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Steel MakingApplication Of Liberty Engine Materials To The Automotive IndustryThe success of the Liberty engine program was an engineer... Chrome-nickel Steel Forging heat of chrome-nickel steel depends very largely on ... The Care Of Carburizing Compounds Of all the opportunities for practicing economy in the heat-t... The Effect The heating at 1,600 deg.F. gives the first heat treatment w... Impact Tests Impact tests are of considerable importance as an indication ... Heat-treating Department The heat-treating department occupies an L-shaped building. ... The Pyrometer And Its Use In the heat treatment of steel, it has become absolutely nece... Tool Or Crucible Steel Crucible steel can be annealed either in muffled furnace or b... Hardening The forgings can be hardened by cooling in still air or quen... Phosphorus Phosphorus is one of the impurities in steel, and it has been... The Forging Of Steel So much depends upon the forging of steel that this operation... Hardness Testing The word hardness is used to express various properties of me... Annealing Work With the exception of several of the higher types of alloy s... Vanadium Vanadium has a very marked effect upon alloy steels rich in c... Hardening High-speed Steel In forging use coke for fuel in the forge. Heat steel slowly ... Silicon SILICON is a very widespread element (symbol Si), being an es... Take Time For Hardening Uneven heating and poor quenching has caused loss of many ve... Annealing In Bone Steel and cast iron may both be annealed in granulated bone. ... Heat Treatment Of Milling Cutters Drills Reamers Etc THE FIRE.--Gas and electric furnaces designed for high heats ... Heat Treatment Of Gear Blanks This section is based on a paper read before the American Gea... |
Hardening Carbon Steel For ToolsCategory: HARDENING CARBON STEEL FOR TOOLS For years the toolmaker had full sway in regard to make of steel wanted for shop tools, he generally made his own designs, hardened, tempered, ground and usually set up the machine where it was to be used and tested it. Most of us remember the toolmaker during the sewing machine period when interchangeable tools were beginning to find their way; rather cautiously at first. The bicycle era was the real beginning of tool making from a manufacturing standpoint, when interchangeable tools for rapid production were called for and toolmakers were in great demand. Even then, jigs, and fixtures were of the toolmaker's own design, who practically built every part of it from start to finish. The old way, however, had to be changed. Instead of the toolmaker starting his work from cutting off the stock in the old hack saw, a place for cutting off stock was provided. If, for instance, a forming tool was wanted, the toolmaker was given the master tool to make while an apprentice roughed out the cutter. The toolmaker, however, reserved the hardening process for himself. That was one of the particular operations that the old toolmaker refused to give up. It seemed preposterous to think for a minute that any one else could possibly do that particular job without spoiling the tools, or at least warp it out of shape (most of us did not grind holes in cutters 15 to 20 years ago); or a hundred or more things might happen unless the toolmaker did his own hardening and tempering. That so many remarkably good tools were made at that time is still a wonder to many, when we consider that the large shop had from 30 to 40 different men, all using their own secret compounds, heating to suit eyesight, no matter if the day was bright or dark, and then tempering to color. But the day of the old toolmaker has changed. Now a tool is designed by a tool designer, O.K.'d, and then a print goes to the foreman of the tool department, who specifies the size and gets the steel from the cutting-off department. After finishing the machine work it goes to the hardening room, and this is the problem we shall now take up in detail. Next: The Modern Hardening Room Previous: Restoring Overheated Steel
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