EP2408594B1 - Device for grinding a continuous casting product - Google Patents

Description

The invention relates to a device for grinding a continuous casting product, in particular a slab, wherein the continuous casting product in cross section has a rectangular contour with two opposite long sides and two opposite short sides, wherein the device comprises a grinding device with at least one grinding tool for grinding at least one long Side of the continuous casting product, wherein the grinding device comprises a support arm which is pivotally mounted in a pivot axis on a support member of the grinding device, wherein the grinding tool is arranged at a spaced from the pivot axis location of the support arm and wherein for pivoting the support arm relative to the support member, an actuator is effectively disposed between the support member and the support arm.

Continuously cast products, in particular slabs, are usually subjected to surface treatment by grinding after the continuous casting in order to achieve a sufficient quality in the further processing of the product. In the case of continuous casting slabs, the slab is usually reciprocated in the longitudinal direction in a reversing motion under a grinding device (grinding aggregate). At the end of each reversing movement, the grinder performs a stepwise cross-feed motion until the entire slab surface is ground.

During grinding, the slab is stored on a grinding table lying on its long side or broad side.

A grinding device of the type mentioned is by the EP 0 109 687 A2 known. For grinding the long and short side of the continuous casting product, the support arm having the driven grinding tool is connected, on the one hand, to an actuator mounted to be pivotably mounted on the mill floor and, on the other hand, to a pivot arm provided in parallelogram configuration with the actuator. At the swivel arm attacks a movably mounted, supported on the hut floor further separate actuator.

Another known device for grinding slabs is in the FIGS. 1 to 3 shown. It is similar to the one in the EP 0 053 274 A1 is described.

On the device after Fig. 1 the so-called. HP grinding (high-pressure grinding) of the slab 1 is performed. The device has a grinding table 6 and a grinding device 21 in the form of a main assembly with drive motor and grinding wheel 7. The slab 1 has in a known manner two long sides 2 and 3 (broad sides) and two short sides 4 and 5 (narrow sides). It lies with one of its long sides 3 on the grinding table 6. When grinding the top of the slab, the grinding table 6 reversibly moves under the grinding device 21 in the direction perpendicular to the plane of the drawing. In this case, the grinding wheel 7 is pressed by means of a grinding pressure cylinder 14 'against the upper side of the slab 1. The slab 1 is thus moved by means of the grinding table 6 relative to the grinding device 21 in the longitudinal direction back and forth. With each reversing the grinding device 21 performs a step by step by means of a feed cylinder 22 Cross feeding movement until the top of the slab is finished.

It is necessary, depending on the quality requirements in addition to the long slab sides 2, 3 and the short slab sides 4, 5 to grind. Therefore, in addition to the grinding device 21, so the main unit, for grinding the long side 2, 3 of the slab 1 is still a second grinding device 23 in the form of an accessory present, which is intended to grind the short sides 4, 5 of the slab 1 , For this purpose, a grinding wheel 7 is available.

After the overhead long side 2 of the slab has been ground by the main unit 21, a short side 5 of the slab 1 is ground by means of the auxiliary unit 23.

In the Figures 2 or 3, the main unit 21 and the auxiliary unit 23 are shown, wherein the movement of the grinding wheel 7 during grinding, ie the respective delivery is indicated by the units 21, 23 insofar as that the grinding wheel including grinding spindle outlined in two different positions is. The effort associated with the additional installation of an accessory is relatively high.

A problem is also that it can lead to significant caking of grinding chips on the device, if the flight of chips during grinding is not optimally maintained. Therefore, a relatively high maintenance is required in previously known solutions.

The invention is therefore an object of the invention to provide a generic device that allows other means with high quality manufacturing, the processing of the continuous casting product. Furthermore, it should be achieved that the grinding of the continuous casting product can be carried out in an efficient and rapid manner, so that the grinding can be carried out economically. Furthermore, the aim is to make the device so that a removal of the grinding chips can be done in an improved manner. As a result, in particular caking chips are to be reduced to the device.

This object is achieved by the features stated in the characterizing part of the independent claim.

In addition to the long side, preferably only a single short side of the surface treatment is subjected to a progressive grinding process in the processing position. The direction of rotation of the grinding tool is particularly preferably kept the same during the surface processing of the long and the short side. This leads to an advantageous chip removal. The direction of rotation of the Schleifwerkzeus in the surface processing of the long and the short side is namely chosen with advantage so that the chips flight in the surface treatment is directed horizontally to the side or vertically downwards.

The long side of the continuous casting product is usually at least twice as long as the short side of the continuous casting product and is a multiple of this in slabs.

