US654071A - Rolling flanged sections. - Google Patents

Description

No. 654,07l.

T.- MUBRISN.

Patented July I7, |900.

BQLLING FLANGED ASEGTIDNS.

(Application filed May 23, 1900.)

(No Modal.)

QH N: f2 93h ni I "4 e a) Si WITNESSES ooo 2 Sheets- Sheet l,

LEGO* Tus Ncnms PETERS w.. PHomLlTN'n., wAsNxNuTUN. mc.

No. 654,07I.

Patented IuIy I7, |900.

T. MORRISON. ROLLING FLANGED SECTIONS.

(Application led May 23, 1900.)

(No Model.)

2 Sheets-Sheet 2 9M www Hora-nwo.. wAsHmaToN o c THOMAS MORRISON, OF BRADDOOK, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGNMENTS, TO JULIAN KENNEDY, OF PITTSBURG, PENNSYLVANIA.

ROLLlNc FLANGED SECTIONS.

SPECIFICATION forming part of Letters Patent No. 654,071, dated `J'uly 17, 1900.

Application filed May 23, 1900. Serial No. 17,679. (No model.)

To @ZZ whom t may concern:

Be it known that I, THOMAS MORRISON, of Braddock, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Rolling `Flanged Sections, of which the following is a full, clear, and exact description.

My invention relates to an improvement in rolling iron or steel articles-such as railroadro rails,beams,girders,or other structural shapes which are long and comparatively narrow and of unequal thickness at different points of the cross-section--the purpose being to increase the density and hardness of the article. In describing my improvement I shall refer particularly to its application in the manufacture of railroad-rails, premising that it is applicable to steel or iron beams or rails of unequal thickness at different points of their 2o cross-section, and while I have invented and herein describe a special mechanism for the purpose it may be modified according to the article to be rolled, or other mechanism producing the same result in substantially the 2 5 same way may be employed.

In rolling steel rails in the manner heretofore practiced the ingot or bloom having been heated to the required temperature is then passed a number of times between the 3o grooves of the rolls, technically called passes, and is thus fashioned into the desired shape, the Operation being rendered continuous by shifting the rail from one pass to another and rapidly feeding fresh 3 5 ingots or blooms to the rolls.

I have found that the temperature at which steel is worked, and particularly in the iinishing pass, has an important influence on the quality of the nished product. The steel 4o reaches the rolling-mill as an ingot, which having been heated in a suitable heatingfurnace is then passed through a bloomingmilland convertedintoblooms. Theseblooms are in turn heated in a suitable furnace and then delivered to the rail-mill, where they are rolled into rails. As steel has to be supplied to nills in large masses, in ingots weighing as i'nuch as two tons or over, and as these ingots when worked into rails give several 5o rail lengths, which by the ordinary practice cannot be iinished simultaneously, it follows that every rail cannot be finished at the same temperature. Therefore an objectionable irregularity Occurs among the dierent rails, and this is shown in the variable density of the finished steel and is readily determined by microphotography.

For facility in working it is necessary that the ingots or blooms enter the rolls at a white heat, or thereabout, but for the best results 6o in finishing the piece of metal ought to leave Jthe finishing-rolls at a much lower temperature, so that it is desirable that the heat be materially reduced between the intermediate and iinal rolls, to such an extent, if desired, as to amount. very nearly to cold-rolling; but to effect this cooling in the ordinary method of rolling there would be such a delay between the passage of each rail through the iinishingrolls and the passage of the next rail in suc- 7o cession as to result in a very material loss of time.

The object of my invention is to improve the quality of rolled pieces of metal by regulating the temperature at which they are iinished and to cause each of the rails to be passed through the inishing-rolls at ya reduced temperature by allowing it to cool without interfering with the continuity or rapidity of action of the nishing-rolls. I 8o accomplish this by introducing an interval in the time of passage from the intermediate to the finishing rolls, during which every individual piece can be brought to the same temperature, that temperature being of the degree which has been found to produce the best results. This is done without interfering with the rapidity and continuity of action of the mill, and it results in improving greatly the product of the mill. This intro- 9o duction of an interval in the rolling may be accomplished in a variety of ways, and it is not dependent on any special mechanism. I have, however, invented a system of apparatus that will permit of this interval without any delay or interference in the continuous operation of the mill, and I will now proceed to describe my invention in connection with this apparatus.

In the accompanying drawings, Figure 1 is roo a plan view of the rolls, the feed-tables, cooling-table, and finishing-rolls; and Fig. 2 is a vertical cross-sectional View showin g the feeding mechanism which draws the rails from the feed-rollers to the cooling-table and from the cooling-table to other feed-rollers which lead to the nishing-rolls. Fig. 3 is a vertical section on the line III III of Fig. 1. 4 is a vertical section on the line IV IV of Fig. 1, and Fig. 5 is a side view of the rolls.

