Verfahren zur Herstellung eines Fluiddurchgangsformelements aus Kunstharz

摘要

In manufacture of a fluid passage forming member by heating and joining passage members formed of a thermoplastic synthetic resin, there is provided a method for forming the external configurations of the fluid passages and the fluid passage forming members to virtually predetermined configurations despite the heating.In this method, to join passage members 1a through 1c made of a thermoplastic synthetic resin, fluid passages formed by apertures 3 or grooves 4 in junction surfaces 2 between the passage members are formed by allowing expected shrinkage of the passages beforehand so that they are formed to have predetermined design sections by the shrinkage when heating and joining the passage members. The passage members are closely fitted in a forming mold 10, sealed in a state wherein the jointing surfaces to be joined with each other are pressed into contact, and heated and softened to join them. Deformation of the passage members in a direction orthogonal to the junction surfaces is restrained by the sealed forming mold, and a flow component of a material produced due to expansion of the passage members caused by heating of the passage members and contact pressing of the junction surfaces is absorbed mainly by shrinkage of the fluid passages.