Daido Chemical Industry Co.

Nara-shi, Japan

Daido Chemical Industry Co.

Nara-shi, Japan
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Inagaki S.,Daido Chemical Industry Co. | Ishii T.,Daido Chemical Industry Co. | Hu Q.,Jing Jiang Heng Feng Chemical Co. | Ren X.P.,Jing Jiang Heng Feng Chemical Co. | Wakimoto M.,Daido Chemical Industry Co.
Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan | Year: 2017

Cold sheet gauge rolling in a tandem mill is used to produce many types of steel, including automotive and high-strength steel sheet. A recirculating oil in water emulsion is used as a lubricant between the roll and material in sheet gauge rolling. With an increase in steel sheet production and the ratio of high-strength steel sheets, the amount of fine iron particles produced by the rolling process also increases. Thus, maintaining the cleanliness of the mill and sheet is difficult when using conventional rolling oil with a non-ionic emulsifier, as dispersion of fine iron particles is not enough efficient. Therefore, a rolling oil is developed by adding a cationic emulsifier to a conventional rolling oil used for sheet gauge rolling. As a positive charge is produced on the surface of the newly developed oil, it can easily disperse fine iron particles that would otherwise adversely affect the cleanliness of both the mill and sheet. In this study, the newly developed oil was compared with conventional oil with a non-ionic emulsifier in a laboratory to verify its performance. The following findings were then applied to an actual mill. The oil developed for sheet gauge production was used in an actual mill to maintain stable emulsion to ensure a high level of productivity without friction pick-up. Fine iron particles that are inevitably produced owing to the rolling process were effectively removed. The newly developed oil is superior to conventional oil in terms of maintaining the cleanliness of the mill and steel sheet.


Iida M.,Nara Women's University | Kawakami S.,Nara Women's University | Syouno E.,Daido Chemical Industry Co. | Er H.,Ningxia University | Taguchi E.,Osaka University
Journal of Colloid and Interface Science | Year: 2011

Ionic liquids of an N-alkylethylenediamine-silver(I) complex cation (alkyl=hexyl, 2-ethylhexyl, and octyl) or a protic N-alkylethylenediaminium cation (alkyl=butyl, hexyl, 2-ethylhexyl, octyl, decyl, and dodecyl) with a bis(trifluoromethanesulfonyl)amide counter anion (Ag-ILs and PILs, respectively) were prepared and their physicochemical properties were investigated. The trend of solidification decreased in the order octyl≫hexyl>2-ethylhexyl for the Ag-ILs, and butyl>dodecyl>decyl>octyl>hexyl≫2-ethylhexyl for the PILs. The diffusion coefficients of the cations indicated stronger intermolecular interactions in PILs than in the Ag-ILs because of hydrogen-bonding networks, and it has been revealed that the intermolecular interactions increase in the order, hexyl


Azushima A.,Yokohama National University | Uda K.,Daido Chemical Industry Co. | Maki J.,Nippon Steel & Sumitomo Metal Corporation | Nomura N.,Nippon Steel & Sumitomo Metal Corporation
Journal of Materials Processing Technology | Year: 2016

It is desired that the coefficient of friction is reduced in hot stamping of the aluminized 22MnB5 steels. It was reported that ZnO coated aluminized steel reduced the coefficient of friction and the amount of Al-Fe intermetallic compounds (IMC) adhered on the tool surface. In this paper, the frictional behavior of ZnO coated aluminized 22MnB5 steel when sliding against tool steel was investigated. The non-coated tool and the coated tools with TiN, TiAlN and DLC-Si were used. The experimental tests were carried out under dry condition using the hot flat drawing test machine. The coefficients of friction for the drawing distance were measured. After drawing, the Al-Fe IMC adhered on the tool surface was analyzed and the profile of tool surface was measured. For the non-coated tool, the amounts of adhered Al-Fe IMC of ZnO coated aluminized 22MnB5 steel were lower than that of aluminized 22MnB5 steel, and the coefficients of friction decreased, On the other hand, for the coated tools, the coefficient of friction became lower and the adhered aluminum became significantly thinner. © 2015 Elsevier B.V.


Uda K.,Daido Chemical Industry Co. | Azushima A.,Yokohama National University | Yanagida A.,Tokyo Denki University
Journal of Materials Processing Technology | Year: 2016

The use of lubricants is effective for decreasing the forming load in hot stamping of Al-coated 22MnB5 steel. It is desired that new lubricants for hot stamping are developed. In this study, first, the coefficients of friction were measured using commercial lubricants for hot forging with the hot flat drawing simulator. The coefficient of friction of a commercial lubricant that consisted of a hydrophilic polymer and a mineral salt was the lowest. Second, lubricants with added different solid lubricants were newly developed and their coefficients of friction were measured. The coefficient of friction of the lubricant with added swellable mica was the lowest. Third, the formability of Al-coated 22MnB5 steel using the newly developed lubricant was examined with the hot deep drawing test machine and its formability was superior. A new high-performance lubricant for hot stamping was developed. © 2015 Elsevier B.V.


Watanabe M.,Nara Women's University | Takemura S.,Nara Women's University | Kawakami S.,Nara Women's University | Syouno E.,Daido Chemical Industry Co Ltd. | And 3 more authors.
Journal of Molecular Liquids | Year: 2013

Protonation sites of a chelating mono-protic ionic liquid (PIL) comprising N-hexylethylenediaminium (= HHexen+) depending on the counter anion were studied by 15N and 13C NMR spectroscopy and DFT calculation. In the case of the bis(trifluoromethanesulfonyl) amide (= TFSA -) PIL, the protonation occurred almost at the secondary amine, whereas the protonation occurred preferentially at the primary amine in the trifluoroacetate (= TFA-) PIL. The formation of a chelating copper(II) complex with the cationic unit of the PIL despite the electrostatic repulsion was revealed using the paramagnetic broadenings of the 13C NMR spectra of the PILs. © 2013 Elsevier B.V.


