Guyson Corp.’s seven-axis, direct-pressure blast machine features a 30 × 40 × 30-inch work envelope and a small overall footprint for lean, cell-based component processing. A six-axis robot arm is mounted on a welded pedestal attached to the rear of the blasting cabinet that can manipulate the pressure-blast nozzle. A safety barrier with an interlocked access door surrounds the back of the machine to protect workers from the moving robot. Its 24-inch-diameter turntable is servomotor-driven and controlled as an auxiliary axis of robotic motion.
To isolate the robot from the potentially abrasive environment of the blast chamber, the rear wall opening in the blast enclosure is sealed by a custom-tailored skirt made from coated and laminated fabric, with a snug-fitting collar at the end of the arm. The side and front of the machine have side-hinged swing doors with safety interlocks for loading of parts, and to allow inspection and maintenance access.
In operation, the blast system is designed to maintain the correct blasting angle, stand-off distance and surface speed, even as it follows the contours of intricate-shaped components. This enables repeatable production of identical surface conditions from one area of the part to another, and from part to part.
When a variety of different components are to be processed in the machine, part-holding fixtures can be quickly interchanged, positively located and locked in position by using T-slots and guide pins in the rotary table. No other set-up or adjustment is normally required because specific component orientation is included in the coordinated motion program for each different part, and other blasting process parameters, such as blast duration and pressure, can be stored and automatically recalled at will.
The size and elaboration of the media reclamation and delivery elements of the robotic blast system depend on the requirements of the impact treatment application. The smallest pressure-blast module is less than 4 ft in height and is hung on the blasting cabinet itself. Technical surface preparation may require a 15-ft reclaim stack-up that includes a cyclone separator, a vibratory screen classifier and a pressure pot with the capacity to hold extra blast media.
To maintain negative pressure in the blasting enclosure and balance the air flow for media reclamation, the blast system features a reverse-pulsing, cartridge-type dust collector with an extraction capacity of 1,000 cfm of air.