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Abstract:
Creep of foundry sand was observed at investigation on the influence
of the duration of acting time of the compacting force on compaction of
foundry sand. It was observed also, that the duration of force acting
has significient influence on some important mould-forming properties,
such as springback, pattern withdrawing force and reloading deformation
etc. The mechanism of these mould-forming properties are analysed with
theological principle or with considering the viske-elastic and viske-plastic
behaviour of the bentonite-film between sand grains. Further the
difference of the traditional high pressure squeezing and the newly
developed air impulse compacting of foundry sand in compacting effect
was discussed with above mentioned hypothesis. It follows that, it is
necessary to consider the rhological behaviour of bentonite-film in
research with high speed process of compacting foundry sand, such as air
impulse compacting.
Key words:
铸造 型砂 紧实 蠕变
中国科学院科学基金资助项目. Received 198907,
received in revised form 198912
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