Press seating joint face production on steel shaft

摘要

Preparing reusable longitudinal press seating joint faces, especially for railway wheel sets, involves subjecting the hardenable steel shafts to (a) formation of parallel solid phase laser hardened tracks with a martensitic structure in the direction of the longitudinal pressing force, i.e. axially along and on both sides of the shaft press seating joint face, so that the surface hardness is increased to several times that of the base material, and then (b) application of fine alpha brass particles, with 30-37% Zn content, as solid lubricant, so that the high frictional force of pressing on and off is borne by the very hard and finely structured material structure of the laser tracks and the adhesive force of the press seating joint is borne by the softer base material reliably without damage of the surfaces even after repeated joining operations.