Method for improving optional performances of large H13 steel hot-extrusion mould

Abstract

The invention relates to the field of aluminum alloy hot-extrusion moulds and in particular relates to a method for improving optional performances of a large H13 steel hot-extrusion mould. The method is characterized by comprising transverse fiber flow-direction forging, normalizing and spheroidizing annealing after the forging in the forging process, wherein the method specifically comprises the following steps of: (1) filling the blanks to a furnace and heating up the blanks to 1180 DEG C to 1200 DEG C; (2) axially forging the blanks and continuously forging the blanks in a radial direction, wherein the peripheral direction of the mould blanks is the fiber flow direction, and the forging ratio is not smaller than 4; and (3) carrying out the normalizing and the spheroidizing annealing after the forging. Compared with the prior art, the method has the beneficial effects that the fiber flow direction on the center part of the mould is distributed in the peripheral direction by virtue of the transverse fiber flow-direction forging process, so that the tissue of the mould is uniform and compact; moreover, the thermal treatment process of the normalizing and spheroidizing annealing after the forging is adopted, so that the netlike carbide can be removed and the crystal-phase tissue structure is improved, and therefore, the service life of the mould is prolonged twice or more.

Description

Technical field [0001] The invention relates to the deep processing technology of aluminum, magnesium, and titanium light alloy materials and the production technology and process fields of high-performance metal materials, in particular to a large-scale H13 steel hot extrusion die used for industrial aluminum profile hot extrusion machines above 50MN Use performance methods. Background technique [0002] H13 hot work die steel is the main material of the hot extrusion die used in the hot extrusion molding process of aluminum profiles. At present, the domestic mainly adopts the axial forging process to make the hot extrusion die, and the fiber flow in the center of the die is axial. The metallographic structure of a mold with a fiber flow structure is tested according to the NADCA#207-2003 standard. Between B3 and B5, its internal structure is not uniform enough, not dense enough, and the carbide shape is not regular enough. The mold produced by the original process cannot Meet ...

AI Technical Summary

Problems solved by technology

[0002] H13 hot work die steel is the main material of the hot extrusion die used in the hot extrusion process of aluminum profiles. At present, the axial forging process is mainly used in China to make hot extrusion dies. The fiber flow direction in the center of the die is axial. The metallographic structure of the mold with a fiber flow direction structure is inspected according to the NADCA#207-2003 standard. Between B3 and B5, the internal structure is not uniform, dense enough, and the shape of the carbide is not regular enough. The mold produced by the original process cannot Meet the production requirements of large hot extrusion machines

Due to the short service life of the mold in the production process of large-scale industrial aluminum profile hot extrusion, it seriously affects the working efficiency of the hot extrusion machine and the production cost of industrial aluminum profile enterprises, and at the same time restricts the development of ultra-large industrial aluminum profile extrusion technology in China

Images