Validated Simulation of the Ultrasonic Wire Bonding Process (bibtex)
by , , , , , , , , ,
Abstract:
To increase quality and reliability of copper wire bonds, self-optimization is a promising technique. For the implementation of self-optimization for ultrasonic heavy copper wire bonding machines, a model of stick-slip motion between tool and wire and between wire and substrate during the bonding process is essential. Investigations confirm that both of these contacts do indeed show stick-slip movement in each period oscillation. In a first step, this paper shows the importance of modeling the stick-slip effect by determining, monitoring and analyzing amplitudes and phase angles of tooltip, wire and substrate experimentally during bonding via laser measurements. In a second step, the paper presents a dynamic model which has been parameterized using an iterative numerical parameter identification method. This model includes Archard’s wear approach in order to compute the lost volume of tool tip due to wear over the entire process time. A validation of the model by comparing measured and calculated amplitudes of tool tip and wire reveals high model quality. Then it is then possible to calculate the lifetime of the tool for different process parameters, i.e. values of normal force and ultrasonic voltage.
Reference:
Unger, A.; Schemmel, R.; Meyer, T.; Eacock, F.; Eichwald, P.; Althoff, S.; Sextro, W.; Brökelmann, M.; Hunstig, M.; Guth, K.: Validated Simulation of the Ultrasonic Wire Bonding Process. Wear Modeling in Copper Wire Wedge Bonding. IEEE CPMT Symposium Japan, 2016, 2016. (Preprint: http://www.tobi-meyer.de/Unger2016.pdf)
Bibtex Entry:
@INPROCEEDINGS{Unger2016,
  howpublished = {Conference Proceedings},
  author = {Unger, Andreas AND Schemmel, Reinhard AND Meyer, Tobias AND Eacock, Florian AND Eichwald,
	Paul AND Althoff, Simon AND Sextro, Walter AND Brökelmann, Michael AND Hunstig,
	Matthias AND Guth, Karsten},
  title = {Validated Simulation of the Ultrasonic Wire Bonding Process},
  booktitle = {Wear Modeling in Copper Wire Wedge Bonding. IEEE CPMT Symposium Japan,
	2016},
  year = {2016},
  pages = {251-254},
  address = {IEEE CPMT Symposium Japan},
  abstract = {To increase quality and reliability of copper wire bonds, self-optimization
	is a promising technique. For the implementation of self-optimization
	for ultrasonic heavy copper wire bonding machines, a model of stick-slip
	motion between tool and wire and between wire and substrate during
	the bonding process is essential. Investigations confirm that both
	of these contacts do indeed show stick-slip movement in each period
	oscillation. In a first step, this paper shows the importance of
	modeling the stick-slip effect by determining, monitoring and analyzing
	amplitudes and phase angles of tooltip, wire and substrate experimentally
	during bonding via laser measurements. In a second step, the paper
	presents a dynamic model which has been parameterized using an iterative
	numerical parameter identification method. This model includes Archard’s
	wear approach in order to compute the lost volume of tool tip due
	to wear over the entire process time. A validation of the model by
	comparing measured and calculated amplitudes of tool tip and wire
	reveals high model quality. Then it is then possible to calculate
	the lifetime of the tool for different process parameters, i.e. values
	of normal force and ultrasonic voltage.},
  comment = {Preprint: \url{http://www.tobi-meyer.de/Unger2016.pdf}},
  keywords = {the Ultrasonic Wire Bonding Process}
}
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