WO2011045036A1

WO2011045036A1 - Device and method for analyzing a metal strip

Info

Publication number: WO2011045036A1
Application number: PCT/EP2010/006250
Authority: WO
Inventors: Michael Degner; Karl Hoen; Volker Wahlen
Original assignee: Sms Siemag Ag
Priority date: 2009-10-13
Filing date: 2010-10-13
Publication date: 2011-04-21
Also published as: DE102009049106A1; DE102009049106B4

Abstract

The present invention relates to a device and method for analyzing a metal strip, wherein the strip (10) is guided by means of a decoiler (1), preferably horizontally, using a movable clamping device (3) and rails (5) to a deflecting roller (6). The strip (10) is deflected by the deflecting roller (6) and is subsequently transported away from the deflecting roller (6), for example toward a coiler, by means of a second movable clamping device (13). During the analysis of a section of the lower face of the metal strip upstream of the deflecting roller and/or of a section of the upper face of the metal strip downstream of the deflecting roller (6) with respect to the properties or surface quality thereof, the strip is preferably stationary.

Description

Apparatus and method for inspecting a metal strip

The present invention relates to a device and a method for examining a metal strip, in particular a cold strip.

Devices for the examination of cold rolled metal strips are known. In these devices, the end of the belt is cut off after being wound up on a coiler and then transported to a rotatable device. The examination of the tape is made possible by the adjustable rotational movement at different angles on the tape surface. Next, devices are known in which the end of the wound coil is transported vertically to a deflection roller. There, the end of the wound coil is inspected from both sides. The field of view of the band observer is partially limited due to the vertical arrangement of the examination system. For the investigation of larger tape sections, the unwinding of the tape is necessary until surface defects such as marks or whips can be seen by the observer. The belt surface can only be sanded in the immediate access area of the belt observer. From JP 6182444 A, a device for inspecting a metal strip is known, wherein the upper and the lower surface are examined in one pass.

From JP 4022513 A a device for the examination of a metal strip is known, whereby successive horizontal and vertical investigations of the metal strip take place.

CONFIRMATION COPY From EP 1 590 105 B1 an inspection system for rolled products of a rolling mill is known, wherein a number of height-adjustable rolled product clamps are arranged on a conveyor belt for rolled products. From EP 1 590 106 B1 an inspection system for rolled products of a rolling mill is known, in which a number of inspection tables and in the conveying direction of the rolled products a turning device is arranged, in which two receiving elements for rolled products pivotable about an aligned substantially parallel to the plane of extension of the rolled products axis of rotation are.

From DE 2 162 384 OS, a turntable with two parallel stationary axes oscillating groups of turning arms is known, provided in the vicinity of the Schenkachsen with support lugs for holding the sheets during the turning process and groups are driven by double acted hydraulic servo motors.

From DE 2 165 936 OS a turning device for slabs, sinkers, sheets, laminated cores and the like with a first pivot arm is known, of which the material to be turned lifted from a base and is pivoted substantially 90 ° upwards and a second pivot arm ü - is passed, from which the good pivoted by 90 ° and placed on a base. EP 1 824 619 B1 discloses a rolled strip inspection method wherein a tape specimen is inspected on a first side and then turned over to inspect a second side.

From WO 2004/060589 A1 is a method for rolling and subsequent reeling of metal strip, in particular of steel strip, on at least one rotationally driven, expandable coiler mandrel known, wherein the metal strip is examined in longitudinal sections on rolling anomalies.

WO 2007/107675 A1 discloses a device for testing a metal strip. The device consists of a vertical examination level between an unwinding device and a winding device. The examination is performed visually on both surfaces of the tape.

There are devices for the surface examination of cold tapes. These devices work in online mode and are predominantly camera-based. The evaluation of the recorded images takes place via neural network techniques. Disadvantages of these systems are that not every surface defect is found and so-called pseudo-errors are displayed. Pseudos errors are not really surface impairments, but are caused, inter alia, by unfavorable environmental influences in the area of the measuring field. The bands locked due to detected surface defects are rechecked in examination lines before the bands are sent. The cold-strip lines only have automatic surface-inspection systems in a few cases. The object of the present invention is to provide a device for testing a metal strip, in particular cold strip, with a simple structure.

The object of the present invention is achieved by a device for inspecting a metal strip with a top and bottom, comprising: at least one deflection roller for deflecting the metal strip,

a first movable clamping device for clamping and for moving the metal strip towards the deflection roller, and

a second movable clamping device for clamping and for moving the metal strip after its deflection by the deflection roller of the guide roller away. The term investigation in the sense of the present invention means a testing of the surface of the metal strip with regard to possibly existing surface defects or property defects on the bottom and / or top of the metal strip, hereinafter also referred to as strip.

