DE102016222987A1 - Method of grinding the contour of the bale of a roll - Google Patents

Abstract

The invention relates to a method for grinding the contour of the bale 110 of a roller 100, in particular a roller with a steep contour in a roll stand for rolling metal strip, comprising the following steps: Specifying a desired contour for the bale 110 of the roller and grinding the contour of the Bale 110 by passing a grindstone 200 along a grindstone track D (x). In order to reduce grinding errors and grinding times, the method according to the invention further comprises the following steps: determining a grinding error e or grinding error function E (x) at least over individual lengths of the bale 110 in the axial direction x; Calculating a correction curve C (x) at least over the individual lengths of the bale 110 in the axial direction x, the correction curve C (x) avoiding the determined grinding error e; and calculating the grindstone path D (x) for guiding the grindstone 200 by superimposing the target contour A (x) + B (x) for the bale 110 on the correction curve C (x).

Description

The invention relates to a method for grinding the contour of the bale of a roll, in particular a roll with a roll contour with a steep curve in a roll stand for rolling metal strip. In addition, the invention relates to a ground according to the method roll bale contour.

Roll grinding machines with which grinding errors can be reduced or grinding times can be shortened, are in the German Offenlegungsschrift DE 37 26 055 A1 and the German utility model DE 297 21 000 U1 disclosed. In particular, it is explained in the documents that the flank or edge of a grinding wheel is frequently used for grinding in the normal grinding process. In order to minimize resulting grinding errors, constructions are proposed in the two cited documents as to how the grinding wheel can be pivoted, so that the grinding surface can be adjusted tangentially adjusted along the roll contour and guided over the bale of a roll.

However, the mechanism for pivoting the grinding wheel is very expensive, since it must be performed as free of play. Furthermore, the grinding angle is mechanically limited. Steep transitions, as occur, for example, in the region of the edges or edges of the roll bale, in particular a support roll and, in particular, bale edges with a regrind, can not be traced or adapted with the known devices. Despite swiveling grinding wheels, grinding errors still occur there.

How a grinding error can occur with curved contours is illustrated 4 , If the grindstone 200 or the grinding wheel is guided so that its center follows the desired contour S (x) for the bale 110 of the roller 100, then the flanks or edges of the grindstone undesirably remove additional material from the bale 110 of the roller. The grindstone penetrates into the desired contour. Especially at steep transitions and in the edge areas of the roll bale, the flail errors e are greatest; see the resulting dashed curve E (x) in 4 , The nominal contour S (x) is in 4 shown as a solid black line. During the grinding process, although the position or the grinding stone path can be corrected to minimize deviations or errors. However, this is associated with additional grinding and grinding time.

Examples with steep transition roll bales are in the European patents EP 2 026 915 B1 . 7 and EP 0 249 801 A1 . 1 disclosed.

The invention has for its object to improve a known method for grinding the contour of the bale of a roller to the effect that grinding errors and grinding times are minimized as possible and in this way the desired target contour for the bale of the roller is achieved more accurately and faster. Another object of the invention is to provide a roller whose contour corresponds as accurately as possible to the predetermined nominal contour.

This object is achieved with respect to the method by the method claimed in claim 1. The core idea of the present invention is to determine a suitable grindstone web for guiding the grindstone. Due to the claimed superposition of the desired final contour for the bale with a correction curve, which represents a previously determined grinding error, it is advantageously achieved that in particular the dimensions and the shape of the grinding stone are taken into account in the calculation of the grinding stone web. In this way and because the grinding stone web calculated according to the invention is already available before the beginning of a grinding process, grinding-related deviations from the desired contour of the bale of the roll can be avoided.

The inventive method further reduces the grinding time required for grinding the bale contour compared to the prior art.

The terms "bale of the roll" and "roll bale" are used synonymously.

Method steps for determining the grinding error before and after the first grinding operation, for calculating the contour of the grinding surfaces of the grinding stone used, for calculating the correction curve and for the design of the desired contour for the bale of the roller are the subject of the dependent method claims. There, it is described in particular that the calculation of the contour of the grinding surfaces of the grinding stone as well as the calculation of the correction curve can be carried out in each case for defined grinding stages or dynamically. Here are defined / iterative grinding stages z. B. scrubbing, coarse grinding and fine grinding. The term "dynamic calculation of the contour" means that the correction curve can possibly be adapted between individual grinding passes if an intermediate measurement of the ground contour does not yet show the desired result.

