Cominco, Ltd.

Theodore J Seymour

John V Marlow

Randall T Sakauye

Gordon H Laurie

Paul Niessen

Albert M Vincze

Gerald P Lewis

Kenneth Daniel Geiger

Nai-Yong Tang

Patrick Culkeen

Steven Joseph Horvath

The strip is cast on a chilled casting surface of a rotating drum from a pool of the molten metal contained in a tundish having a graphite lip insert seated therein cooperating with, the casting surface adjacent to the tundish to form and contain the pool of the molten metal. The tundish preferably contains a feed chamber, a return chamber, and a diverting chamber, the feed chamber and the diverting chamber effectively removing turbulence from the molten feed and the return chamber having a vertically adjustable weir dividing the return chamber from the diverting chamber for controlling the surface level of the pool of molten metal in the diverting chamber and the lip insert and for diverting a flow of molten metal to the return chamber. A preferred lead alloy is a low antimony-lead alloy which is cast into strip and is subjected to a heat treatment to permit expansion and shaping in subsequent production of expanded mesh battery grids. The battery grids produced by the method have improved electrochemical properties such as corrosion resistance and resistance to growth.

Method and apparatus for producing metal strip

A method and an apparatus are disclosed for forming expanded mesh sheet from deformable strip by the steps of concurrently slitting and preforming the strip to provide transverse bands of slit and elongated wire segments projecting alternately from opposite sides of the plane of the strip separated by transverse bands of unslit strip, slitting the strip at alternate bands to extend slit segments in a staggered relation and laterally expanding the slit and preformed strip. Concurrent slitting and preforming and subsequent slitting can be effected by a cluster of three rolls or by a linear arrangement of pairs of opposed rolls. The invention has particular utility in forming expanded mesh sheet of exact final dimensions for use as battery grids from lead or lead alloy strip.

Forming expanded mesh sheet from deformable strip

A method of forming elongated slit segments in deformable strip includes concurrently slitting and preforming the strip by intermeshing substantially convexly shaped tool surfaces each having a linear leading portion and a linear trailing portion joined by a rounded apex portion. The linear leading and trailing portions are collinear with and generally define portions of the sides of a triangle which has a base with a length equal to the length of the strip being slit. The length of the side of the triangle corresponding to and collinear with the leading portion is less than the length of the side of the triangle corresponding to and collinear with the trailing portion, and the angle formed between the side of the triangle corresponding to the leading portion and the base is not greater than 90.degree..

Asymmetrical shaping of slit segments of meshes formed in deformable

An improved gear pump for pumping molten metals, such as molten lead or lead alloy, in which sealing means are provided to prevent loss of metal flowing axially along the pump drive shaft. A cooled annulus is provided about the pump drive shaft for solidifying molten metal therein which forms an effective seal and bearing.

Pump

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Oakville, Canada

Theodore J Seymour