EP3525945B1 - Cross-rolling mill - Google Patents

Description

The invention relates to a cross rolling mill according to the preamble of claim 1.

DE 34 06 841 A1 describes a three-roller conical cross-rolling mill, in which a swiveling around an axis can take place for the adjustment of the roller shafts.

In other known cross roll arrangements, for example according to the Assel method, the roll shaft can also be adjusted around two different axes. In order to decouple the transverse forces occurring during the adjustment between the contact surfaces, intermediate elements are required which increase the overall height of the employment.

It is the object of the invention to provide a cross-rolling mill in which a low-friction adjustment of the roller shafts is made possible.

This object is achieved according to the invention for a cross-rolling mill mentioned at the outset with the characterizing features of claim 1. Due to the pivotability of the plunger, a simple and low-friction position compensation between the roller shaft and the actuator is made possible, which can take place in particular in several directions.

The number of roller shafts can preferably be two, three or even four. In particular, the cross rolling mill can work similarly according to the Assel method or at least the Assel method.

Alignment of the roller axis around the positioning axes is meant geometrically in the sense of the invention, so that the positioning axes do not have any physical waves or Must include something similar. The adjusting axes can preferably each be oriented perpendicular to the roller axis, in particular also perpendicular to one another.

Within the meaning of the invention, an actuator can be any actuator by means of which the roller axis is adjusted. In particular, hydraulic cylinders or electromechanical actuators can be provided. The actuator can generally preferably be designed to exert the rolling force on the workpiece.

In a preferred embodiment of the invention, it is provided that the roller shaft has at least one rotary bearing and a pivotable pressure stilts at two opposite ends. In this way, a complete and particularly low-friction adjustable support can take place via the pivotable pressure stilts.

In the interest of a simple and effective construction, it is generally advantageous that the roller shaft is received on a roller mill, the roller mill being mounted so as to be movable about the positioning axes and the pressure stilts being supported relative to the roller mill. The roller mill can be designed as a frame which is rigid in itself but can be moved relative to a frame.

In an advantageous detailed design, the roller mill is subjected to force by means of a preferably hydraulic tension member against the direction of the rolling force. Together with the forces of the actuators, a play-free holding of the roller in its respective position is thus achieved overall.

In a preferred embodiment of the invention, the pressure stilts have at least one end with a bearing cap which can be pivoted relative to the pressure stilts. This allows a simple lateral offset of one Point of contact of the pressure stilts or the bearing cap. In addition, the bearing cap can be easily replaced as a wearing part.

In the interest of a variable employment, it is preferably provided that the pressure stilts can be pivoted from an neutral position in every spatial direction by an angle about a pivot point.

Generally advantageous are at least two roller shafts, preferably at least three roller shafts, particularly preferably all of the roller shafts of the cross-rolling mill are adjustable in accordance with one of the features described above.

In general, from a bearing arrangement of the roller shaft or roller shafts according to the invention, there is a compensation for radial movements to the actuating axis. Compensation for angularity deviations perpendicular to the adjustment axis is also possible. In addition, the height and thus the frame size and weight of the cross rolling mill can be reduced by the invention.

The invention avoids or reduces frictional forces and transverse forces of the adjustment components. There is also the advantage of improved positioning accuracy under load. Furthermore, the vibration behavior of the adjustment system is improved and the overall rigidity is increased.

Further advantages and features result from the exemplary embodiment described below and from the dependent claims.

Fig. 1

zeigt eine teilweise Schnittansicht eines erfindungsgemäßen Schrägwalzwerks.

Fig. 2

zeigt eine schematische Schnittansicht einer verschwenkbaren Druckstelze entlang der Schnittlinie A-A aus Fig. 3.

Fig. 3

zeigt eine Draufsicht auf die Druckstelze in aus Fig. 2 in vier extremalen Schwenkpositionen.

A preferred embodiment of the invention is described below and explained in more detail with reference to the accompanying drawings.

Fig. 1

shows a partial sectional view of a cross rolling mill according to the invention.

Fig. 2

shows a schematic sectional view of a pivotable pressure stilts along the section line AA from Fig. 3 ,

Fig. 3

shows a top view of the pressure wilt in FIG Fig. 2 in four extreme swivel positions.

This in Fig. 1 The diagonal rolling mill shown according to the invention comprises three roller shafts 1 of identical construction, of which only one can be seen in the illustration. The roller shaft 1 has a roller body 2 which acts on a workpiece radially to a roller axis W or in the direction of a rolling force. The roller shaft 1 is rotated about the roller axis W via a cardanically articulated drive shaft 3.

A rotary bearing 4, 5 supporting the rolling forces is arranged in front of and behind the roller body 2. The rotary bearings 4, 5 are in turn received and supported on a roller mill 6, the roller mill 6 being held movably relative to a frame 8 of the cross-rolling mill by means of a bearing 7. The roller mill can be pivotably adjusted both about a first adjusting axis S1 and about a second adjusting axis S2. The second positioning axis S2 follows in the illustration Fig. 1 perpendicular to the plane of the drawing. The positioning axes S1, S2 and the roller axis are perpendicular to each other, but do not have to intersect.

