Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1996-10-10
1999-05-11
Lin, Kuang Y.
Metal founding
Process
Shaping liquid metal against a forming surface
164437, 164493, 222593, B22D35/06
Patent
active
059017767
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for the inductive heating of a refractory mold part or guide member by means of an inductor device. The invention also relates to the corresponding mold part or guide member.
U.S. Pat. No. 3,435,992 discloses a pouring shell for the continuous pouring of liquid metal, in particular steel. The pouring shell is inductively heated before being brought into contact with the liquid metal. The pouring shell described in U.S. Pat. No. 3,435,992 has an electrically conductive insert which is provided in the pouring shell. In addition, the pouring shell is formed of an essentially electrically nonconductive refractory material. Through an induction coil, which encompasses the pouring shell and is essentially disposed coaxially with it, the electrically conductive insert, made of preferably a graphite part, can be heated by a current having a frequency of 3 to 50 kHz. However, only the electrically conductive insert absorbs induction energy and is inductively heated. In contrast, the pouring shell is heated through thermal conduction.
U.S. Pat. No. 4,940,870 teaches of providing an entirely or partially continuous slot within a shell made of an electrically conductive material and encompassed partially by an induction device. The slot, in turn, suppresses the heating of the shell.
FR 2,609,914 discloses a pouring shell with an outer portion that can be heated inductively. Several tubes are set into the outer portion forming the pouring opening. The heat generated by the induction energy is transferred through thermal conduction to the tubes forming the pouring opening.
The disadvantage of the prior art devices described above is that the induction heat is not transferred directly but rather only through thermal conduction to the entire guide member. This is particularly the case when the guide member is not encompassed completely by the inductor device but more or less "projects" from the inductor device.
This is often unavoidable since no other solution is possible for spatial reasons. In such cases the guide member is heated extremely nonuniformly, which can lead to stress fractures and other problems.
SUMMARY OF THE INVENTION
The present invention therefore addresses the problem of the prior art by disclosing an improved and variable method for the inductive heating of a guide member as well as disclosing the corresponding guide member.
The method according to the invention permits the rapid and uniform inductive heating of a molten metal guide member even in regions where inductively generated main electromagnetic field does not extend. An inductor device can thus be placed at a noncritical and constructionally favorable location of the guide member and yet, the entire guide member can be uniformly heated inductively.
In a preferred embodiment of the invention the guide member is a ceramic immersion casting tube for introducing metal melt into a melt sump, in particular into a chill mold for generating thin plate slabs or bands. The immersion casting tube projects into the chill mold. When the chill mold is filled, the immersion casting tube is immersed with its lower region in the metal sump covered with casting powder. The danger of bridge formation between the immersion casting tube and the chill mold wall, especially with thin plate slabs and immersion casting tubes, can be avoided through the capability of heating the immersion casting tube in the region encompassed by the chill mold by an inductor device disposed above the chill mold. Moreover, the casting powder can be melted thus improving the reproducibility of the method or the quality of the product. At the same time, the danger of clogging is decreased.
In another preferred embodiment of the invention the guide member is a ceramic feed channel for placing metal melt onto a conveying belt.
A guide member according to the invention, which is used in particular for introducing or placing metal melt, has an electrically conductive layer provided in a longitudinal direction with a continuou
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patent: 4784209 (1988-11-01), Hlinka et al.
patent: 4940870 (1990-07-01), Shibata et al.
patent: 5156202 (1992-10-01), Sick et al.
patent: 5198017 (1993-03-01), Mourer et al.
patent: 5325906 (1994-07-01), Benz et al.
Bruckner Raimund
Grau Rudiger
Grimm Daniel
Hashemi Seyed Masoud
Spitzer Karl-Heinz
Didier-Werke AG
Lin Kuang Y.
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