JPS5992128A - Method for preventing running up of pipe expander head on inside bead of steel pipe - Google Patents

Abstract

PURPOSE:To prevent surely running up of a pipe expander head on an inside bead of a steel pipe by performing pipe expanding while correlating the position of an outside bead of a steel pipe to be expanded detected by a bead position detecting device with the position of a die groove of a pipe expander head. CONSTITUTION:The position of a die groove 6 of a head 5 of a pipe expander 4 inserted into a steel pipe 1 to be expanded is detected beforehand, and a die groove signal 16 is displayed as a reference signal on the picture display section 14 of a signal processing device. At the same time, the position of an outside bead of the steel pipe 1 is detected by a bead position detector consisting of a sectorial laser generator 9 mounted on a stand fixed to a stand 12 and an image sensor 10, and an outside bead signal 15 is displayed on the picture display 14 through the signal processing section 25 of the signal processing device. The deviation 24 between a die groove signal 16 and an outside bead signal 15 is calculated by the signal processing section 25, and estimation is made whether the pipe expander head 5 runs up on the inside bead of the steel pipe 1 or not, and the pipe expander 4 and the transportation device for the steel pipe 1 are controlled feed-forwardly.

Description

[Detailed Description of the Invention] J! ．． This is a method for preventing the pipe from riding on the inner surface of the pipe P.

7 [) One figure is a perspective view of the tube expander head placed on the inner surface of the steel pipe at the start of expansion a, where 1 is the steel pipe, 2 is the outer bead, and 2' is the inner bead 1-''. , 3 is a twisted weld seam, 4 is a tube expander, 5 is a tube expander spatula l', and 6 is a die groove for avoiding the inner surface bead P provided in the tube expander head.

Figure 2 is a cross-sectional view showing the state of the tube expander head and bead when the tube expander head rides on the tube inner bead. 2 is the outer bead %, 2' is the inner bead, and 6 is the tube expander head. 7 is a bead crack that may occur when the head of the 8-tube expander runs over the inner bead of the steel pipe in the base material of the steel pipe.

As shown in Figure 1, the die r1ψ of tube expander spatula #:'5
6. Is the inner bead of the steel pipe a die at the beginning of pipe expansion? Even if the pipe expansion is started by entering R, as the pipe expansion progresses due to the weld seam twist 3, the inner bead comes off from the die groove as shown in Fig. 2 and the die rides on the inner bead, and the bead 1 shown in 8: 'There may be a problem with the tow ratio.

This causes deterioration in the toughness of the weld, increased hardness of the weld, and increase in beaging.

The conventional method for preventing such a pipe expander spatula P from riding on the inner surface bead 12 of the steel pipe to be expanded is (a). Before starting pipe expansion, insert the pipe expander head into the inner surface of the steel pipe.
f) A method of aligning the tube expander head and the inner bead by visual inspection or by using an imaging device such as a television camera or the like.

Another possible method is to expand the pipe after removing the excess buildup from the opening and inner surface over the entire length of the weld line.

There is.

These conventional methods each have the following problems. First, in method A, the positioning accuracy is poor because the positioning is done by direct visual inspection, and the position cannot be confirmed during pipe expansion, and it is not possible to completely prevent the pipe expander head from riding on the inner bead of the steel pipe. Although it is desirable to mechanize the method in terms of worker environment and production efficiency, it is not practical because the device a for removing the inner bead along the entire length of the weld line is extremely large-scale.

It is an object of the present invention to address the shortcomings of the prior art and to completely prevent the tube expander head from riding on the i'I:4 tube inner bead 12 by introducing a small-scale device (d). 17.

The feature of the present invention is that when the tube is expanded, the relative position of the lightning expander Hetsu 1 and the Beer portal vein is set to Be 1? position (a) By monitoring with a monitoring device, the enlarged 'U + JA head is
It is possible to detect with high accuracy whether or not the position of the tube expansion machine spatula R and the outer surface bead P which is carried out at the start of tube expansion +111 is good or bad, and to take corrective measures in the subsequent tube expansion. This is possible.

The present invention uses a P1S position monitoring device consisting of a bead position detector and a signal processing device when expanding a steel pipe,
Detect the groove position of the tube expander head in advance,
Next, the position of the outer surface bead Y of the steel pipe to be expanded is detected, the die groove position and the outer surface bead position are compared point by point, and the pipe expansion is performed while observing that the inner bead enters the die groove accurately. This is a method for preventing a pipe expander head from riding on the inner surface of a steel pipe.

