Method for realizing synthermal extrusion through technological parameter combination control

Abstract

The invention relates to a method for realizing synthermal extrusion of an aluminium alloy material, which aims at obtaining a high-property extruded aluminium alloy product with a uniform structure property along the length direction. The method provided by the invention comprises the following steps: selecting an extruding device and computing the size of an extrusion billet according to a type and a specification of a target product; determining a maximum allowable temperature T1 and a heating temperature T0 of the billet of the extruded aluminium alloy product according to the production experience and the information data, so as to determine an allowable extrusion temperature rise deltaT; and determining an extrusion speed Vj and a heating temperature Tc of an extruding cylinder according to the extrusion flowing deformation characteristics and the balanced heat flow and temperature characteristics of metal. According to the invention, the technical parameters are utilized, so that the synthermal extrusion production can be realized under the uniform heating temperature of the billet and the constant extrusion speed, without reforming the existing extrusion production equipment or increasing any auxiliary equipment; uniform-speed and constant-pressure extrusion can be realized under the constant-temperature (synthermal extrusion) condition; and extrusion load can be reduced and energy consumption of the production can be reduced through reasonably matching the extrusion speed and the heating temperature of the billet.

Description

technical field [0001] The invention belongs to the technical field of extrusion processing of metal materials, and in particular provides a method for realizing isothermal extrusion of aluminum alloy materials. Background technique [0002] Extrusion is an important method for forming metal materials such as aluminum and aluminum alloys. With the rapid development of transportation, aerospace and other fields, the demand for high-performance aluminum alloy materials continues to grow. Due to the continuous improvement of the requirements for product quality uniformity and consistency, and the increasing emphasis of enterprises on improving production efficiency and reducing production costs, since the 1990s, the research, development and application of aluminum alloy isothermal extrusion technology have received more and more attention. [See: Zhang Jun, Yang He, He Yangmin, etc. Research Progress on Key Technologies of Isothermal Extrusion of Aluminum and Aluminum Alloy Pr...

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Problems solved by technology

[0005] On the other hand, due to the low extrusion speed of aluminum alloys with poor extrudability, the speed can be adjusted in a narrow range. When the heating temperature of the billet and the extrusion cylinder is unreasonable, it is easy to cause friction and deformation of the billet in the extrusion cylinder. The temperature rise is less than the temperature drop caused by the conduction and heat dissipation of the tool and mold, resulting in high temperature at the head of the extruded product and low temperature at the tail

Therefore, for this type of alloy, the existing gradient temperature billet isothermal extrusion and speed-controlled isothermal extrusion technologies are difficult to effectively improve the uniformity of the product along the length of the structure and properties, and other control measures need to be taken to achieve isothermal extrusion. extrusion

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