US1744017A - Rolling metal strip - Google Patents

Description

Jan. 14 192.0.

A. P. STECKEL 1,744,017

ROLLING METAL STRIP Filed Se t. 15, 1923 INVENTOR application also describes and claims theim- Myf co ending application,

Patented Jan. 14, 1930 UNITED STATES PATENT OFFICE ABRAM 1. STECKEL, OF YOUNGSTOWN, OHIO, ASSIGNOR TO THE COLD METAL PROCESS COMPANY, OF YOUNGSTOWN, OHIO, A CORPORATION OF OHIO ROLLING METAL szrmr Application filed September 13, 1928. Serial No. 662,426.

1 The present invention relates to rolling metal strip, and more particularly to cold rolling iron or steel strip so as to preserve- ,the edge of the strip.

Serial No. 648,761, led June 30, 1923, describes and broadly claims the process of rolling by pulling a strip of metal past a-relatively small reducing roll having an anti-friction back- I in roll, alarge part of the power being supplled by tension on the delivered strip. Such proved product thereby obtained. 1 In the present practice of cold rolling strlpf .15 there is serious trouble with the cracking o the edges of the material. The use of round ed edge strip for cold rolling lessens the trouble somewhat, but the trouble is still serious even with rounded edge strip. The

ordinary cold rolling mill employs rolls of metal at the edge of the stripl to flow laterrelatively large diameter, usually from six totwenty-four inches in diameter. The enormous .pressure required for rolling with these large diameter rolls apparently causes the ally and develop cracks in strip. I have discovered that strip may be cold e edge of the rolled and a smooth and finished edge re- 0 tained, even with large reductions in thickently give the necessary using rolls of two tially round 7 round edge strip to cold rolling with sufliness, by employing a strip having an ini ge, and by subjecting such ciently small rolls. The small rolls apparreduction in thickness by elongatin the metal lengthwise and without the sidewlse extrusion or flow caused at the edge ofthe strip incident to the use of relatively large rolls. For example, by

ameter, I have reduced a medium carbon steel strip from a thickness of one-eighth to four-.thousandths of an anclfrlabout one; .twenty-fifthiof the original tliic ess) with-' out-intermediate annealing, and reservingthe ed e of the strip'withouticrac g.

In t e drawings, which illustrate conventionally my rolling mill and the reduction in the'stri thickness:

Figure is an elevation showing diagram- I stands and one-half inches in di-f Figure 3 is'a cross sect1on illustrating the strip before rolling, and

Figure 4 is a similarsection illustrating the strip after-partial or complete reduction.

In the drawings Figure 1 illustrates diagrammatically a. rolling mill for carrying out my process. A strip 1 is passed between rolls 2 and 3 of relatively small diameter, few. inches in diameter). The rolls 2 and 3 are of necessity too small to withstand the rolling pressure when a strip of several inches in width is to be rolled, and are,tl1erefore, backed up by larger backing rolls land 5 which are strong enough to withstand the rolling pressures.

In Figure 2 is illustrated a modification, in which the strip 1 is rolled between a single small roll 3 and a large roll 4", the small roll 3 being backed up by a large roll 5. While it is preferred to use two small rolls,

as shown in Figure 1, since a'greater angle of divergence of the rolls can be obtained, it is possible to use 'a single small roll as shown in Figure 2, since a relatively large angle of divergence can be obtained between it and the opposing. roll.

The rolls can beused in any convenient form of roll support. In my copending application Serial No. 648,761 filed June 30, 1923, I ha'v'e illustrated in more detail roll for carrying small rolls for cold rolling, such as here employed. For rollingl the strip according to the present invention, owever, it is not necessary that therollsbe prol'vided with an anti friction mounting to perniit the strip to be drawn through as described in detail in my copending application above'referredto. The round edge will be preserved on the strip, even though the rolls e power'driven and mounted in the usual .,relatively lar e friction brasses.

