JPH09280853A - Thickness measuring method of railroad rail column section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately measure the thickness of the column section of a rail and to accurately discriminate acceptability by providing a threshold value and eliminating the column section thickness value of the roll mark section by providing window in the data processing. SOLUTION: Laser distance measuring devices 1a and 1b measure the positions of the rail side surfaces. A controller 4 converts the measured signals from the devices 1a and 1b into digital data for every pulse signal generated by a speedometer 3 at a constant distance, i.e., for every prescribed amount of the movement of a rail 2 and gives the data to a computer 6. The computer 6 successively writes the data into a memory. Then, the thickness of the column section of a railroad rail is continuously computed and a threshold value is provided for the difference between the current and the previous measurements. If the difference is larger than the threshold value or equal, the current computed value of the column section thickness is replaced by the previously computed value and the column section thickness value of the roll mark section is eliminated. Moreover, by providing a window in the data processing, range of the roll mark section is determined and the replaced column section thickness computed value of the roll mark section, which becomes the trouble during the computation of the acceptability discrimination, is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rail rail manufacturing line, in which the column thickness measurement value of the roll mark portion is removed when measuring the column thickness in the longitudinal direction of the rail side face during transportation. The present invention relates to a method for determining pass / fail of part thickness.

[0002]

2. Description of the Related Art Conventionally, the thickness of the pillar portion of a railroad rail has only been measured by a human hand at the end of the rail with a micrometer. However, due to the sophistication of the demands from customers, it becomes necessary to measure the entire length, and as shown in FIG. 1, two column distance meters, for example, spot type laser rangefinders 1a and 1b are used to measure the column thickness over the entire length of the rail 2. I was trying to measure. In addition, in the pass / fail judgment of the pillar thickness, the pillar thickness measured by the method of FIG.
It was done depending on whether it was within the tolerance range of the side.

[0003]

However, as shown in FIG. 2 (a), a character indicating the standard of the rail, called a roll mark 7, is formed on the pillar portion of the rail as shown in FIG. 2 (b). It is formed to be larger. Therefore, when the column thickness of the entire length is measured by the method of FIG. 1, the portion where the column thickness is thicker than the original thickness due to the roll mark is also included in the pass / fail judgment target, which causes a problem that accurate pass / fail determination cannot be performed. It was happening. Also, the roll mark characters cannot be removed by removing data at a fixed length and interval because the number of characters and the repeating pitch differ depending on the rail specifications, production month, and rolling roll diameter of more than 20 types. There was a problem.

The present invention has been made to solve the above problems, and in the continuous measurement of the column portion thickness including the roll mark in which the number of characters and the roll mark generation pitch change depending on the rail rail standard and the production month. By removing the roll mark portion, it is intended to accurately measure the thickness of the pillar portion of the railroad rail and to accurately perform pass / fail determination.

[0005]

The first invention is obtained by continuously calculating the thickness of the pillar portion of a railroad rail from the data continuously measured online by a laser distance meter in the longitudinal direction. A threshold value is set for the difference between the present and the previous calculated column portion thickness values. When the difference is larger than or equal to the threshold value, the calculated column portion thickness value at this time is replaced with the previously calculated value, and the column portion thickness value of the roll mark portion is removed.

A second aspect of the present invention is the continuous measurement of the thickness of the pillar portion of a railroad rail, which is measured on-line. By providing a window for data processing in the part to be performed, the range of the roll mark part is determined, and the calculated column part thickness of the replaced roll part of the roll mark part, which becomes an obstacle when calculating the pass / fail judgment of the post part thickness It is characterized by performing removal.

By the way, the pillar thickness measured on the side surface of the rail is fixed at a constant interval based on the speed meter for measuring the rail transport speed by arranging the distance meters 1a and 1b at intervals L in the width direction of the rail as shown in FIG. It can be measured by calculation from the measured values of the rangefinders 1a and 1b (here, 10 mm intervals) and the interval L.