By prescribing or calculating an optimized initial contour for the grindstone, a more uniform wear and utilization of the grindstone can advantageously be achieved. which additionally leads to a reduction of grinding defects. Furthermore, it is advantageous if the specification or the calculation rule for the contour of the grinding surfaces of the grinding stone used is adapted when the predetermined or calculated contour of the grinding surfaces of the actual, z. B. deviates determined by measurement contour of the grinding surfaces of the grindstone. Analogously, an adaptation of the further calculation rule for calculating the correction curve can advantageously be carried out if the desired contour for the bale of the roller of the actual, z. B. deviates by measurement after a grinding process determined contour for the bale of the roller. Both adaptations advantageously also bring about a reduction of the grinding error.

The object of the invention is achieved by the device according to claim 16 device.

• 1a die Sollkontur des Ballens der Walze, die Walzenkontur ohne Korrektur, den Schleiffehler und die erfindungsgemäße Schleifsteinbahn zum Führen des Schleifsteins;
• 1b den Schleiffehler und die erfindungsgemäße Korrektur der Schleifsteinbahn als Differenz zu der Sollkurve für den Ballen der Walze in Gegenüberstellung;
• 2 die erfindungsgemäße Ermittlung der Schleifsteinbahn zum Führen des Schleifsteins;
• 3 eine errechnete oder gemessene Schleifsteinkontur; und
• 4 eine Schleifsteinbahn mit daraus resultierenden Schleiffehlern gemäß dem Stand der Technik veranschaulicht.

The description is attached to four figures, wherein

• 1a the desired contour of the bale of the roller, the roller contour without correction, the grinding error and the inventive grinding stone web for guiding the grinding stone;
• 1b the grinding error and the correction according to the invention of the grinding stone web as a difference from the nominal curve for the bale of the roller in juxtaposition;
• 2 the determination according to the invention of the grinding stone web for guiding the grinding stone;
• 3 a calculated or measured grindstone contour; and
• 4 a grindstone track with resulting grinding defects according to the prior art illustrated.

The invention will now be described in detail in the form of embodiments with reference to said figures. In all figures, the same technical elements or functions are designated by the same reference numerals.

1a shows three curves over the roll length coordinate x , First, the target contour S (x) for the bale 110 the roller 100 shown as desired after completion of at least one grinding operation. The nominal contour is shown as a solid black line. The grindstone is denoted by the reference numeral 200 designated. The dashed line shows the contour of the bale's bale after grinding when the center of the grindstone 200-M along the desired nominal contour S (x) of the bale 110 the roller would be guided. The resulting roll contour Ex) without correction deviates significantly from the desired nominal contour S (x) bale; thus describing the difference e between the two curves / contours the grinding error.

To avoid this error, the present invention provides that the whetstone 200 with its whetstone center 200-M around the correction function C (x) corrected and on a grindstone track D (x) is guided, which of the target contour S (x) for the bale ( 110 ) of the roller deviates. This grindstone railway D (x) is in 1a Drawn dotted. It can be seen that with appropriate guidance of the grindstone 200 along the grinding stone web determined according to the invention D (x) , the grindstone just touches the target contour, but does not penetrate.

1b shows (compared to 1a with scaling changed) a schematic simplification of the grinding error e when guiding the grindstone along the desired nominal contour and the inventively determined correction function C (x) from which the grinding path D ( x ) = S (x) + C (x) for guiding the grindstone. Both curves are in 1b simplified schematically insofar as they at least partially z. B. be described by predetermined straight-line equations. In practice, such simplifications may well be sufficient to at least reduce the unwanted grinding error with sufficient accuracy.

