Novel rapid molding device and powder feeding and spreading method thereof

Abstract

The invention discloses a novel rapid molding device and a powder feeding and spreading method thereof. The novel rapid molding device comprises a powder feeding cylinder, a molding cylinder, an overflow powder cylinder, a laser window, a powder feeding scraper plate and a bucket type double-scraper plate powder spreading mechanism, and also comprises a powder feeding cylinder heat preservation chamber, a powder feeding cylinder heater, a molding cylinder heat preservation chamber, a molding cylinder heater and a powder feeding cylinder working panel, the powder feeding scraper plate linearlymoves from the left to the right and pushes powder extruded through the lifting of the piston of the powder feeding cylinder to a powder falling opening at the right end of the powder feeding cylinderheat preservation chamber, the powder freely falls into two bucket scraper plates from top to bottom, and the bucket scraper plates horizontally move from the left to the right to push the powder tothe molding cylinder, spread the powder on the molding cylinder and send superfluous powder outside the two bucket scraper plates into the overflow powder cylinder in order to complete one-time powderspreading. The novel rapid molding device and the powder feeding and spreading method thereof have the advantages of effective improvement of the powder feeding and spreading manner, improvement of the powder spreading quality, reduction of material wastes, and improvement of the 3D printing quality and the printing efficiency.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a novel rapid prototyping device and a method for feeding and auxiliary powder thereof. Background technique [0002] In the rapid prototyping equipment that uses powder as raw material to manufacture three-dimensional objects, there are two common powder feeding and spreading methods: one is the bottom feeding method, which is through the lifting of the piston of the powder supply cylinder and the reciprocation of the powder spreading roller The movement is coordinated to complete; the other method is the powder-feeding method, which is completed by the quantitative powder-feeding device and the reciprocating motion of the powder-spreading bucket scraper. [0003] The equipment structure layout of the powder feeding method is as follows: figure 1 shown. The powder feeding method includes a forming cylinder 2 and two powder supply cylinders 1 located on both sid...

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Problems solved by technology

[0005] These two powder feeding methods have different technical problems. For the bottom powder feeding method, there are mainly such technical problems: (1) The molding chamber is large, and the heating temperature is not easy to control uniformly; (2) The powder supply cylinder and the molding machine The heating of the cylinder is located in the same large chamber, which leads to the problem of cross-effect of the heating of the two heating systems; since the heating of the molding cylinder is the main heating, and the heating of the powder supply cylinder is auxiliary heating, the heating temperature of the molding cylinder is guaranteed In some cases, it is difficult to control the temperature of auxiliary heating within the ideal temperature range, thus affecting the quality of auxiliary powder; The resulting plane is a wavy corrugated plane, which affects the quality of auxiliary powder

For the powder feeding method, there are mainly such technical problems: (1) uneven powder falling affects the quality of auxiliary powder and causes waste of powder; (2) powder falling from the powder falling mechanism directly flows to the auxiliary powder scraper In the hopper, such a structure cannot heat the powder before auxiliary powder

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