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    E-mail: info@china-castings.com

    Dongying Tousin Precision Metal Ltd

    183# Xi San Road
    People’s Republic of China
    Tel: +86-546-8181789
    Website: www.china-castings.com

    The current position: Home > Process

    Wax Pattern Making
    Wax replicas of the desired castings are produced by injection moulding using a metal die.

    Wax Pattern Assembly
    These patterns are attached via a “gate” to a central wax stick, referred to as a “tree” or “sprue”, to form a casting cluster or assembly, and mounted on a pouring cup.

    Shell Making
    A shell is built by immersing the assembly in a liquid ceramic slurry and then into a bed of extremely fine sand. Several layers may be applied in this manner.

    Once the ceramic is dry, the wax is melted out in an autoclave, creating a negative impression of the assembly within the shell. The shell mould is then fired in a high temperature oven.

    Melting &Pouring
    The shell is filled with molten metal using various techniques and, as the metal cools, the parts, gates, tree and pouring cup become a solid casting.

    Knock out & Cleaning
    When the metal has cooled and solidified, the ceramic shell is broken off by vibration or water blasting.

    The parts are cut away from the central tree using a high speed friction saw.

    Minor finishing operations, such as fettling and grinding, are undertaken to produce a metal casting identical to the original wax pattern.