US364157A

US364157A - Jambs s

Info

Publication number: US364157A
Authority: US
Publication date: 1887-05-31
Anticipated expiration: 1904-05-31

Description

UNITED STATES PATENT OFFICE.

JAMES s. ATKINSON, or PITTSBURG, PENNSYLVANIA, ASSIGNOR 'ro .IoNEs &

LAUGHLINS, (LIMITED,) OF'SAME PLACE MANUFACTURE OF ROLLS.

SPECIFICATION forming part of Letters Patent No. 364,157, dated May 31 1887. 7

Application filed February 3, 1887.

casting the same in molds formed either ofsand or metal. The roll is then turned or ground downto the desired shape and size.

I This method is objectionable, not only on account of the labor, difficulty and expense of forming the mold and turning down the roll, the frequent formation of flaws and blow-holes, which are only discoverable when the roll is in use, but also on account of the transverse weakness of rolls having no internal defects.

The object of the invention herein is to so construct both plain and grooved rolls for the reduction of metals that they shall have not 2 only a greater transverse strength, be more easily and cheaply made, but shall also be stronger and more durable.

In the practice of my invention I cast an ingot, either of Bessemer, open-hearth, or cru- 0 oible steel, of a length approximately equal to the length of the roll to be formed, and of a transverse area considerably larger than that desired in the finished roll. This ingot,which may be either square, round, or of any other desired transverse section, is then reduced, either by rolling or forging, or by rolling and forging, to approximately the size of the finished roll. The necks and wabblers are then formed on the ends of the shaped ingot or 0 forging, which is then transferred to a lathe,

where it is turned or ground to the finished s1ze.

In making grooved rolls the grooves may be partially formed by forging, and then fin- Serial No. 226,468. (No specimens.)

ished by cutting orgrinding, or, and preferably, they may be formed entirely by cutting or grinding.

In this method of manufacturing rolls any flaws or blow-holes which may occur in the ingot during casting are closed or filled up by the rolling and forging operations to which the ingot is subjected. In addition to the avoidance or obliteration of flaws and blowholes, as above stated, the rolling and hammering produce such density and compactness 5 5 of metal as to prevent the formation of what is termed surface-cracking-a defect incident to cast rolls. By this method of forming rolls I am enabled to produce a surface which shall be nearly, if not quite, as hard and dense as the surface of a chilled roll, and am enabled to avoid the brittleness and transverseweakness necessarily consequent upon the sudden chilling of cast metal.

Care should always be taken that the ingot, 6 5 whatever its sectional contour, should be of such transverse sectional area as to require considerable working to bring it to approximately the size of the finished roll, in order to closing up of internal flaws and blow-holes.

I claim herein as my invention- 1. As an improvement'in the art of forming rolls for the reduction of metals, the hereindescribed method, which consists in rolling or 7 5 forging an ingot to approximately the sizeand shape of the desired roll, and then cutting or grinding such forged ingot to the desired size and shape, substantially as set forth.

2. As a new article of manufacture, a forged or rolled steel roll for the reduction of metal, substantially as set forth.

In testimony whereof I have hereunto set my hand.

JAMES S. ATKINSON.

Witnesses:

DARWIN S. WOLCOTT,

R. H. WHITTLESEY.

obtain a dense and compact surface and the 7