Ultrasonic testing of cylindrical blanks using copper casting ultrasonic flaw detector

NegotiableUpdate on 01/30

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Nature of the Manufacturer: Producers

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Overview

Ultrasonic testing of cylindrical blanks can be used in harsh factory environments and has high detection capability and speed. During the inspection process, the scanning trajectory of the blank is a spiral curve. When the blank rotates, the probe moves linearly along the axis of the blank, and the superposition of the two movements forms a spiral curve.

Product Details

　　Ultrasonic testing of cylindrical blanksThe key to the system is the coupling technology: the ultrasonic probe is separated from the surface of the workpiece by a certain distance, and the middle is filled with stable coupling water, which makes the probe almost free of wear and tear, and the adjustment time of the equipment is also very short when changing the diameter specification of the workpiece.

This technology, also known as jet technology, sets a water layer between the probe and the workpiece. The distance between the probe and the workpiece surface is several tens of millimeters (usually between 30mm and 70mm), which can greatly extend the service life of the probe. The probe used in this system is a liquid immersion probe, not a dual crystal probe.

Due to the need to replace the probe shoe due to changes in the diameter of the workpiece, it can greatly improve the detection efficiency and speed of the system. By using the distance amplitude correction curve (DAC curve), consistent detection sensitivity can be obtained for all defects at different depths.

Guide the probe shoe to move along the surface of the workpiece through a slider and/or roller mechanism, while maintaining a constant distance between the ultrasonic probe and the workpiece. To reduce the impact of workpiece flatness deviation on detection, a frame coupling is designed and installed on the probe holder, so that the probe base can accurately fit the surface of the workpiece, ensuring stable and reliable detection accuracy.

a) Only use a straight probe for detection. The inspected workpiece rotates and the probe holder moves in a straight line, achieving full coverage of ultrasonic testing.

b) Use an oblique probe to detect near surface defects in cylindrical blanks.

This can be achieved by tilting the straight probe at an angle relative to the surface of the workpiece. Considering the refractive law of the workpiece surface, a 45 ° refractive angle is usually used inside the workpiece. To detect near surface defects at different positions inside the workpiece, the system can be scanned by sound waves in both circumferential directions (clockwise and counterclockwise).

　　Ultrasonic testing of cylindrical blanksThe probe holder of the system can be arranged in two different ways: either all probes are installed in one probe holder, or the probes are evenly distributed throughout the length of the workpiece.

The selection of these two methods depends on the diameter of the workpiece, the condition of the workpiece end, and the flatness of the workpiece. If the end of the workpiece is neat, the diameter is relatively small, and the flatness is good, it is suitable to use a probe holder with multiple probes configuration. For aluminum castings with rough ends, the second configuration is required, which is to evenly distribute the probes along the entire length of the workpiece.

In this case, each probe covers a certain area of the workpiece, ultimately achieving the detection of the entire workpiece. Regardless of the above situation, in order to ensure full coverage of ultrasound, the detection trajectory must have overlap, that is, a certain coverage rate must be guaranteed.

For different detection requirements, different numbers of probes need to be used. Of course, the probe is a key factor in detecting machinery. If a special line focusing probe is used, it can improve the detection sensitivity and correspondingly increase the detection pitch.