Process and device for producing moulded parts from plastic
OwnerFranz Josef Summererinventor
Life of this patent
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Abstract
Process and device for producing moulded parts from plastic In a process for producing, in particular, optical moulded parts from plastic, a first mould plate (1′) is moved in the direction of the second mould plate (2′) until the mould plates (1′, 2′) make contact at stop faces (9, 10). Subsequently, the first mould plate (1′) approaches the second mould plate (2′) through a tilting movement. In this case, plastic is injected into the cavity (15) which is formed between the first mould plate (1′) and a second mould plate (2′). Shortly before termination of the clamping movement, the two mould plates are caused to be released from one another in the region of the stop faces (9, 10). The two mould plates are then clamped in parallel.
Claims15
Process for producing moulded parts from plastic by means of a device having a first and a second mould plate, having the following process steps:
- clamping the device in such a way that the first mould plate (1′) is moved in the direction of the second mould plate (2′) until the mould plates (1′, 2′) make contact at stop faces (9, 10);
- further clamping the device in such a way that the first mould plate (1′) approaches the second mould plate (2′) through a tilting movement;
- injecting plastic into the cavity (15) which is formed between the first mould plate (1′) and the second mould plate (2′) before and/or during the tilting movement;
- causing the two mould plates to be released from one another in the region of the stop faces (9, 10) shortly before termination of the clamping movement;
- and
- parallel clamping of the two mould plates.
Process according to one of the preceding claims, characterized in that after the release of the mould plates (1′, 2′) the first mould plate (1′) is shifted in the direction away from the second mould plate (2′) in a defined movement which is determined by virtue of the fact that an axis of rotation of the first mould plate (1′) is mounted in an axial guide (18) displaceably in the normal direction to the second mould plate (2′) and at the same time rotatably.
Process according to one of the preceding claims, characterized in that the transition from the tilted position of the first mould plates (1′, 2′) into the parallel position of the mould plates (1′, 2′) is carried out by means of targeted control of a force compressing the two mould plates (1′, 2′), or of the injection pressure accompanied by mould breathing.
Process according to one of the preceding claims, characterized in that no plastic is pressed back into the cavity (15) during parallel clamping of the mould plates (1′, 2′).
Process according to one of the preceding claims, characterized in that the moulded part is an optical moulded part.
Process according to one of the preceding claims, characterized in that the moulded part is a multi-component mould part which has a surface material, in particular film or fabric, onto which the moulded part is moulded.
Device for producing moulded parts from plastic, which has:
- a first mould plate (1′) mounted rotatably about an axis of rotation, and a second mould plate (2′), which are tilted relative to one another in an open state and make contact with one another at stop faces (9, 10),
- an axial guide (18) in which the axis of rotation of the first mould plate (1′) is mounted rotatably and at the same time guided displaceably in the normal direction to the second form plate (2′),
- means for exerting a force (6) which, in the event of a clamping movement for which the first mould plate is tilted in the direction of the second mould plate (1′, 2′), holds the two mould plates together at the stop faces (9, 10), and
- a control means which causes two mould plates (1′, 2′) to be released from one another shortly before termination of the clamping movement in the region of the stop faces (9, 10).
Dependencies are inferred from the claim text.