Hardening And Tempering Engineers Tools

Description

Author: George Gentry, Edgar Westbury

Publisher: Argus Books Ltd

Date: 1977

ISBN: 0852427873

Introduction:

THE efficiency of cutting tools employed in engineeringandother
craftsdependsvery largely on their correct heat treatment. The
use of carbon steelsisstill predominant and,although themethods
ofhardeningand tempering such toolsis relatively simple and
straightforward, there are many usersof these toolswhoruninto
difficulties whenattempting to harden andtemperthem.

In thepast, themethodsemployedin these processes haveoften
beengovernedmainly by rule ofthumb, and experienced tool
makers have often evolved individual methodswhichhavebeenin
somecases closelyguardedas trade secrets. Reliable practical
information on thesubjecthas beendifficult toobtain. There is,
however, no reason why even the novice should not be ableto
harden andtempertoolsquite successfully by adopting simple
methods which can be applied without the needforelaborate
equipment.
Since theoriginal edition ofthis book by George Gentry was
publishedover 30 yearsago, severallater editions have included
information on current trends in tooltechniqueand metallurgy to
keepitfullyupto date withmodern practice,while still concentrating
on basicrequirements of the smallWorkshop.In thepresentedition
the chapter on case-hardeninghasbeen completely re-written, with
more fully detaileddescriptionof thelatest processes, materials and
equipment; alsonew information on gas hardening,nitridingand
flame hardening.Other additions includereference to methods of
measuring hardness, and details of gasand electric furnaces of atype
suited to the small workshop,technical school,laboratoryorfactory.

Althoughtool bits and Welded tips have largelysuperseded forged
toolsfor lathes and other machines, the chapteron forging has been
retained,because itisveryusefulfor every toolmaker toknow how
toshapesteel by hot working under the hammer. It simplifies the
production of many tools which do not conformwithorthodoxshape,
and often effects considerableeconomy in costlytool steel. But the
heattreatment of modern high-speedsteeltools,and tippingof
tools with superhard metals such as tungsten carbide, hasnot been
neglected. In view of the increasing use oftheCentigradetempera-
ture scale, this has been used, together with equivalentFahrenheit
figures inmost heating statistics.

Although the principles ofhardeningandtemperingdo not change,
exceptin respect ofsuch new materials as are introducedin the
course of metallurgical progress, these processes maybesimplified,
and successisrendered more certain,by taking full advantage of
the modern appliances for heattreatment.

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