Device and method for recovering residual powder on SLM molding substrates

Abstract

The invention relates to a device and a method for recovering residual powder on SLM molding substrates. The device comprises a working bin provided with a glove box inlet; the working bin communicates with a gas storage tank through an inert gas pipe; a rotating shaft with a fixture is arranged in the working bin; a powder guide surface inwards, downwards and aslant extending from the inner sidesurface of the working bin is arranged below the rotating shaft; a filter screen connected with an impurity collecting barrel is arranged in the lowest place of the powder guide surface; a powder collecting barrel is connected below the filter screen; the filter screen and the fixture are connected with a vibrator arranged outside the working bin; the side wall or the bottom surface of the powdercollecting barrel is connected with an intake port of an air blower through a gas circulating screen; and an exhaust port of the air blower communicates with the internal of the working bin above therotating shaft through a gas circulating pipe. The device can effectively recover the residual powder on substrates and parts, effectively maintains cleanness in the working bin, can prevent more lossof inert gas when the substrates and the parts are put in or taken out by multiple times, and effectively saves the production cost.

Description

technical field [0001] The invention relates to a powder recycling device and a recycling method, in particular to a device and a method for recycling residual powder on an SLM forming substrate. Background technique [0002] Additive manufacturing, also known as 3D printing, can form complex-shaped parts with high forming precision and save materials. It has the cost advantage of forming complex objects, can provide personalized customization services, simplifies the production process, and is energy-saving and environmentally friendly during the production process. At present, it has been widely used in aerospace, biomedical, military, construction, automobile, jewelry, mold and other industries. [0003] Selective laser melting (SLM) is a molding method of additive manufacturing. It uses laser light to irradiate the pre-spread metal powder. The powder melts one layer, the substrate is lowered by one layer, and then a layer of powder is spread. Melt one layer and build up...

AI Technical Summary

Problems solved by technology

However, none of them have been specifically studied in depth on residual powder recovery on substrates and molded parts after SLM molding.

Moreover, no matter it is gas jet purging or rotating vibration, the powder in the working chamber is easy to fly around, and once the powder sticks to the inner wall of the working chamber, it is difficult to clean up

Especially for parts and supports with complex internal and external structures, it is difficult to clean the residual powder well in the existing technology

Moreover, when the substrate and molded parts are put into or taken out of the working chamber for many times, a large amount of inert gas in the working chamber will be lost. Due to the high cost of the inert gas, when the substrate and molded parts are put in or out for many times , will result in a substantial increase in production costs

Images