EP3429771B1 - Device and method for descaling a workpiece - Google Patents
Device and method for descaling a workpiece Download PDFInfo
- Publication number
- EP3429771B1 EP3429771B1 EP17711626.6A EP17711626A EP3429771B1 EP 3429771 B1 EP3429771 B1 EP 3429771B1 EP 17711626 A EP17711626 A EP 17711626A EP 3429771 B1 EP3429771 B1 EP 3429771B1
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- workpiece
- nozzle arrangement
- jet nozzle
- control device
- target value
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- 230000003247 decreasing effect Effects 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 2
- 235000019577 caloric intake Nutrition 0.000 claims 4
- 239000007921 spray Substances 0.000 description 19
- 238000005516 engineering process Methods 0.000 description 9
- 238000005096 rolling process Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
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- 230000018109 developmental process Effects 0.000 description 5
- 230000001419 dependent effect Effects 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000011265 semifinished product Substances 0.000 description 2
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
- B05B13/0463—Installation or apparatus for applying liquid or other fluent material to moving work of indefinite length
- B05B13/0484—Installation or apparatus for applying liquid or other fluent material to moving work of indefinite length with spray heads having a circular motion, e.g. being attached to a rotating supporting element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
- B05B14/30—Arrangements for collecting, re-using or eliminating excess spraying material comprising enclosures close to, or in contact with, the object to be sprayed and surrounding or confining the discharged spray or jet but not the object to be sprayed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
- B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
- B05B3/022—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements the rotating deflecting element being a ventilator or a fan
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
- B08B3/022—Cleaning travelling work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
- B05B13/0421—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with rotating spray heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2203/00—Details of cleaning machines or methods involving the use or presence of liquid or steam
- B08B2203/02—Details of machines or methods for cleaning by the force of jets or sprays
- B08B2203/0264—Splash guards
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B2038/004—Measuring scale thickness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2275/00—Mill drive parameters
- B21B2275/02—Speed
- B21B2275/06—Product speed
Definitions
- the invention relates to a device for descaling a workpiece according to the preamble of claim 1 and a corresponding method according to the preamble of claim 9.
- a scale washer in a hot rolling mill is an assembly that is used to remove scale, i.e. H. of impurities from iron oxide, is provided from the surface of the hot rolling stock.
- a scale washer which is arranged upstream of or in relation to the direction of movement upstream of a final scaffold, is usually operated at maximum pressure and volume flow for the high-pressure water. This is done for the purpose of achieving the most descaling possible on the surfaces of the hot rolled material.
- a disadvantage of such a mode of operation of a scale washer is the great need for energy to produce high-pressure water.
- Out JP-10 282029 A a method is known for measuring the thickness of a steel plate and for determining the nature of its surface.
- An X-ray detector is used here.
- a device for detecting scale on a hot rolled product is known.
- a scale detection device is used, which is based on the principle of temperature measurement and for this purpose comprises a pyrometer.
- a device for descaling semi-finished products which has a nozzle device, by means of which a fluid is applied under high pressure to the surface of the semi-finished product moved relative to the nozzle device.
- a fluid is applied under high pressure to the surface of the semi-finished product moved relative to the nozzle device.
- means are provided with which the strip profile can be detected directly, the height of the nozzle device being dependent on this.
- a surface inspection is only installed at the end of the rolling train. Such a surface inspection is spatially far removed from a scale washer and, in particular in terms of process technology, is not connected to the scale washer. If it should be determined by means of the surface inspection that the hot rolled material has surface defects, several production steps, in particular rolling processes, have already been carried out. The consequence of this is that a clean assignment of possible scale defects to the detected surface defects is not possible or is only possible to a limited extent. In other words, in the systems for descaling hot rolled products known to date, it is at least difficult, if not impossible, to reliably identify surface defects as scale residues.
- the object of the invention is to optimize the descaling of workpieces with regard to the surface quality and also to reduce the need for energy and high-pressure liquid to a necessary minimum.
- the invention provides a device for descaling a workpiece, preferably a hot rolled product, which is moved relative to the device in one direction of movement.
- the device comprises at least one first jet nozzle arrangement with a plurality of jet nozzles, from which a liquid, in particular water, can be applied to a surface of the workpiece under high pressure.
- the device comprises a control device and a surface inspection device connected to the control device by means of signals, which is arranged downstream of the jet nozzle arrangement with respect to the direction of movement of the workpiece and enables the detection of scale on the surface of the workpiece.
- the surface inspection device is arranged directly adjacent to the jet nozzle arrangement.
- the control device is set up in such a way that the specific energy input with which a surface of the workpiece is acted upon by the liquid discharged from the jet nozzles can be regulated by means of the control device as a function of the signals of the surface inspection device, and that a surface quality is based on the signals of the surface inspection device determined for the workpiece and compared with a predetermined target value.
- the specific energy input regulated in such a way that it is increased if the surface quality of the workpiece falls below the predetermined target value and is decreased if the surface quality of the workpiece exceeds the predetermined target value.
- the invention provides a method for descaling a workpiece, preferably a hot rolled product, which is moved in one direction of movement relative to a blasting nozzle arrangement with a plurality of blasting nozzles.
- a liquid in particular water
- a control device is provided which is connected to the jet nozzle arrangement and to a surface inspection device in terms of signal technology.
- the specific energy input with which a surface of the workpiece is acted upon by the liquid discharged from the jet nozzles is regulated by the control device as a function of the signals from the surface inspection device, a surface quality for the workpiece being determined on the basis of the signals from the surface inspection device and with a predetermined target value is compared.
- the specific energy input is regulated in such a way that it is increased if the surface quality of the workpiece falls below the predetermined target value, and is reduced if the surface quality of the workpiece exceeds the predetermined target value.
- the invention is based on the essential finding that a surface inspection device is arranged close to the jet nozzle arrangement.
- the feature "close to location" in the sense of the present invention means that the surface inspection device - in relation to the direction of movement with which the workpiece is moved past the jet nozzle arrangement at a feed rate - is positioned downstream of the jet nozzle arrangement and immediately adjacent thereto .
- the specific energy input is determined according to the present invention from the impact pressure with which the liquid impinges on a surface of the workpiece, and the specific volume flow per width of the workpiece, i.e. the volume flow of the liquid sprayed onto the workpiece divided by the spray width in relation to the direction of movement of the workpiece.
- the impact pressure is dependent on the pressure with which the liquid is supplied to the jet nozzles, the volume flow sprayed out, and the distance of the jet nozzles from the surface of the workpiece.
- the specific energy input depends on the feed rate at which the workpiece is moved in the direction of movement.
- the specific energy input depending on the signals of the surface inspection device, can be changed by adapting the parameters mentioned above, namely by means of the control device, as will be explained in detail below.
- the control device is set up in terms of program technology in such a way that the specific energy input is regulated on the basis of the signals of the surface inspection device.
- the control device namely on the basis of the signals from the surface inspection device, determines a surface quality for the workpiece and then compares it with a predetermined target value. If it is subsequently determined by means of the control device that the surface quality of the workpiece falls below the predetermined target value, the specific energy input is then increased. Conversely, this means that if the surface quality of the workpiece exceeds the predetermined target value, then the specific energy input is reduced accordingly.
- Such a setting or adaptation of the specific energy input, based on the signals of the surface inspection device is carried out in a controlled manner according to a preferred embodiment of the invention, ie by providing a corresponding control loop in the control device.
- the actuators for controlling and / or regulating the specific energy input are the system pressure of the descaling, the height adjustment of the jet nozzles, i.e. the change in the distance of the jet nozzles to the surface of the workpiece, the connection / disconnection of an additional jet nozzle arrangement, and the feed speed of the workpiece to disposal.
- a smaller amount of high-pressure liquid is advantageously required, and thereby a reduced cooling of the workpiece is also achieved.
- Such reduced cooling can be used to lower a furnace temperature or to lower the energy requirement for a subsequent rolling process, i. H. downstream of the jet nozzle arrangement.
- the final temperature of the product is increased by a reduced cooling of the workpiece, as a result of which the product range can be expanded to lower final pressures.
- a possible reduction in the specific energy input or the descaling pressure at least to a pressure value that is just sufficient to achieve the predetermined target value for the surface quality of the workpiece, leads to the advantage of a lower energy requirement for generating the high pressure Descaling liquid.
- the wear on system components of the device according to the invention or of the entire descaling system is also advantageously reduced. This applies both to the jet nozzles themselves and to a large extent to the pumps, pipelines and all parts that come into contact with the media.
- the device comprises a high-pressure pump unit which is connected to the control device by means of signals and is in fluid communication with the jet nozzles of the jet nozzle arrangement.
- This high-pressure pump unit can be controlled, preferably regulated, by means of the control device in order to change the pressure with which the liquid is supplied to the jet nozzles.
- the descaling or impact pressure with which the liquid bounces on a surface of the workpiece also changes accordingly in order to descale the workpiece as desired.
- this also changes the specific energy input with which the liquid is applied to the surface of the workpiece.
- the high pressure pump unit can have a plurality of individual pumps.
- the high-pressure pump unit When the high-pressure pump unit is activated by means of the control device, it can be provided that a further pump is switched on in the event of a pressure increase, or that one of the pumps used is switched off in the event of a desired pressure reduction.
- the high-pressure pump unit can be equipped with at least one frequency regulator, or preferably with a plurality of frequency regulators.
- a pump or the pumps of the high-pressure pump unit is / are connected to an electrical supply network via this frequency controller, the respective frequency controller being connected to the control device in terms of control technology. Accordingly, it is possible to control or regulate the frequency controller of the high-pressure pump unit by means of the control device such that the pressure with which the liquid is supplied to the jet nozzles of a jet nozzle arrangement is also set or changed to a small extent or with small increments, preferably also continuously can be.
- a distance which the jet nozzle arrangement has from the surface of the workpiece is controlled, preferably regulated, changed by means of the control device, namely as a function of the signals of the surface inspection device.
