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Production of an undercut shaped sprocket by CNC press
LITERATU RE REVI EW
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Powder production
Fundamentals
Effect of process variables on particle size during inert gas atomisation V.C.Srivastava, S.N.Ojha. (Banarar Hindu University, Varanasi, India.) PM Science/Technology Briefs, Vol 3, No 3, 2001, 5"9.
Finite element analysis for IocaUsation phenomena in metal powder forming A.R.Khoei, R.W.Lewis. (University of Wales, Swansea, UK.) Finite Elements in Analysis and Design, Vo[ 38, 2002, 5o3-519.
Al-6.5%Si powder was produced by inert gas atomisation and effects of process parameters on particle size and morphology were investigated. Gas velocity profile and aspiration at the melt delivery tube tip are influenced by configuration of delivery tube and gas flow channel. This affects particle size and size distribution. Increase in gas pressure and increase in melt temperature, decreased particle size, which is also influenced by gas:meh ratio. Particle morphology, spherical to elongated, was affected by atomisation conditions. The results are discussed.
Pressing Literature
Page
P0wderpr0ducti0n
P34
Pressing Fundamentals Iron and Steel Magnesium Tungsten Ceramic materials Coatings Electrical and magnetic materials Hard materials and tool steels Metal injection moulding Superalloys PM components Hard materials High performance materials General topics Powder injection moulding Alloy steels
P34 P34 P35 P35 P35 P35 P35 P35 P35 P36 P36 P36 P37 P37 P38 P39 P39
For copies of full papers you are recommended to contact individual authors, use the Interlibrary Loan system or, for conference papers, to contact the conference organizers
34
lanuary 2003
Production of an undercut shaped sprocket by CNC press T.Hirao et al. (Nissan Motor Co. Ltd., Yokohama, Japan.) J.Japan Soc Powder/ Powder Meta[l., Vol 48, No 5, 2ooi, 432439. In Japanese. Production of undercut-formed parts was investigated. A undercut sprocket was shaped in a computer controlled press with newly designed tooling. Equipment features and technical matters are described. Objectives were avoidance of cracks, attainment of uniform density and dimensional tolerances and prevention of tool breakage.
Development of warm compacted PM sprockets for automotive engines A.Fujiki et al. (Nissan Motor Co. Ltd., Yokohama, Japan.) J.Japan Soc Powder/ Powder Meta[l., Vol 48, No 5, 2ooi, 44o444. In Japanese. It is noted that warm compaction has been little used to make automotive parts. Mechanical properties and wear resistance of warm compacted car parts, including engine sprockets, were investigated. A method for control of powder temperatures is described.
It is noted that finite clement methods suffer excessive mesh dependence when used with strain hardening models. A finite element solution of solid mechanics problems, with regard to metal powder forming, is presented. Re-meshing is used to estimate distribution of element sizes. Results, using von Mises yield criteria, are applied to a multi-level part at the final compaction stage. It is shown how the method is applied to improvement of definition of shear band using a non-local model to avoid loss of mesh objectivity.
A neural network approach for solution of the inverse problem for selection of PM materials L.N.Smith et al. (University of West of England, Bristol, UK.) J. Mater. Proc. Technol., Vo112o, 2002, 419-425. Research into solution of problems in materials science, using artificial intelligence techniques, is reported. The object was to process output data, final materials properties, into input process settings and powder parameters. Existing procedures are reviewed and shown to have disadvantages. Neural network procedures are considered to be suitable for use in PM modelling for materials selection. Experimental data for ferrous materials was used and process input data was deduced.
Modelling of metal powder compaction using the cap model - numerical implementation and applications A.Gakwaya et al. (Laval University, Quebec, Canada.) Int. J. Solids/ Structures, Vol 39, No 4, 2002, 1o77-1o96. Use of finite element simulations, as a design tool in PM is reviewed with reference to prediction of density and stress distribution in parts and choice of stress and strain measures. Implementation of the cap constitutive model is described. An integrated simulation module is developed. This is shown to allow definition of tooling and powder geometry. Simulation of a part is presented.
metal-powder.net
:~;
,!!iii
~
~i[!~i¸¸
....!ill
iii!ill
Powder production
Fundamentals
Effect of process variables on particle size during inert gas atomisation V.C.Srivastava, S.N.Ojha. (Banarar Hindu University, Varanasi, India.) PM Science/Technology Briefs, Vol 3, No 3, 2001, 5"9.
