| 摘要 |
A container of a superplastic alloy material is manufactured by causing a fluid to blow into a bottomed cylinder. Prior to the blow molding, the cylinder has its surfaces finished smooth and is preheated in a temperature range of 200 DEG - 300 DEG C at least two minutes. Within a metal mold, the cylinder is subjected to an initial pressure of at least 8 atm., and is thereafter subjected to a molding pressure in the range of 7 - 20 atm. into the container blown out to the final dimensions. Since the molding pressure is lastly bestowed after somewhat inflating the cylinder by the initial pressure, the product is blowmolded finely, and a beautiful container having neither a flaw nor a crack on the surface is obtained. |
