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Steel MakingHardness TestingThe word hardness is used to express various properties of me... Quality And Structure The quality of high-speed steel is dependent to a very great ... Annealing Method Forgings which are too hard to machine are put in pots with ... Chromium Chromium when alloyed with steel, has the characteristic func... 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... Hardening Operation Hardening a gear is accomplished as follows: The gear is tak... Cutting-off Steel From Bar To cut a piece from an annealed bar, cut off with a hack saw,... Hardening Steel is hardened by quenching from above the upper critical.... Correction For Cold-junction Errors The voltage generated by a thermo-couple of an electric pyrom... Hints For Tool Steel Users Do not hesitate to ask for information from the maker as to t... Uses Of The Various Tempers Of Carbon Tool Steel DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres... Effects Of Proper Annealing Proper annealing of low-carbon steels causes a complete solu... Fatigue Tests It has been known for fifty years that a beam or rod would fa... William Kelly's Air-boiling Process An account of Bessemer's address to the British Association w... Protectors For Thermo-couples Thermo-couples must be protected from the danger of mechanica... Tempering Colors On Carbon Steels Opinions differ as to the temperature which is indicated by t... Tool Or Crucible Steel Crucible steel can be annealed either in muffled furnace or b... Cyanide Bath For Tool Steels All high-carbon tool steels are heated in a cyanide bath. Wi... Air-hardening Steels These steels are recommended for boring, turning and planing... Open Hearth Process The open hearth furnace consists of a big brick room with a l... |
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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