Evaporative-pattern casting

Abstract: Casting is a manufacturing route that is of fundamental importance in the processing of metals because of its ability to produce complex shapes cheaply. A recent development, the Evaporative Pattern Casting (EPC) process, holds the promise of revolutionizing the manufacture of castings, making the process even more economically attractive. One serious limitation of this process is blow holes in the castings. The blow holes and/or gas porosity in EPC castings is because of the non-escape of the gas produced as a result of burning of polystyrene pattern in the sand mold. The hybrid-casting process is developed to improve the quality of castings. The developed hybrid-casting process has been termed as Vacuum-Assisted Evaporative Pattern Casting (VAEPC) process. This aricle investigates the effect of process parameters like degree of vacuum, pouring temperature, grain fineness number, amplitude of vibration, and time of vibration on the solidification time of Al-7%Si alloy castings. In order to evaluate the e...

Abstract: The invention provides a method for preparing a ceramic particle enhanced steel-base composite material cast by an evaporative pattern casting die. The method comprises the following steps of: uniformly mixing hard ceramic particles and aged foam beads according to any proportion, and filling the mixture into a curing die cavity of the die for curing to manufacture a foam die in which enhancement bodies are uniformly distributed; and then shaping according to the conventional evaporative pattern casting method, putting the obtained foam die into the cavity, smelting a base metal material to pouring temperature, pouring the base metal material into the cavity, cooling and solidifying the base metal material at room temperature, and clearing sand away from the base metal material to obtain the ceramic particle enhanced steel-base composite material, of which the hard ceramic particles are dispersed in the base metal. The preparation method is easy to operate, high in whole performance and high in yield rate; furthermore, in spite of whole enhancement and partial enhancement, various metal-base composite material parts can be directly made without secondary processing; the method is suitable for large-scale industrial production, and can be widely applied to anti-abrasion fields, such as mines, power, metallurgy, coals, building materials and the like.