SU112316A1 - Cold rolling mill - Google Patents

Description

In the known cold rolling mills of metal sheets and tapes, working stands with back-up rolls are used. In these cells, to reduce the thickness variation across the width of the rolled sheets, the rigidity of the roll barrel is increased by resting the work rolls on support rolls of a larger diameter, which take the main forces.

Such a design of the working stand has the disadvantages that the support rolls and their bearings significantly increase the dimensions and weight of the frame, complicate the design of the stand and the handling of rolls. In addition, despite the increase in weight of the cage due to the installation of back-up rolls, they do not provide the allowable thickness variation of the rolled sheets. The work rolls are continuously abraded with rolled metal, which violates the desired roll profile and necessitates their repolishing. The change of rolls requires considerable time, which reduces the productivity of the mill.

In the proposed cold rolling mill without support rolls, these drawbacks are eliminated by the fact that in the working stand of the cold rolling mill, instead of the support rolls, fixed support beams are used, and the barrels of work rolls abut along their entire length in liners mounted on rigid beams that transmit rolling force to the working rolls. bed frame. The roller journals serve only to transfer torque. Such an embodiment of the working stand provides a significant simplification of the mill design, reduction of weight, size of the bed, simplification of roll handling, a significant reduction in the cost of manufacture of the mill and an increase in its performance.

The design of the working stand of the cold rolling mill is shown in FIG. 1 and 2 in two projections.

Inside the frame 3 of the closed type there are two support beams 2, of which the bottom one is stationary and the top one is balanced with the help of a hydraulic cylinder / fixed in the upper part of the frame.

No. (i2 -

In the cptunpH part of the support legs. 1, grooves are provided in which the cassettes 4 are fixed, designed to accommodate work rolls in them with 5 n liners 6.

The liners can be used from conventional anti-friction materials. Plastic pads made of plastic materials: nylon, teflon, tufnol 11 others. The axial forces of the roll are adopted by semi-rings 7 with inserts.

Repolishing; work rolls, associated with the restoration of the tref) yeMc) ii surface cleanliness of the barrel, up to certain limits can

pierce without changing liners. With a significant change diNKipa. the chock of the v. the staffs are unrelieved according to the new

size of the roll.

Transferring the supports of the work rolls from the necks to the barrel creates more favorable conditions for the liner operation, since this significantly reduces the specific pressure and increases the sliding speed.

The heat that develops from the rub of the liner is removed by the water, which also serves as a lubricant. In cases where, for technological reasons, this is unacceptable, water may be replaced by an emulsion or an oil. In order for the emulsion not to be diluted with cooling water, a scraper is pressed against the work roll, in which water from the insert (textolite) flows along the roll to its end, where it is drained to the side of the emulsion collector.

Subject invention

A cold rolling mill with work rolls, characterized in that, in order to simplify the construction of the mill, the work roll barrels all its length rest on the liners of antifriction materials fixed on rigid beams that transmit the rolling force to the work stand.