Method for collecting iron-based powder and method for manufacturing sintered body

Abstract

A method for collecting an iron-based powder includes the steps of; preparing a raw material powder containing a first metal powder containing 90% by mass or more of iron; forming a green compact by subjecting the raw material powder to uniaxial pressing using a die; machining the green compact; and collecting a second metal powder having an average particle diameter of 50 μm or more and 500 μm or less from machining chips generated in the step of machining.

What is claimed is: 
     
         1 . A method for collecting an iron-based powder, the method comprising the steps of;
 preparing a raw material powder containing a first metal powder containing 90% by mass or more of iron;   forming a green compact by subjecting the raw material powder to uniaxial pressing using a die;   machining the green compact; and   collecting a second metal powder having an average particle diameter of 50 μm or more and 500 μm or less from machining chips generated in the step of machining.   
     
     
         2 . The method for collecting an iron-based powder according to  claim 1 , wherein the uniaxial pressing is performed at a pressure of 1000 MPa or higher. 
     
     
         3 . The method for collecting an iron-based powder according to  claim 1 , wherein the uniaxial pressing is performed at a pressure of 1500 MPa or higher. 
     
     
         4 . The method for collecting an iron-based powder according to  claim 1 , wherein, the step of machining is performed using a cutting method. 
     
     
         5 . The method for collecting an iron-based powder according to  claim 1 , wherein the first metal powder has an average particle diameter of 20 μm or more and 200 μm or less. 
     
     
         6 . The method for collecting an iron-based powder according to  claim 1 , wherein, in the step of collecting the second metal powder from the machining chips, a metal powder having an average particle diameter of 50 μm or more and 400 μm or less is collected from the machining chips. 
     
     
         7 . The method for collecting an iron-based powder according to  claim 1 , wherein, in the step of collecting the second metal powder from the machining chips, a metal powder having an average particle diameter different from the average particle diameter of the first metal powder is collected. 
     
     
         8 . The method for collecting an iron-based powder according to  claim 1 , wherein, in the step of collecting the second metal powder from the machining chips, a metal powder having an average particle diameter larger than the average particle diameter of the first metal powder is collected. 
     
     
         9 . A method for manufacturing a sintered body, the method comprising the steps of:
 preparing a raw material powder containing a metal powder containing 90% by mass or more of iron;   forming a first green compact by subjecting the raw material powder to uniaxial pressing using a die;   machining the first green compact to obtain a machined compact; and   sintering the machined compact to obtain a sintered body,   wherein the raw material powder contains a regenerated metal powder containing 90% by mass or more of iron collected from machining chips generated when a second green compact different from the first green compact is machined.   
     
     
         10 . The method for manufacturing a sintered body according to  claim 9 , wherein the uniaxial pressing is performed at a pressure of 1000 MPa or higher. 
     
     
         11 . The method for manufacturing a sintered body according to  claim 9 , wherein the uniaxial pressing is performed at a pressure of 1500 MPa or higher. 
     
     
         12 . The method for manufacturing a sintered body according to  claim 9 , wherein the raw material powder contains 5% by mass or more and 30% by mass or less of the regenerated metal powder collected from the machining chips generated when the second green compact is machined. 
     
     
         13 . The method for manufacturing a sintered body according to  claim 9 , wherein the raw material powder contains 5% by mass or more and 50% by mass or less of the regenerated metal powder collected from the machining chips generated when the second green compact is machined. 
     
     
         14 . The method for manufacturing a sintered body according to  claim 9 , wherein the raw material powder contains 5% by mass or more and 70% by mass or less of the regenerated metal powder collected from the machining chips generated when the second green compact is machined. 
     
     
         15 . The method for manufacturing a sintered body according to  claim 9 , wherein the step of machining is performed using a cutting method. 
     
     
         16 . The method for manufacturing a sintered body according to  claim 9 , wherein the metal powder contained in the raw material powder and containing 90% by mass or more of iron has an average particle diameter of 20 μm or more and 200 μm or less, and the regenerated metal powder contained in the raw material powder has an average particle diameter of 50 μm or more and 500 μm or less. 
     
     
         17 . The method for manufacturing a sintered body according to  claim 9 , wherein the regenerated metal powder has an average particle diameter different from the average particle diameter of the metal powder. 
     
     
         18 . The method for manufacturing a sintered body according to  claim 9 , wherein the regenerated metal powder has an average particle diameter larger than the average particle diameter of the metal powder.