Temperature control device for microtube extrusion

Abstract

The invention discloses a temperature control device for microtube extrusion. The temperature control device for microtube extrusion comprises a sleeve provided with an extrusion channel in the axialdirection. The extrusion channel is composed of a heating channel and a cooling channel. A heating cavity is formed in the wall of the portion, on the periphery of the heating channel, of the sleeve.A spiral pipe is arranged in the heating cavity. Both ends of the spiral pipe stretch out of the heating cavity. An electric heating wire is arranged in the spiral pipe in a penetrating mode. Both ends of the electric heating wire stretch out of the spiral pipe to be connected with a metal wire of an electric connector. The electric connector is fixed to a pipe orifice of the spiral pipe. A cooling cavity is formed in the wall of the portion, on the periphery of the cooling channel, of the sleeve. A cooling pipe is arranged in the cooling cavity and filled with cooling water. A water inlet anda water outlet of the cooling pipe both penetrate out of the cooling cavity. The temperature control device for microtube extrusion is simple in structure and convenient and fast to disassemble, micro-type, integrated and automatic heating and cooling during heating extrusion are achieved; and through heating and cooling, a microtube can be extruded smoothly, the size of a finished tube is ensured, and internal and surface defects are reduced.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a microtube extrusion temperature control device. Background technique [0002] Metal microtubes are widely used in high-precision instruments and equipment such as aerospace pipelines and interventional stents. Generally speaking, the preheating of metal pipes before extrusion is one of the most critical steps in the hot extrusion profile preparation process. During hot extrusion plastic forming, the higher the deformation temperature, the smaller the flow stress of the material and the better its plastic forming performance, so it is easier to prepare high-quality extrusion profiles. However, if the deformation temperature exceeds the temperature required by the process, metallurgical processing defects such as excessive grain growth, overburning or overheating will occur. At the same time, during the hot extrusion process of metal pipes, the tem...

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Problems solved by technology

However, if the deformation temperature exceeds the temperature required by the process, there will be metallurgical processing defects such as excessive grain growth, overburning or overheating.

At the same time, during the hot extrusion process of metal pipes, the temperature of the outer surface of the extrusion die increases with the increase of the temperature of the material, which eventually leads to a decrease in the hardness of the surface layer of the die material, which is prone to physical defects such as pits and deformation, resulting in Extruded pipes are not uniform in size, reducing the life of the extrusion die

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