US2958742A

US2958742A - Conductor roll and method of making the same

Info

Publication number: US2958742A
Application number: US570374A
Authority: US
Inventors: James C Palmer
Original assignee: United States Steel Corp
Current assignee: United States Steel Corp
Priority date: 1956-03-08
Filing date: 1956-03-08
Publication date: 1960-11-01
Anticipated expiration: 1977-11-01
Also published as: DE1055914B

Description

J. c, PALMER 2,958,742

CONDUCTOR ROLL AND METHOD oF MAKING THE SAME Nov. l, 1960 Filed March B, 1956 m mm W NM m EL a Wm S E M M M .x B E 1.11% s .I lkl Patented Nov., l, 1950?() CONDUCTOR ROLL AND METHQD F MAKING THE SAME James C. Palmer, Gary, Ind., assignor to United States Steel Corporation, a corporation of New Jersey Filed Mar. s, 195s, ser. No. 570,374

2 claims. (Crm1- 1) This invention relates to a conductor roll and to a method of making the same and more particularly to a conductor roll for supporting and applying current to a steel strip being processed. In the manufacture of electrolytic tinplate it is necessry to apply current to the strip for cleaning, pickling and plating. lt is for such purpose that this conductor roll is particularly adapted. Conductor rolls are, of course, old but those of which I have knowledge are not satisfactory for various reasons. The initial cost may be high, the life may be short and/ or the current carrying capacity may be low.

It is therefore an object of my invention to provide a relatively inexpensive conductor roll having a long life and good electrical conducting characteristics.

Another object is to provide a method for making such a roll.

These and other objects will be more apparent after referring to the following specification and attached drawings, in which:

Figure 1 is a longitudinal sectional view of the roll of my invention; and

Figure 2 is an enlarged sectional view taken on the line II-II of Figure l.

Referring more particularly to the drawings, reference numeral 2 indicates a one-piece shaft. A pair of end bells or supports 4 are keyed to the shaft 2 by means of keys 6 and are also welded thereto, as shown. A barrel 8 is welded to the end bells 4. Plate supports or discs 10 are also preferably provided between the end bells 4 with the discs 10 being welded to the shaft 2 and barrel 8. Holes 12 are provided in the plates 10 to permit cooling water circulation. Openings 14 are provided in the ends of shaft 2 for delivering cooling water to and from the interior of the roll. Holes 16 are provided in the end bells 4 for a purpose which will appear later. The parts so far described are all made of steel. After these parts are fastened together a casing 18 is supplied over the entire surface of the roll body and shaft, as shown. The casing 18 is made of copper or a copper alloy of high electrical conductivity. The copper is supplied in molten form as by welding and may be therefore considered as a cast material. The casing 18 is then machined all over to size and dimension. 'I'he thickness of the casing is preferably between and 1/2 inch, The barrel portion of the casing is then electroplated with copper or a copper alloy 20. The copper plate 20' has a preferable thickness of between .003 and .005 inch. This copper plate iills up the pores in the casing 18. The copper plate 20 is shot blasted with shots having a screen size of .100 inch or less. The surface of coating 20 is then electroplated with chrome 22 to a thickness of about .004 to .005 inch. This chrome plate forms the strip supporting surface of the roll and will have a surface corresponding to the shot blasted surface of plating 20. It is `desirable that the shot be no rougher than that designated above so as to prevent the strip from carrying solution along with it. The holes 16 remain open until after manufacture of the roll is completed so that gases or vapors generated during manufacture can escape, thus preventing pressure build-up and explosions. The openings 16 are then plugged to make the roll water-tight.

While one embodiment of my invention has been Shown and described it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claims.

I claim:

l. A conductor roll comprising a steel shaft, a steel barrel, steel end supports extending between and fastened to said shaft and barrel, a relatively thick cast copper containing casing surrounding said shaft, barrel and supports, a relatively thin copper containing plating surrounding the casing on said barrel, and a chrome plating surrounding the copper containing plating, the surface between said platings being rough.

2. The method of making a conductor roll comprising fastening a pair of steel end supports in spaced relationship to -a steel shaft intermediate the ends of the shaft, fastening a steel barrel to said end supports, applying in molten form a relatively thick layer of copper containing material around said shaft, barrel and supports, machining the outer surface of said copper containing layer, electroplating a relatively thin coating of copper containing material on the copper containing layer on said barrel, shot blasting the surface of said coating, then electroplating a relatively thin coating of chromium to the copper containing coating.

References Cited in the le of this patent UNITED STATES PATENTS 2,217,015 Gurwick et al Oct. 8, 1940 2,439,858 Muddiman et al Apr. 20, 1948 2,526,312 Winterhalter Oct. 17, 1950