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首页> 外文期刊>Journal of Manufacturing Processes >Laser sintering and invalidating composite scan for improving tensile strength and accuracy of SLS parts
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Laser sintering and invalidating composite scan for improving tensile strength and accuracy of SLS parts

机译：激光烧结和无效复合扫描，提高抗拉强度和SLS部件的精度

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摘要

The laser scanning method is one of the key factors in the process of selective laser sintering. Laser sintering and invalidating composite (LSIC) scanning method, which is composed of high tensile strength sintering scanning with large-spot and high accuracy invalidating scanning with small-spot, is able to improve the tensile strength, accuracy and fabrication efficiency of SLS parts. In this paper, the principle and implementation of this method were presented, and in order to prove the effectiveness of the method, the conventional scanning method was used to carry out the sintering forming experiments of the coated ceramics, and the relationship between the energy density, the tensile strength and accuracy of the parts was explored. Then based on the conclusion of this experiment, the composite scanning method is used for comparative sintering experiments. The results show that when the sintering process is carried out using the process parameters corresponding to the high tensile strength, a substantial amount of secondary sintered bodies is generated on the surface of the part and the accuracy is destroyed. The conventional scanning method cannot achieve high accuracy forming under this process condition. However, the composite scanning method can effectively eliminate the adverse influence of secondary sintering on accuracy, and achieve high tensile strength and high accuracy parts. Moreover, the method can also improve the fabrication efficiency. Therefore, this method is of great significance to realize high quality sand mould additive manufacturing and enrich the scanning method of SLS.
机译：激光扫描方法是选择性激光烧结过程中的关键因素之一。激光烧结和无效复合材料（LSIC）扫描方法，由具有小点和高精度无效的高抗拉强度烧结扫描，具有小点的扫描，能够提高SLS部件的拉伸强度，精度和制造效率。在本文中，提出了该方法的原理和实现，并且为了证明该方法的有效性，使用常规扫描方法进行涂布陶瓷的烧结成形实验，以及能量密度之间的关系，探索了零件的拉伸强度和准确性。然后基于该实验的结论，复合扫描方法用于比较烧结实验。结果表明，当使用对应于高抗拉强度的工艺参数进行烧结过程时，在部件的表面上产生大量的次级烧结体，并且精度被破坏。在该过程条件下，传统的扫描方法无法实现高精度。然而，复合扫描方法可以有效地消除二次烧结对精度的不利影响，并实现高抗拉强度和高精度部件。此外，该方法还可以提高制造效率。因此，该方法具有重要意义，以实现高质量的砂模添加剂制造，并丰富SLS的扫描方法。

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