Method and device for liquid nitrogen cooling of aluminum profile extrusion die

Abstract

The invention discloses a method and a device for liquid nitrogen cooling of an aluminum profile extrusion die. According to the method and the device, a channel is opened on an extrusion die cushion according to the shape of the cross section of the die cushion, liquid nitrogen is input into the channel during the extrusion process of profiles, the liquid nitrogen cooling process is controlled by a closed ring control system, and the temperature of an extrusion die is controlled at 440-480 DEG C. With the method and the device for liquid nitrogen cooling of an aluminum profile extrusion die, the problems that the product quality is lowered and the extrusion efficiency is low caused by overhigh temperature during extrusion of aluminum alloy profiles are avoided, the extrusion speed of the die is improved by 10-50 percent, the service life of the die is prolonged, and meanwhile, the product quality is improved, the dimension precision of aluminum profiles machined is higher, the surface smoothness is better, and the rejection rate is reduced.

Description

technical field [0001] The invention relates to the field of metal profile processing, in particular to a liquid nitrogen cooling method and device for an aluminum profile extrusion die. Background technique [0002] With the take-off of China's economy, the production, application and consumption of aluminum alloy profiles have developed rapidly. In 2007, the output of aluminum profiles in China has reached about 5.4 million tons, of which the output of construction aluminum profiles has exceeded 3.9 million tons, which has been stable for three consecutive years. Ranking first in the world, it has become the world's largest producer and consumer of extruded aluminum. Extruded aluminum materials include pipes, rods, profiles and wires. Among them, the production of extruded profiles is the most difficult, with the most varieties and specifications and the largest output. [0003] However, the low speed and low efficiency of aluminum extrusion hinder the further improvement...

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Problems solved by technology

[0006] In view of the shortcomings of the above-mentioned existing methods, the purpose of the present invention is to provide a liquid nitrogen cooling method and device for aluminum profile extrusion dies, aiming at solving the problem that the current aluminum alloy profile extrusion process causes the product quality to decline due to excessive temperature, which affects processing. efficiency problem

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