Mold molding method and its device |
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| 申请号 | JP4860679 | 申请日 | 1979-04-19 | 公开(公告)号 | JPS55141355A | 公开(公告)日 | 1980-11-05 |
| 申请人 | Sintokogio Ltd; | 发明人 | KANAYAMA RIYOUJI; | ||||
| 摘要 | PURPOSE:To obtain the mold having the required hardness readily and surely by subsequently increasing flow rate or pressure and blowing compressed gas stepwise in the case of blowing the same to the top surface of fillers. CONSTITUTION:When molding sand 41 for green sand mold is charged into the spacing formed by a pattern plate 5 and molding flask 7 and an on-off valve 19 is opened, compressed air produced from a compressed air source 20 is reduced of its flow rate by passing through a control valve 15 and is blown into the spacing 40. This compressed air spreads in the spacing 40 and is exhausted through vent plugs 6, 6, so that it is sustained in the state fairly lower than the set pressure for a certain while and circulates in the molding sand 41. This causes the molding sand 41 to be moved, resulting in its gradually increased resistance and pressure, hence highly densely packed molding sand 41. Thence, the compressed air is blown into the spacing 40 without being controlled of its flow rate, by which the molding sand 41 is pressed from its top and is thus packed evenly overall to a high density, whereby it is hardened to the required hardness. | ||||||
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| 说明书全文 | |||||||
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