Laser 3D printing device for improving forming density and 3D printing method

Abstract

The invention discloses a laser 3D printing device for improving forming density and a 3D printing method. According to the 3D printing device, a forming bin is sealed; a laser perspective window is mounted on the top surface of the forming bin; a Y-axis linear motor is fixed on the top surface and is located on one side of the laser perspective window; the Y-axis linear motor comprises a first rotor seat; a Y-axis guide rail is fixed on the top surface and is provided with a guide rail sliding block; one end of the X-axis linear motor is fixed in the guide rail sliding block; and the other end of the X-axis linear motor is fixed on the first rotor seat; the X-axis linear motor comprises a second rotor seat; a connection plate extending towards the laser perspective window is fixed on thesecond rotor seat; a collimating mirror is fixed on the connection plate; optical fiber, the collimating mirror, a beam expander and a flat-top beam shaper are communicated with each other in sequence; the flat-top beam shaper is located on the outer side of the X-axis linear motor; and the output end of the flat-top beam shaper faces to the laser perspective window. According to the laser 3D printing device for improving the forming density, the high-pressure forming bin and the flat-top light beam shaper are arranged; the burning loss phenomena of vaporization and evaporation of a magnesium-based material in the forming process are reduced; and the density of magnesium-based forming parts is improved.

Description

Technical field[0001]The present invention belongs to the technical field of 3D printing, and in particular relates to a laser 3D printing device and a 3D printing method for improving forming density.Background technique[0002]3D printing is a kind of rapid prototyping technology, also known as additive manufacturing. It is a technology that builds objects based on digital model files and uses bondable materials such as powdered metal or plastic to print layer by layer. The technical principle is "layered and sliced, layer by layer", similar to the concept of "calculus" in mathematics. The specific working process is as follows: the first step is to use forward or reverse modeling methods to build a lattice part model; the second step is to use slices to slice the model layer by layer to convert the 3D model into a multi-layer 2D picture , And then plan the scanning path layer by layer; in the third step, the printer performs layer-by-layer cumulative manufacturing according to the ...

AI Technical Summary

Problems solved by technology

However, the melting point and boiling point of magnesium metal are low and close to each other (T 熔点 =650°C, T 沸点 =1107 ℃), high vapor pressure, low surface tension, and low density, which lead to the vaporization of magnesium-based materials in the process of laser preparation of magnesium alloy bone implants, resulting in lower forming density of magnesium alloy bone implants.

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