Selected region laser sintering and molding method of ultrahigh molecular weight polyethylene

A selective laser sintering and ultra-high molecular weight technology, which is applied in ceramic molding machines, manufacturing tools, additive processing, etc., to achieve the effect of high dimensional accuracy and small deformation and shrinkage

Active Publication Date: 2015-12-23
安徽隆源成型科技有限公司
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Problems solved by technology

[0004] However, although UHMWPE is used in medical treatment, most of them are standard parts produced by the traditional mold method, and the prior art of using UHMWPE to prepare personalized medical parts does not involve

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  • Selected region laser sintering and molding method of ultrahigh molecular weight polyethylene
  • Selected region laser sintering and molding method of ultrahigh molecular weight polyethylene
  • Selected region laser sintering and molding method of ultrahigh molecular weight polyethylene

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Embodiment Construction

[0031] The present invention will be further described below with reference to the accompanying drawings and in combination with preferred embodiments.

[0032] UHMWPE is a crystalline polymer material with a molecular weight of more than one million, poor fluidity of processed melt, high viscosity, and large shrinkage and deformation after molding. These all limit the application of SLS molding of UHMWPE. The inventor analyzed the factors that affect UHMWPE. After many factors of SLS molding, the following technical solutions are obtained. In a specific embodiment, a selective laser sintering molding method of ultra-high molecular weight polyethylene includes the following steps:

[0033] (1) heating the ultra-high molecular weight polyethylene powder to the preheating temperature in the selective laser sintering molding equipment;

[0034] (2) Using a predetermined laser scanning speed and output power to form the ultra-high molecular weight polyethylene powder in a selectiv...

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Abstract

The invention discloses a selected region laser sintering and molding method of ultrahigh molecular weight polyethylene. The selected region laser sintering and molding method comprises the following steps: (1) heating ultrahigh molecular weight polyethylene powder in selected region laser sintering and molding equipment to a pre-heated temperature; (2) molding the ultrahigh molecular weight polyethylene powder in the selected region laser sintering and molding equipment by adopting pre-set laser scanning speed and output power to obtain a molded piece; and (3) taking out the molded piece and keeping the heat at a temprature of 110-130 DEG C for 8-12 hours, and then cooling to obtain a molded part of the ultrahigh molecular weight polyethylene. The molded part of the ultrahigh molecular weight polyethylene, molded by the method disclosed by the invention, has relatively high mechanical property and size precision, has small transformation shrinkage and is particularly suitable for manufacturing medical auxiliary tools.

Description

technical field [0001] The invention belongs to the technical field of 3D printing and molding, and in particular relates to an area-selective laser sintering molding method of ultra-high molecular weight polyethylene. Background technique [0002] Selective Laser Sintering (Selective Laser Sintering, referred to as SLS, also known as Selective Laser Sintering), as one of the mainstream 3D printing technologies, was first invented and patented by Dr. (acquired by 3DSystems) for commercialization. SLS uses powder materials as raw materials, lasers as heat sources, and adopts the principle of layering-superposition to directly manufacture three-dimensional entities from CAD models. The process parameters of this technology mainly include: laser power, scanning speed and spacing, preheating temperature and layer thickness. The advantage of SLS lies in the wide selection of raw materials, which can be various powder materials such as polymers, ceramics, and sand. Compared wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C67/04B28B1/00B33Y10/00
Inventor 李子夫程明赵君杰侯璟崑
Owner 安徽隆源成型科技有限公司
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