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Keywords of this article:  injection molding 
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Servo C-axis.
Servo C-axis.

The Wittmann Group announced that new servo rotational axes are now available for its compact robots that range from the W821 to the W831 model.

These robots, designed for injection molding machines with clamping forces from 150-400 tons, enable payloads from 10-15kg.

When molding technical plastic parts with longer mold cooling times, injection molding automation systems – after having demolded the parts – can take advantage of this additional cycle time in order to execute downstream automation handling.

To offer more flexibility for these additional tasks, Wittmann has completely overworked the servo rotational axes for the W821 to W831 series. The standard models consist of three linear servo axes and a pneumatic swivel axis. The vertical axis realizes a stroke of 1,400mm with a maximum payload of 12kg.

In case, an additional servo rotational C-axis should be needed – maybe for the orientation of the parts gripper towards the part, using any angle – the maximum payload is nearly unchanged. Now that a servo rotational B-axis is added (rotating the gripper around the vertical axis) the payload is lowered slightly to 10kg.

Using these different combinations of axes – either a servo B-C-axis, or a servo B-axis combined with a pneumatic C-axis – any horizontal orientation of the parts can now be achieved. If necessary, these movements can be used in combination with additional palletizing actions.

Using a servo B-axis also offers further additional functionality, making it possible to determine from what mold half the parts should be removed – either from the moving half, or from the fixed half.

A special feature that these Wittmann robots offer is the unchanged movement profile of the axes (acceleration/deceleration), thus enabling a constant cycle time that is independent from the robots' configuration. As a result, the achievable cycle time is constant within a series. For the producer, this means that he gets accurate calculation of the costs per molded piece.

In addition to the servo rotational options, the robots of the series W821 to W831 can now handle a de-molding stroke of up to 800mm. The horizontal axis is available up to a length of 6,000mm.

More options are also available, for example: additional I/O-function, additional vacuum circuits and gripper circuits, RFID recognition for grippers, and so forth.

"Thanks to the continuous feedback from our customers and agents, Wittmann had started the development of servo rotational axes very early. Otherwise the actually possible increase in efficiency could not have been realized," stated Martin Stammhammer, Wittmann Group's International Sales Manager Robots and Automation Systems. "We are delighted to not only design and supply the most compact rotational modules in the market, but to also have increased the payloads of our robots."

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