Fujimoto H.,Kyoto University | Watanabe S.,Kyoto University | Okamoto T.,Daido Chemical Industry Company Ltd | Hama T.,Kyoto University | Takuda H.,Kyoto University
Experimental Thermal and Fluid Science | Year: 2015

Spray-cooling methods are utilized in quench hardening and throughout the metal-forming industry. Aqueous solutions of water-soluble polymers are the typical quenchant. Although the impact behavior of the droplets has a great influence on the heat transfer between the hot metal surface and quenchant, the hydrodynamics of drops of aqueous polymer solutions are rarely studied. In this study, the collision of drops of an aqueous solution of polymer with a hot sapphire solid surface was investigated using strobe photography. A solution of 10. wt% polyoxyethylene polyoxypropylene glycol, with an average molecular weight of approximately 20,000, was used as the test polymer quenchant. Experiments were conducted with drop diameters in the range 2.09-2.42. mm, impact velocities from 0.83 to 1.25. m/s, and surface temperatures of 200, 350, and 500. °C. The effect of varying the temperature and the dimensionless Weber number on the collision behavior and drop evolution was investigated. Microscopic observations revealed that polymer residue remained on the surface when the temperature of the solid was equal to or less than 350. °C. At 500. °C, drops impacting on the surface at low Weber numbers deformed into a thin disc, recoiled, and finally rebounded off the solid in a spray of mist. No polymer residue remained. The residence times of the rebounding drops after impact increased with the Weber number. In addition, the measured residence times were slightly longer than some experimentally determined formulae for simple compound liquid drops predict. © 2014 Elsevier Inc.


Azushima A.,Yokohama National University | Uda K.,Daido Chemical Industry Co. | Matsuda H.,Yokohama National University
Journal of Materials Processing Technology | Year: 2014

The hot stamping of aluminum-coated 22MnB5 has usually been conducted under dry condition, for which the forming load is high since the coefficient of friction is over 0.5. In order to decrease the forming load, the authors previously proposed the use of a lubricant to decrease so that the coefficient of friction from over 0.5 to 0.3. However, it is necessary to understand the heat transfer property in hot stamping under lubricated condition. The purpose of this paper is to examine the heat transfer property of aluminum-coated 22MnB5 in hot stamping under dry and lubricated conditions. In this study, the die and specimen temperatures were measured during compression and compression-sliding tests under dry and lubricated conditions using the hot flat drawing test simulator. In the compression test, the die and specimen temperatures measured under dry and lubricated conditions were the same. On the other hand, in the compression-sliding test up to a sliding distance of 70 mm, the die temperature under lubricated condition was lower than that under dry condition, and it was found that the heat transfer under lubricated condition is superior to that under dry condition. Consequently, there is a difference between the specimen temperatures under dry and lubricated conditions. However, from the results of the tensile test, there is no difference between the tensile strengths under dry and lubricated conditions. © 2014 Elsevier B.V. All rights reserved.


Azushima A.,Yokohama National University | Inagaki S.,Daido Chemical Industry Co. | Ohta H.,Yokohama National University
Tribology Transactions | Year: 2011

The plating-out film thickness during rolling in cold rolling with emulsion is quantitatively estimated for the improvement of productivity and the precise control of surface qualities after rolling. The estimating method of the plating-out film thickness was investigated using the numericalmethod of the inlet oil film thickness under the starvation condition of emulsion. The estimation model was proposed using a new starvation model considering the plating-out film on the roll and strip surface proposed by Azushima, et al. Sheets and coil sheets of aluminum A1050H and mineral oil with a viscosity of 0.235 Pa · s were used. It is reasonable that the value of trapping ratio in the sheet rolling could be used as the value of the trapping ratio in the coil rolling. From the experimental results, the effect of the emulsion concentration and the emulsifier on the plating-out film thickness was examined using the numerical method. The plating-out film thickness increased with increasing emulsion concentration and the plating-out film thickness was relatively dependent on the affinity of the emulsion particle for the steel surface of the emulsifier. Copyright © Society of Tribologists and Lubrication Engineers.


Azushima A.,Yokohama National University | Ohta H.,Yokohama National University | Inagaki S.,Daido Chemical Industry Co.
Tribology Transactions | Year: 2011

The manufacturing of stainless steel with higher brightness is improved using emulsion oil. However, in cold rolling of stainless steel with emulsion oil, it is well known that the surface brightness irregularity on the sheet surface after rolling occurs when the rolling speed is higher. It is estimated from the experimental results that the cause of the surface brightness irregularity is due to the degree of starvation in the emulsion rolling. The rolling experiments of the stainless steel with oil-in-water emulsion were carried out at various rolling speeds. The inlet oil film thickness was estimated using the evaluating system. In cold sheet rolling of stainless steel with emulsion oil, the surface brightness irregularity occurred at a rolling speed of 0.6 m/s with emulsion concentrations of 3, 5, and 10%. The experimental results showed that the surface brightness irregularity at cold coil rolling with emulsion of stainless steel occurred under a degree of starvation value of 0.16. © Society of Tribologists and Lubrication Engineers.

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