A multiple-gate runner system for gravity casting

摘要

The L-shaped junctions in running and gating systems used in aluminum gravitycasting have been investigated. Using computational modeling, a guideline forconstructing two geometries of L-junctions was developed. The sequential fillingprofile of liquid metal along L-junction was confirmed by real-time X-ray video ofan aluminum alloy sand casting. The change of flow direction through L-junctionscan yield a high coefficient of discharge Cd, without entrapping detrimentaloxide film defects because of the smooth flow, minimizing surface turbulence. Ashort "clear-up" time, the duration of filling a component, of L-shaped junctionis also achieved. For the necessary of future application of this junction, itsdimensionless equivalent lengths ( was to eliminate the trial and error approachas designing a multiple-gate system. From the guideline of L-junction, the twojunctions can be assembled into a complex multiple-gate runner system. In thisnovel design of multiple-gate system, uniform distribution of flow through eachgate into a mould cavity has been demonstrated. A high Cd value was alsopredicted.LE/D) and loss coefficient K were estimated. The m