Aluminum motorcycle left-cover has the features of uniform wall-thickness and large profile dimension. Parting surface was designed in terms of the shape

dimension of the parts and requirements of gating system and die-released. Center-spreading gating system was adopted

and ingate was designed at thick location of the parts

which is helpful to transferring pressure and to filling and feeding of liquid aluminum alloy. Meanwhile

an over-flow exhausting system is set at the position where is a blind corner or is directly impacted by liquid aluminum alloy to ensure smoothly filling

which is beneficial to exhausting gas and waste-liquid alloy. Push-bar was homogeneously set at the thick position of parts to ensure uniform push-pressure to avoid the deformation of the parts.