An investigation of tool wear in the dam-bar cutting of integrated circuit packages

✍ Scribed by C.F Cheung; W.B Lee; W.M Chiu

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 887 KB
• Volume: 237
• Category: Article
• ISSN: 0043-1648
• DOI: 10.1016/s0043-1648(99)00350-6

✦ Synopsis

Dam-bar cutting is a mechanical trimming process in which the dam-bar between the leads of an integrated circuit IC package after post-molding process and deflashing is pieced out. Premature wear of the dam-bar cutting tool leads to higher operating costs and loss of production. In this paper, an investigation has been made to study the effects of punch-die clearance, leadframe materials, tool materials, tool coatings, punch shear and cutting speed on the wear of dam-bar cutting tools. The relationships between the punch flank wear, burr height and the dam-bar cutting force are also explored. Hence, critical factors are determined to optimize the tool life and improve the quality of the dam-bar cutting process.