Preferred embodiments of the invention will become apparent from the features of the subclaims.

It is proposed a device for the investigation of metal strip, in which the wound on an uncoiler end of the tape preferably transported horizontally by means of a first movable clamping device and rails under train to a guide roller, preferably deflected at the guide roller by 180 ° and subsequently with the aid of a second movable clamping device is transported back preferably in the direction of a Aufwickelhas- pel.

The preferably horizontal arrangement of the device is an easy-to-use and holistic examination of the tape top and belt underside given. The length of the device, in particular of the rails corresponds at least to the road length of a cold rolling mill. A cold rolling mill typically has a length of 15 m to 25 m, preferably about 20 m. Periodic errors can be found in the band well.

The advantages of the device according to the invention are in particular the simple structure. The examination does not cause any additional contamination of the tape. The device is only slightly soiled by the belt, since only the pulley has direct contact with the belt.

There is the possibility of sanding bands during tape tension testing. The strip tension, for example, by clamping the metal strip between the first and second clamping device with intermediate Circuit of the deflection roller and method of the two clamping device are constructed against each other. Alternatively, the strip tension can be constructed in the metal strip by suitable control of the unwinding and Aufwickelhaspels with the interposition of the deflection roller. Under strip tension, for example, a surface defect, such as whip marking, can be reliably detected in a weak form. The error Pinch Marks corresponds to linear markings on the belt which may occur singly or recur periodically and are not longitudinal to the rolling direction. The error is caused by unscheduled tape in the nip

Can cause wrinkles. If a whip leaves a mark on the surface of the roll, the error occurs periodically. Whip markings are no longer recognizable on the band in weak form with the naked eye. To identify the whip marking in practice, the grinding of the strip surface under train. The advantage of tensioning under tension is firstly that a flat band is obtained, as unevenness is pulled out through the device, and secondly, in effective grinding, since larger surfaces are possible. In unplanem band with wave crests and troughs only the mountains are sanded. Sanding tape sections means manually sanding the tape surface to view "hidden" surface defects, such as periodic streaks or shadows that are otherwise unrecognizable.

The device according to the invention requires lower investment costs and reduced costs for maintenance, since it contains only a few components. The device according to the invention allows easy handling during the examination.

The device according to the invention has the advantage that the metal strip, in particular cold strip, is optionally unwound for examination and optionally rewound after the examination. Cold strip production will be increases, since in the case of a defect-free tape, the return transfer of the end of the belt with the movable clamping device to the coiling of the cold rolling train without delay takes place. The device according to the invention does not require any scissors. There is therefore no sample scrap. The dispensing is increased overall and the components of the device are simplified. In prior art metal strip inspection apparatus, the end of the strip to be examined must be cut and transported to an appropriate inspection facility, which involves considerable time and material loss. The device according to the invention preferably enables a visual offline examination of the surface of metal strip in cold rolling mills by the human eye of a test person. The belt speed is preferably 0 m / s during the investigation. When using an inspection device, the belt speed may be higher than when examined by the inspector. In general, the speed of the metal strip during its examination may not be greater than the speed at which the examination is still possible.

Preferably, the first and second clamping devices are one and the same device. Further preferably, the one clamping device is designed to hold / clamp the metal strip also during its circulation around the deflection roller, d. H. the clamping device runs together with the metal band around the circulation roller. Particular examples of the invention provide, individually or in combination, that

The at least one deflection roller is, for example, a dancer roller, a working roller, a simple deflection roller or a belt storage roller; the apparatus comprises at least one stage accessible to the test person, hereinafter also referred to as an observer, for examining a portion of the underside of the metal band in front of the deflection roller and / or a portion of the upper side of the metal band behind the deflection roller with regard to its properties or its surface quality; the apparatus comprises inspection means for inspecting the top and / or bottom of the metal strip alternatively or in addition to the inspector; the device has lighting devices for illuminating the top and / or bottom of the metal strip; the device has running rails along which the first and second clamping devices can be moved with the metal strip; the rails are preferably arranged at least approximately horizontally for horizontal guiding of the metal strip on the guide roller and for horizontally guiding the metal strip away from the guide roller; the first and second clamping devices are designed to move the metal strip at such a low speed v that the metal strip can be inspected during the process or in the quiescent state; the deflection roller (6) deflects the metal strip (10) through an angle of 170 ° to 190 °, preferably by 180 °; it is the metal strip is cold strip; and / or upstream of the first clamping device in the transport direction of the metal strip, an unwinding reel for unwinding the metal strip and / or the second clamping device downstream of a rewinder for winding up the metal strip is arranged.

