Lubricating oil for rolling and rolling method

Abstract

The present invention provides a lubricating oil for rolling, which contains a mineral oil and/or a synthetic oil as the main component and has a friction coefficient of 0.2 or more, and a rolling method using the lubricating oil for rolling.

1 . A lubricating oil, comprising at least one of a mineral oil and a synthetic oil as the main component, wherein the lubricating oil has a friction coefficient of 0.2 or more. 
     
     
         2 . The lubricating oil according to  claim 1 , wherein the lubricating oil has a friction coefficient of from 0.2 to 0.4. 
     
     
         3 . The lubricating oil according to  claim 1 , wherein the lubricating oil has a kinematic viscosity at 40° C. of from 2 to 15 mm 2 /s. 
     
     
         4 . The lubricating oil according to  claim 1 , further comprising a friction coefficient improver. 
     
     
         5 . The lubricating oil according to  claim 1 , wherein the lubricating oil is adapted to lubricate threading, gear cutting, grooving, or burnishing. 
     
     
         6 . The lubricating oil according to  claim 1 , wherein the lubricating oil is adapted to lubricate worm rolling. 
     
     
         7 . A rolling method, comprising contacting a rolling tool with the lubricating oil of  claim 1 , and performing a rolling process with the rolling tool. 
     
     
         8 . The rolling method according to  claim 7 , wherein the rolling process is worm rolling. 
     
     
         9 . The worm rolling method according to  claim 8 , wherein the rolling process is performed such that a die push-in speed is from 0.02 to 8 m/s, a die rotation speed is from 5 to 550 rpm, and a die peripheral speed is from 0.04 to 3.14 m/s. 
     
     
         10 . The lubricating oil of  claim 1 , wherein the lubricating oil is adapted to lubricate a rolling process. 
     
     
         11 . The lubricating oil according to  claim 2 , wherein the lubricating oil has a kinematic viscosity at 40° C. of from 2 to 15 mm 2 /s. 
     
     
         12 . The lubricating oil according to  claim 2 , further comprising a friction coefficient improver. 
     
     
         13 . The lubricating oil according to  claim 3 , further comprising a friction coefficient improver. 
     
     
         14 . A rolling method, comprising contacting a rolling tool with the lubricating oil of  claim 2 , and performing a rolling process with the rolling tool. 
     
     
         15 . The rolling method according to  claim 14 , wherein the rolling. process is worm rolling.