A laser additive manufacturing or remanufacturing conformal protection method and protective cover

Abstract

The invention provides a laser additive manufacturing or remanufacturing follow-up protection method and a protective cover. The method includes the following steps: adopting a concave protective cover with one side open and sealingly connecting it with a laser cladding head; The inflation port filled with helium inside is connected to the helium storage device with a valve through the inflation port; before work, first fill the protective cover with helium gas from the inflation port to completely expel the air from the protective cover; When working, the protective cover moves together with the laser cladding head, and the nitrogen and oxygen detection heads installed symmetrically near the bottom of the protective cover are used to detect the nitrogen and oxygen content in the protective cover, and the detection signal feedback control The filling amount of helium finally makes nitrogen and oxygen lower than the specified value. The invention can save the cabin and the vacuum unit, not only greatly reduce the cost of the equipment, reduce the weight of the equipment, but also completely change the design mode and structure of the cabin equipment, the processing space is not limited by the volume, the inflation time is short, light and flexible, and convenient for transportation .

Description

technical field

[0001] The invention relates to the field of laser processing, in particular to a laser additive manufacturing or remanufacturing conformal protection method that can move with the laser cladding head so that the laser molten pool is always under the protection of helium gas, and the protection applied to the method cover. Background technique

[0002] Laser additive manufacturing or laser remanufacturing technology uses laser to melt metal powder to form a molten pool on the surface of the workpiece. Driven by 3D forming software and robots, the laser molten pool is solidified point by point and accumulated layer by layer. Due to the high melting point of metal materials, in order to avoid oxidation and nitriding, the laser melting pool must be isolated from the air and placed in an inert gas protection environment. At present, the complete sets of laser additive manufacturing / remanufacturing equipment generally adopt a cabin structure, and the subsystems s...

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