2 describes the method according to the invention for determining the grindstone web D (x) for guiding the grindstone 200 ,

Starting point for the method according to the invention is first the specification of a desired contour S (x) for the bale 110 the roller 100 , The nominal contour for the bale is in 2 not explicitly shown. Instead, it's a chamfering feature A (x) and a bale contouring function B (x) represented, the superposition of said target contour S (x) = A (x) + B (x) for the bale 110 equivalent. The chamfering function may, for. B. to a radius or polynomial function and the bale contour function by, for example, a polynomial function or an angular function. As in 2 Furthermore, the term "bale of the roller" includes the left edge area, the middle area and the right edge area of the bale 110 the roller, so not just its central area. Accordingly, all in 2 shown functions and contours for the bales preferably at least one contour section for the right edge region of the roll bale, at least one contour section for the central region of the roll bale and at least one contour section for the left edge region of the roll bale. These at least three contour sections for the bale border in the axial direction x the roller together, as in 2 is shown. At the in 2 The embodiment shown is the chamfering function A (x) in the Middle region of the roll bale constant and pronounced only in the left and right edge region, ie deviating from zero. The bale contouring function B (x) runs harmoniously. The nominal contour S (x) Therefore, due to the chamfering function shows the steep transitions in the edge region of the roll bale. For the sake of simplicity and clarification, therefore, in 2 only the grinding deviations in the edge areas compensated. This grinding error is determined according to the invention, as will be explained in more detail below.

The method according to the invention then further sees the calculation of a correction curve C (x) over at least individual lengths of the bale in the axial direction, wherein the correction curve avoids the grinding error.

Finally, the method according to the invention provides for the calculation of the grinding stone web D (x) before leading the grindstone. The calculation of the grinding stone track D (x) takes place by superimposing the desired contour for the bale, ie the functions A (x) + B (x) = S (x) with the correction curve C (x) , The grindstone railway D (x) = S (x) + C (x), also called grinding error compensation contour, can be described at least sectionally with a straight line equation, with an nth order polynomial, an angular function, an exponential function, by specifying a point sequence, as sum or superimposition several functions or by extrapolation of known functions.

The determination of the grinding error e or grinding error function Ex) and / or the correction function C (x) , In particular, before a first grinding operation according to the invention is carried out in dependence on the predetermined desired contour S (x) = A (x) + B (x) for the bale and the contour 200-f the grinding surfaces of the grindstone used 200 ,

In the areas of lesser curvature of the roll contour, d. H. In the middle region of the roll bale an acceptable grinding accuracy can be adjusted by adapting or comparing the measured roll contour and target roll contour. In the roll bale edge region, in which the roll contour measurement is problematic, the inventive roll contour is improved by the inventive specification of the sanding stone web. Both methods can alternatively also be superimposed or jointly applied to at least individual sections of the roll bale.

For the first grinding cycles, the initial roll contour can also be more accurately produced in the middle area of the roll bale by ascertaining the grinding errors (minor defects) according to the above method of the corrected grinding stone web. For the following grinding cycles, the system then switches over to the adaptation method, combining the grinding error compensation method (specification of the grinding stone path) and the adaptation method for grinding.

• - der gewünschten Sollkontur A(x)+B(x) für den Ballen;
• - der Ausgangskontur oder einer Kontur nach einem Vorkonturieren (Abrichten) 200-f des Schleifsteins 200;
• - eines Schleifstein-Abriebsmodells, welches den Verschleiß des Schleifsteins 200 in Abhängigkeit der Walzen- und Schleifsteinhärte sowie der Walzenkontur und der geschliffenen Ballenstrecke errechnet;
• - der gemessenen Schleifsteinkontur 200-f nach einer definierten Anzahl von Zwischenschritten;
• - einer adaptierten Schleifsteinkontur mit welcher zum Beispiel im Mittel die Sollkontur geschliffener Walzen in der Vergangenheit getroffen wurde.

The contour 200-f the grinding surfaces of the grindstone used 200 across the width 200-b of the grindstone can be specified or calculated using a calculation rule taking into account at least one of the following aspects:

• - The desired nominal contour A (x) + B (x) for the bale;
• - the initial contour or a contour after precontouring (dressing) 200-f of the grindstone 200 ;
• - a grindstone abrasion model, which reduces the wear of the grindstone 200 calculated as a function of the hardness of the rollers and grindstone as well as the roll contour and the ground bale section;
• - the measured grindstone contour 200-f after a defined number of intermediate steps;
• - An adapted grindstone contour with which, for example, on average the desired contour of ground rolls has been hit in the past.

