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die compaction
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Book: Powder Metallurgy
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006083
EISBN: 978-1-62708-175-7
... Abstract Warm compaction uses both powder heating and die heating to effect higher component densities, whereas warm die compaction uses only die heating to achieve higher density. This article explains the influences of green and sintered properties and pore-free density during compaction...
Abstract
Warm compaction uses both powder heating and die heating to effect higher component densities, whereas warm die compaction uses only die heating to achieve higher density. This article explains the influences of green and sintered properties and pore-free density during compaction of materials. It provides information on the concept of pore-free density and process considerations: die heating and powder heating. The article concludes with a review of the tooling design for warm compaction.
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Published: 30 September 2015
Fig. 12 Optimization for uniform density distribution during die compaction for a cutting tool fabricated from WC-Co. (a) Histogram for various processing conditions. (b) Green density distributions in the initial and optimum designs. Source: Ref 35
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Published: 30 September 2015
Fig. 13 Optimization to minimize the green density gradients during die compaction of a steel hub component. (a) Compaction tool set and analysis domain. (b) Variation of objective function during optimization iteration. (c) Green density distributions in the initial and optimum designs
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Published: 30 September 2015
Fig. 15 Effect of density distribution after die compaction on sintering and the formation of corner cracks. (a) Simulation result of green density gradients. (b) Experimental result of green compact. (c) Experimental result of sintered compact.
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Published: 30 September 2015
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Published: 01 November 2010
Fig. 12 Optimization for uniform density distribution during die compaction for a cutting tool fabricated from WC-Co. (a) Histogram for various processing conditions. (b) Green density distributions in the initial and optimum designs. Source: Ref 35
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Image
Published: 01 November 2010
Fig. 13 Optimization to minimize the green density gradients during die compaction of a steel hub component. (a) Compaction tool set and analysis domain. (b) Variation of objective function during optimization iteration. (c) Green density distributions in the initial and optimum designs
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Image
Published: 01 November 2010
Fig. 15 Effect of density distribution after die compaction on sintering and the formation of corner cracks. (a) Simulation result of green density gradients. (b) Experimental result of green compact. (c) Experimental result of sintered compact.
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Published: 01 January 1997
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Published: 30 September 2015
Fig. 52 Microstructure of a copper infiltrated valve seat insert die compacted from a mixture of water atomized HSS, solid state lubricant and intermetallic phase powders. Courtesy of Bleistahl
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Published: 30 September 2015
Fig. 2 Effects of compaction die temperature and compaction pressure on green density of a PM compact. RT, room temperature
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Published: 30 September 2015
Fig. 2 Density difference after altering the die fill and compaction conditions on the same type of part. Unetched
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Published: 01 November 2010
Fig. 3 Steps in powder compaction. A feed shoe provides powder to fill the die cavity, the upper and lower punch move toward each other to compact the powder, the lower and upper punches move upward to eject the part from the die, and the fill shoe removes the previous part and refills the die
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Published: 01 November 2010
Book: Powder Metallurgy
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006033
EISBN: 978-1-62708-175-7
... where these data help in the development of a constitutive model for sintering simulation. Finally, the article provides information on the simulation approaches used to optimize die compaction and sintering. compaction continuum modeling continuum plasticity models deformation densification...
Abstract
This article discusses continuum modeling, which is the most relevant approach in modeling grain growth, densification, and deformation during sintering. Continuum plasticity models are frequently used to describe the mechanical response of metal powders during compaction. The article illustrates the typical procedure for computer simulation for press and sinter process. It describes the procedure to obtain the material properties based on the generalized Shima-Oyane model. The article presents a wide variety of tests, accounting for data on the grain growth, densification, and distortion where these data help in the development of a constitutive model for sintering simulation. Finally, the article provides information on the simulation approaches used to optimize die compaction and sintering.
Book: Powder Metallurgy
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006074
EISBN: 978-1-62708-175-7
... Abstract This article describes the unique aspects of cold isostatic pressing (CIP) in comparison with die compaction, for powder metallurgy parts. It details the components of CIP equipment, including pressure vessels, pressure generators, and tooling material. The article reviews the part...
Abstract
This article describes the unique aspects of cold isostatic pressing (CIP) in comparison with die compaction, for powder metallurgy parts. It details the components of CIP equipment, including pressure vessels, pressure generators, and tooling material. The article reviews the part shapes and their influence in determining tap density of the filled mold. It provides a discussion on process parameters, such as dwell time, depressurization rate, evaluation of green strength and density, and thermal processing, and illustrates a process flowchart for the production of CIP parts.
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002486
EISBN: 978-1-62708-194-8
... conventional die compaction conventional press method conventional sinter method density metal injection molding powder forging powder metallurgy THE POWDER METALLURGY (P/M) process is a near-net or net-shape manufacturing process that combines the features of shape-making technology for powder...
Abstract
This article begins with a discussion on general powder metallurgy design considerations that assist in the selection of the appropriate processing method. It reviews powder processing techniques, conventional press-and-sinter methods, and full-density processes to understand the design restrictions of each powder processing method. The article provides comparison of powder processing methods based on their similarities, differences, advantages, and disadvantages. It concludes with a discussion on design issues for the components of powder processing technologies.
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005502
EISBN: 978-1-62708-197-9
... compaction changes during the split-second pressure stroke, because lubricant (polymer) particles deform and undergo viscous flow to the die wall, effectively changing friction constantly during compaction. Thus, the simulations are approximations using extrapolated data and simplified relations...
Abstract
This article presents the governing equations and methodologies to model the press and sinter powder metallurgy, including continuum, micromechanical, multiparticle, and molecular dynamics approaches. It describes the constitutive relation for compaction and sintering. The article discusses the experimental determination of material properties and simulation verification for compaction and sintering. It reviews the use of modeling and simulation of press and sinter powder metallurgy, including gravitational distorting in sintering, compaction optimization, sintering optimization, and coupled press and sinter optimization.
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in Nondestructive Evaluation of Pressed and Sintered Powder Metallurgy Parts[1]
> Nondestructive Evaluation of Materials
Published: 01 August 2018
Fig. 5 Defects in green PM compacts. (a) Artificial defect caused by the inclusion of a thin wax sliver in the die fill. Unetched. (b) Artificial defect produced by partially filling a die, compacting the powder at 345 MPa (50 ksi), adding more powder, and compacting at 620 MPa (90 ksi
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Book: Powder Metallurgy
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006034
EISBN: 978-1-62708-175-7
... some of the developments for PM presses in the last 40 years. Other recent improvements in compaction technology include: Split-die techniques to make multilevel parts having different peripheral contours at different levels Punch rotation capability to facilitate production of helical gears...
Abstract
Powder metallurgy compacting presses usually are mechanically or hydraulically driven, but they can incorporate a combination of mechanically, hydraulically, and pneumatically driven systems. This article provides a comparison of mechanical and hydraulic presses based on the cost, production rate, and machine overload protection. The article lists the classification of powder metallurgy parts based on complexity of shapes as suggested by the Metal Powder Industries Federation, such as Class I parts, Class II parts, Class III parts, and Class IV parts. It describes rigid tooling compaction and details the powder-fill ratio considerations for these classes. The article elaborates on the types of tooling systems and presses used for these classes. Some important factors and components used in designing a tool are also described. Finally, the article considers tool materials, including punches, core rods, and punch clamp rings.
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