Abstract
Today, the forging industry is facing new challenges.
The day-to-day business is characterized by fluctuating order
quantities and the production of high numbers of variants.
Under this condition the tool logistics is gaining more
importance in order to minimize production downtimes
through guaranteeing high tool availability with minimal tool
costs. This paper presents an approach for a synchronisation
of tool supply processes to production requirements by
evaluation of the cause-effect interdependencies from tool life
quantity and tool stock level on production performance and
tool utilization. Therefore the developed simulation model and
its usage for an extensive simulation study is specified in this
paper. It presents the findings from the cause-effect analysis
and is subdivided into four sections. In the first section the tool
logistic is described by a typical tool loop in massive forging
industries which is confirmed by a survey in 27 German forging
companies. Elements of a tool loop and the influencing factors
are specified. From this, the objectives of tool logistics (e. g.
high tool availability and low tool stock level) are deduced in
the second section. For the quantification of objectives in tool
logistics basic key indicators are defined and described
mathematically. In the third section an ideal tool loop is defined
and associated key indicators, such as “Maximum production
output rate per tool” are calculated. The modular structure of
the simulation model and the experimental design for the
simulation study is described in section four. The simulation
study is carried out in order to describe cause-effect
interdependencies between influencing factors and objectives
(e. g. tool availability) in tool logistics. Therefore a one by one
factor study gives significant value ranges for fully factorial
experiments. This is used to analyze the effects of interactions
between influencing factors on the tool logistics objectives.
Finally the basic conclusions from the experimental simulation
study are described as well as the ongoing research which is
facing an approximation function, that enables to calculate tool
operating points.
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