DE10054749A1 - High speed shears for transverse cutting of rolled strip metal, has cutting drums driven by comb roll mechanism with different number teeth pairs - Google Patents

Abstract

The cutting drums (1, 2) are driven by a comb roll mechanism with a pairing of different numbers of teeth. The drums have different diameters and the blades or cutting edges on them only meet following a relatively large number of revolutions. A pair of drivers (10, 10) is located in front of and behind the shears. The shears, which are particularly suitable for cutting hot rolled strip metal, are formed by opposing rotating drums with blades or cutting edges, at least one of the drums being moved between a cutting or throughput position by an adjustment device.

Description

The invention relates to a high-speed shear for cross-cutting of rolling strip, in particular from rolled hot strip, lying opposite one another arranged on the drums, each having a cutting edge or cutting edge Knives with a feed speed of a roll to be divided transversely Bandes corresponding peripheral speed of a worm gear are drivable, with at least one drum a controllable Anstellvor direction in either a cutting position, or has a continuous position.

A high speed drum shear of the type described above is For example, known from DE-PS 475 512, in this knife are via a lever articulated on the drum and work with a sit firmly on the drum shaft the cam disc together in such a way that the blades no longer circle radially but parallel to each other and at right angles to the rolling stock, the rolling stock is usually like in a fixed pair of scissors vertical paper cut is cut off.

This drum shear is similar to a drum shear on a circle path running knife arrangement the formation of burrs in not satisfied is avoided, and so is the shearing off of the material to be cut Materials incomplete in some cases.  

U.S. Patent 5,207,138 describes a high speed shear for Cross-cutting of rolled strip material with an upper and a lower measurement sertrommel using hydraulic cylinders with an adj distance, then accelerate in rotation until the Rotational speed of the drum of the feed speed of the to be divided Corresponds to the rolled strip. Then the drums are relatively in the cutting position brought and cut the tape. The drums are over a branch supply gear driven by a motor, the transmission being an electronic has rotation position sensor, the on via a control device Adjustment movement of the two drums causes as soon as the knives come together kend cutting position are brought. The well-known scissors claimed for their Operation and the acceleration process a comparatively high effort on drive, transmission, transmission, control and adjustment elements and not least in energy.

Another well-known high-speed shear for cross cutting of rolling band is described in DE 198 09 813 A. The scissors are used for Achieve good cutting results at belt speeds up to 30 m / sec. with minimal strip thickness. A drum of scissors is like this on support elements stored that the support elements can be shortened to a cutting position. The Cutting tools are designed with a pairing as a chisel or anvil.

DE-OS 26 54 866 discloses a rotary drum shear for strand-shaped rolling Good. It has a drum rotating device with one of the two drums power transmission and a drive for the drums with such Ge speeds that the tangential speeds of the shear blades with the Running speed of the material are synchronized. The scissors have one Drum actuator with a second drive for adjusting a shear drum between an open pass position and a second Cutting position. It also has a control device for the engine  Actuating device which starts the shear in a first shear moment drum from the position to the cutting position, and the return to the ge opened position, whereby the positioning motor is brought to a standstill. The first and second shear drums have a diameter ratio of 2 to 3 on, such that three revolutions of the first drum on two revolutions the second drum is dispensed with and the drum setting device is controlled in such a way that the first drum after 6 revolutions, and the second drum meet after four revolutions for a cutting process.

For this, the transmission technology elements, control devices, drives are directions and actuating device associated with considerable effort. It is necessary especially for an extremely exact cutting position of the knives backlash-free gear elements when a smooth, burr-free cut of the belt should be enough.

Starting from the aforementioned prior art, the object of the invention a high-speed drum shear for rolled strip, in particular re for thin hot strip, indicating the difficulties mentioned above and overcomes technical limits, in particular a simplification the constructive effort for the synchronization of the drum with exact Position of the cutting knife in the cutting process guaranteed and a larger one Passage in the open position results.

The task is solved with a high-speed shear in Preamble of claim 1 type with the invention in that the Comb roller gear with a pairing of different numbers of teeth, and the Knife drums with correspondingly different diameters are formed that the cutting edges only after a comparatively larger one Number of revolutions to meet the cut, and that in front and behind a pair of drivers are arranged in the scissors.  