Embodiments of the present invention will be described below based on the drawings.

FIG. 2113 is a cross-sectional view showing the tube expansion situation in the apparatus using the method of the present invention, in which the steel tube is moved in the direction of the arrow (from the right to the left) while being supported by the traveling trolley 13. This is an example in which the bead position detector employs the optical cutting method, which is considered to be the most optimal in terms of detection reliability.

In FIG. 3, the detector for P1+p= is Ij7 from the fan-shaped laser generator 9 and the image sensor 10, which are supported on a pedestal 11, and the pedestal 11 is supported by a pedestal stamp P.
It is fixed at 12.

Figure 4 shows the beam 1 with the expander spatula 1 inserted into the inner surface of the steel pipe at the start of pipe expansion using the apparatus using the method of the present invention.
FIG. 2 is a schematic diagram of the area around the second row detector and the signal processing device 1t.

In FIG. 4, the signal processing device consists of an image display section 4 and a signal processing section 25, and 15 indicates the image displayed on the art dealer display section 14. signal (only (7; inner bead and [η
16 is displayed on the image display section 14 and enlarged.
゛? 17 is the IC c in the screen of the image display section 14; 18 is the center of the die groove of the tube expander spatula P on the screen of the image display section 14; 19 is the outer bead width on the screen of the image display section 14. 20 is the image display section 14
21 is the deviation between the screen center on the screen of the image display section 14 and the center of the goo groove of the tube expander spatula P, 21 is the deviation between the screen center on the screen of the image display section 14 and the center of the outer bead width, 22 is the deviation on the screen of the image display section 14 The groove width of the spatula P tube expander is 23.
is the outer bead 1 width on the screen of the image display section 14, 24
is the deviation between the position of the gouge groove width of the tube expander head and the position of the outer bead toe in the image (screen 14). That is, the main part of the bead position monitoring device using the method of the present invention consists of an H4-shaped laser generator 9, an image sensor 10, a frame 11 for supporting and fixing these, and a stamp px2. container and image display section 1
4 and a signal processing section 25.

Next, in the method of the present invention, Lli et al.) 1. Rubee 1'f planning 1
The device will be explained below.

The bead 6γ neck detector is preferably of a non-contact type in terms of its reliability. In particular, if the bead part is so smooth that it is difficult to visually distinguish between the bead part and the base material part, it is considered impossible to use a contact type (copying roll type, etc.).

It doesn't matter which method you use, but since the bead of steel pipes is generally smooth, the number of methods that can be used with VC is limited, regardless of whether it is a contact or non-contact method. .

As the beer position monitoring device used in the method of the present invention, a non-contact method other than the above-mentioned optical cutting method, which has been adopted as an optimal example, is used. There is a method of monitoring the bead position, but in this method, in order to easily distinguish between the bead and the base material when the bead is smooth, a thin line is placed at the boundary between the bead and the base metal. It is best to delineate it with a white line or apply colored slit light. However, regardless of the method, the constant bea 1' (1r
It is not a matter of guessing that any detector that can monitor ii' and l' will be fine.

The pedestal supporting the bead Qr IH detector needs to be free of hindrance in order to fully perform the functions of the bead position detector. As a point,
The play between the support frame 11 and the fixed stand 12 is approximately 1
Since it directly affects the visibility of g, it is necessary to make it robust enough to eliminate this backlash, and it must also be able to withstand photographing, etc. depending on the place of use.

- In general, there are many factories that can manufacture a wide variety of steel pipes, so even if the pipe size changes, the bead 6r position detector can be quickly adjusted to the optimal operating conditions.
In addition, in order to smoothly reset the hue, it is necessary to take measures such as remotely controlling the angle setting of the fan-shaped radar generator 9, the K configuration, and the adjustment mechanism of the optical system of the image sensor 10.

K, bead position 1ftt, 1ftt, detector is stuck. <In order to continue stable one-piled production, the shape of the steel pipe (bend, etc.) K bead position detector must be forced to follow (not included in the drawing) (No) - It is also necessary to consider the adoption of an automatic downward scanning mechanism.

The signal to be sent to the ``signal amount'' section is first recognized by the groove of the tube expander spatula P with the ``+''l Il# detector, and based on the obtained signal!■ Double the signal to unify it. .

