ダイカスト金型内のガス圧解析と鋳造への応用 Analysis of Gas Pressure in Die Cavity and Its Application to Die Casting
Reducing the trapped gas quantity is important in die casting. In this study, first, the analytical formula to calculate the gas quantity in a die cavity during injection was derived and experimentally confirmed. Secondly, the effective casting conditions for reducing the gas quantity were calculated by using the formula. Casting techniques to reduce the gas quantity were mainly in such factors as low speed injection, longer stroke of low speed injection, and delaying time of blocking up the air vent by molten metal. In the case of conventional high speed die castings, most of the gas initially retained in a cavity was found to remain. This was due to an inappropiate air vent design which did not have a suitable dimension corresponding with the metal charging rate. Concerning the method of reduction of remaining gas, it was concluded that was low speed charging process was necessary if small air vent was inevitable, or was big air vent must be adopted if high speed injection was needed.
- 鋳造工学 = Journal of Japan Foundry Engineering Society
鋳造工学 = Journal of Japan Foundry Engineering Society 68(6), 499-505, 1996-06