A powder supply and powder spreading mechanism for a laser sintering 3D printer

Abstract

The invention discloses a powder supply and spreading mechanism, comprising a powder supply cylinder, a level detector, a cylinder, a workbench, a power device, a guide rail, a frame, a powder supply and spread cover, and a screw powder supply mechanism. The powder cover is a cylindrical ring whose length is consistent with the length of the workbench; a powder outlet sieve is provided on any 1 / 4 circumference of the powder supply and spread powder cover, and the remaining 3 / 4 circumference is used as a scraper; The powder outlet sieve is provided with tiny powder outlet holes; the screw powder feeding mechanism is arranged in the powder supply and spreading sleeve. The powder supply and spreading mechanism proposed by the present invention combines scraping and spreading together, and scrapes while spreading the powder, so as to realize the improvement of efficiency; the screw powder feeding mechanism is used to send the powder from one end of the powder supply and spreading sleeve to the other end , to achieve uniform powder delivery and improve the quality of powder spreading.

Description

technical field

[0001] The invention relates to the technical field of 3D printing, in particular to a powder supply and spreading mechanism of a laser sintering 3D printer. Background technique

[0002] At present, laser sintering technology has increasingly become a research hotspot. The process of 3D printing processing parts is to spread a certain amount of powder on the workbench, and then use the scraper to level the powder, and then the laser head will sinter the current layer of powder. Powder, continue to scrape flat, repeat this process, get shaped parts.

[0003] The purpose of laser sintering technology is to obtain parts with high molding quality, and the quality of powder coating largely determines the molding quality. Therefore, if the quality of powder coating is not high, such as uneven powder, containing pores, etc., the parts after processing will have Pores and other defects. Most of the powder spreading and scraping devices and methods in the prior ar...

Examples

Embodiment 1

[0037] refer to Figure 1 to Figure 3 , a powder supply and spreading mechanism for a laser sintering 3D printer, comprising a control system 1, a powder supply cylinder 2, a level detector 7, a cylinder 3, a workbench 8, a guide rail 12 and a powder spreading and leveling mechanism 13.

[0038] In the present embodiment, the powder spreading and scraping mechanism 13 includes a frame 4, a first power unit 5, a second power unit 9, a powder supply and powder spreading cover 6, a powder outlet screen 14 and a screw powder feeding mechanism 15; The powder supply cover 6 is a cylindrical ring, and its length is consistent with the length of the workbench.

[0039] Any 1 / 4 circumference of the powder supply and spreading cover 6 is provided with a powder outlet sieve 14, and its remaining 3 / 4 circumference is used as a scraper for scraping the powder on the workbench 8; In the powder supply and spreading set 6 , the powder outlet sieve 14 is evenly spread on the workbench, and th...

Embodiment 2

[0052] The difference between this embodiment and Example 1 is that the diameter of the powder outlet holes on the powder outlet sieve is 70um, the number of powder outlet holes on the powder outlet sieve is 2300, and the screw powder feeding mechanism and the powder outlet The gap between the insides of the powder supply and powder sets is 0.2mm; the purpose of this design is to adapt to the particle size of the powder. If the particle size of the powder is below 70um, the powder outlet sieve will filter the powder with a diameter greater than 70um, because in 3D printing Among them, the diameter of the powder that does not meet the requirements will reduce the printing quality; the powder output can be adjusted to adapt to the small area of ​​the workbench and improve the efficiency of powder supply.

[0053] The working mode and other structures and connection modes of this embodiment are the same as those in Embodiment 1.

Embodiment 3

[0055] The difference between this embodiment and embodiment 1 is that the diameter of the powder outlet holes on the powder outlet sieve is 120um, the number of powder outlet holes on the powder outlet sieve is 546, and the screw powder feeding mechanism and the powder outlet The gap between the insides of the powder supply and powder sets is 0.1mm; its purpose is consistent with that described in Example 3, that is, if the particle size of the powder is below 120um, the powder outlet sieve will filter powders with a diameter greater than 120um, because in 3D printing , The diameter of the powder that does not meet the requirements will reduce the printing quality; the powder output can be adjusted to adapt to a large-area workbench and improve the efficiency of powder supply.

[0056] The working mode and other structures and connection modes of this embodiment are the same as those in Embodiment 1.

technical field

[0001] The invention relates to the technical field of 3D printing, in particular to a powder supply and spreading mechanism of a laser sintering 3D printer. Background technique

[0002] At present, laser sintering technology has increasingly become a research hotspot. The process of 3D printing processing parts is to spread a certain amount of powder on the workbench, and then use the scraper to level the powder, and then the laser head will sinter the current layer of powder. Powder, continue to scrape flat, repeat this process, get shaped parts.

[0003] The purpose of laser sintering technology is to obtain parts with high molding quality, and the quality of powder coating largely determines the molding quality. Therefore, if the quality of powder coating is not high, such as uneven powder, containing pores, etc., the parts after processing will have Pores and other defects. Most of the powder spreading and scraping devices and methods in the prior ar...

Examples

Embodiment 1

[0037] refer to Figure 1 to Figure 3 , a powder supply and spreading mechanism for a laser sintering 3D printer, comprising a control system 1, a powder supply cylinder 2, a level detector 7, a cylinder 3, a workbench 8, a guide rail 12 and a powder spreading and leveling mechanism 13.

[0038] In the present embodiment, the powder spreading and scraping mechanism 13 includes a frame 4, a first power unit 5, a second power unit 9, a powder supply and powder spreading cover 6, a powder outlet screen 14 and a screw powder feeding mechanism 15; The powder supply cover 6 is a cylindrical ring, and its length is consistent with the length of the workbench.

[0039] Any 1 / 4 circumference of the powder supply and spreading cover 6 is provided with a powder outlet sieve 14, and its remaining 3 / 4 circumference is used as a scraper for scraping the powder on the workbench 8; In the powder supply and spreading set 6 , the powder outlet sieve 14 is evenly spread on the workbench, and th...

Embodiment 2

[0052] The difference between this embodiment and Example 1 is that the diameter of the powder outlet holes on the powder outlet sieve is 70um, the number of powder outlet holes on the powder outlet sieve is 2300, and the screw powder feeding mechanism and the powder outlet The gap between the insides of the powder supply and powder sets is 0.2mm; the purpose of this design is to adapt to the particle size of the powder. If the particle size of the powder is below 70um, the powder outlet sieve will filter the powder with a diameter greater than 70um, because in 3D printing Among them, the diameter of the powder that does not meet the requirements will reduce the printing quality; the powder output can be adjusted to adapt to the small area of ​​the workbench and improve the efficiency of powder supply.

[0053] The working mode and other structures and connection modes of this embodiment are the same as those in Embodiment 1.

Embodiment 3

[0055] The difference between this embodiment and embodiment 1 is that the diameter of the powder outlet holes on the powder outlet sieve is 120um, the number of powder outlet holes on the powder outlet sieve is 546, and the screw powder feeding mechanism and the powder outlet The gap between the insides of the powder supply and powder sets is 0.1mm; its purpose is consistent with that described in Example 3, that is, if the particle size of the powder is below 120um, the powder outlet sieve will filter powders with a diameter greater than 120um, because in 3D printing , The diameter of the powder that does not meet the requirements will reduce the printing quality; the powder output can be adjusted to adapt to a large-area workbench and improve the efficiency of powder supply.

[0056] The working mode and other structures and connection modes of this embodiment are the same as those in Embodiment 1.

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