Extruding machine and method of utilizing extruding machine to manufacture large-diameter thick-wall seamless copper pipe

Abstract

The invention relates to a copper pipe manufacturing method, in particular to a method of utilizing an extruding machine to manufacture a large-diameter thick-wall seamless copper pipe. According to the method, an extruding backing ring and thermal insulation cotton are additionally arranged between an extruding pad and a copper blank in the extruding machine, so that the red copper blank can rapidly heat up and expand after being in contact with the extruding backing ring; the unilateral gap between the extruding backing ring and an extrusion container is smaller than or equal to 1.5mm; the backstreaming of the copper blank from the gap between the extruding pad and the extrusion container in the extruding process is prevented; after the blank is manufactured, the blank is subjected to zero-defect treatment; the surface, in contact with the blank, of a die in the extruding process is preheated; the preheating surface of the die is smeared (lubricated) and extruded by adopting a special copper pipe extrusion lubrication medium; the inner and outer surface quality of the large-diameter thick-wall seamless copper pipe is effectively solved, so that the product quality is effectively improved. The manufacturing method has the advantages that the manufacturing flow is simple; the utilization rate of materials is high; the manufacturing requirements of different specifications of products are met; the manufactured product has the advantages that the whole grain size is uniform; the product performance is good; the service life is long, and the like; and therefore, the product has the advantages of low production cost, strong market competitiveness and the like.

Description

Technical field: [0001] The invention relates to a method for preparing a copper pipe, in particular to a method for preparing a large-diameter thick-walled seamless copper pipe by using an extruder. Background technique: [0002] The large-diameter thick-walled seamless copper pipe extrusion manufacturing is the first in China. [0003] Large-diameter thick-walled seamless copper tubes are widely used in the manufacture of titanium alloy gold, nickel-based alloys and special steel smelting crystallizers. In recent years, with the development of my country's large aircraft, deep-water submarines and other industries, the amount of crystallizers used in vacuum smelting has continued to hit a record high, forcing my country's overall industrial equipment level to be further improved. The crystallizer is called the "heart" of electroslag and vacuum smelting equipment, and the domestic copper crystallizer is usually manufactured by two processes: one is that the copper ingot ...

AI Technical Summary

Problems solved by technology

In the first forging method, the forging process needs to be heated and forged in separate fires, and the forming temperature and deformation amount of each area during the forging process are inconsistent, resulting in uneven overall performance of the product, and the mold is prone to "waist shrinkage" during use. " and other local defects, leading to premature scrapping of the crystallizer

The second method, the copper plate roll welding crystallizer, the welds are distributed in a straight line along the axial direction, and the structures of the welding fusion zone, heat-affected zone, and body are inconsistent. During use, it is used in the process of high-temperature molten metal solidification inside the crystallizer. The outside is usually cooled by water. During the repeated use of the mold, the welding area is subject to periodic thermal expansion and contraction, which leads to premature cracking and scrapping of the welding area during the use of the mold, and cracking in the welding area will make it difficult to Weld repairs in cracked areas

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