The device and the roller for measuring flatness
(57) Abstract:The invention relates to rolling production and can be used by rolling thin strips. Object of the invention is the creation of a mechanism is shielded from the external environment. The device is located between the first finishing rolling stand and the reel and has at least one measuring roller with means for receiving measured values for the measurement of the bending roller. The roller is hollow, is mounted in bearings and is shaped element with holes for hydrostatic environment, installed in the inner cavity. The said openings at least partially penetrates into the cavity formed between the roller and the shaped element. The device has at least one measurement tool changing under the influence of the tension of the band parameters of the environment. The invention provides increased reliability when controlling flatness of strip. 12 C.p. f-crystals, 3 ill. The invention relates to a device for measuring the flatness of rolled strip under tension, in-line hot rolling strip containing a line of rough rolling line finishing with several prochainement in the device of this type.The deviation from flatness of rolled strips is determined by the difference in length according to the width of the rolled strip. As rolled strip affects the tension, the difference in length is aligned, at least partially due to elastic elongation. You cannot direct measurement of the difference in the lengths. To determine the flatness defect can use the distribution of tension when stretching, depending on the difference of lengths.To establish deviations from flatness in cold rolled strips are used, for example, guide rollers. When the deviation of the strip deflecting force is proportional to the stretching, is used as a measuring value.From DE 3721746 A1 a method and a device for measuring the flatness of rolled strip under tension in the lines of hot-rolled wide strip. Using broken into segments of rollers for measuring tension measure the distribution of tension in the rolled strip and thus indirectly determine its flatness. In the case of such broken into segments of rollers there is great danger of clogging of the gap between these rollers, used or for use in corrosive environments, and this PR is does create a device and a measuring roller, based on a different measuring principle and not having the disadvantages of the known devices.This problem is solved in a device of the aforementioned type due to the fact that in the rolling direction between the first rolling stand of the finishing line rolling and the winder is at least one measuring roller, rolled strip is fed through each of the measuring roller, which is bent under the action of the tension band, and provides the receiver measured value for measuring bending of the measuring roller.The device according to the invention preferably can be used, in particular, when rolling very thin strips.Is preferred to have one or more measuring rollers between the rolling stands of the line finish rolling and/or during the last rolling stand in the rolling direction of the line finishing and/or before the driving mechanism of the winder and/or between the drive mechanism and winder.Depending on the location of one or more measuring rollers of the measured value obtained by measuring rollers, can be used for displacement in the axial direction of the rolls of the rolling stand, for izmenennoe the location of the measuring rollers can affect the cooling of the rolled strip and/or work rolls.If the measuring roller is, for example, between the drive mechanism and the winder, the measured value obtained from the measuring roller can be used to rotate the drive mechanism. Using this event you can regulate the passage of the strip when wound on a mandrel winder.If the drive mechanism of the winder is, as usual, after cooling of the strip, with the aid of the measuring roller located in front of the driving mechanism of the winder, it is possible to measure the impact on the cooling of the strip and, if necessary, to regulate the cooling of the strip.If proveshivanii measuring roller is hollow and is mounted for rotation in fixed bearings in the cavity of the measuring roller in the axial direction concentric with the axis of the unloaded measuring roller is a holder for at least one receiver of the measured values, then each receiver measured value is reliably protected from external influences.The holder for the receiver measured values shall be of such dimensions that the space between the holder and the surface of the inner lining of the measuring roller is sufficient to prob measuring roller relative to the direct holder using track gauges. More precise conclusions about the flatness of the strip can be made if the fixed bearings of the measuring roller are held in the bearing brackets, which are devices for measuring force. They can measure the strength preferably in several directions.If the distances in the axial direction of the holder at regular intervals around its perimeter there are several receivers measured values, in particular the travel of the probes in each position of the measuring roller can be removed several measured values and calculate the average value. The calculation of the average value increases the accuracy and reliability of measurements. As a rule, enough to place in several places respectively on two opposite receiver measured value.If the holder of the receiver measured value has a through hole in the axial direction with connections to the