Mitsubishi Steel Mfg. Co., Ltd.

Masakatsu Nishida

Itaru Tamura

Tsuyoki Kokubun

Akio Ishida

Koji Sassa

A production process of a wax pattern having a core, which is used for casting a product having a complicated hollow portion, comprising the steps of: producing two or more wax shells each having a contour of an external surface of a desired casting; and combining the wax shells with a core to obtain a wax pattern having a hollow portion between the wax shells and the core. Using the method, the occurrence of breakage of the core during dewaxing or production of the pwax pattern is extremely reduced, and a lowering in yield rate due to the breakage of the core is remarkably ameliorated.

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Utsunomiya, Japan

Masakatsu Nishida