Warm Compaction: FEM Analysis of Stress and Deformation States of Compacting Dies with Rectangular Profile of Various Aspect Ratio

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The deformation under radial pressure of rectangular dies for metal powder compaction has been investigated by FEM. The explored variables have been: aspect ratio of die profile, ratio between diagonal of the profile and die height, insert and ring thickness, radius at die corners, interference, different insert materials, i. e. conventional HSS, HSS from powders, cemented carbide (10% Co). The analyses has ascertained the unwanted appearance of tensile normal stress on brittle materials, also “at rest”, and even some dramatic changes of stress patterns as the die height increases with respect to the rectangular profile dimensions. Different materials behave differently, mainly due to difference of thermal expansion coefficients. Profile changes occur when the dies are heated up to the temperature required for warm compaction. The deformation patterns depend on compaction temperature and on thermal expansion coefficients.

Info:

Periodical:

Materials Science Forum (Volumes 534-536)

Edited by:

Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim

Pages:

329-332

DOI:

10.4028/www.scientific.net/MSF.534-536.329

Citation:

E. Armentani et al., "Warm Compaction: FEM Analysis of Stress and Deformation States of Compacting Dies with Rectangular Profile of Various Aspect Ratio ", Materials Science Forum, Vols. 534-536, pp. 329-332, 2007

Online since:

January 2007

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Price:

$38.00

[1] E. Armentani, G. F. Bocchini, G. Cricrì, R. Esposito, Short dies and thin-walled insert for room temperature or warm compaction - numerical determination of design features, Powder Metallurgy, July 1, 2002, Vol. 45, No 2, pp.115-133.

DOI: 10.1179/003258902225002541

[2] E. Armentani, G. F. Bocchini, G. Cricrì, R. Esposito, Metal powder compacting dies: optimised design by analytical or numerical methods, Powder Metallurgy, 2003, Vol. 46, No 4, pp.349-360.

DOI: 10.1179/003258903225008607

[3] E. Armentani, G. F. Bocchini, G. Cricrì, R. Esposito, Deformation states of dies for Powder compacting. Comparison between analytical and FEM calculation, 2002 World Congress on Powder Metallurgy & Particulate Materials, June 16-21, 2002, Orlando, Florida.

DOI: 10.4028/0-87849-419-7.329

[4] E. Armentani, G. F. Bocchini, G. Cricrì, R. Esposito, Optimised design parameters for twice shrink-fitted dies in plane stress conditions, Proceedings, EURO PM2003, Oct. 20-22, 2003, Valencia, Spain, pp.285-290.

[5] E. Armentani, G. F. Bocchini, G. Cricrì, R. Esposito, FEM Optimisation of Twice Shrink Fitted Dies in Metal Powder Compacting, Proceedings, EURO PM2003, October 20-22 2003, Valencia, Spain, pp.77-82.

DOI: 10.1179/1743290111y.0000000027

[6] E. Armentani, G. F. Bocchini, G. Cricrì, R. Esposito, Advantages of FEM Approach for Reliable Evaluations and Design of PM Tools, Conference Proceedings of Euro PM2004, October 17-21, 2004, Vienna, Austria, Vol. 1, pp.623-635.

[7] E. Armentani, G. F. Bocchini, G. Cricrì, R. Esposito, Compacting dies with rectangular profile: FEM analysis of stress states for different geometries. EURO PM 2005, Congress & Exhibition, EPMA, 2-5 October, Prague, Czech Republic.

DOI: 10.4028/0-87849-419-7.329

[8] E. Armentani, G. F. Bocchini, G. Cricrì, R. Esposito, Compacting dies with rectangular profile: FEM evaluation of profile deformation on compaction, TOOL 06, 7th International Tooling Conference, 2 - 5 May 2006, Turin.

DOI: 10.4028/0-87849-419-7.329

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