Die-casting end-of-fill and drop forge viscometer flow transients examined with a coupled-motion numerical model

摘要

In a typical die-casting operation hydraulic injection pressure is set to give a desired shot profile. In reality, the plunger motion is affected by the buildup of pressure in the metal as it flows into the die, In this paper, the motion of the plunger is examined using a coupled-motion numerical model for the plunger and liquid metal. It is shown how the model can be used to study the end-of-fill metal impact transients responsible for flash when clamping force is insufficient. The numerical model for the coupled motion of rigid bodies and fluid is also used to examine an experimental approach to measuring the shear-rate-dependent viscosity of semi-solid metals, where a small A357 bullet is squeezed by a falling steel plate.