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Патент USA US2403761

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July 9, 1946.
€ ‘ A. E. SHORTER » I
I 2,403,761‘
Filed May 28, 1942
Patented July 9, 17946" c
v 2,403,761
' v
APPARATUS, 'FoRf' HEAT-inguinal INTER- '
Albert EdwardgShlorter, Shei?eld,; England, ‘as-i
»,: - -,
signori to TheLinde Air Produetsrcompany, New- I' ,'
York’.lilY-laserlm?fm #911392
f .
Application May 28, l§:12~,iSerialNo.444,804 :
v~.In‘Great.‘Britain June 4, 1941
' f4 ciaiai's'ficl.152F274)
This invention relates to apparatus for the_ heat
-' inwardly into the
burner head. Hi from the end
surfaceremote from the quenching unit- [2; and
communicating with the ‘distributing chamber
treatment of internal'metal surfaces and e519?‘
cially to apparatus for the surface hardening of j
such surfaces by theapplication .of high temper»
ature heat followed by quenching.
2|, are a_.-plurality of :longitudinal gas passages
, 24-,symmetrically disposed with respect to the
It is an object of this invention to'provide ap-_
paratus by which internal metal surfaces of .relg
atively small diameter, such as‘ internal bearings,
central v longitudinal; axis. > -.From each passage
24.; there extends a series- of the radial gas out
lets vvI whichrareipreferably arranged with the
outlets-of onerowstaggered with respect to those
may be uniformly treated; to provide such appar,
ratus by which all portions of. the internal sur?
of an adjacent row. The rows of gas outlets H
face may be heated simultaneously, and. a heat-; “preferably cover in the longitudinal direction a
ing unit adequately cooled‘; to provide apparatus.
distance slightly less than the length of the vbore
for treating internal metal surfaces by which,
to be treated, so that the terminal jets at each
high temperature heating ?ames are directed;
end do not impinge on-the edge of the bore but
against such a surface and an auxiliary, combusT
‘ a short distance from the edge, thereby prevent- ‘
tion-supporting medium is supplied to such.
?ames; to provide such apparatus which includes,
' ingoverheating. ofthe edge which is heated'sub
stantially .solelylbywconduction. To reduce the
tendency to back?re, each longitudinal gas pas
sage ,2-4, preferablytapers inwardly‘from. the open‘
a heat treating‘device which is accurately _'loc_at_-,-v
ed and guided during theheat treating-opera
tion; to provide forla relative rotationalv moves
endas shown-in Fig.7‘ 2. The burner head H3 is
ment between the heat treating_'devi'ce; andthe:
work during such treatment‘, "andwto produce;
preferablytmade of highly heat conductive metal -
such as copper in'iorder that heat may readily be
transmitted to the cold ?uid which is passed
more uniform heating and quenching. Other ob
jects'and the novel features-of this invention'will:
through the conduit [4.
become apparent from the following; description‘
and accompanying drawinghin which: .
Fig. 1 is a sectional elevation of the preferred’.
form of heat treating device. _
Fig. 2 is a transverse section taken along-the"
line 2-2 of' Fig. 1.
vthe heat'treating device is primarily designed to
operate, the-conditions for combustion may not
be ideal and inorder to facilitate combustion,
means. may be ‘provided for leading an auxiliary
combustion-supporting medium to the combus
Fig. 3 is a sectional elevation,villustrating_a
modi?ed form of heat treating'device, in oper
ative position with respect to a surfaceto
In,viewv of the con?ned space within which‘
tion zone. This means may ‘consist of longitu
dinally extending passages substantially entirely
be .
within the burner head, along which air as the
The heat treating device D<comprisels, injcomlf
‘pass. by induction to the combustion zone. ‘As
heat treated.
bination, a burner head ‘l0 adaptedto be locat
ed in juxtaposition with respectivto [the surface.
and having longitudinal gas passages therein
with'radial gas outlets H by which-hightemper
auxiliary combustion-supporting medium may
shown-in Fig; 2,'a' plurality of separate channels
26 may be provided in the burner head'terminat
ing in;outlets orfori?ces;‘Zl'interspersed among '
the gas outlets, these separate channels 26 be
ature heating ?ames may be applied to the sur_.- . 41); mg supplied with air or other oxidizing gas. For
face, so as to heat the whole of the‘ surface si
"this purpose, avpipe 28,'adaptedto be connected
multaneously; a quenching unitfl2‘,'co-axialwith to an: auxiliary supply of combustion supporting
the burner head and having. radial ?uidzldisg»,
gas such as air, extends through the chamber it
charge outlets l3; and a conduit M forvthe sup- 7
from- the upper end thereof and divides into two
ply of fluid to the'quenching unit, the conduit 45 ,tubes 2,91which lead to' channels 26 each vhaving
extending through the burner head and acting 7'; a series of radial discharge outlets 21.
as a thermal conductor to transfer‘heat from ,the _,
burner head to the ?uid passing to. the. quench
ing unit,
Referring to Figs. 1 and 2, for details of the
treating device D, the burner head H3 is ‘secured,
as by welding or brazing, to a gas distributing
chamber 2| having an inlet 22 adapted to be
connected to a pipe 23 supplying gaseous fuel;
such as an oxy-acetylene mixture. Extending 55
The. ?quenching unit l2¥comprises a chamber
30' closed at the end'remote fromithe- burner head
H) by aremovable plug 3| ‘which permits ready
access to the chamber 30 for cleaning purposes.
