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US 5,308,946 AGranted
Induction heating apparatus and method for heating metal strips and slabs
OwnerGlenn R. Mohrinventor
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OwnerGlenn R. Mohrinventor
Estimating the term…
This disclosure relates to an apparatus for and a method of electrical inductance heating of metal strips and slabs. The heating method involves a plurality of pairs of individual electrical coils exposed on opposite sides of a path of movement of a metal strip or slab wherein the coils are elongated longitudinally of the path of movement of the metal member, such as a strip or slab, whereby the pattern of heating is in the way of stripes. Further, to eliminate any pulsing of current within the strip or slab being heated, each coil is spaced from a transversely adjacent coil a distance corresponding substantially to the effective heating width of that coil. The coils of a next longitudinal adjacent set of coils are transversely offset relative to the coils of the first mentioned set of coils so that each coil of the second set is aligned with a space between coils of the first set. This provides for a heating of the strip or slab in stripes and prevents overheating of the edges of the strip or slab. Further, the energization of the individual coils may be controlled in accordance with the existing temperature of that area of a strip or slab to be heated by the coils so as to heat a non-uniformly heated strip or slab to a uniform overall temperature.
An apparatus for heating moving elongated metal members selectively in the form of a metal strip and slab, said apparatus comprising pairs of cooperating elongated electrical coils, said coil pairs being in spaced parallel relation to define a coil elongation, coils of each of said pairs being in spaced parallels relation to form a space therebetween, the space between soils of said pairs of coils defining a path for moving members between said coils extending longitudinally of the coil elongation, and said pairs of coils including a plurality of coil sets spaced longitudinally of one another, said coil sets including first and second coil sets with pairs of coils in each of said coil sets being spaced transversely of said path and pairs of coils in one of two longitudinally adjacent coil sets being transversely offset from pairs of coils in the other of said longitudinally adjacent coil sets, wherein said coils provide means for forming in a member moving longitudinally of said coils first transversely alternating heated and non-heated strip-like areas and then heating only said non-heated strip-like areas.
An apparatus for electrical induction heating metal member in the form of strips and slabs, said apparatus comprising a path for a moving metal member defined by spaced opposed pairs of coils arranged in groups on opposite sides of said path, said coils of each group of pairs of coils including sets of longitudinally extending coils arranged in transversely spaced relation, coils of longitudinally adjacent sets being arranged with coils in one set being aligned with spaces between coils in a next set to provide means for heating a metal member moving along said path to first define heated longitudinal areas separated by unheated longitudinal areas and then heating said heated area without further heating said unheated areas.
A method of reheating a previously heated metal member selectively in the form of a strip and slab, said method comprising the steps of providing a plurality of pairs of electrical coils defining a path for movement of a member with pairs of electrical coils being elongated longitudinally opposite sides of said path, and said pairs of electrical coils being spaced both transversely of said path and longitudinally of said path in alternating relation with coils of a transverse set being aligned with spaces between coils of a next adjacent transverse set, and passing a heated member along said path to further heat said member.
Dependencies are inferred from the claim text.