US988868A - Rolling-mill for rolling out hollow blocks. - Google Patents

Description

A. PASSL.

ROLLING MILL FOB. ROLLING OUT HOLLOW BLOUKSL APPLICATION FILED APR. 10, 1000.

2 SHEETS-SHEET 1.

Patented 1 11.4, 1911. v

4 A. PASSL. VBOLLING MILL FOR BOLLINGOUT nomzow BLOCKS.

APPLIOATION FILED APR. 10, 190B.

Patented Apr. 4,-1911.

z sums-sum 2.

ql xtorsrassr', orw'nsma;

Fnssn, engineer,

the following rollers arranged transverselyv behind each other and rotating at increasing speeds,

v wherein the core-bar in the first method is moved forward by. the fastest rotating pair ,of rollers provided with grooves forming av round ass, and in the second method is 3 'moved orward by the slowest pair of rollers likewise provided withround grooves; The first met odnecessitates'a very long coref bar as the speed of the core-bar and-work is equal.- In the second method the arrange 'ment of. the round grooved rollersat the efi'ecton uniform rolling and'even makes it entrance to the rolling mill'oflers a great disadvantage which greatly diminishes the other advantages. Interruptions in the flow of the metal from one grooved roller to the other are caused by the core-bar moving forward-too slowly,"'this having an adverse uite. impossible; These drawbacks assert t emselves more particularly when. soft metal is being rolled. It is therefore desirable'that the core-bar should advance more rapidly than the groove of the first pair of rs and that e grooves in ,said rollers should be of oval shape in order to be able to stretch more readily. The advantage of a short. core-bar should however be retained in order that the rolled pipe is always longer than the core-bar'during the rolling. T In order to attain these advantages, a pair of rollers which are driven at a given speed are each provided wlth a semi-circular groove whereby a trueround pass is formed between them. 'The rollers on each side of these intermediate rollers are provided with semi-oval grooves" wherebyan oval pass is formed between eizch pair of rollers. The

rollers which are the speed of the receiving rollers, or the rollers in front of theintermediate rollers being less than, the'speed of the intermediate rollers, while that of the delivering'rollers or. the rollers inthe rear of the intermediate rollers is greater-.- The grooves in the sucrovided with the semioval grooves, are, rlven at variable speeds,

flon o! Letters Patent. 5 a imation illeclApril 10, 1908. 'Serial No. 426,846.,

aonnrnmmnron nonnnm our HOLLOW nnocxs.

' Patented Apr. 4, 1911.

cessive pairs of rollers on each side of the intermediate pair of rollers are increased as to their greatest diameter, whereby each. successive pair of rollers, will resent a smaller surface which will come in contact with the material being worked. The proportionate broadening of the oval pass rollers, should, as far as possible, counteract the drawing or retardingact-ion of the corebar and thereb) prevent tearing or shortening of the work from one grooved roller to the other.-

In the accompanying drawings, Figure 1 is a top plan view of my invention, Fig. 2 is 4 a side elevation of t-he'same, Fig. 3-is a bottom plan view; Fig. 4 is a detail side eleva tion of one pair of the rollers having an oval passtherebetween, Fig. 5 is a detail side elevation of the intermediate pair of rollers, having'a true round pass therebetween, Fig. 6 is a detail sectional view'of the series of pairs of rollers with a section of the metal tubing to be rolled and the core bar or'mandrel in applied position, and Fi 7 illustrates the successive actions of the di ferent pairs of rollers on the metal tubing.

In Figs. 1, 2, 3, 4 and 5, the ap roximate application of such a rolling-mil is repre-.

- sented. In Fig. 1-. it can be seen, that all the rollers receive an increased speed of rotation by the cogs a, b, c, d, e. f, g, as they have a decreasing diameter beginning from a.

These cog-wheels are fixed up in the co wheel standards 1' and are-connected wit the rollers e by coupling and alsoby the bevel-wheel's'lm n. The rollers, o enga e mutually by means of the cog-wheels i and a in order to receive 'the right direction of rotation. The pair of rollers 0 on which the passes are introduced, are marked .by l.- The arrangement of the horizontal rollers is es, pecially to be seen in Fig. 4, the arrangement of the vertical rollers being shown in Fig. 5. Fig. 3 shows the horizontal rollers in section} Fig. 6 represents the schematic arrangement of thepairs of rollers, the material W in the action of being rolled is shown in section, the said material W, as well as the mandrel Q, moves forward in the direction of arrows.

In Fi 0 having oval forms. These oval passes press the material to be rolled only on a 7, the corresponding passes are" shown, t e same, with the exception of pass small part ofthe surface, of the mandrel, while the round pass encireles the mandrel closely on all sides. By thisclose encircling on all sides, the mandrel Q is held so firmly that it can move forward only at the speed.

of this round pass. This speed is always [greater-than that-of the preceding first pair of rolls, and less than'that of the following last 'pair of rolls and is the best taken from the middle pair of. rolls. The intermediate pair of rollers, as has been stated heretofore, are provided with semi-circular grooves, wlnch form a true round pass between the said rollers. Therollel's' on each side of the intermediate rollers are provided with semi-oval grooves, whereby oval passes are formed .between each. of these pairs of rollers. vThe grooves in the successive rollers eon each side of the intermediate-pair of rollers'are' increased as to their greatest diameter. Thus,the pass of the first rollers and'the pass of the last rollers are the most oval, the same being able to exercise the least effect on the speed of the mandrel, so that uous mill from an apertured blank over a mandrel capable of movement inv the direction'of rolling as the same progresses, whlch consists in subjecting the blank when assembled on the mandrel to a rolling action in vsaid null, and lncreaslng the contaetlng area of the successive passes from the pair of rolls atthe entering end ofthe mill, to the central pair of rolls and then decreasing the contacting area of the successive passes to- Ward the final pair of rolls, whereby the speed of the mandrel is. controlled by the speed of the center set of rolls.

'ALOY S 'FASSL;

. In presence of-- CARL STUPP, LOUIS Vannonn.

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