EP1142652B1 - Cold strip rolling mill, in particular fine strip and foil rolling mill, with a roll cooling and/or lubricating device for cold strip rolling mills, in particular fine strip and foil rolling mills - Google Patents

Description

The invention relates to a cold strip rolling mill, in particular Fine strip and foil rolling mill, with a Walzenkühl- and / or Lubricating device associated with the individual rollers, to the Side plates of the roll stand of one or more Roll stand mounted nozzle beam, in the across the width of the Roller spray nozzles are fitted with control valves and the by means of a linear drive in the direction of its longitudinal axis independently of one another transversely to the running direction of the rolled strip in to the band level parallel planes are adjustable, for regulation the tape tension over the bandwidth by changing the effective roll bale diameter and / or an influence the roll lubrication with a pressure and / or quantity and / or temperature-controlled supply of rolling oil or emulsions.

The flatness control of the rolled strip at a Cold strip mill, which with a from DE 34 19 261 C3 known Walzenkühl- and / or lubricating device of equipped type is based on a change the spray pattern of the on the surface of the work rolls sprayed on rolling oil or sprayed emulsions. The Change of spray pattern is caused by an adjustment of each Work roll of the mill associated nozzle beam relative to Work roll independent of the other nozzle beam across the Tape running direction in a plane parallel to the belt plane and a pressure and / or quantity and / or temperature-controlled Supply of rolling oil or emulsions causes.

Fine and foil tape, on a with the well-known Flatness control equipped Quarto or Sexto rolling mill is rolled, characterized by a high quality in terms of dimensional and form accuracy as well as flatness.

A disadvantage of the roller cooling and / or lubricating device for a cold strip mill of the generic type is the insufficient accessibility of the nozzle bars with the spray nozzles and the associated control valves, so that repair and Maintenance work on the nozzle beam cumbersome and time consuming.

The invention is based on the object, the regulation of Strip flatness in the generic cold strip rolling mills with To optimize roll cooling and / or lubricating devices in order to undesired band tension deviations zone by zone in ruled out rolled strip, and the accessibility of the in the Nozzle bar of the roller cooling and / or lubricating device built - in spray nozzles and their associated control valves in With a view to simplification and acceleration of necessary repair and maintenance work.

This object is achieved by a Cold strip mill with a Walzenkühl- and / or Lubricating device with the features of claim 1.

The subclaims include advantageous and expedient Further developments of the invention.

The cold strip rolling mill according to the invention is characterized following advantages:

The spray angle of the spray nozzles of the nozzle beam with respect on the rollers, by pivoting the nozzle bars around the Balkenlängsachse is adjustable, provides another manipulated variable in addition to the adjustability of the nozzle bars relative to the each associated roller transverse to the direction of tape travel and the Change in the amount, pressure and temperature of the on the Rolling sprayed on rolling oil or the sprayed emulsions to change the spray pattern on the roller surface in the frame a band flatness control. The spray angle of Spray nozzles as an additional control variable allows one Optimization of the band flatness control. By pivoting the Nozzle bars around 180 °, the spray nozzles in a simple way the roll near operating position in a roller facing away Maintenance position for easy and quick execution of required maintenance and repair work on the spray nozzles to be brought. The attached to the rolling stands Positioning devices enable a simple method of Nozzle bar from the operating position on the rollers in one of this remote maintenance position in which the entire Nozzle bar easily accessible for repair and maintenance work are. By the successive circuit of the opening or closing control valves of the spray nozzles in a certain time with a time delay may be the pressure in the coolant supply lines of the spray nozzles regardless of the Number of actuated nozzles kept largely constant be so that liquid shocks due to Pressure fluctuations, damage to the Lead coolant lines and the control valves, avoided become. The rotary valve, which at the spray nozzles of the roller cooling and / or lubricating device is needed with the Actuator, because of the small mass of the slide only one low force must apply, very little space, so that the Installation space of each individual required over the bandwidth Spray nozzle compared to known Walzenkühl- and / or Lubrication devices is much smaller and the Spray zone width of the spray nozzles reduced accordingly and thereby the accuracy of the band flatness control essential can be improved.

