Method for manufacturing a variable capacity exhaust gas turbine

摘要

A manufacturing method for a variable capacity exhaust gas turbine whereby, a gap in a tongue section allowing exhaust gas to flow into an inner circumferential scroll section can be formed at a minimum, and a cover section near a ring can be mounted with high precision. In the method: exhaust gas turbine component members comprise a cover section and a reduced-diameter plate section extending the inner diameter side towards the shaft following the gap between a bearing housing and the turbine rotor; the cover section and the reduced-diameter plate section are integrally formed; a molded surface of the cover section is protruded to form a protrusion corresponding to the tongue section and formed in an intake equivalent portion of the inner circumferential scroll section of the cover section; and the protrusion undergoes cutting, and a cut surface and the tongue section are assembled maintaining the gap.