FORMATION OF GROOVE OF FLUID BEARING

摘要

PURPOSE:To form easily grooves on the inside or outside surface of a fluid bearing with high accuracy by applying a temp. cycle which rises and falls with the transformation point in-between on the bearing consisting of a material having transformation and transferring the groove of a male die which does not cause transformation onto the bearing. CONSTITUTION:A bearing 3 contg. a grooving male die 2 which causes no deformation within a prescribed temp. and consisting of a material having transformation is fixed by means of segmental dies 4. The temp. cycle having a transformation start temp. Ts1, transformation end temp. Tf1, reverse transformation start temp. Ts2 and reverse transformation end temp. Tf2 is applied on the bearing 3 and load is exerted on the bearing 3 by a punch 1 under the transformation superplastic condition by which the bearing is molded. The punch 1 and the dies 4 are removed upon completion of the molding and the bearing is reheated to a temp. Th (