JPS6150254B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for ultrasonic flaw detection for defects on the surface of a steel piece, and in particular, an automatic flaw detection device that is capable of performing highly accurate flaw detection over the entire surface of a steel piece, including the edges. Regarding ultrasonic flaw detection equipment.

Surface flaws on steel slabs such as blooming slabs and continuously cast slabs are detected by visual inspection or ultrasonic flaw detection using a tire probe. When using a tire probe, the contactor is sequentially scanned across the surface of the steel piece in a zigzag pattern to cover the entire inspection surface. If it comes off, smooth flaw detection cannot be performed, so generally the traverse path has to be reversed before the edge, which has the drawback that complete flaw detection at the edge cannot be performed in practice. .

An object of the present invention is to provide an ultrasonic flaw detection device that can eliminate the drawbacks of the prior art, thereby improving the quality of flaw detection.

The device of the present invention is characterized by the structure of the mechanism for holding the tire probe and the use of a guide stand device for stabilizing the probe scanning path.

As shown in Fig. 1, a tire probe (hereinafter referred to as a probe) 1 is capable of moving up and down in the vertical direction by a cylinder 21 fixed to a transverse block 2. Only the holding part 22 is structured to be able to rotate independently. The rotation of a reversing motor 23 fixedly installed in the traversing block 2 is transmitted to the tip holder 22 through a gear mechanism 24, thereby giving the probe 1 a turning motion at a predetermined angle. It is becoming possible to do this.

The transverse block 2 is slidably supported by a pair of support shafts 31 fixed in parallel to an arch-shaped frame 3 in the form of a bridge, and can be moved transversely by rotation of a screw shaft 32. . The mount 3 runs on rails 33 provided along the longitudinal direction of the specimen 6, and moves forward and backward relative to the probe 1 through the combined operation of these mechanical parts. , a lateral movement, an elevating movement, and a turning movement can be applied individually or in combination at the appropriate time.

The guide stand device 4 is disposed at the center of the pair of rails 33, has a base 41 on which the specimen 6 is placed as a base, and extends along the longitudinal direction from this base mounting surface. A pair of elongated tab plates 42 are provided on the left and right sides that protrude. The bottom end of the tab plate 42 is the base 41
It is screwed onto a left-right symmetrical reverse threaded shaft 43 provided on the back side of the handle, and the distance between the pair of members can be adjusted by operating a handle 44, and as shown in FIG. It is also possible to adjust the height. The tab plate 42 is adjusted to be extremely close to the side edge of the material 6 to be inspected on the base 41, and the height of the upper surface is adjusted according to the thickness of the material to be inspected, so that the height of the tab plate 42 is closely aligned with the material surface. Adjustments are made so that the top surface is flush with the top surface.

In the present invention, as shown in FIG. 6, a control device 5 is provided which instructs the holding mechanism of the probe 1 to operate, and set values are set in the control device 5 based on a predetermined program. put. That is, as shown in FIG. 6, from the control device 5, the gantry traveling motor 34, the probe traversing motor 35 for the traversing block, the probe reversing motor 23, and the probe lifting cylinder 21 are controlled. Each drive circuit is configured to be able to issue an operation command signal, and each drive source transmits its operation to the tip holder 22 through the drive mechanism 7, thereby causing the probe 1 to perform a predetermined operation. It's starting to be given. The probe 1 is connected to a conventional ultrasonic transceiver device 8.

The operation of this device will be explained as follows. The control device 5 outputs pulse signals based on preset numerical values to the gantry traveling motor 34, the traverse motor 35, the reversing motor 23, the lifting cylinder 21, etc. according to a predetermined program, and the probe 1 The probe 1 is moved forward, backward, horizontally, reversed, and raised and lowered by giving a linked motion to each of the holding mechanisms, thereby drawing a rectangular zigzag trajectory as shown in FIG. In this case, the probe 1 traverses on the surface of the test material 6, and even when it reaches the side edge, it continues to move forward a little further and transfers onto the tab plate 42, where it is rotated and headed in the reverse direction. . While the probe 1 is transferred onto the tab plate and is turned over, the cylinder 21
The probe is raised and separated from the tab plate surface by the actuation of the probe. The above-mentioned reversing operation at the end of the traversing process is all performed on the tab plate on both the left and right sides, and the flaw detection operation continues until the moment it transfers to the tab plate, so the flaw detection of the material 6 to be inspected is sufficient up to the limit of the edge. It will be held in

According to the apparatus of the present invention, it is possible to fully automatically perform flaw detection on the entire surface of a steel billet, as well as quantitatively evaluate flaws, and furthermore, it is also possible to automatically output the flaw detection results for the next process. It is extremely effective for process control and greatly contributes to quality improvement.

[Brief explanation of the drawing]

FIG. 1 is a front view of the device of the present invention. FIG. 2 is a side view of FIG. 1 viewed from the negative direction. FIG. 3 is a side sectional view taken along the - line in FIG. 1. FIG. 4 is a side view of the guide plate device. FIG. 5 is a sectional view taken along the - line in FIG. 4. FIG. 6 is a block diagram showing the configuration of the control system in this device. FIG. 7 is an explanatory plan view of the surface to be tested showing the flaw detection trajectory by this device. 1: Tire probe, 2: Traverse block, 21:
Cylinder, 22: Holding part, 23: Reversing motor,
24: Gear mechanism, 3: Frame, 31: Support shaft, 3
2: Screw shaft, 33: Rail, 34: Frame traveling motor, 35: Traverse motor, 4: Guide stand device, 41:
Base, 42: Tab plate, 43: Reverse screw shaft, 44: Handle, 45: Control device, 6: Test material.

Claims (1)

[Claims] 1. In an ultrasonic automatic flaw detection device equipped with a tire probe that performs ultrasonic flaw detection by moving forward, backward, and traversing the flaw detection surface of a test material based on a predetermined regular rectangular trajectory, the tire detection a holding mechanism that holds the attachment part of the probe so that it can be raised and lowered and that holds the probe so that it can rotate, a control device that sets a predetermined program, and a control device that receives instructions from the control device and sets it based on the flaw detection trajectory. a cylinder device that causes an elevating section of the holding mechanism to move up and down according to timing; and a cylinder device that causes a rotating section of the holding mechanism to perform a predetermined rotation at a set timing based on a flaw detection trajectory in response to a command from a control section. Equipped with a drive device and a tab plate that is adjustable in width and height and is provided along the entire length of both edges in the width direction of the material to be tested so as to form the same plane as the flaw detection surface of the material to be tested. An automatic method for detecting flaws on the surface of a steel billet, comprising a guide stand device, which is capable of extending a running path up to a tab plate when traveling a tire probe in the width direction, and reversing the course on the tab plate. Ultrasonic flaw detection equipment.