Apparatus for fixing blades on turbine wheel for fluid coupling made of

Abstract

Proposed in this specification is a method for fixing a multitude of blades or vanes onto inner concaved surface of an outer shell of a turbine wheel for a fluid or hydrodynamic coupling made by sheet metal stamping, in which a plurality of slots, each having a size sufficient to receive in it a projected part of each blade, are formed by means of an array of punches held on a die in the inner concaved surface of the outer shell of the turbine wheel at an equal space interval provided between adjacent slots, and in an arrangement of a plurality of concentric rings, then the projections provided on each blade are fitted into the slots in a manner to cause the blade to extend in the radial direction from the center of the concentric rings of the arrays of the slots, and finally one of the edge portion of each slot is staked or caulked by means of the array of punches which have been shifted for a thickness of the blade so as to cause one of the side surfaces of each of the projections on each blade to be urged to the inner surface of the slot opposite to the staked inner surface thereof. Also proposed is an apparatus for fixing such blades which is constructed with a die to hold the outer shell of the turbine wheel with its inner peripheral surface being faced upward, and at least a single ring shaped punch array consisting of a plurality of punches, which are provided on the die in a vertically movable manner.