Finite element analysis for IocaUsation phenomena in metal powder forming A.R.Khoei, R.W.Lewis. (University of Wales, Swansea, UK.) Finite Elements in Analysis and Design, Vo[ 38, 2002, 5o3-519.
Al-6.5%Si powder was produced by inert gas atomisation and effects of process parameters on particle size and morphology were investigated. Gas velocity profile and aspiration at the melt delivery tube tip are influenced by configuration of delivery tube and gas flow channel. This affects particle size and size distribution. Increase in gas pressure and increase in melt temperature, decreased particle size, which is also influenced by gas:meh ratio. Particle morphology, spherical to elongated, was affected by atomisation conditions. The results are discussed.
Pressing Literature
Page
P0wderpr0ducti0n
P34
Pressing Fundamentals Iron and Steel Magnesium Tungsten Ceramic materials Coatings Electrical and magnetic materials Hard materials and tool steels Metal injection moulding Superalloys PM components Hard materials High performance materials General topics Powder injection moulding Alloy steels
P34 P34 P35 P35 P35 P35 P35 P35 P35 P36 P36 P36 P37 P37 P38 P39 P39
For copies of full papers you are recommended to contact individual authors, use the Interlibrary Loan system or, for conference papers, to contact the conference organizers
34
lanuary 2003
Production of an undercut shaped sprocket by CNC press T.Hirao et al. (Nissan Motor Co. Ltd., Yokohama, Japan.) J.Japan Soc Powder/ Powder Meta[l., Vol 48, No 5, 2ooi, 432439. In Japanese. Production of undercut-formed parts was investigated. A undercut sprocket was shaped in a computer controlled press with newly designed tooling. Equipment features and technical matters are described. Objectives were avoidance of cracks, attainment of uniform density and dimensional tolerances and prevention of tool breakage.
Development of warm compacted PM sprockets for automotive engines A.Fujiki et al. (Nissan Motor Co. Ltd., Yokohama, Japan.) J.Japan Soc Powder/ Powder Meta[l., Vol 48, No 5, 2ooi, 44o444. In Japanese. It is noted that warm compaction has been little used to make automotive parts. Mechanical properties and wear resistance of warm compacted car parts, including engine sprockets, were investigated. A method for control of powder temperatures is described.
It is noted that finite clement methods suffer excessive mesh dependence when used with strain hardening models. A finite element solution of solid mechanics problems, with regard to metal powder forming, is presented. Re-meshing is used to estimate distribution of element sizes. Results, using von Mises yield criteria, are applied to a multi-level part at the final compaction stage. It is shown how the method is applied to improvement of definition of shear band using a non-local model to avoid loss of mesh objectivity.
A neural network approach for solution of the inverse problem for selection of PM materials L.N.Smith et al. (University of West of England, Bristol, UK.) J. Mater. Proc. Technol., Vo112o, 2002, 419-425. Research into solution of problems in materials science, using artificial intelligence techniques, is reported. The object was to process output data, final materials properties, into input process settings and powder parameters. Existing procedures are reviewed and shown to have disadvantages. Neural network procedures are considered to be suitable for use in PM modelling for materials selection. Experimental data for ferrous materials was used and process input data was deduced.
Modelling of metal powder compaction using the cap model - numerical implementation and applications A.Gakwaya et al. (Laval University, Quebec, Canada.) Int. J. Solids/ Structures, Vol 39, No 4, 2002, 1o77-1o96. Use of finite element simulations, as a design tool in PM is reviewed with reference to prediction of density and stress distribution in parts and choice of stress and strain measures. Implementation of the cap constitutive model is described. An integrated simulation module is developed. This is shown to allow definition of tooling and powder geometry. Simulation of a part is presented.
metal-powder.net