US3186031A - Rolling mills for producing strip from granular and pulverulent material - Google Patents

Description

June I, 1965 u. GEIER 3,136,031

ROLLING MILLS FOR PRODUCING STRIP FROM 'GRANULAR AND PULVERULENT MATERIAL Filed Dec. 4, 1965 LE /5' Fig.2.

United States Patent 3,186,031 ROLLING MILLS FOR PRODUCING STRIP FROM GRANULAR AND PULVERULENT MATERIAL Ulf Geier, Osterrath-Bovert, Germany, assignor to Schloemann Aktiengesellschait, Dusseldorf, Germany Filed Dec. 4, 1963, Ser. No. 327,950 Claims priority, application Germany, Dec. 24, 1962, Sch 32,518 Claims. (Cl. 18-9) In rolling bands and strips from granular or pulve-ru'lent materials, especially metals, the bands .or strips are liable to exhibit marked edge cracks or fractures, which result during the formation from various causes such as a broadening of the rolled stock, which is uncontrollable with non-profiled rolls, particularly in the marginal zones. This gives rise to the occurrence of a large amount of waste, and an irregular degree or quality of rolling beyond the band breadth.

These disadvantages are obviated by known powderrolling molls, the rolls of which form a closed pass, this being effected by providing one roll with a groove corre sponding to the desired band breadth, whilst the other roll projects into this groove. It is likewise known to provide each roll, at one of its ends, with .a collar, and so to arrange these rolls in relation to one another that each collar bears on the end of the opposite roll, and thereby forms a closed pass. A. modification of this is the use of loose discs, which revolve with the rolls, and which are arranged at the ends of the rolls, and may in some cases be pressed by supporting rollers, and thus take up the spreading pressure. Furthermore, for the lateral limitation of the pass, an appliance is known which consists of a powder-feeding appliance the side walls of which engage in annular grooves in the rolls, and project right into the pass gap.

All these known rolling mills exhibit the defect that any later-a1 roll-gap boundaries that they may have are constant, and therefore the pairs of rolls can only be employed for a single breadth of strip.

The object of the present invention is to provide a rolling mill of the kind mentioned wherein the lateral roll-gap boundary is variable, for the purpose of rendering possible, with a single pair of rolls, a comprehensive rolling programme, Without changing the rolls.

According to the invention, this object is attained by providing each roll with a boundary ring, the radial depth of which corresponds to the thickness of the strip to be produced. One boundary ring located at one end of one roll and the other at the other end of the other roll, and by making the rolls adjustable in the roll stand relatively to one another in the direction of their axes.

In a further development of the invention the boundary rings are in each case loosely connected with the rolls, in such a way that they are axially fixed but are displaceable radially to the roll axes, and that each ring is pressed against the .associated roll body by the action of a force acting towards the roll body. It is thereby rendered possible to vary the roll pass not only in breadth but also in depth, since the lateral boundary is maintained over the entire range of adjustment of the rolls. Even increases in the roll gap, caused for instance by a flaw in a roll, are taken into consideration by effecting the radial displacement of the boundary rings perpendicularly to the roll axis.

The boundary rings may advantageously be pressed against the roll bodies by spring means. In order to keep the frictional wear of the spring means small, these are 3,186,631 Patented June 1, 1965 supported at the ends of the rolls upon sleeves rotatably arranged upon the roll journals. When rolling materials of small thickness, the boundary rings, for the purpose of forming a funnel-shaped and laterally bounded scrap chamber, are prov-ided'with boundary plates partly embracing the rolls. These boundary plates may advantageously be rigidly connected with the boundary rings, which in this case, of course, are not fixed to the rolls, the gap between the boundary plates and the opposite rolls being variable by means of adjusting screws.

One embodiment of the invention is diagrammatically illustrated by way of example in the accompanying drawings, in which:

FIGURE 1 shows a set of rolls with a displaoeably arranged lower roll;

FIGURE 2 shows a set of rolls with boundary rings represented in section;

FIGURE 3 shows a section on the line IIIIII in FIGURE 2; and

FIGURE 4 likewise shows a section on the line III-III in FIGURE 2, but with boundary plates arranged on the boundary rings.

In FIGURE 1 the upper roll, denoted by 1, is supported, by means of chocks 2, in a roll stand, not shown. The chocks 2 of the lower roll 3 are secured upon an axially displaceable slide 4, so that the rolls are adjustable relatively to one another in the roll stand in the direction of the roll axis. Upon the roll journal 1a of the upper roll, and upon the opposite roll journal 3a of the lower roll (FIGURE 2), sleeves 5 are rotatably arranged, upon which there bear spring elements 6. Lateral boundary rings 7, which in FIGURE 1 may be integral with or rigidly secured to the rolls, are in FIGURES 2, 3 and 4 mounted under stress upon the spring elements 6, and axially exactly fixed, between the end faces of the roll bodies and rings 9 fixedly connected with the roll journals. By the spring elements 6 each of the boundary rings 7 is pressed against the roll body of the opposite roll, thus forming with the rolls, a closed pass.

In FIGURE 4, the boundary rings 7 are additionally provided with boundary plates 7a, the distance of which from the opposite roll surface is adjustable by means of an adjusting screw 11, which is provided in an extension 10 of the boundary plate, and which bears against a part 12 of the roll stand.

I claim:

1. For the product-ion'of bands and strips from granular and pulverulent materials, particularly metals, a rolling mill, comprising: rolls forming a roll pass, a boundary ring on one end of one roll and a similar boundary ring on the opposite end of the other roll, the boundary ring on each roll bearing against the body of the other roll, thus closing the roll pass at the ends and thereby limiting the breadth of the band to be rolled, and the rolls being axially adjustable relatively to one another so as to vary the breadth of the band to be rolled.

2. A rolling mill as claimed in claim 1, further comprising: means holding each boundary ring against axial displacement relatively to the roll upon which it is mounted but permitting radial displacement, and resilient means urging each boundary ring radially against the roll body with which it cooperates.

3. A rolling mill as claimed in claim 2, further comprising a sleeve on one roll journal of each roll located within the boundary ring, the said resilient means acting upon each boundary ring being a spring interposed between the sleeve and the boundary ring.

a 3 4 4. A rolling mill as claimed in claim 1, further com- References Cited by the Examiner prising a boundary plate partly embracing the rolls, for UNITED STATES PA N S guiding the material to be rolled into the roll gap.

5. A rolling mill as claimed in claim 4, the boundary 3O17665 1/62 Dasha et a1 18 9 3,019,487 2/62 Naeser 18-9 XR ring not being rotatable wlth the roll but being substan- 5 tially integral with the boundary plate, and the mill fur- FOREIGN PATENTS ther comprising screw means for angularly adjusting the 1,043,457 11/53 France,

position of the boundary ring and thereby adjusting the gap between the boundary plate and the adjacent roll. WILLIAM STEPHENSON, Primary Exalmner-

Claims (1)

1. FOR THE PRODUCTION OF BANDS AND STRIPS FROM GRANULAR AND PULVERULENT MATERIALS, PARTICULARLY METALS, A ROLLING MILL, COMPRISING: ROLLS FORMING A ROLL PASS, A BOUNDARY RING ON ONE END OF THE OTHER ROLL, THE BOUNDARY RING ON THE OPPOSITE END OF THE OTHER ROLL, THE BOUNDARY RING ON EACH ROLL BEARING AGAINST THE BODY OF THE OTHER ROLL, THUS CLOSING THE ROLL PASS AT THE ENDS AND THEREBY LIMITING THE BREADTH OF THE BAND TO BE ROLLED, AND THE ROLLS BEING

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