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Патент USA US2411699

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Nov. 26, 1946.
H. E, soMEs
2,411,699
BLANK FOR INDUCTION HEATING HEADS
Filed Dec. 30, 1943
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ATTORNEY
Nov. 26, 1946.
2,41` 1,699
H. E. SOMES
BLANK FOR INDUCTION HEATING HEADS
Filed Dec. 30. 1943
3 Sheets-Sheet 2
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Howard E. Somes’
INVENTOR
5%
ATTORNEY
Nov. 26, 1946.
H. E. soMEs
2,411,699
BLANK FOR INDUCTION HEATING HEADS
Filed Dec. 30. 1943
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3 Sheets-Sheet 3
Patented Nov. 26, 1946
2,411,699
UNITED STATES PATENT OFFICE
2,411,899
BLANK FOR INDUCTION HEATING HEADS
Howard E. Somes, Detroit, Mich., assigner, by
1
mesne assignments, to The Budd Company,
Philadelphia, Pa., a corporation of Pennsyl
vania
Application December 30, 1943, Serial No. 518,181
4 Claims. (C1. 29-190)
2
This invention relates to induction heating
heads and their manufacture, andan obiect is to
Fig. 5 is a view similar to Fig. l illustrating a
different head construction produced by this in
standardize the manufacture of what has hereto”
fore always been n specialized and relatively
vention;
Fig. B is a section through a heating head blank
costly operation.
The electromagnetic induction heating of in
employed in making the head oi Fig. 5;
Fig. 7 is a view similar to Figs. 1 and 5 illustrat
ing a still different head construction produced by
this invention;
terior surfaces such, for example, as the inner
walls of cylinders, tubes, hubs', and the like. usu
ally requires a head consisting oi' a coil support
Fig. 8 is a sectional view of the blank employed
ing mandrel on which a suitable core is mounted 10 in making the head of Fig. 7, and
and a heating coil wound around the cord. An
Fig. 9 is a section on the line 9--9 of Fig. 8.
electric current conducting arbor is connected
to and supports the mandrel, the mandrel and
In the present invention a heating head blank
is formed by separate arbor and mandrel torm
arbor members being electrically insulated from
ing members which are connected together in
each other. One terminal of the mandrel-sup 15 substantial axial alignment by electrical insulat
porting coil is connected to the arbor member,
ing material interposed between and connecting
while the other terminal is connected to the man»
together the two members, Interlocking surfaces
drei. The mandrel and arbor members are, in
are formed between the two members and the
turn, electrically connected to conductors lead
insulation so as to form a rigid unitary blank
ing to the opposite sides oi a transformer coil for
supplying heat inducing current to the working
structure. The arbor and mandrel forming mem
bers are constructed and arranged to be shaped
any required size and configuration to a de
coil on the mandrel.
Inasmuch as the heating operation in which
the heating head is employed usually requires a
sired nnished head by conventional machining
operations, to adapt the mandrel for supporting a
relatively close clearance between the heating 25 suitable coil and core, and to adapt the arbor
coil and the surface oi' the workpiece, and inas
member for connection to suitable current con
much as. in the case oi' internal heating, the
ducting and supporting members.
entire heating head must usually be passed ens
In actual practice, it may be found expedient
tirely through the bore of the workpiece, it has
to form a series of blanks ci' different sizes, each
been customary heretofore tol individually de~
blank being adapted to form a series oi different
sign and manufacture each heating head accord
sizes of heating heads by machining down to any
ing to the particular dimensions required for
required dimensions less than those of the origi
treating a specific workpiece.
is process has
nal blank. For example, a given blank can be
required the special manufacture of each head
used to produce a head having substantially the
and of its component parte.
35 same dimensions as the blank, or it can be ma
A further object of this invention is to pro
chined down to produce a head of any lesser di
vide a standardized form of blank from which
ameter. Therefore, instead of forming a single
various sizes of induction heating heads can be
heed blank capable of producing the largest di»
easily and cheaply manufactured by ordinary ma
ameter head and turning it down to provide the
chine operations.
40 smallest diameter head, which would require the
These and other objects which willbe apparent
are accomplished by the invention hereinafter
described and illustrated in the accompanying
drawings in which:
Fig. l ie a transverse sectional view' illustratingv
one embodiment of a relatively small diameter
induction heating head which can be produced
removal oi an excess amount of metal with re
sulting waste, it will be found desirable to provide
45
a series of blanks ci diii'ereut sizes, each blank
being adapted to be turned down a reasonable
amount to provide heads oi less diameter than
the original blank.
