Single-galvanometer big-area additive manufacturing laser forming equipment and forming method

Abstract

The invention relates to single-galvanometer big-area additive manufacturing laser forming equipment and a forming method, and belongs to the technical field of additive manufacturing. The equipment comprises a point light source or linear light source, a galvanometer, a lens, a forming bin, a forming substrate, a transmission mechanism and a fixed platform. The galvanometer or the forming bin canrotate around the center axis of the forming bin, so that the scanning area of lasers on a forming surface rotates relative to the forming surface. Particularly, a rotary device capable of enabling the galvanometer to rotate around the center axis of the forming bin is mounted at the bottom of the galvanometer, or a rotary assembly capable of enabling the forming bin to rotate around the center axis of the forming bin is mounted at the bottom of the forming bin. According to the single-galvanometer big-area additive manufacturing laser forming equipment and the forming method, the forming area of the laser forming equipment is four times that of traditional equipment through the single laser galvanometer, the technical problem that the single-light-source forming area of traditional additive manufacturing equipment is limited is solved, the complex coordination control process during work of a multi-laser-galvanometer system is avoided, and meanwhile the problem that forming of a spliced area fails is avoided. The number of core components of the equipment is small, and the development and manufacturing cost of the equipment is reduced.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a laser forming equipment and a forming method for large-scale additive manufacturing with a single vibrating mirror. Background technique [0002] Selective laser melting (also known as additive manufacturing or metal 3D printing) technology is a new processing method that has emerged in recent years. The raw materials used in this technology are powders of tens to hundreds of microns. During the molding process, Spread the powder evenly on the forming substrate through the powder supply mechanism and the powder spreading mechanism, and then use energy sources such as lasers to melt the powder in a specific geometric shape area on the surface to produce metallurgical bonding, and finally make the parts grow layer by layer to achieve three-dimensional molding. process. [0003] With the popularization and application of this technology, the demand for ...

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Problems solved by technology

[0004] The existing multi-galvanometer system technology still has the following technical defects or deficiencies: On the one hand, the segmentation of the three-dimensional model of the multi-laser SLM forming equipment is usually an average segmentation, but the solid area to be melted by the laser is not evenly distributed in space, such as It is full of thin-walled, curved columnar supports and other special-shaped structures, resulting in not only a huge difference in the area of ​​the solid part to be processed in each galvanometer scanning area, but also an extremely uneven distribution of the temperature field.

In addition, at the junction of adjacent galvanometer scanning areas, a splicing area of ​​a certain width is required. Due to the inconsistent scanning time of adjacent laser galvanometer scanning systems, the splicing area may have aggravated spheroidization effects or even processing failures. Therefore, multi-vibration How to efficiently coordinate the work of the mirror system has always been an urgent problem to be solved

In addition, optical components such as lasers and galvanometers are the most expensive in laser forming equipment, so the multi-galvanometer system directly doubles the cost of equipment

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