JPH02143103A - Measuring instrument for internal bead cut shape of resistance welded tube - Google Patents

Abstract

PURPOSE:To detect the cut shape of an internal bead in three dimensions and to realize high-accuracy measurement by displacing a detection roller in its height direction while moving the roller slantingly. CONSTITUTION:An internal bead cutter 6 is adjusted to the height of an internal bead position and when the internal bead beings to be cut, the detection roller 11 is made to abut on the weld line of the cut part of the internal bead. Here, a servomotor 17 is rotated forward and backward with an external signal and then a screw shafts 19 rotates forward and backward to make a movable member 20 at right angles to the tube axial direction together with an arm 12, so that the detection roller 11 moves laterally around a shaft 14 as an axis of rotation. Consequently, the detection roller 11 moves slantingly at the internal bead cut part about the weld line because of the relative relation between the moving seam welded tube and the stationary bead cutter 6 and the current moving position of the detection roller 11 is detected by a lateral movement position detecting means 25.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an apparatus for measuring the cutting shape of an inner bead of an electric resistance welded pipe.

<Prior art> Conventionally, in the production of electric resistance welded pipes, as shown in FIG. is,
The tube is compressed by a squeeze roll 4 to form an electric resistance welded tube IA, which is then subjected to boss annealing, correction, etc., and then cut to a desired length to produce a product.

The outer bead and inner bead that are generated when pressed against the squeeze roll 4 are immediately cut off by an outer bead cutter 5 and an inner bead cutter 6, respectively. This inner bead ring is attached to the tip of a rod 8 whose one end is fixed to a fixing part 7 attached to a position where the edge spacing of the oven vibe IA is wide open.

By the way, this inner bead may tear in the circumferential direction of the tube due to variations in the thickness of the strip or poor shape, and the inner bead cutter 6 cannot follow it completely and cuts the inner surface of the tube, which may affect the quality of the product. There is a problem that the yield is adversely affected. Therefore, monitoring and optimizing the cutting condition of the inner bead is an important factor in manufacturing the electric resistance welded pipe.

In order to monitor the cutting status of the inner bead, for example, as disclosed in Japanese Utility Model Application Publication No. 58-240G2, a tg is attached to the tip of a rond that is long protruded into the tube from the oven pipe position in front of the tg. A detector for detecting the condition of the inner surface of the tube by optical means through amorphous contact may be provided at the tip of the inner cutting tool, or a detector provided on the outer periphery of the tube as disclosed in Japanese Patent Application Laid-Open No. 56-35057. A method has been proposed in which an ultrasonic thickness gauge is periodically moved in the pipe circumferential direction around the inner bead portion, and the trajectory of the thickness is used to determine the shape of the inner surface cut.

<Problems to be Solved by the Invention> However, with the former method of Utility Model Application No. 58-24062, installation is difficult in the case of small-diameter pipes, and since the detector is a non-contact type, welding is not required. There is a problem in that visibility is poor due to the bits and fumes that sometimes occur, making it impossible to detect accurately.

In addition, in the latter method of JP-A-56-35057, it is necessary to detect the bead immediately after it is cut after welding and feed it back to the position control of the inner bit. (Since the temperature is over 1°C, placing an ultrasonic thickness gauge near the weld bead requires the use of a large amount of acoustic coupling water, which requires rapid cooling of the bead cut. This is not desirable from a quality standpoint.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a device suitable for detecting the cut shape of an inner bead of a welded portion of an electric resistance welded pipe.

<&! Means for Solving the Problem> The present invention is an apparatus for measuring the cut shape of an inner bead of an ERW pipe in which the butt portion is welded along the pipe axis direction and the bead is cut with a bead cutter. An arm that extends in the axial direction and is provided with a detection roller 2 at its tip that comes into contact with the first position after cutting, the other end of which is pivotally supported, and a 4R1 that moves this arm in a direction perpendicular to the tube axis. ″r
an inner surface bead cutting of an electric resistance welded pipe, characterized in that the inner surface bead cutting of an electric resistance welded pipe is made up of: a 1λ row position detecting means for detecting the traverse position thereof; and a height position detecting means for detecting the position in the height direction of the bead position contacting means. It is a shape measuring device.