3 clearly shows an example of a given or calculated contour of the grinding surfaces of a grindstone. In the edge regions and in the middle region of the roll bale, the contour can be described at least in sections by individual mathematical functions. Depending on the roller contour to be generated and other boundary conditions are z. B. different flank and edge shapes on the left and right sides of the grindstone. An initial presetting of the grinding stone contour for the different widths ranges 1-4 can additionally improve the grinding results and achieve a uniform wear of the grinding stone. This also allows the use of wider and harder or more wear-resistant grinding stones.

The calculation of the contour 200-f the grinding surfaces of the grindstone 200 can be done with the aid of the calculation rule before the beginning of the grinding process and / or during the grinding process according to defined grinding stages or dynamically.

The calculation rule for the contour 200-f The grinding surfaces of the grindstone used is preferably adapted when the resulting from the calculation rule contour of the grinding surfaces of the grindstone of the actual, for example determined by measurement contour 200-f the grinding surfaces of the grindstone 200 differs.

The determination of the grinding error e respectively. Ex) is preferably for at least individual areas of the bale 110 the roller 100 and preferably after a grinding operation, by performing the following steps: measuring the actual contour of the bale 110 the roller after the last grinding process; and calculating the possible grinding error Ex) as a deviation between the nominal contour A (x) + B (x) and the actually measured contour of the bale 110 the roller 100 ,

Based on the theoretical or measured grindstone contour 200-f and other influencing factors (see below) becomes the expected grinding error e respectively. Ex) or / and the correction function C (x) determined over the entire bale length and / or especially the contour of the grindstone track D (x) calculated, which avoids the expected grinding error over the bale length.

The determination of the grinding error e respectively. Ex) and / or the correction function C (x) taking into account the contour of the grinding surfaces of the grinding stone used, which is calculated as described in the preceding paragraphs, takes place for the area of the entire roll bale 110 including its border areas.

The calculation of the correction curve C (x) as well as the grindstone railway D (x) is carried out with the help of a further calculation rule such that at least for individual items ( xi ) in the axial direction ( x ) of the roll individual function values C (xi) of the correction curve taking into account the contour of the grinding surface 200-f of the grindstone are determined so that the grinding surface of the grindstone the target contour S (x) = A (x) + B (x) for the bale 110 the roller just touched, but not penetrating. The correction curve C (x) is then preferably determined by interpolation or extrapolation of a plurality of the determined function values C (xi).

The calculation of the correction curve C (x) over the length x of the bale 110 The roller is preferably carried out including reverse distances of the grindstone left and right of the edge of the bale 110 ,

The calculation of the correction curve C (x) can take place before the beginning of the grinding process and / or during the grinding process according to defined grinding stages or dynamically. The calculated values can be adapted by comparing the calculated and measured roll contour.

In the area of the bale edge, grinding errors in the area of the bale edge can be advantageously determined, in addition to the roll contour measurement of the grinding machine, in addition to a separate roll measuring device in the case of steep curves.

The further calculation rule for calculating the correction curve C (x) is preferably adapted when the target contour for the bale 110 the roller of the actual, for example, determined by measuring after a grinding process contour for the bale 110 the roller deviates.

The specified target contour for the bale 110 the roller is superimposed by a predetermined bale contour function B (x) , for example in the form of a polynomial function or angle function, and a chamfering function A (x) , for example in the form of a radius or polynomial function.

The nominal contour S (x) = A (x) + B (x) for the bale 110 the roller 100 in particular in the case of backup roll contours, at least one desired contour section for the right edge region of the roll bale, at least one desired contour section for the middle region of the roll bale 110 and at least one target contour portion for the left edge region of the roll bale 110 formed, wherein the at least three desired contour sections for the bale 110 in the axial direction x the roller 100 border each other.

The chamfering function A (x) for the middle area of the roll bale 110 is preferably constant, more preferably zero.

The nominal contour S (x) = A (x) + B (x) of the roll bale 110 and / or the correction curve C (x) is at a first transition point x1, preferably where the target contour portion of the right edge portion of the target contour portion for the central region of the roll barrel 110 borders, and / or at a second transition point x2, preferably where the desired contour section for the central region of the roll bale 110 adjacent to the desired contour section for the left edge region, continuous, but not continuously differentiable specified.