The strip 1 is hot rolled to the form shown in Figure 3, its edges being rounded as'indicated at 6. The strip is then passed through the rolling mill, where it is subjected to reng roll until ;ure 4, although the strip may be .reduced as much as to one-twenty-fifth of its original thickness by cold rolling.

I prefer to use rolls of a'few inches in diameter (2 to 3 inches); However, the roll diameter may vary somewhat depending on the character of the rolling and of the material being rolled. In all cases I prefer to keep the roll diameter sufficiently small so .asnot to cause cracking of the strip edge and,

. where all the advantages of the invention tion of the in many cases also results in a saving of ma-- are to be realized, sufliciently vent widening of the material.

A great advantage of usin small to preciently small as to eliminate wi ening is that v '20 the metal stock which is to be rolled may be made of the exact desired width before rolling, either by a previous rollin operation or by trimming. This greatly re uces the work of trimming, since the stock is only a fraclength of the finished product, and

terial. 'Another advantage which results 0m trimming of the stoc rather than the final product is that the stock is of uniform width when it is fed to the mill, thus making possible accurate side guiding andresulting in a perfectly straight finished product.

he present invention is not limited to the details above described, but may be otherwise embodied within the scope of the following V which claims.

I claim: K

1 The process of cold rolling metal strip wh ch consists in assing cold round edged strip through a ro ling mill having at least one roll of but a few inches in diameter whereby the edge of the strip is kept from cracking. '4 The process of cold rolling metal strip wh ch consists in passing cold round-edged strip through a rolling mill having one roll whose diameter is not more than about two and one-half inches whereby cracking of the strip edge is eliminated.

v e process of cold rolling metal stri wh ch consists in passing cold round-edged strip between rolls whose diameter is not more than about two and one-half inches whereby cracking of the strip nated. 1

which consists in passing cold a plural1ty of passes without any intermediate annealing, each pass having at least one roll of a diameter not more than two and strip throug one-half inches whereby cracking of the strip edge'is eliminated. I

5. The process of cold rolling metal-stri consists 1n passing cold strip through a plurality of which includes cold edge is elimi-' 4. The process of ccldrolling meal strip passes without any i'ntermeand one-half inches whereby cracking of the strip edge is eliminated.

6. The process of making metal strip, which includes hot rolling metal to form a strip having rounded edges and cold rolling such strip in a plurality of passes with the rounded edges disposed sidewise of the metal as it is cold rolled, at least one roll in each of the cold rolling passes being of such that intermediate annealing of the strap 1s eliminated.

7. The process of making metal str1p rollin a strip having rounded edges, which roun ed edges are disposed sidewise of the metal as it is cold rolled, and-reducing the metal by vthe cold rolling to at least 1/25 of its origlnal thickness, at least one roll in each of the cold rolling passes being sufiiciently small to eliminate annealing of the strip during the. cold rolling.

8. The process of making metal strip which includes subjectin the metal to cold rolling in a-plurality of passes embodying small supported rolls, metal to materially less than half its original thickness, the rolls being of sufficiently small passes embodying whichincludes subjecting the metal to cold' a plurahty of passes, embodying rolling in and subjecting the small supported rolls,

metal to tension during the rolling operation,

less

thus reducing the metal to materially than half its. original thickness, the rolls being of sufiiciently small diameter to substantiall eliminate widening of the material while rofi ed under such tension. In testimony my hand.

ABRAM P. STECKEL.

and thus reducing the making metal strip the metal to cold whereof I have hereunto set and thus reducing the Y DISCLAIM ER 1,744,017.-Abram P. Steckel, Youngsfitiwn, Ohio. ROLLING METAL STRIP. Patent dated J anuery 14, 1930. Disclaimer filed September 1,1939, by the assignee, The Gold Metal Process Company.

Hereb enters this disclaimer to claims 6, 7, 8, 9, and 10 in said specification.

[ jfic'ial Gazette September 26, 1939.]

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