GB684013A - Hot deformation of metals - Google Patents

Abstract

684,013. Working metals. COMPTOIR INDUSTRIEL D'ETIRAGE ET PROFILAGE DE METAUX. March 8, 1951 [March 10, 1950], No. 5680/51. Class 83 (iv). Relates to the hot working of metals, particularly by drawing, extruding, flattening, flanging, rolling, and spinning, &c., and consists in the step of interposing a flexible sheet of lubricant between the heated work and the tool. The lubricant may be glass and this may be formed into fibres that may be woven, interlaced or otherwise intermingled with the addition of a binder if required. In a modification, the glass may be granulated and enveloped by or interposed in a felted fabric which itself may be a lubricant or in a flexible glass sheet as above. A flexible glass sheet may be prepared by coiling continuous fibres in a drum. The work is preferably heated by immersion in a salt bath, the coating of salt formed on the work aiding the glass sheet in adhering. Either the work or the tool may be covered by the sheet, e.g. by wrapping. For extrusion the heated billet is rolled on a sheet of glass cloth before introduction into the container and where tubes are to be extruded the mandrel is wrapped prior to introduction into a hollow billet. In forging, the die is covered by the sheet, the heated billet is superposed and covered by another sheet, and the operation is then carried out in the usual manner. Specifications 603,582, 607,285, 661,555 and 663,357 are referred to.