Bhatti, M. Tarique L (1991) Effectiveness of computer controlled robotic precision manipulator. PhD thesis, Dublin City University.
Abstract
A robotic precision manipulator has been designed and
interfaced with a micro-computer for the manipulation of a
workpiece in such a way that 2-D/3-D complex shaped
surfaces may be produced using a wire EDM machine in which
the cutting forces are relatively negligible.
The manipulator is operated by four AC servo motors,
two of them are for the linear manipulation along the X and
Y axes and the other two motors are used for the
manipulation of the rotary motions, alpha and beta around
the X and Y axes respectively. The maximum X and Y axes
linear travel for the manipulator is 100 mm and 120 mm
respectively, and the angular cutting facility for alpha
and beta is 70° and 65° respectively. For carrying out the
tests on model material (polystyrene) for the simulated
WEDM process a wire cutting unit was also designed, and
commissioned on which the cutting wire and a micro-switch
is housed.
The interfacing system used for this manipulator has
two PC23 indexers and four KS-drives. One PC23 indexer
controls three motors and the other controls the fourth
motor. There are approximately 80 PC23 commands which can
be used for setting the process operating modes and motion
parameters. There are approximately 40 KS-dnve commands
for setting the servo conditions on the KS-dnve for system
optimisation and to match the operating conditions
described for the PC23 indexer. Other additional
facilities offered by the interface system were also
utilized by designing the programmable voltage regulator
(PVR) circuit to change the voltage in the cutting wire
through the micro-computer based software during the
generation of the shape. The micro-switch on the cutting
wire unit is installed and connected with the PC23 indexer
to check if the wire cutting rate is less than the
workpiece feedrate so that a signal can be sent to the
computer for retracing the workpiece cutting path.
A number of programs were developed to generate
different 2-D/3-D complex shapes using the model material.
The software developed, describes the shape geometry sizes, workpiece feedrate and voltage allowed to the cutting wire on user’s choice.
The effectiveness of the manipulator, interfacing system and software was studied qualitatively and quantitatively and was found to be very satisfactory- For carrying out the tests on a real WEDM machine, the hardware and software will need to be modified.
The commercially available WEDM machines cost over one
hundred thousand pounds with angular cutting facility of
±30° only at 12 mm thick workpiece. The present robotic
precision manipulator offers greater angular cutting
flexibility of up to ±70° at 50 mm thick workpiece with
around 25% cost of these commercially available WEDM
machines. The components which are not possible to be
manufactured using these costly WEDM machines can easily be
manufactured by using this robotic precision manipulator.
Metadata
Item Type: | Thesis (PhD) |
---|---|
Date of Award: | 1991 |
Refereed: | No |
Additional Information: | Appendices (Vol. II) are missing for this thesis |
Supervisor(s): | Hashmi, Saleem |
Uncontrolled Keywords: | Robotics |
Subjects: | Engineering > Mechanical engineering |
DCU Faculties and Centres: | DCU Faculties and Schools > Faculty of Engineering and Computing > School of Mechanical and Manufacturing Engineering |
Use License: | This item is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 License. View License |
ID Code: | 18336 |
Deposited On: | 15 May 2014 13:04 by Celine Campbell . Last Modified 15 May 2014 13:04 |
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