Optimization of the Steady Combined Forward and Backward Extrusion Test for Higher Sensitivity to Friction in Cold Forging

Cheng Liang Hu; Shogo Osaki; Bai Xuan Cai; Mitsuru Aoyama

doi:10.4028/p-225h26

Paper Titles

Identifying Heterogeneous Friction Coefficients on the Hot Forming Tools in Mannesmann Cross-Roll Piercing
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Tribological Behavior of High-Strength Aluminum Alloys in Combination with Dry Lubricants at High Forming Temperatures
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Effect of Die Coating on Tearing in Hot Extrusion of 7075 Aluminum Alloy
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Heat Transfer Coefficient of Zinc Phosphate Coating with Metal Soap during Cold Backward Extrusion
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Optimization of the Steady Combined Forward and Backward Extrusion Test for Higher Sensitivity to Friction in Cold Forging
p.147

Investigation on the Influence of the Tribological System on Cold Forging and Ejection of Hollow Components with Helical Internal Geometry
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Temperature Dependency of Friction of Titanium Alloy by Forward Rod-Backward can Combined Extrusion Test
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Experimental Investigation on Slip Conditions during Thread Rolling with Flat Dies
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Friction Stir Powder Incremental Forming for Fabrication of Sandwich-Structured Composite of Open-Cell Nickel Foam with Aluminum
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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 414Optimization of the Steady Combined Forward and...

Optimization of the Steady Combined Forward and Backward Extrusion Test for Higher Sensitivity to Friction in Cold Forging

Abstract:

To improve the sensitivity of the steady combined forward and backward extrusion test proposed in previous work, an optimization job based on the finite element simulations was carried out. A raw material of 0.45% carbon steel was tested under different stain rates from 0.001s^-1 to 1s^-1 and different temperatures from 30°C to 400°C, and the material flow stresses were modelled by Hensel-Spittel equation. The deformation degree of the forward extrusion was set as 50%. The key parameters including the deformation degree of the backward extrusion, the ratio between the radius of the punch nose and the radius of the punch, the taper angle of the punch, the die angle, the sizing lands of the punch and the die were optimized. The sensitivity of the optimal design is improved about 20% compared with previous design when the friction factor is assumed as 0.03~0.15. The new group of calibration curves presents more scatter than the old group. The sensitivity improvement is also validated by the experimental works.

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Periodical:

Defect and Diffusion Forum (Volume 414)

Pages:

147-153

DOI:

https://doi.org/10.4028/p-225h26

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Online since:

February 2022

Authors:

Cheng Liang Hu*, Shogo Osaki, Bai Xuan Cai, Mitsuru Aoyama

Keywords:

Cold Forging, Friction, Optimization, Sensitivity, Simulation

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* - Corresponding Author

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