Seregno, Italy


Seregno, Italy
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Sokolowski P.,Hoeganaes Corporation | Milbrath A.,Hoeganaes Corporation Europe GmbH | Vitti D.,Metalsinter srl | Fontana S.,Metalsinter srl
Metal Powder Report | Year: 2016

Admixed lubricants used in Powder Metallurgy (PM) have been effective at meeting the needs of the industry to manufacture traditional PM parts. With increasing demand to improve upon part tolerances, surface finish, density distribution, weight consistency, and reduced environmental impact; parts makers desire to replace traditional lubricants such as Acrawax and Kenolube. In an effort to do so, AncorLube has been developed as an engineered lubricant system to enable robust part manufacturing. This work compares the production characteristics, based on lubricant type, for a water pump gear pressed to a density of 6.80g/cm3. The weight consistency was evaluated during serial production of more than 5000 gears, each weighing approximately 191 grams. A standard deviation of 0.6 grams was measured, indicating that a stable process was achieved with a premix containing AncorLube. Metallographic inspection of surface quality and density distribution was evaluated and compared against parts made with Kenolube. In addition, laboratory studies show improved ejection characteristics are obtained at typical press operating temperatures approaching 60°C (140°F). © 2015 Elsevier Ltd.

Alzati L.,TIMCAL Ltd | Gilardi R.,TIMCAL Ltd | Zurcher S.,TIMCAL Ltd | Pozzi G.,Metalsinter Srl | Fontana S.,Metalsinter Srl
Proceedings of the World Powder Metallurgy Congress and Exhibition, World PM 2010 | Year: 2010

This work targets the selection of the graphite powder type for PM applications. The use of Graphite Powder has two main goals in PM parts production: steel matrix hardening, by Carbon diffusion into Iron particles, and decrease of the friction coefficient, by solid state lubrication. It is discussed here how Graphite type and particles size distribution can affect flowability of the mix, dimensional change after sintering and mechanical properties of PM parts. Graphite particles size plays fundamental role in the production of Iron-based PM parts with low friction coefficient; both matrix reinforcement and uncompleted diffusion must be achieved: the PM valve guides case is briefly discussed.

Alzati L.,TIMCAL Ltd. | Gilardi R.,TIMCAL Ltd. | Pozzi G.,METALSINTER Srl | Fontana S.,METALSINTER Srl
Advances in Powder Metallurgy and Particulate Materials - 2011, Proceedings of the 2011 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2011 | Year: 2011

Graphite in structural PM parts is primarily responsible for the steel matrix hardening, by its diffusion into pure or prealloyed Iron particles. In-depth description of physical characteristics of Natural and Primary Synthetic Graphite is presented with reference to different behaviour during sintering. This work analyses as well production trials of complex shape PM components, discussing how selection of Graphite powder type and particles size distribution can contribute to improved dimensional consistency with benefits for productivity. Due to its solid lubrication properties, Graphite powder is used in PM industry to decrease friction coefficient in components like Copper-based bearings and Iron-based valve guides: particles size selection is discussed for these applications.

Alzati L.,Timcal Ltd | Gilardi R.,Timcal Ltd | Zurcher S.,Timcal Ltd | Pozzi G.,Metalsinter Srl | Fontana S.,Metalsinter Srl
Metal Powder Report | Year: 2010

In discussions of alloying additives for improving PM manufactured parts the role of carbon is often overlooked. However the role of carbon is crucial in two key respects. First, carbon assists steel matrix hardening by diffusion into iron particles. Second, it decreases the co-efficient of friction by solid state lubrication. Swiss/Italian research has looked at how graphite type and particle size distribution can affect flowability of the mix, dimensional change after sintering and mechanical properties of PM parts. So how do manufacturers select graphite powder when considering their process metallurgy? © 2010 Elsevier Ltd.

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