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Large mouldings come out of the machine warm, bulky and awkwardly placed. Removing them by hand means reaching deep between the tie bars, lifting from a bent posture and turning with the load – three movements, each problematic on its own.
After opening, the part has to be guided out of the mould area, set down and partly turned; for hybrid parts, inserts go into the mould. The removal position lies deep between the tie bars, the deposit outside the machine. The part is still warm and sensitive to deformation; pressure marks mean scrap. A removal robot would be tied to a program per mould – with frequent mould changes that is the more expensive route.
The path out of the mould area is not a straight line: first out, then around the tie bar, then to the deposit. That is exactly what a two-part articulated arm is built for – it folds and extends in the horizontal plane and reaches points a slewing jib only gets with a large radius. The load stays guided throughout: a warm moulding swinging on a rope will hit the tie bar sooner or later.
Mouldings are soft immediately after removal. A point gripper leaves marks that come back as scrap. We work with area pick-ups – vacuum on smooth sections, form shells along the contour – and limit the gripping force pneumatically. Where the geometry allows it, gripping from below on the sprue side is the gentlest solution.
The most common planning error in this task: the unit is in the way during the mould change. We place the standpoint so the crane can pass over the machine and the arm swings into a parking position – not dismantled, just turned away. With mobile base plates driving it aside works too, but every conversion costs time that is already scarce during a mould change.
The jointed arm for millimetre-precise handling.
View device Lifting equipment · Lifting axesCompact power for vertical lifting.
View device Lifting equipment · ManipulatorsThe jointed boom with a wide radius.
View deviceWhere the same mould runs for weeks, the robot is superior. With several mould changes a week it turns around: every new part needs a program, an approval and a gripper change. A hand-guided manipulator is ready on the day of the change without preparation.
For the pick-up 80 to 120 degrees is common and uncritical as long as pads or shells are designed for it – silicone instead of standard NBR. More critical than temperature is softness: the part deforms under point load, so area beats force.
Yes, and that is usually the more economical route. With a change system on the pick-up one unit serves both directions: insert in, moulding out. The precondition is that the cycle time allows the change – we calculate that in advance.
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