Filtrating device and filtrating method for metal 3D (Three-dimensional) printer

Abstract

The application discloses a filtrating device and a filtrating method for a metal 3D (Three-dimensional) printer. The device comprises the following components: an inert gas source (1), a filter (2),a metal 3D printer (3) and a vortex fan (4) which are communicated by adopting pipelines. The device also comprises a measuring instrument and a controller (5). According to the filtrating method, theinert gas source is taken as a protective medium in the processes of metal 3D printing and filtrating and de-dusting; an inerting agent is set in a filter to serve as a pre-coating, so that the riskof fire or even explosion during metal 3D printing and filtrating and de-dusting is reduced; in addition, the purified inert airflow can be directly returned to the metal 3D printer for recycling, andthereby high efficiency, stability, safety and reliability of the metal 3D printing process are ensured.

Description

technical field [0001] The invention relates to the field of filtration and purification, in particular to a filtration device and method for a metal 3D printer. Background technique [0002] Metal 3D printing uses metal powder as the printing material, and uses the high temperature of the laser beam to sinter the metal powder in a specific area according to the design model, so as to produce a product with a specific structure. Specifically, before the laser beam starts scanning, the powder spreading device first pushes the metal powder onto the substrate of the molding cylinder, and then the laser beam melts the metal powder on the substrate according to the filling contour of the current layer to process the current layer, and then The forming cylinder is lowered by a layer thickness, the powder cylinder is raised by a layer thickness, the powder spreading device spreads metal powder on the processed current layer, and the 3D printing equipment transfers the data of the n...

AI Technical Summary

Problems solved by technology

[0003] Due to the smoke generated during the metal powder sintering process, and the metal dust flying during the powder spreading process, the smoke in the processing room will affect the propagation of the laser beam, thereby reducing the accuracy of metal 3D printing and the quality of the workpiece, so , it is necessary to dedust and purify the inert gas in the processing chamber

The simplest method is to continuously feed clean inert gas into the processing chamber and discharge the dusty gas out of the processing chamber. However, the dusty gas in the processing chamber not only contains the smoke generated by laser sintering, but also contains unreacted metal powder. , due to the high chemical activity of metal powder, it is easy to cause fire or explosion after reaching a certain concentration in the air. Moreover, high-purity inert gas is expensive, and the smoke and dust collected in the metal 3D printing process are flammable and explosive. It is easy to burn or explode when in contact with the outside air. If the dusty gas in the processing room is discharged directly into the atmosphere, it will not only increase the cost of using inert gas, but also cause serious environmental pollution and great safety hazards.

[0004] Traditional dust and gas purification devices are mainly divided into two types: wet filter device and dry filter device. The wet filter device has a simple structure and low price, but the capture efficiency of the wet filter device is low. The purified gas is due to changes in humidity and Factors such as high dust concentration cannot be recycled, so they can only be used in small metal 3D printers in some laboratories, which cannot meet the needs of large-scale industrial production; conventional dry filtration devices such as filter bags or filter cartridges, purification The dust concentration of the finished gas is generally 10mg / m 3 Above, for metal 3D printing equipment, the dust concentration is still too high, which will affect the working stability, service life and quality of printed products of metal 3D printing equipment

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