At least one of the partial actuators, preferably both partial actuators, are preferably designed as hydraulic or pneumatic piston-cylinder systems. The grinding tool is preferably arranged at the end of the holding arm, which is remote from the pivot axis. The actuator advantageously engages near the grinding tool on the holding arm.

The grinding tool can be covered by a protective hood over part of its circumference, wherein the protective hood is rotatably mounted about an axis of rotation which is parallel to the axis of rotation of the grinding tool. An actuator can be effectively arranged between a circumferential point of the protective hood and the holding arm. This actuator is preferably designed as a pneumatic or hydraulic piston-cylinder system. The guard may be disposed on a pivot arm, wherein the pivot arm is mounted in the support arm and can be pivoted about a pivot axis which is parallel to the axis of rotation of the grinding tool and spaced therefrom. Provided may be that an actuator for pivoting the pivot arm is arranged to be effective relative to the support arm between the pivot arm and the support arm, which makes the grinding wheel change easier.

With the proposal according to the invention, a high product quality can be achieved while still relying on a separate grinding unit, d. H. on the accessory for grinding the short side, and can be dispensed with another separate actuator.

The proposed in the proposed solution a grinding device has therefore been modified so that it is also suitable for grinding the short side of the continuous casting product. In this case, care must be taken that the cylinder stroke of the grinding pressure cylinder is substantially larger than in the prior art device, since the grinding wheel must be made correspondingly lower due to the radius of the worn grinding wheel and the product thickness to completely grind the short side (narrow side) can.

However, a pure Huberhöhung a single piston-cylinder system due to the thereby increasing oil column in the cylinder would affect the control behavior of the grinding unit very strong negative. As a result, a reliable grinding would not be guaranteed. To solve this problem, the device according to the invention provides two series-connected partial actuators, of which only one serves to regulate the pressing force; the other is a pure Stellaktuator, which must take only two end positions. This other sub-actuator takes a first position for grinding a long side of the slab when the piston is retracted and a second position for grinding a short side of the slab when the piston is extended.

Furthermore, the grinding wheel guard has been modified so that it does not hit the long side when grinding the short side.

Thus, with the proposed device and procedure, it is possible to efficiently and quickly and precisely grind both a long and a short side. A separate ancillary unit can thus be dispensed with without sacrificing quality.

For grinding a slab, it is stored horizontally on a long side (broad side) on the grinding table. First, the long side is ground in the usual way. Afterwards (or before) the short side (narrow side) becomes laterally ground. The advantage is that the direction of movement of the chips does not change if the direction of rotation of the grinding wheel is maintained and only one chip collecting box must be installed. The chip collecting box only needs to be extended to the grinding table. The direction of rotation of the grinding wheel does not change during machining.

Fig. 1

eine Vorrichtung zum Schleifen eines Stranggussprodukts in Form einer Bramme gemäß dem Stand der Technik;

Fig. 2

das Haupt-Schleifaggregat der Vorrichtung gemäß Fig. 1;

Fig. 3

das Neben-Schleifaggregat der Vorrichtung gemäß Fig. 1;

Fig. 4

schematisch das Schleifen eines Stranggussprodukts mit einem Schleifverfahren gemäß der Erfindung;

Fig. 5

in perspektivischer Darstellung eine erfindungsgemäße Schleifvorrichtung während des Schleifens der oberen langen Seite der Bramme;

Fig. 6

die Vorrichtung gemäß Fig. 5 während des Schleifens einer kurzen Seite der Bramme;

Fig. 7

die Vorrichtung gemäß Fig. 5 mit verschlissener Schleifscheibe unmittelbar vor dem Auswechseln der Schleifscheibe; und

Fig. 8

die Vorrichtung gemäß Fig. 7 mit einer neuen montierten Schleifscheibe.

In the drawing, embodiments of the invention are shown with a slab as Strangussprodukt. Show it:

Fig. 1

a device for grinding a continuous casting product in the form of a slab according to the prior art;

Fig. 2

the main grinding unit of the device according to Fig. 1 ;

Fig. 3

the sub-grinding unit of the device according to Fig. 1 ;

Fig. 4

schematically the grinding of a continuous casting product with a grinding method according to the invention;

Fig. 5

a perspective view of a grinding device according to the invention during the grinding of the upper long side of the slab;

Fig. 6

the device according to Fig. 5 while grinding a short side of the slab;

Fig. 7

the device according to Fig. 5 with worn grinding wheel immediately before replacing the grinding wheel; and

Fig. 8

the device according to Fig. 7 with a new mounted grinding wheel.