- the jet nozzle arrangement is attached to a height-adjustable holder with an actuator, the actuator being signal-connected to the control device. If the surface quality determined by the control device on the basis of the signals from the surface inspection device falls below a predetermined target value, the distance between the jet nozzle arrangement and the surface of the workpiece can be reduced by suitable control of the actuator by means of the control device, with the result that the impact pressure is thereby reduced the liquid or the descaling pressure increases.
- it goes without saying that such a change in the spacing of the jet nozzle arrangement takes place only to the extent that a desired spray pattern of the jet nozzles remains on the surface of the workpiece.
- the feed rate of the workpiece can be adapted to adapt the specific energy application in accordance with the control device, provided that the overall process allows it.
- Another advantage of the present invention is that, thanks to a reliable signal for the surface quality or surface quality of the workpiece, which is detected immediately downstream of the jet nozzle arrangement, it is possible for the device to use only a single pair of a jet nozzle arrangement, i . H. above and below the workpiece.
- a device according to the invention can be limited to such a pair of jet nozzle arrangements, as a result of which considerable investment costs for the likewise reduced high-pressure pump unit and associated connecting pipelines can be saved. This in turn results in a space saving for the high-pressure pump unit, a reduction in the roller table and a relief of the water management, which supplies the high-pressure pump unit with liquid.
- a device 10 according to the invention serves for descaling a workpiece 12 which is moved in a direction of movement X relative to the device 10.
- the workpiece can be hot rolled material that is moved past the device 10.
- a feed rate at which the workpiece 12 is moved past the device 10 in the direction of movement X is shown in FIG Fig. 1 and in Fig. 2 each symbolized by the arrow "v".
- a device 10 according to the invention has a jet nozzle arrangement with a plurality of jet nozzles, from which a liquid, in particular water, is sprayed onto a surface of a workpiece under high pressure.
- the jet nozzle arrangement can consist of a rotor head ( Fig. 1 ) or from a spray bar ( Fig. 2 ) be formed, as explained in detail below.
- jet nozzles 16 are provided, from which a liquid 18 (in Fig. 1 simply symbolized with dashed lines) is sprayed under high pressure onto a surface 20 of the workpiece 12 in order to descaling the workpiece 12 in a suitable manner.
- a jet nozzle arrangement which, as just explained, is in the form of a rotor head 14 which can be rotated about an axis of rotation R.
- the rotor head 14 is rotated about its axis of rotation R by motor means (not shown), for example by an electric motor.
- the jet nozzles 16 are attached to an end face of the rotor head 14 which faces the workpiece 12.
- the jet nozzles 16 are in the embodiment of FIG Fig. 1 firmly attached to the rotor head 14.
- the longitudinal axes L of the jet nozzles 16 are aligned parallel to the axis of rotation R of the rotor head 14.
- the jet nozzles 16 are designed to be height-adjustable, for example by attaching them to a height-adjustable holder which is arranged in the Fig. 1 and Fig. 2 simplified symbolized by the double arrow "H".
- the holder H can have an actuator (not shown in the drawing).
- a distance A which an end face of the jet nozzles 16 has to the surface 20 of the workpiece 12, can thus be adjusted, if necessary, by actuating the actuator. In the sense of the present invention, this distance A is to be understood as the spraying distance. If this distance A is reduced, the resulting impact pressure of the liquid 18 on the surface 20 of the workpiece 12 increases.
- the device 10, such as for the embodiment of FIG Fig. 1 shown comprises a control device 22 and a high-pressure pump unit 24, which is connected to the control device 22 for signaling purposes.
- the rotor head 14 is connected to the high-pressure pump unit 24 via a connecting line in such a way that the jet nozzles 16 are in fluid communication with the high-pressure pump unit 24 and are therefore supplied with a liquid under high pressure by the high-pressure pump unit 24.
- the liquid 18, which is then sprayed under high pressure from the jet nozzles 16 onto the workpiece 12 it is preferably water, without any restriction being limited to the medium water.
- the high-pressure pump unit 24 is equipped with a frequency controller 25. This makes it possible, in particular, to control the high-pressure pump unit 24 in a stepless manner by means of the control device 22 in order to be able to change the pressure at which the liquid 18 is supplied to the jet nozzles 16 even in small steps. Further details for such a control of the high-pressure pump unit 24 are set out in detail below.
- the device 10 comprises a surface inspection device 26, which - in relation to the direction of movement X of the workpiece 12 - is arranged downstream of the rotor head 14 and close to it.
- the surface inspection device 26 can be based on a specialized optical measuring principle in which a 3D measurement is carried out for a surface 20 of the workpiece 12 and a height profile for the surface 20 of the workpiece 12 is derived from this. Alternatively, a spectral analysis is carried out on the surface 20 of the workpiece 12 by means of the surface inspection device 26.
- the surface inspection device 26 is also connected to the control device 22 in terms of signal technology.
- scale or residual scale can be detected on the surface 20 of the workpiece 12.
- the surface inspection device 26 is designed such that both an upper side and an underside of the workpiece 12 are monitored.
- the signaling connection between the control device 22 and the high-pressure pump unit 24 is shown in FIG Fig. 1 designated by reference numeral 23.1.
- the signal connection between the control device 22 and the surface inspection device 26 is designated by the reference symbol 23.2.
- the signaling connection between the control device 22 and the height adjustment H is designated by the reference symbol 23.3.
- the signal connection between the control device 22 and a device (not shown), by means of which the feed speed v of the workpiece 12 can be set or changed, is identified by the reference symbol 23.4.
- These connections 23.1, 23.2, 23.3 and 23.4 can either be physical lines or a suitable radio link or the like.
- the high-pressure pump unit 24 and the surface inspection device 26 apply to the embodiment of FIG Fig. 2 the same relationships as for the embodiment of Fig. 1 , these technical components for simplification in Fig. 2 are not shown.
- Fig. 3 shows a further embodiment of the device 10 according to the invention, namely in a simplified top view.
- two jet nozzle arrangements 14.1 and 14.2 are arranged one behind the other with respect to the direction of movement X of the workpiece 12.
- Each of these jet nozzle arrangements 14.1 and 14.2 is connected to the high pressure pump unit 24, as with reference to FIG Fig. 1 explained.
- the surface inspection device 26 is positioned downstream of the jet nozzle arrangement 14.2.
- a width of the workpiece 12 extends in the direction y, the axes of rotation R for the rotor heads 14.1 and 14.2 each running perpendicular to the plane of the drawing.
- the jet nozzle arrangement 14.1 is a pair of rotor heads 28 (cf. Fig. 4 ) can be, wherein the jet nozzle arrangement 14.2 arranged downstream thereof is a spray bar pair 38 (cf. Fig. 2 ) can act.
- the spray bar pair 38 also correspond to the jet nozzle arrangement 14.1, where then the pair of rotor heads 28 is arranged downstream thereof, namely at the location of the jet nozzle arrangement 14.2.
- the jet nozzle arrangements 14.1 and 14.2 in the embodiment of FIG Fig. 3 both either from a pair of rotor heads 28 ( Fig. 4 ), or each from a spray bar pair 38 ( Fig. 2 ) are formed.
- Fig. 4 shows a side view of a pair of rotor heads 28, in which a rotor head 14 is provided above and below the workpiece 12, ie both on its top and on its bottom. It can be seen that the rotor head 14, which is arranged below the workpiece 12, is positioned downstream of the rotor head 14, which is arranged above the workpiece 12, with respect to the direction of movement X of the workpiece 12. This is so that the liquid 18 which is sprayed out of the jet nozzles 16 of the rotor head 14 arranged below the workpiece 12 does not collide with the rotor head 14 arranged above the workpiece 12 if there is no workpiece 12 between these two rotor heads.
- Fig. 4 shows a side view of a pair of rotor heads 28, in which a rotor head 14 is provided above and below the workpiece 12, ie both on its top and on its bottom. It can be seen that the rotor head 14, which is arranged below the workpiece 12, is positioned downstream of the rotor head 14, which
- Fig. 4 it is additionally pointed out that this can also be a side view of a pair of rotor modules in which a plurality of rotor heads 14 (cf. Fig. 1 ) are combined in the y direction to form a rotor module above and below a workpiece 12.
- the individual jet nozzles 16 are connected to a common pressurized water line D, which is connected to the high-pressure pump unit 24. This ensures that the jet nozzles 16 are supplied with high-pressure water.
- Fig. 2 shows a simplified side view of a device 10 according to the invention according to a further embodiment.
- a jet nozzle arrangement of the device 10 is designed in the manner of a so-called spray bar 36, the longitudinal extension of which is transverse (ie in Fig. 2 in the direction of the y-axis) to the direction of movement X of the workpiece 12.
- the longitudinal extent of a spray bar 36 generally corresponds to a width of the workpiece 12 to be descaled.
- a plurality of jet nozzles 16 are arranged, of which only the jet nozzle 16 lying at the front is shown in the illustration in FIG. 7.
- a spray bar 36 is provided above and below the workpiece 12, which thus form a spray bar pair 38.
- the jet nozzles 16 of the spray bar pair are arranged on the spray bars 36 at an angle with respect to an orthogonal to the surface 20 of the workpiece 12 such that the liquid 18 which is sprayed out of the jet nozzles 16 has an angle ⁇ on the surface 20 of the workpiece 12 strikes.
- a separate surface scanning unit 40 ( Fig. 3 ) may be provided, which is arranged upstream of a jet nozzle arrangement 14 and is connected to the control device 22 in terms of signal technology.
- a surface scanning unit 40 functions electronically and comprises an optical measuring system that can work according to the laser beam principle. If an irregularity should occur on the surface, this is detected by the surface scanning unit 40 and a corresponding one Signal generated, on the basis of which the control device 22 then the actuator of the height-adjustable bracket H (see. Fig. 1 , Fig. 2 ) controls to immediately increase the distance A of the jet nozzle arrangement to the surface of the workpiece 12. This ensures that the jet nozzle arrangement is not damaged if the workpiece 12 should have such an irregularity.
- the workpiece 12 is moved past the device 10, namely at a feed rate which is symbolized in the respective figures with "v".
- a specific energy input E or "spray energy"
- the impact pressure with which the liquid 18 impinges on the surface 20 of the workpiece 12 is dependent both on the pressure and the volume with which the liquid is sprayed out of the jet nozzles 16 and on the distance the jet nozzles 16 from the surface 20 of the workpiece.
