The development of lightweight and die casting technology for car body/chassis suspension key parts is one of the foremost research fields recently.To meet the requirements of own-brand car named "Trumpchi" belonging to Guangzhou Automobile Group（GAC）

die casting design for the rear sub-frame of the car chassis was performed.The results showed that the gating system and overflow/venting design based on Flow-3D simulation are reasonable

whose filling process is smooth.Good sealing effect can be improved by sealing design at parting surface

ejected pin

and shot pin.where vacuum degree can be reached up to 91kPa within 1s.Temperature-control precision can be improved effectively by adopting several thermocouples positioned temperature measuring in the die and individual adjustment of cooling water flow rate according to the mold temperature.Mass-volumetric production was made by the mold now.