US1428142A - Roll for rolling mills - Google Patents

Description

F. M. CANDA.

ROLL FUR ROLLING MILLS.

PLlcATmN FILED Dac. n. :92o

PtentedSept. 5, 1922.

, differ/yay Patented Sept. 5, 1922.

' cmu* FERDINAND MORA CANDA, or NRW YORK, N. Y. n

y ROLL FOR RoLLINGjr/rrLLs,

Application yfiled December 17, I17929. Serial` No; .i

ed 'for use Iin ball rolling machines, inay'also serve other purposes.

In the operation of ',rqllinggmills 1t 1s im,-

portant to maintain Vthe peatinfglvfaces or` surfaces of the rolls accurateand true and the necessity for frequentg-trueingx of the rolls' adds considerablyy to the expense of maintenance. In the type of rolls having ridges to shape the material, wear of these Accord` ridges is particularly undesirable. ingly, I construct those portions ofthe roll, which are mainly subject to wear, of very hard steel. It frequently happens that one or more of the ridges become worn 'or de'- fective while the remainder of the roll is perfect. I have, therefore, devised a roll in which each ridge portion is separately formed and may be removed or replaced and by so doing the life of the roll is very greatly lengthened. Moreover this change of parts can be effected yquickly so that the loss of time heretofore necessitated by trueing of the rolls is greatly reduced and the expense of replacing a worn or partially defective roll with an entire new one is obviated.

The object of my invention, therefore, isv

to reduce the wear of rigid rolls and thus to prolong their life, and to provide for the ready replacement of only those portions of the roll` which become worn or defective.

In the accompanying drawings, Figure 1 is a longitudinal sectional view of ya mill roll embodying my invention, the section being taken on the line 1-1 of Fig. 3; Fig. 2 isa longitudinal sectional View on the line 2 2 of Fig. 4t, showing another form of my invention; Figs. 3 and 4c are transverse sectional views on the lines 3-3 of Fig. 1 and 1:4 of Fig. 2, respectively.

I construct the roll of a series of rings i or disks which are bolted together and secured in any suitable manner upon the roll shaft. In the form shown in Fig. 1 the sharp ridges of the roll are formed on the peripheries of narrow disks 5' of a very gradewofssteel, toolsteeland which may be'oneof the steels known inthe tradey 1 as fhigh f speed tool lsteelQ. The troughs of the grooves `are vformed upon wider disks-6 interposed between Ithe disks 5 andformedcf atougherwmetal, preferably unliardened A'forged,'steel. All of the disks` are 'provided with perforations Lto receive thevbolt's I 8. after they have been-'assembled on/thefshaft whichy is of mildsteel andto what they are ticked by @key 12; y

Underisome conditions `I found that mayffdispense, withtheforged'steel vdisks 6 f and form thejrollsfentirely yfrom disks of disk with oppositely disposed",curves symmetrically arranged to form central. ridges, each groove being formed' by *the4 curves of adjacent disks. I have illustrated this u specially,hardgrade.steel, constructingthe construction in Fig. 2 wherein the entire roll is formed of a very hard grade ofsteel disks 5a, each disk being the width of one of the grooves. The disks are assembled on the shaft and bolted together in they manner described in connection with the form shown in Fig. 1.

I have illustrated rolls which are suitable for use in ball rolling mills such as shown in my applications for Letters Patent, Ser. No. 329,774, iiled Oct. 10, 1919, Ser. No. 332,284, filed Oct. 2l, 1919, and Ser. No. 334,030, filedO'ct. 28, 1919. It will be evident that'my method of constructing rolls may be applied to other types, as for instance, such rolls having V-shaped grooves which arevused for rolling angle bars, particularly `the yso-called square root7 angle bar.

As previously stated, the rolls are especially intended to be used in machines' for forming steel or other iron balls adapted for use in Crusher mills and the like. The blanks supplied to the machine are usually in the form' of rods, these blanks being preferably heated to a suitable forging or rolling temperature before they pass through the machine. Then the bar is pressed against the rolls, the sharp projecting ribs or ridges cutinto the bar forming grooves which-divide it into sections, each corre-k sponding to one of the grooves of the rolls.r

As the operation proceeds, the ribs cut more deeplyV into the `bar and the metal atthe shoulders of they sections into which the said bar is divided is pressed inward toward the equatorial portions `of the forming balls. It is evident that the greatest strain and wear in this operation falls upon the outer peripheral ribs or ridges of the rolls .which are required to continually cut or groove the blank bar. I have found that these ribs Will maintain their integrity and accurate shape for a considerable length of time if they are formed of a very hard steel such as the high speed alloy steels and provided they are lso disposed that the strains will be symmetrical and uniformly distributed at the base of the ribs in the supporting metal. I accomplished this, purpose by forming the ribs symmetrically upon a central plane of the disk. When the .disks have been rigidly bolted together upon the shaft they mutually brace 'each other against lateral thrusts, and forni, in effect, VasolidV roll. At the same time any disk which becomes defective from Wear, chipping yor breakage may be readily removed and replaced With a new disk, therey by greatly prolonging the normal glife of the lentire roll, very materially reducing the expense `of maintenance as Well as sav' which merge into the curved faces of ad Y jacent disks of tougher metal.

2. rolling mill roll, comprising a grooved roll body formed of juxtaposed symmetrically shaped disks, certain of said disks being composed of a hard grade of steel and provided with centrally disposed peripheral ribs whose opposite sides conform to the curvature of the grooves ofthe roll body, each groove lextending over a plu-` r'ality of disks.

In testimony whereof, I have signed m name to this specification, this y16th- 'day of December, 1920.

` FERDINAND MORA CANDA.

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