A fast ultra-high temperature heating device for 3D printing powder bed

Abstract

The invention belongs to the technical field related to 3D printing, and discloses a rapid ultra-high temperature heating device for a 3D printing powder bed. The device includes a stepped plate, a rapid heating plate and a replacement plate. The stepped plate is used as the substrate in the 3D printing device, the rapid heating plate is used for rapid heating, and the replacement plate is used as a forming table. According to the different materials to be printed and formed, different materials are selected. Replacement plate; the rapid heating plate includes a heat transfer layer, a heating layer, a conductive electrode and a heat insulating layer. The heat transfer layer is arranged above the heating layer and is in contact with the replacement plate for conducting the heat of the heating layer to the replacement substrate. The heating layer The material is graphite, which can quickly heat up in a short time. The heat insulation layer separates the heating layer from the stepped plate to prevent heat from being conducted to the stepped plate and then dissipated into the forming cylinder. The invention prevents heat transfer to the forming cylinder and protects the forming cylinder; it can be used for forming high-entropy alloys or nanocrystalline alloys, and reduces thermal stress and anisotropy of materials through rapid temperature rise.

Description

technical field [0001] The invention belongs to the technical field related to 3D printing, and more specifically relates to a rapid ultra-high temperature heating device for a 3D printing powder bed. Background technique [0002] With the continuous advancement of science and technology, industrial parts are gradually developing in the direction of precision and complexity. Traditional processing methods such as casting and forging can no longer meet the current manufacturing needs. Therefore, 3D printing technology has emerged as the times require. 3D printing uses digital model files Based on the use of powdered metal, ceramics, plastics and other bondable materials, the method of heating and solidifying the components layer by layer is one of the main means of additive manufacturing. Based on the processing characteristics, 3D printing technology can Produce high-precision, complex-shaped parts. [0003] However, due to the slow heating rate of the substrate in traditio...

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Problems solved by technology

[0003] However, due to the slow heating rate of the substrate in traditional 3D printing, the heat is easy to diffuse into the forming cylinder and damage the cylinder. Therefore, the preheating temperature of the substrate should not be too high. Excellent high-entropy alloys and nanocrystalline alloys, so far, 3D printing equipment cannot solve the above defects

At the same time, the low temperature of the substrate at 200°C will also cause the molten pool to cool at a high speed, and there will be a large temperature gradient, resulting in a large thermal stress after the internal molten pool solidifies, seriously affecting the mechanical properties of the material, and even cracks. Not only that, but also A large number of dendrites increase the anisotropy of molded parts

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