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Dec. l0, 19416.
Filed Nov. 27, 1942
6 Sheets-Sheet 2
OGGI bH “UL-'11
Dec. l0, 1946.
Filed Nov. 27, 1942
6 Sheets-Sheet 4
fr.. l rmfnuo.
Dec. 10, 1946.
Filed Nov. 27, 1942
6 Sheets-Sheet 5
Dec. 10, 1946.
A. |_. HARTLEY -
Filed Nov. 2"?, 1942
e sheets-sheet e
Patented Dec. 10, 1946
Albert L. Hartley, Cincinnati, Ohio, assignor to
The R. K. Le Blond Machine Tool Company,
Cincinnati, Ohio, a corporation ol' Delaware
Application November 27, 1942, Serial No. 467,119
5 Claims. (Cl. 266--4)
This invention pertains to flame hardening ap
paratus and is particularly related to such appa
ratus adapted to the flame hardening of rela
tively long small diameter holes in work pieces.
'I'his invention is specifically adapted to such
types of Work as hardening the tapered bores in
flame hardening apparatus shown on the line
III-_III in Figure I.
Figure IV is a plan view of the flame hardening
burner having a relatively long tapered extension
portion for entrance into the bore of the work
piece to be flame hardened.
Figure V is an end elevation of the flame hard
ening burner of Figure IV particularly showing
the fluted portion to permit escape of the burned
gases during the heating process and which also
spindles for lathes or the like.
In flame hardening a relatively long small di
ameter bore in a work piece certain specific prob
lems come about which are not present when
exterior surfaces of work are to be flame hard
ened. One of the most difficult problems involved
in the hardening of a hole in a Work piece of this
character is that of applying a suitable flame
hardening torch in the bore so as to uniformly
and rapidl
n internal
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while at the same time proymìgingnsuitable dis
chd‘f'gî'îäïmays in tñë‘torgh _tg_gereinigttfree
esca‘lñ'cTf'-t-.'l'i'ë"lî?iiriied"gase“‘”"`M '
serves to provide access for the coolant nozzle
when presented to the bore upon withdrawal of
the flame hardening torch or burner of Figure IV.
Figure VI shows a side elevation of the burner
of Figure IV.
Figure VII is a plan View of the coolant nozzle
associated with the flame hardening burner which
is inserted into the bore of the work piece being
flame hardened while at the same time the burner
ingcpïöcìì‘s‘raffït en the difficult problem of 20 is removed therefrom, so that coolant may be
thoroughly distributed in the bore of the work
piece without the formation of steam pockets or
eddy currents which might otherwise be the case
ening torch has brought the surface to the proper
when cooling is undertaken in the presence of the
temperature for quenching. This again necessi
tates the peculiar handling of the ñame harden 25 flame hardening burner.
Figure VIII is an end view of the coolant nozzle
ing apparatus in that the flame hardening torch
showing its association with the flame hardening
must be rapidly withdrawn from the bore of the
applying the quenching coolant to the work sur
face substantially instantly after the flame hard
work piece andthe coolant discharging nozzle
Figure IX is a side elevation of the coolant
promptly inserted therein and’coolartkapplied 30 nozzle
of Figure VII.
tßlllgdieatedsurfacasdaìto @Seminarraum
Further features and advantages of this inven
tion will appear from the detailed description of
the drawings in which:
Figure X shows the relationship of the exterior
flame hardening torches for simultaneously flame
hardening the outside tapered portion of the work
spindle While the bore is being flame hardened.
Figure XI is a view shown on the line XI-XI
of Figure I, of the flame hardening torches sur
rounding the cylindrical portion of the work spin
dle for hardening the back portion of the clamp
ing flange of the work spindle simultaneously
40 with the hardening of the bore and exterior ta
pered surface thereof.
Figure I is a side elevational View of the bore
flame hardening apparatus shown applied to a
typical lathe spindle shown in fragmentary sec
flame hardening torches applied to flame harden
ing the rear portion of the clamping flange of
l u
¢ .
