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KraussMaffei Automation, the robotics division of the Münich-based supplier of plastics processing machinery, has introduced “synchronous motion”, allowing robots to synchronize with the ejector function of a molding machine and enter a mold while the platens are still in motion. KraussMaffei notes that in addition to speeding up the molding process, this also reduces the need for pneumatic systems.

KraussMaffei says that normally, a robot does not receive the enable signal until the mold is completely open. Using the “synchronous motion” function allows for earlier entry of the robot so that it arrives at the removal position during the opening movements of the machine.

Beyond keeping nonproductive time as short as possible, KraussMaffei notes that this technology can also make it possible to eliminate complicated gripper hardware. Ejector movement can be used for difficult-to-demold parts with the robot gripping the finished part during the demolding process as the ejector pushes the component onto the gripper. This requires a pneumatic system for the gripper during this “depressurize” step. If, however, the gripper moves along with the ejector, no pneumatic system is required. Depending on the complexity of the application, the synchronization can align with the clamp, part or ejector movement, allowing molders to define the degree of optimization.

KraussMaffei reports that synchronous motion enables demolding time to be reduced by approximately 35%. In the production of trash containers, for example, KraussMaffei says this reduction in demolding time equates to a 6% reduction in the total cycle time. In terms of impact on profitability, the company says the resulting boost in production can increase turnover up to 5% for pallets and up to 4% for crates.

KraussMaffei offers synchronous motion both for new machines and as retrofits for the MC6 controls on existing machines. It works with KraussMaffei’s LRX series linear robots and its IR industrial robots.