Manufacturing method for nozzle vane

Abstract

A method of fabricating a nozzle vane comprising a vane portion and axle portions that project out from predetermined end faces of the vane portion, the method including: a first process that molds the axle portions by inserting pre-molding axle portions of a fabricated member having a pre-molding vane portion and pre-molding axle portions with dimensions respectively approximating the vane portion and the axle portions in axle portion molding dies in which a first insertion portion is formed with a shape that projects the axle portions in the axial direction, and pressing the pre-molding axle portions in the axial direction; and a second process that molds the vane portion by inserting the fabricated member after the first process in a vane portion molding die in which a second insertion portion is formed with a shape that projects the nozzle vane in a direction that is approximately perpendicular to the vane surface of the vane portion, and pressing the pre-molding vane portion in directions approximately perpendicular to the vane surface.

1 . A method of manufacturing a nozzle vane comprising a vane portion and an axle portions that project out from a predetermined end faces of the vane portion, the method comprising:
 a first process that molds the axle portions by inserting a pre-molding axle portions of a fabricated member having a pre-molding vane portion and a pre-molding axle portions with dimensions respectively approximating the vane portion and the axle portions in axle portion molding dies in which a first insertion portion is formed with a shape that projects the axle portions in the axial direction, and pressing the pre-molding axle portions in the axial direction; and   a second process that molds the vane portion by inserting the fabricated member after the first process in a vane portion molding die in which a second insertion portion is formed with a shape that projects the nozzle vane in a direction that is approximately perpendicular to the vane surface of the vane portion, and pressing the pre-molding vane portion in directions approximately perpendicular to the vane surface.   
     
     
         2 . The method of manufacturing a nozzle vane according to  claim 1 , wherein
 each axle portion of the nozzle vane projects out on the same axis in opposite directions from both end faces of the vane portion; and   in the first process, molding a pair of the axle portions by respectively inserting a pair of the pre-molding axle portions in a pair of the axle portion molding dies, and pressing the pair of pre-molding axle portions in the axial direction.   
     
     
         3 . The method of manufacturing a nozzle vane according to  claim 1 , wherein the axle portions that are molded in the first process are inserted without gaps in a third concave portion and a fourth concave portion that are formed in the vane portion molding die. 
     
     
         4 . The method of manufacturing a nozzle vane according to claim  1 , wherein when pressing the pre-molding axle portions in the axial direction, a pair of pushers capable of moving in the axial direction are used, and when pressing the pre-molding vane portion in directions approximately perpendicular to the vane surface, a pair of pushers capable of moving in directions approximately perpendicular to the vane surface are used. 
     
     
         5 . The method of manufacturing a nozzle vane according to  claim 1 , wherein when pressing the pre-molding axle portions in the axial direction, with one end side of the pre-molding axle portions fixed to the axle portion molding die in the axial direction, a pusher that is capable of moving in the axial direction is pressed on the other end side of the pre-molding axle portions that is not fixed in the axial direction, and when pressing the pre-molding vane portion in a direction approximately perpendicular to the vane surface, with one end side of the pre-molding vane portion fixed to the vane portion molding die in a direction approximately perpendicular to the vane surface, a pusher that is capable of moving in a direction that is approximately perpendicular to the vane surface is pressed on the pre-molding vane portion of the other end side that is not fixed in a direction that is approximately perpendicular to the vane surface. 
     
     
         6 . The method of manufacturing a nozzle vane according to  claim 2 , wherein the axle portions that are molded in the first process are inserted without gaps in a third concave portion and a fourth concave portion that are formed in the vane portion molding die. 
     
     
         7 . The method of manufacturing a nozzle vane according to  claim 2 , wherein when pressing the pre-molding axle portions in the axial direction, a pair of pushers capable of moving in the axial direction are used, and when pressing the pre-molding vane portion in directions approximately perpendicular to the vane surface, a pair of pushers capable of moving in directions approximately perpendicular to the vane surface are used. 
     
     
         8 . The method of manufacturing a nozzle vane according to  claim 2 , wherein when pressing the pre-molding axle portions in the axial direction, with one end side of the pre-molding axle portions fixed to the axle portion molding die in the axial direction, a pusher that is capable of moving in the axial direction is pressed on the other end side of the pre-molding axle portions that is not fixed in the axial direction, and when pressing the pre-molding vane portion in a direction approximately perpendicular to the vane surface, with one end side of the pre-molding vane portion fixed to the vane portion molding die in a direction approximately perpendicular to the vane surface, a pusher that is capable of moving in a direction that is approximately perpendicular to the vane surface is pressed on the pre-molding vane portion of the other end side that is not fixed in a direction that is approximately perpendicular to the vane surface.