Kazan National Research Technical University named after A. N. Tupolev — KAI, Kazan, Russia:

R. V. Gavariev, Senior Lecturer of a Chair “Design and Manufacturing Provision of Mechanical Engineering Productions”, e-mail: Gavarievr@mail.ru
I. A. Savin, Assistant Professor, Head of a Chair “Design and Manufacturing Provision of Mechanical Engineering Productions”

Nizhny Novgorod State Technical University, Nizhny Novgorod, Russia:

I. O. Leushin, Professor, Head of a Chair “Metallurgical Technologies and Equipment”

Nowadays, the special ways of casting take the leading place in the global production of mold precision casting. There are many special ways of casting all over the world but injection moulding is the most urgent and has many advantages including: largest production capacity; high quality of castings with complex configuration of outer surface and highest material ratio (to 99.5%). However in special cases, the castings producers have to meet the low quality indicators of the surface of the produced castings, which makes this method economically inefficient. The used method of improvement of castings quality is usually connected with expensive complex-alloyed steels with various ways of chemical and thermal treatment of mold details (nitriding is the less expensive one). This used method is widely applied for injection moulding of aluminium and copper alloys, but requires the alternative in case of usage of zinc alloys with much lower fusion temperatures. This paper solves the urgent problem of insufficient quality of zinc castings surface, obtained by injection moulding and laminated protective coatings on forming surfaces of molds by cathode-ion bombardment. We give the results of experimental investigations which are the basis of comparison of various types of coating alloys, looking at roughness of the surface of obtained coatings. We also give the equation for the forecasting of roughness of obtained castings depending on coating parameters.

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