Device of powder bed for laser additive manufacturing

Abstract

The invention relates to a device of a powder bed for laser additive manufacturing and belongs to the related field of additive manufacturing. The device comprises a forming cylinder, a powder supplybox, an electric heating substrate, an electric control system and a gas protecting hood and the like. A plunger is arranged in the forming cylinder, and the plunger is driven by a screw and controlled by a motor to move up and down in the forming cylinder; the powder supply box is placed on a working platform of the forming cylinder and is driven by the screw and controlled by the motor to reciprocate linearly on the working platform of the forming cylinder; the electric heating substrate is placed on the plunger of the forming cylinder, is heated by means of a heating temperature controllerand regulates the temperature; the gas protecting hood is located on the working platform; the forming cylinder, the powder supply box and the electric heating substrate are placed in the protecting hood; and protecting gas is introduced through an air inlet to prevent air from polluting raw material powder and processed parts. The device provided by the invention integrates the powder supply boxwith a scraper blade, is simple in structure, and compacts a raw material powder paved layer by means of gravity; the electric heating substrate can control the temperature, so that the process parameters of laser additive manufacturing are optimized favorably and the quality and the production efficiency of the laser additive manufacturing are improved.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and in particular relates to a powder bed device for laser additive manufacturing. Background technique [0002] Traditional subtractive manufacturing uses molds, turning, milling and other mechanical processing methods to shape, cut, and remove raw materials to form final products, resulting in a great waste of materials and processing energy, which runs counter to the current concept of economical development. At present, with the rapid development of high-energy beam equipment such as electron beams and lasers and CAD three-dimensional drawing and slicing software, additive manufacturing has become a new type of part manufacturing process with its simple manufacturing process, especially for the manufacture of complex-shaped parts. . [0003] Powder bed powder spreading is a common process for additive manufacturing. The specific steps are as follows: use 3D graphics software to design t...

AI Technical Summary

Problems solved by technology

[0004] Most of the existing powder beds for laser additive manufacturing use a forming cylinder, a powder supply cylinder and a scraper. After the powder supply cylinder rises, the scraper scrapes the powder into the forming cylinder. Moreover, the compaction effect on the powder is poor, which affects the compactness of the formed parts

In addition, the traditional powder bed has no preheating function, and only depends on changing the laser energy and scanning speed to adjust the heat input, which is not conducive to taking into account the forming, metallurgical quality and production efficiency

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