At this time, since the measured value of the column portion thickness in the rail longitudinal direction contains many noises, the moving average process is performed by the controller 4 of FIG. Therefore, the actual shape of the cross section of the roll mark in FIG. 3 (b) provides a somewhat smooth measured value of the pillar portion of the roll mark as shown by the solid line of the measured value of the roll mark cross section in FIG. 3 (c). . However, it is clear that the measured value is higher than the column thickness of the portion without the roll mark shown as the X-axis in the graph of FIG. 3C, and the portion where the column thickness changes to the larger one. Must be removed. The column portion thickness is calculated as follows from a data group at a constant interval (here, 10 mm interval) loaded into the calculator 6 of FIG. T = L−L _ws −L _ds (1) Here, T: column thickness L: laser distance meter interval L _ws : _workside laser distance meter measurement value L _ds : drive side laser distance meter measurement value.

[0009] The data group of the column portion thickness values after the calculation is completed as D _n, the difference between the data of adjacent ones of the data groups D _n
Assuming −D _{n + 1} , the following condition | D _n −D _{n + 1} | ≧ γ (2) However, when γ satisfies the threshold value, D _{n + 1} is replaced with the immediately preceding data D _n . That is, D _{n + 1} = D _n , and the replaced data D _{n + 1} is not used for calculation of the maximum value, the minimum value, and the average value used for the pass / fail judgment of the column thickness.
That is, here, the data of the measured value of the column portion thickness of the roll mark portion is removed.

Next, in determining the continuity of the roll mark portion, the roll mark is composed of several individual characters as shown in FIG. 2 (a). Repeated on the side of the rail as long as its length allows. Therefore, if the removal processing of the roll mark part is performed by the above logic. For example, point A in FIG.
_The point where _{n + 1} = D _{n + 1} is the point where the data has not been replaced, and the roll mark is once interrupted here. However, in reality, it is necessary to confirm that the roll mark is interrupted several times in succession.

Therefore, as shown in FIG. 3 (c), a window α for data processing for monitoring whether or not the next roll mark appears is provided to replace the data, and whether D _{n + 1} = D _n occurs. To monitor. In other words, when the data replacement occurs between these α, it means that the roll marks are continuous, and therefore the data replacement, that is, the roll mark part removal processing is continued. If the data replacement does not occur between α, it means that the roll mark portion is completed, and thereafter, the column portion thickness measurement data other than the window α portion becomes the object of the pass / fail judgment.

[0012]

Embodiments of the present invention will be described with reference to the drawings. In FIG. 1, 1a and 1b are spot-type laser rangefinders used for measuring the thickness of rail pillars, 2 is a rail for rails, 3 is a laser-type speedometer for measuring the transportation speed of rails, 4 is a rangefinder and speedometer Controller 5 is A /
The D converter, 6 is an arithmetic unit. Two laser rangefinders 1
a and 1b are installed perpendicular to the rail transport direction.
The laser rangefinders 1a and 1b measure the position of the rail side surface as the position of the laser spot changes. The controller 4 controls the laser rangefinder 1 for each pulse signal generated by the speedometer 3 at a constant distance, that is, for each predetermined amount of movement of the rail 2.
The measurement signals of a and 1b (position signals in the rail width direction) are converted into digital data and given to the computer 6. The computer 6 sequentially writes the data in the memory.

The computer 6 is a memory laser rangefinder 1a,
Based on the measurement data of 1b, the column thickness of the rail is calculated, and the pass / fail judgment of the rail quality is performed. This process is S in FIG.
1 to S4.

By the measurement by the laser rangefinders 1a and 1b (S1 in FIG. 4), the data of each rangefinder is stored in the memory of the computer 6, and after the following calculation, the data in FIG. The column thickness value such as) is stored. T = L−L _ws −L _ds (1) Next, the difference between D _n and the adjacent data D _{n + 1 in} the data group of the column thickness value in FIG. Set γ and compare. | D _n −D _{n + 1} | ≧ γ (2)

When the condition of the expression (2) is satisfied, D _{n + 1} =
It is set to D _n and replaced with the immediately preceding data. D at this time
The original value of _{n + 1 is} the column portion thickness value measured by the laser range finder of the roll mark portion, which is a problematic value when it is used for the pass / fail judgment, and therefore is removed in this process. Furthermore, the data D _{n + 1} after being replaced is the maximum over the entire rail length,
Do not use as data when calculating minimum and average values.
The above data is replaced while the roll marks continue, but when the roll marks disappear, the data shown in FIG.
As in B of (c), D _{n + 1} = D _{n + 1} and the data replacement is completed.