In Fig. 4 schematically a device for grinding a slab 1 is shown, which operates according to the invention. The slab 1 has a rectangular cross-section which is in Fig. 4 you can see; the slab 1 extends with its longitudinal axis in the direction perpendicular to the plane of the drawing. The slab 1 accordingly has two long sides 2 and 3 (broad sides) and two short sides 4 and 5 (narrow sides).

The slab 1 lies with its lower long side 3 on a grinding table 6. This processing position of the slab 1 is marked with A, during the process according to the invention, the slab 1 remains in the processing position A. After carrying out the process, the slab is turned by 180 ° about the longitudinal axis and the process is repeated.

The slab surface is processed here by means of a grinding process in order finally to be able to produce a product of sufficient quality from the slab. For this purpose, a grinding device is provided, from the in Fig. 4 only the grinding wheel 7 is sketched. The arrow 8 indicates the direction of rotation of the grinding tool (grinding wheel) 7 during its operation.

First, the grinding wheel 7 is guided in a known manner in the horizontal direction transverse to the longitudinal axis of the slab to grind the overhead long side 2. It is essential that after (or possibly before) the grinding of the long side 2 of the slab 1 in the processing position A with the same grinding wheel in a continuously continuous operation 7 one of the short sides 4 is subjected to a surface treatment.

The grinding is carried out in a manner known per se, i. H. the grinding table 6 reciprocates in the direction of the longitudinal axis of the slab 1 (i.e., in the direction perpendicular to the drawing plane), while the grinding wheel 7 is advanced a certain amount across the width direction of the slab 1 at each stroke of the grinding table 6.

The direction of rotation 8 of the grinding wheel 7 causes the grinding chips on the slab surface during grinding of the long side 3 are directed horizontally (to the left), which is indicated by the chips 9. Meanwhile, when sanding the short side 4, the chips are directed downwards (chip flight 9), where there is an unillustrated chip collecting box. Chip migration can be influenced by a baffle plate 24.

In the execution of the Fig. 5 to 8 the grinding device is modified so that both the grinding of the upper long side 2 and the grinding of the left short side 4 is possible. On a separate accessory can thus be dispensed with. For this purpose, both directions of movement of the grinding unit are equipped with a grinding pressure control.

The grinding device 10 according to Fig. 5 allows such a grinding process. On a base frame 25, according to Fig. 1 can be moved horizontally by means of the feed cylinder 22, a support member 13 is attached. The carrier element 13 has a pivot axis 12, in which a holding arm 11 is articulated, so that it can pivot about the pivot axis 12 relative to the carrier element 13. The holding arm 11 carries at its one end a grinding spindle with the grinding wheel 7, which rotates about its axis of rotation 17.

For the delivery of the grinding wheel 7 and for applying a defined pressure force an actuator 14 between the support member 13 and the support arm 11 is arranged effectively.

It is essential that the actuator 14 consists of two partial actuators 14 'and 14 "which are connected in series The partial actuator 14' corresponds to the usual grinding pressure cylinder with the usual stroke, as in the prior art Fig. 1 is present and provided with the reference numeral 14 '. He performs a defined displacement s (s. Fig. 5 ). The second Teilaktuator 14 "is, however, a non-controllable actuator, but one which can be moved only in two positions and held in this.

The first position that the subactuator 14 "occupies is in Fig. 5 and is selected when a long side 2 of the slab 1 is to be ground.

The other position that the subactuator 14 "occupies is in Fig. 6 is shown and is then used when the short side 4 of the slab 1 is to be ground. To keep the stroke of the adjustable grinding pressure cylinder (Teilaktuator 14 ') short, is used in its line of action, the second Teilaktuator 14 "having only the two positions: piston fully retracted for grinding the long side 2 and piston fully extended for grinding the short Page 4.

The second Teilaktuator 14 "is acted upon in its respective end positions with maximum operating pressure, so that it has the property of a rigid spacer.

As further in the FIGS. 5 to 8 can be seen, the grinding wheel 7 is partially covered by a protective hood 15, namely over part of its circumference. The protective hood 15 is rotatably mounted about an axis of rotation 16 which is parallel to the axis of rotation 17 of the grinding wheel 7.

At an circumferential point of the protective hood 15, an actuator 18 engages, which is hinged at its other end to the support arm 11. By operation of the actuator 18, accordingly, the protective cover 15 can be rotated. In the position after Fig. 5 it is positioned for the sanding of the long side 2. If the short side 4 is ground, which is in Fig. 6 is sketched, the protective cover 15 is brought into a pivoted back position, so that there can be no collision between the guard 15 and slab 1.

The protective cover 15 is thus rotatably mounted such that it can be rotated accordingly for the main or secondary side grinding.

