A dual-shoulder friction stir head gas-liquid combined cooling device and cooling method

Abstract

The invention discloses a gas-liquid combined cooling device for a double-shoulder friction stir head. The upper shaft shoulder is provided with a central hole that does not pass through along the axis. An air guide fan is installed on the top of the hole. During the welding process, a huge downward airflow is generated with the high-speed rotation of the stirring head, which forcibly takes away the heat in the center of the stirring head and discharges it from the air guide hole at the lower part of the upper shoulder; the lower part of the lower shoulder is installed There is a hollow cone, the hollow cone contains a shell, the bottom of the shell is provided with an opening, the inner wall of the shell is provided with threads, the lower shoulder and the shell are provided with holes, and the bottom of the shell is provided with a water tank , the opening is in the sink. The dual-shoulder friction stir head gas-liquid combined cooling device of the present invention adopts the combination of air flow and cooling liquid to cool the non-welded parts of the upper and lower shaft shoulders of the friction stir head, thereby reducing the temperature of the friction stir head, and also reduces the temperature of the friction stir head. Indirect control of the welding temperature field.

Description

technical field [0001] The invention relates to a gas-liquid combined cooling device and a cooling method for a double-shoulder friction stir head, and belongs to the field of welding. Background technique [0002] Since the invention of the friction stir welding method by the British Welding Institute (TWI) in 1991, this technology can eliminate welding defects such as pores, inclusions, cracks, etc. No arc light, smoke, noise pollution, etc., and at the same time, it can significantly reduce costs, save materials, optimize the structure, and reduce the structural weight of the aircraft, which has attracted the attention of scientific research institutions in various countries. Because this technology has many remarkable features that other methods do not have, it is quickly used in the aerospace field, and this method is selected for the welding of the longitudinal seam of the core-stage tank section of the new generation of launch vehicles. Although high-quality welded j...

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Problems solved by technology

[0003] Patent (application number 201310139472.0) designed a special stirring head and workpiece cooler, the stirring head cooler is installed on the upper end of the welded workpiece protector, the stirring head is installed in the stirring head cooler and the welded workpiece protector, the cooling medium is used Indirect cooling of the friction stirring head, and the structure of the cooler is complicated; the patent (application number 03134361.9) also indirectly cools the friction stirring head through a cooling medium, and the designed cooling liquid system has a complicated structure, but obviously the cooling device required by this method is relatively large. Large and poor applicability; in addition, there is a patent (application number 201310449604.X) to cool the shaft of the spindle head by fixing the cooling plate under the spindle head chassis, but it needs a variety of oil inlet and outlet pipelines, and requires Design accumulators and balancing valves, which is actually an indirect cooling method

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