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一种铝合金换热器真空钎焊新工艺最近在航空航天部六○九所试验成功,并通过了部级鉴定。 该项工艺采用微机多点测温、控温技术和分区加热对旧式真空钎焊炉进行技术改造,实现控温自动化,提高了控温精度(±1℃)和炉温的均匀性(温差小于3℃);并通过一系列工艺试验,得出了合理的钎焊过程热循环曲线、焊接工艺参数和最佳的加镁量等,同时设计了适用的焊接夹具。从而使铝合金钎焊技术达到了工程化应用要求,成功实现了铝合金换热器芯体的钎焊。该项技术提高了产品的质量和使用寿命,使合金换热器钎焊技术上了一个新台阶,并且首次用于国产飞机换热器生产。
A new aluminum alloy heat exchanger vacuum brazing technology recently in the Department of Aerospace 600 test success, and passed the ministerial identification. The technology uses microcomputer multi-point temperature measurement, temperature control technology and district heating technical transformation of the old vacuum brazing furnace, to achieve temperature control automation, improve the temperature control accuracy (± 1 ℃) and the uniformity of the furnace temperature (temperature difference is less than 3 ℃). Through a series of technological tests, the reasonable thermal cycle curve, welding process parameters and the optimal magnesium addition were obtained. At the same time, the suitable welding fixture was designed. So that the aluminum alloy brazing technology has reached the engineering application requirements, the successful realization of the aluminum alloy heat exchanger core brazing. This technology improves product quality and service life, makes the alloy heat exchanger brazing technology to a new level, and is firstly used for domestic aircraft heat exchanger production.