WO2010037904A1 - Method for measuring a cylindrical element in a fiber web machine and an arrangement and a measuring device for the method - Google Patents

Method for measuring a cylindrical element in a fiber web machine and an arrangement and a measuring device for the method Download PDF

Info

Publication number
WO2010037904A1
WO2010037904A1 PCT/FI2009/050779 FI2009050779W WO2010037904A1 WO 2010037904 A1 WO2010037904 A1 WO 2010037904A1 FI 2009050779 W FI2009050779 W FI 2009050779W WO 2010037904 A1 WO2010037904 A1 WO 2010037904A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring
measuring device
measurement
diameter
points
Prior art date
Application number
PCT/FI2009/050779
Other languages
French (fr)
Other versions
WO2010037904A9 (en
Inventor
Peter Backlund
Erkki Tarvainen
Original Assignee
Metso Paper, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metso Paper, Inc. filed Critical Metso Paper, Inc.
Priority to DE112009002415T priority Critical patent/DE112009002415T5/en
Publication of WO2010037904A1 publication Critical patent/WO2010037904A1/en
Publication of WO2010037904A9 publication Critical patent/WO2010037904A9/en

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/08Measuring arrangements characterised by the use of mechanical techniques for measuring diameters
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/12Measuring arrangements characterised by the use of electric or magnetic techniques for measuring diameters
    • G01B7/125Measuring arrangements characterised by the use of electric or magnetic techniques for measuring diameters of objects while moving
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21GCALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00Other accessories for paper-making machines
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical techniques
    • G01B11/08Measuring arrangements characterised by the use of optical techniques for measuring diameters
    • G01B11/10Measuring arrangements characterised by the use of optical techniques for measuring diameters of objects while moving
    • G01B11/105Measuring arrangements characterised by the use of optical techniques for measuring diameters of objects while moving using photoelectric detection means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/28Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures
    • G01B7/287Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures using a plurality of fixed, simultaneously operating transducers

Definitions

  • Figure 8 depicts the determination of a roll diameter utilizing a narrow sector, in a coordinate system view.
  • step 101 the measuring device 12 is placed on the surface 11 of the element 10 in such a way that it covers from the surface
  • the sensors 13.1 - 13.9 are substantially parallel in the base 25, the profile of which conforms to the curved surface 11. This simplifies the measurement and the related evaluation, for example, to the extent that one of the coordinates of each measuring point is standardized. It is obvious that the sensors 13.1 - 13.9 can also be in the base 25 at a slight tilt, for example, conforming substantially to the curvature of the element 10. In addition, the base 25 can also be straight.
  • the frame 25.1 of the base 25, the material of which is, for example, solid steel, has openings for the sensors 13.1 - 13.9 at a set distance from each other to which openings the sensors are adapted, for example, in a fixed or an adjustable manner. According to an embodiment, the sensors 13.1 - 13.9 can be in the frame 25.1 at uniform intervals.
  • the contact between a sensor 13.1 - 13.9 and the surface 11 can be detected, for example, by means of. control 5 electronics 19, 20 of the sensor 13.1 - 13.9 based on the resistance appearing in the linear movement.
  • An advantage of a contacting sensor 13.1 - 13.9 is that it can be used, for example, in rolls with a glossy surface, wherein reflecting light would complicate a measurement performed with a laser,
  • the measuring device 12 can be precisely positioned on the surface 11 of the element 10 both in the. axial and peripheral
  • step 405 the diameter of the element 10 in position A n is determined using information 16 created in the measuring points 15.1 - 15.9 and in step 406 the diameter of position A n is
  • the measuring device 12' includes means 17, 26 - 28 for scanning the sectoral area 14 on the surface 11 of the cylindrical element 10.
  • the means include a carriage 27 equipped with a sensor 13 ' adapted to measure the surface of the element 10, and two guides 17, 26 for moving the carriage 27 and thus also the sensor 13 ' near the surface 11 of the element 10 at least in two dimensions.
  • the carriage 27 is adapted to be moveable in the peripheral direction of the element 10 on the first, advantageously straight guides 26.
  • the first guides 26 are connected by their ends to second elongated linear guides 17 that are perpendicular to the first guides 26, between which the carriage 27 is adapted to be moveable in the axial direction of the element 10.
  • the sensor 13' is in the carriage 27 which can move on both guides 17, 26 as a 2D scanner.
  • the device 12' can always measure the absolute diameter since the measurement is performed in the peripheral direction of the element 10 against a direct guide 26.
  • the devices 12, 12' can thus measure the diameter D of the cross section of the roll 10 in the position in which the measuring device 12, 12' is located.
  • the least squares method is used in the evaluation. '
  • the center point and the radius are left unknown in the circle equation.
  • the size of the shape to be fitted becomes such that the sum of the squares of the ' distances of all points is as small as possible.
  • This evaluation can be performed, for example, using the GENFIT function of the Mathcad software. As initial data, the function requires the coordinates of the measuring points and initial guesses for the radius and the center point.
  • Geometric fitting is particularly well suitable for defining the geometric shape of a cylindrical element 10 of a fiber web forming machine, such as the diameter, as the number of measuring points is finite and they are located in a relatively narrow sectoral area due to lack of space, which is known to be present in production machines .

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The invention relates to a method for measuring a cylindrical element (10) in a fiber web machine, wherein - a measuring device (12, 12') is arranged on the surface (11) of an element by which a sectoral area (14) is covered from the surface of the element, - a measurement is performed while the element is in a non- rotating movement status wherein information (16) concerning the surface (11) of the element is created from the measuring points (15.1 - 15.9, 15') of the sectoral area (14), - the diameter (D) of the element is determined using said information. The diameter of the element is determined by performing geometric fitting for the measuring points wherein. a desired geometric shape is fitted among the measuring points in such a way that the distance between the measuring points and the fitted shape is minimized. The invention also relates to a measuring arrangement and a measuring device for the method.

