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Eddy Current , Ultr asonic and Flux Leakage inspection requires appropriate mechanics, controls and accessories to handle the test material and house the test sensors. MAC has designed a range of standard and custom handling systems that integrate mechanics with the test systems and production line to ensure the most accurate test results.
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| MECHANICS FOR MOUNTING TEST SENSORS |
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Coil Platforms for Eddy Current Systems
MAC has a range of coil platforms that support eddy current encircling and sector test coils designed for various applications, including cylindrical and shaped material, and magnetic and non-magnetic material. These platforms can handle test material sizes up to 235 mm (9.25") diameter for encircling test coils and up to 304.8 mm (12.0") diameter for sector (tangent) coils.
 Model 354 CP sector (tangent) test coil with saturation for testing magnetic material. |
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Model CP10, for encircling coil testing- Coil is shown in the foreground. |
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Rotary Mechanics for Eddy Current Systems
Where rotating eddy current probes are being used, they are housed in a rotary headplate, mounted in rotary mechanics that include a motor for spinning the headplate with its test probes around the material under test. Current rotaries feature continuously variable high speed rotaries (1800 - 6000 RPM), capable of handling test material up to 191 mm (7-1/2") diameter. |
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Rotary Mechanics for Ultrasonic Systems
MAC's Echomac® UT Rotary rotates ultrasonic transducers for shear-wave and compression-wave configuration at high throughput speeds. Standard models handle material from 6.3 mm to 220 mm (1/4" to 9") at test speeds up to 400 fpm, depending on the size and condition of the test material. |
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Rotary Mechanics for Flux Leakage Systems
Flux leakage test systems incorporate rotating test probes, mounted in a rotary headplate assembly. Current systems are available to handle up to 406 mm (16") diameter and 19 mm (3/4") wall thickness. Picture shows the headplate with test probe assemblies and magnetizing pole pieces for detecting longitudinal defects. Rotary mechanisms designed for detecting transverse defects are also available. |
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| TEST BENCHES & DRIVES |
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"V" Roll Test Benches
The various coil platforms and rotary mechanics described above can be mounted on a MAC test bench which aligns the test material with the test sensors. MAC's standard test bench utilizes 120 degree "V" rolls and pinch stands to support and position the test material. The fixed bottom "V" rolls, in conjunction with a flat top roll, provide 3 points of contact and ensure firm support for the test material, eliminating vibration that can cause false indications. Automated or manual controls adjust the pinch stand rolls to the size of the test material. Drive Mechanisms provide forward movement of the test material through the coil platforms and rotary mechanics where needed. Individual elevating platforms are usually included on the test bench for positioning larger rotary mechanics. 90 degree rolls are also available for square material. Auto diameter controls are available to automate adjustments of the testers and drives when the test material diameter is changed. |
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"V" Roll Pinch Stands
Automated or manual Pinch Stands help eliminate vibration that can interfere with the test, and ensure that the test material is properly positioned as it enters and leaves the test sensors. Pinch stands can be mounted on a test bench, or directly on a production line.
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| Drawing of "V" Roll Test Bench |
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Constant Center Triple Roll Bench for up to 125 mm diameter test material |
Constant Center Triple Benches
A constant center triple drive roll bench is another option for mounting the various mechanical components for MAC test systems. The bench eliminates vibrations from the test material that can cause false reject signals. A triple pinch is mounted between each test station on the bench. Each pinch, driven by a separate AC motor, uses three hardened steel rolls to center the test material. A frequency converter controls the AC motors to guarantee equal speed for all of the pinches. Slide mechanisms are available to allow access to test heads for off line setup and maintenance.
The entire bench can be adjusted up and down to align the test coils and heads w |
