Robotic Grit-Blast Surface Preparation System

The RB-10 robotic blast system is specially adapted for grit-blast surface preparation of gas turbine blades and buckets up to 1 m in length.

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Guyson Corporation’s new version of its RB-10 robotic blast system is specially adapted for grit-blast surface preparation of gas turbine blades and buckets up to 1 m in length.

The 60” × 60” finishing chamber of the robotic blasting system is designed with a heavily reinforced 60” × 48” vestibule at the rear to house an ABB Robotics IRB-2600 robot that directs a single pressure-blast nozzle. A 24” diameter turntable inside the blast enclosure is servomotor-driven and controlled as a seventh axis of robotic motion to enable precise orientation of the workpiece during the robotic grit-blasting process cycle, the company says. To facilitate handling of heavy components, the system is provided with a crane slot and a roof-mounted jib hoist of 500-lb weight capacity.

To meet the customer’s requirement that the surface profile produced by the robotic grit-blasting process be held within a tight tolerance of specific roughness values in preparation for plasma spray deposition of a thermal barrier coating, the media reclamation system was supplied with enhanced features. The transfer of blast media from the finishing enclosure to the reclaimer is accomplished by a mechanical conveyor positioned below the blast enclosure.

Used grit is delivered to the base of a bucket elevator with a cascade air wash separator at its top. Once dust and fines are extracted from the blasting grit, it passes through a vibratory screen classifier, and abrasive grain of the specified size is returned to a 10-ft3-capacity pressure pot.

An automatic media adder replenishes the grit supply from a storage hopper when electronic sensors detect a low media level.