Description

METHOD FOR MEASURING A CYLINDRICAL ELEMENT IN A FIBER WEB MACHINE AND AN ARRANGEMENT AND A MEASURING DEVICE FOR THE METHOD
The invention relates to a method for measuring a cylindrical element in a fiber web machine, wherein
- a measuring device is arranged on the surface of an element by which a sector from the surface of the element is covered, - •
- a measurement is performed while the element is in a non-rotating movement status, the measurement creating information related to the surface of the element from the measuring points of the sectoral area,
- the diameter of the element is determined using said information.
The invention also relates to a measuring arrangement and a measuring device for the method.
Diameter profile deviations of paper machine rolls cause, inter alia, non-uniform and premature wear of fabrics, premature wear of other rolls, fabric elongation and fabric runnability problems. With a correct roll reconditioning sequence, a longer roll and fabric life is achieved as well as improved machine runnability.
A roll diameter has conventionally been measured with a circummeter wherein determining a diameter profile that covers the entire roll is practically impossible. Various coordinate measuring devices are also used, but the use of such devices in paper machines with confined space is difficult, and the measuring devices are expensive. Furthermore, many measuring methods require auxiliary equipment, such as separate guides or cables used as reference measuring lines . Known measuring apparatuses also require rotating the roll (for example, reference wheels) , or the measuring method is not suitable to be performed by one person only for some other reason.
For measuring a diameter profile, a device resembling a large slide gauge also exists . This device is very suitable for performing measurements in a workshop. When a roll is in its position in a paper machine, the space around the roll is often very limited for performing a measurement. Due to this, a device resembling a large slide gauge is not suitable for measuring rolls that are connected directly to the machine.
The above mentioned measuring methods include several unresolved drawbacks both as regards the practical performance of the measurement and the measuring accuracy. Knowing the diameter is important, for example, for determining the roll condition or as regards handling operations carried out for the roll; for instance, when a handling operation must be directed to a correct axial position in the roll.
An obj ect of the invention is to provide a method for measuring a cylindrical element , in a fiber web machine , the method giving more freedom than before for its implementation and of fering a possibility for determining precisely and quickly, for example, the diameter of the element . Another obj ect of the invention is t o provide a corresponding measuring arrangement and a measuring device which, compared to prior art , is more freely arrangeable in the vicinity of the element and which can be used to measure , for example , the diameter of the element utilizing only a relatively small area from the surface of the element . The characteristic features of the method according to the invent ion become evident f rom the appended c laim 1 . Correspondingly, the characteristic features of the measuring arrangement according to the invention become evident from the appended claim 14 and those of the measuring device from the appended claim 15 . In the method the diameter of an element is determined by- performing geometric fitting for the measuring points wherein" a desired geometric shape is fitted among the measuring points in such a way that the distance of the measuring points from the fitted shape is minimized.
According to an embodiment, the diameter of an element or a corresponding parameter to be measured can be defined surprisingly accurately even for an element located in its operating position in a fiber web machine, with only a relatively small sectoral area of its surface exposed in which the measurement can be performed with the device. Then the rest of the surface of the cylindrical element can be in contact with, for example, a fabric, or for instance, surrounded by a runnability device in such a way that taking a measurement on the surface of the element is not easy or even possible. Thus the invention suits extremely well for use in confined fiber- web machine, conditions without the need of removing the element from the machine for taking a measurement .
The invention is based on the surprising observation that a measurement can be reliably performed in a relatively narrow sectoral area by means of points selected from the surface of an element that are located close to each other . A measurement can be performed for a finite number of measuring points and thus by us ing only three measuring point s ; however , the accuracy increases when the number of measuring points is increased. Then, for example, the bestfit method can be used, wherein it is possible to minimize the effect of the measuring accuracy of an indivi dual point on the f inal di ame t er calculation .
Several measuring methods can be applied in the invention for performing the measurement in a relatively narrow sectoral area of the cylindrical surface of an element . A first example is a set of sensors which are arranged successively on the surface of an element, for example, in the peripheral direction of the element, and for which the mutual location is known. Thus the diameter of the element can be determined based on the measurement information created by the sensors. Another example consists of reading the surface of an element by scanning. Here a sensor is used that measures at least one surface of the element with or without contact. The location of the sensor in the base of the measuring device can be changed in such a way that each measuring point on the surface of the element at which the measurement is taken with the sensor, for example, in the peripheral direction of the element, is continuously known.
The diameter of an element can be measured in selected discrete axial measuring positions. According to an embodiment, the surface of an element can also be measured as a moving measurement successively in several axial positions or even as a continuous measurement. Then the length of the entire element can be analyzed at a desired accuracy.
"The diameter of an element can be measured for condition monitoring purposes or, for example, in connection with a handling operation to be carried out for the element, such as before or after the handling operation. The advantages achieved with the invention are very versatile. The measurement method is simple, quick, inexpensive, and the measuring results are obtained directly in an electronically processable and visualizable form. Other characteristic features of the invention become evident from the appended claims, and other advantages obtainable with the invention are discussed in a wider extent in the description.
The invention is described below in detail by making reference to the enclosed drawings that illustrate one of the embodiments of the invention, in which Figure 1 is a flow chart showing the basic principle of the- method in partial steps, Figure 2 is a perspective view showing a first embodiment of a device for measuring a roll diameter with several sensors at one go,
