Robots with New Servo Axes
Flexible Component Handling
Producing technical plastic parts may require long cooling times. Especially here, injection molding automation systems can use these additional cycle times after demolding to carry out downstream process steps. To allow for the highest possible degree of flexibility in handling additional tasks, Wittmann Kunststoffgeräte Ges.m.b.H., Vienna, Austria, completely re-designed the servo axes of rotation for the W821 to 831 series. These compact robots are designed for injection molding units with 1500 to 4000 kN clamping forces, offering 10 to 15 kg payload.
In their standard configurations, for example, the W821 and W831 models have three linear servo axes and a pneumatic swivel axis, with the vertical axis reaching a stroke of 1400 mm. Payload of this configuration is 12 kg. Should an additional C-servo swivel axis be necessary – for instance, to orientate the parts gripper towards the part in any desired angle – maximum payload will remain unchanged. Only if adding a B-servo rotation axis, which has the gripper rotate around the vertical axis, this will diminish payload to 10 kg.
Several different combinations of axes, e. g. B-C-servo or B-servo/C-pneu- matic, can also enable any desired horizontal orientation of parts, while the parts gripper is swiveled out. If required, this can be combined to palletizing. What is more, using a B-servo axis allows the user to define which side the moldings will be removed from, i. e. either from the moving or the fixed mold half.
According to Wittmann, one of the robots’ special features is the unchanged motion profile of the axes (acceleration/deceleration) and the constant cycle time entailed, independent of the robot’s equipment. The company says that, while the models from other manufacturers need to have their maximum motion profiles adjusted to the respective supplementary equipment, which reduces maximum acceleration and deceleration, this is not the case with Wittmann robots.
The W821 to W831 robots can perform 800 mm demolding stroke, and their horizontal axis is available up to 6000 mm length. If required, the user can choose from numerous options such as additional I/O function, vacuum and gripper circuits, several parallel conveyor cycles, and RFID gripper recognition.
Wittmann Kunststoffgeräte GmbH
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