【国外标准】 Standard Practice for Additive Manufacturing — Powder Bed Fusion — Condition-Defined Maintenance for Optical Systems

4.1 The overall objective of this practice is to provide recommendations for the systematic acquisition of image data that indicate the health condition of the wear-sensitive SPW in PBF-LB/M machines. These data may allow a user to determine calibration and maintenance cycles based on the actual health condition of the SPW.4.2 The recommendations are intended for original equipment manufacturers (OEMs) of PBF-LB/M machines to provide guidance for the implementation of sensor systems to acquire spatially resolved data about the health condition of the SPW.4.3 The recommendations are intended for users of PBF-LB/M machines to provide guidance for the assessment of the actual health condition of the SPW to:4.3.1 Flag when a calibration or maintenance of the optical system is needed and alert the user or OEM to perform the calibration or maintenance and4.3.2 Generate statistical estimates for the useful life, or critical health state, of the SPW based on data recorded over the long term. The statistics may be used to derive maintenance cycles that allow a better utilization of the useful life of the SPW than current predetermined maintenance cycles.1.1 This practice provides:1.1.1 Recommendations for the design and integration of an area scan camera system (referred to as “camera system”) into a laser powder bed fusion (PBF-LB/M) machine to assess the health condition of the scanner protective window (SPW),1.1.2 Recommendations for data acquisition with the aforementioned system,1.1.3 Description of a methodology for processing the aforementioned data, and1.1.4 Recommendation on ex-situ measurements of laser beam parameters and part properties suitable for labeling of the processed condition data.1.2 Many of the operational descriptions included in this practice are intended as general overviews. They may not present the detailed information required.1.3 Units—The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.