EP2451595B1 - Method for detecting deflection of a roll stand and/or edger when processing metal goods, method of manufacturing metalled goods using a roll stand and/or edger and device for detecting deflection of a roll stand and/or edger - Google Patents

Description

The invention relates to a method for determining a springing of a rolling stand and / or edging stand during the machining of metal goods and a method for producing a metal good by means of a rolling stand and / or edging stand. Furthermore, the invention relates to a device for determining a springing of a rolling stand and / or edging stand.

The present invention is in the technical field of rolling mill technology. Rolling mill technology is concerned with the production of metal products by rolling, which may be carried out in the form of cold forming or hot working.

In the rolling process used, the classical rolling, in which the work rolls processing the rolling stock are arranged horizontally, are used. The horizontal rolling is usually used to set a certain thickness of the metal. Also, thereby, e.g. during hot rolling, the mechanical properties of the metal to be processed are influenced. The rolling process can be carried out, for example, as disposable rolls or reversing rolls.

Furthermore, the so-called upsetting is used, in which the work rolls are aligned vertically. The upsetting causes an influence of the metal goods in the width direction by exerting appropriate forces.

During the rolling or upsetting of metal material, a generally elastic deformation of a rolling stand or edging stand occurs. This deformation is due to the forces exerted on the metal goods. Because the metal material sets the roller, which transmits the force to the metal goods, counteracting force. This counterforce or the resistance of the rolled material causes a change in shape of the roll stand. Such deformation, in particular elongation, of a roll stand during the processing of metal goods is referred to as springing of the roll stand or edging stand.

If this springing of the roll stand or edging stand during rolling or upsetting of metal goods is not taken into account, considerable deviations from the desired target values of the rolling stock, e.g. Target thicknesses or target widths.

In general, therefore, an attempt is made to compensate for the springing of a rolling mill or edger, that is. keep the roll gap or the compression width as possible to a designated target value. In order to be able to carry out this compensation, it is necessary to have as much knowledge as possible of the actual suspension present on the roll stand or upsetting frame.

To determine a spring-back on a rolling stand or edger, the published patent application DE 101 39 513 A1 Means for determining, as required, a reference characteristic or a reference characteristic of a reversing rolling stand and / or means for determining a spring constant of a roll force-induced springing of the rolls or the entire system on a rolling stock. From these data, in turn, a rolling force-induced springing of the or each roll stand can be determined on the rolling stock. A disadvantage of this method of determining the springing is that the force measurement or working pressure measurement is heavily spring-loaded. The characteristics often also include approximations, such as linearization, etc. Also lead to non-detectable, variable, directional friction forces in the rolling stand or edger to other Errors that additionally falsify the value for the springing determined by means of force measurement and / or working pressure measurement.

The object of the present invention is to provide a method for determining a springing of a roll stand and / or edging stand and a device for determining a springing of a rolling stand and / or edging stand, which make it possible to more accurately determine a springing of a rolling stand and / or edging stand. A further object of the invention is to provide a method with which the quality of a metal product leaving the rolling stand and / or edging stand is increased.

A procedural part of the object is achieved by means of a method for determining a springing of a rolling stand and / or edging stand during the machining of metal goods, wherein at least two reference points for determining the springing are predetermined, wherein at least one of the reference points at a during the processing of the metal deforming scaffolding unit, in particular a scaffold stand, is arranged, and wherein a relative position of the at least two reference points to each other is determined during the processing of the metal good, and from this a springing of the rolling stand and / or edging stand is determined.

In contrast to the prior art, there is a direct determination of the springback, without the use of reference characteristics, etc. In particular, a severely error-prone rolling force measurement or working pressure measurement for determining the springback can be avoided.

In addition, the non-detectable, variable, direction-dependent frictional forces in the scaffolding unit are inherently taken into account by means of the method according to the invention. Because these do not contribute to the deformation of the scaffold unit, and thus also accordingly not included in the determination of the invention according to the invention. By this method, it is possible to realize a springing of a rolling stand and / or edger stand much easier and more accurate.

The term reference point is used in the context of this application in terms of a reference position, i. in the sense of location information, used.

