| 摘要 |
PURPOSE:To produce a pipe bend having an intricate shape with good accuracy and high efficiency by disposing a core formed by embedding a reinforcing core material consisting of a flexible continuous body into a consumable material into a casting mold, pouring a forming material into the mold and curing the same. CONSTITUTION:The core 12 consisting of inactive aggregate such as sand and the consumable material such as fused salt, low melting alloy or synthetic resin which is softened or dissolved by water, heat, chemical, etc. and can be thus removed is disposed into the casting mold 13 consisting of a cope 13a and a drag 13b. The prescribed forming material is poured into the cavity 14 of said mold. The reinforcing core material 15 which connects plural core members 16 by spherical joints to constitute a flexible shaft and forms end faces 16a, 16b developing in the direction intersecting with the axial direction of the core 12 between the respective core member 16 is embedded into said core 12. The mold 13 is opened upon curing of said forming material, then the formed product is taken out and the consumable material of the core 12 is consumed by means such as heating or dissolving and thereafter the material 15 is drawn out and the pipe bend having the curved part is obtd. |
