Calibration of shrinkage and beam offset in SLS process

Abstract

Selective laser sintering (SLS) is one of the most successful rapid tooling processes. Shrinkage and beam offset are the two most important control parameters in this process. First, the SLS process and procedure of calibration are described. Second, based on the property of shrinkage and beam offset, a basic formula of shrinkage and beam offset is derived. Finally, the procedure of applying shrinkage (scaling factor) and beam offset is described.

A review on measurement science needs for real-time control of additive manufacturing metal powder bed fusion processes

“…Further sintering behavior, mechanical properties, and microstructural features of the multicomponent iron-based powder were studied and presented [11]. Similar works based on laser beam offset were also reported in [12], [13].…”

Selective laser sintering: A qualitative and objective approach

“…In order to compensate for change in the size of the materials, the CAD model must be appropriately changed after calibration. 68 Scale factors …”

Behaviour Investigation of Plastic Parts Made from Selective Laser Sintering

“…How to construct SLS parts to get good shape accuracy of the end-use product? Accuracy de-pends strongly on shrinkage [9] during process-ing. Otherwise shrinkage is not uniform be-cause of thermal variations in the powder.…”