In an advantageous embodiment of the method according to the invention, the relative position is determined by measuring a distance of two reference points from each other. This is particularly easy to implement technically. In particular, it is advantageous if the reference points are part of a measuring device for measuring a distance of the two reference points. Alternatively, however, the measuring device can also be designed such that the at least two reference points are not part of a measuring device, so that they can be arranged almost arbitrarily. Thereby, if necessary, for each rolling mill, an individual solution - e.g. due to space issues - be provided.

In a further advantageous embodiment of the method according to the invention, the springing of the roll stand and / or edging stand is based on a comparison of a distance between the at least two reference points in a load-free state of the roll stand and / or edging stand and a distance of the at least two reference points in a loaded state of the roll stand and / or Stauchgerüsts determined. By this comparison, it is particularly easy to determine a springing of the rolling stand and / or edging stand during the machining of metal goods. A load-free state of the roll stand is usually present when no metal material is processed with this mill, ie the rolling stock is neither driven nor rolled. On the other hand, for example, the driving and / or rolling of a metal good should be regarded as a loaded state of a rolling stand. Analogously, this applies to a compression frame.

In a further advantageous embodiment of the method according to the invention, the at least two reference points are arranged on the scaffolding unit. Due to the arrangement of the at least two reference points on the scaffold unit, the springing can be detected in an improved manner. A scaffolding unit may be, for example, a scaffold stand, or optionally also a housing, e.g. a stuffer. If necessary, this housing can simultaneously act as a scaffold stand.

In particular, the springback can be detected in an improved manner if the at least two reference points for a roll stand lie in vertical direction on two different sides of the roll gap. This is analogously the case if, in the case of an upsetting frame, the at least two reference points lie in the horizontal direction on two different sides of the compression region. This generally means that the at least two reference points are arranged on different sides with respect to a plane running parallel to the longitudinal axes of the work rolls or compression rolls-in the load-free state-through the roll gap or upset region, respectively. In particular, it is advantageous to arrange the at least two reference points in each case in the first quarter and in the fourth quarter of a longitudinal extent of a rolling mill stand or edging stand. The longitudinal extent of the framework stand is the direction in which the rolling stand or edger has the largest spatial dimension. By doing so, the length of the measurement path is increased, which in turn further increases the accuracy for determining the springback. It can be specified a plurality or plurality of reference points per rolling stand and / or edging stand, z. B. two to four per mill stand side, i. two to four each on the operating side and drive side of the rolling stand. All the above statements apply analogously to a compression frame.

In an advantageous embodiment variant of the method according to the invention, the distance of the at least two reference points is determined contactless, in particular by means of a laser. By way of example, the laser light source forms a first reference point which is rigidly fastened to the rolling stand or upsetting frame, and a reflector which reflects the laser light, for example a mirror, a second reference point preferably also fixed rigidly to the rolling stand and / or edging stand. The rigid attachment ensures that the reference points, which in this case are only indirectly connected to the roll stand, follow the deformation of the roll stand.

In another advantageous embodiment of the method according to the invention, the distance between the at least two reference points is determined by contact. For example, this can be done with commercially available displacement sensors e.g. be realized by means of Sony-Weg sensors, Temposonic-way sensors, MTS-way sensors or other commercially available displacement sensors. For example, in this case a two-part sensor is used, wherein both parts are firmly connected to the rolling mill stand and / or Stauchgerüstständer. Furthermore, the two parts are movably coupled to each other in such a way that a relative movement of the two sensor parts to one another, in particular a change in the distance, can be detected. By using commercially available displacement sensors, it is possible to realize a simple distance measurement for the determination of a spring-back effect in a particularly cost-effective manner.

The procedural part of the object is likewise achieved by a method for producing a metal good by means of a roll stand and / or edging stand, wherein a suspension of the rolling stand and / or edging stand caused by the metal goods passing through the rolling stand and / or edging stand is provided with a method according to one of the claims 1 to 5 is determined, wherein the thus determined springing, in particular online, is used to determine a manipulated variable for the roll stand and / or edger stand for influencing the rolling mill and / or edging mill continuous metal stock. By using the improved determination of the spring-back, the production of the metal good can also be improved become. Because of the improved preliminary investigation for the springing up, this can be better compensated. In particular, the manipulated variables determined from the springing-up for compensating the springing-up can be determined more accurately with regard to the rolled metal product, thereby increasing the quality of the metal product produced.

