Semi-hot metallic extrusion-coating method
OwnerAnthony J. Raymondinventor
Life of this patent
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Abstract
A method and apparatus for use in continuously applying molten coating metal, such as in galvanizing or aluminizing to tubes, rods, wire or other work pieces passing through a metallic bath. The molten metal in a reservoir is discharged onto the tube or rod, the metal flowing around the tube or rod being controlled by a splash tube. The coating metal is progressively agitated and cooled within the splash tube, after which the tubing or rod is accurately centered to exit the splash tube with an even coating of the desired thickness, such coating being in a stable condition. The entire system is enclosed in an inert atmosphere eliminating the formation of "galvanizers' dross", oxides of aluminum, etc.
Claims9
A method of providing a uniform metallic coating on a moving work piece, comprising the steps of:
- moving a said workpiece in a fixed path, including passage through a splash tube;
- surrounding the work piece with molten metal during said movement;
- containing the molten metal in close proximity to the work piece throughout its coating movement within the splash tube;
- agitating progressively the contained molten metal with a series of spiral ribs positioned toward the exit end of the splash tube;
- cooling the molten metal to approach a plastic state as it moves in the direction of work piece movement past the splash tube;
- and
- uniformily confining the thickness of the molten metal in its plastic state around the work piece as it cools to extrude a sized, stable coating on the work piece.
The method of claim 3, wherein the plastic state of the cooled metal effects damming of the molten coating metal upon stoppage of work movement.
A method of providing a uniform metallic coating on a number of separate work pieces comprising the steps of:
- heating the metal to provide a source of molten metal;
- simultaneously moving the work pieces in separate paths including passage through a respective separate splash tube;
- surrounding each work piece with molten metal from said source during said movement thereof;
- containing the molten metal in close proximity to the work pieces throughout its coating movement within the respective splash tubes;
- agitating pregressively the contained molten metal with a series of spiral ribs positioned toward the exit end of the splash tubes;
- cooling the molten metal on the work pieces to approach a plastic state during movement of said workpieces past the splash tubes;
- and
- uniformly extruding and confining the cooled metal on the work pieces during said movement past the splash tubes to simultaneously produce a number of separate work pieces with uniform stable coatings.
Dependencies are inferred from the claim text.