ABSTRACT
In the following, some experimental data produced by the Institute for Metalforming at the Technical University Berg akademie Freiberg is presented. These data might be fruitfully used by mill engineers, mechanical engineers, and metallur gists. Figure 4-12 illustrates the measured nondimensional maximum spread at the oval-round (or round-oval) pass rolling sequence for nonferrous materials and alloy steels as
Figure 4-7 (a) The Freiburg continuous pilot mill for bar, rod, and strip rolling (5 stands for rod and bar rolling; 4 stands for strip roll ing). (Courtesy of Dr. G. Goldhahn and Dr. R. Kawalla of the Techni cal University Bergakademie, Freiburg, Germany.) (b) Inductive heater (rear), roller table, descaler, two-high reversing mill (FO, roughing). (Courtesy of Dr. G. Goldhahn and Dr. R. Kawalla of the Technical University Bergakademie, Freiberg, Germany.)
Figure 4-8 (a) Reversing mill (FO, roughing), driver side. (Courtesy of Dr. G. Goldhahn and Dr. R. Kawalla of the Technical University Bergakademie, Freiburg, Germany.) (b) Reversing mill (FO), rear side and continuous finishing mills (F1-F3). (Courtesy of Dr. G. Goldhahn and Dr. R. Kawalla of the Technical University Bergakademie, Freiberg, Germany.)
Figure 4-9 (a) Roughing mill (FO) during a rolling trial. (Courtesy of Dr. G. Goldhahn and Dr. R. Kawalla of the Technical University Bergakademie, Freiburg, Germany.) (b) Sample inside the interstand cooling line behind the roughing mill (FO). The tube cover is open, for demonstration. (Courtesy of Dr. G. Goldhahn and Dr. R. Kawalla of the Technical University Bergakademie, Freiberg, Germany.)
Figure 4-10 (a) Sample in the finish cooling line (open), (b) Rod rolling, drive side, finishing mills F1-F4. (Courtesy of Dr. G. Goldhahn and Dr. R. Kawalla of the Technical University Bergakademie, Freiberg, Germany.)
Figure 4-11 (a) Coiler for thin strip rolling and (b) coiler with coil boxes for controlled thin strip cooling. (Courtesy of Dr. G. Goldhahn and Dr. R. Kawalla of the Technical University Bergakademie, Freiberg, Germany.)
Table 4-4 Technical Specifications of Other Experimental Rod Rolling Mills at the Freiberg Institute for Metalforming
functions of rolling temperature. Wj and Wmax represent, respectively, the width of the incoming workpiece and the maxi mum spread of the outgoing workpiece. Recall that the analytic model proposed by (Lee, 2002; Lee and Goldhahn, 2001) has demonstrated that the exit cross section can be predicted once the maximum spread of the workpiece is known beforehand (see Chap. 5-3). This implies that we can predict easily the exit cross section of nonferrous materials and alloy steels if we use the experimental data in Figure 4-12. It shows that
maximum spread of alloy steel (ӀООСгб) and nonferrous steel (A199.5) is almost independent of the rolling temperatures. Meanwhile, the maximum spread of alloy steel (Sts38u-2) is influenced by the rolling temperature. The maximum spread of Sts38u-2 starts decreasing as the rolling increases after 1000°C. The maximum spread of nonferrous steel (Cu99.97) begins to decrease at the rolling temperature of approximately 750°C for a round-oval pass and about 700°C for oval-round pass rolling. This experimental data is quite interesting because some steels exhibit increasing maximum spread as the rolling temperature increases. An example of this is illus trated in Figure 5-24.
