激光束专家PRIMEShas launched a new laser scanner characterization device for use with selective laser melting (SLM) 3D printers.
这ScanFieldMonitor（SFM）被描述为任何和所有激光梁和激光扫描仪设备的多合一诊断产品，并授予用户确定有关其激光源的各种参数的功能。因此，独立设备旨在启用改进的流程优化和系统资格，使用户可以更好地校准其基于激光的3D打印机用于工业3D打印。
“在不到三秒钟的时间,SFM决定the most important production parameters,” explains Stephan Holesch, sales engineer at PRIMES. “With special measurement schemes, it is also possible to determine pincushion distortion, the merging of overlapping scan fields, the focus shift, and the laser switch-on and switch-off delay.”
SFM的激光扫描仪资格
根据Primes的说法，工业3D打印中的质量保证落后。与传统的激光焊接相反，在激光束的诊断技术是完善的，SLM 3D打印仍然很大程度上取决于打印机扫描系统的动力学。随着越来越多的制造商越来越多地将SLM整合到其工艺链中，需要复杂的激光扫描仪表征来设定质量标准并保证验证。
SFM以专利的激光表征方法运行，该方法利用刻有一系列10 - 15微米厚测量线的玻璃板。当用户在板上扫描激光束时，光电二极管测量每条雕刻线散射的光。该过程可用于确定SFM，苛性剂和场平面上的激光束路径。
这n, using the sampling rate of the integrated photodiode, the SFM is able to calculate the travel speed of the laser from the start to the end point of the path. From this, PRIMES’ proprietary algorithms can analyze several complex relations such as pincushion distortion, the merging of overlapping scanning fields, and even delays in laser activation and deactivation. Since data acquisition is completed in the time it takes to write the scanning vectors (a few milliseconds), the device is also suitable for time-resolved analyses such as thermal lens examination.
To precisely position a laser’s fusion track in the powder bed, it is crucial to synchronize the laser’s illumination sequence with the movement of the scanning mirror. Seeing as absolute positioning information is provided by the SFM, the instrument can ultimately be used to calibrate these two essential parameters.
What makes the SFM unique?
这key selling point of the SFM is its comprehensive nature, as it consolidates multiple measuring functions into one device. This makes the instrument scanner-agnostic, whereby it is able to characterize any laser-based scanning system thrown at it. This ultimately saves the user both time and costs, as the need for several capital investments is eliminated and the complexity of the workflow is significantly reduced.
With a frame measuring 80 x 80 x 100mm, the system is also compact enough to be placed anywhere in a printer’s build chamber. PRIMES has even added an ethernet interface along with a WLAN module, so the SFM can be controlled remotely from outside of the 3D printer. Unlike conventional beam diagnostic devices, the system is capable of analyzing the beam at full power, so measurements can be taken under actual operating conditions.
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Featured image shows the glass plate of the SFM. Photo via PRIMES.
