Effect of mold compliance on dimensional variations of precision molded components in multi-cavity injection molding

Rasoul Mahshid, Yang Zhang, Hans Nørgaard Hansen, Alexander Henry Slocum

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Precision injection molding of high performance components requires primary error sources affected the molded component to be identified and isolated such that these errors can be reduced if needed. To systematically isolate and quantify the contribution of misalignment, thermal variation and component warpage to the accumulated error observed on the component, a methodology is presented and tested around an existing mold which produced parts with high dimensional variability. The mold featured two concentric guide pillars on opposite sides of the parting plane and rectangular centering block elements at three locations. Mold displacements at the parting plane were measured through the incorporation of three eddy-current linear displacement sensors. Thermal error sensitivity was investigated using FEM simulations such that the induced variability from thermal expansion and filling phase was identified and quantified. Finally, molded component warpage was isolated and quantified, again by the means of FEM simulation. The results were confirmed by using the mold on two injection molding machines to produce an array of parts whose key dimensions were measured.
Original languageEnglish
JournalJournal of Manufacturing Processes
Volume67
Pages (from-to)12-22
ISSN1526-6125
DOIs
Publication statusPublished - 2021

Keywords

  • Error source
  • Displacement sensor
  • Precision injection molding
  • Thermal error
  • Warpage
  • Mold misalignment

Fingerprint

Dive into the research topics of 'Effect of mold compliance on dimensional variations of precision molded components in multi-cavity injection molding'. Together they form a unique fingerprint.

Cite this