Patent ID: 8732948
Filing Date: 2014-05-27
Classification: B21K,B29C,B29L,F04D,F05D,Y10T

Abstract:
1. A method of manufacturing an impeller for a centrifugal blower comprising: preparing a blade-supporting rotator that is resinous to rotate around a rotational axis, the blade-supporting rotator having rotator weld parts including rotator weld surfaces formed on one side surface in the axial direction; disposing a plurality of resinous blades annularly around the axis, the plurality of resinous blades having hollow spaces formed in the blade interiors, the blades having blade weld parts on which are formed blade weld surfaces inclined with respect to the rotator weld surfaces in a state in which the blade weld parts are disposed to face the rotator weld surfaces in the axial direction; applying an axial pressure load to opposite axial ends of the blade-supporting rotator so as to compress the blades in the axial direction such that the blade weld surfaces are no longer inclined with respect to the rotator weld surfaces; and fixing the blade weld surfaces to the rotator weld surfaces by laser welding, the blade weld parts being disposed to face the rotator weld surfaces in the axial direction.