HEATED CONTROL PIN
First Claim
1. A control pin for controlling flow of molten metal through a down spout in a casting process, the control pin comprising:
- a body having an elongated shape, a lower portion insertable in the down spout, and a terminal end, opposite the lower portion, the body comprising;
a central core;
a heating element disposed around the central core,an intermediate layer surrounding the central core and encasing the heating element; and
an outer shell surrounding the intermediate layer.
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Accused Products
Abstract
A control pin for controlling the flow of molten metal through a down spout in a casting process is provided. The control pin comprises a body having an elongated shape, a lower portion insertable in the down spout, and a terminal end, opposite the lower portion. The body includes a central core, preferably a hollow tube or a rod of alumina or mullite; a heating element disposed around the central core, and an intermediate layer surrounding the central core and encasing the heating element, the intermediate layer being made of a solidified ceramic putty. Finally, an outer shell, preferably made of woven fiber reinforcing fabric in a matrix of ceramic, surrounds the intermediate layer.
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Citations
29 Claims
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1. A control pin for controlling flow of molten metal through a down spout in a casting process, the control pin comprising:
a body having an elongated shape, a lower portion insertable in the down spout, and a terminal end, opposite the lower portion, the body comprising; a central core; a heating element disposed around the central core, an intermediate layer surrounding the central core and encasing the heating element; and an outer shell surrounding the intermediate layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 29)
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24. A control pin for controlling a flow of molten metal through a down spout in a casting process, the control pin comprising:
a body having an elongated shape, a lower portion insertable in the down spout, and a terminal end, opposite the lower portion, the body comprising; a tube or rod made of alumina or mullite; a resistive wire wrapped around the tube or rod; an intermediate layer of dried and solidified ceramic putty, surrounding the tube or rod and encasing the resistive wire; a tip made of an electrically insulating and heat conducting material, located below the tube or rod and the intermediate layer, and an outer shell surrounding the tip and the intermediate layer, the outer shell comprising multiple layers of reinforcing fabric, embedded in a ceramic matrix.
Specification