JPH0525568B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a rolling mill unit with at least three roll stands, each roll stand consisting of rolls with a smooth roll surface. It has pairs of rolls angularly offset from each other by 90°, these roll pairs can be driven separately and the rolls can be adjusted symmetrically with respect to the axis of the flat steel, and the narrow side of the flat steel A pair of rolls arranged corresponding to (the short side of the flat steel with a rectangular cross section) is adjusted to move with respect to the axis of the flat steel in order to guide the wide side of the flat steel (the long side of the flat steel). The present invention relates to a rolling equipment for rolling flat steel of the type that cooperates with possible rolling material guides.

BACKGROUND TECHNOLOGY In order to manufacture steel bars with a rectangular cross section, so-called flat steel bars, which are required in large quantities and have various cross-sectional dimensions today, a continuous rolling mill is constructed by arranging a plurality of roll stands in a row. It is known to form relatively compact rolling mill units (DE 916 165) or relatively compact rolling mill units (DE 23 26 723). In such rolling mills, however, the roll stands are fixedly aligned with each other;
The direction of passage of the rolled material must always be the same.

Furthermore, in this case a separate roll stand is provided for each pass required from the initial cross section to the final cross section, and the rolled material is passed through a number of these roll stands in the direction over a correspondingly long distance. It must be allowed to pass while being turned and turned. Although the extremely long rolling equipment formed by this method is expensive to manufacture, it can only roll steel bars with a specified cross section, and changing the rolling program requires large-scale replacement. Work is required. Furthermore, due to the long transit times there is a risk of premature cooling of the rolled material and edge breakage, so it is necessary to carry out intermediate heating in order to avoid crack formation during rolling.

German Patent Application No. 2 254 676 discloses a reversible roll stand, which, however, is used exclusively as a single stand, with only one side of the flat steel, i.e. the width or the height. It is not suitable for processing. The range of use of this known roll stand is limited from the beginning, since the rolling stock guide arranged correspondingly on the other side can only be adjusted in movement to change the rolling program and not after each pass.

Problem of the Invention Therefore, the problem of the present invention is that it is outstanding in that it requires only an extremely small space, has a compact structure, allows for extremely short transit times, and can be used in a rational manner using flat steel. It is an object of the present invention to provide a rolling equipment that guarantees production and can process any square steel from square to extremely rectangular cross sections without troublesome replacement work.

Means for Solving the Problem In order to solve this problem, the configuration of the present invention includes:
In rolling equipment of the type mentioned at the beginning, all roll stands of the rolling mill unit are reversible, rolling material guides are arranged before and after the associated pair of rolls, and each rolling material guide 2 that can be adjusted to move symmetrically with respect to the axis of
It consists of two guide parts, in order to reverse the direction of passage of the rolled material for the purpose of continuous cross-sectional reduction, between the roll drive and the rolls. The drives are equipped with a numerical control device which controls these drives in accordance with a defined rolling program each time the rolled material passes through the rolling mill unit.

Example Next, embodiments of the present invention will be described with reference to the drawings.

The rolling installation shown in FIG. 1 consists of five roll stands 2, 3 combined into one common rolling mill unit 1, of which roll stand 2 has a smooth roll surface. The roll stands 3 each have a pair of vertical rolls 5 with smooth roll surfaces.
The roll pairs 4, 5 can be driven independently of one another, each roll drive having an alternating current electric motor 6, an adjustable hydraulic pump 7 and a hydraulic motor 9 connected to the hydraulic pump 7 via a hydraulic line 8. The hydraulic motor 9 rotates the rolls 4 and 5 via a transmission 10 and a cardan shaft 11. In this case, the roll rotation speed can be varied steplessly by changing the rotation angle of the regulating pump (hydraulic pump 7), and the direction of rotation of the roll can also be reversed via this regulating pump.

The rolls 4, 5 are mounted in roll stands 2, 3 in an adjustable manner between the rolls, for which purpose the roll bearings 12 of each pair of rolls are connected to the adjusting gear 1.
3 can be offset symmetrically with respect to the roll center. This adjusting gear 13 is driven via a hydraulic motor 14 . This hydraulic motor 14, which serves as a drive for the adjustment between rolls, has
A common hydraulic pump 1 connected to an electric motor 16 via an attached hydraulic valve and a supply conduit 15
Pressure medium is supplied from 7.

In order to roll the flat steel by rolls 4, 5 with smooth roll surfaces, rolling stock guides 18 are assigned to the vertical rolls 5, these rolling stock guides 18 having a rectangular cross section. In order to roll the narrow side of the flat steel (the short side in the cross section of the flat steel), the wide side of the flat steel (the long side in the cross section of the flat steel) is guided to prevent the flat steel from turning during rolling. In order to adapt to different cross-sections, these rolling stock guides 18 can be adjusted vertically, this adjustment also being controlled by a hydraulic motor connected via hydraulic valves to the supply line 15 and to the hydraulic pump 17. 19 (drive device for adjusting the movement of the rolled material guide). As shown in FIGS. 2 and 3, each rolling material guide 18 consists of two L-shaped sections 18' forming a rectangular cross-section 20, both L-shaped sections 18' serving as guide sections. The horizontal guide legs 18'' protrude like tongues between the rolls and may hold the rollers in a manner not shown in order to avoid damaging the surface of the rolled material.L-shaped part 18' are attached to a vertical guide 21 and can be moved in opposite directions by means of a displacement adjustment shaft 22 cooperating via a rack 24 and pinion 23 fixed to the L-shaped part 18'. For this purpose, the displacement adjusting shaft 22 is drivingly connected to a hydraulic motor 19.

