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

Lubricating Performance of Residual Zinc Phosphate Coating on Forged Specimen in Bowden-Leben Sliding Test

2018 ◽  
Vol 767 ◽  
pp. 124-130 ◽  
Author(s):  
Osamu Kada ◽  
Zhi Gang Wang
Keyword(s):  
Surface Roughness ◽  
Friction Coefficient ◽  
Zinc Phosphate ◽  
Cold Forging ◽  
Phosphate Coating ◽  
Specimen Temperature ◽  
Tool Surface ◽  
Residual Thickness ◽  
Surface Expansion ◽  
Sliding Test

The lubricating performance of the zinc phosphate coating employed generally in cold forging is evaluated with Bowden-Leben sliding test by changing friction conditions such as the coating thickness, specimen temperature, the tool surface roughness, contact pressure and sliding speed. A specimen for the friction test is prepared from the inner surface of an extruded square cup and the residual thickness of the lubrication coating on the specimen is controlled by using the surface expansion in forward extrusion of the cup. Experimental results showed that the specimen temperature has the strongest influence on the friction coefficient. With an increase of the specimen temperature, the friction coefficient gradually decreases until 473K, and then increases sharply. With an increase of the tool surface roughness, the friction coefficient increases slightly. Friction coefficient is formulated as a function of the specimen temperature and the tool surface roughness. The anti-galling ability of the coating is affected by the residual thickness of lubrication coating, the specimen temperature and the tool surface roughness.

The Effect of Tool Surface Roughness in Cold Work Extrusion

2011 ◽  
Vol 11 (2) ◽  
pp. 367-372 ◽  
Author(s):  
S. Syahrullai ◽  
C.S.N. Azwadi ◽  
M.R. Abdul Kadi ◽  
N.E.A. Shafie
Keyword(s):  
Surface Roughness ◽  
Cold Work ◽  
Tool Surface

scholarly journals Effect of Lubrication and Forging Load on Surface Roughness, Residual Stress, and Deformation of Cold Forging Tools

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 783
Author(s):  
Karunathilaka ◽  
Tada ◽  
Uemori ◽  
Hanamitsu ◽  
Fujii ◽  
...  
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
High Speed ◽  
Compressive Force ◽  
Cold Forging ◽  
Metallic Contact ◽  
Heat Treated ◽  
Stress Surface ◽  
Stress And Deformation ◽  
Forging Load

Cold forging is a metal forming that which uses localized compressive force at room temperature. During the cold forging process, the tool is subjected to extremely high loads and abrasive wear. Lubrication plays an important role in cold forging to improve product quality and tool life by preventing direct metallic contact. Surface roughness and residual stress also greatly affects the service life of a tool. In this study, variations in surface roughness, residual stress, and specimen deformation with the number of cold forging cycles were investigated under different forging conditions. Specimens that were made of heat-treated SKH51 (59–61 HRC), a high-speed tool steel with a polished working surface, were used. The specimens were subjected to an upsetting process. Compressive residual stress, surface roughness, and specimen deformation showed a positive relationship with the number of forging cycles up to a certain limit and became almost constant in most of the forging conditions. A larger change in residual stress and surface roughness was observed at the center of the specimens in all the forging conditions. The effect of the magnitude of the forging load on the above discussed parameters is large when compared to the effect of the lubrication conditions.

Study on surface roughness and residual stress change during cold forging.

2017 ◽  
Vol 2017.55 (0) ◽  
pp. K0303
Author(s):  
Nuwan KARUNATHILAKA ◽  
Naoya TADA ◽  
Takeshi UEMORI ◽  
Toshiya NAKATA ◽  
Masahiro KAWANO
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Stress Change ◽  
Cold Forging

Study on Causes of Material Plastic Side Flow in Precision Hard Cutting Process

2010 ◽  
Vol 97-101 ◽  
pp. 1875-1878
Author(s):  
Guang Jun Chen ◽  
Xian Li Liu ◽  
Cai Xu Yue
Keyword(s):  
Surface Roughness ◽  
Cutting Process ◽  
Surface Plastic ◽  
Forming Mechanism ◽  
Strip Edge ◽  
Tool Surface ◽  
Cutting Experiment ◽  
Side Flow ◽  
The Mathematical Model ◽  
Hard Cutting

There are many special cutting disciplines needed to research in precision hard cutting process. The plastic side flow on machining surface influences machining surface roughness great. The mathematical model of hump height for surface plastic side flow is built based on the model of precision hard cutting and forming mechanism of surface plastic side flow is analyzed. Effect of cutting feed on the maximum scallop height of machining surface is researched and microscopic observation of surface topography is made through the hard cutting experiment. In certain conditions, the machining surface roughness and the cutting off trace increase with cutting feed. Because of the metal softening, some metal which formed side flow fall off immediately but make plastic flow on the strip edge of machining surface when it flows out tool surface. This research supplied theoretical basis for prediction of hard cutting process surface quality.

Micro-SACE scanning process with different tool-surface roughness

2020 ◽  
Vol 35 (11) ◽  
pp. 1181-1187
Author(s):  
Yubin Pu ◽  
Hao Tong ◽  
Junjie Li ◽  
Yong Li ◽  
Bolin Ji
Keyword(s):  
Surface Roughness ◽  
Scanning Process ◽  
Tool Surface

Lubrication efficiency of vegetable oil nano-lubricants and solid powder lubricants

2018 ◽  
Vol 233 (7) ◽  
pp. 1384-1392
Author(s):  
Peyman Mashhadi Keshtiban ◽  
Saeid Sheydaei Govarchin Ghaleh ◽  
Vali Alimirzaloo
Keyword(s):  
Surface Roughness ◽  
Aluminum Alloy ◽  
Friction Coefficient ◽  
Environmental Risk ◽  
High Surface ◽  
High Surface Area ◽  
Cold Forging ◽  
Forging Process ◽  
Oil Reserves ◽  
Friction Calibration

Reducing crude oil reserves and also environmental pollution caused by its excessive use has led to numerous researches to find alternatives to petroleum-based oils. Thus, owing to lower pollution and higher lubrication efficiency, the use of vegetable base lubricants has been widely considered. Due to the unique properties of different nanoparticles such as sphericality and high surface area besides low environmental risk, the subjected nanoparticles can be applied as additives to the base lubricants and create optimal tribological properties. In this study, in order to improve the lubricating efficiency of vegetable base lubricants, SiO2nanoparticles with different weight concentrations were used in the cold forging process of aluminum alloy. Then, the lubrication proficiency of both nano-lubricants and conventional solid powder lubricants in the forging industry was evaluated. Friction coefficient was determined by standard compression test and friction calibration curves. In order to evaluate the lubricants’ efficiency, two key parameters, namely shear friction coefficient and surface roughness have been considered. Experimental results showed that the presence of SiO2nanoparticles in the base lubricants significantly increased the lubrication efficiency of the base lubricants and notably reduced both the friction coefficient and surface roughness.

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