Figure 3 shows a device according to Figure 2 as seen from the side, Figure 4 is "a flow chart showing an application example of the method in more detail, Figure 5 is a principle drawing showing another embodiment of the device for measuring a roll diameter with- one sensor, as seen from the side, Figure 6 is a flow chart showing a measurement performed with a .device according to Figure 5,- Figure 7 shows measuring points in an axial view, and
Figure 8 depicts the determination of a roll diameter utilizing a narrow sector, in a coordinate system view.
Cylindrical elements in a paper machine or another fiber web machine that are adapted to rotate via their center axis in the operating condition are usually rolls or cylinders, which can be present as many as several tens in one machine. Diameters of the elements can vary to a great extent ranging between, for example, 600 mm and 1300 mm, depending on the machine concept and position. In the context of the invention, a fiber web. machine refers to paper, pulp, board and tissue machines, for example. Although the description occasionally refers to a roll, instead of that the invention can also be applied equally well to any other rotating element of a fiber web machine.
Rolls and cylinders can support various fabrics in the machine, such as felts or wires. Rolls and cylinders can be located in the machine direction relative to each other, for example, successively and/or superposed, which, for its part, can cause lack of space around a roll or a cylinder. For ensuring fabric travel as undisturbed as possible and for the machine runnability, the roll diameter should be as set.
Figure 1 depicts a flow chart illustrating the basic principle 5 of a method for measuring a cylindrical element in a fiber web machine that is rotatable in the operating condition via its center axis, and Figure 2 is a perspective view of an exemplifying embodiment- of a device 12 set on a cylindrical shell surface 11, more generally near the surface 11, of an
10 element 10. Although the application examples describe the invention for measuring a diameter, the invention also enables determining the periphery and the circumferential coordinates of the element 10. Thus the diameter parameter, object of the measurement, is also connected to the other parameters related
15 to the element 10 and, more generally, to the shape of the element 10. As partial step 101 of the method; a measuring device 12 is arranged on the surface 11 of the element 10 for measuring the diameter D of the element 10. The measuring device 12 is arranged to be in contact with the element 10 by
20 placing it, for example, on the upper surface of the shell 11. Then the device 12 rests against the surface 11 of the element 10. Contact points can be multiple as regards the measurement itself and/or supporting of the device 12. By arranging the device 12 in contact with the surface 11 of the element 10, a
25 solid measuring arrangement is obtained, which minimizes measuring errors for its part.
In step 101 the measuring device 12 is placed on the surface 11 of the element 10 in such a way that it covers from the surface
30 11 of the element 10 a sectoral area 14 having a set size and being relatively narrow with respect to the entire peripheral length of the element 10. In this case, a covered sectoral area 14 refers to such an area on the surface 11 of the element 10 to which measurement operations are directed, and thus the-
35 sectoral area 14 has measuring points ranging from 15.1 to 15.9. The definition of the sector as such is known to one skilled in the art. According to a definition, it can refer to a part 14 of a surface 11 that remains between two lines or planes extending radially through the axis of revolution 24 of the element 10. A corresponding sectoral area 14 is an area on the shell surface 11 of the element 10 that remains between the end points of the lines in the peripheral direction or planes in the axial direction. Thus, besides the peripheral dimension, the area 14 can have a dimension in the direction of the center axis 24 of the element 10. Figure 2 provides a principle view of the axis of revolution 24 of the element 10.
As partial step 102, a measurement is performed during which the element 10 is stationary or in a non-rotating movement status. In the measurement, information 16 concerning the surface 11 of the element 10 is created from the measuring points 15.1 - 15.9 of the sectoral area 14 (Figure 7) . As partial step 103, the diameter D of the element 10 is determined based on the measurement performed in step 102 using the information 16 related to the measuring points 15.1 - 15.9.
The diameter D of the element 10 is determined, according to an embodiment, by performing geometric fitting for the measuring points 15.1 - 15.9 in partial step 103. In geometric fitting, a desired geometric shape is fitted among the information 16 created about the measuring points 15.1 - 15.9 in such a way that the distance between the measuring points 15.1 - 15.9 and the shape is minimized. In geometric fitting, the bestf it method can be used, for example. The principle of geometric fitting is explained" in this application further below.
Figures 2 and 3 show an example of the measuring device 12 for measuring a cylindrical element 10 in a fiber web machine, which is adaptable on the surface 11 of an element 10 that is in a non-rotating movement status (Figure 2). The measuring device 12 includes as its main components a base 25 and sensor means 13.1 - 13.9 adapted, for example, successively in the base in the peripheral direction of the element 10 for measuring the surface 11 of the element 10, the sensors being multiple in this case. The base 25 and the sensors 13.1 - 13.9 adapted thereto are arranged relative to each other in such a way that when placed against the surface 11 of the cylindrical element 10, the measuring device 12 can cover a sectoral area 14 including measuring points 15.1 - 15.9 from the surface 11 of the element 10. In partial step 102 of the method, the sensors 13.1 - 13.9 adapted to the base 25 can measure at one go several measuring points 15.1 - 15.9 located at a set distance from each other on the surface of the element 10 and thereby create information 16 concerning the surface of the element 10 from a finite number of measuring points 15.1 - 15.9 of the sectoral area 14. According to an embodiment, the measuring points 15.1 - 15.9 can be measured substantially simultaneously, for example, within the limits of measurement electronics. According to an embodiment, the measuring points 15.1 - 15.9 can be at a constant distance from each other, whereby an advantage is achieved in the evaluation with the coordinates being relatively standardized in one dimension. The measuring points 15.1 - 15.9 can be in one line, for example, in the peripheral direction of the element 10, wherein the axial position of the measuring points 15.1 - 15.9 is substantially constant; on the other hand, they can also be allowed a slight inclination relative to the peripheral direction, wherein the axial positions of the measuring points 15.1 - 15.9 can thus deviate. Thus the sectoral area 14 can be conceived to have an axial dimension as well, within the limits of the measuring accuracy.