In many grinding machines, it is not possible with the installed measuring equipment to measure to the bale edges, because the measuring arm or probe usually reaches the minimum or maximum value (stop). In this area (especially in the area of the chamfering of the back-up roll), the grinding errors are based on the theoretical considerations or other corrections using the correction function C (x) to minimize. In this case, the roll is the sum S (x) and the correction function C (x) for the controlled grinding process as a new setpoint curve S ' ( x ) = S (x) + C (x).

The method can be applied to work and back-up rolls. The roll contours can be made from a contour with chamfering functions A (x) with B (x) = 0 or from a bale contour function B (x) with A (x) = 0 or from the sum of two or more contours A (x) + B (x) exist. In general, the method is important in rolling contours with steep curves, as they occur in roll grinding with large profile adjustment area or Stützwalzenkantenrückschliffen (chamfers).

LIST OF REFERENCE NUMBERS

100

roller

110

Bale of the roller

200

grindstone

200-b

Width of the grindstone

200-f

Grinding surface of the grindstone

200-M

Middle of the grindstone

A (x)

chamfer

B (x)

Barrel contour function

C (x)

correction function

D (x)

Grindstone train

Ex)

Flaw error function = bale contour after faulty grinding

S (x), S '(x)

Target contour of roll bale

x

axial direction of the roller

xi

single position in the axial direction

e

grinding error

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 3726055 A1 [0002]
• DE 29721000 U1 [0002]
• EP 2026915 B1 [0005]
• EP 0249801 A1 [0005]

Claims (18)

