SMALL-SIZE PRECISION BENT TUBE JOINT AND ASSEMBLY FOR REDUCING SUM TOTAL OF SPECIFIC ENVIRONMETAL LOAD, PROCESS FOR PRODUCING THE SMALL-SIZE PRECISION BENT TUBE JOINT AND ASSEMBLY, AND MOLD AND WORKING MACHINE FOR EXECUTION OF THE PROCESS

摘要

An object of the present invention is to provide a metal bent tube joint and assembly for use in pipe connection and a process for producing the metal bent tube joint and assembly and to reduce the sum total of a specific environmental load in the life cycle of the metal bent tube joint and the assembly by optimizing a mold and a working machine for the execution of the process. The bent tube joint is used in a pressure piping circuit for forcibly feeding a pressure fluid. Regarding the material for the bent tube joint, the bent tube joint having a hollow conduit is formed of a hard base metal material composed mainly of a metallic element which has a lower density than the sulfide mineral deposit-type metal and has a larger Clarke number or a larger recycle ratio as compared with the sulfide mineral deposit-type metal.