The measuring points 15.1 - 15.9 are measured on the surface 11 that is substantially perpendicular to the axis 24 of the element 10. The number of sensors 13.1 - 13.9 and thus the number of the measuring points 15.1 - 15.9 can be, for example, 4 - 15, more specifically 5 - 11, such as 9. With only five measuring points, fairly precise results are achieved considering that the diameters of the cylindrical elements of fiber web machines are relatively massive and the width of the sectoral area 14 is relatively small compared thereto. Measurement error is dependent on the width of the sectoral area 14 relative to the diameter of the element 10, and on the accuracy of points .
As is clearly shown in Figure 3, the sensors 13.1 - 13.9 are substantially parallel in the base 25, the profile of which conforms to the curved surface 11. This simplifies the measurement and the related evaluation, for example, to the extent that one of the coordinates of each measuring point is standardized. It is obvious that the sensors 13.1 - 13.9 can also be in the base 25 at a slight tilt, for example, conforming substantially to the curvature of the element 10. In addition, the base 25 can also be straight. The frame 25.1 of the base 25, the material of which is, for example, solid steel, has openings for the sensors 13.1 - 13.9 at a set distance from each other to which openings the sensors are adapted, for example, in a fixed or an adjustable manner. According to an embodiment, the sensors 13.1 - 13.9 can be in the frame 25.1 at uniform intervals.
The sensors 13.1 - 13.9 can be linear sensors, for example. An example of a sensor can be an LVDT sensor (Linear Variable Differential Transformer) wherein the stroke length of the sensor can be varied and the operating principle of which is well known as such to those skilled in the art. In addition, the spherical measuring head 13* of the LVDT sensors 13.1 - 13.9 provides the advantage that the tip of the sensor and the surface 11 of the element 10 need not meet at a right angle but the contact point can be slightly offset from the tip of the sensor. This happens in case of, for example, the outermost sensors 13.1, 13.2, 13.8, 13.9. In measuring step 102, the linear sensors 13.1 - 13.9 located in the frame 25.1 are run in contact with the surface of the element 10. The contact between a sensor 13.1 - 13.9 and the surface 11 can be detected, for example, by means of. control 5 electronics 19, 20 of the sensor 13.1 - 13.9 based on the resistance appearing in the linear movement. An advantage of a contacting sensor 13.1 - 13.9 is that it can be used, for example, in rolls with a glossy surface, wherein reflecting light would complicate a measurement performed with a laser,
10 for example. If the object of the measurement is a roll with a soft surface, the measurement may be challenged by the fact that the tip of the sensor 13.1 - 13.9 is pressed against the surface 11. With hard rolls this problem does not exist. With soft rolls the contact of the sensor 13.1 - 13.9 with the
15 surface 11 of the element 10 can be detected, for example, based on the speed change in the travel movement of the sensor 13.1 - 13.9. A speed reduction indicates that the sensor 13.1 - 13.9 is in contact with the surface 11 of the roll 10. Since each sensor 13.1 - 13.9 can be run in contact with the surface
20 11 of the element 10, it is also possible to eliminate problems caused to the accuracy of the measurement result by temperature variation and thermal expansion.
Using the base 25, the device 12 can be set as desired on the
25 surface 11 of the element 10 in a standardized way and it can also be kept there firmly during the entire measurement. In this case the base .25 includes a frame 25.1 equipped with sensors 13.1 - 13.9. Elongated support elements 25.2, 25.3 set axially to the element 10 are located at both ends of the frame
30 25.1. The elements include pipes 25.2 set perpendicularly to the peripheral frame 25.1 of the element 10 having at both ends shoes 25.3 that are coaxial with the pipes 25.2. With the shoes
25.3 the measuring device 12 can be precisely positioned on the surface 11 of the element 10 both in the. axial and peripheral
35 directions . It is obvious that the elements can be implemented in many different ways. Figure 4 shows in more detail an exemplifying embodiment for carrying out the method with the device 12 shown in Figures 2 and 3. In this case, the object of measurement is the relative diameter of a cylindrical element 10. When it is sufficient for the measurable object 10 to acquire information merely about the magnitude of variation occurring in the diameter profile, i.e. how large a deviation is present in the diameter D in the various axial positions of the roll 10, the diameter D can be measured by placing the device 12 at one end of the roll 10 and by calibrating the sensors 13.1 - 13.9 using the design diameter. As partial step 401 of the method, the measuring device 12 is placed on the surface 11 of the element 10 in a selected position A0 in the axial direction of the element 10. For example, the position can be at the end of the element 10. Alternatively, calibration can be performed against a known geometric shape, in which case the measurement is absolute. As partial step 402, the sensors 13.1 - 13.9 of the measuring device 12 are calibrated in this position A0 to the design diameter of the element 10. Then it is assumed that the diameter D of the roll 10 is known in the calibration position. As substep 402.1 in the calibration, the sensors 13.1 - 13.9 can be calibrated by defining them values that represent the distance from the virtual line 22 (Figure 3) . The virtual line 22 can extend, for example, through the center point of the tip 13* of the center-most sensor 13.5, perpendicularly to the measuring direction. Thus, in calibration it is necessary to use a known geometric shape against which the locations of the sensors can be determined.
In step 403, the measuring device 12 is moved to a selected axial measuring position An and in step 404 the measurement is performed in this position. During the measurement, the tips of the sensors 13.1 - 13.9 are run in contact with the surface 11 of the element 10 and the corresponding position is determined relative to the virtual line 22. More generally, this can be referred to as the sensor distance relative to the reference position. Since the sensors are substantially parallel with each other in the measuring direction, when positioned in this way it is possible to use, in the evaluation in step 405, a virtual linear line against which the position of the sensors 5 can be easily determined.
In step 405 the diameter of the element 10 in position An is determined using information 16 created in the measuring points 15.1 - 15.9 and in step 406 the diameter of position An is
10 compared to the diameter determined in the calibration position A0. Thus it is possible to determine the relative change in the diameter. A corresponding comparison can also be made between two separate rolls. When measuring in this way, it may be that the absolute diameter is not discovered (depending on how well
15 A0 is known), but variations in the -diameter are found out. It is understandable that, on the one hand, a calibration procedure according to this embodiment using the virtual line 22, and on the other hand, the relative determination of the diameter of the element 10, can also be applied independently
20 of each other although they. have been described here in the same embodiment .
When it is desired to use the device 12 for measuring the absolute diameter, the sensors 13.1 - 13.9 can be calibrated 25 against a precisely known diameter. Then it can be made sure at the calibration moment that values given for the sensors 13.1 - 13.9 in the calibration are absolutely correct.
