Stirring cooling device and friction stir welding machine

Abstract

The invention discloses a stirring cooling device and a friction stir welding machine. The stirring cooling device is used for cooling a welding machine stirring head and comprises a fixing frame, a bell-shaped mist cover installed on the fixing frame, a gas spray nozzle located at the side portion of the mist cover and used for spraying water mist into an inner cavity of the mist cover, a water trough located in the lower edge of the mist cover and used for collecting cooling water, and a water suction pipe with the water inlet end extending into the water trough. The invention further discloses the friction stir welding machine comprising the stirring cooling device. According to the stirring cooling device, the stirring head and the welding area can be cooled at the same time, a workbench cannot be influenced, cooling water can be circularly utilized, and a sprayer is not influenced by the high-speed rotating stirring head.

Description

technical field [0001] The invention relates to welding equipment, in particular to a stirring cooling device and a friction stirring welding machine. Background technique [0002] The friction stir welding method has the advantages of small welding deformation, small residual stress, and can eliminate welding defects such as pores, inclusions, and cracks, and is widely used in various fields. However, in practical applications, this method often causes warping and deformation of the welded sheet, damages the internal structure of the weld, and accelerates the loss of the stirring pin due to excessive heat generation by the friction of the stirring head, which will greatly reduce the welding quality and efficiency. In addition, due to the high speed of the stirring head, it is not conducive to internal cooling. [0003] The existing cooling device for friction stir welding can only partially cool the high-speed rotating stirring head and the cooling water can only circulate...

AI Technical Summary

Problems solved by technology

Prior Art 1 proposes a retractable double-shouldered stirring head, but does not propose a specific method for how to retract the high-speed rotating stirring needle; Prior Art 2 proposes a cooling method for friction stir welding, which mainly uses cooling water The purpose of cooling the stirring head is achieved by entering the stirring head through the main shaft and opening holes in the stirring head, but it cannot be realized in the case of ultra-high speed (the main shaft speed is higher than 10,000 revolutions per minute), and the vibration generated by high-speed rotation will cause The internal water inlet pipe rubs or even collides with the high-speed rotating mixing head. The huge centrifugal force caused by the ultra-high speed may cause the water inlet pipe to break instantly and fly away, causing a great safety hazard, high cost, and poor interchangeability; During the process, the water flow thrown out from the small side hole is easy to flow back along the upper end surface and the cylindrical surface, affecting the internal insulation of the motor and greatly weakening the cooling effect

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