receivers measured value, its supply piping can be protected lies inside the holder.Instead of electrical receiver measured value of the measurement path can be made, for example, with a laser. In this case, as the conductor signals apply the conclusions about the bending roller and thereby on the flatness of the strip, if proveshivanii measuring roller is hollow and is mounted for rotation in fixed bearings in the cavity of the measuring roller passes shaped element with holes for hydrostatic environment, with openings at least partially fixed in the cavity formed between the measuring roller and the shaped element and with holes connected to at least one device for measuring the flow (for example, direct measurement using a propeller or ultrasound, reducing the pressure using the throttle). Depending on the tension of the rolled strip is changed, the volume of flow in the holes shaped element. In this implementation of the invention, the volumetric flow can be measured preferably on the outside of the measuring roller by using a device for measuring the flow regardless of the temperature of the rolled strip. As a side effect of hydrostatic medium removes heat from the measuring roller. In addition, hydrostatic environment supports are made mostly of thin-walled proveshivanii measuring hollow roller operating in the area adjoining rolled strip.As a suitable hydrostatic environments are used, for example, oil,the pH of the logged expanding in the form of a pocket.It is preferred that the width of the measuring roller is a lot cormanobresso or funnel-shaped widening of entrance holes.Hereinafter the invention is explained in more detail with several examples.In Fig. 1 is shown a measuring roller which is located inside the measurement system path;
Fig. 2 - measuring roller with hydrostatic support, and
Fig. 3 is a longitudinal section of the measuring roller according to Fig. 2 with, respectively, a schematic depiction of the measurement flow by way of the pressure difference, shown in the right half of the drawing, and the direct measurement of the flow shown in the left half of the drawing.Proveshivanii measuring roller, indicated by the number 1, is mounted by means of two self-aligning roller bearings 2, supported on brackets 3 bearings. The brackets 3 bearings are located on the cross beam 5. Between the brackets 3 bearings and crosshead 5 is one device 4 for measuring force.Concentric with and in the direction of the axis 7 of the measuring roller shown in Fig. 1 unloaded in the cavity of the measuring roller 1 passes deracialized at predetermined distances, respectively, the other system devices 9 measurement path. Of the various signal systems 9 measurement path not shown in the drawing, the computing device can determine the line of the bending roller 1 under load rolled strip 11. Using the appropriate locations of the two opposite systems devices 9 measurement path, it becomes possible to obtain two measured values in one position of the roller 1 and then calculate the average value.This increases the accuracy and reliability of measurements. Through the hole 12 in the axial direction of the holder 8 to the system 9 for measuring the paths are not shown in the drawing, the electrical connecting wires.Based on the curve and signal device 4 for measuring power with reliability to obtain information about the distribution of tension in the rolled strip 11 and thereby its flatness.On the basis of this form of execution is obtained a secure location systems 9 devices for measuring the path inside the roller 1.On the side view of the measuring roller 1 can be noted that the yoke 5, which still holds at a certain distance bracket 3 bearing itself is located on the hydraulic cylinder 13, through which the roller 1 is pressed from below to chatanooga to approach trajectory strip or preferably at the beginning or at the end of the strip is disposed in a protected position.In Fig. 2 shows the measuring roller with a hydrostatic system for receiving measured values.Proveshivanii roller 32 is hollow and is mounted for rotation in not shown in Fig. 2 fixed bearings. In the cavity of the measuring roller 32 is coaxially thereto is a cylindrical shaped element 33.Axially through the shaped element 33 passes several holes 34, 35, which in its end zones are deflected at a right angle and into the cavity 36 formed between the measuring roller 32 and the shaped element 33. In the place of entrance holes 34, 35 extend in the form of pockets 37A or funnels b (see Fig. 3; here schematically presents this funnel). Aside from located in the form of a cascade of holes 34, 35 for the flow of hydrostatic environment is another hole 38, which serves to divert the incoming hydrostatic environment. The hole 38, which serves also as the drain, is expanding cormanobresso in the area of its entrance into the cavity 36.Passing over the roller 32 rolled strip 39 Flex relatively thin-walled roller 32. Due to the bending decreases the flow of hydraulic medium through the openings 34, 35. Changing course enie flow can be measured directly or determined from the pressure drop in place of throttling; both possibilities are shown in Fig. 3. As can be seen in the left half of the drawing, the working device 40 for measuring the flow has a propeller 41 is an alternative it is also possible, for example, measurement using ultrasound - holes 34, 35, and a certain amount of the flowing medium is converted in the Converter 42 measured value into an electrical signal for regulation. Another device 43 for measuring the flow shown in the right half of the drawing.Here in the holes 34, 35 provided by the inductors 44, which determine the change of the flow based on the pressure difference, which served to regulate in the form of an electrical signal from the transducers 42 measured value.Hydrostatic environment serves simultaneously for cooling the measuring roller 32, and also rolled strip 38. 