A method of grinding the contour of the bale (110) of a roll (100), in particular a roll with a steep curve in a roll stand for rolling metal strip, comprising the following steps: predetermining a desired contour for the bale (110) of the roll; and grinding the contour of the bale (110) by passing a grindstone (200) along a grindstone path (D (x)); characterized by determining a grinding error (e) or a flaw error function (E (x)) at least over individual lengths of the bale (110) in the axial direction (x); Calculating a correction curve (C (x)) at least over the individual lengths of the bale (110) in the axial direction (x), the correction curve (C (x)) avoiding the determined grinding error (e); and calculating the grindstone path (D (x)) for guiding the grindstone (200) by superimposing the target contour (A (x) + B (x)) for the bale (110) on the correction curve (C (x)). Method according to Claim 1 , characterized in that the determination of the grinding error (s) or grinding error functions (E (x)) and / or the correction function (C (x)), in particular before a first grinding operation by calculation takes place in dependence of the predetermined desired contour (A (x ) + B (x)) for the bale (110) and the contour (200-f) of the grinding surfaces of the inserted grinding stone (200). Method according to Claim 2 characterized in that the contour (200-f) of the grinding surfaces of the inserted grindstone (200) is given over the width (200-b) of the grindstone or calculated by means of a calculation rule taking into account at least one of the following aspects: - the desired one Nominal contour (A (x) + B (x)) for the bale; - The initial contour (200-f) of the grindstone (200) optionally after precontouring; a grindstone abrasion model which calculates the wear of the grindstone (200) as a function of the hardness of the grindstone and grindstone as well as the roll contour and the ground bale length; the measured grindstone contour (200-f) after a defined number of intermediate steps; - An adapted grindstone contour with which, for example, on average the desired contour of ground rolls has been hit in the past. Method according to Claim 3 , characterized in that the calculation of the contour (200-f) of the grinding surfaces of the grinding stone (200) by means of the calculation rule before the beginning of the grinding process and / or during the grinding process for defined grinding stages or dynamically / iteratively. Method according to Claim 3 or 4 , characterized in that the calculation rule for the contour (200-f) of the grinding surfaces of the grindstone used is adapted when the resulting from the calculation rule contour of the grinding surfaces of the grindstone of the actual, for example, determined by measurement contour (200-f) of the grinding surfaces of the grindstone (200) deviates. Method according to one of the preceding claims, characterized in that the determination of the grinding error (e) or grinding error function (E (x)) after a grinding operation by performing the following steps: measuring the actual contour of the bale (110) of the roller after the last grinding process; and calculating the possible grinding error (e) or grinding error function (E (x)) as a deviation between the nominal contour (A (x) + B (x)) and the actually measured contour of the bale (110) of the roller (100). Method according to one of Claims 1 to 6 , characterized in that the determination of the grinding error (e) or grinding error function (E (x)) according to one of Claims 1 to 5 for the area of the entire roll bale (110) including edge areas; and that preferably the determination of the grinding error (e) or grinding error function (E (x)) after Claim 6 for at least individual edge regions of the bale (110) of the roller (100) takes place. Method according to one of the preceding claims, characterized in that the calculation of the correction curve (C (x) takes place with the aid of a further calculation rule such that individual functional values C (xi) at least for individual positions (xi) in the axial direction (x) of the roller. of the correction curve, considering the contour of the grinding surface (200-f) of the grinding stone, so that the grinding surface of the grinding stone just touches the target contour (A (x) + B (x)) for the bale (110) of the roller, but not and preferably that the correction curve (C (x)) is determined by interpolation or extrapolation of a plurality of the determined function values C (xi). Method according to Claim 8 , characterized in that the calculation of the correction curve (C (x)) over the length (x) of the bale (110) of the roll including reversal distances of the grindstone to the left and right of the edge of the bale (110). Method according to one of Claims 8 or 9 , characterized in that the calculation of the correction curve (C (x)) before the start of the Grinding process and / or during the grinding process according to defined grinding stages or can be done dynamically. Method according to claim one of Claims 8 to 10 , characterized in that the further calculation rule for calculating the correction curve (C (x)) is adapted when the desired contour for the bale (110) of the roller of the actual, for example determined by measuring after a grinding operation contour for the bale (110) the roller deviates. Method according to one of the preceding claims, characterized in that the predetermined desired contour for the bale (110) of the roller by superposition of a predetermined bale contour function (B (x)), for example in the form of a polynomial function or angle function, and a chamfering function (A (x )), for example in the form of a radius or polynomial function. Method according to Claim 12 , characterized in that the desired contour (A (x) + B (x)) for the bale (110) of the roller (100) from at least one desired contour section for the right edge region of the roll bale, at least one desired contour section for the central region of the roll bale ( 110) and at least one target contour portion for the left edge region of the roll bale (110) is formed; wherein the at least three desired contour sections for the bale (110) adjoin one another in the axial direction (x) of the roller (100); Method according to Claim 13 , characterized in that the chamfering function (A (x)) for the central region of the roll bale (110) is constant, preferably zero. Method according to Claim 13 or 14 , characterized in that the desired contour (A (x) + B (x)) of the roll bale (110) and / or the correction curve (C (x)) at a first transition point (x1), preferably where the target contour portion of the right edge region the target contour portion for the central region of the roll barrel (110), and / or at a second transition point (x2), preferably where the target contour section for the central region of the roll bale (110) adjoins the target contour portion for the left edge region, steady but not is specified continuously differentiable. A roll (100), in particular a backing roll in a roll stand for rolling metal strip, comprising: a roll bale contour consisting of a chamfering function (A (x)) and bale contouring function (B (x)), which superimpose a desired contour of the roll bale S (x) = A (x) + B (x) gives; characterized in that in order to compensate for expected grinding errors a corrected setpoint curve of the roll bale S '(x) by adding the setpoint curve (S (x)) and a correction function (C (x)) is formed in particular in the region of the left and right roll bales. Roller (100), in particular a support roller in a roll stand for rolling metal strip, comprising: a roll bale (110) having a right edge region, a middle region of the roll bale (110) and a left edge region; wherein a target contour for the roll bale (110) is formed from at least one target contour section for the right edge region of the roll bale, at least one target contour section for the central region of the roll bale (110) and at least one target contour section for the left edge region of the roll bale (110); and wherein the at least three nominal contour sections adjoin one another in the axial direction of the bale (110) of the roller (100); characterized in that the target contour (S (x) = A (x) + B (x)) or the corrected setpoint curve (S '(x) = S (x) + C (x)) of the roll bale (110) a first transition point (x1), where the desired contour section of the right edge region adjoins the target contour section for the middle region of the roll barrel (110), and / or at a second transition point (x2), where the desired contour section for the middle region of the roll bale (110) adjacent to the desired contour section for the left edge region, continuous, but not continuously differentiable formed. Roller after Claim 16 or 17 , characterized in that the desired contour portion for the central region of the roll bale (110) is formed for example as a polynomial function or angle function.

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