Патент USA US2133051код для вставки
2,133,051 Patented oct. 11, -193e UNITED Y STATES PATENT OFFICE 2,133,051 METAL ROLLING MILL _ Claude A. Bollinger,` Gary, Ind. `Application March 24, 1937, Serial No. 132,823 i claim. (ci. zio-31.1) This invention relates particularly to the join ing of metal .strips in vsuperimposed relationship by passing them through a set of pressure rolls while providing suflicient heat to eiïect interweld 5 ing, but the broad principles of the invention are applicable to many metal rolling problems. The primary object is to prevent slipping of the strips either relative one another or relative the ` l0 rolling surfaces necessarily involved. - Another object of practically equal importance is to roll the strips together so that they are re spectively brought into' complete contact with each other.’ Still other objects may be inferred from the l5 following~ disclosure. In the accompanying drawing: Figure 1 is a sectional elevation of a mill em bodying the principles of- the present invention. Figure 2 is apartially sectioned view showing 20 the roll elements of this mill. The mill includes a housing I which mounts~ two parallel rotary mandrels 2 having journals -the pass of the rolls 4'and in a plane with the same, from a furnace 6 (of which only the vend is shown), then over a deilector roll 1 and so to a tension reel 8. Suitable means for driving this reel 8 so as to apply proper tension are l known to those skilled in the art. The outside metal strips are fed from coil boxes 9 which are oil‘set relative the pass line of the rolls 4, through friction blocks Ill and from there _ tangentially onto the surfaces of the rolls 4, the 10 strips wrapping around these rolls throughv 180 degree arcs and eventually passing between them so as to be brought into contact with the mid dle strip. It now becomes obvious that the ten sion reel handles all three strips, the heat from 15 the iron strip being sufficient to effect the weld ing. ‘ According to the prior art, when the general operation under discussion is to be carried out, the strips to be joined are passed between solid 20 rolling rolls very similar to, if not the same, as metal rolling rolls. Furthermore, all the strips -to be joined are fed through the rolling pass in rather similar to metal rolling rolls, the jour- - at least approximately the same plane, this plane coinciding with the pass line of the rolls used. 25 2,», nals 2a being adapted to turnin suitable bear 2a and fiuted ends `2b. These mandrels 2 are ~ ings with those of the upper mandrel engaged The above procedure is beset with two big dif- ‘ by suitable holddowns 3, and the iluted ends 2b ficulties, one of these being a decided tendency being adapted for connection> with powered- of the strips to slip, relative the working rolls - spindles. 30 However, these mandrels 2 differ from ordi nary rolling rolls in that they have circumferen tially grooved surfaces, these grooves being marked 2c in the drawing, and in that they work through a set of hollow rolls 4 which encircle the 35 mandrels', these rolls being internally _grooved to provide grooves 4*L which ñt the grooves 2c of the mandrels._ The rolls 4 have inside diam eters which are larger than the outside diameters of the mandrels 2, whereby the rolls 4 rotate 40 eccentrically respecting the mandrels 2 when they are pressed together by the operation of the‘hold downs 3. The diameters of the respective parts and one another, while the other is the inability of the rolls to bring the strips into perfectly 30 flat, complete contact with each other when they are fed in the same' common plane straight through the roll pass. It requires little imagina tion to realize'that both of these difliculties pref -sent serious obstacles in the .way of obtaining a 35 product wherein the various >strips’are integral ly united in such a manner as to permit sub sequent processing, such as cold rolling and the . like, or their fabrication into ultimate products. this often involving drawing and forging effects. 40 Such difficulties are largely obviated by the in vention under discussion. The rolls 4 rotating eccentrically respecting the powered mandrels-2 should be related so that the rolls 4 may be slid freely over the mandrels 2 when this is neces provide endless rolling surfaces that'are under 45` sary, it being obvious that the inside diameter of the rolls must be sufficiently large topermit motion as the strips, the latter therefore being clearance between the various grooves. ^ In the embodiment of the invention under dis cussion, three strips are being welded together. 50 The inside one of these strips may be commer' cially pure iron, while the outside strips may be' copper, nickel or an alloy, or any of the 4other metals commercially used in the production of multiple-layer strip. 55 ’ Guides 5 lead the iron _strip straight through the same rolling pressure and Have much the same 45 imparted the same linear speed as the peripheral i speed of the rolls. Interposed friction-reducing films, such as are generally encountered in prac- 50 tice, are relatively immaterial.l The rolls 4 pro vide endless successions of continuously over lapping, progressively curved surfaces, as con trasted to the rolling surfaces of ordinary rolls. The contrast may be to some extent compared 55 2 , _ with that existing' 'between a vtractor driven by an endless chain and che driven by wheels. mrthermore, due t6? the strips being 1ed tanï. gentially ontc;E the roll* surfacesby means offset fromrthe pass line of the rolls, the strips Imust wrap at least partially around the roll surfaces prior to their being 4pressed into contact with the center strip. This, in conjunction with the fea ture of the eccentrically driven rollsff4, assures not only that no slipping will @our butL also, that the outside strips Willi'have conformed exactly to the cylindrical surfaces of the rolls prior to their being pressedîonto the center or iron strip. This wrapping feature also provides time for the outer moststrips tóY absorb a large amount of the hèÍ-.at from; the rolls- 4, it being remembered that the centéî‘ strip is heated and that heatL from strip .is being constantly absorbed by ¿the rolls 4. Although the principles ofîthe invention have 20 be'en disclosed by means of a 'specific example'in '- accordance with the :patent statutes, itis not in iW H HM tended that its scope be thereby limited exactly to this example, except to the extent deñned by thegîappende'd claim. ¿ IÉclaim: ‘ Ã mill characterized by a set of holiow rolls and 5 mandrels passed through said rolls and provided with holddowns for applyinglpressure to said rolls, the inside diameters of the latter being materially ' greater than the outside diameters of said man drels, said mill being adapted to join strips in superimposed relation and »',including means for feeding one strip, means for heating said strip and means offset from the pass line of said inan dré?ls for feeding at least onel-o'therrstrip tangen tially into contact with one of said?îrolls so that it Wraps therearound to a suflicientìextent to ab stract substantial amounts '-,òf heat from said roll imparted thereto by the ñrst named strip, prior t0 passing through said rolls with the first named strip. . i _ ~ ' VTCLAUDE A. BOLLINGER.