Like symbols of reference indicate like parts wherever they occur.

In the drawings, 2 represents the threehigh roughing-rolls of a rail-mill.

are provided with a feed-table 3, which'is preferably vertically movable and may be of the ordinary construction and arrangement. The metalpasses back and forth upon the table 3 until it reaches the last pass of the rolls 2, and from such lastpass it is delivered to a separate .table 5, having rollers 4. This table 5 is provided with a series of stationary cross-bars or supports 6, constituting a cooling-table open above and below, extending, preferably, on an upward incline to and slightly above a second series of feed-rollers 7, which are parallel with the rollers 4 and lead. to the finishing-rolls S. Between the rollers 4 are fingers 9, preferably mounted on antifriction-wheels 10, which run on the ways 11, as shown in Fig. 2. These ngers are bolted to rods 12, whose outer ends are pivoted to levers 13, keyed to the shaft 14, which is operated by the motor 15 at any desired interval of time, such interval being the time requisite to cool each rail to the desired degree, as the skilled operator may iind most eicient.

y The operation is as follows: The heated metal is fed to the iirst pass of the roughingrolls 2 and passes upon the table 3, from which it is fed back through the second pass of the rolls 2, then back to the table 3, and again through the rolls in the usual manner and as often as may be necessary to reduce the metal tothe desired shape. 0n the last pass the rail` is delivered to the feed-rollers 4, by which it is brought into the path of the fingers 9. These fingers are then actuated by the motor and their connecting-rods 12 13 and are caused to draw the rail from the rollers 4 to and upon the cross-bars 6 of the cooling-table 5,. The rail is allowed to rest in this position, and the fingers 9 are then moved back to their original position. When the second rail comes from` the last pass of the rolls 2 to the rollers 4, the movement of the fingers 9 is repeated, drawing` the second rail upon the table 5 beside the first rail and pushing the first rail laterally farther on the table. In the drawings the table is shown of a width suitable for supporting iive rails of the ordinary thickness; but it may be adapted to receive a greater number, if desired. After the five Fig. i

rlhese rolls may be of the ordinary construction and y rails, more or less, have been placed on the through which the rail is given a single pass.

By adjusting the distauceof motion of the fingers 9 to the width of one, two, or more ,rails by any suitable means of adjustment the period during which the rails remain on the table 5 and the interval of time introduced between the last pass of the roughing-rolls and the first pass of the nishing-rolls may be regulated as desired without affecting the continuity or rapidity of the rolling operation and the output of the mill. Each rail may therefore be allowed to remain on the table 5 during a period required to roll five, four, three, or a greater or less number of rails, during which time it is cooled throughout al1 its parts. When the outermost rail-bar has been pushed laterally until it drops from the. table upon the feed-rollers 7, and has been carried by them beyond the end of the table, another rail is in like manner pushed upon the feedrollers, and so on continuously, the interval being regulated by the throw of the fingers and the number of rails lying side by side on the cooling-table.

. The finishing pass is proportioned so that the work is mainly performed on the head of the rail, and only suiicient work is done on the flange to prevent the rail from twisting. Preferably from six to eight per cent. of the total reduction of the sectional area per' formed on the head and web of the rail is done in this iinal pass, and, as just stated, a much less reduction is exerted in this pass upon the iianges. I do not desire to limit my invention to the cooling of the lnetal for any particular period or interval, as larger masses may require a greater interval, and different intervals may be required for dilerent purposes. I have found the best results from an interval between the roughing-rolls and the finishing-rolls of about seventy seconds for a rail of seventy-five pounds per yard.

What I claim as my invention in the rolling of bars, rails, or other articles of iron or steel having considerable length and comparatively small cross-sectional area is 1. The method of rolling elongated shapes of metal having head and flange portions, which consists in passing the same through initial shaping-rolls, allowing a regulated interval of time to elapse during which all parts of the metal become reduced in temperature, and then giving the metal a working pass at such reduced temperature through inishingrolls and imparting therein a greater reduction to the head than to the flange; substantially as described.

2. The method of rolling elongated shapes of metal having head and flange portions,

`which consists in passing a number of such without impairin g the continuity of operation shapes of metal consecutively through initial of the latter; substantially as described. 1c

shaping-rolls, placing them side by side on a cooling-table, allowing them to remain cooling a uniform regulated interval of time, during which all parts of the metal become reduced in temperature, and then passing them consecutively through the finishing-rolls In testimony whereof l have hereunto set my hand.

THOMAS MORRISON. Vitnesses:

G. E. F. GRAY, J. E. MITCHELL.

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