Air cold plate sealing forming technology of aluminum alloy

Abstract

A aluminum alloy air-cooled freezing-plate sealing shaping process includes the following steps: 1. processing the appearance of freezing-plate, dissipating heat fins and cover plate parts according to structure design, the structure design of freezing-plate is flush type cavity structure, the two ends of freezing-plate shell is equipped with 2-3 soldering fabrication holes with diameter of 2-3mm; 2. welding the dissipating heat fins and freezing-plate shell, cover plate through the soldering method in nitrogen protection furnace; 3. milling out printed circuit board slots on the freezing-plate shell; welding the cover plate and shell vertical soldering seam through stirring friction welding; 5. mechanical processing the appearance and two end ventilators of freezing-plate according to the drawings requirements, processing the soldering fabrication holes into two end ventilators. The aluminum alloy freezing-plate using the art method of combination of soldering and stirring friction welding in the invention increases the resistant finely processed capacity of brazing seam surface, ensures the hermeticity requirement after finely process aluminum alloy freezing-plate and increases the welding yield rate of electronic structure cabinet.

Description

technical field [0001] The invention relates to the manufacture of an aluminum alloy air-cooled cold plate for an electronic equipment case. Background technique [0002] The chassis widely used in sea, land and air is a sophisticated and complex structure that receives the heat of internal components and exports the heat to the surrounding environment. The chassis realizes the heat dissipation requirements of the internal structure by introducing a certain pressure of cold air. In order to prevent the humid cooling air from condensing in the working environment with alternating temperature and humidity, which will affect the normal operation of the electronic equipment in the case, the case must adopt a full metal seal design. Generally, the air duct and connection welds of the case for radar are required to be airtight. 3.5Kpa without leakage. [0003] The geometric shape of the chassis is mostly a flat cuboid. Generally, the chassis is composed of a front frame, left and...

AI Technical Summary

Problems solved by technology

At present, vacuum brazing and gas shielded brazing methods are mostly used at home and abroad to realize the connection of cold plates [see: Song Jun, Research on Processing Technology of Phased Array Radar Cold Plates. Electronic Mechanical Engineering 2002.Vol 8.No.3; Yu Honghua , the application of brazing technology in electronic products. Electromechanical Engineering 2003 Vol 19.No.3], the brazing process can be produced in batches, and the production efficiency is high, but the joint strength of brazing is low, and the processing and assembly of parts, cleaning Disadvantages of strict requirements

At the same time, the density of the brazing seam is poor. For the cold plate that requires surface processing after one welding, leakage after welding seam processing is prone to occur, and the product scrap rate is high.

Although the vacuum brazing process has improved the weld density of the cold plate, the current vacuum brazing cold plate structure can only use LF21 anti-rust aluminum material, the joint strength is low (only 100Mpa), and the vacuum brazing process is complicated to produce Inefficiencies still exist

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