A method and device for manufacturing a three-dimensional object

Abstract

The present invention describes a method of achieving three -dimensional object manufacturing through the energy beam -by -layer scanning of the powder layer, including a layer of powdery material pavement on the bottom plate or a solid layer to form a powder layer; at least part of the preheating beam to the powder layer to the powder layerThe area is implemented by the area to reach the setting value of the powder temperature in the preheating area. The setting of the preheating beam is matched with the absorption efficiency of the powder;Sexual scanning, complete the firing of the powder layer. The preheating beam is a single wavelength laser beam. After uniformly forming a light beam with a uniform energy distribution and divergent, the preheating area is performed on the preheating area.This method can preheat the powder materials in the use of powder bed increasing manufacturing technology quickly and efficiently, thereby reducing the difference between the temperature difference between the three -dimensional object and the surroundings during the manufacturingquality.

Description

Technical field [0001] The invention relates to a method and related equipment for manufacturing a three-dimensional object layer by layer through the action of an energy beam with powder. Background technique [0002] Common additive manufacturing methods include the use of energy beams (such as lasers or electron beams) to selectively scan the spreading layer of powder materials, and the three-dimensional objects are finally obtained by layer-by-layer scanning and curing accumulation. The scanning position of the energy beam is the corresponding cross-sectional part of the three-dimensional object to be manufactured in the layer. The temperature of the powder material corresponding to this part rises rapidly after the action of the energy beam, and the material is melted instantly and solidified after cooling. After the scanning of a layer is completed, a new layer of powder is continued to be spread on the completed scanning layer, and the cross-sectional position correspondin...

AI Technical Summary

Problems solved by technology

However, the problem is that the infrared radiation heater has a wide range of radiation wavelengths, and the powder has different absorption rates for different wavelengths of radiation, which affects the temperature balance of the powder surface, and the time for the powder material to absorb infrared radiation to the set temperature is longer, which is more due to heating. Due to the low directivity of the device radiation, the working cavity will also heat up due to radiation, thus putting forward higher temperature tolerance requirements for the cavity and the components in the cavity

In the prior art, a heater is installed under the substrate of the laser sintering equipment for manufacturing metal three-dimensional objects to preheat the substrate, and the three-dimensional object is kept warm through the heat conduction of the substrate, but the substrate has a large thermal resistance, low heat transfer efficiency and time-consuming heating longer

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