Application of design of experiment and virtual experiment to leadframe downset problem

Pao Yue-kong Library Electronic Theses Database

Application of design of experiment and virtual experiment to leadframe downset problem

 

Author: Yu, Tsz-kit
Title: Application of design of experiment and virtual experiment to leadframe downset problem
Degree: M.Sc.
Year: 2001
Subject: Integrated circuits -- Design and construction
Finite element method
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Manufacturing Engineering
Pages: i, 5, 131 leaves : ill. (some col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1599596
URI: http://theses.lib.polyu.edu.hk/handle/200/2758
Abstract: This project demonstrates the approach on how to use finite element to do virtual experiment together with design of experiments (DOE). The proposed approach is demonstrated through a particular problem. In this study, downset problem of 64L QFP leadframe is chosen to illustrate the approach. A pilot simulation of a fictitious leadframe is done to testify the capability of the FEA software to model downset. Then pilot study on modeling 64L QFP downset is done and the simulation results are validated with experiment. The validated model is used as virtual prototype and full factorial design with 2 level is used in the experiment design. An empirical model is built from the virtual experiment downset results with curving fitting tool. The empirical model is describing the sensitivity of downset control parameters. And statistic testings on the effects of the control parameters were done. The results show that the effect of control parameter "die width compensation" is the least and not significant. All the control parameters: punch speed, punch depth compensation, die width compensation and type of pre-load spring have some degree of interaction with each other. An approximated model of the downset response is found. As there is a constant 30% difference between the simulated downset. value and the experimental downset value. The model can be adjusted to estimate the experimental downset depth value. To conclude, an application of design of experiments using virtual experiment technique to a particular leadfame downset is illustrated. The final results are encouraging because more detail answer is obtained compared with the present trial and error approach.

Files in this item

Files Size Format
b15995963.pdf 11.44Mb PDF
Copyright Undertaking
As a bona fide Library user, I declare that:
  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

     

Quick Search

Browse

More Information