Figure 5 depicts another example of the device 12 ' and Figure
30 6 depicts the corresponding flow chart for a method carried out with the device 12'. According to this embodiment, instead of a .measurement performed with several sensors at one go, the surface 11 of the element 10 can also be measured using only one sensor 13'. In this case in step 602, the measuring device
35 12' scans the surface 11 of the cylindrical element 10 for creating information from the substantially peripheral measuring points 15 ' of the sectoral area 14. By scanning points on the surface 11 of the roll 10 to be measured, additional accuracy is achieved for the calculation of the diameter D. Using a 3D scanner 12 ' , it is possible to take notably more points than, for example, with the fixed sensors 13.1 - 13.9 present in the previously described device 12.
For scanning, the measuring device 12' includes means 17, 26 - 28 for scanning the sectoral area 14 on the surface 11 of the cylindrical element 10. According to an embodiment, the means include a carriage 27 equipped with a sensor 13 ' adapted to measure the surface of the element 10, and two guides 17, 26 for moving the carriage 27 and thus also the sensor 13 ' near the surface 11 of the element 10 at least in two dimensions. The carriage 27 is adapted to be moveable in the peripheral direction of the element 10 on the first, advantageously straight guides 26. The first guides 26 are connected by their ends to second elongated linear guides 17 that are perpendicular to the first guides 26, between which the carriage 27 is adapted to be moveable in the axial direction of the element 10. Thus the sensor 13' is in the carriage 27 which can move on both guides 17, 26 as a 2D scanner. The device 12' can always measure the absolute diameter since the measurement is performed in the peripheral direction of the element 10 against a direct guide 26.
The sensor 13' measures the distance of the carriage 27 to the surface 11 of the roll 10. The sensor 13 ' can be a laser distance sensor, for example. On the other hand, instead of being a non-contacting sensor, the sensor can be a contacting sensor. In addition, one sensor 28 is fastened directly to the carriage 27 or the guide 26 to measure the position of a moving measuring head 13 ' , 27 in the peripheral direction of the element 10. In this case the position of the carriage 27 placed on a linear guide 26 is thus measured. Hence the scanner is a 3D scanner which can read the coordinates 16 of the measuring points 15 ' over a narrow sector 14 on the surface 11 of the roll 10 in directions X and Y and wherein the distance of the sensor 28 from the surface 11 of the element 10 represents direction Z. The first guides 26 and the carriage 27 are adapted to form the frame of the base 25'. Elongated second guides 17 in the axial direction of the element 10 serve as support elements for positioning the measuring device 12 ' on the surface 11 of the element 10 in the peripheral direction. It is obvious that instead of the guides 17 the support elements of the device 12 ' can also be a static entity composed of elements 25.2, 25.3 as shown in Figure 2.
Step 602 can be composed of multiple substeps which can be performed in an alternative order. As step 602.1, a position sensor 28 can be used to determine the position of the sensor 13' measuring the surface 11. of the element 10, in the peripheral direction of the element 10. Then, like during the actual measurement of the surface 11 of the element 10, the sensor 13' is stationary. As step 602.2, the distance to the surface of the element 10 can be measured with the sensor 13 ' and the measurement result can be stored. After the measurement has been taken at one measuring point 15' in the peripheral direction of the element 10, then in step 602.3 it can be analyzed whether there are any remaining measuring points in this axial position. If yes, then it is proceeded to step 602.4 in which the sensor 13 ' is moved with the carriage 27 in the peripheral direction of the element 10 to the following
'measuring point along the guide 26. In other words, the measuring points are substantially parallel with each other in the measuring direction in this embodiment, too, and in addition, the measuring points are also measured from the surface 11 that is perpendicular to the axis 24 of the element 10. After a set amount of measurements has been taken in one axial position, it is proceeded to step 603 to determine the diameter D of the element 10 using the information related to the measuring points. In this embodiment, too, the number of successive measuring points 15' can be, for example, 4 - 15, more specifically 5 - 11, such as 9. It is obvious that this scanner embodiment allows remarkably increasing the number of measuring points. It is possible to have several tens, even 5 hundreds or thousands of measuring points, since the sectoral area 14 can be analyzed steplessly or actually by "scanning" . Step 601 may be known as such from the previous embodiments. Steps 101, 401, 601 can be preceded by cleaning of the surface 11 of the element 10.
10
In both of the above embodiments, the' substantially peripheral sectoral area 14 of the element 10 covered by the measuring device 12, 12' can be, for example, 1 - 60°, more specifically 10 - 50°. The width of the sectoral area 14 can be, for • 15 example, 200 - 1000 mm, more specifically 300 - 700 mm, such as 500 mm, depending on the element. For- the forming section rolls, the measurement can be performed over a sector of 20 degrees, for example. If more precise results are desired, a sector of 50 degrees, for example, can be used. In any case the
20 covered and measured sectoral area is smaller than 180° and generally also smaller than 90°. Then the measurement can be performed over a relatively small sectoral area 14. A narrow sector is advantageous particularly in the sense that free space available for a measuring arrangement in a fiber web
25 machine environment is usually very limited around the element 10.
Referring to Figure 7, examples of measurement possibilities' in the axial direction of the roll 10 are described. Both of the
30 above described devices 12, 12' can be used to measure points in a narrow area 14 on the surface 11 of the roll 10 in an individual axial position An. The measuring devices 12, 12' are so designed that the measuring points 15.1 - 15.9, 15' are measured from the surface 11 perpendicular to the axis 24 of
35 the roll 10. The devices 12, 12' can thus measure the diameter D of the cross section of the roll 10 in the position in which the measuring device 12, 12' is located.
For measuring the entire diameter profile of the roll 10, the device 12 ' according to the embodiment of Figure 5 can be slid along the surface 11 of the roll from end to end. Here the carriage 27 including its peripheral guides 26 is moved on an axial guide 17 with selected intervals from one measuring position to another or the measurement can also be performed as a moving/continuous measurement. In this way it is possible to determine the state of groove formation of the element 10 inthe peripheral' direction.