Fig. 1

eine perspektivische Darstellung eines Quartowalzgerüstes mit Düsenbalken zum Kühlen und Schmieren der Arbeitswalzen und der Stützwalzen,

Fig. 2

eine Vorderansicht der Düsenbalken nach Fig. 1,

Fig. 3

eine Schnittdarstellung einer Dreh- und Schiebelagerung eines Endes eines in der Betriebsposition befindlichen Düsenbalkens,

Fig. 4

eine Schnittdarstellung einer Dreh- und Schiebelagerung eines Düsenbalkens in der gegenüber der Darstellung in Fig. 3 um 180° gedrehten Wartungsposition,

Fig. 5

ein Quartowalzgerüst mit Düsenbalken in der Wartungsposition, einen Abwickelhaspel und Vorrichtungen zum Einführen des Walzbandes in den Walzspalt,

Fig. 6

ein Quartowalzgerüst entsprechend Fig. 5 mit Düsenbalken in der Betriebsposition,

Fig. 7

die Steuerung der Sprühdüsen bei einem Quartowalzwerk,

Fig. 8

eine Längsschnittdarstellung einer mit einem Drehschieber ausgerüsteten Sprühdüse in der Schließstellung,

Fig. 9

eine der Fig. 8 entsprechende Darstellung der Sprühdüse in der Offenstellung und

Fig. 10

eine abgeänderte Ausführung der Sprühdüse gemäß den Figuren 8 und 9.

The invention is explained below with reference to schematic drawings of a roller cooling and / or lubricating device used in a four-high rolling stand, wherein the drawing figures represent the following:

Fig. 1

a perspective view of a four-high stand with nozzle beam for cooling and lubricating the work rolls and the backup rolls,

Fig. 2

a front view of the nozzle bars of FIG. 1,

Fig. 3

a sectional view of a pivotal and sliding bearing one end of a nozzle located in the operating position bar,

Fig. 4

a sectional view of a rotary and sliding bearing of a nozzle beam in the relation to the illustration in Fig. 3 rotated by 180 ° maintenance position,

Fig. 5

a four-high stand with nozzle bar in the maintenance position, a decoiler and devices for introducing the rolled strip into the nip,

Fig. 6

a four-high stand according to FIG. 5 with nozzle bars in the operating position,

Fig. 7

the control of the spray nozzles in a quarto mill,

Fig. 8

a longitudinal sectional view of a equipped with a rotary valve spray nozzle in the closed position,

Fig. 9

one of the Fig. 8 corresponding representation of the spray nozzle in the open position and

Fig. 10

a modified embodiment of the spray nozzle according to FIGS. 8 and 9.

The quarto mill 1 of Fig. 1 is not by two represented roll stand formed in which in not chocks shown a lower and an upper Work roll 2, 3 and a lower and an upper support roller 4, 5 are rotatably mounted.

The usable for the flatness control of the rolled strip 6 Roll cooling and / or lubricating device for the work rolls 2, 3 and the support rollers 4, 5 each consist of a nozzle bar 7, 8 for the work rolls 2, 3 and a respective nozzle bar 9, 10 for the back-up rolls 4, 5.

Into the nozzle bars 7-10 are across the width of the rollers Spray nozzles 11 with upstream, as solenoid valves trained control valves 12 for applying cooling oil and / or emulsions incorporated on the rollers 2-5. The the Back-up rolls 4, 5 associated nozzle bars 9, 10 are stationary, while the work rolls 2, 3 associated nozzle bars 7, 8 in the direction of arrow b, c in the direction of its longitudinal axis 13-13 across Moved to the tape travel direction a over the bandwidth and order their longitudinal axis 13-13 are pivotable.

The respective supply of rolling oil and / or emulsions too the adjustable nozzle bars 7, 8 and the stationary Nozzle bar 9, 10 is pressure and / or quantity and / or temperature-controlled.