1. Device for measuring the flatness of rolled strip under tension in a hot-rolling line, a line of rough rolling and the finish line rolling with several rolling stands and winder, and the device includes at least one measuring roller mounted in the rolling direction between the first rolling stand of the line h is means receiving the measured values for the measurement of the bending of the specified at least one measuring roller, and proveshivanii measuring roller is hollow and is mounted for rotation in fixed bearings; shaped element with holes for hydrostatic environment, held in the cavity of the measuring roller, and the openings at least partially penetrates into the cavity formed between the measuring roller and the shaped element; at least one measurement tool changing under the influence of the tension of the band parameters of the environment connected with channels.2. The device under item 1, characterized in that at least one measuring roller is located between the rolling stands of the line finishing and/or in the direction of rolling for the last rolling stand of the finishing line rolling, and/or before the driving mechanism of the winder, and/or between the drive mechanism and winder.3. The device under item 1 or 2, characterized in that the measured values obtained from the measuring roller, used to offset roll rolling stands in the axial direction, to change the bending of the rolls, and also to rotate the mounting system rolling stands.4. Device according to any one of paragraphs.1-3, characterized in that between the drive mechanism and the winder is dissolved, and the face, used to rotate the drive mechanism.5. Device according to any one of paragraphs.1-4, characterized in that proveshivanii measuring roller is made hollow and is rotatably fixed in the bearings and concentric with the axis of the unloaded measuring roller holder is held in the axial direction within the measuring roller, at least one tool receiving measured values.6. The device under item 5, characterized in that the means of reception measured value represents the measuring path.7. The device under item 5 or 6, characterized in that the fixed bearings are held in the bearing brackets, which are devices for measuring force.8. The device under item 5 or 7, characterized in that a rigid holder connected to the bearing brackets, holds the bearing brackets at a certain distance.9. Device according to any one of paragraphs.5-8, characterized in that the distances in the axial direction of the holder evenly around its perimeter are means receiving the measured values.10. Device according to any one of paragraphs.5-9, characterized in that it contains at what Eesa fact, the holder has a through hole in the axial direction with connections to the means receiving the measured values.12. The device according to p. 11, characterized in that the holes in the zone of its inputs made expanding in the form of a pocket or crater.13. The device under item 12 or 13, characterized in that at least one hole is made as a hole for passing a flow.
FIELD: automation of rolled stock production.
SUBSTANCE: at controlling thickness of tube wall in multi-stand continuous stretch-reducing mill, thickness of tube wall is measured behind mill by means of wall thickness measuring devices. Measured values are processed in computing unit. Revolution numbers of drive engines of rolls are controlled by means of units for controlling revolution number. In order to minimize formation of inner multi-arc profile at passing tube, total elongation value is kept constant due to changing revolution number of drive engines of rolls under control of computing unit.
EFFECT: enhanced quality of products.
5 cl, 4 dwg
SUBSTANCE: invention can be used in automation of hot and cold rolling mills. Method provides determination of parameters of elastic deformation of stand: modulus of rigidity of stand, correction factor for transfer from absolute roll-to-roll clearance of stand to relative position in respect to roll pass design point, efforts on stand elastic deformation line corresponding to beginning of linear section and use of obtained parameters for refined determination of parameters of adjustment (rearrangement) of stand. Method of determination of parameters of stand elastic deformation line is combined with process of stand designing and it is implemented at step or continuous loading of stand rolls by roll compression force created by hydraulic pressure devices from minimum stand off-loading force to designing force. Proposed method improves accuracy of adjustment (rearrangement) of rolling stand by roll-to-roll clearance, decreases breaking of strips and increases yield of good strips by decreasing rejection of metal caused grow-back defect, reduces consumption of metal and work and support rolls owing to exclusion of additionally changing and re-grinding of rolls in case of strip break in stand.
EFFECT: increased yield of strips.
3 cl, 4 tbl, 2 ex, 4 dwg
FIELD: plastic working of metals, namely processes for reversing hot rolling of sheet metal at tension, possibly in multi-stand mills with coilers in furnaces.