. - . ' ..
All of these operations must be undertaken in
a coordinated and accurately controlled manner
so as to permit the proper functioning of the
flame hardening process in the bore of the Work
Figure XII is a side view of one of the arcuate
tion together with additional flame hardening 45 the spindle.
torches applied to completely finish flame hard
Figure XIII is a section thru one of the flame
ening the outside diameter at the same time the
bore is being hardened.
Figure II is a transverse vertical section on the
line II-II of Figure I particularly showing the
roller reciprocating slide and actuating air cyl
lnder for alternately presenting the flame hard
ening torch or the coolant nozzle to the bore to
be flame hardened.
Figure III is a front elevational view of the
hardening burners of Figure XI on the line
XIII-XIII of said figure.
For exemplary purposes this invention is shown
applied to a typical lathe spindle W having the
usual relatively long small diameter taper bore I
which is to be flame hardened so as to prevent
damage and scoring of this bore with the inser
tion or withdrawal of Various lathe fixtures such
55 as the centers, collets, etc. The apparatus com
prises a main body portion 2 which is suitably
ing mounted on it the mounting flange portions
mounted to a fixed frame 3 of a flame hardening
38 and 39 of the coolant cylinder. In this par'
ticular arrangement this coolant nozzle comprises
a series of three parallel water tubes 40, 4I, and
42, which respectively lie parallel to and in the
machine (not shown) by appropriate bolts 4.
In this frame 2 is slidably mounted a pair of re
ciprocating carriages 5 and 6 having rollers 1 op
erating in appropriate slots 8 formed in the frame
2. On the upper carriage 5 is fixed a bracket 9
to which is appropriately ñxed a piston rod I0
of a reciprocating gear cylinder Il appropriately
mounted on the surface l2 of the frame 2 by
bolts I3 so that reciprocation of the piston rod
III through the medium of its piston (not shown)
in the cylinder II eiîects sliding reciprocation
movement of the carriage 5 back and forth with
its rollers 1 operating in the slots 8 in the frame 2.
The lower carriage 6 is likewise reciprocated by
respective fluted portions 33, 34, and 35 of the
flame hardening burner 23 as best seen in Fig
ures III and VIII. These tubes are connected
by appropriate portions 43, to a manifold portion
39 having the-input passageway 44 by which
quenching fluid may be applied to the tubes 40,
4I, and 42 which outlets 45 permit the fluid to
spray rapidly and without eddy currents or steam
pockets being formed upon the work surface hav
ing been previously heated by the burner 23.
Thus, referring to Figure I, the operation of
this apparatus comprises ñrst presenting the
through the medium of a pinion I4 carried on
burner 23 as shown in Figure I, igniting the oxy
acetylene mixture coming in through the mixing
an appropriate stud I5 and which engages a
rack I6 on the carriage 5 and a rack I1 on the 20 arrangement and torches 22 and through the fit
carriage 6 so that when the carriage 5 is moved
tings 24 into the burner 2.3 and continuing the
to the right, for example, in Figure I the car
heating of the bore I of the work spindle W until
riage 6 will similarly be moved to the left in this
it has arrived at its flame hardening tempera
figure. Gear I4 carried on the shaft I5 may be
ture. Immediately upon arriving at this critical
withdrawn from operative position with the racks 25 temperature the air cylinder and its piston rod
the cylinder in opposite reciprocatory motion
I8 are operated to substantially instantly with
I6 and I1 or for re-engaging them in diiïerent
relative positions to effect different relative po
draw the burner 23 telescopically past the cool
sitioning of carriage 5 with carriage 6, by means
ant nozzle comprising the tubes 40, 4I, and 42
of the operating knob I8, Figure II, which is
which movement, through the medium of the
connected to this shaft I5 and which may move 30 gear I4 and associated racks I8 and I1, causes
it axially to the right to disengage the gear I4
the nozzle to be immediately inserted into the
from the racks I6 and I1. Appropriate detent
bore upon full withdrawal of the flame harden
ing burner 23. Coolant is then instantly turned
means I8 serves to position the shaft I5 either
on through this nozzle to quench the bore of the
with gear I4 engaged with the racks I6 and I1
or disengaged therefrom. In the latter case this 35 Work piece to flame harden the work in a. com