By moving the nozzle bars 7, 8 in the direction of Beam longitudinal axis 13-13 transverse to the direction of a rolled strip. 6 and by pivoting the nozzle bars 7, 8 around the Beam longitudinal axis 13-13 for adjusting the spray angle of the Spray nozzles 11 to the work rolls 2, 3 are the Spray zone width of the spray nozzles 11 on the work rolls 2, 3rd and set the spray pattern of the spray nozzles 11. The regulation pressure, temperature and quantity of the nozzle bar 7, 8 fed rolling oil or the emulsions supplied affects the cooling of the work rolls 2, 3 and thus the Size and the speed of change of the effective Roll bale diameter and dependent of this Roll nip 14 between the work rolls 2, 3 respectively the lubrication of the work rolls.

The flatness measuring roll, not shown in FIG Belt outlet behind the set of rollers measured values of Bandzugspannungsverteilung over the bandwidth of the rolled strip. 6 are processed in a computer and used to control the Cooling and / or lubrication of the work rolls 2, 3 means the movable and pivotable nozzle bar 7, 8 used.

By an accurate positioning of the in the direction of Beam longitudinal axis 13-13 transverse to the direction of travel a movable and about the beam longitudinal axis pivotable nozzle beam 7, 8 with the spray nozzles 11 can be undesirable Bandzugspannungsabweichungen zone by zone in the rolled strip 6 controlled and thereby a flat band are generated.

At the two ends 15, 16 of the work rolls 2, 3rd associated two nozzle bars 7, 8 are adapters 17 to rotatable and movable storage of the nozzle bar around and in Direction of the beam longitudinal axis 13-13 on two hollow bearing journals 18, 19 mounted in the side plates 20, 21 at the two Roller stands, not shown, of the four-high rolling mill 1 are installed, wherein the supply of the coolant or the emulsions to those in the nozzle bars 7, 8 built-in spray nozzles 11 and the associated control valves 12th through a supply line 22 in a side plate 20, the cavity 23 of the built-in the side plate 20 bearing pin 18, the Interior 24 of the seated on the journal 18 adapter 17th and the distribution channel 25 of the nozzle bars 7, 8 takes place.

The supply of the coolant to the nozzle bars 7, 8 can also by a respective supply line 22 in both side plates 20, 21, the built-in hollow journals 18, 19, the on this seated adapter 17 and the distribution channel 25 of the Nozzle bars take place.

On the two bearing pins 18, 19 of the nozzle bars 7, 8 are hydraulic actuating cylinder 26, 27 with the adapters 17th engaging actuating piston 28 for displacing the nozzle bars 7, 8 in the direction of arrow b, c transversely to the direction a of the rolled strip. 6 arranged.

At the two side shields 20, 21 is ever one on one Adapter 17 attacking rotary drive 29 for pivoting the Nozzle bar 7, 8 grown around its longitudinal axis 13-13.

The connecting cable for the control valves 12 of the spray nozzles 11th the nozzle bars 7, 8 are in several flexible protective tubes 30 merged, the length of the connecting cable of the Control valves is dimensioned such that a pivoting of the Nozzle bar 7, 8 about the beam longitudinal axis 13-13 is possible.

For repair and maintenance work on the spray nozzles 11 the nozzle bars 7, 8 from the operating position shown in FIG. 3 pivoted by 180 ° in the maintenance position shown in FIG be in which the work rolls 2, 3 facing away spray nozzles 11 are freely accessible. Maintenance and repair work on the Control valves 12 of the nozzle bars 7, 8 are useful in the Operating position of the nozzle beam of FIG. 3 performed.

Notwithstanding the above-described embodiment of Roll cooling and / or lubricating device is possible In addition, a displaceability and a pivoting of the Nozzle bar 9, 10 for the support rollers 4, 5 in the direction of or to provide the beam longitudinal axis.

In the case of FIGS. 5 and 6 shown Quartowalzgerüst 1, the rolled strip 6 is withdrawn from a uncoiler 31 and via a tape insertion unit 32, which consists of a first Air cushion conveyor 33, a separating knife 34, a second Air cushion conveyor 35 and a roller unit with two in Tape running direction a spaced apart Pulleys 36, 37 and one between them, with a third air cushion conveyor 38 combined tensioner 39, promoted in the nip 14. The Bandeinführeinheit 32 is on a machine frame 40th arranged in the direction of tape a forward and opposite to the Tape running direction in the direction of arrow d can be moved back.

