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NDT Talk

By Bill Buschur -
General Manager

Last year was a record year for ibg. Given the nature of the economy, this year will certainly not be so robust, but we should still have a good year overall. The fundamental need for eddy current component testing has not lessened. We shall see what 2009 brings..

I have just returned from an international sales meeting for ibg inBamberg, Germany, at which the new eddyvisor®SC was formally introduced. More information on this instrument will be forthcoming in future issues of the TEST Patterns newsletter.

This issue of TEST Patterns focuses on a few of the many turnkey systems designed and built by ibg.

However, did you know that a significant share of our instrument sales in North America is to third party machine builders and integrators?

We would be pleased to talk with you and any of your capable machine builders and integrators about their integration of ibg eddy current instruments.

ibg instruments are designed for easy integration, and we support third party integrators with our technical knowledge.

Bill Buchur

Crack detection on gas bottle threads is automatic with eddyvisor®C and eddyscan®F

Longitudinal cracks in the threads of gas bottles (at the bottle necks) are detected by an ibg developed system utilizing using two proven surface-scanning technologies: eddyvisor®C and eddyscan®F.

Here’s how it works: A high-pressure vessel (a gas cylinder) is tested for cracks on the inner thread of the cylinder neck. Integrated into a production line, the rotating head, eddyscan®F, is inserted into the neck of the clamped cylinder via a centering device, testing the critical zones of the thread for surface-open cracks as it is withdrawn.

After testing, good bottles are forwarded to the next production step, while the bad bottles are sorted out. The entire system is designed to be fully automatic, and it is equipped with an automatic master part run. Cycle time for each cylinder is 25 sec. Longitudinal cracks to a depth of 0.5 mm are detected.

Semi-automatic testing of forged and cast parts identifies material mix-ups

In this system, an operator places a part by hand on to a conveyor belt, which moves with constant speed, transporting the part to be tested through the test coil. An optical sensor triggers measurement according to the Preventive Multi-Frequency Test (PMFT) protocol. This test is primarily to verify use of the correct alloy.

If the tested part registers as “good,” it falls into the OK parts container at the end of the conveyor belt. If it is a bad part (NG), the belt stops and the operator takes it off. However, automatic sorting mechanism may be installed with this system as an option.


Stamped parts are automatically tested for correct heat treatment

This ibg system tests to verify the proper heat treatment of stamped rocker arms for small engines.

The procedure is as follows: The parts are fed via a vibration feeder to the escapement of the test system, where each part is individually pushed into the test coil. There, testing occurs according to the Preventive Multi-Frequency Testing (PMFT) method for correct heat treatment. Then, depending on the test result , the part is sorted—either to good (OK) parts or to bad (NG) parts discharge chutes. Cycle time for the system is less than 4.5 seconds per part.

Deep drawn sleeves tested automatically for surface open defects and for use of wrong alloy using new eddyvisor®SC instrument

This system consists of a parts feeding and separation station, a station for testing for material mix-up, a station for crack detection and a sorting station.

An encircling coil lowers over the sleeve for testing in the material test station. Then, the sleeve is cycled to the crack detection station, where it is rotated, while four crack test probes scan the criticalareas for surface-open defects.

After the material mix text and crack detection, the part is cycled to the sorting station, where it is discharged into either an OK or NG chute. Two chutes are used for the “bad” parts, separating those with cracks from those made from the wrong material alloy. Cycle time is about 1.5 sec. per sleeve.

NOTE : Proper functioning of this automatic test system is verified by means of regular or selected intervals using an automatic master part run.

Development of new crack probes

ibg engineers continually face new application challenges. The two newly developed crack detection probes described here represent two solutions.

Multi-differential crack detection probe

This probe is particularly effective for detection of cracks and pores In cast iron cylinder liners, especially when distinct groves are present.

Spheric X-type crack detection probe

This probe is particularly effective on components with changing surfaces: e.g. cylindrical, conical and planar. The probe is held at a 45° angle (see drawing) to the surface and can scan all the changing surfaces without loss of resolution to cracks and pores.