Brazing and nondestructive detecting method of drill bit for lunar soil drilling

Abstract

The invention discloses a brazing and nondestructive detecting method of a drill bit for lunar soil drilling. The method comprises the following steps: (1) a drill bit basal body, a cutter, a weldingwire and a flux are prepared; (2) sand is blasted to the drill bit basal body and the cutter; and then, the welding wire, the drill bit basal body and the cutter are cleaned by using anhydrous ethanol; (3) the cutter and the drill bit basal body are assembled; (4) welding nozzle parameters for brass brazing are set to obtain brazing flame; (5) the drill bit basal body and the cutter assembled in the step (3) are preheated according to the brazing flame in the step (4); (6) the cutter and the drill bit basal body preheated in the step (5) are welded; (7) the cutter and the drill bit basal bodywelded in the step (6) are insulated; and (8) the nondestructive detection is performed on the cutter and the drill bit basal body insulated in the step (7). Key process parameters are strictly controlled, and the welding line quality is detected, so that the welding reliability of the drill bit is high.

Description

technical field [0001] The invention belongs to the technical field of deep space exploration, and in particular relates to a drill bit brazing and non-destructive testing method for drilling lunar soil. Background technique [0002] The drilling and sampling device for the third phase of lunar exploration needs to use drilling and coring technology to drill lunar soil samples at a depth of about 2 meters in the target area of ​​the landing site. The object to be drilled is the complex working condition of the lunar soil, which has the characteristics of high density and low thermal conductivity. During the drilling process, it will be subjected to complex force loads and generate a lot of heat, which will affect the hardness and strength of the drilling tools. , wear resistance, heat resistance and other properties put forward high requirements, which poses a challenge to the method of drill bit brazing and testing. [0003] Copper-based or nickel-based manual brazing is g...

AI Technical Summary

Problems solved by technology

The object to be drilled is the complex working condition of the lunar soil, which has the characteristics of high density and low thermal conductivity. During the drilling process, it will be subjected to complex force loads and generate a lot of heat, which will affect the hardness and strength of the drilling tools. , wear resistance, heat resistance and other properties put forward high requirements, thus posing challenges to the methods of drill bit brazing and testing

[0003] Copper-based or nickel-based manual brazing is generally used for the brazing of small-sized drill bits on the ground. The key process parameters are not strictly controlled, and the weld quality inspection cannot be carried out, resulting in low reliability of drill bit welding and even overburning. Drill performance degradation

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