Elastic Die Technology for Spur Gear Powder Compaction: Experimental Measurements and Simulation-Based Validation
Dan Cristian Noveanu
TL;DR
A new elastic die system improves powder compaction for gears by reducing friction and ensuring uniform density.
Contribution
The study introduces an elastic die system that reduces ejection defects and improves density uniformity in spur gears.
Findings
Elastic die technology eliminates ejection friction in spur gear powder compaction.
Higher die pre-stressing strokes correlate with increased sintered density.
Finite element modeling validated stress distribution and predicted critical stress concentrations.
Abstract
Achieving high density in complex powder metallurgy components like spur gears is often hindered by friction-induced density gradients and ejection defects. This study investigates a novel elastic die system designed to mitigate these issues through controlled radial deformation. Spur gears were compacted using Ancorsteel 2000 powder under pressures of 400–700 MPa, utilizing a tapered elastic sleeve to apply radial compression. Green and sintered densities were measured, while porosity distribution was quantified via image analysis. Additionally, a 3D finite element simulation using FORGE software was conducted to model the thermo-mechanical behavior and stress distribution during the process. Experimental trials demonstrated that the elastic relaxation of the sleeve enabled free ejection of the compacts without requiring an extraction force. Image analysis confirmed a homogenous…
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Taxonomy
TopicsPowder Metallurgy Techniques and Materials · Metal Alloys Wear and Properties · Injection Molding Process and Properties