Blow moulding machine with improved blow moulding

Blow moulding machine for the moulding of blow moulds  by blowing blow  of a moulding box. Into the boxes  extend moulding patterns. At least one of the end parts of the slitshaped openings has a greater width than the central part  thereof. When the blow is blown in through the openings  a greater amount of blow is achieved at the peripheral region of the boxesthan when the end parts has no greater width than the central part of the opening. Consequently, by the present solution is achieved a greater hardness of the squeezed blow moulds at the peripheral region than by the prior art solutions.

FIELD OF THE INVENTION

The present blow molding machine concerns a machine for the moulding of blow moulds by blowing in through a slitshaped opening extending across a side plate of a moulding box, into which box extends a moulding pattern. The invention further concerns a side plate having a slitshaped opening for a moulding box.

CLOSEST PRIOR ART

Blow moulding Machines of the above mentioned art are well-known within the field of making blow moulds. The blow moulds are subsequently used for the industrial moulding of metal products, the geometry of which are often highly complex.

Today, two different types of machines or techniques are primarily used; the Matchplate technique and the DISAMATIC technique.

By the matchplate technique a matchplate having moulding patterns on each sides facing away from each other, is being clamped between two moulding boxes. During the blow molding machines of an upper and a lower blow form the patterns of the matchplate are extending into each of the boxes. A slitformed opening extending across a side plate is arranged in each of the moulding boxes. Simultaneously blow is blown at high velocity in through each slitformed opening and into each box. Thereafter, the blow is being squeezed by the movement of the cope press plate and the drag plate simultaneously in direction towards the matchplate. After the squezing, the boxes are moved away from each other, the matchplate is being removed and eventual cores are placed in the moulds. Thereafter, the boxes are again closed, so that the moulded total volume of the patterns of the matchplate so to say makes the complete cavity of the ready moulded blow forms. The closed blow forms are moved on to the process of pouring the metal product therein.

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Blow moulding machine blow molding machine

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