Pressure vessel, compressor and process for casting cylinder block

Abstract

A pressure vessel of the present invention is such that at least part thereof comprises a metallic composite materialcomprising alight metal, which is turned into a matrix, and a plateshaped iron-basedmember, which is buried in the light metal, whose major component is iron, and which is provided with a large number of through holes penetrating the front and rear surfaces. By means of this construction, it is possible to provide a pressure vessel having a novel construction whose pressure resistance is enhanced without being accompanied by thickening, and a compressor being provided with a housing comprising the pressure vessel. Moreover, a casting process of the present invention is a casting process, which is suitable for producing cylinder blocks, and is characterized in that, in a casting moldbeing provided with hollow portions () forming a molding cavity surface, and a pouring passagewhich is communicated with the hollow portions, a substantially cylindrical iron-based memberhaving cut-offsat the opened end portions is allocated so that the opened end portions are brought into contact with the molding cavity surfaceand spacesare provided on the front- and rear-surface sides of the iron-based member, and a light-metal molten metal' is filled into the entire hollow portions through the pouring passagevia the cut-offs, thereby casting the light metalaround the iron-based-member