Powder material laser-sintering forming device

Abstract

The invention relates to a powder material laser-sintering forming device, belongs to the technical field of 3D printing additive manufacturing technologies and provides a powder material laser-sintering forming device which is simple to operate, high in powder spreading efficiency, good in powder spreading effect and wide in application range. The powder material laser-sintering forming device adopts the technical scheme that hydraulic oil cylinders are arranged in a material collecting cylinder, a forming cylinder and a powder supply cylinder; material pushing baffles are arranged on the hydraulic oil cylinders; powder spreading sliding rails are arranged in the middle of a forming cavity; a roller rack is mounted on the powder spreading sliding rails in a sliding way; a powder spreading roller is mounted on the roller rack; roller rack lead screws are arranged on the roller rack; preheating guide rails are arranged at the upper part of the forming cavity; a preheating housing is mounted on the preheating guide rails in a sliding way; preheating rods are arranged in the preheating housing; an infrared thermometer is arranged outside the preheating housing; a laser scanning system is arranged at the top of the forming cavity; and a gas intake and exhaust device is arranged on the side wall of the forming cavity. The powder material laser-sintering forming device is widely used for laser-sintering forming of powder material.

Description

technical field [0001] The invention relates to a powder material laser sintering forming device, which belongs to the technical field of 3D printing additive manufacturing. Background technique [0002] In recent years, 3D printing technology has set off a 3D printing boom in academia and industry with its unique advantages. 3D printing is based on the three-dimensional model, using polymer plastics, photosensitive resin, metal powder, film-coated powder and other materials as raw materials, and realizes the manufacture of three-dimensional models through the principle of layer-by-layer superposition of materials, integrating CAD, mechanical automation and other technologies , has the characteristics of rapidity, high flexibility, and high efficiency, and is especially suitable for manufacturing complex structural models in small batches. Its products have been used in automobile manufacturing, aerospace and other fields. [0003] Selective laser sintering (SLS) technology...

AI Technical Summary

Problems solved by technology

[0004] At present, in the SLS forming process, there are still the following problems to be solved: ① It is difficult to monitor the powder quality

The quality of powder spreading has an important influence on the quality of formed parts. When powder spreading is uneven, it is easy to cause internal defects of formed parts, thereby reducing product quality and even waste products

[0005] ② It is difficult to monitor whether the warping deformation of the formed part occurs during the forming process. During the forming process, when the part warps and deforms, if it cannot be found in time and the process parameters are adjusted in time, the degree of deformation will become more and more serious, resulting in forming failure

[0006] ③ The preheating of the formed powder is uneven and the accuracy of the preheating temperature is low. There are two main heat sources for the preheating of the powder during the powder spreading process. preheating

Due to the different sizes of the formed parts, the temperature distribution in different parts is different, and the preheating of the laid powder is not uniform

At the same time, it is difficult for the preheating system to compensate for the uneven preheating caused by the formed part itself to the laid powder, which eventually leads to uneven preheating of the formed powder and insufficient preheating temperature control accuracy, which affects the quality of the formed part, and even makes it difficult to form

[0007] ④ The gas protection system in the forming cavity has uneven air intake. During the forming process, some powders need to be protected by gas to prevent oxidation. However, during the SLS forming process, if the protective gas distribution in the forming cavity is uneven, the formed parts will be oxidized, thus Affect the quality of formed parts

[0008] ⑤Because of the above problems, it is difficult for one equipment to form different powders

The currently developed SLS forming equipment is mainly aimed at specific forming powders, and it is difficult to meet various powder forming requirements.

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