Apparatus to actuate injection element
AssigneeBattenfeld GmbH
InventorsReinhard Gruber, Harald Bleier, Martin Ganz
Life of this patent
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Abstract
An apparatus to actuate an injection element (1) for injecting a defined quantity of plasticized plastic or the like into an injection molding tool. The injection element (1) is designed as a piston or as a screw and is guided in a guide (2) and moved by an actuation element. The actuation element (3) has a tappet (4), which is guided on a crank plate (5), the crank plate (5) being turned with positional accuracy by a controlled or regulated servomotor (6). The invention provides that, for the return stroke of the injection element (1), a second tappet (7) is present, which is actuated by a second crank plate (8).
Claims13
An apparatus to actuate an injection element for pushing a defined quantity of material into an injection molding tool, the injection element comprising a piston or a screw that is guided and moved by an actuation element, the actuation element having a tappet, which is guided on a crank plate, the crank plate being turned with positional accuracy by a servomotor, the crank plate having a camming surface that causes an injection motion during which the injection element moves quickly to inject the material into the injection molding tool, the camming surface being shaped to thereafter cause the injection element to move more slowly as the camming surface continues to rotate to create a hold pressure on the material, the crank plate rotating 360° during an injection molding cycle.
A plastic melt injection process, comprising:
- introducing a quantity of plastic into a cylinder of an injection element;
- pushing the plastic from the cylinder into the injection molding tool with a stroke of the injection element;
- and
- modulating the stroke of the injection element by rotating a crank plate having a camming surface that engages a tappet that is connected to the injection element, the camming surface causing an injection motion during which the injection element moves quickly to inject the plastic into the injection molding tool, the camming surface being shaped to thereafter cause the injection element to move more slowly as the canming surface continues to rotate to create a hold pressure on the plastic, the crank plate rotating 360° during the injection process.
Dependencies are inferred from the claim text.