In the rolling mill unit 1, which has a pair of horizontal rolls 4, a pair of vertical rolls 5, a reversible roll drive device, and a rolled material guide 18 whose movement can be adjusted, the distance between the rolls can be adjusted. For each roll, a plurality of passes can be performed in succession without interruption, and by repeating passes in the opposite direction, it is possible to roll an arbitrary number of passes, and a wide variety of flattened cross sections can be obtained. The hydraulic pump 7 for the roll drive, the hydraulic valve for the hydraulic motor 14 for adjusting the distance between the rolls, and the hydraulic valve for the hydraulic motor 19 for adjusting the movement of the rolled material guide 18 are connected to corresponding control lines. 26, 27, 28
The numerical control device 25 controlled via the control base 2
Adjustment values synchronized with each other, such as roll rotation direction, roll rotation speed, roll-to-roll value, and rolling material guide movement adjustment value, are controlled in relation to the rolling program inputted by 9. As a result, a functionally reliable course of rolling of the flat steel is ensured in a compact, reversible rolling unit consisting of several roll stands.

Effects of the Invention As can be seen from the above, when configured as in the present invention, a continuous and reversible rolling mill capable of performing a number of passes corresponding to the number of roll stands in each pass can be obtained. is obtained. Due to the reversibility, it is also possible to carry out only an arbitrary number of passes with this rolling mill, for which purpose the rolled material simply has to be fed through the mill in both directions the corresponding number of passes. Between the rolls: By using roll pairs with adjustable and smooth roll surfaces and offset by 90° from each other, it is possible to roll flat steel with any rectangular cross section. Moreover, the rolled material guides ensure that the rolled material does not turn or deviate from the center of rolling even when the cross section is extremely small, so that virtually everything from initial billets to arbitrary flat cross sections can be avoided. can be carried out in this reversible rolling mill. In order to readjust the roll stands after each pass of the rolled material and to align the roll stands with one another for the purpose of continued processing when changing the pass direction, the respective drives and displacement adjustment drives are alternated via a numerical control device. It is controlled depending on the direction of passage and the successive processing steps. This numerical control allows programmable adjustment and monitoring of the rolls, individual drives for roll-to-roll adjustment and rolling material guidance, and also facilitates the selection of different rolling programs. This also ensures a precise rolling process in each case. This makes it possible to manufacture flat steel in an extremely short time and in an extremely rational manner.
It becomes possible to install the entire rolling installation with reversible rolling mill units in a relatively small space.

[Brief explanation of the drawing]

FIG. 1 is a plan view schematically showing a rolling equipment according to the present invention, FIG. 2 is a horizontal sectional view of a rolled material guide, and FIG. 3 is a front view of the rolled material guide. 1... Rolling mill unit, 2, 3... Roll stand, 4, 5... Roll, 6... AC motor, 7
... Hydraulic pump, 8 ... Hydraulic conduit, 9 ... Hydraulic motor, 10 ... Transmission device, 11 ... Cardan shaft,
12...Roll bearing, 13...Adjustment transmission, 1
4... Hydraulic motor, 15... Supply conduit, 16...
Electric motor, 17... Hydraulic pump, 18... Rolled material guide, 18'... L-shaped part, 18''... Guide leg,
19... Hydraulic motor, 20... Rectangular cross section, 21
... Vertical guide, 22 ... Movement adjustment axis, 23 ...
Pinion, 24... rack, 25... numerical control device, 26, 27, 28... control lead wire, 29... control stand.

Claims (1)

[Claims] 1. At least three roll stands combined in one rolling mill unit are provided, the roll stands having roll pairs angularly offset by 90° to each other, consisting of rolls with smooth roll surfaces; These pairs of rolls can be driven separately and the rolls can be driven symmetrically with respect to the axis of the flat steel.
A pair of rolls, which are adjustable and are arranged corresponding to the narrow side of the flat bar, cooperates with a rolled material guide that is adjustable and movable relative to the axis of the flat bar to guide the wide side of the flat bar. In the rolling equipment for rolling flat steel of the type shown in FIG.
are placed before and after the affiliated role pair 5,
In addition, each rolled material guide 18 consists of two guide parts 18' which can be moved and adjusted symmetrically with respect to the axis of the flat bar, so that the direction of passage of the rolled material can be reversed in order to continuously reduce the cross section. In order to do this, the roll drives 7, 9 and the roll-to-roll adjustment drive 14 and the drive 19 for adjusting the movement of the rolled material guide 18 are connected each time after the rolled material has passed through the rolling mill unit 1. A rolling equipment for rolling flat steel, characterized in that it is equipped with a numerical control device 25 that controls a drive device according to a prescribed rolling program.