A multi-element heating method for a vacuum diffusion brazing furnace

Abstract

The invention provides a diversified heating method for a vacuum diffusion brazing furnace and belongs to the technical field of brazing. The diversified heating method for the vacuum diffusion brazing furnace adopts ternary heating modes: resistance heating, induction heating and furnace body temperature control. In the induction heating mode, an induction coil is adopted to heat. In the furnace body temperature control mode, a heating element in the furnace body is used to heat, so that beneficial effects are obtained. By performing heating treatment by adopting the brazing furnace, the heat conductivity is high, heat is quickly diffused, the heating speed can be remarkably improved, and the heat conductive efficiency is improved. Meanwhile, after annealing / diffusing, the performance index of a heated workpiece is higher.

Description

technical field [0001] The invention belongs to the technical field of brazing, and in particular relates to a multi-element heating method of a vacuum diffusion brazing furnace. Background technique [0002] Among the brazing methods, resistance brazing has the advantages of rapid heating, high production efficiency, very concentrated heating, little influence on surrounding heat, simple process, and easy automation; induction brazing has fast heating speed, less damage to workpieces, and Excellent mechanical properties, welding of complex interfaces can be realized; the main advantage of vacuum brazing is high brazing quality, which can easily braze metals and alloys that are difficult to braze by other methods. [0003] In vacuum brazing, since there are few gas molecules in the vacuum environment, the heating process of the workpiece mainly depends on the heat radiation of the heating element, the internal heat conduction of the workpiece and the contact heat conduction ...

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Problems solved by technology

[0003] In vacuum brazing, since there are few gas molecules in the vacuum environment, the heating process of the workpiece mainly depends on the heat radiation of the heating element, the internal heat conduction of the workpiece and the contact heat conduction of the tooling. The heating method of the workpiece is mainly heat radiation, and the heating elements used are mainly: Molybdenum ribbon, tungsten, nickel-chromium, iron-chromium-aluminum, carbon-silicon rod, silicon carbide, etc., but the heating speed of this method is slow, there is no conductive medium in vacuum conditions, and the heat required for heating can only be realized by thermal radiation, so the work efficiency is very low

[0004] Chinese patent 03212485.6 discloses a vacuum annealing furnace, which provides a vacuum furnace with a temperature of 1400°C and a vacuum degree of 10 -3 Pa, has the characteristics of compact structure, convenient operation and power saving, but complex structure and slow heating speed

Chinese patent 201220093108.6 discloses a resistance induction composite heating furnace, which is composed of an outer layer of refractory insulation material, a resistance heating element, and a heating vessel. The spiral heating element surrounds the heating vessel. When the high frequency and intermediate frequency power are connected , the resistance itself starts to heat, and the intermediate frequency power supply leads to the resistance to form an induction current for induction heating. This device has high heating efficiency, but the heating range is small and the temperature is low, which cannot meet the heating needs of high temperature and large workpieces.

[0005] In order to further improve the heating efficiency, there have been reports at home and abroad using heating methods such as workpiece preheating and strong light radiation. However, the workpiece preheating method makes the workpiece easy to oxidize, while the strong light radiation method has a small heating range for the workpiece and the heating cost is too high. high

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