Robotic Automation
Universal Robotics national sales manager. “The global safety specifications that are being developed by ISO are also adopt- ing the word ‘collaborative,’ so based on the written standard, through force sensing and a risk assessment, the use of a collaborative robot unguarded can be implemented.” The latest ISO 10218-1 and 10218-2 standards for robotic safety is being adopted by the RIA R15.06 ANSI safety stan- dard as well, Mullen added. “With the proper risk assessment, our robot can be implemented in a manufacturing environ- ment and be able to run unguarded because of some of the features that we have implemented in our technology, specifi- cally our force sensing,” he said. “We can actually sense force up and beyond what the robot is using to operate, recognize there is a potential collision and be able to safely stop the robot and not generate a damaging impact force.” The system does this through a combination of hardware sensor technology and the company’s software algorithms. “It knows the required torque of all the motors. If it sees
The “Gakushu” Learning Robot from Fanuc Robotics was ini- tially developed for spot-welding and assembly applications.
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something up and beyond that value, it recognizes that as a potential collision and will do what we call a Force Stop,” Mullen said. “It’s a combination of looking at encoder positioning in each of the joints, as well as current into the motors of each of the joints, and through our own propri- etary algorithms we’re able to make some decisions based on some deltas in each of those and recognize that as a collision.” The six-axis UR5 and UR10 robots feature relatively light payloads of 11 lb (5 kg) and 22 lb (10 kg) respectively. Aimed primarily at small to medium- sized manufacturers, Universal’s robots are highly flexible, allowing easy move- ment for redeployment in a factory for new applications, and are very simple to program, with operators teaching the robot the path desired by moving it to multiple points that it learns. To date, the company has installed more than 50 robots in the US, Mullen said. “Our market is the cadence-driven, repetitive tasks that are being done manually now,” Mullen added, “so it’s for putting products in bins on a conveyor, gluing, cutting, welding, painting, machine tool tending, loading/ unloading parts, things like that, where we’ve got really great accuracy specifi- cations and speed specifications, to be able to achieve the throughput with one arm. Our speed specs are 1 m/sec, and repeatability is ±0.004" [±0.1 mm].”
5/1/13
Photo courtesy Fanuc Robotics
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