Laser-assisted liquid metal synchronously-casting mould-free forming method

Abstract

The invention relates to a laser-assisted liquid metal synchronously-casting mould-free forming method. The laser-assisted liquid metal synchronously-casting mould-free forming method comprises the steps that (1) a laser device is made to aim at a movement front area to be covered with a melt, the time when the laser device is started and the time when the laser device is stopped are set to be synchronous with the time when a base plate starts to move and the time when the base plate stops moving in control software, a laser device power source is started, the parameters of the laser device are adjusted, and the preparation is made for light emitting; (2) a movement switch is turned on, the melt is squeezed out of a crucible under pressure and falls onto the base plate below an outlet of the crucible, and laser light is irradiated onto the movement front area, of the melt, on the base plate at the same time; and (3) forming is ended, the movement switch is turned off, pressurizing of the melt in the crucible is stopped, the melt stops flowing, and laser light irradiation is stopped at the same time. According to metal formed through cast rolling according to the method, the fineness of grains is high, and the compact degree approximates to or reaches the rolling level or the forging level; meanwhile, metallurgical bonding of interlayer interfaces can be well achieved, and the quality of formed products is high.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and in particular relates to a laser-assisted liquid metal synchronous casting-rolling dieless forming method. Background technique [0002] Additive Manufacturing (Additive Manufacturing, referred to as AM) is a direct manufacturing method based on three-dimensional CAD model data by adding materials layer by layer, and is a manufacturing method for a three-dimensional physical model that is completely consistent with the corresponding mathematical model. [0003] Chinese patent CN201310139419 discloses a mobile micro-die-casting molding method for metal components. The method uses a melt that meets the composition requirements as a raw material, and molds the metal component through a point-by-point layer-by-layer synchronous casting and rolling manufacturing method. [0004] Its specific working principle is: carry out layering and track design on the three-dimensional graphics of metal c...

AI Technical Summary

Problems solved by technology

The difficulty in solving the latter problem is that metal is a good conductor of heat, and the process window for remelting the previous layer of solidified surface layer is not large only by relying on the heat carried by the subsequent melt, and this process window will also increase with the thermal conductivity of the metal. increase and narrow

[0007] In addition, increasing the temperature of the subsequent melt has some negative effects

For example, to reduce the surface tension of the melt, the thickness of the simultaneous casting and rolling space has to be reduced to prevent the melt from overflowing, thereby affecting the processing efficiency

Another example is to make the solidified structure grow due to overheating, thereby reducing the fine-grain strengthening effect of the molded part

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