At the four-high stand 1 is a positioning device 41st for moving two nozzle bars 7, 8 for the lower and the upper work roll 2, 3 and another nozzle bar 10 for the upper support roller 5 from the remote maintenance position 7a, 8a, 10a in the operating position 7b, 8b, 10b to the rollers 2, 3, 5 arranged.

The positioning device 41 consists of two Bandeinlaufseitig at the two roll stands 42 of the Quarto roll stand 1 arranged, in the vertical direction e, f movable lifting beam 43 and two on these in horizontal Direction g, h movable carriage 44 with cranked Supporting arms 45, at the lower ends 46, the two nozzle bars 7, 8 for the two work rolls 2, 3 and at the top Sections 47 of the nozzle bar 10 and a scraper 48 for the upper support roller 5 are attached.

Further, at the lower ends 46 of the support arms 45 of Carriage 44 baffles 49, 50 for threading the rolled strip 6 in the roll gap 14 attached.

The nozzle bar 9 for the lower support roller 4 is at the in Arrow direction a, d movable machine frame 40 of Bandeinführeinheit 32 arranged.

In a rolling mill with several rolling stands 1 can from the second rolling stand behind the unwinding reel 31 of the nozzle bar 9 for the lower support roller 4 at the extended lower ends 46 of the support arms 45 of the positioning device 41 is attached become.

When moving the nozzle bar 7, 8, 1o from that in FIG. 5 shown maintenance position 7a, 8a, 10a in the Operating position 7b, 8b, 10b of FIG. 6 are first the Support arms 45 with the nozzle bars 7, 8, 10 by means of the carriage 44 in the direction of arrow g in front of the tape insertion unit 32, Thereafter, the nozzle bars 7, 8, 10 with the lifting bar 43 in Direction of arrow e lowered to the working height, then the Nozzle bar 7, 8, 10 with the carriage 44 in the Operating position 7b, 8b, 10b moved up to the rollers 2, 3, 5 and finally, the tape insertion unit 32 is connected to the Nozzle bar 9 for the lower support roller 4 in the strip running direction a advanced to the rollers.

The method of the nozzle bars 7, 8, 10 and 9 from the Operating position 7b, 8b, 10, b, 9b in the maintenance position 7a, 8a, 10a, 9a happens in reverse order.

In the control of the spray nozzles 11 shown in FIG the work rolls 2, 3 and the support rollers 4, 5 a Quarto roll stand 1 associated nozzle bars 7-10 are the Control valves 12 of the spray nozzles 11 by solenoid valves 51st pneumatically piloted.

Instead of the pneumatically piloted control valves 12 for the spray nozzles 11 can also be used as solenoid valves trained control valves are used.

The nozzle bars 7-10 are via distribution lines 52-54 and a main supply line 55 for the coolant with a Control valve 56 for pressure and flow control of the coolant a feed pump, not shown, the coolant circulating system connected.

In the occurrence of long positions in the rolled strip, by Planheitsmeßeinrichtungen can be found is on These locations by means of the spray nozzles 11 cooling liquid on the Work rolls 2, 3 and back-up rolls 4, 5 sprayed. Thereby becomes the effective roll bale diameter in this range reduced by the cooling. The running off of the rollers Coolant is in a drip pan 57 below the Roll stand 1 collected and returned to the coolant circulation system fed.

The opening or closing of the control valves 12 of Spray nozzles 11, e.g. forty pieces, takes place in a particular Sequence in a time of, for example, one second, that is, the individual spray nozzles 11 are at a time interval of approx. switched twenty five milliseconds. Switching sequence and Time intervals are controlled by a computer 58.

By such a control, a change in the Liquid flows achieved in the case of a fast Pressure control pressure fluctuations can be avoided, so that the flow rate per control valve remains constant and no harmful liquid shocks can occur.