Another alternative is to measure the diameter at regular intervals using a device 12 according to the embodiment of Figures 2 and 3, although a measurement sliding axially along- the surface 11 of the element 10 is also possible with the device 12. In a discrete measurement, the device 12 is lifted off the surface 11 of the roll 10 in one axial position An and placed in a new axial measuring position An+1 on the surface 11 of the roll 10. The distance between the axial positions A1 - An can be, for example, 200 - 700 mm, more specifically 300 - 600 mm, such as 500 mm. Between these measurements, it is possible to measure only the side profile of the roll 10 using a linear guide and a distance measurement. The measurement of the side profile can be performed using a device 12 ' according to the embodiment of Figure 5. By combining these two measurements, it is possible to determine the diameter profile of the roll 10 over the entire length.
The measurement 12 , 12 ' can also be performed in the peripheral direction on the various s ides of the el ement 10 , in case allowed by the available space . Another poss ibil i ty is to rotate the roll 10 between the measurements in such a way that the measurement can be performed in the same axial position at several points of the periphery. In this way, the invention can also address the circularity of an element.
Besides a method and a device 12, 12' , the invention equally relates to an arrangement for measuring a cylindrical element 10 in a fiber web machine, to which reference is made in the case of Figure 3. The arrangement includes any type of the devices 12, 12 ' described above and additionally data processing equipment 21 which is adapted to communicate with sensor means 13.1 - 13.9, 13' , 28 adapted to define information 16 created with the sensors 13.1 - 13.9, 13 ' , 28 using the diameter D of the element 10. The .sensors 13.1 - 13.9, 13 ' , 28 can be connected to an amplifier 19 , which is further connected, via a micro-controller 20, to a portable PC 21 including a display which stores, for example, measurement data 16 collected during partial steps 102, 404, 602.1, 602.2, calculates the diameter D of the element 10 and also enables viewing the profile of the element 10 as a 3D model, for example. The device 12, 12 ' provides an easily documentable output.
The carriage 27 set on the guides 17, 26 can be moved, for example, with a step motor, which is controlled by a microcontroller 20 (Figure 3) . The electronic system also includes means for controlling the sensors 13.1 - 13.9, 13', such as for running their tips 13* in contact with the surface 11 of the element 10. As an alternative to or along with the servo/step motor control, all' movements can be performed manually or with spring force, for example. The implementation of the control of sensors 13.1 - 13.9, 13' is apparent for those skilled in the art. In addition, the PC 21 can also directly control a grinding machine or similar in case the element 10 is subjected to a handling operation simultaneously with the measurement.
The methodology of the measurement and the related calculation is described below in more detail referring to Figure 8. The geometric shape of the cylindrical element 10 of a fiber web machine conforms, or at least is assumed to conform, to a substantially circular arch. The arch can be defined when at least three points can be measured in it. In case of rolls, it is possible in this way to achieve an accuracy of a few tens of millimeters for the diameter. Based on this, the diameter of the element i0 can be determined by measuring points, located on the surface 11 of the element 10, on the surface 11 that is perpendicular to the axis of revolution 24 of the element 10. Theoretically three points would be sufficient for determining the local diameter of the element 10. In this case, when" determining the diameter D of the element, the points should be,, however, as distant as possible from each other in order to ensure that the effect of possible measuring inaccuracy on the calculation of the diameter would be as small as .possible. However, in a paper machine environment it is not possible to select points from all over the roll. By bringing the points closer to each other, the effect of the measuring accuracy of an individual point on the calculation of the final diameter increases at the same time.
Figure 8 depicts an example of a measurement in a coordinate system wherein coordinates, indicated with tick marks, have been measured in the periphery 11 of a roll 10 over a narrow sector. Using the coordinates, it is possible to create mathematical expressions for the circle of interest that evaluate the diameter of the circle and the computational center point. With the aid of the points measured, a sector of the circle is known based on which a graphic of the whole circle is created and the geometric shape of the roll 10 can be outlined and a diameter D can be determined for it. Basically, the measurement can be performed with either of the above mentioned devices 12, 12'. The information 16 which the sensors 13.1 - 13.9, 13' create for the calculation can be adapted to the coordinate system in a method known as such. If more measurements are taken from the measuring points than is required for defining the geometric shape, geometric fitting is performed at the points measured. An example mentioned here for this is the bestfit method. In geometric fitting, a desired geometric shape is fitted among the set composed of the measured points in such a way that the distance between the measured points and the fitted shape is as small as possible.
Since the distance of all points cannot be exactly the same, the least squares method is used in the evaluation.' Here the center point and the radius are left unknown in the circle equation. Then the size of the shape to be fitted becomes such that the sum of the squares of the' distances of all points is as small as possible. This evaluation can be performed, for example, using the GENFIT function of the Mathcad software. As initial data, the function requires the coordinates of the measuring points and initial guesses for the radius and the center point. Geometric fitting is particularly well suitable for defining the geometric shape of a cylindrical element 10 of a fiber web forming machine, such as the diameter, as the number of measuring points is finite and they are located in a relatively narrow sectoral area due to lack of space, which is known to be present in production machines .
The method according to the invention can be applied, for example, in connection with the manufacture of an element 10 as well as in connection with the machine maintenance. A roll or a cylinder can be measured while installed in the machine. In solutions according to prior art, the element must be removed from the machine in an in-between stage for carrying out the handling operation and then reinstalled to the machine for performing the measurement. Since the measuring device 12, 12' is .easily arrangeable close to the element 10, according to an embodiment, the geometric shape of the element 10 can be measured even during a handling operation carried out for the element 10. It is apparent that the above description and the figures related thereto are intended only for illustrating the present invention. The invention is thus not limited merely to the above described embodiments or those set forth in the claims, but many different variations and modifications of the invention, which are possible within the inventional idea specified in the appended claims, will be apparent for one skilled in the art.