A further solution of the above-mentioned object lies in a method for examining a metal strip having an upper side and a lower side, wherein a) the metal strip is moved towards a deflection roller,

b) the metal strip is deflected by means of the deflection roller;

c) the metal strip is moved away from the deflection roller after its deflection; and

d) Subsequently, a portion of the underside of the metal strip in front of the deflection roller and / or a portion of the top of the metal strip behind the deflection roller is examined in terms of its properties or its surface quality.

The device according to one of claims 1 to 13 is designed for carrying out the method according to one of claims 14 to 16.

The advantages of the method and the use correspond to the advantages mentioned above with respect to the device.

The present invention will be explained in more detail by way of example with reference to a drawing. Show it:

Fig. 1 is a side view of a horizontal examination device with two walk-on stages, Fig. 2 is a side view of a horizontal examination device with a walk-stage and

Fig. 3 is a plan view of a horizontal examination device.

Fig. 1 and Fig. 2 show different embodiments of the device according to the invention, hereinafter also called examination device I and examination device II. The investigation of the metal strip 10, hereinafter also referred to as strip, proceeds, for example, as follows. A coil is driven along with its specific data, such as diameter, width and coil number with a coil car from a reel to the investigation device I, II. A coil is a coil of wound metal band.

The coil is driven on the coiler mandrel (not shown) of a decoiler 1. The collar beginning is rotated against the winding direction by 180 °. The movable first clamping device 3 is moved forward with a bundle opener 2. The coil is rotated forward and the beginning of the tape 10 is inserted into the first clamping device 3 and clamped there. As clamping device 3, 13 movable grippers can be used, which hold the metal strip 10 either directly on the tape head or laterally at its edges. The first clamping device 3 and the second clamping device 13 are each used for clamping and method, equivalent to guiding or conveying the Metallban- 10, for example, along the rails 5. Specifically, the metal strip 10 with the aid of the first movable clamping device 3 along the rails. 5 moved from the uncoiler 1 to the deflection roller 6 / led. After its deflection around the deflection roller 6, the metal strip 10 with the help of the second movable clamping device 13 along the rails 5 of the guide roller 6 away eg in the direction of a take-up reel 1 method / out. The metal strip 10, in particular cold strip, is stopped after its deflection in at least one predetermined end position. The strip tension is then maintained, for example, with the clamping devices. The metal strip 10 is examined. The examination in the device is clear from Fig. 3. The deflection roller 6 and the deflection of the metal strip 10 by about 180 ° have the advantage that prior to the deflection, the top 11b of the metal strip 10 is above and can be inspected by the examiner 9 by looking from top to bottom. After deflection by the deflection roller 6, the bottom 11 a of the metal strip 10 is above and can be inspected by the examiner 9 again by looking from the top down. In the apparatus I, the top 11b and bottom 11a of the metal strip 10 are inspected visually by a test person 9 from a first stage 4 and a second stage 14; see Fig. 1. In the device II, the top 1 b and underside 11 a of the metal strip 10 are examined by the examiner 9 from a single stage 4; see Fig. 2. In both cases, the stage allows the examination of both the top and the bottom of the metal strip 10 each with a view of the examiner from top to bottom, which is a facilitated working posture for the test person. Basically, the provision of the stage is optional, because the test may alternatively also take place from the hut floor.

The clamping devices 3, 13 with the clamped metal strip preferably rest for the duration of the examination. The upper side 1b and lower side 11a of the band 10 are preferably illuminated with at least one illumination device 7, 17 during the examination. The observers 9 examining the top 11b and bottom 11a of the belt 10, move from the walk-in stage 4 to the walk-in stage 1 and vice versa via a staircase. 8

The cold strip 10 has, for example, a width of 800 mm to 2,100 mm and a thickness of, for example, 0.2 mm (Feinstblech) to 1, 5 mm (sheet) on. The metal strip may be base and quality steel, higher strength grades such as trip and twip steel, or low carbon steels for deep drawing applications. The temperature of the metal strip is a maximum of 300 ° C in the offline study, but typically room temperature.

In the device I, II according to the invention, the time required for the examination is reduced compared to conventional examination devices. For standard off-line inspection systems, about 380 seconds are needed for the entire investigation process. The times for an investigation with the aid of the device I, II according to the invention and the method according to the invention are 250 s and are thus significantly lower.

The period of 250 seconds is distributed among the following operations as follows

Table 1 :

The time advantage of 130 s results at the beginning of the examination when the metal strip 10 is already transported with the clamping device 3 into the examination device.