With this solution, the knife drums start up with great advantage to avoid the feed speed of the belt. With the before lying high belt speeds would namely for a drum revolution only a time of the order of milliseconds is available stand. An acceleration required for this would have a drive power of require several thousand Kw. It would also be a circuit design or knife actuation in such a short time with the required accuracy feasible. All these problems are solved with the Lö according to the invention solution avoided.

This allows him to flexibly interpret the operating data of the scissors be enough that the ratios of the speeds of the scissors drive and the drum diameter can be set variably at standstill. At a preferred embodiment, the diameter of the lower drum can be constant left, while the top drum diameter by radial adjustment tion of the knife is changed by clamping in the drum body. A change tion of the drum speeds can, for example, via a manual transmission or Single drive with variable speed, e.g. B. DC motors for under- or upper drum can be reached.

This allows the speed ratio of the drums to be changed within limits, for example from 38:40 to 30:50.

In the present case, this can be in a realistic embodiment Ratio of the number of teeth of the worm gear such as 40 to 38, and that Diameter ratio of the drums, for example, behave as 508 mm to 535 mm. When the scissors are placed in the open position or in the closed position is the time available to operate the job lung, the knife of the scissors drum due to the selected sub  Differences in the number of teeth of the gearbox, for example, only once in 40 revolutions meet each other in order to be able to make a cut, each 38: 2 = 19 turns the drum with a diameter of 535 mm or 20 revolutions of the drum mel with 508 mm diameter. The cut is then made with a conveyor speed of the rolled strip of 19 m / sec. and at 0 to 19 or 20 revs the drum within 1.68 sec.

An embodiment of the scissors according to the invention further provides that the Coverage of the knife cutting edges when cutting is approx. 1 mm. Further Embodiments of the high-speed shears according to the invention are ent provided for the subclaims.

Details, features and advantages of the invention will emerge from the next Explanation of an embodiment shown schematically in the drawings approximately example. Show it:

Fig. 1 in side view and partly in section of the high-speed shearing machine according to the invention,

Fig. 2 in side view and partly in section an alternative embodiment of the high speed shear,

3 is a view along the conveying direction of the high-speed shear including engine, transmission and drive members for the scissors.

Fig. 4 is viewed in the conveying direction, a driver gear, engine and drive members for the driver;

Fig. 5 is a partial view of the two blade drums at a distance depending on a Trom melumdrehung prior to its cutting position,

Fig. 6, the two blade drums of FIG. 5 at the time of the cut,

Fig. 7, the two blade drums in the opening position of the cut ent speaking angular position,

Fig. 8 different positions of the blades of the scissors

• a) corresponding to one revolution before the cut;
• b) the two knife drums of the scissors about a turn before Cut position,
• c) the two knife drums in the closed position at the moment of cut,
• d) the two knife drums of the scissors in the cutting position, but in ge open position.

Fig. 9 shows in the upper area a time-distance diagram of a knife drum before and after the middle cutting position, and in the lower area a time diagram with an associated rotation diagram for two drum diameters.

Fig. 10 cooperating in section as a pair of knife drums with a one direction to the change in diameter of the diameter of the upper drum,

Fig. 11 in side view, the radial adjustment of the diameter of the upper drum,

Fig. 12 is a side view of the scissors drive with two DC motors,

Fig. 13 in the section of the top roll includes means for hydraulic radial adjustment of the cutter bar,

Fig. 14 in section, a hydraulic clamping ring in the clamping pot of a pin on the cutter bar of the upper roller,

FIG. 15 is a sectional view of a switchable in the state four-speed transmission for the shear operation.

The high-speed shear 4 shown in FIG. 1 for cross-cutting, in particular of thinly rolled hot strip, comprises a co-operating pair with axes transverse to the strip running direction on opposite drums 1 , 2 , each having a cutting edge or cutting edge 8 , 8 ' Knives 7 , 7 'with a corresponding to the feed speed V ₁ egg nes to be divided roller belt 9 corresponding peripheral speed (in the present example with 19 m / s) from a comb roller gear 3 , at least one drum 1 a controllable setting device either in a Cutting position, or in a continuous position.

