Plastics Technology

SEP 2018

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Also reported in April was Yushin's addition of the OB-7 collaborative robot (or "cobot") to its line. Built by Productive Robotics in the U.S., the OB-7 uses a laser scanner to sense obstructions (such as presence of a person), which causes the robot to slow down and eventually stop— and then restart automatically when the person or other obstruction moves away. This feature allows the cobot to run six to eight times faster than other cobots that rely on low speed and torque to prevent accidental injury to a person. Another new development from Yushin is the CT2 or Clamp Traverse system with two robot arms on a single beam oriented along the axis of the machine instead of transverse. One arm interfaces with the mold and the other with downstream operations. Also running at Yushin's booth was a cell with two robots for demolding, stacking and bagging parts. The controller monitored the two head positions in 3D space to prevent collisions and also counted shots to regulate stacking and bagging. In the past year, Yushin launched Yushin University: online 24/7 free training with lessons and quizzes and a printable certifi- cate on completion of the course. At least 1800 customers have already signed up, Yushin says. A new feature being tested by Yushin's beta customers in Japan and not yet released in the U.S. is an EOAT Auto Design Tool. It uses CAD models of the mold or product; or the user can draw the part, as well as provide the layout and spacing. Part geometry can also be simulated by simple shapes. The user chooses from a library of 50 templates of EOAT and designates where to place the suction cups. Then the system designs the full EOAT, including the wrist plate, along with a bill of materials, all dimensions, and the weight. Yushin hopes to offer this on its website in the near future. Yudo of South Korea (U.S. office in Livonia, Mich.; showed off several new developments, including the Zema 508 ultra- high-speed linear robot with active anti-vibration control, up to 350° rotation, and 5 kg payload capacity (up to 25 kg for other models in the Zema series). It was shown with Yu-Eye vision system for mold and part inspection. Also new from Yudo is a collaborative robot with six or seven axes, which can stand on a stationary pedestal or ride on a track (Track Motion system). It can be used for machine tending with part removal and QC checks (vision capability optional). It reportedly is being used by Samsung for production of washing-machine components. while delivering eight finished inserts to the robot for removal and placement in eight stacking tubes. • Large, complex automotive molding cell with 17 inserts: A Sepro 6X-90L six-axis robot successively picked and loaded three types of inserts from three vibratory feeders, positioning each into one side of a two-sided stage assembly. An S7-75 linear robot picked the staged inserts, plus a single large insert, and loaded them into one side of the mold and removed a finished part from the other mold half and placed it on an exit conveyor. As reported in July's NPE Close-Up, Yushin America ( operated a highly complex cell of its own at NPE, just to show off the multiple capabilities of its robots. The cell involved two injection presses, two linear robots, a seven- axis collaborative robot, IML, pad printing, two threaded parts (unscrewed from the mold and then screwed together by the robots' servo wrists), closing of a hinged closure, and printed cards inserted into the product before assembly. As reported in April, Yushin debuted its FRA servo linear robot line. Among its new features is arc motion control—multi-axis motions that yield a smooth-arc travel path instead of right-angled corners, which can cut robot cycle times substantially—from 16 sec to 12 sec in the demonstration at the show. Also new is a three-axis servo wrist for the FRA series that is 50% slimmer than previous models. All FRA robots also have built-in cellular communications capa- bility for production data reporting to the Cloud. This Intu Line feature was demonstrated by a display of data from several Yushin robots in different booths at the show, as well as in Japan. One-minute automated mold change demon- strated live at NPE. Staubli demonstrated one-minute automated mold change, using a mold preheating station (far right) and rail-guided mold cart (center). Six-axis robot (left) executed automatic change of EOAT coordinated with the new mold. 20 SEPTEMBER 2018 Plastics Technology N P E R E P O R T: R O B O T S Close -Up On Technolog y

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