Patent ID: 6979023
Filing Date: 2005-12-27
Classification: B22D

Abstract:
1. A die cast sub-frame for use in mounting a vehicle component to a vehicle body, the sub-frame comprising: a body portion; and a mounting portion adapted to be attached to the vehicle component, the mounting portion being provided on the body portion; the sub-frame being produced by a die casting process and a die casting machine having formed therein a gate, runners communicating with the gate, and a cavity communicating with a communication portion of the runner, the die casting process comprising the steps of: positioning the mounting portion in correspondence with the communication portion; flowing molten alloy through the runner into the cavity, wherein solidification occurs at the farthest portion of the alloy from the communication portion; applying pressure to the nearest part of the alloy to the communication portion, thereby compressing the nearest part into a dense cast structure having greater mechanical strength than the rest of the die cast sub-frame.