DE19602004A1 - Cold rolling mill for thin and foil strip - Google Patents

Abstract

Cold rolling mill for thin and foil strip has at least one four-roll stand (1), at least one wind-off reel (6) and at least one wind-up reel (8). It is characterised by a horizontal arrangement of the rolls (12, 13; 16, 17), horizontal application of the screw-down forces (F) and the bending forces (FB) to the ends of the rolls; a vertical passage (a) of the rolled strip (9) through the rolling gap (18) between rolls (12, 13), and an arrangement of the multi-roll stand, wind-off reel and wind-up reel in respective planes (2-2, 5-5, 7-7) of a building (37) or framework which lie one above the other. The working rolls (12, 13) and/or backing rolls can be shifted axially to match strip width. Two wind-off and wind-up reels are provided for pack rolling, esp. double rolling thin and foil strip. Oil or emulsion coolant and lubricant is supplied from boxes (23) and chambers (40). A catch-pan (24) is located beneath the rolls. A trolley (27) with saddle pairs (28, 29) operates in the upper plane (5-5) and transports coils (30) from a high-rack store (31) to the wind-off reel and takes away empty spools (21) to a hoist (33). A similar trolley (27) operates in the lower plane (7-7) for the wind-up reels.

Description

In the conventional rolling mills for fine and Foil tape according to DE 35 25 038 C2, with at least a rolling stand with vertically arranged support and Work rolls and at least one decoiler and are equipped with at least one take-up reel Contact forces for generating the rolling force and the bending forces to compensate for the roll bending and to regulate the Roll gap in the vertical direction in the roll neck initiated and runs the tape in the horizontal direction the roll gap between the work rolls.

Due to the vertical arrangement of the support and Work rolls in a roll stand with two roll stands that with a closed frame to support the Adjusting forces are provided for the rolling of fine and foil tape no favorable working conditions.

With the conventional fine and foil strip rolling mills closed roller stands are the contact surfaces of the Roller chocks are not always clearly defined. Because of the required installation game it comes when initiating the Rolling moment to tilt the roll chocks and different moments of friction when the rollers are fed. The Regulation of the positioning forces and the bending forces as well as the Balancing of the rollers is due to the asymmetrical Force and deflection relationships, which are the lower and upper work and back-up rolls due to a roll stand the weight of the rollers, very expensive. The uneven thermal load on the roll stands due to the the upper rolling oil running down to the lower rollers and the rising heat give rise to asymmetries in the thermal Balance of the scaffold, which acts as a disturbance variable in the regulation of the Adjusting forces and the bending forces must be taken into account.  

The uneven thermal load on top and The underside of the rolled strip adversely affects the Surface quality of the belt. Pulling the From the decoiler and threading the tape, in particular a doubled band or a band to be doubled, into the roll gap and the transport of the strip from the roll gap to Rewinder by mechanical and / or pneumatic Conveying devices such as guide rollers and air guide tables is very expensive. In addition, the unraveling of doubled film in the usual rolling mill arrangement only very much difficult to implement. Serving and serving the coils and the empty reels to and from the unwinder and reel can only take several time and labor intensive Operating steps are carried out. The poor accessibility of the Roll stands, the oil drip pans, the strip thickness gauges and the Strip flatness measuring rolls cause considerable difficulties cleaning of the rolling mill from strip remnants and maintenance of the various parts of the system and the measuring devices. The measurement the strip thickness, which is as close as possible in the strip running direction the roll gap is to take place requires a corresponding one Positioning of the strip thickness measuring device with complex Devices behind the roll gap. The quality of top and Underside of the rolled strip is different due to the thermal stress due to the necessary Tape guide rollers impaired. Also one Displacement of the support and / or work rolls according to the respective bandwidth through the guide in the stand window Set limits.

The invention has for its object a Rolling mill construction as a duo, quarto and multi-roll stand, in particular a four-high mill for fine and foil strips to develop the disadvantages listed above conventional fine and foil strip rolling mills avoided.

This object is achieved by a Cold rolling mill for fine and foil strip, the at least one  Multi-roll stand and at least one unwinding and has at least one take-up reel for the rolled strip and by a horizontal arrangement of the rollers, a horizontal introduction of the contact and bending forces in the roll ends, a vertical pass of the rolled strip through the nip between the work rolls as well as a Arrangement of the multi-roll stand or the multi-roll stands, the decoiler and the decoiler in superimposed levels of a building or one Distinguished scaffolding.

