Patent ID: 6525289
Filing Date: 2003-02-25
Classification: B23K,B23P,F16F

Abstract:
Method of manufacturing a piston for magneto-rheological fluid systems, comprising the steps of providing a piston ring made of a material having a relatively high magnetic permeability and a piston plate made of a material having a low magnetic permeability, said ring having an inner circumferential surface defining an inner diameter of said ring, said ring terminating in an end face, said plate having an interfering portion larger than the inner diameter of said ring whereby said interfering portion of the plate engages said end face when the plate is urged against said end face, forcing the plate against the end face of the ring while causing an electrical current to flow through the plate sufficient to heat the interfering portion of the plate engaging the end face to a temperature below the melting point of either material but sufficient to soften the interfering portion of the plate to permit the plate to be forced inside of the ring, forcing the plate into the ring, and removing said current.