The worm gear 3 is with a pairing of different numbers of teeth, and the knife drums 1 , 2 are formed with correspondingly different diameters such that the cutting edges 8 , 8 'of the knives 7 , 7 ' each only after a comparatively large number of revolutions in the closed position tion to meet the cut, and that a pair of drivers 10 , 10 'are arranged in front of and behind the scissors 4 at the shortest possible intervals.

In the assumed example of 19 m / s feed speed of the hot strip and corresponding peripheral speed of the knife drums 1 , 2 , the ratio of the number of teeth behaves, for example, like 40 to 38, and the corresponding diameter ratio of the drums, for example, like 508 mm to 535 mm. The knives 7 , 7 'describe with their cutting edges 8 , 8 ' a circle which is each larger by about 10 mm in diameter than the diameter of the drums 1 , 2 . The drums are set so that there is an overlap 20 of the knife cutting edges 8 , 8 'when cutting about 1 mm.

In the high-speed cutter 4 in the design according to the invention, the drums 1 and 2 of the cutter 4 with the two drivers 10, 10 'below a they cross, for the adjustment of the upper knife drum 1 and the two driver pairs 10, 10' intended rocker 11 arranged to form a compact unit, as shown in FIG. 1.

This type of scissors shows that the upper knife drum 1 with its drive shaft is mounted directly on the rocker 11 , with the driver pairs 10 , 10 'in pendulum bearings 12 , 12 ' on horizontal links 13 , 13 'and with approximately vertical pendulum supports 14 , 14 'are arranged such that they can be supported against the rocker 11 .

The scissor design according to the invention further provides that the rocker 11 , from above the assembly of the scissors 4 and the driver pairs 10 , 10 ', crosses in the running direction of the tape at the outlet end with a vertical support leg 15 on the frame of the roller table 16 in a bearing Drivers 10 , 10 'parallel axis is mounted, and articulated at the inlet end with a pendulum, verti cal, double-acting hydraulic cylinder 17 and this is anchored at the lower end with a pivot bearing 18 on the roller table.

Furthermore, the high-speed shear shows that a carousel coiler 19 which can be lowered in the vertical direction is arranged at the outlet end of the scissor assembly.

In order to achieve a smooth, low-wear operation of the adjusting device, it is further provided that the hydraulic cylinder has 2 end position dampings, to summarize a spring hydraulic damping, which interact in terms of distance and force.

An alternative embodiment of the high-speed shear can be seen in FIG. 2. The drum shear with the inlet-side driver 10 is arranged below the cross-arm 11 '. The downstream driver 10 "is the Schwin ge 11 'downstream.

From Fig. 3 is the view of the drum diameter cutter 4 with the blade drums 1, 2 can be seen as well as the arrangement of the drive motor 5 and pinion gear 6, are driven by the means of the hinge spindles 21, 21 ', the respective knife drums 1, 2 having a differential rotation speed.

Fig. 4 shows the view of the driver 10 , the drive motor 5 'with gear 6 ' and articulated spindles 21 '.

In Figs. 5 to 7 in an enlarged scale is the position of the blades 7, 7 'of the blade drums 1, 2, once before the cut (Fig. 5), then at the moment of the cut (Fig. 6) and in the open Position ( Fig. 7), during which the hot strip passes freely through the scissors.

Fig. 8 shows in a time sequence (FIG. 8a-8c) the cutting operation and the open position of the knives 7, 7 '.

FIG. 9 shows a time-path diagram of the closing and opening position of the knife drums 1 , 2 with the cutting position of the plane xx and of the assignable times with seconds and assignable drum revolutions in the lower three scales.

In the upper scale, the drums make 6 revolutions between position points 100 and 101 in 0.5 seconds. Between the position points 101 and 104, the hydraulic cylinder 17 closes the scissors 4 in 0.84 seconds within 10 revolutions. Between the position points 101 and 102, the closing process of the scissors begins in 3.36 seconds with 4 revolutions at a stroke of 8 mm at a speed of 24 mm / s with an acceleration of 0.071 m / s ² .

The closing speed remains between the position points 102 and 103 constant. A stroke takes place in 0.168 seconds at approximately 2 revolutions of 4 mm. This is followed by between the position points 103 and 104 a further stroke of 8 mm, which results between points 104 and 108 results in a total stroke of 20 mm and in the delay line between points 103 and 104 in 0.336 seconds 4 revolutions of the measuring current run off. Thus, a total of 20 mm stroke in 0.84 seconds, i.e. H. 23.8 mm / s reached.  

