Method for the production of a molding
OwnerRoland Saur-Broschinventor
Life of this patent
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Abstract
The invention relates to a method for producing a moulded piece (compression moulding, moulded body) using a compression moulding device. The use of special construction features for the compression moulding device, such as a spring-loaded punch, an intermediate punch and clamps, allows the advantageous production of moulded pieces.
Claims18
A method for the production of a molding with a core using a compression molding apparatus comprising an upper punch and a lower punch which are arranged in the vertical direction of a die, characterized
- in that the molding device comprises an intermediate punch, and in that it comprises a device, with which the intermediate punch can be positioned between the upper punch and the die and be removed from this position.
A method according to any one of the preceding claims, characterized in that
- the lower punch has an at least two-part structure, comprising an inner punch and an outer punch, the outer punch surrounding the outer periphery of the inner punch, wherein both the inner punch and the outer punch can perform both shifting movements and compression steps.
A method according to any one of the preceding claims, characterized in that the sequence of the method comprises:
- A supply step 1 of the outer layer, with which molding material for a first part of an outer layer is supplied into a recess above the lower inner punch, which is enclosed by the lower outer punch;
- a core supply step, in which the molding material for the core is supplied into a recess above the molding material for the first outer layer, which has been supplied in the preceding step, and enclosed by the lower outer punch;
- a pressing step of the outer layer and the core, in which the molding material for the first outer layer and the molding material for the core supplied in the preceding steps, are compression-molded;
- a supply step 2 of the outer layer, in which a molding material for a second part of the outer layer is supplied into a recess of a die above and/or around the first outer layer and the core, which have been formed in the preceding step,
- a complete pressing step, in which the first outer layer, the core and the molding material for the second outer layer, which has been supplied in the previous step are compression-molded;
- and
- a step of removing the compression-molded molding, which is carried out after the complete pressing step,
- and wherein at least during one pressing step, an intermediate punch is positioned between the upper punch and the die.
A method according to any one of the preceding claims, characterized in that with the pressing steps of the first outer layer and the core the intermediate punch is moved downwards by the upper punch.
A method according to any one of the preceding claims, characterized in that the intermediate punch is positioned between the upper punch and the die over a partial circle of the circular path of the upper punches.
A method according to any one of the preceding claims, characterized in that one or more intermediate punches are mounted in a fixture that is arranged rotatable around an axis which is parallel to the main axis of the molding device.
A method according to any one of the preceding claims, characterized in that the mounting of the intermediate punch is fixed to the die table, the upper punch guide, the lower punch guide or a part of the compression molding apparatus which is moving synchronously with those.
A compression molding device comprising an upper punch and a lower punch which are arranged in the vertical direction of a die, characterized
- in that the compression molding apparatus comprises an intermediate punch, and a device with which the intermediate punch can be positioned between the upper punch and the die.
A method or compression molding device according to any one of the preceding claims, characterized in that the compression molding device comprises a die or a die insert with a tubular insert, the tubular insert being vertically shiftable with respect to the die or the die insert.
Dependencies are inferred from the claim text.