- V ⁇ spec V ⁇ b
- the invention now works as follows: For a desired descaling of the surfaces 20 of the workpiece 12, it is moved in the direction of movement X relative to the device 10 according to the invention.
- the liquid 18 is sprayed from the jet nozzles 16 under high pressure onto the surfaces 20 of the workpiece 12, namely both on its upper side and on its lower side.
- the specific energy input E can be increased, for example, by increasing the pressure with which the liquid is supplied to the jet nozzles and / or the volume flow V, and / or by increasing the distance A of the jet nozzles to the surface 20 of the workpiece 12 and / or the feed speed v are reduced, and / or by connecting a further jet nozzle arrangement.
- a reduction in the specific energy input E is achieved by the pressure at which the liquid is supplied to the jet nozzles and / or the volume flow V is reduced, and / or by increasing the distance A of the jet nozzles to the surface 20 of the workpiece and / or the feed speed v, and / or by adding another Jet nozzle arrangement is switched off.
- an increase in the specific energy input E takes place e.g. in the event that it is determined on the basis of the signals from the surface inspection device 26 by means of the control device 22 that the surface quality of the workpiece 12 falls below a predetermined target value. Conversely, this means that the specific energy input E is reduced as long as the surface quality of the workpiece 12 maintains a predetermined target value.
- Fig. 5 shows a flowchart to illustrate an operating mode of the device 10 according to the invention or an implementation of a method according to the invention.
- the descaling quality is continuously monitored by means of the surface inspection device 26.
- This allows local and immediately adjacent to a jet nozzle arrangement, for. B. in the form of a pair of rotor modules or a spray bar 38, it can be determined whether the desired surface quality for the workpiece 12 reaches a predetermined target value. If this is not the case, suitable control of the high-pressure pump unit 24 or of the / the frequency controller / s 25 provided for this purpose, the pressure with which the liquid 18 is supplied to the jet nozzles 16 can be increased by means of the control device 22, with a further pump of the high-pressure pump unit 24 possibly also being switched on.
- the operating parameters of the device 10 can also be adapted: by suitably actuating the high-pressure pump unit 24 by means of the control device 22, the pressure at which the liquid 18 is supplied to the jet nozzles 16 can be reduced until a recognizable residual scale falls below a minimal impact displays and then this pressure must be increased slightly again.
- the pressure for the jet nozzles 16 supplied liquid 18 is set to a sufficiently large value with which the surface quality reaches the predetermined target value.
- the impact pressure or the descaling pressure can be changed by adjusting the height of a jet nozzle arrangement.
- This height adjustment is in the Fig. 1 and in the Fig. 2 each symbolized by the arrow "H", and is achieved by the control device 22 suitably actuating the actuator of the height-adjustable holder H to which the jet nozzle arrangement is attached.
- the feed speed v of the workpiece 12 can be adapted to change the specific energy input E.
- the flow chart according to Fig. 5 illustrates a control loop in order to determine or set the desired specific energy input E with which the workpiece 12 is descaled.
- the abovementioned options are carried out or applied until the surface quality for the workpiece reaches a predetermined target value (in Fig. 5 referred to as the "target result").
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Description
Die Erfindung betrifft eine Vorrichtung zum Entzundern eines Werkstücks nach dem Oberbegriff von Anspruch 1 und ein entsprechendes Verfahren nach dem Oberbegriff von Anspruch 9.The invention relates to a device for descaling a workpiece according to the preamble of claim 1 and a corresponding method according to the preamble of claim 9.
Zum Entzundern von Werkstücken, insbesondere von Warmwalzgut, ist es nach dem Stand der Technik bekannt, auf die Oberflächen des Werkstücks Hochdruck-Wasser zu spritzen. Für ein lückenloses und somit vollständiges Entzundern der Oberflächen des Werkstücks wird das Hochdruck-Wasser in der Regel aus einer Mehrzahl von Düsen eines Zunderwäschers ausgespritzt. In diesem Zusammenhang wird als Zunderwäscher bei einer Warmwalzanlage eine Baugruppe bezeichnet, die zur Entfernung von Zunder, d. h. von Verunreinigungen aus Eisenoxid, von der Oberfläche des Warmwalzgutes vorgesehen ist.For descaling workpieces, in particular hot rolled material, it is known in the prior art to spray high-pressure water onto the surfaces of the workpiece. For a complete and therefore complete descaling of the surfaces of the workpiece, the high-pressure water is usually sprayed out of a plurality of nozzles in a scale washer. In this context, a scale washer in a hot rolling mill is an assembly that is used to remove scale, i.e. H. of impurities from iron oxide, is provided from the surface of the hot rolling stock.
Auf dem Gebiet der Warmwalzproduktion findet bislang eine Überwachung bzw. Inspektion der Oberflächen eines in einer Bewegungsrichtung transportierten Warmwalzgutes nur am Ende des Walzvorgangs statt. Hierbei wird ein Zunderwäscher, der vor bzw. bezogen auf der Bewegungsrichtung stromaufwärts von einem Endgerüst angeordnet ist, in der Regel mit maximalem Druck und Volumenstrom für das Hochdruck-Wasser betrieben. Dies erfolgt zu dem Zweck, an den Oberflächen des Warmwalzgutes eine möglichst intensive Entzunderung zu erzielen. Nachteilig bei einer solchen Betriebsweise eines Zunderwäschers ist der große Bedarf an Energie zur Erzeugung von Hochdruck-Wasser.In the field of hot rolling production, monitoring or inspection of the surfaces of a hot rolling stock transported in one direction of movement has only taken place at the end of the rolling process. Here, a scale washer, which is arranged upstream of or in relation to the direction of movement upstream of a final scaffold, is usually operated at maximum pressure and volume flow for the high-pressure water. This is done for the purpose of achieving the most descaling possible on the surfaces of the hot rolled material. A disadvantage of such a mode of operation of a scale washer is the great need for energy to produce high-pressure water.
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Bei den bislang bekannten Anlagen bzw. Verfahren zum Entzundern von Warmwalzgut ist erst am Ende der Walzstraße eine Oberflächeninspektion installiert. Eine solche Oberflächeninspektion ist räumlich weit von einem Zunderwäscher entfernt und insbesondere prozesstechnisch nicht mit dem Zunderwäscher verbunden. Falls mittels der Oberflächeninspektion festgestellt werden sollte, dass das Warmwalzgut Oberflächenfehler aufweist, sind bereits mehrere Produktionsschritte, insbesondere Walzvorgänge, durchlaufen worden. Dies hat zur Folge, dass eine saubere Zuordnung von möglichen Zunderfehlern zu den erkannten Oberflächenfehlern nicht oder nur eingeschränkt möglich ist. Anders ausgedrückt, gestaltet sich bei den bislang bekannten Anlagen zum Entzundern von Warmwalzgut eine sichere Identifikation von Oberflächenfehlern als Zunderreste mindestens schwierig, bis gar unmöglich. Jedenfalls unterliegen die bislang bekannten Ansätze zum Entzundern von Werkstücken dem Nachteil, dass eine Einordnung in Primär- und Sekundärzunderfehler sowie die Unterscheidung zwischen eingewalztem Restzunder in Folge einer zuvor unzureichenden Entzunderung und im Laufe des Walzprozesses herabgefallener Zunderbrocken nicht realisierbar ist.In the previously known systems and methods for descaling hot rolled material, a surface inspection is only installed at the end of the rolling train. Such a surface inspection is spatially far removed from a scale washer and, in particular in terms of process technology, is not connected to the scale washer. If it should be determined by means of the surface inspection that the hot rolled material has surface defects, several production steps, in particular rolling processes, have already been carried out. The consequence of this is that a clean assignment of possible scale defects to the detected surface defects is not possible or is only possible to a limited extent. In other words, in the systems for descaling hot rolled products known to date, it is at least difficult, if not impossible, to reliably identify surface defects as scale residues. In any case, the previously known approaches to descaling workpieces are subject the disadvantage that a classification into primary and secondary scale errors as well as the distinction between rolled-in residual scale due to a previously inadequate descaling and scale chips falling down in the course of the rolling process cannot be realized.
Der Erfindung liegt die Aufgabe zugrunde, dass Entzundern von Werkstücken hinsichtlich der Oberflächenqualität zu optimieren und dabei auch den Bedarf an Energie und Hochdruck-Flüssigkeit auf ein erforderliches Minimum zu senken.The object of the invention is to optimize the descaling of workpieces with regard to the surface quality and also to reduce the need for energy and high-pressure liquid to a necessary minimum.
Diese Aufgabe wird durch eine Vorrichtung zum Entzundern eines Werkstücks mit den im Anspruch 1 angegebenen Merkmalen, und durch ein Verfahren gemäß Anspruch 9 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen definiert.This object is achieved by a device for descaling a workpiece with the features specified in claim 1, and by a method according to claim 9. Advantageous developments of the invention are defined in the dependent claims.
