BRASS FOR SYNCHRONISER RINGS AND METHOD FOR MANUFACTURING PREFORMS Russian patent published in 2021 - IPC C22C9/04 C22C1/03 C22F1/08 F16D23/02 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy and mechanical engineering and can be used for manufacturing complex alloyed brasses intended for manufacturing locking rings of synchronisers of mechanisms. A method for producing a preform of synchroniser rings from brass with a structure containing an α-phase in an amount of 14 to 32 % and silicides based on manganese, iron and chromium in an amount of 0.1 to 8.0 %, including melting an ingot in a semi-continuous casting unit, containing 59.0 to 60.0 wt.% of copper, lead no more than 0.2 wt.%, as well as zinc, manganese, aluminium, nickel, iron, titanium, zirconium, chromium, vanadium, cerium, tungsten, magnesium, cutting the ingot into blocks, producing semi-finished products in the form of pipes by pressing with pre-heating, cooling, removing extrusion defects from one end of the pipe, straightening on a cross-roll machine, cutting the other ends while removing pipe wall thickness variation, annealing and controlling the quality of the resulting preforms, wherein preliminary induction heating prior to pressing is conducted in the temperature range from 580°C up to 680°C followed by scalping, and annealing is executed at a temperature of 420°C up to 480°C for 3 hours, wherein the brass is melted from a charge consisting of no less than 30% copper and brass scrap and 60% waste of double- and complex-alloyed brasses.

EFFECT: invention is aimed at improving the quality of brass and increasing the manufacturability of preforms of synchroniser rings.

3 cl, 6 dwg, 3 tbl