Design of automated disassembly process as an element of intelligent assembly cell.
Ruzarovsky, Roman ; Zvolensky, Radovan ; Velisek, Karol 等
1. INTRODUCTION
Creation and design of automated disassembly device is an complex
problem, which includes design problematic of automated device. Of
course automated device design problematic is consequently adjusted
following to the requirements of disassembly devices design problematic.
Such designing process, which is designing automated disassembly device
needs some guide. This guide will carry designer over the all problems
which are connected with disassembly process and also its automation.
After using of such guide, some automated disassembly device will be
designed. Such guide, or better say such tool is and methodology of
automated disassembly devices design.
2. METHODOLOGY OF AUTOMATED DISASSEMBLY DEVICE DESIGN
2.1 Disassembled product analysis
Input of most manufacturing of assembly technologies is analysis of
manufactured or assembled product. (Velisek & Katalinic, 2004). The
number of valuation views to the product and to disassembly device can
be different, usually the number depends on complexity or largeness of
whole disassembled block. Valuation views of disassembled product can be
divided in the five groups: disassembled element analysis according to the recycling kinds of single building products, disassembled elements
analysis according to its influence to the environment, disassembled
elements analysis according to the design materials of disassembled
products, disassembled elements analysis according to the using assembly
joints or according to the used assembly technologies, dimension and
shape analysis of single products, which are used during the whole
assembly process. Information which comes from these analyses are then
used for identification of parameters which are limiting the following
disassembly process.
2.2 Disassembly process design
For proper disassembly process design is necessary to know, the
process which was used by its assembly (Fig. 1.).
From that reason we use, as an input for disassembly process
design, assembly processes and other assembly documentation. If such
information and materials are not available it is necessary to create
own input data.
[FIGURE 1 OMITTED]
The tool which can be used for such input data creation is for
example step diagram, which is added by information taken from assembly
product joints analysis (Fig. 2.) (Javorova, A., 2008).
[FIGURE 2 OMITTED]
This way created assembly process can be later reworked by process
of creating of reverse step diagram (Fig. 3.). In case of more
complicated design, not only reverse step diagram can be used. This
solution needs, because of complicated and large design, the creation of
internal structure, which wills simple whole this kind created diagram.
[FIGURE 3 OMITTED]
Diagram doesn't includes logical branching and conditions,
which are needed for effective disassembly process. The reversed step
diagram have to be supplemented by conditions and rules on the ground of
Petri net theory (Brychta et al., 2008). This way created combinated
disassembly diagram offers more information which can be used for design
of automated disassembly device. This way created diagram also deals
about need of sensors equipment, also shows basic movements which are
needed for whole disassembly process and its also shows need of movement
actuators which will be needed for realization of whole disassembly
device. Diagram of this type was specially designed and created for
needs of automated disassembly devices design methodology and is also
combined by automated devices design problematic (Fig. 4.).
[FIGURE 4 OMITTED]
Diagram in this version can be used for whole disassembly process
description. It is also very important guide for design of whole
disassembly device.
3. AUTOMATED DISASSEMBLY DEVICE DESIGN
Methodology solves the automated disassembly device design in
several influenced levels. First two solution levels are the design of
elements which are creating the working space of whole device and design
of disassembly device manipulation device. As first one the problematic
of working space is solved. This problematic deals about the number and
also the character of manipulating and working places. Inputs, which are
needed for this problematic are reversed disassembly step diagram.
[FIGURE 5 OMITTED]
The output of workspace elements design is and creation of first
working space picture, which strongly influence to the following design
methodology of manipulating part of disassembly device. Design process
deals about design of power unit, design of clamping units, design
process of clamping jaws. On the ground of input analysis and step
diagrams are defined parameters of methodology: load, dimensions, power,
performance, man manipulating repieability, clamping dimensions e.g.
Information which are coming from these starting methodology activities
are also input data for other two activities: to the main frame and
control unit design of automated disassembly device. The both activites
are not influence one tho another. The end of whole automated
disassembly device design process is characterized by activity called
collision analysis that defines single zones created in the working
space of the device such as manipulating zone, working zone, non usable zone, and so on. This activity defines the intersections of these zones
and analyses possible collision stays (Mudrikova et al., 2008).
[FIGURE 6 OMITTED]
The next one activity of the design methodology is design of
control unit that includes: the design of control elements, processing
elements, storage elements, control elements and signal elements. Main
area of this activity is focused on the design of control algorithm of
automated disassembly device.
4. CONCLUSION
Designed methodology, step by step deals about single activities
and works. Realization of such activities is necessary for complex
design of automated disassembly device. Single steps are using known
analytical project methods which are modified following to the
disassembly devices problematic. But generally the methodology of
automated disassembly device design stand on the methods which were
specially created for needs of disassembly devices needs. Methodology
includes before project as well as project phases, which are followed by
design phases of whole automated disassembly device. (Zvolensky, R.
& Ruzarovsky, R., 2008). By connecting of updated well known methods
and specialized newly created methods a new methodology is created, and
it is able to create working automated disassembly device.
5. ACKNOWLEDGEMENTS
This paper was created thanks to the Slovak national grant: VEGA
1/0206/09--Intelligent assembly cell.
6. REFERENCES
Brychta, J.; Cep, R.; Novakova, J. & Petfkovska, L. (2007).
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Javorova, A. (2008). Computer aided design of automated assembly
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Mudrikova, A.; Hruskova, E. & Velisek, K. (2008) Flexible
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Zvolensky, R. & Ruzarovsky, R. (2008). Technological devices of
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