The at the same distance transversely to the strip running direction a in a cylindrical nozzle bar 59 a Walzenkühl- and Lubricating device arranged spray nozzles 11 according to FIGS. 8th and 9 are incorporated as compact units in nozzle sticks 60, in corresponding openings 61, 62 in which a roller facing front wall portion 59a and the rear Wall portion 59b of the nozzle beam 59 from the back are used from the same ago, against the nozzle bar 59th are sealed and enforce the interior 63 of the same.

The spray nozzles 11 are equipped with a nozzle head 64, in a threaded bore 65 in which a roller facing front end 66 of the nozzle block 60 is screwed and a Nozzle opening 67 and an antechamber 68 has.

Further, the spray nozzles 11 with a rotary valve 69th equipped in a centric through hole 70 of the Nozzle stocks 60 about the longitudinal axis 71 - 71 of the spray nozzle eleventh is rotatably mounted in the bore 70 of the nozzle block 60th is sealed and one to the nozzle head 64 open Blind bore 72 and two diametrically opposite Has inlet openings 73 in the area of the blind bore 72, 73 in the open position 11 "of the spray nozzle 11 according to FIG. 9 two corresponding, to the interior 63 of the nozzle bar 59 out cover open inlet openings 74 in the nozzle 60 and in the closed position 11 'of the spray nozzle shown in Figure 8 11 are closed by the wall 75 of the nozzle block 60.

The nozzle 60 of the spray nozzle 11 is integral with one with this formed flange 76 on the outside of the rear wall portion 59b of the nozzle bar 59 around the Longitudinal axis 71-71 of the spray nozzle 11 limited rotatably mounted.

An actuator 77 for actuating the rotary valve 69 of Spray nozzle 11 is on the mounting flange 76 of the nozzle block 60 dismissed. As actuator 77 may be an electrical Rotary magnet, a hydraulic cylinder or a pneumatic cylinder be used. There is also the possibility of a Stepper motor for actuating the rotary valve 69 and the simultaneous flow control of the coolant and lubricant use.

With regard to the smallest possible distance Spray nozzles 11 over the width 78 of the rolled strip 6, the Actuators 77 for actuating the rotary valve 69 of Spray nozzles 11 in the direction of the nozzle axes 71 - 71 and / or arranged offset one above the other.

Furthermore, there is the possibility of a rotation of the Nozzle sticks 60 in the nozzle bar 59 for changing the spray pattern to provide the individual spray nozzles, wherein a rotary drive for each nozzle 60 or a common rotary drive for several Nozzle sticks can be used.

In the further embodiment shown in FIG a spray nozzle 79 with rotary valve 69 is the extended Nozzle head 64 on the front end 66 of the nozzle block 60th screwed. In the nozzle head 64 are two diametrically opposite inlet openings 74 arranged with two Inlet openings 73 in the area of the antechamber 68 of the Nozzle head 64 towards open blind bore 72 of the rotary valve 69th cooperate, in the antechamber 68 of the nozzle head 64th is stored centrally.

Drawing the rotary valve 69 due to the small turning stroke the spray nozzles 11, 79 by a quick control of the Opening and closing process, which is at an optimal Flatness control contributes to fine and foil tape.

Claims (4)

1. Cold strip rolling mill, in particular a fine strip and foil rolling mill, with a roll cooling and/or lubricating device, having nozzle beams (7, 8), which are assigned to the individual rolls (2, 3) and fitted on the lateral plates (20, 21) of the roll housings of one or more roll stands, spray nozzles (11) with control valves (12) being incorporated into said nozzle beams across the width of the rolls (2, 3) and being displaceable by means of a linear drive in the direction of their longitudinal axis (13-13) independently of each other transversely relative to the direction of movement (a) of the roll strip (6) in planes parallel to the strip plane, in order to control the strip tensile stress across the strip width by changing the effective roll bale diameter and/or by influencing the roll lubrication with a pressure and/or quantity and/or temperature-controlled supply of rolling oil or emulsions, characterised by the following features:

   a) the nozzle beams (7, 8) are pivotable about the longitudinal axis (13-13) in addition to the displaceability transversely relative to the direction of movement of the strip (a) by means of a rotary drive (29).

