- means for cooling the lower end of the coil during its heat treatment;
- said moving means being adapted to move the coil or said insulators vertically so that a temperature gradient of at least 2.degree. C./cm may be established along the height of the coil being heat treated.
- 2. An apparatus as set forth in claim 1, wherein said moving means comprises a mechanism for moving said annular and cylindrical insulators vertically along the height of the coil, while the coil is fixed.
- 3. An apparatus as set forth in claim 1, wherein said moving means comprises a mechanism for moving the coil along said annular and cylindrical insulators, while said insulators are fixed.
Parent Case Info
This application is a divisional of application Ser. No. 435,457 filed Oct. 4, 1982, now U.S. Pat. No. 4,500,366 issued Feb. 19, 1985.
US Referenced Citations (8)
Divisions (1)
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Number |
Date |
Country |
Parent |
435457 |
Oct 1982 |
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