By constantly monitoring the bee 1-′ position detector,
6111 It is estimated that the amount of signal generated when the signal is 1 is large due to the wide viewing field and the length of the steel pipe.
J] 1. Also, the position of the tube expander head on the inner surface of the steel pipe P
A bee that uses the method of the present invention to prevent baldness IF
J177 What is the timing for feeding the pipe expander using the monitoring device before a run-over occurs?

Since it has to be done in real time, Shinshishi-dokoro 1.1! It is desirable to introduce a microcomputer or minicomputer capable of high-speed processing into the central part of the system, but this may not be the case depending on the usage.

Next, the operation of the method of the present invention will be explained using an example in which the method of the present invention is used by employing a light cutting method as a bead position detector.

Dozu copper pipe 1 is located at the position indicated by the solid line in Figure 3, and B 1st place i”
7 Detector V Rossi 'l', f Observe die groove 6 of Iso head 14. ((()) and sends a signal to the signal transmission unit 25. The signal processing unit 25 obtains the unified Gt number and the base fIM number, and displays the guide groove signal 16 of the tube expander head on the image display unit 14. Further, the steel pipe 1 is advanced in the position direction indicated by the broken line by the traveling cart 13, and the bead position detector 1 sends the bead position detector 1 and bead 1? position signals to the signal processing unit 25. 18 to 23 are calculated by displaying the signal 16 and the external bead signal 15 and performing image analysis (7.Finally, the deviation 24 between the die groove position 1d of the tube expander head and the position of the external bead toe is calculated. It is calculated and recognized to evaluate whether the expansion I0 machine head P will run onto the inner bead of the steel pipe.

The evaluation signal is lazily forwarded to the pipe expander 4 and the traveling trolley 13, and if the evaluation is that it will "run over", the flow is automatically changed to the "repositioning" sequence, and If the evaluation is that it will not run over, then that's it! Change, expansion, and IT will proceed. Of course, it is also easy to automatically switch the pipe expander to manual operation at the point when the evaluation that the pipe will run over is made. Blue expansion has started
Then, the steel pipe 1 is further advanced to the left to the broken line position 11t, and the same monitoring operation is repeated.

When introducing a beer r position monitoring device to which the method of the present invention can be applied, if the outer surface beer r cannot represent the position and size of the inner surface bead +2 in the target steel pipe, the tube expander spatula P as a reference signal may be used. die groove signal or outer surface peel r
It is necessary to correct the signal in advance.

By introducing a bee P position monitoring device to which the method of the present invention can be applied, it has become possible to completely prevent the tube expander spatula P from riding on the inner surface of the steel pipe bee p, and the following effects have been obtained.

B. It has become possible to completely prevent peedo cracks that occur due to the tube expander head running over the inner bead of the steel pipe, as shown in FIG. 2.

1- to prevent quality deterioration caused by the pipe head + W running onto the inner surface of the steel pipe P.

No. 1 As an additional effect, it is possible to save the labor of the operator who is permanently stationed on the side of the pipe expanding machine.

As described above, the method of the present invention is based on the inner surface bead 1 of the tube expander spatula P.
This prevents the build-up of steel pipes to 1-2, ensures the quality of the steel pipe, and also contributes to cost reduction and labor saving, resulting in L3.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the state at the start of pipe expansion, and FIG. 2 is a perspective view showing the state when the inner surface bead r is removed from the die groove.
FIG. 3 is a schematic diagram of the P-P position detector and tube expander according to the method of the present invention, and FIG. 4 is a schematic diagram of the apparatus according to the method of the present invention. 1...Steel pipe, 2...Outer surface bee P% 2'...Inner surface bee #:'', 5...Pipe expander head, 6...Gouging groove,
9... Fan folding laser generator, 10... Image sensor, 14... Screen 1 display section, 25... Signal processing section. Agent: Patent attorney Masamitsu Akizawa and 2 others

Claims (1)

[Claims] (1) When expanding a steel pipe, a bead position monitoring device consisting of a P-P position detector and a signal processing device is used to detect the die groove position of the pipe expander head in advance, and then expand the pipe first. The pipe expansion is performed by detecting the position of the outer bead 13 of the steel pipe to be processed and comparing the die groove position and the outer bead P position point by point to ensure that the inner bead P enters the die groove accurately. A method for preventing the pipe expander Hera P from running over the inner surface of the steel pipe.