Predictive Modelling of P/M Gear Rolling

Kotthoff, Gerd; Leupold, Björn; Geiman, Timothy

doi:10.4271/2006-01-0386

Cited by 2 publications

(3 citation statements)

References 13 publications

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“…Conventional compacting and sintering steps are able to get a preform with core densities in the range of 7?1 g cm 23 . 7 Low strength requirements can be fulfilled within this range of part densities, however, highly loaded applications require much higher densities at the critically loaded regions. Other production processes are available, yet cost restrictions often hinder their usage.…”

Section: Production Of Pm Surface Densified Helical Gearsmentioning

confidence: 99%

“…In this paper, the authors concentrate on the rolling step since this is the most critical process influencing the final shape as well as the properties considering today's process knowledge. Several researchers have started studying this process recently, [1][2][3][4][5][6][7][8][9][10][11] however, most of them by experimental techniques.…”

Section: Introductionmentioning

confidence: 99%

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Finite element modelling of PM surface densification process

Yazıcı¹,

Kraft²,

Riedel³

2008

Powder Metallurgy

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The developments in the field of powder metallurgy (PM) enable production of complex shapes in a cost competitive way especially for automotive industry. Surface densification of sintered gears through a rolling process is a very promising technology, which enables densification of critically stressed surfaces and eventually better mechanical properties. This paper describes the complex forming behaviour of PM gear teeth during surface densification with help to finite element modelling (FEM)

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Section: Production Of Pm Surface Densified Helical Gearsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Finite element modelling of PM surface densification process

Yazıcı¹,

Kraft²,

Riedel³

2008

Powder Metallurgy

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show abstract

“…The development of high performance sintering steel powder and the introduction of high density technologies remarkably improved the density levels of P/M parts and their mechanical strengths. Warm compaction or high velocity compaction offered density levels of P/M parts up to 7.2×10 achieve gear tooth bending strengths and gear pitting resistances higher than 1000 and 1500 MPa, respectively (4,5) .…”

Section: Introductionmentioning

confidence: 99%

Properties of Densification by Surface Rolling and Load Bearing Capacity of 1.5Cr-0.2Mo High Density Sintered Steel Rollers and Gears

Takemasu

Koide

Takeda³

et al. 2011

JMMP

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Surface rolling experiments and surface durability tests were carried out using powder metallurgy (P/M) gears made of 1.5Cr-0.2Mo single-press single-sinter (1P1S) high density (7.55×10 3 kg/m 3 ) sintered steel. The fundamental densification properties of this P/M material were first examined using P/M rollers. A high precision form rolling machine of two roller-dies transverse type was employed. The porosity became nearly zero from the surface down to a depth of at least 0.5 mm when the amount of decrease in the roller radius was more than 0.15 mm. Next, the gear tooth profile analysis was done by finite element simulation (FE-simulation) to optimize some shape parameters of a modified convex tooth profile of P/M spur gears before rolling. Simulation results agree well with the experimental data and gears with good tooth profile accuracy and a fully densified surface layer of about 0.5 mm in depth on the gear flank could be obtained. The gear running tests were finally conducted using a power re-circulating type gear testing rig with a counter pinion gear made of Ni-Cr-Mo wrought steel. Both P/M gears and counter pinions were case-carburized and finished by grinding under the same conditions. The test results confirmed that high density 1.5Cr-0.2Mo P/M gears had sufficiently high load bearing capacity as an automotive power transmission gear and those surface durability tended to increase by surface rolling.

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Predictive Modelling of P/M Gear Rolling

Cited by 2 publications

References 13 publications

Finite element modelling of PM surface densification process

Finite element modelling of PM surface densification process

Properties of Densification by Surface Rolling and Load Bearing Capacity of 1.5Cr-0.2Mo High Density Sintered Steel Rollers and Gears

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