JPH04148819A - Method and apparatus for measuring roll profile - Google Patents

Abstract

PURPOSE:To measure the profile of a roll accurately on line by providing three reference points in the same plane as the cross-sectional plane of the roll, and measuring the distances between the reference points and the surface of the roll. CONSTITUTION:When a scanning motor 7-3 is driven, a ball screw 7-1 which is directly coupled with the motor is rotated. A reciprocating stage 4 is reciprocated in the axial direction of a roll. Three sensors 6 are attached to the surface of a sensor head 5 facing the roll to be measured 1 at equal intervals toward the center of the cross section of the roll apart from the surface of the roll by required distances. The measured value from each sensor 6 is inputted into an operating device 9. The fluctuation of the roll diameter is computed. The number of rotations of the motor 7-3 is detected with a pulse generator 8 and inputted into the operating device 9. The position of the sensor 6 in the axial direction of the roll is computed. Thus, the profile of the roll is measured.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method and apparatus for accurately measuring the profile of a rolling roll or a plating roll for metal materials using a distance measuring device.

Conventional Techniques As a method for measuring the profile of rolling rolls and plating rolls, there is a method described in Conventional Methods.

(A) A method in which a distance detector is used to measure the distance between a reference plane provided parallel to the roll axis and the roll surface, and the distance detector is scanned parallel to the roll axis.

(B) A method of measuring the roll profile by measuring the circumference or diameter of the cross section of the roll perpendicular to the roll axis and further determining its distribution in a direction parallel to the roll axis.

(B-1) In the method of (B), the roll diameter is detected by using two distance meters, which are arranged oppositely on the diameter axis of the cross section of the roll and whose positional relationship is fixed to each other. A method of measuring the roll diameter by detecting the positional relationship between two points on a line: the cross-sectional circumference of the roll.

(B-2> As a method for measuring the roll circumference in method (B), the amount of movement of the roll circumference is detected from the rotational speed of a detection roll provided in parallel contact with the roll axis, and is separated from this detected amount. A method of calculating the roll circumference from the output value of the installed roll rotation speed detector.

(C) A method of measuring the outer radius of a roll by measuring the distance from three reference points on a straight line in the same plane as the cross section of one roll to the roll (see Japanese Patent Laid-Open No. 11.67606).

Problems to be Solved by the Invention A profile measuring device that employs the method (A) above is:
Providing a reference plane parallel to the roll axis is extremely difficult and impractical due to roll play, eccentricity, inclination, etc.

Furthermore, the method (B) is superior to the distance detector method in that it does not require a reference plane and can directly measure the roll diameter. However, in method (B-1) above, the accuracy of fixing the positional relationship of the two rangefinders greatly affects the detection accuracy, and furthermore, the installation position of the two rangefinders is within the vertical plane of the roll axis. If the roll cross-section diameter axis is not accurately positioned, errors will occur.
It has the disadvantage that it is not suitable for use in limited spaces such as rolling mills or in adverse environments.

In addition, the method (B-2) has problems with durability because it uses a contact roll, and high precision measurement is difficult due to slipping and the like.

In method (C), in order to improve measurement accuracy, if the distance between the reference points set on a straight line in the same plane as the cross section of the D-roll is increased, the measurement is performed diagonally to the roll surface. As a result, distance measurement accuracy cannot be obtained. Moreover, if the relative positional relationship of the three distance measuring devices changes, a very large measurement error will result.

This invention solves the problems in the method (C) above, and provides a method for accurately measuring roll profiles of rolling rolls and plating rolls online, and a method for measuring roll profiles with high precision in a limited space. The purpose of this project is to propose a device with excellent durability.

Means for Solving the Problems This invention is a method for determining the profile of a roll by providing three reference points in the same plane as the cross section of the roll and measuring the distance between them and the surface of the roll. In this method, the distance between the devices and the roll surface is measured using three distance measuring devices placed close to the roll surface toward the center of the circular roll cross section in the same plane as the cross section of one roll. This method calculates the amount of change in the outer diameter of the roll from the amount of change in the value.

In addition, as a device for carrying out this method, it is arranged close to the roll surface in the same plane as the cross section of the roll, toward the center of the cross section of the circular roll, and is movable parallel to the roll axis. three distance measuring devices for measuring the distance between the two, and a calculation means for calculating the amount of change in the outer diameter of the roll from the amount of change in the distance measurement value between the device and the roll surface measured by the distance measuring devices. The gist is the equipment provided.

Function: In this invention, the three distance measuring devices (sensors) are arranged in the same plane as the cross section of the roll, facing the center of the roll, because ■ the displacement of the roll can be measured perpendicular to the measurement surface , the distance to the roll surface can be measured with high accuracy, and ① measurement errors due to sensor play and roll eccentricity can be completely eliminated.

The measurement principle of this invention will be explained based on FIG.

Figure 1 shows the backlash of the sensor head and the eccentricity of the roll.
(△C1φ) This is a diagram showing the variation in the amount of displacement when the center of the roll is treated as if it has moved virtually, and the variation in the roll diameter (△R) and the variation in the amount of displacement are accompanied by the variation in the sensor head (△C1φ). be.

