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Die-cavity design for high-precision nett-forming of engineering components

Objectif



Problem: The manufacture of high precision, engineering components for the aerospace, automotive and consumer goods industries requires that the primary form of the component is subjected to subsequent fine machining which incurs the following difficulties:
1. metal removal processes which are not easily controllable at the micron level of precision required.
2. metal removal from aerospace materials which is expensive and difficult to machine.
3. fixturing of components for fine machining which is expensive.
Solution: The current approach to achieving the nett form of components so that all downstream operations on functional surfaces may be eliminated, is to evolve the die form through proving trials; several iterations of this procedure, which may span as much as a year, enable the definition of the required die cavity. An attractive alternative is to develop an off line design support system which can negate the influence of all contributing factors ' the compensation of the die form prior to its manufacture.

Proposal: Research into the alternative approach was initiated in the, highly acclaimed, project BE 4129. An innovative tri axial force transducer enabled the mapping of the force contour on the die cavity using Physical Modelling techniques; this contour was used to initialise an elastic FE model of the die cavity to establish the deflection of the die during the forming operation and, hence, the die form compensation requirements to negate die elasticity errors. BE 4129 was initiated with the expectation that temperature changes in the die and the component would produce a component form error which would be significant in the overall die form compensation; component form errors arising from Secondary Yielding constitutes the third feature of a comprehensive consideration for high precision, nett forming of engineering components.

The proposal is to refine the approach, instrumentation and the software developed in project BE 4129, and to quantify the influence of, Secondary Yielding and thermal changes in the deformation zone, on component errors. All approaches will be encapsulated in a design support system which will enable the design of die cavities for high precision nett forming, "right first time". This commercial system will be available in month 50.

Benefits: The following benefits are expected:
the lead time to manufacture will be reduced by, at least, 50% as proving trials will not be necessary.
production runs need not be interrupted to enable proving trials. the entire development of the die cavity would be attended to on the proposed system.
reduction of the tool and die development cost by, at least, 60%. reduction of the investment in die cutting facilities by 20%. nett forming to hitherto unachieved tolerances.

Market: The industrial partners have estimated that the nett revenue, in the short term, would amount to 27 MECU; this discounts the expansion of the market due to the continued development of the by the consortium.

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Coordinateur

INSTITUTE FOR PRODUCT DEVELOPMENT
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Adresse
Technical University of denmark, building 424
2800 LYNGBY
Danemark

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