In machining, tool temperatures and thus tool wear are significantly influenced by frictional behaviour. Friction tests are used to determine the friction coefficient depending on relative speed, ...which serves as basis for parameterising friction models as input data for chip formation simulations. Therefore, this paper represents investigations towards the frictional behaviour of uncoated and coated (TiN, TiAlN) carbide tools when using two different relative movements (translational and rotary) and cooling lubricant conditions. In dry conditions, the investigations show insignificant influence of different engagement surfaces and testing kinematics on resulting friction. In lubricated conditions, three different friction coefficient sections were observed.
Display omitted
The existing production methods for manufacturing of internal threads are suitable for producing detachable, high-strength joints in lightweight materials. Depending on the technology applied, there ...are process-related variations in the thread quality. Especially in the context of mass production of aluminum components, high productivity and quality are to be obtained. Innovative tapping technologies provide advanced process concepts, which allow minimized production times. In this study, the technical properties of internal threads are investigated in relation to the manufacturing process. By applying scientific valuation methods, the analysis of different tapping technologies for aluminum casting materials is achieved.
The aim of this study is to evaluate impact of varying core hole diameters on resulting thread quality for helical thread forming. Regarding to common applications in mass production of engine ...casings in automotive industy, the experiments were performed in AlSi10MnMg cast alloy and thread size M6. Regarding the forming process by analysis of mechanical tool loads measured, various characteristics and microstructure of flank profile, it has been found out that the core diameter has a significant influence on thread quality resulted. It points out that for increased pre-drilling diameters, lower tool loads occur while flanks are formed incomplete.
Geplante Obsoleszenz Erik Poppe, Jörg Longmuß / Erik Poppe, Jörg Longmuß
2019
eBook
Immer wieder liest man, dass Hersteller ihre Produkte bewusst so konstruieren, dass sie vorzeitig kaputtgehen. Die Leidtragenden: die Kunden. Viele Hersteller aber wollen den Verschleiß hinauszögern. ...Wie gehen sie vor, um Obsoleszenz zu planen?Der Band präsentiert erstmals die Sicht und die Erfahrungen derer, die Produkte entwickeln, konstruieren und fertigen. Die Beiträge beschäftigen sich mit Reparierbarkeit als Geschäftsmodell, Product Lifecycle Management, Obsoleszenz als Managementthema, der Rolle staatlicher Einflussnahme und den gesellschaftlichen Treibern der Kurzlebigkeit von Konsumartikeln.
Existing budgeting tools take only the short-term view; here, we present an interface for scenario-based, long-term planning. Our work is grounded in recent empirical advances in behavioral ...economics. We present a system architecture and suggest contributions and directions for future research.
