US 4,309,163 AGranted

Mould assembly for moulding elastomers

AssigneeSociete Lyonnaise de Ventilation Industrielle Solyvent-Ventec

InventorGerard Cottancin

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Abstract

This mould assembly for elastomers is of the type comprising a center block whose temperature is regulated. The block has means for injection of the elastomer into each mould cavity fed with elastomer by a nozzle of the injection device of the press. The center block has projections which are mounted on the block, or are part of the same material as the block, and project from two of opposite sides of the block. Small nozzles for directly injecting the elastomer into the mould cavities are detachably secured on the ends of the projections and adapted to cooperate with adjacent sections of at least two moulds in two or more sections which are disposed on the opposite sides of the center block. Means distinct from those of the block are provided for separately controlling the temperature of the projections and of the small nozzles. Means are provided for controlling the flow through the small nozzles. Means are provided for compensating for the expansion of the block and the moulds. The mould assembly further comprises a special nozzle for feeding elastomer to the block, the temperature of the special nozzle being controllable.

Claims13

Dependent claims

In a mould assembly for use with a press for the injection/compression moulding of elastomers and in particular for the moulding of high precision parts, the mould assembly comprising a centre block, first temperature regulating means in the block, elastomer injecting passage means in the block, at least one mould combined with a first side of the block and at least one second mould combined with a second side of the block opposed to said first side, each mould having a first mould section adjacent the block and a second mould section which is remote from the block and defines with the respective first mould section mould cavity means and a mould parting line, orifices in the first mould sections and communicating with said injecting passage means in the block and associated with the respective mould cavity means for feeding the mould cavity means with elastomer, and adjustable spacer means interposed between the first mould section and second mould section of each mould for adjusting spacing between each first section and second section in the course of the moulding operation;

the improvement comprising in combination first projections rigid with the block and extending from said first and second sides of the block, small nozzles respectively detachably mounted on the projections and engaging said first mould sections and putting said orifices in communication with said injecting passage means in the block, means combined with each small nozzle for controlling the flow of elastomer through the respective small nozzle, second temperature regulating means in said projections and third temperature regulating means in said nozzles, said first, second and third temperature regulating means being independent of one another and having separate ends for connection to separate temperature regulating sources, means for compensating for difference between the expansion of the block and the expansion of the two moulds, a second projection extending from said first side of the block and defining an inlet passage communicating with said injecting passage means in the block, a feed nozzle associated with said second projection for connection to an injecting element of said press so that the elastomer can be fed from said injecting element to said inlet passage, and fourth temperature regulating means combined with said feed nozzle associated with said second projection.

the improvement comprising in combination a plurality of projections extending from said first side of the block and a plurality of projections extending from said second side of the block, the projections being rigid with the block, small nozzles respectively detachably mounted on the projections and engaging said first mould sections and putting said orifices in communication with said injecting passage means in the block, valve means combined with each small nozzle for adjusting the flow of elastomer through the respective small nozzle, second temperature regulating means in said projections and third temperature regulating means in said nozzles, said first, second and third temperature regulating means being independent of one another and having separate ends for connection to separate temperature regulating means, an insulating plate interposed between the block and each first mould section, apertures in the insulating plates for the passage of the projections therethrough, recesses in each first mould section for respectively receiving the projections, each recess having a width larger than the width of the respective projection and small nozzle so as to allow lateral movement of the projections and small nozzles in their respective recesses, each recess having a flat end portion with which flat end portion the respective small nozzle is in laterally slidable engagement, said orifices being respectively provided in said flat end portions and the small nozzles each having an outlet orifice which is smaller than but coincident with the orifice in the respective flat end portion, a substantially central projection extending from and rigid with said first side of the block and defining an inlet passage communicating with said injecting passage means in the block, a feed nozzle associated with the central projection for connection to an injecting element of said press so that the elastomer can be fed from said injecting element to said inlet passage, and fourth temperature regulating means combined with said feed nozzle associated with said central projection nozzle.

Dependencies are inferred from the claim text.