A method for additive manufacturing of plastic powder conformal stepped temperature bed

Abstract

An additive manufacturing method using a plastic powder conformal cooling stepped temperature bed. The method comprises the following steps: adding powder, scraping powder, performing primary heating, performing secondary heating on a selected region, performing laser sintering, and lowering the powder bed by the thickness of a layer and repeating the preceding steps. The additive manufacturing system stops heating of the plastic powder, the temperature of the shaping cylinder drops, and after the sintered molten plastic powder cools and solidifies, a plastic product is formed. The invention overcomes the technical defect in the prior art that plastic powder degrades or is excessively cross-linked in conventional plastic powder shaping processes adopting laser sintering, preventing the physical properties of unsintered plastic powder in the shaping cylinder from deteriorating due to high temperature, such that no plastic powder has to be discarded, and powder can be reused without requiring combination with a high ratio of new powder, thereby significantly reducing plastic powder costs for sintered plastic products.

Description

【Technical field】 [0001] The invention relates to a laser sintering plastic powder additive manufacturing method of a conformal step temperature bed. 【Background technique】 [0002] The existing laser sintering plastic powder additive manufacturing process: under the 3D printing data processing system, the 3D digital model of the plastic product is sliced ​​and the laser scanning path file is generated, and then imported into the laser sintering additive manufacturing system, and the working platform in the molding cylinder is lowered by one layer , the scraper moves to evenly spread a layer of powder on the working platform, the system starts the heating element, uniformly heats all the plastic powder on the working platform to a temperature close to the melting point, and then irradiates the area to be sintered by laser scanning, so as to achieve the plastic in this area. The powder is fused and sintered together with the previous layer, as figure 1 As shown, a4 is the ar...

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Problems solved by technology

In this process, usually only 5-15% of the plastic powder can be made into plastic products, which makes the cost of laser sintering additive manufacturing of plastic products high, and it is difficult to apply to large-scale additive manufacturing of plastic parts, and has not been popularized for a long time.

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