Die Erfindung sieht eine Vorrichtung zum Entzundern eines Werkstücks vor, vorzugsweise ein Warmwalzgut, das relativ zur Vorrichtung in einer Bewegungsrichtung bewegt wird. Zu diesem Zweck umfasst die Vorrichtung zumindest eine erste Strahldüsen-Anordnung mit einer Mehrzahl von Strahldüsen, aus denen eine Flüssigkeit, insbesondere Wasser, auf eine Oberfläche des Werkstücks unter Hochdruck ausgebracht werden kann. Des Weiteren umfasst die Vorrichtung eine Steuereinrichtung und eine mit der Steuereinrichtung signaltechnisch verbundene Oberflächeninspektionseinrichtung, die in Bezug auf die Bewegungsrichtung des Werkstücks stromabwärts von der Strahldüsen-Anordnung angeordnet ist und eine Detektion von Zunder auf der Oberfläche des Werkstücks ermöglicht. Die Oberflächeninspektionseinrichtung ist unmittelbar angrenzend zur Strahldüsen-Anordnung angeordnet. Die Steuereinrichtung ist programmtechnisch derart eingerichtet, dass der spezifische Energieeintrag, mit dem eine Oberfläche des Werkstücks durch die aus den Strahldüsen ausgebrachte Flüssigkeit beaufschlagt wird, mittels der Steuereinrichtung in Abhängigkeit der Signale der Oberflächeninspektionseinrichtung regelbar ist, und dass auf Grundlage der Signale der Oberflächeninspektionseinrichtung eine Oberflächenqualität für das Werkstück bestimmt und mit einem vorbestimmten Sollwert verglichen wird. Hierbei wird der spezifische Energieeintrag derart geregelt, dass er erhöht wird, falls die Oberflächenqualität des Werkstücks den vorbestimmten Sollwert unterschreitet, und dass er vermindert wird, falls die Oberflächenqualität des Werkstücks den vorbestimmten Sollwert überschreitet.The invention provides a device for descaling a workpiece, preferably a hot rolled product, which is moved relative to the device in one direction of movement. For this purpose, the device comprises at least one first jet nozzle arrangement with a plurality of jet nozzles, from which a liquid, in particular water, can be applied to a surface of the workpiece under high pressure. Furthermore, the device comprises a control device and a surface inspection device connected to the control device by means of signals, which is arranged downstream of the jet nozzle arrangement with respect to the direction of movement of the workpiece and enables the detection of scale on the surface of the workpiece. The surface inspection device is arranged directly adjacent to the jet nozzle arrangement. In terms of programming, the control device is set up in such a way that the specific energy input with which a surface of the workpiece is acted upon by the liquid discharged from the jet nozzles can be regulated by means of the control device as a function of the signals of the surface inspection device, and that a surface quality is based on the signals of the surface inspection device determined for the workpiece and compared with a predetermined target value. Here, the specific energy input regulated in such a way that it is increased if the surface quality of the workpiece falls below the predetermined target value and is decreased if the surface quality of the workpiece exceeds the predetermined target value.
In gleicher Weise sieht die Erfindung ein Verfahren zum Entzundern eines Werkstücks, vorzugsweise eines Warmwalzgutes, vor, welches relativ zu einer Strahldüsen-Anordnung mit einer Mehrzahl von Strahldüsen in einer Bewegungsrichtung bewegt wird. Zum Entzundern des Werkstücks wird eine Flüssigkeit, insbesondere Wasser, aus den Strahldüsen unter Hochdruck auf eine Oberfläche des Werkstücks gespritzt. Zur Durchführung des Verfahrens ist eine Steuereinrichtung vorgesehen, die mit der Strahldüsen-Anordnung und mit einer Oberflächeninspektions-Einrichtung jeweils signaltechnisch verbunden ist. Mittels der Oberflächeninspektionseinrichtung wird eine Oberfläche des Werkstücks- in Bezug auf die Bewegungsrichtung des Werkstücks - stromabwärts von der Strahldüsen-Anordnung, und unmittelbar angrenzend an die Strahldüsen-Anordnung überprüft. Der spezifische Energieeintrag, mit dem eine Oberfläche des Werkstücks durch die aus den Strahldüsen ausgebrachte Flüssigkeit beaufschlagt wird, wird mittels der Steuereinrichtung in Abhängigkeit der Signale der Oberflächeninspektionseinrichtung geregelt, wobei auf Grundlage der Signale der Oberflächeninspektionseinrichtung eine Oberflächenqualität für das Werkstück bestimmt und mit einem vorbestimmten Sollwert verglichen wird. Hierbei wird der spezifische Energieeintrag derart geregelt, dass er erhöht wird, falls die Oberflächenqualität des Werkstücks den vorbestimmten Sollwert unterschreitet, und dass er vermindert wird, falls die Oberflächenqualität des Werkstücks den vorbestimmten Sollwert überschreitet.In the same way, the invention provides a method for descaling a workpiece, preferably a hot rolled product, which is moved in one direction of movement relative to a blasting nozzle arrangement with a plurality of blasting nozzles. To descale the workpiece, a liquid, in particular water, is sprayed from the jet nozzles onto a surface of the workpiece under high pressure. To carry out the method, a control device is provided which is connected to the jet nozzle arrangement and to a surface inspection device in terms of signal technology. By means of the surface inspection device, a surface of the workpiece is checked with respect to the direction of movement of the workpiece - downstream of the jet nozzle arrangement and immediately adjacent to the jet nozzle arrangement. The specific energy input with which a surface of the workpiece is acted upon by the liquid discharged from the jet nozzles is regulated by the control device as a function of the signals from the surface inspection device, a surface quality for the workpiece being determined on the basis of the signals from the surface inspection device and with a predetermined target value is compared. Here, the specific energy input is regulated in such a way that it is increased if the surface quality of the workpiece falls below the predetermined target value, and is reduced if the surface quality of the workpiece exceeds the predetermined target value.
Der Erfindung liegt die wesentliche Erkenntnis zugrunde, dass eine Oberflächeninspektionseinrichtung ortsnah zur Strahldüsen-Anordnung angeordnet ist. Diesbezüglich bedeutet das Merkmal "ortsnah" im Sinne der vorliegenden Erfindung, dass die Oberflächeninspektionseinrichtung - in Bezug auf die Bewegungsrichtung, mit der das Werkstück an der Strahldüsen-Anordnung mit einer Vorschubgeschwindigkeit vorbeibewegt wird - stromabwärts von der Strahldüsen-Anordnung und unmittelbar angrenzend hierzu positioniert ist. Hierdurch ist es möglich, das Ergebnis der Beaufschlagung der Oberflächen des Werkstücks mit einer Flüssigkeit unter Hochdruck und die daraus resultierende Entzunderungsqualität zu überwachen und ggf. zu beeinflussen, insbesondere bevor das Werkstück weitere Produktionsschritte wie z. B. weitere Walzvorgänge durchläuft. Auf Grundlage der Signale der Oberflächeninspektions-Einrichtung wird somit eine Führungsgröße gewonnen, mit der anschließend eine bedarfsangepasste Steuerung des spezifischen Energieeintrags möglich ist, mit dem eine Entzunderung des Werkstücks erzielt wird.The invention is based on the essential finding that a surface inspection device is arranged close to the jet nozzle arrangement. In this regard, the feature "close to location" in the sense of the present invention means that the surface inspection device - in relation to the direction of movement with which the workpiece is moved past the jet nozzle arrangement at a feed rate - is positioned downstream of the jet nozzle arrangement and immediately adjacent thereto . This makes it possible to see the result of the Applying a liquid under high pressure to the surfaces of the workpiece and to monitor and, if necessary, influence the resulting descaling quality, in particular before the workpiece undergoes further production steps such. B. undergoes further rolling operations. On the basis of the signals from the surface inspection device, a reference variable is thus obtained, with which subsequently a customized control of the specific energy input is possible, with which descaling of the workpiece is achieved.
Der spezifische Energieeintrag bestimmt sich nach der vorliegenden Erfindung aus dem Aufpralldruck [engl.: Impact], mit dem die Flüssigkeit auf eine Oberfläche des Werkstücks auftrifft, sowie dem spezifischen Volumenstrom pro Breite des Werkstücks, d.h. dem Volumenstrom der auf das Werkstück gespritzten Flüssigkeit dividiert durch die Spritzbreite bezogen auf die Bewegungsrichtung des Werkstücks. Der Aufpralldruck ist abhängig von dem Druck, mit dem die Flüssigkeit den Strahldüsen zugeführt wird, dem ausgespritzten Volumenstrom, und dem Abstand der Strahldüsen von der Oberfläche des Werkstücks. Des Weiteren ist der spezifische Energieeintrag abhängig von der Vorschubgeschwindigkeit, mit der das Werkstück in der Bewegungsrichtung bewegt wird. Eine Veränderung des spezifischen Energieeintrags, in Abhängigkeit der Signale der Oberflächeninspektionseinrichtung kann durch eine Anpassung der vorstehend genannten Parameter erfolgen, nämlich mittels der Steuereinrichtung, wie nachfolgend noch im Detail erläutert.The specific energy input is determined according to the present invention from the impact pressure with which the liquid impinges on a surface of the workpiece, and the specific volume flow per width of the workpiece, i.e. the volume flow of the liquid sprayed onto the workpiece divided by the spray width in relation to the direction of movement of the workpiece. The impact pressure is dependent on the pressure with which the liquid is supplied to the jet nozzles, the volume flow sprayed out, and the distance of the jet nozzles from the surface of the workpiece. Furthermore, the specific energy input depends on the feed rate at which the workpiece is moved in the direction of movement. The specific energy input, depending on the signals of the surface inspection device, can be changed by adapting the parameters mentioned above, namely by means of the control device, as will be explained in detail below.
Erfindungsgemäß ist die Steuerungseinrichtung programmtechnisch derart eingerichtet, dass auf Grundlage der Signale der Oberflächeninspektions-Einrichtung eine Regelung des spezifischen Energieeintrags erfolgt. Zu diesem Zweck wird mittels der Steuereinrichtung, nämlich auf Grundlage der Signale der Oberflächeninspektionseinrichtung, eine Oberflächenqualität für das Werkstück bestimmt und dann mit einem vorbestimmten Sollwert verglichen. Falls im Anschluss daran mittels der Steuereinrichtung festgestellt wird, dass die Oberflächenqualität des Werkstücks den vorbestimmten Sollwert unterschreitet, wird sodann der spezifische Energieeintrag erhöht. Im Umkehrschluss bedeutet dies, dass, falls die Oberflächenqualität des Werkstücks den vorbestimmten Sollwert überschreitet, dann der spezifische Energieeintrag entsprechend vermindert wird. Eine solche Einstellung bzw. Anpassung des spezifischen Energieeintrags, auf Basis der Signale der Oberflächeninspektionseinrichtung, erfolgt nach einer bevorzugten Ausführungsform der Erfindung geregelt, d. h. durch Vorsehen eines entsprechenden Regelkreises in der Steuereinrichtung.According to the invention, the control device is set up in terms of program technology in such a way that the specific energy input is regulated on the basis of the signals of the surface inspection device. For this purpose, the control device, namely on the basis of the signals from the surface inspection device, determines a surface quality for the workpiece and then compares it with a predetermined target value. If it is subsequently determined by means of the control device that the surface quality of the workpiece falls below the predetermined target value, the specific energy input is then increased. Conversely, this means that if the surface quality of the workpiece exceeds the predetermined target value, then the specific energy input is reduced accordingly. Such a setting or adaptation of the specific energy input, based on the signals of the surface inspection device, is carried out in a controlled manner according to a preferred embodiment of the invention, ie by providing a corresponding control loop in the control device.
