Purpose

Scanning projection-based stereolithography (SPSL) is a powerful technology for additive manufacturing with high resolution as well as large building area. However, the surface quality of stitching boundary in an SPSL system has been rarely studied, and no positive settlement was proposed to address the poor stitching quality. This paper aims to propose an approach of multi-pass scanning and a compensation algorithm for multi-pass scanning process to address the issue of poor stitching quality in SPSL systems.

Design/methodology/approach

The process of multi-pass scanning is realized by scanning regions repeatedly, and the regions can be cured simultaneously because of the very short repeat exposure time and very fast scanning. Then, the poor stitching quality caused by the non-simultaneous curing can be eliminated. Also, a compensation algorithm is designed for multi-pass scanning to reduce the stitching errors. The validity of multi-pass scanning is verified by curing depth test, while the performance of multi-pass scanning as well as proposed compensation algorithm is demonstrated by comparing with that of a previous SPSL system.

Findings

The results lead to a conclusion that multi-pass scanning with its compensation algorithm is an effective approach to improve the stitching quality of an SPSL system.

Practical implications

This study can provide advice for researchers to achieve the satisfactory surface finish with SPSL technology.

Originality/value

The authors proposed a process of multi-pass scanning as well as a compensation algorithm for SPSL additive manufacturing (system to improve the stitching quality, which has rarely been studied in previous work.

中文翻译：

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多遍扫描投影立体光刻增材制造系统的设计与优化

目的

基于扫描投影的立体光刻（SPSL）是一项强大的技术，可用于高分辨率，大建筑面积的增材制造。但是，很少研究SPSL系统中的缝合边界的表面质量，并且没有提出积极的解决方案来解决较差的缝合质量。本文旨在提出一种多遍扫描方法和一种针对多遍扫描过程的补偿算法，以解决SPSL系统中拼接质量差的问题。

设计/方法/方法

多遍扫描的过程是通过重复扫描区域来实现的，并且由于非常短的重复曝光时间和非常快速的扫描，因此可以同时固化区域。然后，可以消除由于不同时固化而导致的不良缝合质量。此外，为多遍扫描设计了一种补偿算法，以减少拼接误差。通过固化深度测试验证了多次扫描的有效性，同时通过与以前的SPSL系统进行比较，证明了多次扫描的性能以及所提出的补偿算法。

发现

结果得出结论，多通道扫描及其补偿算法是提高SPSL系统拼接质量的有效方法。

实际影响

这项研究可以为研究人员使用SPSL技术获得令人满意的表面光洁度提供建议。

创意/价值

作者提出了多遍扫描过程以及SPSL增材制造的补偿算法（用于提高缝合质量的系统，这在以前的工作中很少进行研究。