The protective hood 15 is arranged at one end of a pivoting arm 19, which is articulated with its other end on the holding arm 11. Thus, the protective cover 15 together with pivot arm 19 about a pivot axis 20, which is parallel to the axis of rotation 17 of the grinding wheel 7, are pivoted. This is used for grinding wheel change.

For the grinding wheel change in the FIGS. 7 and 8th is shown, the guard 15 can be pivoted completely manually or via an actuator (not shown) upwards. The worn grinding wheel 7 is freely accessible and can according to Fig. 7 against a new grinding wheel 7 according to Fig. 8 be replaced.

As already mentioned, the feed cylinder 22 is used for the horizontal feed of the grinding wheel 7. When the feed cylinder 22, the grinding unit 10 z. B. in the direction of slab 1, the grinding wheel 7 is pulled to a lower position by the actuator 14 via the pivot axis 12 to the short side 4.

The slab 1 thus processed may be a hot slab.

Since ultimately only the relative movement between the slab and the grinding wheel is important, it can also be provided as an alternative to the described procedure that the slab is arranged on a stationary mount and the grinding device 10 moves in the direction of the longitudinal axis of the slab during grinding.

LIST OF REFERENCE NUMBERS

1

Continuous casting product (slab)

2

long page

3

long page

4

short page

5

short page

6

grinding table

7

grinding tool

8th

direction of rotation

9

flying chips

10 -

grinder

11

holding arm

12

swivel axis

13

support element

14

actuator

14 '

Partial actuator (grinding pressure cylinder)

14 "

Teilaktuator

15

guard

16

Rotary axis of the protective hood

17

Rotary axis of the grinding tool

18

actuator

19

swivel arm

20

swivel axis

21

Grinding device (main unit)

22

feed cylinder

23

second grinding device (accessory)

24

baffle

25

base frame

A

processing position

s

Versteiiweg

Claims (9)

1. A device for grinding a continuous casting product (1), particularly a slab, wherein the continuous casting product (1) has a rectangular cross-sectional contour with two opposing long sides (2, 3) and two opposing short sides (4, 5), wherein the device features a grinding device (10) with at least one grinding tool (7) for grinding at least one long side (2, 3) of the continuous casting product (1), wherein the grinding device (10) comprises a holding arm (11) that is pivotably arranged in a pivoting axis (12) on a carrier element (13) of the grinding device (10), wherein the grinding tool (7) is arranged at a location of the holding arm (11) that is spaced apart from the pivoting axis (12), and wherein an actuator (14) is effectively arranged between the carrier element (13) and the holding arm (11) in order to pivot the holding arm (11) relative to the carrier element (13),
   characterized in
   that the actuator (14) consists of two sub-actuators (14', 14") that are connected in series, wherein one of the sub-actuators (14') is realized in the form of an element that can be controlled or regulated with respect to its adjustment travel (s) and/or its actuating power and the other sub-actuator (14") is realized in the form of an element that can only be positioned in two end positions, and wherein this other sub-actuator (14") assumes a first position, in which the piston is retracted, in order to grind a long side (2) of the continuous casting product and a second position, in which the piston is extended, in order to grind a short side (4) of the continuous casting product.
2. The device according to Claim 1,
   characterized in
   that at least one of the sub-actuators (14', 14"), preferably both sub-actuators (14', 14"), are realized in the form of hydraulic or pneumatic piston-cylinder systems.
3. The device according to Claim 1 or 2,
   characterized in
   that the grinding tool (7) is arranged on the distant end of the holding arm (11) referred to the pivoting axis (12).
4. The device according to one of Claims 1 to 3,
   characterized in
   that the actuator (14) engages on the holding arm (11) near the grinding tool (7).
5. The device according to one of Claims 1 to 4,
   characterized in
   that the grinding tool (7) is covered by a protective hood (15) over part of its circumference, wherein the protective hood (15) is rotatably supported about a rotational axis (16) that extends parallel to the rotational axis (17) of the grinding tool (7).
6. The device according to Claim 5,
   characterized in
   that an actuator (18) is effectively arranged between a point on the circumference of the protective hood (15) and the holding arm (11).
7. The device according to Claim 6, characterized in that the actuator (18) is realized in the form of a pneumatic or hydraulic piston-cylinder system.
8. The device according to one of Claims 5 to 7,
   characterized in
   that the protective hood (15) is arranged on a pivot arm (19), wherein the pivot arm (19) is supported in the holding arm (11) and can be pivoted about a pivoting axis (20) that extends parallel to and is spaced apart from the rotational axis (17) of the grinding tool (7).
9. The device according to Claim 8,
   characterized in
   that an actuator is effectively arranged between the pivot arm (19) and the holding arm (11) in order to pivot the pivot arm (19) relative to the holding arm (11).

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