. Railway age gazette . cast iron box for case-hardening. A 2 in. layer of burnt bone is placed on thebottom and the material to be hardened is placed on thisabout 34 ill- apart, special care being taken that no twopieces touch. Raw bone is packed between each two pieces.\\hen the box is full it is covered with a 2 in. layer of boneand a lid made of boiler plate covers the box. By using thisit is not necessary to use fire clay. A semi-muffled furnacehaving a perforated arch between the box and the com-bustion chamber is used. This furnace has flues in the wallopposite the burner that run down
. Railway age gazette . cast iron box for case-hardening. A 2 in. layer of burnt bone is placed on thebottom and the material to be hardened is placed on thisabout 34 ill- apart, special care being taken that no twopieces touch. Raw bone is packed between each two pieces.\\hen the box is full it is covered with a 2 in. layer of boneand a lid made of boiler plate covers the box. By using thisit is not necessary to use fire clay. A semi-muffled furnacehaving a perforated arch between the box and the com-bustion chamber is used. This furnace has flues in the wallopposite the burner that run down to the bottom, giving annutlet under the bottom of tlie box. This provides a uniformheat. The box is heated to al)out 1,450 deg. F. and held atthat temperature for about 12 hours. The material is thenremoved and quenched in cold running water. This processgives a casehardening about 1/16 in. to 3/32 in. deep. D. Huskey, Chicago Great \\estern: We use a steel boxin which is placed a layer of charcoal. On top of this is. Fig. 10—Dies for Making Engine Truck Frames firmly packed a 1^ in. layer of cyanide and salt material to be hardened is placed on top of this aboutj in. apart and is covered with a layer of cyanide and process is repeated until the box is filled and it is thenCLivered and sealed with fire clay or sand. The box is heatedin an oil furnace to about a lemon color and kept at thatheat for from nine to twelve hours. This system producesa casehardened surface about i/i2 in. to 5/64 in. deep. HEAT TREATMENT OF METALS H. E. Gamble, Pennsylvania Railroad: The PennsylvaniaRailroad has carried on quite a little experimental work inthe heat treatment of metals for the last three or four years,but it was not until January 1. 1913, that they decided toapply heat treatment to their locomotives. They have nowat the Juniata shops a complete heat-treating plant for thereciprocating parts of all locomotives. Included in theseparts are main rods, side rods, ax
Size: 2251px × 1111px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1913
