Method for producing antifriction layer of a plain bearing

Abstract

The invention relates to foundry engineering, more specifically to producing an antifriction layer of a plain bearing by casting babbitt into a bearing shell or backing and is applicable to the manufacture and renewal of plain bearings. The invention is aimed at improving the quality of a plain bearing antifriction layer. A method for producing an antifriction layer of a plain bearing including: casting babbitt into a bearing shell or backing and forcedly cooling the babbitt at a speed providing structural uniformity of the antifriction layer, mainly by cooling babbitt on the cast-in layer side, characterized in that said casting of babbitt into a bearing shell or backing produces a semifinished antifriction layer which is subjected to plastic deformation by means of a punch under superplasticity conditions to produce an antifriction layer, the bearing shell or backing being used as a die.

1 . A method of producing an antifriction layer of a plain bearing, including: casting babbitt into a bearing shell or backing and then forcedly cooling the babbitt at a speed providing structural homogeneity of the antifriction layer, mainly by cooling on the side of the cast-in layer, characterized in that said casting of babbitt into a shell or backing produces a semifinished antifriction layer which is subjected. to plastic deformation by means of a punch under superplasticity conditions to produce an antifriction layer, wherein the bearing shell or backing being used as a die. 
   
   
       2 . The method according to  claim 1 , wherein said deformation of the semifinished layer is performed to a deformation degree of between 25% and 45%. 
   
   
       3 . The method according to  claim 1 , wherein after said casting of babbitt the molten metal is redistributed by means of a punch to produce a semifinished antifriction layer. 
   
   
       4 . The method according to  claim 3 , wherein said casting of the molten metal is performed into a heated shell or backing, and said cooling is performed on the side of the cast-in layer by means of a punch having a temperature of no more than 100° C. 
   
   
       5 . The method according to  claim 4 , wherein said punch has room temperature. 
   
   
       6 . The method according to  claim 1 , wherein said casting of babbitt is performed into a shell or backing, or in an attachment shaped in accordance with the backing or shell. 
   
   
       7 . The method according to  claim 6 , wherein said casting of babbitt is performed into a heated attachment, and said redistribution and cooling of the molten metal is performed on the side of the cast-in layer by means of a punch having a temperature of no more than 100° C. 
   
   
       8 . The method according to  claim 7 , wherein said punch has room temperature. 
   
   
       9 . The method according to  claim 7 , wherein said casting of babbitt is performed into an attachment having room temperature, and the molten metal is redistributed by means of a heated punch. 
   
   
       10 . The method according to any one of  claim 1 ,  4 ,  7  or  9 , wherein a deformation temperature is at least t n , where t n  is the minimum temperature at which work plasticity of the babbitt layer is preserved having regard to the β-phase grain size obtained at the cooling step. 
   
   
       11 . The method according to  claim 10 , wherein a deformation temperature is close or equal to t n , and after the deformation a recrystallization annealing is performed by heating the bearing to a temperature of between 100° C. and 150° C. and holding at that temperature for 0.5-1.0 hour. 
   
   
       12 . The method according to  claim 1 , wherein a deformation speed is in the range from 10 −5  s −1  to 10 −2  s −1 , the higher the deformation temperature, the greater may be the speed selected within said range.