SUBSTANCE: method is designed for such cases when it is impossible to use loop holders for keeping desired tension because of design of mill or large bending rigidity of strip. Method is realized due to changing revolution number of driven stands according to fluctuation of inter-stand tension values. Novelty is steps of calculating power of rolling in each stand, extracting from received value power of rolling without tension and then obtaining rolling power caused by tension; using said value for determining tension efforts due to deciding equation system.
EFFECT: enhanced stability of rolling process due to increased accuracy for determining inter-stand tension.
3 cl, 1 dwg
FIELD: plastic working of metals, namely by rolling, possibly for making thin steel sheets.
SUBSTANCE: process for cold rolling of strip comprises steps of successive reduction of strip in stands of continuous rolling mill with tension between stands. According to invention in five-stand rolling mill tension of strip before third stand is set in such a way that it exceeds strip tension after said stand by 1.01 - 1.56 times. Tension of strip before fourth stand exceeds by 1.01 - 1.85 times tension after said stand. Tension after second stand exceeds by 1.01 - 1.04 times tension before said stand.
EFFECT: lowered vibration degree of rolling and backup rolls at rolling process.
SUBSTANCE: invention relates to rolling technologies. The proposed metal strip (1) fabrication method envisages passage of the metal strip (1) over multiple rollers (2, 3, 4, 5) with the strip tension (S) in the feed direction (F) being sufficient for the strip to remain basically smooth at least between the two rollers (2, 3). Inner tensions of the strip under stress become optically visible. One defines inner tensile strength or differential inner tensile strength with the values taken into consideration during metal strip (1) fabrication. To provide for inner tensile strength definition the metal strip (1) becomes exposed to radiation of a source of light (6) and surveyed by means of two cameras (7, 8) from two different sides.
EFFECT: improved quality of metal strip fabricated.
FIELD: process engineering.
SUBSTANCE: invention relates to metal forming, particularly, to rolling at section mills. When metal piece rear end comes out from the stand, current moment magnitude at the next stand is measured to be compared with moment variation setting preset for each stand. Comparison results are used to correct appropriate preset coefficients of tension regulation between stands when metal piece rear end comes out from the stand.
EFFECT: higher efficiency and reliability, faultless operation.
FIELD: process engineering.
SUBSTANCE: invention relates to rolling-mill machinery and serves to automatically control loop tension and height in interstand spaces of hot rolling broad-strip stands. In compliance with this invention, when loop enters the (i+1)-ii-stand, loop holder is automatically lifted from initial position to contact with strip. Thereafter, motor rpm of (i+1)-th stand is regulated to lift loop holder to operating angle. Additionally, interstand space previous i-th stand hydraulic pressure device is corrected.
EFFECT: higher accuracy of strip tension adjustment in dynamic conditions, higher yield of rolled stock.
SUBSTANCE: invention refers to rolling plant, and namely to tandem rolling plant for cold-rolled strip, with several roll stands located in one rolling mill; besides, in production direction (P) of metal strip the first roll stand is made as the drive roll stand and serves as an inlet for continuous roll stand section in which considerable reduction of metal strip thickness is performed, and due to the appropriate control of drive roll stand there can be achieved the increase in mechanical stress at metal strip inlet. There also described is control method of rolling plant, and namely tandem rolling plant for production of metal strip, in which the first roll stand is controlled in production direction (P) of metal strip as drive roll stand, in which by means of drive roll stand there performed is considerable increased in mechanical stress at metal strip inlet without considerable reduction of metal strip thickness.
EFFECT: providing the distribution of single reductions in compliance with design features of an individual roll stand in rolling mill.
17 cl, 2 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy. Rolling mill for rolling strip 4 has several main stands 1, 1' and reeler 2 arranged there behind. Said main stands incorporates working rolls 5, 5' and, at least, bearing rolls 6, 6'. Rolling mill control device 3 receives data on strip 4 to define, at least, one reduction A other than zero of strip 4 of all passes at rolling mill. Control device 3 uses entered data to define reduction of single pass for main stands 1, L. Said control device controls over stands 1, 1' and reeler 2 to make strip 4 be rolled in main stands in compliance with definite single-pass reductions and, then reeled, by reeler 2. Single-pass reduction of the main stand 1' arranged immediately ahead of reeler 2 equals zero while outlet side tension in strip 4 is smaller than that and inlet side. Strip 4 passes through said stand L with no deformation on, at least, one side.
EFFECT: higher quality of strip.
10 cl, 5 dwg