美国专利US6467543本专利涉及的方法是利用对金属液施加压力,使金属液从铸件型腔底部沿反重力方向充型。充型过程由数字计算机控制,有感知元件测量充型压力、炉中液位和充型高度。充型开始时,型腔空间大,充型压力高,充型快,但须限制在不产 U.S. Patent No. 6,667,543 This patent relates to the method of applying pressure to molten metal to fill the molten metal from the bottom of the mold cavity in the anti-gravity direction. Filling process controlled by a digital computer, a sensing element to measure filling pressure, furnace level and filling height. Filling at the beginning, the cavity space, filling pressure, filling quick, but must be limited to not produce