WARM EXTRUSION OF AA7075 ALUMINUM ALLOY

Abstract

The aim of this paper is to present the warm extrusion process of AA7075
aluminum alloy, which was produced in Vietnam. The forward extrusion method
and backward extrusion method were used. The process parameters considered
include the different deformation temperatures, Tw (2000
C, 2200
C, 2400
C, 2600
C,
2800
C, and 3000
C) and machining speed, vs (30mm/s) and coefficient of friction, µ
(0.3). The responses measured were extrusion force (F) and hardness of products
(HV). The results show that the forming ability of AA7075 can be significantly
improved when the forming process is carried out in the temperature range from
2000
C to 2600
C. At forming temperature over 2600
C, the forming ability is still
guaranteed, but the surface quality of the product is low and the hardness of the
product is reduced due to the influence of high temperature. This is the basis for
the selection of technological parameters to implement the extrusion process of
high strength aluminum alloys for industrial applications.