Patent ID: 6555051
Filing Date: 2003-04-29
Classification: B22F

Abstract:
A method for manufacturing a sintered body comprising:an extrusion molding step of extruding a feed stock comprising a metal powder, a binder, and an organic material from an extrusion die including an injection side die and an extrusion side die, wherein said extrusion molding step comprises: compacting said feed stock in said injection side die; heating said feed stock during said compacting of said feed stock to a first temperature using a first heater located on said injection side die; heating said feed stock to a second temperature using a second heater located on said extrusion side die; ejecting said feed stock from said extrusion side die; and cooling said feed stock during said ejecting of said feed stock using a cooling unit located on said extrusion side die; wherein said extrusion molding step is performed with an extrusion die temperature lower than the melting point of said binder but higher than the melting point of said organic material in the vicinity of said extrusion opening wherein said extrusion die is also provided with a rapidly changeable temperature gradient along the extrusion direction so that a temperature of said extrusion die at said extrusion side die is lower than said injection side die; a debinding step of debinding the extruded body; and a sintering step of sintering the debound extruded body so as to manufacture the sintered body.