Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . uponthese dies just before the flange is nearly complete. Asthe metal is very soft at this heat, there will not be nearas much friction as there would be if the metal were cold,consequently the wedging action is more severe. Thedies often break in this kind of work. Fig. 46 shows a cast iron die at E, flanging the sheet v//////»- <y//////////////////;/////;////////////L^^ • , ZZ! Fram< Figure 49Flanging spaces between boiler and frame. F. Upon this die there is acting a force P, which
Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . uponthese dies just before the flange is nearly complete. Asthe metal is very soft at this heat, there will not be nearas much friction as there would be if the metal were cold,consequently the wedging action is more severe. Thedies often break in this kind of work. Fig. 46 shows a cast iron die at E, flanging the sheet v//////»- <y//////////////////;/////;////////////L^^ • , ZZ! Fram< Figure 49Flanging spaces between boiler and frame. F. Upon this die there is acting a force P, which tendsfirst, to bend the dies . downward, secondly, when theflange is nearly finished, to press the dies outward. A re-enforcing plate of wrought iron bolted to the die E addswonderfully to its strength. It should always be placed 92 Flanging. on the tension side of the die and so strengthen the diein both directions. When the back end of the boiler is shaped like Plate3, frequently a long flange is required for the fire is obtained in the manner shown in Figs. 47 and 48. y/^m/MMM//// I. The Derry Collard 50Cross section showing flanging of Fig. 49. The first of these two figures represents the back fire boxsheet clamped between the dies E and F. The first oper-ation is to bend the sheet with the die A, thus stretchingthe metal from the beginning of the fillet, until a posi-tion is arrived at, gaged by experience, somewhat asshown in the figure. The sheet is then removed and a 3 or4-inch hole is bored through the center, depending uponthe size of the door. Then it is reheated, centered uponthe dies F and clamped to E. A conical shaped die A isnow forced through the opening and flanges the sheet asseen in this figure. The die A is pushed through andthe key K removed. A flat portion of about ij^ inchesis allowed upon the die at H. In Fig. 49 is seen quite a common construction wherethe boiler fits very snugly between the frames and whereit is desired to get
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Keywords: ., bookcentury1900, bookdecade1910, bookidlocomotivebo, bookyear1912