   b) on the roll stand (1) or roll stands, positioning devices (41) are disposed for moving the nozzle beams (7, 8, 10) from a maintenance position (7a, 8a, 10a), remote from the rolls, into the operating position (7b, 8b, 10b) towards the rolls (2, 3, 5) and from the operating position (7b, 8b, 10b) into the maintenance position (7a, 8a, 10a).

   c) opening or closing of the control valves (12) of the spray nozzles (11) is effected within a time of for example one second and in a specific sequence with a time interval of approximately twenty-five milliseconds, switching sequence and time interval being controlled via a computer (58)

   d) the spray nozzles (11, 79) incorporated at the same spacing in the nozzle beams (59) have a nozzle connection (60) which is inserted in corresponding openings (61, 62) in the front wall portion (59a), which is orientated towards a roll, and in the rear wall portion (59b) of a nozzle beam (59), is sealed relative to the nozzle beam (59) and penetrates the interior (63) of the same, furthermore a nozzle head (64) which is inserted in a boring (65) in the front end (66) of the nozzle connection (60), which end is orientated towards a roll, preferably is screwed in, or which (64) is placed upon the front end (66) of the nozzle connection (60), preferably screwed on, and has at least one nozzle opening (67) and a pre-chamber (68), has a rotary slide (69), which is mounted rotatably in a centric through-boring (70) of the nozzle connection (60) about the longitudinal axis (71-71) of the spray nozzle (11) and has a blind boring (72), which is open towards the nozzle head (64), and, in the region of the blind boring (72), has at least one inlet opening (73) which, in the open position (11") of the spray nozzle (11), covers a corresponding inlet opening (74), which is open towards the interior (63) of the nozzle beam (59), in the nozzle connection (60) or nozzle head (64) and, in the closed position (11') of the spray nozzle (11), is closed by the wall (75) of the nozzle connection (60) or nozzle head (64), and also an adjustment member (77) which engages on the end of the rotary slide (69) placed on the nozzle head (64).
2. Cold strip rolling mill according to claim 1, characterised by adaptors (17), which are fitted at both ends (15, 16) of the individual nozzle beams (7, 8), for rotatable and displaceable mounting of the nozzle beams (7, 8) about and in the direction of the beam longitudinal axis (13 - 13) on two hollow bearing pins (18, 19) which are incorporated in lateral plates (20, 21) on both roll housings of a roll stand (1), the supply of the cooling agent or of the emulsions to the spray nozzles (11) incorporated in the nozzle beams (7, 8) and to the associated control valves (12) being effected through a supply line (22) in one lateral plate (20) or both lateral plates (20, 21), the cavity (23) of the bearing pin (18) incorporated in the lateral plate (20), the interior (24) of the adaptor (17) sitting on the bearing pin (18) and the distributor channel (25) of the nozzle beams (7, 8), adjustment cylinders (26, 27), which are disposed on both bearing pins (18, 19) of the individual nozzle beams (7, 8), with adjustment pistons (28), which engage on the adaptors (17), for displacement of the nozzle beams (7, 8) transversely relative to the direction of movement (a) of the roll strip (6) and also a rotary drive (29), which engages on an adaptor (17) of the individual nozzle beams (7, 8), for pivoting the nozzle beams (7, 8) about their longitudinal axis (13 - 13).
3. Cold strip rolling mill according to claim 1 and 2, characterised by walking beams (43), which are disposed on the strip inlet side on both roll housings (42) of a roll stand (1) and are moveable in the vertical direction (e, f), and also slides (44), which are moveable on said walking beams in the horizontal direction (g, h), with bearing arms (45) for the nozzle beams (7, 8, 10).
4. Cold strip rolling mill according to one of the claims 1 to 3, characterised in that, in the case of a four-high stand (1), there are mounted respectively at least one nozzle beam (7, 8) for the lower and the upper work roll (2, 3) on the lower ends (46) of the bearing arms (45), and also at least one nozzle beam (10) and a scraper (48) for the upper support roll (5) on the upper portions (47) of the bearing arms (45).

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