GUYSON CORPORATION designed a robotic blast machine that precisely repeats programmed surface preparation routines on individual components and automatically processes a tray-full of parts without interruption. The Model RB-600 uses a 6-axis Fanuc LR Mate 200iC robot as a component manipulator. Mounted upside down on an engineered structure, under the roof of the grit-blasting chamber, the articulated arm is fitted with a pneumatically actuated gripper and a tailored suit of laminated fabric that isolates the robot from the harsh abrasive environment of the process enclosure.
Like components in a production lot are placed in a custom-designed tray or pallet that precisely orients the parts for robotic picking. The tray of components is placed on the transfer cart at one end of the robotic blast system, and a bar code is scanned to identify the part number to be processed and automatically call up the associated robot motion program and blast process parameters.
The transfer cart shuttles in and out of the blast chamber at the end of each blast cycle, so a finished component can be returned to the tray and an unblasted part can be picked up by the component-handling robot. To ensure accurate positioning, the motion of the cart is servomotor driven and controlled as a seventh axis of robotic motion.
Inside the blast finishing cabinet, a single pressure-blast nozzle is rigidly bracketed in position within easy reach for the robot to hold the component in the blast stream at the correct angle and distance to the nozzle, turn and move the part at the right surface speed for thorough surface preparation and efficiently follow the programmed tool path to ensure complete coverage without over-blasting.
A second gripper is installed on the inside of the cabinet wall to temporarily hold the component and enable the robot to re-grip the part and obtain 100 percent coverage by blasting those areas masked by the first grip.
Robotic motion programs and blast processing recipes for more than 50 different components can be stored and recalled instantaneously. No set-up time or adjustments are required to change from one part number to another, and trays of components can be processed in any sequence, so long as the scanned identifier for each tray matches with an existing program file.
The blast machine manufacturer claims that a single, lightly attended, robotic grit-blast system of this type equals the throughput of four manually operated blast cabinets, with energy savings of 70% from reduced compressed air consumption and a dramatic improvement in the consistency of finish around all areas of a single component and from one component to another.
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