JPS6221058A - Transporting system of specimen - Google Patents

Abstract

PURPOSE:To enable efficient flaw detection, by setting a skew angle according to the specified equation depending on preset target feed pitch and specimen diameter, and correcting and controlling the skew angle in such a way that a transporting speed becomes the target-transporting speed defined by the preset target feed pitch and target peripheral speed. CONSTITUTION:A controller 7 performs arithmetic operation of a skew angle by the specified formula on the basis of an outside diameter numerical data of the specimen from a computer 11 and drives a skew angle adjusting motor 13 in such a way that it assumes the skew angle. next, the number of revolutions of a motor 8 is so adjusted that a peripheral speed of the specimen transported by a skew roller 1 set to the skew angle becomes the specified peripheral speed. Then, the transporting speed is calculated by a speed calculator 10 on a detecting signal from a photoelectric tube 14 and data of speed detecting encoder 9 of the motor 8 and the result is introduced into a controller 7 as an input. On the other hand, as the controller 7 drives again a motor 13 by obtaining a ratio of target-transporting speed and actually measured one, readjustment of the skew angle is unnecessitated and highly efficient flaw detection becomes available.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method of spirally conveying a material to be inspected with high precision during, for example, ultrasonic flaw detection.

(Prior art) A method of spirally transporting a material to be inspected with a circular cross section is widely used in non-destructive testing equipment that scans the entire circumference while fixing a sensor. The relationship between the dimensions of the sensor and the feed pitch of the inspected material is extremely important, and the feed pitch must be set with high precision. In other words, if the feed pitch is larger than the sensor size, uninspected areas will occur, and
This is because, in the opposite case, the inspection portions will overlap and the inspection efficiency will decrease.

By the way, the conventional setting of the feed pitch is based on the skew angle (angle between the axis of the inspected material and the rotating shaft of the skew roller) of the spherical four-wheeler (hereinafter referred to as "skew roller") based on the following formula 0. This was done by calculation.

P=πD@-θ (■]...■P2 target feed pitch (-/1 rotation of the test piece) However, D=External diameter of the test piece (m) θ Niskew angle (el Problems to be Solved) However, in the setting using the 0th equation.

As shown in Table 1 below, in reality, the error is large, so while the material to be inspected is conveyed in a spiral manner, continuous marking is performed using, for example, chalk, and the skew angle is repeatedly determined by actually measuring the mark pitch t. I had to readjust.

Table 1 - In other words, the actual feed pitch when spiral conveying is carried out at the skew angle set based on the above formula 0 to achieve the target feed pitch does not accurately match the target feed pitch as shown in Figure 3. As shown in the figure, by giving a skew angle ( ) and arranging the skew roller 1b at an angle α, the contact point χ between the inspected material 2 and the skew row 21b is shifted from the center line of the skew opening 1-21 from above. This is due to this.

The present invention has been made in view of the above problems, and allows the skew angle to be set to achieve the target feed pitch as possible.Therefore, there is no need to readjust the skew angle, and efficient flaw detection can be performed. The purpose of this invention is to provide a method for transporting materials to be inspected.

Precautionary Measures to Solve Problem C) The present invention provides a method in which a non-destructive inspection device spirally conveys a material to be inspected using skew rollers arranged upstream and downstream at a required interval. The target feed pitch and target peripheral speed of the material are determined in advance, and the skew angle of the skew roller is set based on the following formula according to the predetermined target feed pitch and the outer diameter of the material to be inspected, and then the skew angle is determined. This is a method for transporting a material to be inspected, the gist of which is to correct and control the skew angle so that the set transport speed becomes a target transport speed determined by the predetermined target feed pitch and target circumferential speed.

However, θ Ni-skew angle (I P: Target feed pitch (-/1 rotation of the material to be inspected) D: Outer diameter of the material to be inspected C) φ Diameter of the knee roller during varnishing (G) Distance between centers of the S-Ni-skew roller ( 11111 people: Correction coefficient In the method of the present invention, first, the target feed pitch and target circumferential speed of the material to be inspected are set in advance.Here, the target feed pitch is:
Set based on the dimensions of the sensor and taking into account the wrap rate, etc. Further, the target circumferential speed is set in consideration of the responsiveness of the inspection device. Subsequently, a skew angle is set according to the target feed pitch and the outer diameter of the material to be inspected.

In the method of the present invention, the skew angle is all set using the above-mentioned second equation for the reason described below.

The formula for determining the feed pitch for a fine rope is P: πDetu
It is expressed by θ×(f(φ, n, s>), and according to the inventor's first investigation, it is f[φ, D, 5)c(blood α.Here, α is the skew roller's This is the Nariko angle between the line connecting the centers and the line connecting the centers of one skew roller and the material to be inspected.

That is, as shown in FIG. 3, if the skew rollers 1& are arranged so that α=06, spiral feeding is not possible, so f(φ, D, S) ζ0.

In addition, when the skew roller 10 is arranged so that α=90@, the knee angle in the knee effectively acts and f(φ, D,
S) #t, so at this intermediate position f(φ+
We found that D + S ) < daα. Therefore, each distance can be found as shown in Figure 1 (b),
Therefore, blood α is expressed by the following equation 0.