Such a rolling mill construction stands out compared to the conventional rolling mills by the below listed benefits from:

The rolling strip is threaded into the roll gap by gravity, if necessary with an air support and / or through support by means of baffles without one Manipulating the tape. By using gravity the threading process is particularly important when double Foil tape significantly simplified. When rolling a double Film tape results from the vertical tape guide the further advantage that before the arrival of two Unwinding reels of foil strips running into the nip Contact areas of the two tapes very easily with one Release agents can be sprayed. There is also a Unwrapping, dividing and trimming double foil easily possible with two reel units. A Weight balancing of the top rollers is not necessary. The employment and the deflection of the working and the Back-up rolls, which are in the same designed chocks in the two roll stands or trestles on a roll stand are rotatably mounted, symmetrical to the vertical Belt run level or passline are formed with Positioning and bending forces by position-controlled positioning and Bending cylinders are applied. Through a hydrostatic Support of the roll components of the horizontally arranged  Rolls on a horizontal guide surface result clearly defined contact surfaces and minimal friction, whereby the resulting from the thermal expansion of the rollers "Stick-slip effect" is prevented, especially in the long coil run times occur in foil rolling mills.

The problem with conventional rolling mills the compensation of the roll grinding is not necessary because the rolls always on the center of the scaffold or the vertical belt running level can be set. By position control from Decoiler and take-up reel for continuous adjustment of the The point of unwinding of the tape from the unwinding spool and run-up point of the run-up on the take-up reel Belt at the level of the vertical belt running level can be the belt without being guided by coil deflection and tensioning rollers Coil run through the nip so that the possibility offers the quality of the belt surfaces, in particular of fine and Foil tape over the contact length of the tape with the Affect work rolls. Favorably on the Surface quality especially of foil tape affects also from that the thermal loads on the rollers and accordingly, the entire belt surface are the same size. The speed control of decoiler and reel in Dependence on the continuously changing coil diameter compared to conventional cold strip, fine strip and foil rolling work easier. The feed of the decoiler with a coil and the removal of the empty coil from the Decoiler and loading of the decoiler with an empty spool and the coil is removed from the Rewinder can be done in one operation. In the case of an above-ground installation of the horizontally extending one The rolling stand can be compared to the conventional rolling mills the rolling oil running off with an underfloor installation of the oil pan comparatively easy in a one under the rolling stand across the hall arranged oil pan are collected, and the reservoir for fresh rolling oil as well as the feed tank to hold the Rolling oil from the drip pan can also be found in the hallway be set up. The roller cooling and lubrication device with  arranged directly above the rollers, to the roller surface open inlet boxes for zone-wise or complete flooding of the rolls across the roll width with a rolling oil or Rolling oil emulsion enables optimal cooling and lubrication the rollers. In the case of a required strip flatness regulation ensures the flatness measuring roller due to the constant Wrap angle of the rolled strip, which is determined by the vertical Belt guidance is made possible, error-free, zone by zone Measurement of the belt tension over the bandwidth. The Tape thickness measurement can be close with an easily accessible measuring device at the roll gap on the strip inlet and / or outlet side of the Roll stand take place. Because of the good accessibility All plant parts prepare the maintenance of the rolling mill and which in particular in the event of tape breaks to prevent the risk of fire required cleaning of the rolling mill from strip flakes and Tape residues that can be disposed of in the hallway, none at all Difficulties. The horizontal arrangement of the rollers in the Roller stands or trestles on a floor level Roll stand enables each roll to be dismantled individually Repair and maintenance purposes as well as when necessary Roller exchange. Finally, the new rolling mill stands out compared to the rolling mills according to the prior art by the Savings made possible due to the new rolling concept of different system parts through considerable price advantages out.

