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Steel MakingThe Modern Hardening RoomA hardening room of today means a very different place from ... Crucible Steel Crucible steel is still made by melting material in a clay or... Manganese Manganese adds considerably to the tensile strength of steel,... The Forging Of Steel So much depends upon the forging of steel that this operation... Knowing What Takes Place How are we to know if we have given a piece of steel the ver... Hardening The forgings can be hardened by cooling in still air or quen... For Milling Cutters And Formed Tools FORGING.--Forge as before.--ANNEALING.--Place the steel in a ... Air-hardening Steels These steels are recommended for boring, turning and planing... Composition And Properties Of Steel It is a remarkable fact that one can look through a dozen tex... Rate Of Absorption According to Guillet, the absorption of carbon is favored by ... Leeds And Northrup Optical Pyrometer The principles of this very popular method of measuring tempe... Hardening High-speed Steel In forging use coke for fuel in the forge. Heat steel slowly ... The Packing Department In Fig. 56 is shown the packing pots where the work is packe... Heating Of Manganese Steel Another form of heat-treating furnace is that which is used ... Preparing Parts For Local Case-hardening At the works of the Dayton Engineering Laboratories Company, ... Fatigue Tests It has been known for fifty years that a beam or rod would fa... Phosphorus PHOSPHORUS is an element (symbol P) which enters the metal fr... Tempering Round Dies A number of circular dies of carbon tool steel for use in too... Heat Treatment Of Lathe Planer And Similar Tools FIRE.--For these tools a good fire is one made of hard foundr... Lathe And Planer Tools TO FORGE.--Gently warm the steel to remove any chill is parti... |
Carburizing Low-carbon SleevesCategory: HEAT TREATMENT OF STEEL Low-carbon sleeves are carburized and pushed on malleable-iron differential-case hubs. Formerly, these sleeves were given two treatments after carburization in order to refine the case and the core, and then sent to the grinding department, where they were ground to a push fit for the hubs. After this they were pushed on the hubs. By the method now employed, the first treatment refines the core, and on the second treatment, the sleeves are pushed on the hub and at the same time hardened. This method cuts out the internal grinding time, pressing on hubs, and haulage from one department to another. Also, less work is lost through splitting of the sleeves. The machine for pushing the sleeves on is shown in Fig. 64. At A is the stem on which the hot sleeve B is to be pushed. The carburized sleeves are heated in an automatic furnace, which takes them cold at the back and feeds them through to the front, by which time they are at the correct temperature. The loose mandrel C is provided with a spigot on the lower end, which fits the hole in the differential-case hub. The upper end is tapered as shown and acts as a pilot for the ram D. The action of pushing on and quenching is similar to the action of the Gleason tempering machine, with the exception that water instead of oil is used as a quenching medium. The speed of operation depends on a number of variables, but from 350 to 500 can be heated and pressed on in 11 hr. Next: Cyanide Bath For Tool Steels Previous: Hardening Operation
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