When the two knife drums, each with 20 mm, have approached the cutting position, the rolled strip is cut in position xx. The knife drums are then moved back into the open position, the hydraulic cylinder 17 opening the scissors, and starting from position 105, position 106 is reached within 10 revolutions in 0.84 seconds reset time. After a further 0.5 seconds and 6 revolutions, the arithmetic starting position of point 100 is again reached in an opening and closing cycle of the two measuring drums 1 , 2 between position points 106 and 107.

The lower first scale contains a second indication, assigned to the flow diagram above it, and shows that an intersecting position of the interacting knife drums 1 , 2 is reached in 3, 36 seconds at 40 revolutions or 3.36 seconds at 38 revolutions. This means that the shortest part length of a rolled strip is 9 , 31.92 m, ie, approx. 32 m. For a longer or shorter part length, the comb roller drives of the drives for the scissors would have to be switched accordingly.

The advantage of the proposed solution is that you have enough time (in the example 0.84 s) to safely move the rocker 11 for the upper knife drum against the belt and make the cut, or to move the knife drum away again. In practice, this time of 0.84 s is easily accessible for the hydraulic control of the cutting cylinder 17 for actuating the rocker 11 .

The shown and described high-speed knife drum shears is ideal for a trouble-free operation with feeders speeds of a rolled strip in the thickness range between 1 and 3 mm and Feed speeds around 30 m / s.  

In addition to the above FIGS. 1 to 9 and their description, FIGS. 10 to 15 show tried and tested devices 23 to 25 for radially adjusting the knife 7 of the upper knife drum 1 at a standstill, with a knife-carrying knife bar 23 in a guide 24 on two supports oppositely adjustable wedges 25 , 25 '. The lower knife drum 2 , or an anvil drum, rotates with a constant diameter with the radius-adjustable upper drum 1 . Their knife has the reference number 7 '.

Fig. 11 shows the knife drums 1 and 2 in a view from the side, the same components of the drums 1 , 2 and their knife assemblies 7 , 7 'including the adjusting device 23-25 in the upper drum 1 in axial extension and installation recognizable are.

Fig. 12 shows a basic arrangement of the knife drums 1 and 2 in the open position and shows their drive situation by arranging separate DC motors 5 , 5 '- at least one DC motor - for the rotary drive of the two knife drums 1 and 2 with different speeds , The drive connection between the motor 5 of the upper drum 1 and 5 ′ of the lower knife drum 2 takes place in accordance with the exemplary embodiment shown via a cardan shaft 28 or clutch 27 .

An alternative embodiment of the knife adjustment in the upper drum 1 is shown in FIG. 13. The knife 7 is firmly embedded in the knife bar 23 . This is loosely supported on fitting pieces 28 , 28 'which are guided in hydraulically lockable clamping pots 29 , 29 '. The cutter bar 23 is articulated in a rocker guide 31 , 31 'and is at a standstill, hydraulic cylinders 30 , 30 ' in the radial position was set relative to the axis of rotation (xx) of the cutterhead 1 . Then the fitting pieces 28 , 28 'are traced and, after contact with the knife bar ( 23 ), are hydraulically fixed in the clamping pots 29 , 29 ' by clamping.

For this purpose, Fig. 14 shows the structure of a known per se clamping cup 29 in the section with a guided therein and clamped fitting 28 by means of a hy-hydraulically pressurizable clamping element 32. This rests on a hydraulic piston 33 and a set of disc springs 34 .

These are relieved by hydraulic pressure in the gap 35 by means of pressure oil to 36 .

Finally, FIG. 15 shows a four-speed manual transmission 37 which can be shifted at a standstill with dog clutches 38 to 40 . The input consists of the drive shaft 41 . The gear 37 has two output shafts 42 and 43 for driving the upper knife shaft 1 and driving the lower knife shaft 2 .

The manual transmission 37 can be switched in four stages, for example, in stages A to D.

This gives (purely by way of example) the conditions for the two scissor drives with the stages:

This means that, for example, four selectable cutting lengths can be set using the manual transmission 37 .