The device-related part of the object is achieved by means of a device for determining a springing of a rolling stand and / or edging stand, comprising a measuring device for detecting a distance between two reference points, wherein at least one of the reference points on a deforming during processing scaffold unit, in particular a rolling mill stand or Stauchgerüstständer is arranged, wherein the detected measured values corresponding signals of a signal processing means are fed, which is designed such that by means of this, the springing from the detected measured values can be determined. By the device according to the invention, it is possible to realize a direct determination of the springing of a rolling stand and / or edging stand, whereby the accuracy for the determination of a springing can be significantly increased. The resulting from the prior art disadvantages by an indirect determination of the spring-back are eliminated by the device according to the invention.

In an advantageous embodiment of the device according to the invention, the at least two reference points are arranged on the scaffold unit, in particular on the rolling mill stand and / or on the swaging stand. This has the advantage that the springing can be determined very accurately. Specific advantageous arrangements of the reference points can be found in the above part of the description, which deals with the method for determining the springing.

In a further advantageous embodiment of the device according to the invention, the measuring device is as contactless working measuring device, in particular optically operating measuring device, or as contact-type measuring device for detecting the distance of the at least two reference points formed from each other. The advantages for the non-contact measuring device are that there is a significantly lower wear of the measuring device compared to the contact-type measurement. The contact-based measurement, however, has the advantage that it can be realized relatively inexpensively.

In a particularly advantageous embodiment of the device according to the invention, the signal processing device is operatively connected to a control and / or regulating device which has machine-readable program code which comprises control commands which, when executed, the control and / or regulating device for carrying out a method according to one of claims 1 to induce 7. The integration of a control and / or regulating device in the device has the advantage that the more accurate determination of the springing can be fed directly to an improved processing of metal material. By means of the control and / or regulating device, manipulated variables can be determined, e.g. Rolling force, positioning position of the positioning system, in particular for the hydraulic cylinders, roll tilt, roll bending, etc. These directly influence the machining of the metal stock. Improving the determination of the springback improves the determination of the control variables, which increases the quality of the metal product to be produced.

FIG 1

eine schematische Darstellung einer erfindungsgemäßen Vorrichtung zur Messung einer Auffederung eines Walzgerüsts mittels einer kontaktbehaftet arbeitenden Messeinrichtung,

FIG 2

eine schematische Darstellung einer Vorrichtung zur Ermittlung einer Auffederung eines Walzgerüsts mittels einer kontaktlos arbeitenden Messeinrichtung,

FIG 3

eine schematische Darstellung eines Walzgerüsts, wobei ein Referenzpunkt zur Bestimmung der Auffederung am Walzgerüstständer angeordnet ist und der zweite Referenzpunkt nicht vom Walzgerüst umfasst ist.

Further advantages of the invention will become apparent from the following embodiments, which are illustrated by schematic drawing. Show it:

FIG. 1

a schematic representation of an apparatus according to the invention for measuring a springing of a roll stand by means of a contact-type measuring device,

FIG. 2

a schematic representation of an apparatus for determining a springing of a roll stand by means of a non-contact measuring device,

FIG. 3

a schematic representation of a rolling stand, wherein a reference point for determining the Auffederung is arranged on the rolling stand stand and the second reference point is not included in the rolling stand.

FIG. 1 shows a schematic representation of a rolling mill 1. The rolling stand 1 comprises a rolling mill stand 5, a pair of support rollers 2, and a few work rolls 3 for processing the metal G. Further, the roll stand 1 comprises a in FIG. 1 not shown in detail Anstellsystem.

Runs metal G in the rolling stand 1, so there is a springing of the roll stand 1 and thus to a change in the set roll gap between the work rolls. 3

In order to compensate for this springing or undesired change of the roll gap between the work rolls 3, according to the embodiment FIG. 1 two measuring devices 6 are provided, which detect a deformation of the rolling stand 5 of the rolling stand 1 by means of a distance measurement. In the embodiment according to FIG. 1 These are designed as Temposonic displacement sensors.