A cold strip rolling mill is known from US Pat. No. 2,237,794 Rolling of hot rolled strip material with an initial thickness from 9.5 to 12.7 millimeters to a final thickness of up to 0.254 millimeters known. The rolling mill consists of several in a housing encapsulated with rolling units horizontally arranged work rolls, the Rolling units are arranged in two vertical rows one of which is directed downwards from the rolled strip Roll direction and their other from the rolled strip with one after is passed through rolling direction directed above. Through this State of the art is the teaching according to the invention, a rolling mill  with horizontally arranged work rolls for rolling Fine and foil tape with a final thickness of 0.200 to 0.006 Millimeters and the horizontal Roller arrangement possible zone-wise cooling of the working and Back-up rolls by laminar application of a cooling and Lubricating oil on the rollers as an optimal manipulated variable for the Using band flatness control is not recommended.

The invention is based on schematic below Drawings explained. Show it

Fig. 1, a rolling mill for rolling fine and foil strip,

Fig. 2 is a roller cooling device in perspective and

Fig. 3 is a rolling mill for double rolling fine and film strip.

The main system parts of the fine and foil strip rolling mill shown in Fig. 1 are a four-high mill stand 1 installed in level 2-2 of a building 37 with two roller stands or support stands 3 , 4 , one in an upper level 5-5 above level 2-2 of Unwinding reel 6 housed in the building 37 and a winding reel 8 for the rolled strip 9 standing in a lower level 7-7 below the level 2-2 .

The two work rolls 12 , 13 rotatably mounted in the chocks 10 , 11 and the support rolls 16 , 17 rotatably mounted in the chocks 14 , 15 are arranged horizontally in the roll stand 1 , and the chocks 14 , 15 of the support rolls 16 , 17 are in the Roller stands or supported on the support stands 3 , 4 .

The contact forces F are introduced horizontally into the roll ends of the support rolls 16 , 17 and the bending forces F _B horizontally into the roll ends of the work rolls 12 , 13 , and the rolled strip 9 runs in the vertical direction a through the roll gap 18 between the work rolls 12 , 13 .

To reduce the frictional forces when the rollers are turned on, the chocks 10 , 11 of the work rolls 12 , 13 and the chocks 14 , 15 of the backup rolls 16 , 17 are supported hydrostatically on a horizontal guide 38 .

The four-high rolling mill 1 is equipped with pressure cylinders (not shown) for bending the work rolls 12 , 13 on the one hand in the strip running direction a in order to achieve a stretching of the rolled strip 9 in width, in order to thereby avoid wrinkling and on the other hand to counteract unevenness in the rolled strip 9 in the horizontal direction.

Work rolls 12 , 13 and support rolls 16 , 17 are axially displaceable to adapt to the bandwidth. This is made possible by the variable design of the horizontal guide 38 .

Decoiler 6 and decoiler 8 can be moved transversely to the belt running level 19-19 . By a position control of the decoiler 6 and the Aufwickelhaspels 8 of the run-off point are of the effluent of the coil 21 of the decoiler 6 rolled strip 9 and the winding point of the running onto the spool 21 of the Aufwickelhaspels 8 tape 9 continuously adjusted 20 22 at the level of the strip running plane 19-19.

The diameter of the coil 30 on the decoiler can be continuously derived from the vertical run of the rolled strip 9 from the decoiler 6 and the speed of the decoiler can be regulated as a function of the change in diameter of the coil.

The apparatus for cooling, lubrication and heating of the work rolls 12, 13 and the support rollers 16, 17 is made directly over the same is arranged, open to the rolling surface of the feed boxes 23 of FIG. 2 to the zone or complete flooding of the rollers 12, 13, 16, 17 with a rolling oil or rolling oil emulsion across the width of the roll. The inlet boxes 23 are divided by partitions 39 into chambers 40 with valve flaps, not shown, for flooding and closing the chambers. The adjustable partitions 39 of the inlet boxes 23 enable the width 41 of the chambers 40 of the inlet boxes 23 to be adjusted in accordance with the strip width and the cooling zone width as part of a strip flatness control.

The inlet boxes 23 ensure optimal lubrication and cooling of the rollers 12 , 13 , 16 , 17 by laminar application of an oil film on the rollers. This results in a maximum dwell time of the cooling oil film on the roller and thus a good peeling of the thermal bale of the roller. The fan-shaped chamber division of the inlet boxes enables zone-by-zone cooling and lubrication of the rollers. Such cooling of the rolls results in an optimal manipulated variable for the flatness control.

