| Here is a little tangle that is perpetually cropping up in various guises. A cyclist bought a bicycle for L15 and gave in payment a cheque for L25. The seller went to a neighbouring shopkeeper and got him to change the cheque for him, and the cyclist... Read more of THE BICYCLE THIEF. at Math Puzzle.ca |  InformationalPrivacy |
Steel MakingPreventing Decarbonization Of Tool SteelIt is especially important to prevent decarbonization in such... The Forging Of Steel So much depends upon the forging of steel that this operation... A Satisfactory Luting Mixture A mixture of fireclay and sand will be found very satisfactor... Hints For Tool Steel Users Do not hesitate to ask for information from the maker as to t... Rate Of Absorption According to Guillet, the absorption of carbon is favored by ... Drop Forging Dies The kind of steel used in the die of course influences the he... Annealing Alloy Steel The term alloy steel, from the steel maker's point of view, r... The Influence Of Size The size of the piece influences the physical properties obta... Protective Screens For Furnaces Workmen needlessly exposed to the flames, heat and glare from... Manganese MANGANESE is a metal much like iron. Its chemical symbol is M... Annealing Work With the exception of several of the higher types of alloy s... Steel Worked In Austenitic State As a general rule steel should be worked when it is in the a... Impact Tests Impact tests are of considerable importance as an indication ... Hardness Testing The word hardness is used to express various properties of me... Silicon Silicon prevents, to a large extent, defects such as gas bubb... Making Steel Balls Steel balls are made from rods or coils according to size, st... Molybdenum Molybdenum steels have been made commercially for twenty-five... Introduction Of Carbon The matter to which these notes are primarily directed is the... Phosphorus Phosphorus is one of the impurities in steel, and it has been... Restoring Overheated Steel The effect of heat treatment on overheated steel is shown gra... |
Heat Treatment Of Punches And Dies Shears Taps EtcCategory: HIGH-SPEED STEEL HEATING.--The degree to which tools of the above classes should be heated depends upon the shape, size and use for which they are intended. Generally, they should not be heated to quite as high a heat as lathe tools or milling cutters. They should have a high heat, but not enough to make the flux run on the steel (by pyrometer 1,900 to 2,100 deg.F.). COOLING.--Depending on the tools, some should be dipped in oil all over, some only part way, and others allowed to cool down in the air naturally, or under air blast. In cooling, the toughness is retained by allowing some parts to cool slowly and quenching parts that should be hard. DRAWING THE TEMPER.--As in cooling, some parts of these tools will require more drawing than others, but, on the whole, they must be drawn more than water hardening tools for the same purpose or to about 500 deg.F. all over, so that a good file will just touch the cutting or working parts. BARIUM CHLORIDE PROCESS.--This is a process developed for treating certain classes of tools, such as taps, forming tools, etc. It is being successfully used in many large plants. Briefly the treatment is as follows: In this treatment the tools are first preheated to a red heat, but small tools may be immersed without preheating. The barium chloride bath is kept at a temperature of from 2,000 to 2,100 deg.F., and tools are held in it long enough to reach the same temperature. They are then dipped in oil. The barium chloride which adheres to the tools is brushed off, leaving the tools as dean as before heating. Next: A Chromium-cobalt Steel Previous: Heat Treatment Of Milling Cutters Drills Reamers Etc
Viewed 962 |
||||||||||||||||||||
