Method for manufacturing a porous oil-impregnated revolving shaft assembly

Abstract

A method for manufacturing a porous oil-impregnated revolving shaft assembly includes following steps: 1) offering an amount of metal powder, a particle diameter of the metal powder ranging from 1 μm to 150 μm; 2) offering a mold cavity and filling the metal powder in the mold cavity to form a green piece, a plurality of pores being defined between the metal powder of the green piece; 3) heating the green piece at a high temperature to sinter the metal powder to obtain a sintered product, a volume ratio of pores of the sintered product ranging from 12% and 20%; 4) dipping the sintered product into oil to make the oil enter the pores of the sintered product to thereby obtain a final desired product for forming the porous oil-impregnated revolving shaft assembly.

1 . A method for manufacturing a porous oil-impregnated revolving shaft assembly comprising the steps of:
 1) offering a plurality of metal powder, a particle diameter of the metal powder ranging from 1 μm to 150 μm;   2) offering a mold cavity and filling the metal powder in the mold cavity to form a green piece, wherein a plurality of pores is defined between the metal powder of the green piece;   3) heating the green piece at a high temperature to sinter the metal powder to obtain a sintered product, wherein a volume ratio of pores of the sintered product ranges from 12% and 20%;   4) dipping the sintered product in oil to make the oil enter the pores of the sintered product to thereby obtain a final desired product.   
     
     
         2 . The method for manufacturing a porous oil-impregnated revolving shaft assembly as in  claim 1 , wherein the metal powder comprises an amount of fine metal powder and an amount of super fine metal powder, a particle diameter of the fine metal powder ranging from 10 μm to 150 μm. 
     
     
         3 . The method for manufacturing a porous oil-impregnated revolving shaft assembly as in  claim 2 , wherein the particle diameter of the fine metal powder ranges from 50 μm to 80 μm. 
     
     
         4 . The method for manufacturing a porous oil-impregnated revolving shaft assembly as in  claim 2 , wherein a particle diameter of the super fine metal powder ranges from 1 μm to 10 μm. 
     
     
         5 . The method for manufacturing a porous oil-impregnated revolving shaft assembly as in  claim 2 , wherein the super fine metal powder accounts for 1%˜10% of a weight of the fine metal powder. 
     
     
         6 . The method for manufacturing a porous oil-impregnated revolving shaft assembly as in  claim 3 , wherein the metal powder received in the mold cavity is pressed to make the green piece, a volume ratio of pores of the green piece situated between 30% and 50%. 
     
     
         7 . The method for manufacturing a porous oil-impregnated revolving shaft assembly as in  claim 6 , wherein the volume ratio of the pores of the green piece is situated at 35%. 
     
     
         8 . The method for manufacturing a porous oil-impregnated revolving shaft assembly as in  claim 1 , wherein a particle diameter of the metal powder ranges from 1 μm to 20 μm. 
     
     
         9 . The method for manufacturing a porous oil-impregnated revolving shaft assembly as in  claim 8 , wherein the particle diameter of the metal powder ranges from 5 μm to 20 μm. 
     
     
         10 . The method for manufacturing a porous oil-impregnated revolving shaft assembly as in  claim 9 , wherein a bonding agent mixes with the metal powder to make a mixture and the mixture is injected into the mold cavity to obtain the green piece.