| The assembling of the Second Session of the Thirty-ninth Congress may very properly be made the occasion of a few earnest words on the already much-worn topic of reconstruction. Seldom has any legislative body been the subject of a solicit... Read more of RECONSTRUCTION at Martin Luther King.ca |  Informational.caPrivacy |
Steel MakingTemperature Recording And RegulationEach furnace is equipped with pyrometers, but the reading an... Temperatures To Use As soon as the temperature of the steel reaches 100 deg.C. (... Manganese Manganese adds considerably to the tensile strength of steel,... S A E Heat Treatments The Society of Automotive Engineers have adopted certain heat... Hardening Steel is hardened by quenching from above the upper critical.... Typical Oil-fired Furnaces Several types of standard oil-fired furnaces are shown herew... Standard Analysis The selection of a standard analysis by the manufacturer is t... The Packing Department In Fig. 56 is shown the packing pots where the work is packe... Preventing Decarbonization Of Tool Steel It is especially important to prevent decarbonization in such... Hardening High-speed Steels We will now take up the matter of hardening high-speed steels... Silicon SILICON is a very widespread element (symbol Si), being an es... Quenching The Work In some operations case-hardened work is quenched from the bo... Flange Shields For Furnaces Such portable flame shields as the one illustrated in Fig. 1... William Kelly's Air-boiling Process An account of Bessemer's address to the British Association w... The Leeds And Northrup Potentiometer System The potentiometer pyrometer system is both flexible and subst... Pyrometers For Molten Metal Pyrometers for molten metal are connected to portable thermoc... Carburizing Material The simplest carburizing substance is charcoal. It is also th... Protectors For Thermo-couples Thermo-couples must be protected from the danger of mechanica... The Effect Of Tempering On Water-quenched Gages The following information has been supplied by Automatic and ... High-carbon Machinery Steel The carbon content of this steel is above 30 points and is ha... |
Tempering Round DiesCategory: HARDENING CARBON STEEL FOR TOOLS A number of circular dies of carbon tool steel for use in tool holders of turret lathes were required. No proper tempering oven was available, so the following method was adopted and proved quite successful. After the dies had been hardened dead hard in water, they were cleaned up bright. A pair of ordinary smiths' tongs was made with jaws of heavy material and to fit nicely all around the outside of the die, leaving a 3/32-in. space when the jaws were closed around the die. The dies being all ready, the tongs were heated red hot, and the dies were picked up and held by the tongs. This tempered them from the outside in, left the teeth the temper required and the outside slightly softer. The dies held up the work successfully and were better than when tempered in the same bath. Next: The Effect Of Tempering On Water-quenched Gages Previous: Shrinking And Enlarging Work
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