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不同成形工具的详细评估结果显示，滚轮成形在成形期间在引脚上产生比固体成形工艺小得多的应力。由固体成形引起的较高应力可能扩大造成引脚歪斜或移动的因素。另外，滚轮成形机制能够达到比固体成形机制更小的弯曲半径。固体成形与摆动凸轮滚轮成形机制的比较如图六所示。 图六、固体成形与摆动凸轮滚轮成形机制的比较
Kai-Fung Lau is engineering manager and Chi-Hung Leung is tooling design manager at ASM Assembly Automation, Post Encapsulation Product Group. For more information, contact Kai-Fung Lau at ASM, 6th Floor, Watson Center, Kung Yip Street, Kwai Chung, Hong Kong; 852-2619-2302; Fax: 852-2619-2129; E-mail: kflau@asmpt.com. Advanced Packaging June, 2001 |
