JEC COMPOSITES MAGAZINE - Issue #62 - January/February 2011 - 39

can be applied: - contact: in this case, the probe is mounted on a base equipped with a water couplant feed (and possibly recovery) system; - local immersion: coupling is carried out by a micro-nozzle that travels over the surface of the part being inspected at a constant distance and tilt with respect to the surface. - total immersion: the part is immersed in a tank and the probe is moved with a constant water column height. The robot’s level of protection against humidity varies as a function of the technique used (protection against sprinkling or immersion). These systems incorporate a single six-axis industrial robot.

Fig.7: Sysaxe® Dual - Synchronized Twin robots NDT Cell

the above-described requirements (figure 7).

Ultrasonic transmission NDT, synchronizing two robots
There are several techniques for automated ultrasonic transmission inspection. The simplest involves a fork with a squirter at the end of each branch. Since there is only one movement to be managed, only one robot is required. This method is suitable for simple-geometry parts (flat or rotational), but not for

complex geometries. For such parts, you have to use two robots that travel opposite each other. The axes of the ultrasonic beams on the transmitter and receiver probes must be secant and coaxial. The tolerable error for positioning, depending on the size of the robots used, is at the millimetre scale, and the coaxial tolerance should not exceed a few degrees. We made use of the possibilities of Sysaxe® technology for fast robot position data acquisition, among other things, to achieve synchronization in conformity with

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No62 January - February 2011 / jec composites magazine

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External axes

It is possible to add one or more external axes to increase the system’s capacity, whether the system has a single robot or two robots: - for rotational parts (cylindrical, elliptical, ovoid, etc.), a rotary table is added; - for extra-long parts, a linear axis is added.

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These systems are programmed and controlled in the same way as for single robots. This type of robotized system and its variants have applications in various industrial sectors: - aviation (composite or metal components), - sheet metal work in the nuclear, chemical and petrochemical industries, - shipbuilding, - iron and steel industry (ironworks, casting, etc.). n

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JEC COMPOSITES MAGAZINE - Issue #62 - January/February 2011

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #62 - January/February 2011