PROSPECTS OF MODERN CASTING METHODS FOR CASES WITH COMPLEX INTERNAL CAVITYстатья
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Дата последнего поиска статьи во внешних источниках: 23 декабря 2020 г.
Аннотация:Several methods of production of castings have been studied via the example of a case part, an axial piston pump back-end cover, namely. These methods include sand mold casting, casting into molds made of cold-hardening mixtures,permanent mold casting, lost-wax casting, lost-foam casting. We have considered only those casting methods, which ensure obtaining of internal cavities with curved axes without the use of coreboxes, inserts or any mechanic interference. The complex design and technological features of the cover made of gray cast iron show the advantages and dis-advantages of each of the casting methods. We have built 3D-models taking into account allowances, laps, roughness and accuracy of castings for each of the studied methods, i.e. sand mold casting, casting into molds made of cold hardening mixtures, permanent mold casting, lost-wax casting, lost foam casting [Baranov 2017, Domanski 2017, Elbakian 2018]. The examined casting methods have been compared in terms of the technological pro-cesses required, time needed to obtain a casting, staff qualification. The calculation of material utilization ratio has been carried out. As a result of research conducted, it was discovered that the optimum method of production of a casting with complex internal configuration is casting into molds made of cold-hardening mixtures. The research analysis has shown that this method requires the less time to preparation for casting production, than other methods. What is more, surface roughness and geometric specifications accuracy are also better than the ones, provided by other casting methods.