DE2547490A1 - Rolling mill with hydraulic prevention of roll flexure - using row of hydraulic cylinders to support each work roll - Google Patents

Abstract

The work rolls are prevented from flexure by hydraulic pressure. In one pref. rolling mill, the work rolls are mounted in stands fitted with traverses, each traverse contg. a row of hydraulic cylinders with pistons pressing on balls or small rollers. The balls or rollers are pressed against the roll barrel over the entire length of the roll and thus prevent its flexure. Alternatively, the work rolls are supported by back-up rolls, and the hydraulic pressure is applied along the back-up rolls. The dia. of the work rolls can be reduced, because the hydraulic pressure prevents bending or flexure of the rolls.

Description

Rolling mill and similar iSimaschinen with bend-free

Rollers The tialzgut is when passing through the roll barrel on the required strength or shape. The forces that occur are in the conventional rolling mill via the double-sided seam journals onto the seaming laser transferred while the roll barrel is deflected. About the wetness of the sag To keep it low, the work rolls in the duo rolling mill are made very strong, while in the four-high rolling mill, additional backup rolls reduce the deflection keeps it low. In order to counteract the deflection that still occurs, the Bales of the back-up rollers ground spherically by the amount of the Durohbiegung. The rolling mill becomes gigantic and expensive, which affects all facilities that related to him.

According to the invention, the rolling pressure acting on the roll barrel an equal force opposite. The bending forces are canceled and not longer available, the roll necks and their bearings are no longer loaded.

Because there are no more forces to deform the rollers, the dimensions of the rolling mill become smaller, which has a beneficial effect on all areas of rolling.

As shown in Fig. 1, the support crossbeams 2 are fixed in the uprights 1 and the support traverse 3 is adjustable. In them HiH are the work rolls 4 exchangeable bearings. All of the work rolls can be operated directly via intermediate rolls or rollers 5 likt or simply after (Fig. 2) respectively. double for dividing the rolling pressure (Fig. 3). They are supported by balls 6 (Fig. 5) or Rollers 7 (Fig. 6) which are hydraulically loaded by pistons 8 and in cylinders the Traverseh 2 and 3 are housed. The cylinders are connected to a supply line 9 and 10 connected and are located in the upper traverse 3 of the Cylinders 11 are supplied with pistons 12. The piston surfaces 12 and the support piston 8 are dimensioned and arranged so that they fully complement each other. The pistons 12 are pressed by a filling pressure on the adjusting spindles 13 by adjusting them the size of the roll gap is set, which is done in a known manner by the nuts 14 takes place. These are stored in the stands 1. The filling pressure is also applied all pistons 8 in the upper and lower traverse 2 and 3 and there will be the balls 6 or rollers 7 with the work rollers 4 or intermediate rollers 5 to the plant brought.

When the rolling stock enters the work rolls 4 are through the Rolling pressure loaded, which tries to separate the support beams 2 and 3 Press, whereby the lower cross member 2 is fixed, while the upper one is the force is absorbed by the liquid in the cylinder 11, because the piston 12 Support on the setting spindles 13. The fluid pressure in the cylinders 11 is transmitted via the supply lines 9 and 10 to the piston 8, so that the Rolling pressure on the roll ball is lifted with an equal force. at an arrangement of 2 or more intermediate rollers (Fig. 3), the pistons 8 dimensioned accordingly that the work rolls are also relieved.

The filling pressure of the system with the cylinders of pistons 8 and 12 through The supply lines 9 and 10, as shown in Fig. 4, pass through the pulp 15 Via the check valve 16. Fluid losses that occur are caused by en Piston 18 balanced in cylinder 17, which is driven by a} variable-speed motor 19 will. With this device 17, 18 and 19 it is not only possible to compensate for leakage losses , but also fine adjustments of the roll gap are made, if the filling quantity is increased above the normal starting dimension.

with one-sided loading of the work rolls, what a different Pressure in the left and right cylinders, 8ur in sequence, can each cylinder 11 a own system according to Figure 4.

In special cases, where individual sections of the rollers are loaded, each load part can have its own cylinder 11 with piston 12 and cylinder 8 received, which are probably connected to a common filling pressure, but over Valves 20, 21 and 22 can be connected to the control 16, 17, 18 and 19.

While the forces on the roller balls cancel each other out and no bending of the bale is possible, the support beams 2 and 3 are on Bending stressed. The deflection caused by this remains without distortion on the roll body to be supported because the connection was hydraulically loaded Balls 6 or via rollers 7, which are equipped with self-aligning bearings are.

The fine control with devices 17, 18 and 19 also enables to compensate for the expansion of the stand 1 caused by the rolling pressure, if the roller spacing or the thickness of the rolling stock is used as a standard variable.

The invention makes it possible for machines to do the rolling process as the main movement, lighter, smaller and therefore more economical in the future manufacture and keep in operation. Blank page

Claims (8)

lJaFertansariche g rolling mill and similar machines characterized that the work rolls (4) are hydraulically relieved of bending forces. 2) rolling mill and similar machines according to claim 1, characterized in that that the work rolls (4) are mounted in support cross members (2,3) and cylinders with Contain pistons (8) and (12) which absorb the fold pressure with a liquid and via balls (6) or rollers (7) opposite to the pressure on the balls transferred and the forces correspond to the respective rolling pressure. 3) Rolling mill and similar Ischinen characterized by a common with a filling pump (15) provided supply line (9), the leakage losses through a cylinder and piston (17, 18) and variable speed drive (19) are balanced. 4) rolling mill and similar machines according to claim 3 characterized by fine adjustment of the roll gap by changing the content the supply line (9) by means of a regulating motor (19) 5) Rolling mill and similar machines according to claims 1 to 4, characterized by the relief of the loaded roller section through assigned pistons (Fig. 7) and valves (20). 6) rolling mill and similar machines according to claim 1 to 5 characterized (Fig. 3) by one or more intermediate rolls or rolls (5) between the work rolls (4) and the hydraulically loaded balls or rollers (6,7). 7) rolling mill and similar machines according to claim 1 to 6, characterized in that that the pipe (9) the opposite cylinder in the lower and upper Support traverse supplied. 8) rolling mill and similar machines according to claim 4 characterized by using the fine control (17, 18, 19) to maintain the roll gap respectively the thickness of the rolled stock.