The roller mill 6 is formed as a rigid component which is essentially yoke-shaped in cross section. Two support areas 6a of the roller mill hold the rotary bearings 4, 5 on the one hand and are supported on an intermediate member 9, 10 on the other hand. The intermediate members are arranged between the roller mill 6 or the rotary bearings 4, 5 on the one hand and in each case one of two actuators 11, 12 on the other hand.

The roller 1 is adjusted by aligning the roller mill 6 and thus the rotary bearings 4, 5. For this purpose, the actuators 11, 12, which are designed as hydraulic cylinders, are each positioned. The actuators 11, 12 can also transmit the rolling force exerted on the workpiece.

The roller mill 6 is also pulled against the rolling force by a tension member 13 designed as a hydraulic cylinder, so that the roller mill 6 is pressed firmly against the actuators at all times. The force of the tension member is smaller than the force of the actuators and ensures play-free positioning of the roller shaft 1 or enables the workpiece to be released.

The intermediate elements 9, 10 are each of the same design and are used to compensate for tilting and offset movements occurring during the adjustment between the actuators 11, 12 on the one hand and the roller mill 6 or the roller shaft 1 on the other. In the present case, the intermediate members 9, 10 each comprise a pressure stalk 14, 15. The pressure sticks 14, 15 can each be pivoted in several directions. This is achieved by spherical bearings of the pressure stilts 14, 15.

In the present case, the pressure stilts are each provided on the actuator side with a concave dome surface 14a, 15a, a corresponding convex dome surface being provided on the actuator. On the side of the roller shaft, the pressure stilts are also provided with a concave spherical surface 14b, 15b.

An essentially hemispherical spherical cap 16, 17 is inserted into the end of the plunger 14, 15. This can be pivoted with respect to the pressure stilts via the spherical surface 14b, 15b and bears against the roller mill 6 with a flat counter surface. In this way, a lateral offset of the counter surface with respect to the roller mill can also be made possible if necessary.

It goes without saying that in other embodiments, domes which are curved in reverse can also be provided, for example convex domes on the pressure stilts 14, 15 and correspondingly concave domes on the actuators 14, 15 and / or the bearing domes 16, 17.

The adjustment of the roller mill around in the drawing plane Fig. 1 vertical actuating axis S1 takes place via further actuating devices, not shown, which act perpendicular to the drawing direction and thus not in the direction of the rolling force. Overall, the pressure stilts 14, 15 can be pivoted from a neutral position in each spatial direction by a minimum angle about a pivot point. The fulcrum lies in the geometric center of the calotte surface on the actuator side.

This is particularly true in Fig. 3 clarifies, in which a plunger 14, 15 is shown, which is pivoted in four different exemplary spatial directions by an angle up to a stop. A maximum lateral offset d of the counter surfaces of the bearing caps 16, 17 is made possible by the pivoting.

LIST OF REFERENCE NUMBERS

1

roller shaft

2

roller body

3

Drive shaft, cardan joint

4

first pivot bearing

5

second pivot bearing

6

roll mill

6a

Support areas of the roller mill

7

Storage of the roller mill

8th

frame

9

first pontic

10

second pontic

11

first actuator

12

second actuator

13

tension member

14

first pressure stilts

14a

concave dome surface

14b

concave dome surface

15

second pressure stilts

15a

concave dome surface

15b

concave dome surface

16

first bearing cap

17

second bearing cap

W

roll axis

S1

first positioning axis

S2

second positioning axis

d

lateral offset

Claims (7)

1. Cross-rolling mill, comprising
   a plurality of roll shafts (1) which each exert a substantially radially directed rolling force on a workpiece,
   wherein the orientation of a roll axis (W) of at least one of the roll shafts (1) is variably settable about a first setting axis (S1) and about a second setting axis (S2),
   wherein an intermediate element (9, 10) is arranged between a rotary bearing (4, 5) of the roll shaft (1) and a setting element (11, 12),
   characterised in that
   the intermediate element (9, 10) comprises a pressure leg (14, 15) which transmits the rolling force and which is pivotable in a plurality of directions by means of a spherical bearing surface (14a, 14b, 15a, 15b).
2. Cross-rolling mill according to claim 1, characterised in that the roll shaft (1) has at two opposite ends in each instance at least one rotary bearing (4, 5) and a pivotable pressure leg (14, 15).
3. Cross-rolling mill according to one of the preceding claims, characterised in that the roll shaft (1) is mounted on a roll chair (6), wherein the roll chair (6) is mounted to be movable about the setting axes (S1, S2) and the pressure legs (14, 15) are supported relative to the roll chair (6).
4. Cross-rolling mill according to claim 3, characterised in that the roll chair (6) is loaded with force by means of, in particular, a hydraulic tension element (13) against the direction of the rolling force.
5. Cross-rolling mill according to any one of the preceding claims, characterised in that the pressure leg (14, 15) has at at least one end a spherical bearing (16) pivotable relative to the pressure leg.
6. Cross-rolling mill according to any one of the preceding claims, characterised in that the pressure leg (14, 15) starting from a neutral position is pivotable about a fulcrum in any spatial direction through an angle.
7. Cross-rolling mill according to any one of the preceding claims, characterised in that at least two roll shafts (1), particularly at least three roll shafts, particularly all of the roll shafts of the cross-rolling mill, are mounted to be adjustable in accordance with any one of the preceding claims.

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