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Steel MakingHeat Treatment Of Lathe Planer And Similar ToolsFIRE.--For these tools a good fire is one made of hard foundr... Preparing Parts For Local Case-hardening At the works of the Dayton Engineering Laboratories Company, ... Annealing Method Forgings which are too hard to machine are put in pots with ... The Effect Of Tempering On Water-quenched Gages The following information has been supplied by Automatic and ... Chrome-nickel Steel Forging heat of chrome-nickel steel depends very largely on ... Bessemer Process The bessemer process consists of charging molten pig iron int... Impact Tests Impact tests are of considerable importance as an indication ... Correction For Cold-junction Errors The voltage generated by a thermo-couple of an electric pyrom... Non-shrinking Oil-hardening Steels Certain steels have a very low rate of expansion and contract... Properties Of Alloy Steels The following table shows the percentages of carbon, manganes... Temperatures To Use As soon as the temperature of the steel reaches 100 deg.C. (... A Satisfactory Luting Mixture A mixture of fireclay and sand will be found very satisfactor... Effects Of Proper Annealing Proper annealing of low-carbon steels causes a complete solu... Effect Of A Small Amount Of Copper In Medium-carbon Steel This shows the result of tests by C. R. Hayward and A. B. Joh... Testing And Inspection Of Heat Treatment The hard parts of the gear must be so hard that a new mill f... The Quenching Tank The quenching tank is an important feature of apparatus in c... Properties Of Steel Steels are known by certain tests. Early tests were more or l... Carbon Tool Steel Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham... Flange Shields For Furnaces Such portable flame shields as the one illustrated in Fig. 1... Hardening Operation Hardening a gear is accomplished as follows: The gear is tak... |
Flange Shields For FurnacesCategory: FURNACES Such portable flame shields as the one illustrated in Fig. 106 may prove serviceable before furnaces required for plate work, where the doors are often only opened for a moment at a time. This shield can be placed far enough in front of the furnace, that it will be possible to work under it or around it, in removing bulky work from the furnace, and yet it will afford the furnace tender some relief from the excessive glare that will come out the wide-opened door. To have this shield of light weight so that it may be readily pushed aside when not wanted, the frame may be made up of pipe and fittings, and a piece of thin sheet steel fastened in the panel by rings about the frame. About the most disagreeable task in a heat-treating shop is the removal of the pots from the case-hardening furnaces; these must be handled at a bright red heat in order that their contents may be dumped into the quenching tank with a minimum-time contact with the air, and before they have cooled sufficiently to require reheating. Facing the heat before the large open doors of the majority of these furnaces, in a man-killing task even when the weather is moderately cool. The boxes soon become more or less distorted, and then even the best of lifting devices will not remove a hot pot without several minutes labor in front of the doors. In Fig. 107 is shown a method of arranging a shield on one type of charging and removing truck. This shield cannot afford more than a partial protection to the body of the furnace tender, because he must be able to see around it, and in some cases even push it partly through the door of the furnace, but even small as it is it may still afford some welcome protection. The great advantage in this case of having the shield on the truck instead of stationary in front of the furnace, is that it still affords protection as long as the hot pot is being handled through the shop on its way to the quenching tank. It might be interesting to many engaged in the heat-treating or case hardening of steel parts, to make a special note of the design of the truck that is illustrated in connection with the shield; the general form is shown although the actual details for the construction of such a truck are lacking; these being simple, may be readily worked out by anyone wishing to build one. This is considered to be one of the quickest and easiest operated devices for the removal of this class of work from the furnace. To be sure it may only be used where the floor of the furnace has been built level with the floor of the room, but many of the modern furnaces of this class are so designed. The pack-hardening pots are cast with legs, from two to three inches high, to permit the circulation of the hot gases, and so heat more quickly. Between these legs and under the body of the pot, the two forward prongs of the truck are pushed, tilting the outer handle to make these prongs as low as possible. The handle is then lowered and, as it has a good leverage, the pot is easily raised from the floor, and the truck and its load rolled out. Next: Heating Of Manganese Steel Previous: Heavy Forging Practice
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