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1 Prace Naukowe Instytutu Technologii Maszyn i Automatyzacji Politechniki Wrocławskiej. Konferencje

1 2003

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Development of characteristic numbers for evaluating maintainable designs

Heisel U., Stehle T., Schleich B.

Prace Naukowe Instytutu Technologii Maszyn i Automatyzacji Politechniki Wrocławskiej. Konferencje

2003

Vol. 84, nr 41

35-44

As preliminary investigations by the Institute for Machine Tools confirm, practical experiences of the users show that the maintainability often plays a secondary role in the development and the design of machining systems. The reasons for that are various. In the absence of suitable characteristic numbers, the economic benefit of a maintainable design is difficult to quantify for practical application. The paper is concerned with a possible approach to the economic evaluation of machine assemblies and components such as main spindle, feed drives with guides and pallet changing system, also with regard to the expenditure on their maintenance. With the help of the LCC equations (optimization of the life cycle costs for machines and machining centres [1]), the costs of the life cycle phases are determined by using the example of a pallet changing system (see Chapter 2) of a medium-sized machining centre. The comparison demonstrates that improving the maintainability in designing offers economic advantages, resulting in corresponding reductions in maintenance costs. In addition, this paper presents a procedure for drawing up a design catalogue for maintainable development and design by using the example of a chip collection system (suction hood close to tool) developed at the IfW.