Development of technology to restore the working area of the stamp tool

Abstract

Subject of research: technology for restoring the working area of a stamp tool, the structure and properties of the deposited layer of the restored stamp surface.
 Purpose of research: to develop a technology for restoring the working area of a hot deformation die insert for the formation of a gradient structure and properties of the metal over the cross section of the deposited zone.
 Methods and object of research: a technology for restoring the insertion of a worn hot-forming stamp on the beam of the front axle of a KAMAZ truck using two-layer electric arc surfacing with one type of electrode wire is presented. To obtain a gradient structure in the section of the working area of the die, heat treatment is proposed, which consists in tempering the die after the first surfacing at a temperature of 62010C, and after the second surfacing at a temperature of 52010C.
 Main results of research: it was found that after the restoration of the hot deformation die insert, the hardness of the deposited metal of the first (deep) layer was 3436 HRC, the structure was tempered troostite, the hardness of the second (outer) layer was 4246 НRC, structure tempered martensite and troostomare-tensite. This ensures high wear resistance of surface layers and crack resistance in the depth of the die metal.