Claims

1. A method for measuring a cylindrical element (10) in a fiber web machine wherein - a measuring device (12, 12') is arranged on the surface (11) of the element (10) by which a sectoral area (14) is covered from the surface (11) of the element (10) ,
- a measurement is performed while the element (10) is in a non-rotating movement status, the measurement creating information (16) concerning the surface (11) of the element (10) from measuring points (15.1 - 15.9, 15') of the sectoral area (14),
- the diameter of the element is determined using said information (16), characteri zed in that the diameter (D) of the element (10) is determined by performing geometric fitting for the measuring points (15.1 - 15.9, 15') wherein a desired geometric shape is fitted among the measuring points (15.1 - 15.9, 15') in such a way that the distance between the measuring points (15.1 - 15.9, 15') and the fitted shape is minimized.
2. A method according to claim 1, characterized in that the bestfit method is used in geometric fitting.
3. A method according to claim 1 or 2 , characterized in that the measuring device (12) is used to measure at one go several measuring points (15.1 - 15.9) located at a set distance from each other.
4. A method according to claim 1 or 2 , characterized in that the measuring device (12') is used to scan the surface (11) of the cylindrical element (10) for creating information from measuring points (15' ).
5. A method according to any of claims 1 - 4, characterized in that the number of measuring points (15.1 - 15.9, 15') is finite, such as 4 - 15, more specifically 5 - 11.
5 6. A method according to any of claims 1 - 5, characterized in that the sectoral area (14) covered by the measuring device (12, 12') is 1 - 60°, more specifically 10 - 50°.
7. A method according to any of claims 1 - 6, characterized in 10 that the measuring points (15.1 - 15.9, 15') are substantially parallel with. each other in the measurement direction.
8. A method according to any of claims 1 - 3 or 5 - 7, characterized in that a virtual line (22) -'is used in the
15 evaluation against which the position of sensors (13.1 - 13.9) included in the measuring device (12) is determined.
9. A method according to claim 8, characterized in that the sensors (13.1 - 13.9) are calibrated by setting them values
20 representing the distance from the virtual line (22) that extends via the center point of the tip (13*) of the center- most sensor (13.5) perpendicularly to the measurement direction.
25 10. A method according to any of claims 1 - 9, characterized in that the method measures the relative diameter of a cylindrical element (10) , wherein
- a measuring device (12, 12') is set in a selected position (A0) in the axial direction of the element
30 * (10),
- the measuring device (12, 12') is calibrated in this position to the design diameter of the element (10), the measuring device (12, 12') is moved to a 35 selected measuring position (A1 - An) and a measurement is performed, - the diameter (D) of the element (10) is determined in a position (A1 - An) and it is compared to the . diameter in the calibration position (A0) .
5 11. A method according to any of claims 1 - 10, characterized in that the measurement is performed against a straight guide (26) . '
12. A method according to any of claims 1 - 11, ' characterized 10 in that the measuring points (15.1 - 15.9, 15') are measured on the surface (11) that is perpendicular to the axis (24) of the element (10) . '
13. A method according to any of claims 1 - 12 , characterized 15 in that the measurement is performed in the axial direction of the element (10) at regular intervals and the side profile of the element (10) is measured between the measuring positions (A1 - An) .
20 14. An arrangement for measuring a cylindrical element in a fiber web machine, the arrangement including a measuring device
(12, 12') which is adaptable on the surface (11) of an element
(10) that is in a non-rotating movement status, and wherein the measurement is adapted to be performed with a method according
25 to any of claims 1 - 13, characteri zed in that the measuring device (12, 12') includes
- a base (25, 25') arranged to set against- the surface (11) of the cylindrical element (10) and to cover a sectoral area (14) from the surface (11) of 0 the element (10),
- sensor means (13.1 - 13.9, 13') adapted to the base
(25, 25') for creating information (16) concerning the surface (11) of the element (10) from the measuring points (15.1 - 15.9, 15') of the sectoral 5 area (14) and the arrangement further includes data processing equipment (21) that is adapted to communicate with the sensor means (13.1 - 13.9, 13' ) adapted to define said information (16) using the diameter (D) of the element (10) .
15. A measuring device for measuring a cylindrical element, the measuring device being adaptable on the surface (11) of an element (10) that is in a non-rotating movement status, and with which measuring device (12, 12 ' ) the measurement is adapted to -be performed with a method according to any of claims 1 - 13,. characterized in that the measuring device (12,. 12 ' ) includes
- a base (25, 25') adapted to set against the- surface (11) of the cylindrical element (10) and to cover a sectoral area (14) from the surface (11) of the element (10) ,
- sensor means (13.1 - 13.9, 13 ') adapted to the base (25, 25' ) for creating information (16) concerning the surface (11) of the element (10) from the measuring points (15.1 - 15.9, 15' ) .
16. A measuring device according to claim 15, characterized in that multiple sensors (13.1 - 13.9) are adapted to the base (25) in the peripheral direction of the element (10) at a set distance from each other for measuring several measuring points (15.1 - 15.9) at one go.
17. A measuring device according to claim 16, charac teri zed in that the sensor means (13.1 - 13.9) adapted to measure a curved surface (11) are substantially parallel in the base (25) .
18. A measuring device according to claim 17, characterized in that the measuring device (12' ) includes means (17, 26 - 28) for scanning a sectoral area (14) on a surface (11) of a cylindrical element (10) .
19. A measuring device according to any of claims 15 - 17, characterized in that the base (25, 25' ) includes a frame (25.1, 26) to which the sensor means (13.1 - 13.9, 13 ' ) are adapted, the frame (25.1, 26) having elongated support elements (25.2, 25.3, 17) in the axial direction of the element (10) for positioning the measuring device (12, 12' ) on the surface (11) of the element (10) in the peripheral direction.
20. A measuring device according to claim 18 or 19 , characterized in that the means for scanning the sectoral area
(14) on the surface (11) of the cylindrical element- (10) include • ■ ' a carriage (27) equipped with a sensor- (13 ' ) adapted to measure the surface of the element (10) , - first advantageously straight guides (26) on which the carriage (27) is adapted to be moved in the peripheral direction of the element (10) , - second guides (17) on which the carriage (27) is adapted to be moved in the axial direction of the element (10) .
PCT/FI2009/050779 2008-10-03 2009-09-30 Method for measuring a cylindrical element in a fiber web machine and an arrangement and a measuring device for the method WO2010037904A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112009002415T DE112009002415T5 (en) 2008-10-03 2009-09-30 Method for measuring a cylindrical element in a fiber web machine and an arrangement and a measuring device for the method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20085940 2008-10-03
FI20085940A FI121687B (en) 2008-10-03 2008-10-03 Method and arrangement for measuring a cylindrical body in a fiber web machine and a corresponding measuring device

Publications (2)

Publication Number Publication Date
WO2010037904A1 true WO2010037904A1 (en) 2010-04-08
WO2010037904A9 WO2010037904A9 (en) 2010-05-20

Family

ID=39924585

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2009/050779 WO2010037904A1 (en) 2008-10-03 2009-09-30 Method for measuring a cylindrical element in a fiber web machine and an arrangement and a measuring device for the method

Country Status (3)