.
In that embodiment of the invention which is
by the present invention;
illustrated in FiZs. l to 4, a head forming blank is
Fig. 2 is a broken side elevation of e. head
shown comprising a mandrel forming member H
iorrning blank constructed in accordance with 50 having an enlarged portion or collar i2 formed
one embodiment of this invention, i'rom which
thereon adjacent one end. An axial bore Il ex
the head illustrated Fig. can be made:
tends inwardly irom the end adjacent the collar
Fig. 3 is a transverse sectional view ou4 the line
i2 to a point within the collar where it intersects
I-l of Fig. 2;
a radial bore il extending inwardly from the side
vli‘ixlmiisascctiononthelineß-«Iofli‘lsnt; Il of the mandrel forming member l I.
2,411,699
4
3
`An arbor-forming member I5 has a tapered
end I6 adapted to be mounted in the axial bore
I3 of the mandrel member I I. A radially extend
the insulated groove 31 and is secured in the
radial bore 3S leading to the axial bore I8 of the
arbor member. A radial passage 39 drilled in the
ing enlargement or boss I1 on the end of the ta
lower end of the arbor member-II to connect
pered portion I6 is positioned so as to project into Ul with the axial passage 25 is connected to the lower
the radial bore I4 of the mandrel member. The
end of the tubular coil 29 to provide a continuous
arbor-forming member I5 has an axially extend
passage for the now ci’ coolant therethrough.
ing bore I8 extending inwardly from the outer
As usual, a layer of insulation 4I is located be
end thereof to a point beneath the boss il.
tween the 4various coil turns and the laminated
core 28, while layers of insulation dì separate the
In forming the blank, the tapered end le of
the arbor member IE is positioned `in the axial
various turns from each other.
bore I3 of the mandrel member and the two mem
The connection between the lower end of the
coil and the radial opening de also electrically
bers mounted in axial alignment with the boss
, I1 extending into the radial'bore i4 of the man
connects this end of the coil with the mandrel
drel member. Electrical insulating material in 15 member El.
It will be apparent that the ñnished head of
the i’orm of a sleeve i9 surrounds the tapered
Fig. 1 can be made from the blank shown in Figs.
arbor end I6 within the mandrel bore and the
2 and 3 by simple inexpensive operations, and
boss I'I is similarly electrically insulated from
that the blank shown can be used to produce
the mandrel member by insulation 2l.
Both the arbor and mandrel forming members 20 heads of varying size. The broken outline shown
in Fig. 1 indicates approximately the largest size .
are preferably formed by casting a suitable cur
rent conducting copper alloy, or beryllium» or
of head which would ordinarily be made bythe '
blank of Fig. 2, while the solid lines show ap
other suitable metal. Preferably, the insulation
proximately the smallest diameter head.
i9 is a plastic which can be cast or molded in
place between the assembled arbor and mandrel 25 The finished head will ordinarily be connected
in place by threading the arbor member I5 into
forming members to join such members integral
ly together. As evident from Figs. 3 and 4, the
a threaded socket „formed in the lower end of a
supporting electric conductor de having a bore
arbor and mandrel members and the insulation
d5 .for conveying coolant tothe head. An outer
have interlocking portions which results in all
parts of the blank being rigidlyconnected to 30 current conducting sleeve dii has contact iingers
dl extending downwardly therefrom to electrical
gether so that the finished blank can be readily
ly contact the upper end of the mandrel I I above
termed into a heating head ci any smaller size
and connguration by conventional machining
the shoulder i2. This establishes an electric cir-- .
operations. For this purpose the insulation I9 is
provided with a shoulder 5 engaging the end of
member l5, coil 29, mandrel member II, ñn'gers
the mandrel forming member i i, while the end of
el, and outer conductor member et. A sleeve 48
of insulation surrounds the conductor N and
cuit from the conductor ed through the arbor
the insulation engages the shoulder t formed at
the base of the tapered portion l@ of the arbor
le. Indexing slots 22 and Mare formed in the
mandrel >and arbor members, respectively, in
order to properly position‘them during the in',
sulation molding operation so that the boss il will
be properly centered in the radial bore id.
