Showing papers on "Roller burnishing published in 1992"
Patent•
30 Oct 1992
TL;DR: In this article, the authors proposed a method to increase the hardness of a burnishing worked surface, preventing the generation of so-called plucking-off, by using a coolant agent to lighten the abrasion of a ball.
Abstract: PURPOSE:To increase the hardness of a burnishing worked surface, preventing the generation of so-called plucking-off. CONSTITUTION:Coolant feeding holes 10 and 11 are formed on a mandrel 9, and a coolant groove 13 which communicates to the coolant feeding holes 10 and 11 is formed on the inner surface of one holding member 8, and a ball holding part is formed by the opening in the coolant groove. Accordingly, the abrasion of a ball 12 is lightened by the lubrication by a coolant agent, and further the high pressure coolant is supplied intermittently into each coolant groove 13 by the repetitive communication and cut-off between the coolant feeding holes 10 and 11 and the coolant groove 13, by the deflection revolution due to the revolution difference between the mandrel 9 and the holding member 8 through the ball 12. The ball 12 is applied with an impact force by the pressure of the coolant agent, and burnishing work can be carried out by tapping the worked surface by the ball 12, and the high peening effect can be obtained.
5 citations
Patent•
09 Jul 1992
TL;DR: In this article, the main journal part and a pin journal part in a cast crank shaft are subjected to high-frequency heating and are thereafter cooled to reduce the ant. of ferrite precipitated around spheroidal graphite dotted in the structure and to regulate the hardness of the above parts to the range of 300 to 450 in Vickers hardness.
Abstract: PURPOSE:To uniformize the film thickness between a bearing metal and journal parts in a crank shaft and to improve its seizing resistance 9y subjecting a main journal part and a pin journal part in a crank shaft to high-frequency heating, executing cooling to regulated its hardness to a specified one and thereafter subjecting it to roller burnishing. CONSTITUTION:A main journal part 1a and a pin journal part 1b in a cast crank shaft 1 are subjected to high-frequency heating and are thereafter cooled to reduce the ant. of ferrite precipitated around spheroidal graphite dotted in the structure and to regulate the hardness of the above parts to the range of 300 to 450 in Vickers hardness. This journal parts 1a and 1b are subjected to roller burnishing by rollers 6 and 7 of a stationary jig 9 and a roller 8 of a movable jig 11 to increase the hardness of their surfaces and furthermore to smoothen the surfaces. In this way, the film thickness between a bearing metal and the journal parts 1a and 1b is uniformized to improve its seizing resistance.
4 citations
Patent•
10 Jan 1992
TL;DR: In this article, the foot of a terminal is surfaced by machining and/or roller burnishing, in order to remove the traces of parting lines (junction planes) resulting from the method of manufacture.
Abstract: The method of manufacture consists in surfacing the foot (9) of the terminal by machining and/or roller burnishing, in order to remove the traces of parting lines (junction planes) resulting from the method of manufacture. The external frustoconical part (7) and the internal orifice (5) are shaped, before machining, by a punching (closed-die forging) or stamping operation carried out on a terminal blank obtained by casting under gravity, the dimensions of which are close to the final dimensions.