Non-contact inspection of extruder bores

The housing-bore measurement device, idiamCONTROL, acquires the wear in the rear holes of extruder machines by measuring the internal diameter. An important criterion for the quality or the wear of tubes in industrial applications is the dimensional conformance of the internal diameter over the complete length. The measurement system, idiamCONTROL, carries out the measurement process inside the tube with very high accuracy, detecting possible points of wear extremely quickly. The integrated capacitive displacement sensors measure the actual bore diameter over the complete length of the process section. Through the additional acquisition of the axial sensor position with a cable-length measurement system, local deviations in diameter are found quickly and reliably. With the cable-length measurement system, each sensor position on the longitudinal axis of the hole is assigned a diameter. The result gives the diameter longitudinal profile in six tracks and an axial spatial resolution of 5 mm. The wear is calculated from the respective diameter values by the evaluation software. This enables accurate planning of the maintenance and replacement intervals of the individual housing parts without having to disassemble the processing section.

Data sheet idiamCONTROL (PDF 220 kB) Contact person

Diameter measuring in rear bores of extruders

Characteristics

Non-contact and wear-free measurement technique

Suitable for all metals without additional calibration

On-site evaluation

Exact, non-destructive inspection

Industrial, rugged mechanical construction

Application of a housing-bore measurement device

The measuring head is first introduced into one of the two rear bores and pushed using guide rods until it stops at the extruder gearbox. The diameter values and the distance passed are acquired and recorded during the return process. The signal is represented as the diameter over the complete length of the hole. Measurements beyond the tolerance limits are immediately displayed on the evaluation unit.

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