Als Stellglieder zur Steuerung und/oder Regelung des spezifischen Energieeintrags stehen der Systemdruck der Entzunderung, die Höhenverstellung der Strahldüsen, d.h. die Veränderung des Abstands der Strahldüsen zur Oberfläche des Werkstücks, die Zu-/Abschaltung einer zusätzlichen Strahldüsen-Anordnung, und die Vorschubgeschwindigkeit des Werkstücks zur Verfügung.The actuators for controlling and / or regulating the specific energy input are the system pressure of the descaling, the height adjustment of the jet nozzles, i.e. the change in the distance of the jet nozzles to the surface of the workpiece, the connection / disconnection of an additional jet nozzle arrangement, and the feed speed of the workpiece to disposal.
Zur soeben genannten Verminderung des spezifischen Energieeintrags, nämlich für den Fall, dass die mittels der Oberflächeninspektionseinrichtung festgestellte Oberflächenqualität des Werkstücks einen vorbestimmten Sollwert überschreitet, wird vorteilhaft eine geringere Menge an Hochdruck-Flüssigkeit benötigt, und dadurch auch eine verminderte Abkühlung des Werkstücks erzielt. Eine solche verminderte Abkühlung kann zur Senkung einer Ofentemperatur oder zur Senkung des Energiebedarfs für einen nachfolgenden Walzprozess, d. h. stromabwärts von der Strahldüsen-Anordnung, genutzt werden. Des Weiteren wird durch eine verminderte Abkühlung des Werkstücks die Endtemperatur des Produkts erhöht, wodurch das Produktspektrum auf geringere Enddücken ausgeweitet werden kann.In order to reduce the specific energy input just mentioned, namely in the event that the surface quality of the workpiece ascertained by means of the surface inspection device exceeds a predetermined target value, a smaller amount of high-pressure liquid is advantageously required, and thereby a reduced cooling of the workpiece is also achieved. Such reduced cooling can be used to lower a furnace temperature or to lower the energy requirement for a subsequent rolling process, i. H. downstream of the jet nozzle arrangement. Furthermore, the final temperature of the product is increased by a reduced cooling of the workpiece, as a result of which the product range can be expanded to lower final pressures.
Wie erläutert, führt eine mögliche Senkung des spezifischen Energieeintrags bzw. des Entzunderungsdrucks, jedenfalls bis auf einen Druckwert, der gerade noch hinreichend ist, um den vorbestimmten Sollwert für die Oberflächenqualität des Werkstücks zu erreichen, zu dem Vorteil eines geringeren Energiebedarfs zur Erzeugung der Hochdruck-Flüssigkeit für die Entzunderung. Im Zuge dessen wird vorteilhaft auch der Verschleiß von Anlagenkomponenten der erfindungsgemäßen Vorrichtung bzw. der gesamten Entzunderungsanlage gesenkt. Dies betrifft sowohl die Strahldüsen selbst, als auch in hohem Maße die damit verbundenen Pumpen sowie Rohrleitungen und alle medienberührten Teile. Hinzu kommt noch der Vorteil von verlängerten Wartungsintervallen und somit von geringeren Wartungskosten, bedingt durch eine verminderte Abrasionswirkung der Hochdruck-Flüssigkeit auf alle umgebenden Materialien durch den verminderten Druck.As explained, a possible reduction in the specific energy input or the descaling pressure, at least to a pressure value that is just sufficient to achieve the predetermined target value for the surface quality of the workpiece, leads to the advantage of a lower energy requirement for generating the high pressure Descaling liquid. In the course of this, the wear on system components of the device according to the invention or of the entire descaling system is also advantageously reduced. This applies both to the jet nozzles themselves and to a large extent to the pumps, pipelines and all parts that come into contact with the media. In addition, there is the advantage of extended maintenance intervals and thus of lower maintenance costs, due to a reduced abrasion effect of the high-pressure liquid on all surrounding materials due to the reduced pressure.
Durch eine Regelung des spezifischen Energieeintrags ist es möglich, auf detektierte Oberflächenfehler des Werkstücks, d. h. auf verbleibenden Restzunder auf dem Werkstück, unmittelbar zu reagieren, nämlich durch eine geeignete Erhöhung des spezifischen Energieeintrags durch die zuvor genannten Stellglieder . Hierdurch kann wirkungsvoll vermieden werden, dass Restzunder bei weiteren Produktionsschritten wie insbesondere Walzvorgängen, die sich für das Werkstück stromabwärts der Strahldüsen-Anordnung anschließen, in die Oberfläche des Werkstücks eingewalzt wird. Zusätzlich zur Einhaltung einer gewünschten Qualitätsgüte für das Werkstück lässt sich hierdurch vermeiden, dass Teile der Produktion - falls nämlich z. B. Restzunder nicht erkannt bzw. beseitigt werden würde - verschrottet werden muss.By regulating the specific energy input, it is possible to react immediately to detected surface defects of the workpiece, ie to remaining scale on the workpiece, namely by a suitable increase in the specific energy input by the actuators mentioned above. This can effectively avoid that residual scale Further production steps such as, in particular, rolling processes which follow the workpiece downstream of the jet nozzle arrangement are rolled into the surface of the workpiece. In addition to maintaining a desired quality level for the workpiece, this can avoid that parts of the production - if z. B. residual scale would not be recognized or removed - must be scrapped.
In vorteilhafter Weiterbildung der Erfindung umfasst die Vorrichtung eine mit der Steuereinrichtung signaltechnisch verbundene Hochdruckpumpeneinheit, die mit den Strahldüsen der Strahldüsen-Anordnung in Fluidverbindung steht. Diese Hochdruckpumpeneinheit kann mittels der Steuereinrichtung gesteuert, vorzugsweise geregelt, werden, um den Druck, mit dem die Flüssigkeit den Strahldüsen zugeführt wird, zu verändern. In Folge dieses veränderten Drucks für die Flüssigkeit ändert sich entsprechend auch der Entzunderungs- bzw. Aufpralldruck, mit dem die Flüssigkeit auf einer Oberfläche des Werkstücks aufprallt, um dieses wie gewünscht zu entzundern. Im Hinblick auf die vorstehend erläuterte Abhängigkeit ändert sich hierdurch auch der spezifische Energieeintrag, mit dem die Flüssigkeit auf die Oberfläche des Werkstücks aufgebracht wird.In an advantageous development of the invention, the device comprises a high-pressure pump unit which is connected to the control device by means of signals and is in fluid communication with the jet nozzles of the jet nozzle arrangement. This high-pressure pump unit can be controlled, preferably regulated, by means of the control device in order to change the pressure with which the liquid is supplied to the jet nozzles. As a result of this changed pressure for the liquid, the descaling or impact pressure with which the liquid bounces on a surface of the workpiece also changes accordingly in order to descale the workpiece as desired. In view of the dependency explained above, this also changes the specific energy input with which the liquid is applied to the surface of the workpiece.
Die Hochdruckpumpeneinheit kann über eine Mehrzahl von einzelnen Pumpen verfügen. Bei einer Ansteuerung der Hochdruckpumpeneinheit mittels der Steuereinrichtung kann vorgesehen sein, dass im Falle einer Druckerhöhung eine weitere Pumpe hinzugeschaltet wird, oder dass im Falle einer gewünschten Druckverminderung eine der eingesetzten Pumpen abgeschaltet wird.The high pressure pump unit can have a plurality of individual pumps. When the high-pressure pump unit is activated by means of the control device, it can be provided that a further pump is switched on in the event of a pressure increase, or that one of the pumps used is switched off in the event of a desired pressure reduction.
In vorteilhafter Weiterbildung der Erfindung kann die Hochdruckpumpeneinheit mit zumindest einem Frequenzregler, oder vorzugsweise mit mehreren Frequenzreglern, ausgestattet sein. Eine Pumpe oder die Pumpen der Hochdruckpumpeneinheit ist/sind über diesen Frequenzregler an ein elektrisches Versorgungsnetz angeschlossen, wobei der jeweilige Frequenzregler steuerungstechnisch mit der Steuereinrichtung verbunden ist. Entsprechend ist es möglich, den Frequenzregler der Hochdruckpumpeneinheit mittels der Steuereinrichtung derart zu steuern oder zu regeln, dass dadurch der Druck, mit dem die Flüssigkeit den Strahldüsen einer Strahldüsen-Anordnung zugeführt wird, auch in geringem Maße bzw. mit kleinen Abstufungen, vorzugsweise auch stufenlos, eingestellt bzw. verändert werden kann.In an advantageous development of the invention, the high-pressure pump unit can be equipped with at least one frequency regulator, or preferably with a plurality of frequency regulators. A pump or the pumps of the high-pressure pump unit is / are connected to an electrical supply network via this frequency controller, the respective frequency controller being connected to the control device in terms of control technology. Accordingly, it is possible to control or regulate the frequency controller of the high-pressure pump unit by means of the control device such that the pressure with which the liquid is supplied to the jet nozzles of a jet nozzle arrangement is also set or changed to a small extent or with small increments, preferably also continuously can be.
