Roll pressure modeling of multipass warm rolling of carbon steel
Tóm tắt
For various reasons, ferrous warm rolling has been considered in the last 15 years to be a potentially valuable manufacturing process. However, no systematic approach has been undertaken to assess intrinsic manufacturability as indicated by such parameters as roll separating force and energy or power consumption. The purpose of this investigation is to characterize experimentally the effect of various process variables on the contact areacompensated roll separating force (separating pressure). AISISAE 1015 and 1059 steel billets were warm rolled at temperatures ranging between 300 °C and 700 °C with various thickness reductions per pass up to a short transverse strain of about — 1 at a strain rate of 10 s− 1. Two approaches were used to model in predictive fashion the influence of important warm rolling variables on the separating pressure. The first approach entailed the use of a least squares regression method to produce an empirical equation for the separating pressure. A second approach utilized a semiempirical warm working flow stress equation along with the theoretical slab method and a roll flattening concept. Good agreement was found between the experimental and the predicted roll pressures.
Tài liệu tham khảo
S. E. Rogers:Metall. Met. Form., 1976, vol. 43, pp. 36–39.
R. Shah, P. J. Mullins, and W. G. Patton:Iron Age Metalwork Int., 1971, vol. 10, pp. 25–27.
A. A. Popoff and J. R. Becker:Met. Eng. Quart., 1972, vol. 12, pp. 21–29.
B. Appell:J. Mech. Work Tech., 1978, vol. 2, pp. 197–203.
P. Mullins:Iron Age Metalwork Int., 1977, vol. 16, pp. 19–20.
T. N. Popova, V. G. Chikina, R. I. Valentova, and P. L. Munder:STAL, 1976, vol. 4, pp. 351–353.
B. Orrling:Jernkontorets Ann., 1977, vol. 161, pp. 104–108.
T. Okamoto and C. Hayashi:Sheet Metal Ind., 1973, vol. 50, pp. 297–302.
D. N. Hawkins and G. Tsinopoulos:J. Mech. Work Tech., 1978, vol. 2, pp. 161–177.
D. L. Bourell:Res. Mech. Ltrs., 1981, vol. 1, pp. 417–421.
K. Yuasa and Y. Murata:Metall. Met. Form., 1974, vol. 41, pp. 290–297.
D. N. Hawkins:Met. Tech., 1978, vol. 5, pp. 37–44.
C. Persad: U. T. Austin, Ph.D. Dissertation, 1983.
D. L. Bourell and O. D. Sherby:Met. Trans., 1981, vol. 12A, pp. 140–142.
D. L. Bourell: Stanford University, Ph.D. Dissertation, 1979.
C. M. Young, B. Walser, E. P. Abrahamson, and O. D. Sherby:Scripta Met., 1975, pp. 35–38.
E. V. Subramanian: U. T. Austin, M. S. Thesis, 1983.
E. Orowan:Proc. Inst. Mech. Engrs., 1943, vol. 150, pp. 140–167.
W. F. Hosford and R. M. Caddell:Metal Forming Mechanics and Metallurgy, pp. 120–131, Prentice-Hall, Inc., NJ, 1983.
W. A. Backofen:Deformation Processing, pp. 176–177, Addison-Wesley Publ. Co., CA, 1972.
D. L. Bourell, U. T. Austin, Unpublished research, 1983.
K. Osakada and S. Fujii:J. Mech. Work Tech., 1978, vol. 2, pp. 241–253.
J. H. Hitchcock: ASME Report of Special Research Committee on Roll Neck Bearings, 1935, pp. 33–41.
D. R. Bland and H. Ford:Proc. Inst. Mech. Engrs., 1948, vol. 159, pp. 144–163.
B. Avitzur:Int. J. Mach. Too Des. Res., 1980, vol. 20, pp. 197–210.
G. D. Lahoti, S. N. Shah, and T. Allan:J. Engr. Ind., 1978, vol. 100, pp. 159–165.
R. D. Venter and Abd-Rabbo:Int. J. Mech. Sci., 1980, vol. 22, pp. 83–92.
R. D. Venter and Abd-Rabbo:Int. J. Mech. Sci., 1980, vol. 22, pp. 93–98.
T. Sheppard and M. A. Zaidi:Met. Tech., 1982, vol. 9, pp. 52–59.
J. A. Schey:Introduction to Manufacturing Processes, p. 145, McGraw-Hill Inc., MO, 1977.