Mold making method and device thereof |
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| 申请号 | JP13404978 | 申请日 | 1978-10-31 | 公开(公告)号 | JPS5561353A | 公开(公告)日 | 1980-05-09 |
| 申请人 | Hitachi Metals Ltd; | 发明人 | TAKEGAWA MASAZOU; ICHIKI MASATAKE; | ||||
| 摘要 | PURPOSE:To improve the moldability and parting characteristic of sand casting molds with extremely simple construction by applying negative pressure at the time of mold making and positive pressure at the time of parting to the vent hole to be buried in the concave part of the pattern forming a relatively deep pocket in the sand casting mold. CONSTITUTION:A vent hole 3 is buried in the concave part 2 of a patern 1 which forms a relatively deep pocket in the sand casting mold and a large-diameter pipe 6 which communicates at one end with this is provided on the back of a molding board 4. The large-diameter pipe 6 is inserted with a switch 7 at the other end and a small-diameter pipe 8 in its inside. First, at the time of making the mold by placing the mold on the molding board 4 and charging casting sand onto the pattern 1, the switch 7 is opened and pressure gas is fed through the pipe 8 in this direction, then the portions near the vent hole 3 of the pipe 6 assume negative pressure owing to ventury action. Hence, the casting sand is packed at high density in the concave part 2. next, at the time of parting the mold, the switch 7 is closed, then the pressure in the pipe 6 increases and the mold may be parted with eash without causing the breakage of the pocket formed in the concave part 2. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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