Ergänzend oder alternativ kann nach einer vorteilhaften Weiterbildung der Erfindung vorgesehen sein, dass ein Abstand, den die Strahldüsen-Anordnung zur Oberfläche des Werkstücks aufweist, mittels der Steuereinrichtung gesteuert, vorzugsweise geregelt, verändert wird, nämlich in Abhängigkeit der Signale der Oberflächeninspektionseinrichtung. Dies kann dadurch erfolgen, dass die Strahldüsen-Anordnung an einer höhenverstellbaren Halterung mit einem Stellantrieb angebracht ist, wobei der Stellantrieb mit der Steuereinrichtung signaltechnisch verbunden ist. Falls die von der Steuereinrichtung auf Grundlage der Signale der Oberflächeninspektionseinrichtung ermittelte Oberflächenqualität einen vorbestimmten Sollwert unterschreiten sollte, kann durch eine geeignete Ansteuerung des Stellantriebs mittels der Steuereinrichtung der Abstand der Strahldüsen-Anordnung zur Oberfläche des Werkstücks verringert werden, mit der Folge, dass dadurch der Aufpralldruck der Flüssigkeit bzw. der Entzunderungsdruck zunimmt. Diesbezüglich versteht sich, dass eine solche Veränderung des Abstands der Strahldüsen-Anordnung nur in dem Maße erfolgt, wie auch ein gewünschtes Spritzbild der Strahldüsen auf der Oberfläche des Werkstücks beibehalten bleibt.Additionally or alternatively, according to an advantageous development of the invention, it can be provided that a distance which the jet nozzle arrangement has from the surface of the workpiece is controlled, preferably regulated, changed by means of the control device, namely as a function of the signals of the surface inspection device. This can be done in that the jet nozzle arrangement is attached to a height-adjustable holder with an actuator, the actuator being signal-connected to the control device. If the surface quality determined by the control device on the basis of the signals from the surface inspection device falls below a predetermined target value, the distance between the jet nozzle arrangement and the surface of the workpiece can be reduced by suitable control of the actuator by means of the control device, with the result that the impact pressure is thereby reduced the liquid or the descaling pressure increases. In this regard, it goes without saying that such a change in the spacing of the jet nozzle arrangement takes place only to the extent that a desired spray pattern of the jet nozzles remains on the surface of the workpiece.
In vorteilhafter Weiterbildung der Erfindung kann zur Anpassung des spezifischen Energieantrags nach Maßgabe der Steuereinrichtung die Vorschubgeschwindigkeit des Werkstücks angepasst werden, sofern es der Gesamtprozess zulässt.In an advantageous development of the invention, the feed rate of the workpiece can be adapted to adapt the specific energy application in accordance with the control device, provided that the overall process allows it.
Durch Zunder- oder andere Partikel kommt es gelegentlich zum Verstopfen einzelner Strahldüsen. Nach dem bislang bekannten Stand der Technik kann dies erst zu einem viel späteren Zeitpunkt durch Zunderfehler bei der Endüberwachung festgestellt werden, verbunden mit dem Nachteil, dass bis dahin bereits einige Tonnen von Warmwalzgut bzw. Stahl fehlerbehaftet hergestellt worden sind. Demgegenüber kann eine solche Verstopfung einer Strahldüse durch eine direkte Überwachung des Entzunderungsergebnisses, nämlich auf Grundlage der Signale der Oberflächeninspektionseinrichtung, die ortsnah zur Strahldüsen-Anordnung angeordnet ist, unmittelbar nach der Entstehung dieses Fehlers erkannt und ein entsprechendes Wartungssignal an die Steuereinrichtung bzw. eine Leitstelle ausgegeben werden.Scale or other particles occasionally block individual jet nozzles. According to the prior art known so far, this can only be done at a much later point in time due to scale errors in the final monitoring are found, combined with the disadvantage that a few tons of hot rolled steel or steel have already been produced with errors. In contrast, such a blockage of a jet nozzle can be recognized directly after the occurrence of this error by a direct monitoring of the descaling result, namely on the basis of the signals of the surface inspection device, which is arranged close to the jet nozzle arrangement, and a corresponding maintenance signal can be output to the control device or a control center become.
Ein weiterer Vorteil der vorliegenden Erfindung besteht darin, dass es dank eines verlässlichen Signals für die Oberflächengüte bzw. Oberflächenqualität des Werkstücks, die unmittelbar stromabwärts der Strahldüsen-Anordnung detektiert wird, möglich ist, für die Vorrichtung lediglich ein einziges Paar einer Strahldüsen-Anordnung, d. h. oberhalb und unterhalb des Werkstücks, vorzusehen. Anders ausgedrückt, kann eine erfindungsgemäße Vorrichtung auf ein solches Paar von Strahldüsen-Anordnungen beschränkt werden, wodurch erhebliche Investitionskosten für die ebenfalls reduzierte Hochdruckpumpeneinheit und zugehörige Verbindungsrohrleitungen eingespart werden können. Hieraus resultiert wiederum eine Platzeinsparung für die Hochdruckpumpeneinheit, eine Kürzung des Rollganges sowie eine Entlastung der Wasserwirtschaft, welche die Hochdruckpumpeneinheit mit Flüssigkeit versorgt.Another advantage of the present invention is that, thanks to a reliable signal for the surface quality or surface quality of the workpiece, which is detected immediately downstream of the jet nozzle arrangement, it is possible for the device to use only a single pair of a jet nozzle arrangement, i . H. above and below the workpiece. In other words, a device according to the invention can be limited to such a pair of jet nozzle arrangements, as a result of which considerable investment costs for the likewise reduced high-pressure pump unit and associated connecting pipelines can be saved. This in turn results in a space saving for the high-pressure pump unit, a reduction in the roller table and a relief of the water management, which supplies the high-pressure pump unit with liquid.
Nachstehend sind Ausführungsformen der Erfindung anhand der schematisch vereinfachten Zeichnung im Detail beschrieben. Es zeigen:
- Fig. 1
- eine prinzipiell vereinfachte Seitenansicht einer erfindungsgemäßen Vorrichtung,
- Fig. 2
- eine prinzipiell vereinfachte Seitenansicht einer Strahldüsen-Anordnung nach einer weiteren Ausführungsform der Erfindung,
- Fig. 3
- eine prinzipiell vereinfachte Draufsicht auf eine erfindungsgemäße Vorrichtung nach einer weiteren Ausführungsform,
- Fig. 4
- eine vereinfachte Seitenansicht eines Rotorkopf-Paars, das Teil einer Vorrichtung von
Fig. 3 sein kann, und - Fig. 5
- ein Ablaufdiagramm zur Ausführung der vorliegenden Erfindung.
- Fig. 1
- a principally simplified side view of a device according to the invention,
- Fig. 2
- a basically simplified side view of a jet nozzle arrangement according to a further embodiment of the invention,
- Fig. 3
- a basically simplified top view of a device according to the invention according to a further embodiment,
- Fig. 4
- a simplified side view of a pair of rotor heads, part of an apparatus of
Fig. 3 can be, and - Fig. 5
- a flowchart for carrying out the present invention.
Nachfolgend werden unter Bezugnahme auf die
Eine erfindungsgemäße Vorrichtung 10 dient zum Entzundern eines Werkstücks 12, das relativ zur Vorrichtung 10 in einer Bewegungsrichtung X bewegt wird. Bei dem Werkstück kann es sich um Warmwalzgut handeln, das an der Vorrichtung 10 vorbeibewegt wird. Eine Vorschubgeschwindigkeit, mit der das Werkstück 12 an der Vorrichtung 10 in der Bewegungsrichtung X vorbeibewegt wird, ist in
Eine erfindungsgemäße Vorrichtung 10 weist eine Strahldüsen-Anordnung mit einer Mehrzahl von Strahldüsen auf, aus denen eine Flüssigkeit, insbesondere Wasser, auf eine Oberfläche eines Werkstücks unter hohem Druck ausgespritzt wird. Die Strahldüsen-Anordnung kann aus einem um eine Rotationsachse drehbaren Rotorkopf (
Die erfindungsgemäße Vorrichtung 10 umfasst bei der Ausführungsform von
Die Strahldüsen 16 sind bei der Ausführungsform von
Die Strahldüsen 16 sind höhenverstellbar ausgebildet, z.B. durch Anbringung an einer höhenverstellbaren Halterung, die in der
Die Vorrichtung 10, wie z.B. für die Ausführungsform von
Die Hochdruckpumpeneinheit 24 ist mit einem Frequenzregler 25 ausgestattet. Hierdurch ist es möglich, die Hochdruckpumpeneinheit 24 mittels der Steuereinrichtung 22 insbesondere stufenlos anzusteuern, um einen Druck, mit dem die Flüssigkeit 18 den Strahldüsen 16 zugeführt wird, auch in kleinen Schritten verändern zu können. Weitere Details für eine solche Ansteuerung der Hochdruckpumpeneinheit 24 werden nachfolgend noch im Detail dargelegt.The high-
Die Vorrichtung 10 umfasst eine Oberflächeninspektionseinrichtung 26, die - bezogen auf die Bewegungsrichtung X des Werkstücks 12 - stromabwärts von dem Rotorkopf 14 und ortsnah hierzu angeordnet ist. Die Oberflächeninspektionseinrichtung 26 kann auf einem spezialisierten optischem Messprinzip basieren, bei dem für eine Oberfläche 20 des Werkstücks 12 eine 3D-Messung erfolgt und hieraus ein Höhenprofil für die Oberfläche 20 des Werkstücks 12 abgeleitet wird. Alternativ wird mittels der Oberflächeninspektionseinrichtung 26 eine Spektralanalyse an der Oberfläche 20 des Werkstücks 12 durchgeführt. Die Oberflächeninspektionseinrichtung 26 ist ebenfalls signaltechnisch mit der Steuereinrichtung 22 verbunden. Somit kann mittels der Oberflächeninspektionseinrichtung 26 und einer entsprechenden Auswertung in der Steuereinrichtung 22 Zunder bzw. Restzunder auf der Oberfläche 20 des Werkstücks 12 detektiert werden. Zu diesem Zweck ist die Oberflächeninspektionseinrichtung 26 derart ausgebildet, dass sowohl eine Oberseite als auch eine Unterseite des Werkstücks 12 überwacht werden.The
Die signaltechnische Verbindung zwischen der Steuereinrichtung 22 und der Hochdruckpumpeneinheit 24 ist in der
In Bezug auf die Steuereinrichtung 22, die Hochdruckpumpeneinheit 24 und die Oberflächeninspektionseinrichtung 26 gelten für die Ausführungsform von
Bezüglich der Ausführungsform von
Nachstehend sind unter Bezugnahme auf die
Für die Darstellung von
Bezüglich der Ausführungsformen nach den
Bei der Ausführungsform von
Nach einer weiteren Ausführungsform der Erfindung kann auch eine separate Oberflächenabtasteinheit 40 (
Bei allen der vorstehend genannten Ausführungsformen wird das Werkstück 12 an der Vorrichtung 10 vorbeibewegt, nämlich mit einer Vorschubgeschwindigkeit, die in den entsprechenden Figuren jeweils mit "v" symbolisiert ist. Durch das Aufspritzen von Wasser unter Hochdruck werden die Oberflächen 20 des Werkstücks 12 mit einem spezifischen Energieeintrag E (bzw. "Spray Energy") beaufschlagt, der sich wie folgt bestimmt:
Hierin bedeuten:
- E:
- Spezifischer Energieeintrag [kJ/m2]
- I:
- Aufpralldruck [N/mm2]
- V̇spez:
- Spezifischer Volumenstrom pro m Breite des Werkstücks [l/s•m]
- v:
- Vorschubgeschwindigkeit des Werkstücks [m/s]
- E:
- Specific energy input [kJ / m 2 ]
- I:
- Impact pressure [N / mm 2 ]
- V̇ spec :
- Specific volume flow per m width of the workpiece [l / s • m]
- v:
- Workpiece feed speed [m / s]
Hierbei ist der Aufpralldruck [engl.: Impact], mit dem die Flüssigkeit 18 auf die Oberfläche 20 des Werkstücks 12 auftrifft, abhängig sowohl von dem Druck und dem Volumen, mit dem die Flüssigkeit aus den Strahldüsen 16 ausgespritzt wird, als auch von dem Abstand der Strahldüsen 16 von der Oberfläche 20 des Werkstücks.Here, the impact pressure with which the liquid 18 impinges on the
Ohne Berücksichtigung der Vorschubgeschwindigkeit v erfolgt lediglich eine stationäre Betrachtung des Aufpralldrucks I, der für eine Regelung des Entzunderungsergebnisses unzureichend ist.Without taking the feed rate v into account, there is only a stationary consideration of the impact pressure I, which is insufficient for regulating the descaling result.