According to the present invention, the detection roller is caused to move laterally around the inner bead portion, and the lateral position of the detection roller when it moves laterally and the height direction position of the detection roller at that time are simultaneously adjusted. Since the detection is performed, the inner bead cut portion can be measured periodically in three dimensions.

Furthermore, since the entire device is constructed mechanically, it can be installed close to the bead cutter, and by feeding back the measurement signal, the position of the bead cutter can be controlled quickly.

<Example> An example of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side view showing an embodiment of the present invention, and FIG. 2 is a plan view thereof.

In the figure, the detection roller II is pivotally supported at the tip of an arm 12, and this arm 12 is supported via a pin 16 by an arm support member I5 attached to a shaft 14 erected on a pedestal 13.

Approximately the middle part of this arm 12 has one end connected to the servo motor 1.
A screw that is directly connected to 7 and whose other end is supported by a bearing 18? It is supported via a pin 21 by a movable member 2o that is screwed into the dl19. Note that the servo motor 17 and the bearing 18 are fixed to a support base 22 that is fixed on the frame 13.

Furthermore, a height position detection means 23 such as a differential transformer type position meter is provided at the lower end of the shaft I4, and between this height position detection means 23 and the arm support member ]5,
An elastic member 24 is interposed. Thereby, the position of the detection roller 11 in the height direction is detected.

Further, a transverse position detecting means 25 such as a sershin oscillation 2 is coupled to a shaft of the servo motor 17 on the opposite side of the screw shaft 19. By detecting the rotation angle of the servo motor 17, the movement position of the arm 12 in a direction perpendicular to the tube axis direction, that is, the transverse position is detected.

Note that the pedestal 13 is attached to the tip of the inner bead cutter 6 via a plurality of bolts 26 .

The operation of the inner bead cutting shape measuring device configured as described above will be explained below.

When the inner bead height is adjusted to the height of the inner bead position and cutting is started on the inner surface, the detection roller 11 comes into contact with the weld line of the cut portion of the inner bead. Therefore, when the servo motor 17 is rotated forward or backward by an external signal, the screw shaft 9 rotates forward or backward, the movable member 20 moves in the direction perpendicular to the tube axis direction together with the arm I2, and the detection roller 11 rotates around the shaft 14. Move horizontally using the axis of rotation.

Then, T! is moving! Li! Due to the relative relationship between the pipe IA and the stationary inner bead cutter, the detection roller 11 moves obliquely through the inner bead cutting portion with the weld line as the center. The moving position of the detection roller 11 at that time is
It is detected by the lateral f-te position detection means 25.

Therefore, if there are irregularities in the cutting part, the detection roller 11 will move in the vertical direction using the bin 21 attached to the movable member 20 as a fulcrum, which will cause the arm support member 15 to move in the opposite direction. , the elastic member 24
The change in the elastic force of is transmitted to the height position detection means 23,
The moving position of the detection roller 11 in the height direction is detected.

In this way, by simultaneously detecting the horizontal position and the height position of the detection roller 11, it is possible to three-dimensionally measure the cutting shape of the inner surface and the first hole.

<Effects of the Invention> According to the present invention, the cutting shape of the inner bead can be detected in three dimensions by moving the detection roller obliquely and displacing it in the height direction, thereby achieving highly accurate measurement. Therefore, it is possible to quickly control the cutting position of the inner bead cutter.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of the present invention, and FIG. 2 is a side view showing an embodiment of the present invention.
The plan view of FIG. 1 and FIG. 3 show a conventional example (Q factor. i) FIG. ... Arm 13 ... Frame, !4 ... Axis 15 ... Arm support member 7 17 ... Servo motor (traversing means) 19 ... Screw shaft, 21 ... Moving part t-o. 23...Height position detection means 24...Elastic member 125...Movement position detection means 6 Fig. 2

Claims (1)

[Claims] This is a device that measures the cut shape of the inner bead of an ERW tube, which is made by cutting the bead with a bead cutter after welding the butt part along the tube axis direction. an arm having a detection roller that comes into contact with the bead position of the pipe and whose other end is pivotally supported; a traverse means for moving the arm in a direction perpendicular to the tube axis; a traverse position detection means for detecting the traverse position; An apparatus for measuring the cut shape of an inner bead of an electric resistance welded pipe, comprising a height position detection means for detecting a position in the height direction of the bead position contact means.