pletely automatic cycle. In this way the escap
ing gases, during the heating operation may be
passed through the iluted portions 33, 34, and 35
of the ñame hardening burner 23 and these areas
On a bracket 20 ñxed to the cariage 5 by ap 40 may also be utilized to permit quick entrance of
is desirable when it is not necessary to opposite
ly reciprocate the carriagel 5 with respect to the
carriage 6 as in other types of flame hardening
the coolant nozzle into the bore upon Withdrawal
ening torches 22 of conventional design to which
of the flame hardening burner 23 so that the
is connected the special llame hardening burner
coolant may be thoroughly distributed in the
bore of the Work piece to quench it without in
23 through suitable connections 24. This burner
23 is best shown in Figures IV, V, and VI and 4. terference and the creation of eddy currents or
comprises a connecting portion 23a having the
steam pockets which would otherwise occur where
the flame hardening burner remains in position
input line 25 through which enters the mixture
in the bore during the quenching operation. It
of oxygen and acetylene which is conducted
through the passageways 25 and 21 to the jet
is to be further understood, of course, that dur
openings 28 as best shown in Figure V. Cool 50 ing both the heating and the quenching opera
tions the Work piece W is rotated at an appro
ant watel` enters the portion 23a of the burner 23
priate speed to effect the proper flame hardening
through a passageway 28 and through the pas
sageways 38 and 3| and discharging out the pas
of the bore I.
sageway 32 outside the bore of the workpiece
It is to be -further noted that additional llame
being hardened. This coolant traversing these 55 hardening burners 46 may also be carried on an
appropriate bracket 41 fixed to the frame 2 to
passageways is for the purpose of keeping the
effect the flame hardening of the outer tapered
tapered portion 23h of the flame hardening burn-surface 48 of the spindle W at the same time
er 23 properly cooled during the operation. This
the bore portion is being hardened if such an
coolant, however, is not used for quenching the
work surface after it has been brought up to 60 arrangement be desired. In this instance four
flame hardening temperature. The ñuted design
such torches 46 would be utilized as shown in
propriate screws 2l are mounted the flame hard
of this burner comprises the grooved portions 33,
Figure X, each with appropriate mixer tubes 43
34, and 35 which serve the dual function of first
connected to torches similar to that of the torch
permitting free escape of the burned gases issu
22. In this case, however, since- it is an external
ing from the jet openings 28 and also serve as ac 65 surface, the quenching water is caused to play
upon the work from appropriate outlet jets 50
cess openings by which the coolant- nozzle ar
after the flame hardening surface has been com
rangement of Figures VII, VDI, _and IX may be
pleted by the jets 5I in the conventional fashion
readily entered into the bore of the work piece
for such type of ñamehardening operation.
while at the same time permitting rapid with
As may be also noted appropriate burners 52
drawal of the llame hardening burner from the 70
bore after the Work piece has been brought to the
as shown in Figures XI, XII, and )GII may be
proper flame hardening temperature.
utilized to effect the hardening of the rear ñange
portion 53 of the work spindle W also carried on
This coolant nozzle arrangement is mounted on
simultaneously with both the hardening of the
the lower carriage 6 by means of a bracket 36
connected to it by appropriate screws 31 and hav 75 bore and of the tapered portion 48 of the work
spindle. This arrangement of the burners 52 are
formed arcuately so their coniiguration ñts
around the work spindle W and the coolant water
is applied after the work has been heated to
flame hardening temperature by the torches
through the medium of water jets in the torch
mounted on a slide for movement into a bore to
be flame hardened in a work piece, a quenching
coolant nozzle mounted on another slide for
presentation into said bore, common rack and
pinion actuating means for oppositely recipro
cating said slides, longitudinally extending
grooves formed in said burner to facilitate dis
posal of burned gases during the operation of
said burner and to at the same time provide
or any other outside means for applying this cool
ant to the surface `‘53 after it has been appropri
ately heated.
