---
res:
  bibo_abstract:
  - 'Wire bonding is the most common technology for connecting electronic components.
    Due to their efficiency bond interconnections made of copper wire are used for
    example in the aerospace and medical technology as well as in the fields of renewable
    energies. One of the main cost factors in the manufacturing process is the consumables
    like bonding tools. The technological transition to copper as wire material causes
    significant wear on the millimeter large effective contact area of the bonding
    tool. This wear leads to a loss by a factor of 30 of the number of reliable interconnections
    which can be produced by a single tool. To reduce setting-up time in the production
    and minimizing costs, an enlarged bonding tool lifetime is desirable. Consequently
    a better understanding of wear and recognition of wear pattern is required. Therefore,
    the paper presents an analyzing method of the tool topography change of a heavy
    wire bonding tool by using a confocal microscope. Furthermore, the paper discusses
    the identification of the main wear indicators by the help of the named topography
    change for different bond parameters, like ultrasonic power and tool geometry.
    Reference topography has been carried out by choosing typical parameters of the
    production line. To judge whether the quality requirement of the bond connections
    made by a single tool cannot be fulfilled shear test of the source bond have been
    carried out after a defined number of produced bond connections. Main steps of
    analysis: (I)Topography of the tool surface is sampled after a defined number
    of bonds by means of a confocal microscope to detect the wear progress.(II)The
    recorded data is filtered using Matlab. So, measurement errors can be eliminated
    and the topography can be overlaid more easy to identify differences between diverse
    tools or differences in wear stages of the same tool.(III)The subsequent discretization
    of the topography into sub volumes allows to (IV)describe the loss of volume depending
    on the position in the groove. Thereby, intermediate status of wear of one tool
    can be used to obtain a persistent description of the topography change over the
    number of produced bonds by interpolating the confocal data. Afterwards the persistent
    change of the groove flank has been analyzed for the named test series to identify
    the main wear indicators and their effect on shear forces. All worn tools show
    dominant areas for volume loss especially for plastic deformation and accordingly
    abrasion. These wear mechanism can be referred to the change of main parts of
    the groove geometry like the rounding of the front and back radius. The most volume
    loss was identified in the upper part of the tool flanks or rather at the transition
    from the groove flank to the front or back radius. Furthermore the observation
    of the center of the groove flank shows just a little change in volume. All in
    all, the identification of the wear indicators will be discussed with the objective
    of increasing the tool lifetime by optimizing the tool geometry without losses
    in bond quality and reliability.@eng'
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Paul
      foaf_name: Eichwald, Paul
      foaf_surname: Eichwald
  - foaf_Person:
      foaf_givenName: Walter
      foaf_name: Sextro, Walter
      foaf_surname: Sextro
      foaf_workInfoHomepage: http://www.librecat.org/personId=21220
  - foaf_Person:
      foaf_givenName: Simon
      foaf_name: Althof, Simon
      foaf_surname: Althof
  - foaf_Person:
      foaf_givenName: Florian
      foaf_name: Eacock, Florian
      foaf_surname: Eacock
  - foaf_Person:
      foaf_givenName: Andreas
      foaf_name: Unger, Andreas
      foaf_surname: Unger
  - foaf_Person:
      foaf_givenName: Tobias
      foaf_name: Meyer, Tobias
      foaf_surname: Meyer
  - foaf_Person:
      foaf_givenName: Karsten
      foaf_name: Guth, Karsten
      foaf_surname: Guth
  bibo_doi: 10.4071/isom-THP34
  dct_date: 2014^xs_gYear
  dct_language: eng
  dct_subject:
  - wedge/wedge bonding
  - copper wire
  - tool wear
  dct_title: Analysis Method of Tool Topography Change and Identification of Wear
    Indicators for Heavy Copper Wire Wedge Bonding@
...