The application of scanning electron microscope and melt flow index for orange peel in laser sintering process
The application of scanning electron microscope and melt flow index for orange peel in laser sintering process
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扫描电镜和橘皮熔体流动指数在激光烧结过程中的应用
DOI：
10.11591/ijeecs.v6.i3.pp615-622
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发表时间：
2017
影响因子：
--
通讯作者：
W. Yusoff
中科院分区：
文献类型：
--
作者：
W. Yusoff
在制造业中，许多产品需要进行越来越多的定制，并缩短制造周期。这使得生产原型所需的时间成为产品开发周期中最重要的因素之一。快速成型（RP）为用户提供了优化零件设计的能力，以满足客户的要求，几乎没有制造限制。最常见的RP工艺之一是激光烧结（LS）。LS的一个问题是，有时生产的零件表面显示出类似于橙子皮的纹理（所谓的“橙子皮”纹理）。在该技术获得更广泛的接受之前，必须解决这个问题。本研究的主要目的是开发一种控制输入材料特性的方法，以确保制造零件的一致性和良好质量。通过实验发现，高熔体流动速率、低熔融温度、低玻璃化转变温度和低结晶温度的PA12粉末可以改善烧结过程，生产出收缩率较低的良好激光烧结（LS）件。具有较高熔体粘度和较低熔融热的粉末更容易变成液体，因此由于较短的链分子结构，在烧结过程中流动性更好。实验结果表明，熔体粘度与零件表面光洁度之间存在着一定的相关性.
In manufacturing, many products need to undergo increasing customisation, and a shortening of the manufacturing cycle time. This makes the time needed to produce prototypes one of the most important contributors to product development cycles. Rapid Prototyping (RP) offers the user the ability to optimise part design in order to meet customer requirements with few manufacturing restrictions. One of the most common RP processes is Laser Sintering (LS). A problem with LS is that sometimes the surface of the parts produced displays a texture similar to that of the skin of an orange (the so-called “orange peel” texture). This problem must be addressed before the technology can gain wider acceptance. The main aim of this research is to develop a methodology of controlling the input material properties that will ensure consistent and good quality of the fabricated parts. From the experiment, it was found that PA12 powder with high melt flow rate, low melting temperature, low glass transition temperature and low degree of crystallization temperature could improve the sintering process to produce a good Laser Sintering (LS) parts with lower shrinkage rate. The powder which has higher melt viscosity and lower melting heat becomes liquid more easily and therefore flows better during the sintering process due to a shorter chain molecular structure. The results of experimental work indicate that the melt viscosity, and part surface finish are correlated.