The variation in roll diameter (ΔR) is expressed by the following formula.

△L1-△R1△C-C03 (≠+θ1)・ (1)△
■Par△R1△C-CO39+ ・ (2)△
L3-△Rju△C-C05 (φ-θ2) (3) Here,
Assuming θl−θ2, from equations (1) to (3), we get (
4) and (5) are obtained.

△■-1: △R+△C (cosφcosθ−5inφs
inθ) -14) △L3-△R + △C (cos t)
cos θ+sjnt) sjnθ) −(5) When the above equations (4) and (5) are combined into one set, the following equation (6) is obtained.

△L, →-△73-2△R+2△Ccos φco
s θ (6) Transforming equation (6), we get the following (7)
As shown in the equation, equation (8) is obtained from equation (7).

△L1+△l, 3-2△L 2 ・CO3θ=2△R(
1-cosθ)...(7) The manufacturing accuracy of the sensor head is 1θ1-θ21 × 0.02
6. When θ-27° and sensor head play is 1 mm or less, the measurement error is set as θ1-θ, θ2-θ+△θ and substituted into equation (8), and the error term is as follows. , IL required for rolling rolls and metsuki rolls! I
J constant accuracy can be easily achieved. The required accuracy for rolling rolls is ±10μmm, and the required accuracy for metsuki rolls is 1
It is about 00 μm.

In this invention, while scanning the sensor in the roll axis direction, the distance measurement value is manually inputted into the calculation device to calculate the variation △R in the roll diameter, and from this variation △R, the amount of change in the outer diameter of the roll, that is, the roll profile is determined. It is.

Embodiment FIG. 2 is a front view of an apparatus according to an embodiment of the present invention, and FIG. 3 is a side view of the same apparatus.

In Figures 2 and 3, (1) is the roll to be measured, 2)
(3) is a pedestal horizontally installed parallel to the roll to be measured (1), (3) is a sensor scanning rail installed on the pedestal (2), and (4) is a reciprocating carriage mounted so that it can run on the pedestal (3). , 5) is the sensor head vertically installed on the carriage (4), (6) is the sensor (water column ultrasonic distance meter), <7) is the reciprocating drive mechanism, (7-1,) is the ball screw, (7) -2) is a guide rod, (7-3) is a scanning motor, (8) is a pulse generator for position detection, (9) is a calculation device, and (1o) is a profile display device.

That is, by driving the scanning motor (7-3), the pole screw (7-1,) directly connected to the motor rotates, and the carriage (4) reciprocates in the direction of the roll axis. There is.

In addition, three sensors (6) are mounted on the surface of the sensor head (5) facing the roll (1) at equal intervals toward the center of the cross section of one call, at a required distance from the roll surface. There is.

The measured values from each sensor (6) are input to the calculation device (9), and the variation ΔR of the roll diameter is calculated based on the above equation (8). The rotation speed of the scanning motor (7-3) is detected by the pulse generator (8), and the rotation speed of the scanning motor (7-3) is detected by the pulse generator (8).
), and the position of the sensor (6) in the roll axis direction is calculated. This is how the roll profile is measured. The measured near feel is displayed on the near feel display device (10).

According to the detailed description of the invention, in this invention method, the distance measuring means is placed toward the center of the cross section of the roll to be measured, so that
It is possible to measure perpendicularly 1r to a constant plane of 1lilJ for the change of coil f, and the distance to the roll surface can be measured with high accuracy.As a result, measurement errors due to sensor play and roll eccentricity can be completely eliminated, resulting in high accuracy of the roll profile. Measurement becomes possible.

Further, since the device of the present invention has a simple mechanism and uses a method that measures three points simultaneously, it has the excellent effect of being able to measure objects in a dynamic state with high precision.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the principle of the measuring method of this invention, Figure 2
The figure is a front view showing an example of the configuration of an apparatus for carrying out the method of the present invention, and FIG. 3 is a longitudinal sectional side view taken along the line lTl-lTl. ]... Roll to be measured 2. Mount 3. Scanning rail 4.. Reciprocating table 5 Sensor head
6...Sensor 7...Reciprocating drive mechanism 8-Pulse generator for position detection 9...Arithmetic unit 10/P1 Cofeel display device Applicant: Sumitomo Metal Industries, Ltd.

Claims (1)

[Claims] 1. The distance between the devices and the roll surface is measured by three distance measuring devices placed close to the roll surface toward the center of the circular roll cross section in the same plane as the roll cross section. A roll profile measuring method characterized in that the amount of change in the outer diameter of the roll is calculated and determined from the amount of change in the measured value. 2 Distance between three machines that are placed in the same plane as the cross section of the roll, close to the roll surface toward the center of the cross section of the circular roll, and movable parallel to the roll axis, and that measure the distance between them and the roll surface. - A roll profile measurement characterized by comprising a measuring device and a calculation means for calculating the amount of change in the outer diameter of the roll from the amount of change in the distance measured by the distance measuring device between the device and the roll surface. Device.