In this case, a reference point R1 or R3 respectively lies on a first side of a plane parallel to the longitudinal axes of the work rolls through the nip 3 and a respective reference point R2 or R4 of the measuring devices 6 on the second side of the distance measurements taken by the measuring devices 6 Level. In a rolling mill 1 according to FIG. 1 this plane passing through the nip is horizontal or perpendicular to the page. For example. is the middle fiber of the incoming into the mill metal stock within this plane.

To increase the accuracy of the measurement of the change in shape or the resilience of the roll stand 5, the respective measuring device 6 on guide elements 8. Through this, the accuracy of the measurement is increased, since the proper motion of the respective measuring device 6 is reduced.

The detected by the measuring devices 6 distances are supplied as signals of a signal processing device 9. This signal processing device 9 determines from the detected distances or changes in distance between the loaded state of the roll stand 1 and unloaded state of the roll stand 1, the spring-back.

The determination of the spring-back is preferably carried out continuously, in particular while the metal good G is being processed by the roll stand 1.

The deflection determined by means of the signal processing device 9 can in particular be used for controlling and / or regulating the in FIG. 1 Not shown adjusting system can be used. This can be done by manual intervention of operating personnel. Preferably, however, this is done automatically.

FIG. 2 shows a further rolling stand 1. In this rolling stand 1, a contactless measuring device 7 for determining a distance between two reference points R1 and R2 and R3 and R4 is present. The measuring device 7 is designed as a laser distance measuring device.

Preferably, at least one measuring device 7, preferably two measuring devices as in FIG. 2 represented, in each case arranged on the drive side and on the operating side of the roll stand 1. As a result, it is possible to determine a spring-back of the roll stand 1 with particular accuracy.

Each measuring device 7 comprises in the exemplary embodiment a laser light source, emanating from the laser light, and vertically down, preferably parallel to the surface of the framework stand 5 meets a reflector, which is also associated with the measuring device 7. The reflector reflects the light incident from the laser light source back toward the laser light source where it is detected.

Based on the transit time of the laser light or a laser light pulse between the laser light source and the laser light receiving unit, a distance between the reference points R1 and R2 or R3 and R4 can be determined.

This information is supplied in the form of signals to the signal processing device 9, which determines therefrom a springing of the roll stand 1.

The determined springing is fed to a control and / or regulating device 10, which ascertains correcting variables for the setting system 4 of the rolling stand 1 on the basis of the determined springing so that the springing of the rolling stand 1 has as far as possible no undesired effects on the metal goods G expiring from the rolling stand 1 , Manipulated variables can be, for example, the rolling force or the contact pressure, the piston position of the hydraulic cylinders, the roll bending, the roll displacement, the roll angle, etc.

The positioning system 4 of the roll stand 1 is thus operated by means of the control variables determined by the control and / or regulating device 10 such that the rolling stock G when leaving the rolling mill 1 as possible a certain Solleigenschaft, in particular target thickness has.

In order to make this possible, the control and / or regulating device comprises machine-readable program code which determines corresponding manipulated variables from the ascertained springing, and adjusts the actuators in accordance with the determined manipulated variables. The determination of manipulated variables based on a determined springing, can be found in the prior art.

The signal processing device 9 and the control and / or regulating device 10 can also be structurally combined.

In FIG. 3 only a single measuring device 7 is provided to determine the spring-back of the roll stand 1. The rolling mill 1 according to FIG. 3 comprises a roll stand 5, a set of back-up rolls 2 and a set of work rolls 3, and an adjusting system 4, not shown in more detail.

With regard to the measuring device 7 is the difference to the in FIG. 2 shown measuring device 7 in that only one reference point R1 is arranged on the roll stand 5. The second reference point R2 is isolated from the roll stand 1. It can also be provided a further measuring device 7, which according to the embodiment FIG. 2 is completely arranged on the roll stand 1. The arrangement of reference points on the roll stand 1, in particular on the frame stand, or separately from the roll stand 1 can be arbitrarily, as far as considered by experts to be useful combined.

For example, a reference point separated from the roll stand 1 can be at a positionally fixed machine component that is different from the roll stand 1. For example, this can also be the foundation for the rolling stand, or the ground. The selection of a suitable non-rolling stand 1 arranged on the reference point is the skilled person.