Des Weiteren bestimmt sich der spezifische Volumenstrom V̇spez zu:
Hierin bedeuten:
- V̇spez:
- Spezifischer Volumenstrom pro m Breite des Werkstücks [l/s•m]
- V̇:
- Volumenstrom der ausgespritzen Flüssigkeit [l/s]
- b:
- Spritzbreite quer zur Bewegungsrichtung X [m]
- V̇ spec :
- Specific volume flow per m width of the workpiece [l / s • m]
- V̇:
- Volume flow of the ejected liquid [l / s]
- b:
- Spray width across the direction of movement X [m]
Die Erfindung funktioniert nun wie folgt:
Für ein gewünschtes Entzundern der Oberflächen 20 des Werkstücks 12 wird dieses relativ zur erfindungsgemäßen Vorrichtung 10 in der Bewegungsrichtung X bewegt. Hierbei wird aus den Strahldüsen 16 die Flüssigkeit 18 unter Hochdruck auf die Oberflächen 20 des Werkstücks 12 gespritzt, nämlich sowohl an dessen Oberseite als auch an dessen Unterseite.The invention now works as follows:
For a desired descaling of the
Unter Bezugnahme auf die vorstehend genannten Gleichungen und der dazu erläuterten Zusammenhänge kann der spezifische Energieeintrag E z.B. erhöht werden, indem der Druck, mit dem die Flüssigkeit den Strahldüsen zugeführt wird, und/oder der Volumenstrom V erhöht werden, und/oder indem der Abstand A der Strahldüsen zur Oberfläche 20 des Werkstücks 12 und/oder die Vorschubgeschwindigkeit v vermindert werden, und/oder indem eine weitere Strahldüsen-Anordnung zugeschaltet wird. Mutatis mutandis gilt dies auch umgekehrt: Eine Verminderung des spezifischen Energieeintrags E wird dadurch erreicht, indem der Druck, mit dem die Flüssigkeit den Strahldüsen zugeführt wird, und/oder der Volumenstrom V verringert werden, und/oder indem der Abstand A der Strahldüsen zur Oberfläche 20 des Werkstücks und/oder die Vorschubgeschwindigkeit v vergrößert werden, und/oder indem eine weitere Strahldüsen-Anordnung abgeschaltet wird.With reference to the above-mentioned equations and the relationships explained thereon, the specific energy input E can be increased, for example, by increasing the pressure with which the liquid is supplied to the jet nozzles and / or the volume flow V, and / or by increasing the distance A of the jet nozzles to the
Eine Erhöhung des spezifischen Energieeintrags E erfolgt nach der vorliegenden Erfindung z.B. für den Fall, dass auf Grundlage der Signale der Oberflächeninspektionseinrichtung 26 mittels der Steuereinrichtung 22 bestimmt wird, dass die Oberflächenqualität des Werkstücks 12 einen vorbestimmten Sollwert unterschreitet. Im Umkehrschluss bedeutet dies, dass der spezifische Energieeintrag E solange vermindert wird, solange die Oberflächenqualität des Werkstücks 12 einen vorbestimmten Sollwert einhält.According to the present invention, an increase in the specific energy input E takes place e.g. in the event that it is determined on the basis of the signals from the
Insbesondere bei einer Primärentzunderung des Werkstücks 12 kann es sich empfehlen, den spezifischen Energieeintrag E, wie erläutert auf Grundlage der Signale der Oberflächeninspektionseinrichtung 26, vorzusgweise allein durch eine Veränderung der Vorschubgeschwindigkeit v einzustellen.In particular in the case of primary descaling of the
Während sich das Werkstück 12 an der Vorrichtung 10 in der Bewegungsrichtung X vorbeibewegt und dabei entzundert wird, wird die Entzunderungsqualität fortwährend mittels der Oberflächeninspektionseinrichtung 26 überwacht. Hierdurch kann ortsnah und unmittelbar angrenzend an eine Strahldüsen-Anordnung, z. B. in Form eines Rotormodul-Paars oder eines Spritzbalken-Paars 38, festgestellt werden, ob die gewünschte Oberflächenqualität für das Werkstück 12 einen vorbestimmten Sollwert erreicht. Sollte dies nicht der Fall sein, so kann durch eine geeignete Ansteuerung der Hochdruckpumpeneinheit 24 bzw. des/der dafür vorgesehenen Frequenzregler/s 25 mittels der Steuereinrichtung 22 der Druck, mit dem die Flüssigkeit 18 den Strahldüsen 16 zugeführt wird, erhöht werden, wobei ggf. auch eine weitere Pumpe der Hochdruckpumpeneinheit 24 zugeschaltet wird.While the
Ergänzend oder alternativ zu der bereits genannten Anpassung des Drucks ist es auch möglich, eine zusätzliche Strahldüsen-Anordnung zuzuschalten. Bei der Ausführungsform gemäß
Gemäß dem Ablaufdiagramm von
Ergänzend und/oder alternativ kann die Veränderung des Aufpralldrucks bzw. des Entzunderungsdrucks durch eine Höhenverstellung einer Strahldüsen-Anordnung erfolgen. Diese Höhenverstellung ist in der
Ergänzend und/oder alternativ kann zur Veränderung des spezifischen Energieeintrags E die Vorschubgeschwindigkeit v des Werkstücks 12 angepasst werden.In addition and / or alternatively, the feed speed v of the
Schließlich wird darauf hingewiesen, dass das Ablaufdiagramm gemäß
- 1010th
- Vorrichtungcontraption
- 1212th
- Werkstückworkpiece
- 1414
- StrahldüsenanordnungJet nozzle arrangement
- 14.114.1
- StrahldüsenanordnungJet nozzle arrangement
- 14.214.2
- StrahldüsenanordnungJet nozzle arrangement
- 1616
- StrahldüsenJet nozzles
- 1818th
- Flüssigkeitliquid
- 2020
- Oberflächesurface
- 2222
- SteuereinrichtungControl device
- 23.123.1
- SignaltechnikSignal technology
- 23.223.2
- SignaltechnikSignal technology
- 23.323.3
- SignaltechnikSignal technology
- 23.4April 23
- SignaltechnikSignal technology
- 2424th
- HochdruckpumpeneinheitHigh pressure pump unit
- 2525th
- FrequenzreglerFrequency controller
- 2626
- OberflächeninspektionseinrichtungSurface inspection device
- 2828
- StrahldüsenanordnungJet nozzle arrangement
- 3636
- StrahldüsenanordnungJet nozzle arrangement
- 3838
- StrahldüsenanordnungJet nozzle arrangement
- 4040
- OberflächenabtasteinheitSurface scanning unit
- AA
- Abstanddistance
- HH
- höhenverstellbare Halterungheight-adjustable bracket
- vv
- VorschubgeschwindigkeitFeed rate
- XX
- BewegungsrichtungDirection of movement
Claims (15)
- Device (10) for descaling a workpiece (12), preferably hot-rolled material, moved relative to the device (10) in a movement direction, comprising at least one first jet nozzle arrangement (14; 28; 36; 38) with a plurality of jet nozzles (16), from which a liquid (18), particularly water, can be issued under high pressure onto a surface (20) of the workpiece (12),
a control device (22), and
a surface inspection device (26), which is in signal connection (23.2) with the control device (22) and which is arranged downstream from the jet nozzle arrangement (14; 28; 36; 38) with respect to the movement direction (X) of the workpiece (12), wherein scale on the surface (20) of the workpiece (12) is detectable by means of the surface inspection device (26) and wherein the surface inspection device is arranged directly adjacent to the jet nozzle arrangement,
characterised in that
the control device (22) has such a program configuration that the specific energy intake by which a surface (22) of the workpiece is acted on by the liquid (18) issued from the jet nozzles (16) can be regulated by means of the control device (22) in dependence on the signals of the surface inspection device (26) and
the control device (22) has such a program configuration that on the basis of the signals of the surface inspection device (26) a surface quality for the workpiece (12) is determined and compared with a predetermined target value,
wherein regulation of the specific energy intake is carried out in such a way that it is increased if the surface quality of the workpiece falls below the predetermined target value and is decreased if the surface quality of the workpiece exceeds the predetermined target value. - Device (10) according to claim 1, characterised in that a high-pressure pump unit (24), which is in signal connection (23.1) with the control device (22) and which is fluid connection with the jet nozzles (16) of the jet nozzle arrangement (14; 28; 36; 38), is provided, wherein the high-pressure pump unit (24) can be regulated by means of the control device (22) so that the pressure at which the liquid (18) is fed to the jet nozzles (16) is variable, preferably that the pressure for the liquid (18) fed to the jet nozzles (16) is correspondingly decreased or increased if the surface quality of the workpiece (12) exceeds or falls below the predetermined target value.
