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TECHNICAL PAPERS

Effect of Tool Wear on Force and Quality in Dam-Bar Cutting of Integrated Circuit Packages

[+] Author and Article Information
C. F. Cheung, W. B. Lee, W. M. Chiu

Department of Manufacturing Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong

J. Electron. Packag 123(1), 34-41 (Jul 06, 2000) (8 pages) doi:10.1115/1.1322564 History: Received July 06, 2000
Copyright © 2001 by ASME
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References

Figures

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A photograph of the single punch dam-bar cutting press
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Outline drawing for the single punch dam-bar cutting press
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Configuration of the experimental setup for the measurement of dam-bar cutting force
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Geometry of the dam-bar cutting tools
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Characteristics of flank wear of the dam-bar cutting punch
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Characteristics of face wear of the dam-bar cutting punch
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Appearance of dam-bar cutting punch (after 18,000 cutting cycles)
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Appearance of an excessively worn punch (after 42,300 cutting cycles)
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Dam-bar sheared edge produced by (a) a sharp punch and (b) an excessively worn punch, respectively
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Relationship between the average protrusion and number of dam-bar cutting cycles
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Characteristics of flank wear of dam-bar cutting die
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Characteristics of face wear of dam-bar cutting die
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Cutting edge conditions of the right half die after (a) 31,840 and (b) 150,000 cutting cycles, respectively
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Illustration of the wear of the dam-bar cutting die
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Cutting edge conditions of (a) the left half and (b) the right half die after 150,000 cutting cycles
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Relationship between the burr height and number of dam-bar cutting cycles
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Relationship between burr height and die flank wear
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Effect of die wear on die opening
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Effect of excessive die wear on the quality of dam-bar cutting
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Effect of punch wear on the peak dam-bar cutting force
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Effect of die wear on the peak dam-bar cutting force
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Geometry of dam-bar cutting process: (a) plane view and (b) cross-sectional view of sheared dam-bar edges
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A micrograph of the dam-bar viewed by SEM

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