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Device and method for improving strength of selective laser sintering 3D printing part

A 3D printing and laser sintering technology, applied in the direction of improving energy efficiency, process efficiency, additive processing, etc., can solve problems such as insufficient strength, difficulty in meeting industrial requirements, rough surface of finished products, etc., and achieve the effect of improving surface quality

Active Publication Date: 2015-07-22
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

[0004] At present, the powder material of selective laser sintering technology is loose. After laser sintering, the surface is still powdery and contains irregular holes, resulting in rough surface and insufficient strength of the finished product, which is difficult to meet industrial requirements.

Method used

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  • Device and method for improving strength of selective laser sintering 3D printing part

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Embodiment Construction

[0015] The present invention provides a device for improving the strength of selective laser sintering 3D printing parts, such as figure 1 As shown, it consists of a laser unit, a powder spreading unit, a compacting unit and a powder heating unit; the laser unit mainly includes CO 2 Laser transmitter 1 and scanning vibrating mirror 2; the powder spreading unit mainly includes powder 5, molding cylinder piston 7, powder cylinder piston 8 and powder spreading roller 9; the pressing unit includes a pressing stepping motor ( Not shown in the figure), lead screw 3, optical quartz glass panel 4; the heating unit includes a resistance heater and a thermocouple 10.

[0016] In a device for improving the strength of selective laser sintering 3D printing parts according to the present invention, CO 2 The laser emitter 1 emits an ultraviolet laser beam, which is reflected by the scanning vibrating mirror 2 to the surface of the powder layer on the piston 7 of the forming cylinder; the r...

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Abstract

The invention discloses a device and method for improving the strength of a selective laser sintering 3D printing part. The device mainly comprises a laser unit, a powder spreading unit, a pressing unit and a powder heating unit. A quartz glass panel in the same shape as a forming cylinder piston is placed over the forming cylinder piston in parallel and moves vertically through a stepping motor and ball screws. The quartz glass panel moves upwards by a certain distance every time after sintering of one layer is completed so that a powder spreading roller can pass through smoothly to perform the next time of powder spreading. The optical quartz glass panel can transmit lasers and also can apply pressing force to press powder, so that the situation that because pores exist in the powder, holes are formed inside the product after the sintering process and influence the strength of the product is avoided, and the surface quality of the product is improved. The surface of the topmost layer of the formed product does not make contact with the quartz glass panel so that the formed product will not adhere to the quartz glass panel. Or, after the spread powder is sintered, the quartz glass panel performs pressing and is moved away till the surface of the formed product is cooled and solidified, and then the formed product is taken out.

Description

technical field [0001] The invention relates to a mechanism in rapid prototyping equipment, in particular to a mechanism and method in SLS selective laser sintering 3D printing equipment. Background technique [0002] Rapid prototyping technology (also known as rapid prototyping manufacturing technology, Rapid Prototyping Manufacturing, referred to as RPM), also known as 3D printing. According to the three-dimensional model data of the object, the technology manufactures the entity in a layer-by-layer manner through the forming equipment, which can overcome the special structural obstacles that cannot be realized by traditional mechanical processing. Simplified production of arbitrary complex structural components can be realized. The existing 3D printing technologies are mainly divided into fused deposition modeling (FDM), selective laser sintering (SLS), stereolithography (SLA), and digital light processing (DLP). [0003] For selective laser sintering (SLS), the basic i...

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Application Information

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IPC IPC(8): B22F3/105B33Y30/00
CPCY02P10/25
Inventor 谭晶迟百宏阎华谢鹏程焦志伟丁玉梅杨卫民
Owner BEIJING UNIV OF CHEM TECH
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