Preparation method for oxygen-free copper tube for magnetron

Abstract

The invention relates to a preparation method for an oxygen-free copper tube for a magnetron. The preparation method is characterized in that the contents of copper and silver in a material of the oxygen-free copper tube is larger than or equal to 99.97%, and oxygen content is smaller than or equal to 0.001%. The preparation method includes following process steps: 1, smelting: placing number 1 high-purity cathode copper in a power frequency induction furnace with a core, raising the temperature of the furnace to smelt the cathode copper into copper liquid, adding lanthanum with the mass fraction ranging from 0.01% to 0.016% into the copper liquid, keeping the copper liquid at the temperature of 1170 + / -10 DEG , and covering a charcoal layer with the thickness ranging from 100mm to 120mm and the charcoal granularity ranging from 40mm to 60mm on the surface of the copper liquid; 2, upward continuous casting; 3, precise cold rolling; 4, recrystallization; 5, cold drawing forming; and 6,finishing. The oxygen content is low, electric conduction is excellent, yield is high, and metal loss is low.

Description

technical field [0001] The invention relates to a preparation method of an oxygen-free copper tube for a magnetron, belonging to the technical field of nonferrous metal processing. Background technique [0002] The basic principle of a microwave oven is to use a magnetron to convert electrical energy into microwave energy to achieve the purpose of heating food. Therefore, the magnetron, as the heart of a microwave oven, is made of high-precision, high-purity oxygen-free copper tubes. In the past, most of them relied on imports. And import prices are high, breaking the bottleneck of domestic microwave oven production, exploring new techniques and methods for the production of oxygen-free copper tubes for magnetrons, achieving engineering production of oxygen-free copper tubes, and improving the production efficiency and quality of oxygen-free copper tubes has become a hot topic . [0003] The traditional production process mostly adopts the process of vertical semi-continuou...

AI Technical Summary

Problems solved by technology

The melting furnace process of vertical semi-continuous casting adopts the method of "casting from the bottom". During casting, the copper liquid has the opportunity to contact with oxygen, so the oxygen content cannot be controlled; for horizontal continuous casting, the melting and casting processes are separated in two Carried out on a single electric furnace, the melt also has the opportunity to contact oxygen during the converter, and the metal loss is also large

Therefore, these two processes have high oxygen content and high resistance, which affects the conductivity and affects the quality of the product.

[0004] Chinese patent 200910152606.6 discloses a method of upward continuous casting to produce brass tube blanks. It adopts upward continuous casting to reduce metal loss and increase production capacity, but it only uses charcoal layers to isolate copper and oxygen. Contact, the oxygen content of the produced copper tube is still high, which cannot meet the needs of the magnetron