scholarly journals Development of Upsetting-Extrusion Type Tribometerfor Evaluating Lubricant Coating Performance in Cold Forging

2010 ◽  
Vol 51 (591) ◽  
pp. 336-341 ◽  
Author(s):  
Zhigang WANG ◽  
Shinobu KOMIYAMA ◽  
Ryuichi TOKUNAGA ◽  
Yuichi YAMAOKA
Keyword(s):  
Cold Forging ◽  
Coating Performance ◽  
Lubricant Coating

scholarly journals Effect of Tool Surface Roughness on Friction Behaviorof Lubricant Coating in Cold Forging

2010 ◽  
Vol 51 (591) ◽  
pp. 342-347 ◽  
Author(s):  
Shinobu KOMIYAMA ◽  
Zhigang WANG ◽  
Ryuichi TOKUNAGA ◽  
Yuichi YAMAOKA
Keyword(s):  
Surface Roughness ◽  
Cold Forging ◽  
Lubricant Coating ◽  
Tool Surface

A modern technique for high productivity cold forging

1962 ◽  
Vol 41 (9) ◽  
pp. 552 ◽  
Author(s):  
R. Hayward ◽  
P.J. Mullins
Keyword(s):  
Cold Forging ◽  
High Productivity ◽  
Modern Technique

Some investigations on punch force in cold forging process by FE simulation

2021 ◽  
Author(s):  
Praveenkumar M. Petkar ◽  
V. N. Gaitonde ◽  
T. K. G. Raju
Keyword(s):  
Fe Simulation ◽  
Cold Forging ◽  
Punch Force ◽  
Forging Process

scholarly journals Anti-Galling Cold, Dry Forging of Pure Titanium by Plasma-Carburized AISI420J2 Dies

2021 ◽  
Vol 11 (2) ◽  
pp. 595
Author(s):  
Tatsuhiko Aizawa ◽  
Tomoaki Yoshino ◽  
Yohei Suzuki ◽  
Tomomi Shiratori
Keyword(s):  
Pure Titanium ◽  
Solid Lubrication ◽  
Cold Forging ◽  
Contact Interface ◽  
Metallic Titanium ◽  
Low Friction ◽  
Debris Particles ◽  
Titanium Wire ◽  
Oxide Debris

A bare AISI420J2 punch often suffers from severe adhesion of metallic titanium as well as titanium oxide debris particles in dry, cold forging of biomedical titanium alloys. This punch was plasma-carburized at 673 K for 14.4 ks to harden it up to 1200 HV on average and to achieve carbon supersaturation in the carburized layer. This plasma-carburized punch was employed in the cold, dry forging of a pure titanium wire into a flat plate while reducing the thickness by 70%. The contact interface width approached the forged workpiece width with increasing the reduction ratio. This smaller bulging deformation reveals that the workpiece is upset by homogeneous plastic flow with a lower friction coefficient. This low-friction and anti-galling forging process was sustained by an in situ solid lubrication mechanism. Unbound free carbon was isolated from the carbon-supersaturated AISI420J2 matrix and deposited as a thin tribofilm to protect the contact interface from mass transfer of metallic titanium.

scholarly journals Cold Forging Effect on the Microstructure of Motorbike Shock Absorbers Fabricated by Tube Forming in a Closed Die

2021 ◽  
Vol 11 (5) ◽  
pp. 2142
Author(s):  
Trung-Kien Le ◽  
Tuan-Anh Bui
Keyword(s):  
Material Flow ◽  
Cold Forging ◽  
Technological Parameters ◽  
Forming Process ◽  
Tube Forming ◽  
Shock Absorbers ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Quality Of Products ◽  
Forming Defects

Motorbike shock absorbers made with a closed die employ a tube-forming process that is more sensitive than that of a solid billet, because the tube is usually too thin-walled to conserve material. During tube forming, defects such as folding and cracking occur due to unstable tube forming and abnormal material flow. It is therefore essential to understand the relationship between the appearance of defects and the number of forming steps to optimize technological parameters. Based on both finite element method (FEM) simulations and microstructural observations, we demonstrate the important role of the number and methodology of the forming steps on the material flow, defects, and metal fiber anisotropy of motorbike shock absorbers formed from a thin-walled tube. We find limits of the thickness and height ratios of the tube that must be held in order to avoid defects. Our study provides an important guide to workpiece and processing design that can improve the forming quality of products using tube forming.

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