Inside-laser coaxial powder feeding laser impacting and forging composite machining forming device and method

Abstract

The invention relates to an inside-laser coaxial powder feeding laser impacting and forging composite machining forming device and method. The device comprises a master controller, a pulse laser device, a continuous laser device, a temperature inductor, a coaxial powder feeding device, a visual tracking system, a workbench, a mechanical arm, a metal powder container and a gas container. The pulse laser device, the continuous laser device, the temperature inductor and the visual tracking system are all arranged above the workbench. The mechanical arm tightly clamps the coaxial powder feeding device, so that the coaxial powder feeding device is located between the continuous laser device and the workbench, and is coaxial with the continuous laser device. The coaxial powder feeding device communicates with the metal powder container and the gas container. The pulse laser device, the continuous laser device, the temperature inductor, the visual tracking system, the mechanical arm, the metal powder container and the gas container are all connected with the master controller. The inside-laser coaxial powder feeding laser impacting and forging composite machining forming device and method can solve the problems of insufficient fusion and incomplete fusion of the Gaussian light spot edges, inner defects of gas holes, incomplete fusion, cracks and shrinkage are effectively eliminated, and the inner stress state of a formed part is greatly improved.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to an optical coaxial powder feeding laser impact forging compound processing forming device and method. Background technique [0002] Additive manufacturing technology is a technology that uses CAD design data to accumulate material layer by layer to manufacture solid parts. Among them, laser additive manufacturing (Laser Additive Manufacturing, LAM) technology is an additive manufacturing technology that uses laser as an energy source. It is classified according to its forming principle and can be divided into three-dimensional laser forming technology with synchronous material feeding as the main technical feature. (Laser Solid Forming, LSF), and the selective laser melting technology (Selective Laser Melting, SLM) with powder bed as the main technical feature. LSF technology can achieve high-efficiency manufacturing of complex high-performance components with mec...

AI Technical Summary

Problems solved by technology

[0004] However, because the laser emitted by the laser is Gaussian light, that is, the laser energy density in the spot is Gaussian in distribution, resulting in a high center temperature, under-melting and impermeability are prone to occur on both sides of the melting channel, and the side wall surface of the cladding part is relatively rough.

In addition, the simple laser cladding 3D forming process may produce various special internal metallurgical defects in the local area of ​​the part due to process parameters, external environment, fluctuation and change of molten pool melt state, transformation of scanning filling trajectory, etc., such as , internal defects such as porosity, lack of fusion, cracks and shrinkage porosity

Moreover, as the high-energy laser beam is heated and cooled periodically for a long time, the rapid solidification and shrinkage of the moving molten pool under the strong constraint at the bottom of the pool, and the associated short-term non-equilibrium cyclic solid-state phase transition will generate a huge amount of energy inside the part. Internal stress can easily lead to serious deformation and cracking of parts

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