JPS582553Y2 - Inspection device for flash butt welds - Google Patents

Description

[Detailed description of the invention] This invention is used in steel strip processing lines such as plating lines and annealing lines for cold-rolled steel sheets, for example, to remove burrs from welded areas after flash butt welding for joining steel strips. This invention relates to improvements in deburring and inspection equipment that performs ultrasonic flaw detection.

Traditionally, cold-rolled steel plate plating lines and baking lines were used. In a copper strip processing line such as a steel strip line, as shown in Fig. 1, the joint ends of the front and rear steel strips are aligned with a cutting machine E, and are joined by flash butt welding with a welding machine A. The welded portion is sent to a deburring device C for deburring.

Further, the welded portion is subjected to ultrasonic flaw detection using an ultrasonic flaw detection device to judge whether the weld is good or bad.

If it is determined that the welding is defective, the welded part that has retreated is cut and removed again by the cutting machine E1, and the above-mentioned joining and inspection are repeated.

As mentioned above, in the conventional method, deburring after welding and weld inspection are performed separately in two steps, which takes a long time and affects the operation of the steel strip processing line, so the steel strip accumulator device must be made larger. etc., to compensate for time.

In order to eliminate such drawbacks, the present invention proposes a device in which a deburring device after welding and an ultrasonic flaw detection device are configured to work together, and can perform deburring and defect inspection in one process. .

That is, the present invention uses a device that uses ultrasonic flaw detection to inspect flash butt welds where copper strips are joined, and includes a clamp and a cutting tool for holding down the vicinity of the welded portion of the steel strip. The gist is that a deburring device that reciprocates and an oblique ultrasonic flaw detection device in which a probe moves in parallel with a delay with respect to the cutting tool of the deburring device are installed side by side.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 2 and 3, the scraping device C is
A clamp 3 for holding down the front and rear vicinity of the joining weld of the steel strip B from above and below and guiding the bit roller, and a piston rod 2 of a cylinder 4 located above the weld and fixed on the machine base.
It consists of a cutting tool 1 attached to the tip of a cylinder 4, which reciprocates along the welding line by the operation of a cylinder 4.

Further, an oblique ultrasonic flaw detector is attached to the tip of the piston rod 6 of the cylinder 7 which is arranged parallel to the cylinder 4.

The present invention uses an oblique ultrasonic flaw detection device, but this device requires liquid to be filled between the oscillator and the object to be inspected.

However, when the flaw detection probe is slid at high speed, it is difficult for the contact medium liquid layer to follow the probe, and an air layer is likely to be present. Therefore, a rotary probe that does not have this drawback is used.

The rotary probe 5 has a vibrator suspended and fixed on the central shaft in a rubber tire, and is filled with liquid such as water or oil, as shown in FIG. Ultrasonic waves (plate waves) are transmitted and received from the contact point of the tire to the welded part of the copper strip.

When the cylinder 7 operates, the tire rotates and moves, but at this time, the oscillator and receiver suspended inside the tire are located close to the steel strip and do not rotate.

The cutting tool of the deburring device C and the probe of the ultrasonic flaw detector are allowed to reciprocate in parallel, but at this time, the probe 5 moves behind the tooling tool 1 while maintaining a constant distance. You need to configure it like this.

Therefore, in the embodiment shown in FIG. 2, the installation positions of the cutting tool 1 of the deburring device C and the probe 5 of the oblique ultrasonic flaw detector are shifted from each other to maintain a constant distance between them. 7 are operated at the same time, and the probe 5 is moved with a delay.

Therefore, if the probe of the oblique ultrasonic flaw detector moves parallel to the cutting tool of the deburring device C with a delay, other means may be used.

When the welded part of the joined steel strip reaches the deburring device C of the present invention, after stopping the movement of the steel strip, the steel strip is held down with the clamp 3 and clamped from above and below, and the cylinders 4 and 7 are operated simultaneously. While deburring is carried out using the cutting tool 1 of the deburring device C, defects in the welded portion are simultaneously inspected using the probe 5 of the oblique ultrasonic flaw detector, which moves in parallel after a delay.

When a defect is found in a welded part, the welded part is returned to position 1 of the cutter E, the welded part is cut out, and the welding and inspection are repeated again.

As mentioned above, the present invention performs welding deburring and welding defect inspection using oblique ultrasonic flaw detection in one process, so there is no need for extra time for inspection as in the conventional method. The time required for this process can be shortened, and the workability of the copper strip processing line can be significantly improved.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the outline of a conventional copper strip welding button and inspection device, Fig. 2 is a plan view of the deburring device and oblique ultrasonic flaw detection device of the present invention, and Fig. 3 is an enlarged side view of the same. be. In the figure, 1...Bite, 2, 6...Piston rod,
3... Clamp, 4. T... Cylinder, 5... Rotating probe, A... Welding machine, B... Steel strip, C... Deburring device, D... Oblique ultrasonic flaw detection device, E... ··Cutting machine.

Claims (1)

[Scope of utility model registration request] A device for inspecting a flash butt welded joint with a steel probe by ultrasonic flaw detection, which comprises a clamp and a cutting tool for holding down the vicinity of the welded portion of the steel strip, and the cutting tool reciprocates along the weld line; A device for deburring and inspecting flash butt welds, characterized in that an oblique ultrasonic flaw detection device whose probe moves parallel to the cutting tool of the deburring device is installed in parallel.