Tables 2 and 3 below show by way of example the work steps of the collar preparation and examination and after the examination of a cold strip. Table 2

Federal preparation and investigation

No work step

1 coil transport to the examination device I, II

2 Retraction of the coil on the coiler mandrel

3 coiler mandrel spreading

4 Swiveling in the support layers

Lower 5 coil cars

6 Swinging the pressure rollers

7 Turn collar start 180 ° counter to winding direction

8 Retractable clamping device 3 with fret opener 2

9 Turn the collar forwards and insert the beginning into clamping device 3

10 Clamp band 10

11 Pivoting the pressure rollers

12 Release the brake from the unwinder

13 Switch on the tape tensioner

14 Retract clamping device 13 in the federal investigation

15 stopping the clamping device 3, 13 at the end position

16 Close the brake from the Abhaspei and switch off the drive

17 train with the clamping device 3, 13 maintained

18 examine Volume 10 Table 3

Procedure after the examination

No work step

20 Switch on Abhaspei

21 Switch on the belt tensioner

22 Slowly rewind the beginning of the bundle with Abhaspei

23 Swinging the pressure roller 500 mm before the end position

24 Switch off the tape tension

25 clamping device 3, 13 open

26 Position the tape head at 5 o'clock

27 Swing off the pressure roller

28 Position the coil car under the coil

29 Extend swivel bearing

30 Despread

31 Drive the bundle off the coiler mandrel

02.10.2009 le.kl.vh 46

514

LIST OF REFERENCE NUMBERS

1 Horizontal examination device

II Horizontal examination device

1 reel / coil

2 fret openers

3 Movable clamping device

Walk-in stage

5 rails

6 pulley

7 lighting device

8 stairs

9 observer / supervisor

10 cold-rolled strip / metal strip

11a cold-rolled bottom / underside

11 b Cold-rolled strip top side

13 Movable clamping device

14 walk-in stage

17 Lighting device

Claims

claims

An apparatus for inspecting a metal strip (10) having top and bottom surfaces (11b, 11a), comprising:

at least one deflection roller (6) for deflecting the metal strip (10), a first movable clamping device (3) for clamping and moving the metal strip (10) to the deflection roller (6), and a second movable clamping device (13) for clamping and for moving the metal strip (10) after it has been deflected by the deflection roller away from the deflection roller (6).

2. Apparatus according to claim 1, characterized in that it is at the deflection roller (6) is a dancer roll, a work roll or a tape storage roll or a single guide roller.

3. Device according to one of the preceding claims, characterized by at least one walk-in for a test person stage (4, 14) for examining a portion of the underside of the metal strip in front of the deflection roller and / or a portion of the top of the metal strip behind the deflection roller with respect to its Properties or its surface quality.

4. Device according to one of the preceding claims, characterized by an inspection device for examining the top and / or the underside of the metal strip.

5. Device according to one of the preceding claims, characterized by a lighting device (7) for illuminating the upper side (11b) and / or underside (11a) of the metal strip (10) during the investigation.

6. Device according to one of the preceding claims, characterized by rails, along which the first and second clamping device are preferably movable together with the metal strip.

Apparatus according to claim 6, characterized in that the rails are arranged at least approximately horizontally for horizontal method / guiding the metal strip.

Device according to one of the preceding claims, characterized in that the first and the second clamping device are adapted to move the metal strip at such a low speed v, that the metal strip can be examined during the process or in the idle state.

Device according to one of the preceding claims, wherein the deflection roller (6) deflects the metal strip (10) through an angle of 170 ° to 190 °, preferably by 180 °.

Device according to one of the preceding claims, wherein the length of the device, in particular of the rails, at least equal to the road length of a rolling mill.

Device according to one of the preceding claims, characterized in that it is in the first and second clamping device to one and the same device, which is preferably designed to clamp the metal strip during its circulation around the deflection roller.

12. Device according to one of the preceding claims, characterized in that it is the metal strip is cold strip.

13. Device according to one of the preceding claims, characterized in that upstream of the first clamping device in the transport direction of the metal strip unwinding reel (1) for unwinding the metal strip and / or the second clamping device in the transport direction downstream a take-up reel for winding the metal strip is arranged after the deflection ,

14. A method for examining a metal strip having a top and a bottom, wherein

a) the metal strip (10) is moved towards a deflection roller (6), b) the metal strip (10) is deflected by means of the deflection roller; c) the metal strip is moved away from the deflection roller after its deflection; and

15. The method according to claim 14, characterized in that the metal strip is moved horizontally towards the deflection roller and / or horizontally away from the deflection roller.

16. The method according to claim 14 or 15, characterized in that the metal strip is moved at such a low speed that the investigation is possible or that the metal strip rests during its investigation.

17. Use of a device according to one of claims 1 to 13 for carrying out the method according to one of claims 14 to 16.