-α=(φ/2+D/2)L-(S/2)Snow/(φ/
2+D/2)=W-A)/[φ+D)...■
Therefore, it is determined by the actual feed pitch per rotation of the strained material to be tested, and the 0th equation is obtained from this 0th equation. However, the feed pitch obtained by the above formula 0 does not take into account the feed speed or the slippage between the inspected material and the skew roller, so the formula 0 takes these into consideration and multiplies it by a correction coefficient A. Then, the skew angle is obtained. Here, A is determined by the roller material and the surface properties of the material to be inspected, and is, for example, 09 to 1.2 when a resin roller is used and cold force Ω is used to convey seamless steel pipes.

Next, the skew angle is set according to the above-mentioned formula 0, and the material to be inspected is spirally fed in t stages at the target circumferential speed, and the conveying speed (movement rate in the W-axis direction) at this time is actually measured.

On the other hand, the target conveyance speed VX1, which is determined by the target feed pitch p and the target circumferential speed V, is calculated in advance using the following formula.

vx = Yu to correct.

(Function) In the method of the present invention, the skew angle can be set to achieve the target feed pitch as efficiently as possible, and flaw detection can be performed efficiently without the need to readjust the skew angle.

(Example) The method of the present invention will be explained below based on an example shown in FIG. Note that the same numbers in FIG. 2 as in FIG. 3 indicate the same or equivalent parts.

On one surface, 3 is a skew roller 1 at a predetermined interval.
This is a transport table in which the transport table 3 is arranged with
For example, an ultrasonic flaw detection water tank 4 is installed in the center of the skew roller 1 to inspect the entire surface of the material to be inspected that is spirally conveyed by the skew roller 1.

By the way, the skew angle of the skew roller 1 is set by the skew angle adjustment motor 13.

The set skew angle is detected by the skew angle detection encoder 5, and the data is input to the controller 7 via the skew angle calculator 6. On the other hand, the rotation motor 8 VC of the skew roller 1 is detected by the speed detection encoder 5. An encoder 9 is attached, and data is input to the controller 7 via a speed calculator 10.

The method of the present invention in nine cases will be described below using the conveyance equipment for the inspected material configured as above. 0 First, setup change commands and information regarding the inspected material are input from the host computer to the computer I+. , the flaw detection part 12 is O
Sensitivity is set by the AL mechanism. - 10,000, the controller 7 calculates the skew angle based on the above-mentioned formula 0 based on the outer diameter dimension data of the material to be inspected from the computer 11, and drives the skew angle adjustment motor 3 so as to obtain the skew angle.

Next, the rotational speed of the motor 8 is adjusted so that the circumferential speed of the inspected material conveyed by the skew angle 4-21 determined by the 0th equation and set to 9 skew angles becomes the predetermined circumferential speed. do.

After setting the skew angle and circumferential speed as described above, conveyance of the inspected material is started.

Next, in order to measure the actual speed of the material to be inspected, detection signals from the nine photoelectric tubes 14 and the motor 8, which are arranged at predetermined intervals, are sent.
Based on the data of the speed detection encoder 9] speed calculator 1
Calculate the conveyance speed with 0 and input it to the controller 27.

On the other hand, the controller 7 calculates the target conveyance speed Vx using the above-mentioned formula 0, calculates the ratio (5) of the measured conveyance speed vy, multiplies this value by the formula 0, and returns the value to the skew angle adjusting motor 3. Drive i11+-g.

(Effects of the Invention) As explained above, the method of the present invention takes into account the deviation of the contact point between the skew roller and the material to be inspected due to changes in the skew angle, and then adjusts the skew angle according to the outer diameter of the material to be inspected. Since the setting is made and then finely adjusted according to the conveyance speed, the material to be inspected can be conveyed at the target conveyance speed without readjusting, thus improving the work efficiency of the exploration test. It has a great effect on

Incidentally, when the skew angle was set by the method of the present invention, the accuracy of the feed pitch was within ±5 of the target feed pitch.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the method of the present invention, (a) is a bottom view, (a) is a bottom view, (
b) is a side view, Fig. 2 is an explanatory diagram showing an embodiment of the method of the present invention, Fig. 3 is an explanatory diagram showing the drawbacks of the conventional method, (a) is a front view, and (b) is a plan view of the stile. . 1 is a skew roller, 2 is a material to be inspected. Patent applicant: Sumitomo Metal Industries, Ltd. Figure 2 (b)

Claims (1)

[Claims] (1) In a method of spirally conveying a material to be inspected using spherical rollers disposed upstream and downstream of a non-destructive testing device at a required interval, the target feed pitch and target circumferential speed of the material to be inspected are determined in advance. After setting the skew angle of the spherical roller according to the formula below according to a predetermined target feed pitch and the outer diameter of the inspected material, the conveying speed after setting the skew angle is set to the predetermined target feed. A method for conveying a material to be inspected, characterized in that the skew angle is corrected and controlled so as to reach a target conveyance speed determined by a pitch and a target circumferential speed. θ=A・tan＾−＾1；P(φ+D)/π・D√[(
φ+D)^2-S^2]} However, θ: Skew angle (°
) P: Target feed pitch (mm/one revolution of inspected material) D: Outer diameter of inspected material (mm) φ: Diameter of spherical roller (mm) S: Distance between centers of spherical roller (mm) A: Correction coefficient