ステンレス鋼用高性能冷間鍛造油の開発
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1 Development of High Performance Cold Forging Oil for Stainless Steel Toshihide Ohmori, Kazuhiko Kitamura ClP ( ) Cl P-Zn ( P ) ClP-Zn High performance cold forging oil for stainless steel has been developed to realize the galling prevention property superior to those of present commercial oils and low corrosiveness against ferrous materials. The effect of extreme pressure additives on the galling prevention has been investigated using the tapered plug penetration method. As a result, sample oils containing a Cl-type additive (stearic acid trichloride) and P-type additives (phosphoric acid and oleyl acid phosphate) were found to exhibit an excellent galling prevention property due to the synergistic effect of both types of additives. It was discovered that adding zinc phosphate into the oil suppressed the corrosiveness of the oil without reducing the galling prevention property. The target of the development has been satisfactorily accomplished by the composition of the additives including stearic acid trichloride, phosphoric acid, oleyl acid phosphate and zinc phosphate. The developed oil showed excellent performance in practical cold forging tests. The production line using the developed oil has brought enormous benefits to the cost, productivity and production environment. R&D Vol. 31 No. 3 ( )
2 SUS430 SUJ2 HV195Rmax510µm H R C59Ra0.05µm Tapered plug penetration test. R&D Vol. 31 No. 3 ( )
3 Dt Di R 1469% maxr 9% maxr9% 2.45MN 370mm/s (a) (b) Reduction in cross-sectional area of workpiece (R) in tapered plug penetration test. S 1 P 1 Cl 2 S-Cl Cl maxr 4% maxr9% Appearances of tapered plugs after tapered plug penetration test. Galling prevention property of commercial lubricants evaluated by tapered plug penetration test. R&D Vol. 31 No. 3 ( )
4 maxr4% maxr9% Cl P Cl 4 S 5 P 6 Cl S PP-1P-5 96mm 2 /s at 40 C 5wt%P Additives used and their galling prevention property. P-6 Table 2 maxr1% Fig. 3 1% Cl maxr46% 4% ClP P-6 Cl maxr6% Cl-1 maxr4% Cl-2 ClP Cl PmaxR4%Cl P P-1P-5: blended to mineral oil at 5 wt%p P-6: blended to mineral oil at 2.2 wt% of phosphoric acid and 4 wt% of oleyl acid phosphate with heat treatment at 120 for 1 hour Synergistic effect between Cl type additive and P type oil. R&D Vol. 31 No. 3 ( )
5 maxr4% Cl P50wt% maxr9% Cl Cl-2 P ( P-6 maxr14% XPS X- ray photoelectron spetroscopy a Cl Cl-2 bp P-6 Cl P ccl P Cl Cl-2 50wt% P P-6 EPMA Electron probe microanalysis P P Cl 50wt%P20wt% Cl P50wt%Cl Cl Cl XPS spectra of workpieces surface after tapered plug penetration test. ( R: 4%, Analyzed location: 25mm from top end of workpiece ) Influence of P-type oil on galling prevention property and reactivity. ( Mixed system with Cl-2 and P-6, Cl-2: 50 wt% ) R&D Vol. 31 No. 3 ( )
6 P Fig. 6Fig. 7 P SUS430 EPMA Cl Cl-2 Cl P P-6 P ClP50wt% Cl P P P ClP P PSUS430 P PPCl ClP Influence of Cl-type additive on galling prevention property and reactivity. ( Mixed system with Cl-2 and P-6, P-6: 50 wt% ) Results of static reaction test. ( SUS430, 120 C30min ) R&D Vol. 31 No. 3 ( )
7 P Cl P ClP P Cl P P Fig. 7P Cl Cl ClP 60 C 35g SPCC mm 14 Cl Cl-2 P P-6 ClP Solubility of iron chloride to sample oil. ( FeCl 2 4H 2 O, 100 C ) Reaction mechanism on stainless steel surface. R&D Vol. 31 No. 3 ( )
8 5wt% ClP maxr9% Cl Cl P Cl ClP Zn 3 (PO 4 ) 2 4H 2 O P-6 2wt%P-Zn ClP-Zn 5wt% ClP-Zn ClP maxr9% Galling prevention property and corrosiveness. P type oil (P-6), wt% Cl type additive (Cl-2), wt% Commercial Cl type oil 0.5 Commercial P type oil 1.5 : maxr9% ( tapered plug penetration test ) Value : corroded depth ( µm ) : without rust, : with rust Galling prevention property and corrosiveness. P-Zn type oil (P-6 with zinc phosphate), wt% Cl type additive (Cl-2), wt% Commercial Cl type oil 0.5 Commercial P type oil 1.5 : maxr9% ( tapered plug penetration test ) Value : corroded depth ( µm ) : without rust, : with rust R&D Vol. 31 No. 3 ( )
9 Cl Cl P-Zn P P ClP-Zn EPMA Cl Cl-2 Cl ClP P-6 P-Zn P-6 with zinc phosphate P Fig. 6 Fig. 7 P P-Zn ClPP-Zn Cl Cl PP-Zn P-Zn P P ClP-Zn Amounts of reaction products on surface after corrosion test. Solubility of iron phosphate to sample oil. ( FePO 4 4H 2 O, 100 C ) R&D Vol. 31 No. 3 ( )
10 Cl P-Zn Cl ClP-Zn SUS304 Cl 20m/min 30m/min Corrosion control mechanism on steel surface. Example of practical application. R&D Vol. 31 No. 3 ( )
11 1), :, (1992), 77 2) Kaiser, H : Proc. 13th Int. MTDR Conf., (1972), 555 3) Komatsuzaki, S., Nakano, F., Uematsu, T. and Nakahara, T. : Lubr. Eng., (1985), 98 4) Ohmori, T., Kitamura, K., Danno, A. and Kawamura, M. : Wear, (1992), 183 5),,, :, - 393(1993), ),, :, (1994), 809 7), :, (1994), 211 8), :, (1994), 473 9), :, (1995), 23 10) Ohmori, T., Kitamura, K., Danno, A. and Kawamura, M. : Tribol Trans., -3(1991), ),,, :, -10(1991), ) Davey, W. : J. Inst. Petroleum, (1945), ) Gauthier, A., Montes, J. and Georges, J. M. :ASLE Trans., (1982), ), :, (1996), ),,, :, -3(1992), R&D R&D R&D Vol. 31 No. 3 ( )
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