However, as shown in FIG. 2A, the roll marks are continuous for a certain length, and the length of the roll marks and the pitch generated vary depending on the rail standard, the month of production, and the diameter of the rolling roll. Therefore, in order to determine whether or not the roll mark portions are continuous, a data processing window α for monitoring the continuity of the roll mark portions is provided as shown in FIG. Watch for replacements. For example, at the position of the rail length of 40 mm in FIG. 3 (c), D _{n + 1} = D _{n + 1} once and the data replacement is completed, but again at the next 50 mm position within the range of α, Data replacement of D _{n + 1} = D _n is performed. This means that the roll marks are continuous, and the data replacement process, that is, the roll mark part removal process is continued. The recognition that the roll marks do not continue for a while is made only when the data has not been replaced within the range of α after the position of 100 mm in FIG.

By repeating the above process over the entire length of the rail, the roll mark part removing process is completed, and the quality judgment is performed based on the column part thickness measurement value other than the removed part.

[0018]

According to the first aspect of the present invention, it is possible to remove the column portion thickness measurement value of the roll mark portion, which becomes an obstacle when trying to make a pass / fail judgment by continuously measuring the column portion thickness in a rail manufacturing line. Will be possible. Therefore, accurate and highly reliable inspection can be performed, the entire length and 100% inspection can be easily performed without lowering the efficiency of the manufacturing line, and the rail manufacturing quality can be improved.

According to the second aspect of the present invention, even if the continuous length of the roll mark portion is arbitrarily changed depending on the rail specification, the month of production, and the diameter of the rolling roll, it is possible to accurately determine the pass / fail of the column portion. All rails and all standards can be inspected without reducing the efficiency of the refining line, and the rail manufacturing quality can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of a device configuration for implementing the present invention.

FIG. 2A is a diagram showing a continuous state of a roll mark portion, and FIG. 2B is a cross-sectional view of a rail showing a column thickness of the roll mark portion.

FIG. 3A is a diagram showing a roll mark, and FIG.
FIG. 6A is a diagram showing a sectional real shape of a roll mark, and FIG. 7C is a diagram showing a process of removing a roll mark portion.

FIG. 4 is a flowchart showing the contents of pillar portion thickness value calculation and roll mark processing of the controller 4 and the computer 6 shown in FIG.

FIG. 5A is a column thickness profile of the entire rail length before roll mark processing, and FIG. 5B is a column thickness profile of the entire rail length after roll mark processing.

[Explanation of symbols]

 1a, 1b: Spot type laser range finder 2: Rail 3: Speedometer 4: Sensor controller 5: A / D converter 6: Calculator 7: Roll mark γ: Threshold α: Data processing window

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoichi Kuboyama 20-1 Shintomi, Futtsu City, Chiba Shin Nippon Steel Co., Ltd. Technology Development Division

Claims (2)

[Claims] 1. A railroad rail post thickness measuring method for continuously and continuously measuring the side post thickness of a rail for rail having a roll mark portion on the side post, in a laser range finder. Sample the data continuously measured at regular intervals, take the difference between the previous value and the current value of the obtained successive column thickness calculation values, compare the absolute value of the difference with the preset threshold value, and When it is greater than or equal to, the railway rail column thickness measurement method is characterized in that the column thickness calculation value this time is replaced with the previous calculation value, and the column thickness value of the roll mark is removed for measurement. 2. The column thickness value of the roll mark portion is removed, a window for data processing is provided, the range of the roll mark portion is determined, and the column thickness value at which the roll mark portion is replaced is set to the column portion thickness value. The rail rail column thickness measuring method according to claim 1, wherein the method is excluded from the calculation of maximum, minimum, and average for the pass / fail judgment.