Under the rollers 12 , 13 ; 16 , 17 there is a collecting trough 24 for the rolling oil, which is integrated in the four-high rolling mill stand 1 on level 2-2 . On the level 2-2 there is also a reservoir 25 for fresh rolling oil and / or an inlet container 26 for receiving the rolling oil from the collecting trough 24 .

The fine and foil strip rolling mill is closed with a transport carriage 27 which can be moved in the plane 5-5 of the decoiler 6 with two pairs of saddles 28 , 29 for transporting a coil 30 from a storage 31 to the decoiler 6 and for transporting an empty spool 21 removed from the decoiler 6 Equipped with rails 32 , via which the spool 21 is taken over by a vertical elevator 33 , which transports the spool 21 to the level 7-7 below the building level, in which ( 7-7 ) another trolley 27 with two pairs of saddles 28 , 29 can be moved . The empty reels 21 conveyed by the vertical elevator 33 are transferred via guide rails 34 to the transport carriage 27 , which in each case drives a reel 21 to the take-up reel 8 and transports a coil 30 removed from the take-up reel 8 .

Under the oil pan 24 , a strip thickness measuring device 35 and a flatness measuring roller 36 are arranged at a short distance behind the roll gap 18 .

The fine and foil strip rolling mill shown in FIG. 3 for the double rolling of fine and foil strip 9 differs from the rolling mill according to FIG. 1 for rolling simple thin and foil strip in that it is equipped with two decoilers 6 and two decoilers 8 .

Reference list

1 four-high rolling mill
2-2 level of the rolling stand
3 roller stands or support frame
4 roller stands or support frame
5-5 upper Ebert
6 decoiler
7-7 lower level
8 take-up reel
9 rolled strip
10 work roll chock
11 work roll chock
12 work roll
13 work roll
14 backup roller chock
15 backup roller chock
16 backup roller
17 backup roller
18 roll gap
19-19 conveyor belt level
20 expiry point of 21
21 coils of 6 and 8
22 run-up point of 21
23 inlet box
24 oil drip pan
25 storage containers
26 inlet tank
27 dolly
28 pairs of saddles on 27
29 pairs of saddles on 27
30 coil
31 bearings of 30
32 tracks in 5-5
33 vertical elevator
34 track in 7-7
35 strip thickness measuring device
36 flatness measuring roller
37 buildings
38 horizontal guide for 10 , 11 ; 14 , 15
39 partition from 23
40 chamber of 23
41 width of 40
F positioning force
F _B bending force
a Direction of tape travel

Claims (16)

