| 摘要 |
1,017,658. Bearings. BOUND BROOK BEARING CORPORATION OF AMERICA. Sept. 30, 1964 [March 31, 1964], No. 39886/64. Heading F2A. In a method of treating oil-impregnated sintered bearings to render them noiseless, the bearings are immersed in a liquid medium of low viscosity, high volatility and low solvency, all with reference to the oil with which said bearings are impregnated, and are then subjected to the action of ultrasonic impulses to remove interstitial free particles of metal powder from which the bearings are formed. The medium is a petroleum aliphatic solvent having a Kauri Butanol value within the range of 25 to 50 and an A.S.T.M. distillation range of no more than 40‹ F., is continuously being filtered and may have an immersion temperature of 150‹ F. The ultrasonic impulses were within a range of 30,000 to 35,000 cycles per second for a period of three to five minutes. Filtering was by passing the solvent through a 10-micron filter, the bearings were dried by evaporating the solvent therefrom at ambient temperature, the drying time being from five to ten minutes. |