- Device (10) according to claim 2, characterised in that the high-pressure pump unit (24) is equipped with a frequency regulator (25), wherein the high-pressure pump unit (24) is activated in dependence on the signals of the surface inspection device (26) so as to correspondingly decrease or increase the pressure for the liquid (18) fed to the jet nozzles (16).
- Device (10) according to any one of the preceding claims, characterised in that a spacing (A) of the jet nozzle arrangement (14; 28; 36; 38) from the surface (20) of the workpiece (12) is variable, wherein this spacing (A) is settable by means of the control device (22) in controlled, preferably regulated, manner.
- Device (10) according to any one of the preceding claims, characterised in that a rate (v) of advance of the workpiece (12) is settable by means of the control device (22) in regulated manner.
- Device (10) according to any one of the preceding claims, characterised in that the surface inspection device (26) is so arranged that a three-dimensional measurement of a surface (20) of the workpiece (12) is carried out by that and a height profile of the surface (20) of the workpiece (12) is derived therefrom.
- Device (10) according to any one of the preceding claims, characterised in that a second jet nozzle arrangement (14.2) with a plurality of jet nozzles (16), which are arranged adjacent to the first jet nozzle arrangement (14.1) and upstream or downstream thereof with respect to a movement direction (X) of the workpiece and which are in signal connection with the control device (22), is provided, wherein if the surface quality of the workpiece (12) falls below the predetermined target value the second jet nozzle arrangement (14.2) can be switched on in addition to the first jet nozzle arrangement (14.1) and then liquid (18) can be issued from the jet nozzles (16) of the switched-on second jet nozzle arrangement (14.2) under high pressure onto a surface (20) of the workpiece (12).
- Device (10) according to any one of the preceding claims, characterised in that a surface scanning unit (40), which is in signal connection (23.3) with the control device (22) and which is arranged upstream of the jet nozzle arrangement (14; 28; 36; 38) with respect to the movement direction (X) of the workpiece (12), is provided, wherein the control device (22) is in signal connection with a setting drive of a height-adjustable mount (H) of the jet nozzle arrangement (14; 28; 36; 38) in such a way that if an irregularity at a surface (20) of the workpiece (12) is ascertained by means of the surface scanning unit (40) the control device (22) activates the setting drive of the height-adjustable mount (H) so that the spacing (A) of the jet nozzle arrangement (14; 28; 36; 38) with respect to the workpiece (12) can be increased.
- Method for descaling a workpiece (12), preferably a hot-rolled material, which is moved relative to a first jet nozzle arrangement (14; 28; 36; 38), which comprises a plurality of jet nozzles (16), in a movement direction (X), wherein for descaling the workpiece (12) a liquid (18), particularly water, is sprayed from the jet nozzles (16) at high pressure onto a surface (20) of the workpiece (12), wherein a control device (22) is in respective signal connection (23.1; 23.2; 23.3; 23.4) with the jet nozzle arrangement (14; 28; 36; 38) and with a surface inspection device (26), wherein a surface (20) of the workpiece (12) is checked, by means of the surface inspection device (26), downstream of the jet nozzle arrangement (14; 28; 36; 38) with respect to the movement direction (X) of the workpiece (12), wherein a surface of the workpiece directly adjacent to the jet nozzle arrangement is checked by means of the surface inspection device,
characterised in that
the specific energy intake by which a surface (20) of the workpiece is acted on by the liquid (18) issued from the jet nozzles (16) is regulated by means of the control device (22) in dependence on the signals of the surface inspection device (26), and
on the basis of the signals of the surface inspection device (26) a surface quality for the workpiece (12) is determined and compared with a predetermined target value,
wherein the specific energy intake is regulated in such a way that it is increased if the surface quality of the workpiece falls below the predetermined target value and that it is decreased if the surface quality of the workpiece exceeds the predetermined target value. - Method according to claim 9, characterised in that a high-pressure pump unit (24) is regulated by means of the control device (22) so as to vary the pressure at which the liquid (18) is fed to the jet nozzles (16).
- Method according to claim 10, characterised in that the pressure for the liquid (18) fed to the jet nozzles (16) is increased if the surface quality of the workpiece (12) falls below the predetermined target value or the pressure for the liquid fed to the jet nozzles (16) is reduced as long as the surface quality of the workpiece (12) adheres to the predetermined target value.
- Method according to any one of claims 9 to 11, characterised in that a spacing (A) which the jet nozzle arrangement (14; 28; 36; 38) has from a surface (20) of the workpiece (12) is varied by means of the control device (22) in regulated manner, wherein the spacing (A) of the jet nozzle arrangement (14; 28; 36; 38) from the surface of the workpiece (12) is decreased if the surface quality of the workpiece (12) falls below the predetermined target value or wherein the spacing (A) of the jet nozzle arrangement (14; 28; 36; 38) from the surface (20) of the workpiece (12) is increased as long as the surface quality of the workpiece (12) adheres to the predetermined target value.
- Method according to any one of claims 9 to 12, characterised in that a rate (v) of advance of the workpiece (12) in its movement direction (X) is decreased if the surface quality of the workpiece (12) falls below the predetermined target value or a rate (v) of advance of the workpiece in its movement direction (X) is increased as long as the surface quality of the workpiece (12) adheres to the predetermined target value.
- Method according to any one of claims 9 to 13, characterised in that the surface inspection device (26) is arranged downstream of the jet nozzle arrangement (14; 28; 36; 38) with respect to the movement direction (X) of the workpiece (12) and directly adjacent to the arrangement.
- Method according to any one of claims 9 to 14, characterised in that a second jet nozzle arrangement (14.2), which is arranged adjacent to the first jet nozzle arrangement (14.1) and upstream or downstream thereof with respect to a movement direction (X) of the workpiece and which is in signal connection with the control device (22), is provided, wherein if the surface quality of the workpiece (12) falls below the predetermined target value the second jet nozzle arrangement (14.2) is switched on in addition to the first jet nozzle arrangement (14.1) and then liquid (18) is sprayed from the jet nozzles (16) of the switched-on second jet nozzle arrangement (14.2) under high pressure onto a surface (20) of the workpiece (12).
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016204579 | 2016-03-18 | ||
DE102016204570 | 2016-03-18 | ||
DE102016217561.0A DE102016217561A1 (en) | 2016-03-18 | 2016-09-14 | Apparatus and method for descaling a moving workpiece |
DE102016217562.9A DE102016217562A1 (en) | 2016-03-18 | 2016-09-14 | Apparatus and method for descaling a moving workpiece |
DE102016217560.2A DE102016217560A1 (en) | 2016-03-18 | 2016-09-14 | Device and method for descaling a workpiece |
PCT/EP2017/056141 WO2017158035A1 (en) | 2016-03-18 | 2017-03-15 | Device and method for descaling a workpiece |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3429771A1 EP3429771A1 (en) | 2019-01-23 |
EP3429771B1 true EP3429771B1 (en) | 2020-07-08 |
Family
ID=59751469
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17710888.3A Active EP3429770B1 (en) | 2016-03-18 | 2017-03-14 | Device and method for descaling a workpiece in motion |
EP17711626.6A Active EP3429771B1 (en) | 2016-03-18 | 2017-03-15 | Device and method for descaling a workpiece |
EP17712093.8A Active EP3429773B1 (en) | 2016-03-18 | 2017-03-17 | Device and method for descaling a moving workpiece |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17710888.3A Active EP3429770B1 (en) | 2016-03-18 | 2017-03-14 | Device and method for descaling a workpiece in motion |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17712093.8A Active EP3429773B1 (en) | 2016-03-18 | 2017-03-17 | Device and method for descaling a moving workpiece |
Country Status (8)
Country | Link |
---|---|
US (1) | US11103907B2 (en) |
EP (3) | EP3429770B1 (en) |
JP (3) | JP6770088B2 (en) |
KR (3) | KR102183495B1 (en) |
CN (3) | CN108778543B (en) |
DE (3) | DE102016217561A1 (en) |
RU (3) | RU2697746C1 (en) |
WO (3) | WO2017157940A1 (en) |
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2017
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- 2017-03-14 KR KR1020187026798A patent/KR102183495B1/en active IP Right Grant
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- 2017-03-14 CN CN201780017801.0A patent/CN108778543B/en active Active
- 2017-03-15 WO PCT/EP2017/056141 patent/WO2017158035A1/en active Application Filing
- 2017-03-15 CN CN201780018324.XA patent/CN108883452B/en not_active Expired - Fee Related
- 2017-03-15 JP JP2018548822A patent/JP2019508257A/en active Pending
- 2017-03-15 EP EP17711626.6A patent/EP3429771B1/en active Active
- 2017-03-15 KR KR1020187027508A patent/KR102141440B1/en active IP Right Grant
- 2017-03-15 RU RU2018131172A patent/RU2701586C1/en active
- 2017-03-17 CN CN201780018043.4A patent/CN108778544B/en not_active Expired - Fee Related
- 2017-03-17 KR KR1020187027829A patent/KR102166086B1/en active IP Right Grant
- 2017-03-17 WO PCT/EP2017/056462 patent/WO2017158191A1/en active Application Filing
- 2017-03-17 RU RU2018131260A patent/RU2699426C1/en active
- 2017-03-17 EP EP17712093.8A patent/EP3429773B1/en active Active
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