AS ISO ASTM 52902:2021 – Additive manufacturing-Test artifacts —Geometric capability assessment of additive manufacturing systems
AS ISO ASTM 52902:2021 – Additive manufacturing-Test artifacts —Geometric capability assessment of additive manufacturing systems.
The primary characterization of the AM system obtained by this document is via geometric accuracy, surface finish and minimum feature sizes of the benchmarking test piece(s).
4.2 Comparing results from one machine
The test piece(s) can be built and measured [or example when the new machine is installed. The test piece(s) may be used to periodically evaluate the performance or diagnose a fault in one AM system, for example, after system maintenance or as defined by the requirements of a quality system.
The test piece(s) described in this test method may be used as a demonstration of capabilities for a contract between a buyer and seller of AM parts or AM systems.
Data from the measurements described in this document can be used to gauge the impact of new process parameters or material on the AM system performance.
Certain test geometries may be included with every build on a particular AM system to help establish performance traceability. Depending on the needs of the end user, not all test artifacts need to be built, and Individual test artifacts can be built separately if required.
5 General principles for producing artifacts
This clause outlines principles applicable for producing all of the test artifact gemetrles in this document. Reporting requirements are previewed in connection with the production steps in this clause, hut more details about recording and reporting can be found with the individual artifact descriptions given In Clause 7.
5.2 Need to use feedstock conforming to a material specilication
In order to ensure repeatable results, the use of a quality feedstock material is needed. A feedstock material specification should be selected or determined by the end user and the feedstock used for test artifact trials should match said specification. For example, the specification may include the particulate properties (particle size, size distribution, morphology) for powder feedstock, bulk properties (such as flow) and chemical properties (such as chemical composition and level of contamination). Although the details of the material specification shall not be disclosed (unless otherwise agreed between supplier and purchaser), it should be documented by the producer and reported with a unique alphanumeric designation as specified by ASTM F297l:2013, Annex Al, element “B”. For powder-based processes, the material specification should specifically address limitations of powder re-use and percent of virgin/re-used powder.
5.3 Need to undertake artifact building according to a documented process specification
The processing of the material in the AM system should be undertaken according to a documented process specification/manufacturing plan, as specified by ASTM F2971:2013, Annex Al, element “C”. This may be a proprietary internal standard or external standard (subject to buyer/seller negotiations), but the producer should document user-definable settings and conditions surrounding the bLailding of parts. For example, it should document the layer thickness, build strategies (e.g. scan path, tool path, and/or scan parameters), temperatures, etc. used during the build. This process should be consistent for all test artifacts produced within one build. These recommendations can be different for each use, so the parameters in the process specification should be agreed between the vendor and end user.
5.4 FIle formats and preparation
The file formats used and steps of the digital file preparation including slice parameters should be included in the process specification. Care shall be taken during the creation and transfer of data files to avoid degradation of the model.Any discrepancy between these affects the outcome of tests onthe artifacts and for this reason, best practice for the control of the file formats and preparation isdiscussed here.
5.5 Download files
The 3D digital models for standard test artifact geometries can be downloaded in *.step format athttps://standards .org/iso/52902/ed-1/en.For a complete list of available files, please see Annex D.
5.6 Discussion of file conversion.