A quenching medium, such as water, is supplied
to chamber 30 from conduit I4, supplied by a tube
or pipe 32 which extends through chamber 2!
to the upper end of conduit M. In the wall of
the chamber 30 are formed the radial outlets l3
for discharging the quenching medium.
outlets are preferably arranged in rows which
extend over a distance at least equal to the'length
of the bore to be treated so as to insure thorough
quenching of the whole of the heated surface.
In operation, the inlet pipe 23 is connected to
l2, and by mounting the guide member 38 so
that the aperture therein is also located centrally
with respect to the burner head l0 and quenching
unit II, the heat treating device may be ac
curately mounted within the bore and guided
during the movement from the heating to the
a supply fuel of gas or suitable combustible mix
ture, the pipe 32 to a supply of cold ?uid, and
The structural details of the heat treating de
vice described above are given by way of example
only and may obviously be modi?ed without de
parting from the invention as de?nedin the ap
the pipe 28 to a source of compressed air or other
combustion-supporting gas.
The heating jets
issuing from the burner ori?ces I l are lighted and
pended claims.
the heat treating device thereupon inserted in
‘What is claimed is:
the bore to be treated, the whole of the ‘bore
l. A device for heat treating an internal sur
being heated simultaneously. After a predeter
mined time interval, su?icient for the surface of 15 face of a hollow metal article, comprising a
burner head adapted to be inserted within the
the bore to be raised above its critical tempera
article and having a plurality of longitudinally
ture, the heat treating device is moved longi
extending rows of transversely extending outlets
tudinally so as to withdraw the burner head Hi
for directing high temperature heating ?ames
from its operative position and simultaneously to
move the quenching unit 12 into the bore to 20 against said surface; and passages terminating
in longitudinallyextending rows of transversely
quench the heated surface.
extending outlets between adjacent pairs of said
During the whole operation, the cooling ?uid
outlet rows, for supplying an auxiliary combus
supplied to conduit 14 passes through the heat
tion supporting gas to said heating ?ames. ‘
treating device and when the burner ‘head Hl'is
in operative position, the spraying of the ?uid 25
2. A device for heat treating an internal sur
through the quenching ori?ces I3 serves solely
face of a metal article, comprising a burner head
adapted to be inserted within the article and
to cool the ?uid which has become heated during
having a plurality of annularly spaced longitudi
its passage through the burner head 10 and which
nally extending combustible gas passages therein
may be collected and re-used. When the quench
ing unit I2 is in operative position in the bore, 30 terminating in longitudinally extending rows of
the burner jets are preferably extinguished so
transversely extending outlets for directing high
that the cooling ?uid reaches the quenching unit
temperature heating ?ames against said surface;
12 very nearly at the supply temperature and
and longitudinally extending passages substan
therefore serves as a more e?‘lcient quenching
tially entirely within the burner head between
85 adjacentv pairs of said combustible gas passages
and opening laterally between said rows of out
When a succession ‘of articles are ‘to be treated,
lets for supplying an auxiliary combustion sup
each having one or more bores to be ‘hardened,
it is of advantage to mount the articles in turn
porting gas to said heating ?ames.
in a chuck or other rotatable supporting means
3. A device for ‘heat treating an internal sur
and an apparatus for the heat treatment of a “ face of a metal article comprising a burner head
bearing surface will now be described ‘by way of
adapted to be inserted within the article and
having a plurality of symmetrically disposed lon
example with reference to Fig. 3.
gitudinally extending combustible gas passages
A bearing member 35 having a central bore or
therein terminating in transversely disposed out
bearing surface 36 to be hardened is mounted
in a chuck, the jaws .31 only of which are shown. (5 lets for directing high temperatureheating ?ames
The chuck is rotatable about the central longi
against said surface; a plurality of symmetrically
disposed longitudinally extending passages ‘sub
tudinal axis of the bore and a heat treating de
vice constructed as shown in Fig. 1 is mounted
stantially entirely within the burner head each
Within the bore. The details of the heat treat
located between an adjacent pair of combustible
ing device bear the same reference numerals as
gas passages and opening between said rows of
in Fig. 1 and require no further description. The
outlets for supplying an auxiliary combustion
supporting gas to said heating ?ames; and a cen
tral longitudinal passage at least coextensive with
chuck is rotated so that the surface 36 may ‘be
uniformly heated by the heating ?ames emitted
from the outlets H and when the surface has
attained the critical temperature, the heat treat
ing device is moved so as to withdraw the burner
head ID from the bore and move :the quenching
unit I2 into the position occupied previously by
the burner head.
In order that the device may be speedily and
accurately mounted within the bore suitable lo-'
eating means may be provided. As shown in
Fig. 3, the locating means may comprise a guide
said rows of combustible gas outlets for the pas
sage of cooling ?uid to cool said burner head.
4. A device for heat treating an internal sur
face of a metal article, comprising a burner head
adapted to be inserted within the article and
having a plurality of symmetrically arranged lon
gitudinally extending rows of transversely ex
tending outlets for directing high temperature
heating ?ames against said surface so as to heat
substantially the whole of said surface simul
taneously; and longitudinally extending passages
ception of a guide pin '39 projecting from the 66 substantially entirely within theburner head be
member 33 having a, central aperture for the re
plug 3|’, which serves as a closure member for
tween adjacent pairs of said rows on opposite
the quenching chamber 30. The central longi
tudinal axis of the guide pin 39 is coincident with
that of the burner head I!) and quenching unit
sides of said burner for supplying an auxiliary
combustion supporting gas to said heating flames.
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