Country Link
DE (1) DE112009002415T5 (en)
FI (1) FI121687B (en)
WO (1) WO2010037904A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8745887B2 (en) 2011-03-16 2014-06-10 Rolls-Royce Plc Method of measuring a component
WO2015023391A1 (en) * 2013-08-12 2015-02-19 Victaulic Company Method and device for forming grooves in pipe elements
CN110514097A (en) * 2019-09-12 2019-11-29 马嘉锋 A kind of efficient anchor chain diameter detection device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011055650A1 (en) * 2011-11-23 2013-05-23 Ralf Huselstein Device for measuring the diameter or radius of a workpiece
DE102012012020A1 (en) 2012-06-16 2012-11-08 Heidelberger Druckmaschinen Ag Method for feeding sheet to machine, involves placing sheet in frictional contact with transport roller, where sheet is displaced to provide desired path by transport roller and is driven by motor around its axis
RU2605642C1 (en) * 2015-03-23 2016-12-27 Федеральное государственное бюджетное образовательное учреждение высшего образования "Юго-Западный государственный университет" (ЮЗГУ) Method of measuring and processing initial irregularities of shape of thin-wall cylindrical shells

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4389788A (en) * 1981-08-07 1983-06-28 The Goodyear Tire & Rubber Company Apparatus and method for measuring roll diameters
US4729174A (en) * 1986-07-15 1988-03-08 Pgl Corporation Method of determining circularity and mean radius of closed curved surface
FI944638A (en) * 1994-10-05 1996-04-06 Miikka Kotamaeki Method for measuring diameter differences in a large rotatable cylindrical piece
DE19647604A1 (en) * 1996-11-18 1998-05-20 Axel Dipl Ing Helmerth Unit for measuring the shape of rolls
JPH10206144A (en) * 1997-01-21 1998-08-07 Nkk Corp Method and apparatus for measurement of diameter of roll
JP2004045206A (en) * 2002-07-11 2004-02-12 Kobe Steel Ltd Measuring instrument for measuring dimension of cylindrical object

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4389788A (en) * 1981-08-07 1983-06-28 The Goodyear Tire & Rubber Company Apparatus and method for measuring roll diameters
US4729174A (en) * 1986-07-15 1988-03-08 Pgl Corporation Method of determining circularity and mean radius of closed curved surface
FI944638A (en) * 1994-10-05 1996-04-06 Miikka Kotamaeki Method for measuring diameter differences in a large rotatable cylindrical piece
DE19647604A1 (en) * 1996-11-18 1998-05-20 Axel Dipl Ing Helmerth Unit for measuring the shape of rolls
JPH10206144A (en) * 1997-01-21 1998-08-07 Nkk Corp Method and apparatus for measurement of diameter of roll
JP2004045206A (en) * 2002-07-11 2004-02-12 Kobe Steel Ltd Measuring instrument for measuring dimension of cylindrical object

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8745887B2 (en) 2011-03-16 2014-06-10 Rolls-Royce Plc Method of measuring a component
WO2015023391A1 (en) * 2013-08-12 2015-02-19 Victaulic Company Method and device for forming grooves in pipe elements
US9333548B2 (en) 2013-08-12 2016-05-10 Victaulic Company Method and device for forming grooves in pipe elements
US10449589B2 (en) 2013-08-12 2019-10-22 Victaulic Company Method and device for forming grooves in pipe elements
CN110514097A (en) * 2019-09-12 2019-11-29 马嘉锋 A kind of efficient anchor chain diameter detection device
CN110514097B (en) * 2019-09-12 2020-12-15 南通贝斯特钢丝有限公司 Anchor chain diameter detection equipment

Also Published As

Publication number Publication date
FI20085940A (en) 2010-04-04
WO2010037904A9 (en) 2010-05-20
DE112009002415T5 (en) 2011-09-29
FI121687B (en) 2011-02-28
FI20085940A0 (en) 2008-10-03

Similar Documents

Publication Publication Date Title
WO2010037904A1 (en) Method for measuring a cylindrical element in a fiber web machine and an arrangement and a measuring device for the method
EP3093611B1 (en) Measuring method and device to measure the straightness error of bars and pipes
JP5277033B2 (en) Correction ball diameter calculation method and shape measuring apparatus
JP5887224B2 (en) Method and apparatus for measuring tire ground contact characteristics
JP2004333312A (en) Method of calibrating surface condition measuring apparatus, program of calibrating surface condition measuring apparatus, recording medium with recorded calibration program and surface condition measuring apparatus
JP5845373B2 (en) Profile measurement / calibration equipment
JP2010523948A (en) Method for measuring roundness of round wire
JP2008524561A (en) Component measuring device and evaluation unit using triangulation sensor
EP1681532A2 (en) Method and system for inspection of fabricated components
KR20150058078A (en) Measuring unit for measuring the bending radius and the forwarding of a workpiece in a bending machine
WO2017209026A1 (en) Shape measuring device and shape measuring method
KR101198492B1 (en) method and system for measurement of roll diameter
JP5038290B2 (en) Crankshaft roller burnishing method
JP4948336B2 (en) Rolling roll diameter measuring device of grinding machine and diameter measuring method of rolling roll
JP2023126360A (en) Surface quality measuring device and correlation generating method
JP6524441B2 (en) Attitude correction method of inter-surface distance measuring device
JP4098649B2 (en) Calibration tool for surface texture measuring machine, calibration method for surface texture measuring machine, calibration program for surface texture measuring machine, and recording medium recording this calibration program
JP2009180700A (en) Cylindrical shape measuring device and cylindrical surface shape measuring method
JP6481469B2 (en) Surface distance measuring apparatus and method
KR101288968B1 (en) Apparatus for measuring diameter of object and method for measuring the same
KR200168896Y1 (en) Device for measuring a radius of curvature
JP2012083248A (en) Apparatus and method for measuring circular mechanical component
JP4840878B2 (en) Wire type 3D coordinate measuring machine
RU2134404C1 (en) Superposed roundness gage
JP6980558B2 (en) Evaluation device and evaluation method

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09817333

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 1120090024157

Country of ref document: DE

122 Ep: pct application non-entry in european phase

Ref document number: 09817333

Country of ref document: EP

Kind code of ref document: A1