Accession Number : AD0674155

Title :   EXTRUSION OF TOOL STEEL WITHOUT PRESS RESIDUES (VYDAVLIVANIE INTRUMENTALNOI STALI BEZ PRESSOSTATKA),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Severdenko,V. P. ; Muras,V. S. ; Sukhodrev,E. Sh.

Report Date : 08 SEP 1967

Pagination or Media Count : 10

Abstract : A method of butt-free hot extrusion of solid and hollow shapes from structural and high-alloy tool steels is described. The principle of this method is as follows: an intermediate link or 'insert' is placed in between the punch and the forging; the height of the insert is not lower than that of the die. The material of this insert must withstand considerable loads without a change in its properties, its strength should be lower than the strength of the extruded metal and it should display the qualities of a lubricant. So far, of the materials investigated for this purpose, the best results were displayed by a graphite-clay-silica mixture subjected to thermal or chemical hardening after its molding remains of the carbon electrodes of electric arc furnaces also are suitable. This development not only assures a successful butt-free hot extrusion but also displays other positive aspects. Thus, early during the extrusion part of the 'insert' flows into the gap between the punch and the container and, throughout the distance traveled by the punch, provides a uniform layer of lubricant, which completely precludes jamming of the punch. Toward the end of the extrusion the material passes through the die and disintegrates into powder, which facilitates its removal for re-use. This technique also improves the conditions for automating the process of hot extrusion.

Descriptors :   (*TOOL STEEL, *EXTRUSION), HOT WORKING, LUBRICANTS, SOLIDS, DIES, FORGING, USSR

Subject Categories : Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE