Approach for reducing variation in weight of PM green parts in mass productive pressing line by addition of nanoparticle to raw material powder

Tomoshige Ono, Takanori Sato, Yukiko Ozaki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Variation in weight of green compacts is one of the issues to be resolved in PM parts production lines. This variation is correlated with fluctuation of apparent density of powder in a filler shoe that moves continuously. In this study to understand this phenomenon and find out the solution, the fluctuation of apparent density of the iron powder mixture during shaking was investigated, and correlations between the fluctuation and adhesive factors obtained from direct share test were evaluated from the view point of the effects of additive materials. The apparent density of the powder mixture with wax-lubricant decreased drastically after multiple shakes, and this prominent decline could be suppressed by the addition of a small amount of nanoparticles. Both adhesive force and friction angle of the powder with wax-lubricant were larger than the other powder mixtures without wax, and declined by the addition of nanoparticles. These results indicate that wax lubricant can form an unstable particle bridge structure through repeated shakes because of its adhesive property, and nanoparticles have the role to inhibit the formation of the bridge structure. This nanoparticle addition can be a key to productivity in the compacting line of PM parts.

Original languageEnglish
Title of host publicationAdvances in Powder Metallurgy and Particulate Materials - 2014, Proceedings of the 2014 World Congress on Powder Metallurgy and Particulate Materials, PM 2014
PublisherMetal Powder Industries Federation
Pages326-333
Number of pages8
ISBN (Electronic)0985339764, 9780985339760
Publication statusPublished - Jan 1 2014
Externally publishedYes
Event2014 World Congress on Powder Metallurgy and Particulate Materials, PM 2014 - Orlando, United States
Duration: May 18 2014May 22 2014

Other

Other2014 World Congress on Powder Metallurgy and Particulate Materials, PM 2014
CountryUnited States
CityOrlando
Period5/18/145/22/14

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All Science Journal Classification (ASJC) codes

  • Materials Chemistry
  • Metals and Alloys
  • Surfaces and Interfaces

Cite this

Ono, T., Sato, T., & Ozaki, Y. (2014). Approach for reducing variation in weight of PM green parts in mass productive pressing line by addition of nanoparticle to raw material powder. In Advances in Powder Metallurgy and Particulate Materials - 2014, Proceedings of the 2014 World Congress on Powder Metallurgy and Particulate Materials, PM 2014 (pp. 326-333). Metal Powder Industries Federation.