Integrated process of vacuum brazing and heat treatment for aluminum alloy gas circuit board

Abstract

The invention relates to a vacuum brazing and heat treatment integrated process of aluminium alloy gas circuit board. The specific process parameters are that the aluminium alloy gas circuit board is heated to 400 DEG C, heating is conducted for 35-40 min, thermal insulation is conducted for 60-80 min, and the vacuum degree is larger than 8.0*10-2 Pa; the aluminium alloy gas circuit board is heated to 530 DEG C, heating is conducted for 15-20 min, thermal insulation is conducted for 60-80 min, and the vacuum degree is larger than 8.0*10-3 Pa; the aluminium alloy gas circuit board is heated to 565 DEG C, heating is conducted for 10-15 min, thermal insulation is conducted for 60-80 min, and the vacuum degree is larger than 4.5*10-3 Pa; the aluminium alloy gas circuit is heated to 610 DEG C, heating is conducted for 10 min, thermal insulation is conducted for 10-20 min, and the vacuum degree is larger than 3.0*10-3 Pa; the aluminium alloy gas circuit board is cooled to 605 DEG C, cooling is conducted for 5 min, thermal insulation is conducted for 10-15 min, outage and cooling are contacted until the temperature is 540 DEG C, and the aluminium alloy gas circuit board is put out of a furnace and is subjected to wind quenching to be cooled to be at the room temperature. The vacuum brazing and heat treatment integrated process of the aluminium alloy gas circuit board has the advantages that the production process is simple, the cycle is short, the consumed energy is little, the production percent of pass is high, and the production cost is low. The percent of pass of the welding joint of the aluminium alloy gas circuit part is improved to 90% from the original 40%, and a good effect is achieved.

Description

technical field [0001] The invention relates to an integrated process of vacuum brazing and heat treatment of an air circuit board, in particular to an integrated process of vacuum brazing and heat treatment of an aluminum alloy air circuit board. Background technique [0002] The brake air circuit boards used in bullet trains and railway locomotives mainly integrate the complex air circuits of the brake system. The principle is similar to that of integrated circuit boards. They are important components of brake systems in bullet trains and railway locomotives. Small, complex structure, high flatness requirements after brazing and heat treatment (flatness less than 0.5mm), high mechanical properties after heat treatment (tensile strength higher than 172MPa, yield strength higher than 90MPa, can reach T4 state), brazing Higher requirements for inner cavity cleanliness. For a long time, due to the complex structure of the gas circuit board, the high mechanical performance req...

AI Technical Summary

Problems solved by technology

This conventional process method not only has low production efficiency, high energy consumption, and long production cycle, but also the product is prone to bump damage during disassembly and transfer, and the product is greatly deformed during heat treatment and scrapped, resulting in low production qualification rate and production failure. high cost

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