| 摘要 |
<p>A method and a machine for the moulding of sand moulds. The machine has upper and lower moulding boxes (6, 7) and a telescopic down sprue assembly (11) arranged in the upper moulding box (6). A matchplate (19) with moulding pattern is clamped between upper and lower moulding boxes (6, 7), whereafter the down sprue assembly (11) is activated with pressurised air, so that a telescopic extendable part (18) is forced on to contact with the matchplate (19). The pressurised air is de-activated before the matchplate (19) is removed so that the end (18) of the down sprue (11) remains in position without any sudden movements which severely could damage the upper sand mould (4). The invention also relates to a holding plate for the sprue assembly.</p> |