1. Cold rolling mill for fine and foil strip, which has at least one multi-roll stand (four-high roll stand 1) and at least one unwinding ( 6 ) and at least one take-up reel ( 8 ) for the rolled strip ( 9 ) and is characterized by a horizontal arrangement of the rolls ( 12 , 13 ; 16 , 17 ), a horizontal introduction of the contact forces (F) and the bending forces (F _B ) into the roller ends, a vertical passage (a) of the rolled strip ( 9 ) through the roll gap ( 18 ) between the work rolls ( 12 , 13 ) and an arrangement of the multi-roll stand ( 1 ) or the multi-roll stands, the decoiler ( 6 ) and the take-up reel ( 8 ) in superimposed levels ( 2-2 , 5-5 , 7-7 ) of a building ( 37 ) or a stand. 2. Rolling mill according to claim 1, characterized by a storage of the rolls ( 12 , 13 ; 16 , 17 ) in roll stands or support stands ( 3 , 4 ) which are integrated in an auxiliary or building construction. 3. Rolling mill according to claim 1 and 2, characterized by a hydrostatic support of the roll chocks ( 10 , 11 ; 14 , 15 ) on a horizontal guide ( 38 ). 4. Rolling mill according to one of claims 1 to 3, characterized by at least one four-high rolling mill ( 1 ) with two work rolls ( 12 , 13 ) and two backup rolls ( 16 , 17 ) and a device for bending the work rolls ( 12 , 13 ) in the horizontal direction and in the vertical running direction (a) of the rolled strip ( 9 ). 5. Rolling mill according to one of claims 1 to 4, characterized by an axial displacement of the work ( 12 , 13 ) and / or support rollers ( 16 , 17 ) to adapt to the strip width. 6. Rolling mill according to one of claims 1 to 5, characterized by a four-high rolling mill ( 1 ), which is set up in the middle level ( 2-2 ) of a building ( 37 ), one in an upper level ( 5-5 ) above the middle Level ( 2-2 ) of the building ( 37 ) accommodated decoiler ( 6 ) and a decoiler ( 8 ) for the rolled strip ( 9 ) standing on a lower level ( 7-7 ) below the middle level ( 2-2 ). 7. Rolling mill according to one of claims 1 to 6, characterized by a displaceability of unwinding ( 6 ) and winding reel ( 8 ) transversely to the strip running plane ( 19-19 ). 8. Rolling mill according to claim 7, characterized by a position control of unwinding ( 6 ) and take-up reel ( 8 ) for the continuous setting of the unwinding point ( 20 ) of the reel ( 21 ) of the unwinding reel ( 6 ) and the strip ( 9 ) and the overrun point ( 22 ) of the tape ( 9 ) running onto the spool ( 21 ) of the winding reel ( 8 ) at the level of the tape running plane ( 19-19 ). 9. Rolling mill according to one of claims 1 to 8, characterized by at least two unwinding ( 6 ) and two winding reels ( 8 ) for multiple rolling, in particular double rolling of fine and foil strip ( 9 ). 10. Rolling mill according to one of claims 1 to 9, characterized by devices for cooling, lubricating and heating the rolls ( 12 , 13 ; 16 , 17 ) with inlet boxes ( 23 ) arranged directly above them and open to the roll surface for zone-wise or complete flooding of the Rolling ( 12 , 13 ; 16 , 17 ) with a rolling oil or rolling oil emulsion across the width of the roll. 11. Rolling mill according to claim 10, characterized by a division of the inlet boxes ( 23 ) by partitions ( 39 ) in chambers ( 40 ) with valve flaps for flooding and closing the chambers ( 40 ). 12. Rolling mill according to claim 10 and 11, characterized by adjustable partitions ( 39 ) for adjusting the width ( 41 ) of the chambers ( 40 ) of the inlet boxes ( 23 ) according to the strip width and the cooling zone width as part of a strip flatness control. 13. Rolling mill according to one of claims 10 to 12, characterized by a collecting pan ( 24 ) arranged under the rolls ( 12 , 13 ; 16 , 17 ) for the rolling oil. 14. Rolling mill according to one of claims 10 to 13, characterized by the installation of a storage container ( 25 ) for fresh rolling oil and / or an inlet container ( 26 ) for receiving the rolling oil from the collecting trough ( 24 ) in the installation level ( 2-2 ) of Roll stand ( 1 ). 15. Rolling mill according to one of claims 1 to 14, characterized by a in the plane ( 5-5 ) of the decoiler ( 6 ) or the decoiler ( 6 ) movable transport carriage ( 27 ) with at least two pairs of saddles ( 28 , 29 ) for transport the coils ( 30 ) from a warehouse ( 31 ), in particular a high-bay warehouse to the decoiler ( 8 ) or to the decoiler ( 8 ) and for the removal of the empty reels ( 21 ) from the decoiler ( 6 ) or from the decoiler ( 6 ) to a vertical elevator ( 33 ) between the upper level ( 5-5 ) of the decoiler ( 6 ) or the decoiler ( 6 ) and the lower level ( 7-7 ) of the decoiler ( 8 ) or the decoiler ( 8 ) and one in the lower level ( 7-7 ) movable transport carriage ( 27 ) with at least two pairs of saddles ( 28 , 29 ) for transporting the reels ( 21 ) from the elevator ( 33 ) to the take-up reel ( 8 ) or to the take-up reel ( 8 ) and Removal of the coils ( 30 ) from the reel ( 8 ) or from the take-up reels ( 8 ). 16. Rolling mill according to claim 15, characterized by running rails ( 32 , 34 ) for conveying the empty reels ( 21 ) in the upper level ( 5-5 ) from the transport carriage ( 27 ) to the vertical elevator ( 33 ) and for transporting the reels ( 21 ) in the lower level ( 7-7 ) from the elevator ( 33 ) to the trolley ( 27 ).