A metal powder 3d printer

Abstract

The invention relates to a metal powder 3D printer, which belongs to the field of 3D printing equipment, and provides a metal powder 3D printer with reasonable structural design, convenient operation, good powder spreading quality, uniform powder preheating, greatly shortened part processing time, and easy handling of formed parts. It is convenient and can realize automatic powder adding operation, which saves a lot of manpower and material resources, and prevents the operator from inhaling a large amount of powder metal powder 3D printer. The technical solution adopted is to install the first electric push rod inside the powder outlet sleeve, and install A lifting device is installed on the inner side of the positioning plate, and a cone hole, a shielding plate, a ejector rod and a guide tube connected to the cone hole are set on the lifting plate to realize powder suction around the parts, and an electric heating tube is set on the inner side of the upper end of the powder outlet sleeve to clean the powder. Carry out preheating, install the anti-sticking part on the powder spreading roller, install the sealing cover on the operation panel, and set the feeding sleeve, the telescopic sleeve and the feeding screw on the upper end of the sealing cover to realize the feeding operation.

Description

technical field [0001] The invention relates to the field of 3D printing equipment, in particular to a metal powder 3D printer. Background technique [0002] Selective laser sintering (SLS) technology is a kind of 3D printing technology. SLS uses laser to selectively sinter solid powder in layers, and makes the sintered solidified layers superimposed to form parts of the required shape. The whole process is as follows: when working, the powder cylinder piston (powder feeding piston) rises, and the powder spreading roller evenly spreads a layer of powder on the forming cylinder, and the computer controls the two-dimensional scanning trajectory of the laser beam according to the prototype slice model. The solid powder material is selectively sintered to form a layer of the part. After one layer is sintered, the piston of the forming cylinder is lowered by one layer thickness, and the powder spreading system spreads new powder, and the laser beam is controlled to scan and sint...

AI Technical Summary

Problems solved by technology

[0003] 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 the formed parts. When the powder is spread unevenly, it is easy to cause internal defects of the formed parts, thereby reducing product quality and even producing waste products. In the prior art, the powder is only spread on the forming cylinder through the powder spreading roller. However, when the powder spreading roller is moving, the metal powder at one end of the powder spreading roller will tend to move to both sides of the powder spreading roller, resulting in the lack of metal powder in the middle part of the forming cylinder, and during the movement and rolling process of the powder spreading roller There may be some powder sticking to the spreading roller, causing potholes on the spreading surface

②The preheating of the formed powder takes a long time, which increases a lot of processing time. There are two main heat sources for the preheating of the powder during the powder spreading process. Powder preheating

The existing technology is to preheat the new powder through the preheating system after laying the new powder on the formed steel. Since the SLS forming is formed by superimposing layers of laser sintering, it will be preheated after each layer of new powder is laid. Thermal operation, making the molding time of the part greatly lengthened

③When the parts are processed, the parts need to be taken out from the forming cylinder. At this time, the upper part of the parts is covered with a large amount of powder. The staff needs to take out the parts and powder in the forming cylinder at the same time, and then remove the powder on the surface of the parts through the vacuum device , the operation is troublesome and consumes a lot of manpower and material resources

④In the existing equipment, when a part is processed, it is necessary to manually add powder to the printer, and when adding powder, it will cause a large amount of powder to fly, and the operator needs to wear a dust mask to operate, which not only consumes a lot of manpower, It will also affect the health of operators

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