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2 2008

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Optimisation of up- and down-milling processes for a corner feature

Dotcheva M., Millward H.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2008

z. 73 [253]

73-80

This paper presents the specifics of the two types of end-milling, up- and down-milling, in the context of process planning of a finishing operation for machining complex pocket features. An optimisation mechanism is used for a pocket type of end-milling operation with the aim of comparing the results from up- and down-milling when the same process constraints have been applied. Two sets of cutting conditions have been generated and analysed for each type of end-milling. The first cutting condition has constant parameters for the entire tool path, derived from the worst case of cutting, representing the usual process planning approach The second set of cutting conditions represents the optimised process. The predicted results were verified through experiments. The optimised, measured cutting parameters, when machining the critical corner, accurately demonstrate the important changes in magnitude and direction of the radial cutting-tool deviation and surface error

Design and rapid manufacture of selected cellular type structures

Dotcheva M., Thomas D., Millward H.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2008

z. 73 [253]

81-88

The work presented in this paper aims to explore the enhancements that the Selective Laser Melting technology can bring to the design, manufacture, and performance of cellular type structures. Cellular type structures possess valuable characteristics such as low density, high strength, good energy absorption, good thermal and acoustic properties. These advantageous characteristics make them industry desirable but the difficulties of producing them limit their applications. The capabilities of some metal cellular structures as fundamental elements for creating new internal material configurations for injection moulding tools hat been evaluated. The preliminary investigation highlights ihe requirements and the feasibility of such structures for the purpose of injection moulding tooling. Lattice cellular structures appear to be mechanically competitive alternatives to prismatic honeycombs structures. It has been illustrated that lattice core of injection moulding can be capable of supporting significant structural and process loads while also could facilitating cross flow heat exchange.