Robust control applied to metal spraying for rapid tooling

Pathirana, Pubudu, Duncan, S and Jones, P. 2004, Robust control applied to metal spraying for rapid tooling, in Proceedings of the 5th Asian Control Conference : Melbourne, 20-23 July, 2004., ASCC, Melbourne, Australia, pp. 308-315.

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Title Robust control applied to metal spraying for rapid tooling
Author(s) Pathirana, Pubudu
Duncan, S
Jones, P.
Conference name Asian Control. Conference (5th : 2004 : Melbourne, Australia)
Conference location Melbourne, Vic.
Conference dates 20-23 July 2004
Title of proceedings Proceedings of the 5th Asian Control Conference : Melbourne, 20-23 July, 2004.
Editor(s) Cantoni, Michael
Publication date 2004
Conference series Asian Control Conference
Start page 308
End page 315
Publisher ASCC
Place of publication Melbourne, Australia
Keyword(s) automatic control
controllability
distributed parameter systems
forming processes
process control
control
Summary The spray forming process is a novel method of rapidly manufacturing tools and dies for stamping and injection operations. The process sprays molten tool steel from a set of arc spray guns onto a ceramic former to build up a thick steel shell. The volumetric contraction that occurs as the steel cools is offset by a volumetric expansion taking place within the sprayed steel, which allows the dimensional accurate tools to be produced. To ensure that the required phase transformation takes place, the temperature of the steel is regulated during spraying. The sprayed metal acts both as a source of mass and a source of heat and by adjusting the rate at which metal is sprayed; the surface temperature profile over the surface of the steel can be controlled. The temperature profile is measured using a thermal imaging camera and regulated by adjusting the rate at which the guns spray the steel. Because the temperature is regulated by adjusting the feed rate to an actuator that is moving over the surface, this is an example of mobile control, which is a class of distributed parameter control. The dynamic system has been controlled using a PI controller before. The paper describes the application of H∞ tracking type controller as the desire was for the average temperature to follow a desired profile. A study on the controllability of the underlying system was aimed at.
ISBN 0780388739
9780780388734
Language eng
Field of Research 090299 Automotive Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category E1 Full written paper - refereed
Copyright notice ©2004, IEEE
Persistent URL http://hdl.handle.net/10536/DRO/DU:30005411

Document type: Conference Paper
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