Sumico Lubricant Co.

Inabe, Japan

Sumico Lubricant Co.

Inabe, Japan
SEARCH FILTERS
Time filter
Source Type

Sagisaka Y.,Industrial Research Institute of Shizuoka Prefecture | Ishibashi I.,Sumico Lubricant Co. | Nakamura T.,University of Shizuoka | Sasaoka E.,University of Shizuoka | Hayakawa K.,University of Shizuoka
Special Edition: 10th International Conference on Technology of Plasticity, ICTP 2011 | Year: 2011

An aluminium fluoride coating Is a popular lubricant film for aluminium alloy cold forging In Japan. However, it has high environmental risks because a lot of wastes including fluorine are generated during the coating process. The authors applied a double-layer-type environmentally friendly solid lubricant film to a precipitation hardened aluminium alloy. The lubrication performance was evaluated by a friction test based on combined forward rod-backward can extrusion. Six projections were provided on the taper face of the forward extrusion die In order to realize large surface expansion condition. The double-layer-type lubricant showed superior lubrication performance compared to aluminium fluoride coating. Effects of preprocess were Investigated. The double-layer-type lubricant showed low constant friction shear factors when it was applied on a workpiece preprocessed by wet-blasting. © 2011 Wiley-VCH Verlag GmbH & Co. KGaA. Weinheim.


Yamaguchi T.,Mie University | Kayano K.,Sumico Lubricant Co. | Noro K.,Sumico Lubricant Co. | Kawaguchi M.,Mie University
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2014

The effects of heating and shearing on the rheological properties of poly(tetra fluoro-ethylene) (PTFE, 0.2μm particles) suspensions in silicone oil 1000cSt were investigated. The suspensions were heated at 140°C for 1 day and then sheared at a rate of 1000s-1 for 30min. Four suspensions were prepared: the unheated and unsheared suspension, the heated and unsheared suspension, the unheated and sheared suspension, and the heated and sheared suspension. Hysteresis loops, stress-strain (S-S) sweep curves, oscillatory dynamic moduli, and steady state shear flow curves of the suspensions were measured at 25°C. No hysteresis was observed in the hysteresis loops for any of the suspensions. Two yield stresses were observed in the S-S sweep curves of the unsheared suspensions. Shearing caused the lower yield stress to fade but retained the higher yield stress. The S-S sweep curves of the sheared suspensions were nearly superimposable regardless of heating. The movement of the position of a target in the sheared suspensions occurred at a larger strain than that in the unsheared suspensions. Shearing caused changes in the oscillatory dynamic moduli of storage (G') and loss (G″) as a function of strain: the unsheared suspensions behaved as solid-like viscoelastic matter, whereas the sheared suspensions gave similar magnitudes of the G' and G″ values in the linear regions. Beyond the linear region, the G″ value showed strain overshoot regardless of the treatment. The steady state shear flow curves of the suspensions were compared with the Herschel-Bulkley equation; their fits were comparable and the calculated parameters in the equation were well correlated to the historical treatments of the suspensions. © 2014 Elsevier B.V.


Sagisaka Y.,Industrial Research Institute of Shizuoka Prefecture | Ishibashi I.,Sumico Lubricant Co. | Nakamura T.,University of Shizuoka | Sekizawa M.,Sumico Lubricant Co. | And 2 more authors.
Journal of Materials Processing Technology | Year: 2012

The authors proposed double-layer-type environmentally friendly lubricants, which were composed of an undercoat, superior in adhering to a material, and an overcoat, superior in reducing the friction between the material and the die. The performance of these lubricants for cold forging was evaluated by the ring compression test, the combined forward rod-backward can extrusion-type friction test and the combined forward conical can-backward straight can extrusion-type friction test. The double-layer-type lubricants showed comparable friction characteristics and anti-pick-up properties to a conversion coating lubricant, when the film thickness and surface treatment before coating were improved. In a practical application by cold multistage forging, the double-layer-type lubricants showed a similar performance to a conversion coating lubricant. © 2012 Elsevier B.V. All rights reserved.


Sagisaka Y.,Ind Research Institute Of Shizuoka Prefecture | Hayakawa K.,University of Shizuoka | Nakamura T.,University of Shizuoka | Ishibashi I.,Sumico Lubricant Co. | Nakakura T.,Sumico Lubricant Co.
Advanced Materials Research | Year: 2014

Although the aluminum fluoride conversion coating has been a popular lubricant for aluminum cold forging in Japan, it has considerable environmental risks and troubles in cost. Double-layer-type environmentally-friendly solid lubricant films have been developed as the substitute. One of the lubricants was evaluated by a friction test based on the combined forward spline-backward can extrusion. The lubricating ability of the double-layer-type lubricant changed through the year. It showed best ability in the rainy season in Japan. Next, the double-layer-type lubricant was applied on three kinds of aluminum alloys to examine the influence of flow stress of materials on the lubricating properties. The lubricating abilities were almost same for each material in the rainy season. Those of the hardest material were higher than others in the winter. Machined and wet-blasted workpieces were tested to investigate the effect of preprocess. A remarkable friction reduction effect by preprocess was observed with the hardest material. The effect of preprocess was not significant for the materials with lower flow stress. © (2014) Trans Tech Publications, Switzerland.


Sagisaka Y.,Industrial Research Institute of Shizuoka Prefecture | Nakamura T.,University of Shizuoka | Hayakawa K.,University of Shizuoka | Ishibashi I.,Sumico Lubricant Co.
Journal of Manufacturing Processes | Year: 2013

It is required to replace the aluminum fluoride coating, which is a popular lubricant for aluminum alloy cold forging in Japan, with environmentally friendly lubricants, because the aluminum fluoride coating has high environmental risks and needs much expense. Evaluations of lubrication performance are necessary before lubricant replacement. The authors proposed new friction test based on combined forward spline-backward can extrusion. It can realize large surface expansion, which is a characteristic of aluminum cold forging. In the present paper, a double-layer-type environmentally friendly solid lubricant film and the aluminum fluoride coating were applied to a precipitation hardened aluminum alloy. The lubrication performance was evaluated by the friction test. The double-layer-type lubricant showed superior performance enough for the replacement. The effect of surface treatment applied to workpiece on the lubrication performance was also investigated. The surface asperity generated by a wet-blasting showed high pickup resistance and low friction. © 2012 The Society of Manufacturing Engineers.

Loading Sumico Lubricant Co. collaborators
Loading Sumico Lubricant Co. collaborators