Laser bending of leadframe materials

C. L. Yau, Kang Cheung Chan, Wing Bun Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

58 Citations (Scopus)

Abstract

Over the last decade, there have been numerous research works conducted on laser bending. However, less research effort has been spent on investigating the laser bending of thin sheets using a low power laser. In the present study, a low power Nd:YAG laser is used to experimentally examine the bending behaviour of a thin steel alloy strip which is now being used for integrated circuit leadframes. In the experiments, a machine vision system has been used to measure bending angles in a more accurate and efficient way. The experimental results show that the final bending angle in a multiple-irradiation laser bending process is related strongly to the laser power, the processing velocity, the number of irradiations and the holding time between each laser irradiation. A threshold line energy of about 0.14 J mm-1is observed, and a linear relationship between the bending angle and the line energy is found when the latter is below 1 J mm-1.
Original languageEnglish
Pages (from-to)117-121
Number of pages5
JournalJournal of Materials Processing Technology
Volume82
Issue number1-3
DOIs
Publication statusPublished - 1 Oct 1998

Keywords

  • Integrated circuit leadframes
  • Laser bending
  • Steel alloy

ASJC Scopus subject areas

  • Ceramics and Composites
  • Computer Science Applications
  • Metals and Alloys
  • Industrial and Manufacturing Engineering

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