Such an approach is also possible to determine a springing of a rolling stand.

All statements made apply analogously to upsetting scaffolding. These differ only in that the rollers are vertical and thus the Anstellsystem usually horizontal forces exerted on the metal goods. The edger stand can also be designed as a housing for the edger.

In general, a measuring device can determine the relative position of at least two reference points on the drive side and / or on the operating side of the roll stand. In particular, at least one measuring device for determining the relative position of the respective at least two reference points can be provided on the drive side and on the operating side.

A determination of the suspension on the drive and operator side has the advantage that the spring-back for the entire rolling stand and / or edger can be determined.

Claims (13)

1. Method for determining a spring-back of a roll stand (1) and/or edger during the processing of metal products (G),
   characterised in that at least two reference points (R1, R2, R3, R4) are predetermined for establishing the spring-back, wherein at least one of the reference points (R1, R2, R3, R4) is arranged on a stand unit which deforms during the processing of the metal product (G), especially a stand frame (5), and that during the processing of the metal product (G) a relative position of the at least two reference points (R1, R2, R3, R4) in relation to one another is established, and that a spring-back of the roll stand (1) and/or edger is determined.
2. Method according to claim 1,
   characterised in that the relative position is established by measuring a distance between the at least two reference points (R1, R2, R3, R4).
3. Method according to claim 2,
   characterised in that the spring-back of the roll stand (1) and/or the edger is determined on the basis of a comparison of a distance between the at least two reference points (R1, R2, R3, R4) in a load-free state of the roll stand (1) and/or edger and a distance between the at least two reference points (R1, R2, R3, R4) in a loaded state of the roll stand (1) and/or edger.
4. Method according to one of the preceding claims,
   characterised in that the at least two reference points (R1, R2, R3, R4) are arranged on the stand unit (5).
5. Method according to one of the preceding claims,
   characterised in that the distance between the at least two reference points (R1, R2, R3, R4) is determined in a non-contact manner, especially by means of a laser.
6. Method according to one of the preceding claims,
   characterised in that the distance between the at least two reference points (R1, R2, R3, R4) is determined in a contact-based manner.
7. Method for producing a metal product (G) by means of a roll stand (1) and/or an edger, wherein a spring-back of the roll stand (1) and/or edger caused by a metal product (G) passing through the roll stand (1) and/or edger is determined with a method in accordance with one of the preceding claims, wherein the spring-back determined in this way is included, especially online, for determining an adjustment variable, especially rolling force, angled position of rolls, bending of rolls for the roll stand (1) and/or edger for influencing the metal product (G) passing through the roll stand (1) and/or edger.
8. Device for determining a spring-back of a roll stand (1) and/or edger, comprising a measurement device (6, 7) for recording a distance between two reference points (R1, R2, R3, R4), wherein at least one of the reference points (R1, R2, R3, R4) is arranged on a stand unit, especially a stand frame (5), which deforms during processing, whereby the recorded measured values are able to be supplied as corresponding signals to a signal processing device (9) which is embodied such that by means of the signals the spring-back is able to be determined from the recorded measured values.
9. Device according to claim 8,
   characterised in that the at least two reference points (R1, R2, R3, R4) are arranged such that a change in the distance between the reference points (R1, R2, R3, R4) in the non-loaded state of the roll stand (1) and/or edger and in a loaded state of the roll stand (1) and/or edger is essentially a maximum change.
10. Device according to claim 8 or 9,
    characterised in that the at least two reference points (R1, R2, R3, R4) are arranged on the stand unit, especially on the stand frame (5).
11. Device according to one of the claims 8 to 10,
    characterised in that the measurement device is embodied as a measurement device (7) operating in a non-contact manner, especially a measurement device (7) operating optically, or as a contact-based measurement device (6) for recording the distance of the at least two reference points (R1, R2, R3, R4) from one another.
12. Device according to one of the claims 8 to 11,
    characterised in that the signal processing device (9) is actively connected to an open-loop and/or closed-loop control device (10), having machine-readable program code which comprises control commands which, when executed, cause the open-loop and/or closed-loop control device (10) to execute a method according to one of claims 1 to 7.
13. Roll stand with a device according to one of claims 8 to 12.

Images