It is emphasized that the operating data chosen purely by way of example other operating data can be replaced, e.g. B. by other Ausle the gearbox or the number of teeth in the individual stages A to D.  

List of reference numbers

1

upper knife drum

2

lower knife drum

3

Comb roller gear for scissors

4

scissors

5

.

5

' Engine

6

.

6

'Pinion gear for drivers

7

.

7

' Knife

8th

.

8th

'Cutting edge

9

Rolled strip, hot strip

10

.

10

'Driver

11

wing

12

.

12

Storage

13

.

13

'horiz. handlebars

14

.

14

'' Pendulum supports

15

Swing arm support leg

16

roller table

17

Positioning cylinder for scissors

17

'' Positioning cylinder for drivers

10

17

"Positioning cylinder for drivers

10

'

18

pivot bearing

19

Karussellcoiler

20

Coverage of the knife edges

21

.

21

'' Joint spindle

22

Portal for drivers

10

22

'' Driver Portal

10

'

23

cutter bar

24

guide

25

.

25

'Wedges

Claims (9)

1. High-speed shears for cross-cutting of rolled strip, in particular of rolled hot strip, comprising knives ( 7 , 7 ') arranged on opposite drums ( 1 , 2 ), each having a cutting edge or cutting edge ( 8 , 8 '), with one of the feed speeds (V ₁ ) a transverse speed to be divided roller belt ( 9 ) corresponding peripheral speed of a worm gear can be driven, at least one drum ( 1 ) having a controllable adjusting device in either a cutting position or a through position, characterized in that the worm gear ( 3 ) with a pairing of different numbers, and the knife drums ( 1 , 2 ) are designed with different diameters in such a way that the cutting edges ( 8 , 8 ') meet each other only after a comparatively larger number of revolutions for the cut, and that before and a pair of drivers ( 10 , 10 ') are arranged behind the scissors ( 4 ). 2. High-speed shears according to claim 1, characterized, that the ratio of the number of teeth is like 40:38, and the diameter ratio changes, for example, like 508 mm: 535 mm holds.   3. High-speed shears according to claim 1 or 2, characterized in that the overlap ( 20 ) of the knife cutting edges ( 8 , 8 ') is approximately 1 mm during the cut. 4. High-speed scissors according to one or more of claims 1 to 3, characterized in that the drums ( 1 , 2 ) of the scissors ( 4 ) with the two drivers ( 10 , 10 ') below one overlapping them, for the employment of the upper knife drum ( 1 ) provided rocker ( 11 ) are arranged to form a compact unit. 5. High-speed shears according to one or more of claims 1 to 4, characterized in that the upper knife drum ( 1 ) with its drive shaft is mounted directly on the rocker ( 11 ), and that the driver pairs ( 10 , 10 ') in pen delbaren bearings ( 12 , 12 ') are mounted on horizontal links ( 13 , 13 ') and are supported with approximately vertical pendulum supports ( 14 , 14 ') against a portal ( 22 , 22 ') below the rocker arm ( 11 ). 6. High-speed shears according to one or more of claims 1 to 5, characterized in that the rocker ( 11 ), from above the assembly of the scissors ( 4 ) and the driver pairs ( 10 , 10 ') overlapping, in the tape running direction at the end on the outlet side mounted with a vertical support leg ( 15 ) on the frame of the roller table ( 16 ) in a bearing with an axis parallel to the drivers ( 10 , 10 '), and articulated at the inlet end with an oscillating vertical, double-acting hydraulic cylinder ( 17 ) and this is anchored at the lower end with a pivot bearing ( 18 ) on the roller table ( 16 ). 7. High-speed shears according to one or more of claims 1 to 6, characterized in that the hydraulic cylinder ( 17 ) for a quiet, low-wear run two end position damping, comprising a spring or hydraulic damping. 8. High-speed scissors according to one or more of claims 1 to 7, characterized in that the scissors ( 4 ) with the inlet-side driver ( 10 ) and the ablaufsei term driver ( 10 ") are arranged at the closest distance from each other. 9. High-speed scissors according to one or more of claims 1 to 8, characterized in that a carousel coiler ( 19 ) is arranged at the outlet end of the scissor assembly.