Having thus fully set forth and described my 10 passageways for the insertion of said nozzle in
said bore during the presence of said burner
therein, and means for disengaging said common
Ñcure by United States Letters Patent is:
rack and pinion driving means to allow inde
#A 1. InV _aw ñame hardeninngwapp‘a‘gatuus, a longi
pendent movement of said slides.
j'ectableántoma'mbore to bemiiamgwhlarfd vl~\`dmimr‘_1_~a 15 4. In a llame hardening apparatus, a main
body portion, a pair of slides mounted on said
body portion, a iiame hardening burner mount
tudinally arrang'ëdïöîìí?ësentatiouintosaidhqge
invention what I claim as new and desire to se
ed on one of said slides, a quenching coolant noz
said'bïi?ñerî"and"iiiövable mounting means for
"'“rîöz‘zl'ëïmand common means for re
zle mounted on the other of said slides, disen
20 gageable rack and pinion means for simultane
ously oppositely reciprocating said slides or to
ciprocating said respective mounting means so
allow independent movement of said slides, pas
as to alternately insert said burner or said nozzle
sageways formed on said burner to allow escape
into the bore of said work piece, said burner and
of burned gases during the operation of said
nozzle being telescopically inter-related so that
burner in the bore of said work piece, said pas
said coolant nozzle may be inserted into said
sageways being arranged to allow said coolant
bore of said work piece while said burner is be
nozzle to be disposed circumferentially about
ing removed therefrom, said telescopic associa
said burner within the confines of the bore of
tion of said burner and nozzle comprising longi
said work piece so that said burner and nozzle
tudinally extending pasasgeways in said burner
‘may be alternately or simultaneously inserted in
serving to provide escape for the burned gases 30 said bore by axial movement of said burner and
when said burner is in operation in said bore and
nozzle by said slides.
further serving to permit said cdolaniì nozzlmtn
5. In a ñame hardening apparatus, the com
nto the bore of said workugiece whmihle
bination of a main body portion, a pair of slides
said nozzle is being withdrainxfrt‘lì'e‘iíëìrhm.u
35 reciprocatably mounted on said body portion, rack
~~~wzrríïme~harceñîíg apparatus for hard
ening an elongated small diameter bore in a
work piece, an elongated flame hardening burn
er, an elongated coolant nozzle, a pair of 0p
positely reciprocatable slides for alternately or
simultaneously presenting said burner and nozzle
in the bore of said work piece, rack and pinion
means for reciprocating said slides, means for
disengaging said rack and pinion means for in
dependent movement of said slides, and longitu
dinally extending passageways formed on the
exterior of said burner for the escape of burned
gases during the operation of said burner in said
bore and to allow simultaneous insertion of said
nozzle and burner in said bore.
3. In a iiame hardening apparatus, a longi
tudinally extending flame hardening burner
and pinion means for oppositely reciprocating
said slides, means for disconnecting said rack
and pinion mechanism for independent move
ment of said slides, a flame hardening burner
mounted on one of said slides, a quenching cool
ant nozzle mounted on the other of said slides,
in telescopic relationship with said burner, and
passageways formed in said burner extending
longitudinally thereof and axially of the bore to
be flame hardened in the work piece, said pas
sageways serving to both facilitate disposal of
burned gases during the operation of said burner
and to allow the simultaneous or independent in
sertion of said burner and nozzle in said bore of
the Work piece.
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