Improvements in the method of and apparatus for heating steel strips for the integral casting of metal alloys, particularly of copper bronze, onto said steel strips

摘要

859,684. Heating steel strip by electromagnetic induction. GLYCO-METALLWERKE DAELEN & LOOS G.m.b.H. May 19, 1959, No. 16940/59. Class 39(3). [Also in Group XXII] When casting meta: alloys, e.g. copper-bronze on to steel-strip for bearings &c., the steel-strip is pre-heatedto about 1100‹C by passing it through an inductively-heated gas-tight glow-muffle wherein it is heated by radiation-heat as well as inductively. The strip 1, pulled by a tractive device 13, is shaped by rolls 2 to the cross-section shown in Fig. 2, is preheated to about 700‹C. in an induction-furnace 3, heated to about 1100‹C. in the muffle 4, has copper-bronze cast-on from a crucible 9, is cooled at 10, straightened at 11, and milled to the required thickness by a milling-machine 12. The furnaces 3, 4, are kept under a neutral or reducing-gas atmosphere. The muffle 4 comprises a heatresistant non-magnetic body-portion 7, e.g. of a chrome and nickel alloy, firebricks 5 and a water-cooled induction-coil 6.