Fig. 1 illustrates a solid mandrel type oi heat- v
ing head for which the blank shown in Figs. 2
and 3 is especially adapted. For 'this purpose,
the mandrel portion ii is turned down to puede-I
termined diameter and is given. a threaded end
2d with. an axial opening 25 drilled into the and.
for a short distance. The inner end of the turned
face is provided with a dovetailed groeve Si@ to
receive the dovetailed projections ‘il on the ra
dially tapered laminations 2li forming the core
on which the tubular heat inducing coil 2e is
wound. The laminated core is secured in place
by a washer 3l, having a groove 32 engaging the
dovetailed projections 33 at the lower ends oí the
laminations, pressed into place by a nut or similar
Sitting 3S. In turning down the mandrel mem»
cooperates with the upper end oí the insulation i9 of the blank toentirely enclose the inner con
40
ducting members.
`
_
Figs. 5 and illustrate the application of the
invention to the manufacture of a diñerent form
of heating head. As shown in Fig. 6, the manl
drel~forming member II is provided with an
axial bore 5I extending entirely therethrough,
arborniorming member le has an axial
bore 52 extending entirely through that mem- ’
ber, so that the finished blank has an axial bore
entirely through the blank from end
to end. That portion of the bore 5l passing
through the enlarged section i2 is somewhat en»
largêd over the remaining portion of the bore to
receive the insulation i9 which is- preferably
molded in place to join the two members. As
in the case of the blank illustrated in Figs. 2 and
3, the arbor member I5 has a boss il projecting
into the radial bore Iâ and surrounded by insu
lation which locks the parts together against
relative rotation or longitudinal movement. The
shoulder forming collar Ei on the insulation en
gages the end of the inarudrelv member II while
the upper end of the insulation abuts the shoul
der a on the arbor member i5, similar to the
blank of Fig. 3. The lower end ofthe arbor mem
ber Il to the desired diameter, the shoulder i l
ìand adjacent end of the mandrel member are
also turned down to predetermined sise, and the
projecting arbor member l5 is also turned down
and provided with threads 35, the insulation le
above the shoulder being turned down, but a thin
ber l5 engages a shoulder l on the surrounding
layer being left for> insulation purposes. The
insulation I9 which, in turn, engages-a shoulder
boss I1 is drilled to form a bore 3d communicat
3 on the inner bore of the mandrel member.
ing with the inner end of the axial passage it,
Fig. 5 shows the type of hollow heating head
and the insulation I9 at the bottom of the bore
for which the blank of Fig. 6 is particularly
I4 is grooved to provide a groove 31.
70 adapted. The mandrel member l l is turned down
The làminations 28 are then stacked in place
to the form shown and the inner bore is enlarged
around the mandrel Il and the coil 29 wound
slightly and a beveled shoulder 62 formed on the
around the laminated'core‘ after the blank has
bottom of the arbor member. The same lamina
been machined to the desired shape and size.
tions 28 are secured in place by a washer 53 held
The upper end 38 of the coil is extended through 75 in place by a Split ring 5d keyed in a slot 55 cut
2,411,699 '
5
in the outer face of the lower end o! the reduced
mandrel member I I . The tubular coil 29 is wound
in place and insulated in the manner above de
scribed, the upper end 38 extending through the
insulated groove 31 and secured in the radial bore
99 formed in the boss I1 and connected with the
axial bore 52 of the arbor member I5. The lower `
end of the heating coil is secured in or connect
member I5, thence to the upper end ofthe tubu
lar coil 98, then through the coil and outwardly
through the lower end thereof to the chamber
59, radial passages 1| and interior of the sleeve
99 from which it nows outwardly through the
hollow vinsulating tube 99 and supporting tubular
member 99. Under certain conditions of use, the
ball valve 12 will be opened to permit accelerat
ed ilow of coolant through the conductor 29 by
ed to the radlalopening 99 in the lower end of
the mandrel member II. This opening com 10 accelerating the discharge downwardly through
municates with an inner chamber 59 in the inner
the ball valve.
wall of the arbor member I I.
Figs. 8 and 9 illustrate a somewhat modified
The head shown in Fig. 5 is supported in place,
form of blank for use in forming the hollow heat
with the upper end of the arbor member I5 po
ing head shown in Fig. 7. In this form a mandrel
sitioned in a socket 51 in an electric current con
member 8|V having a bore 92 extending there
ducting member 59, by a tubular supporting
through is provided with a radial bore 83 intor
member 59 which has a lower collared end 9|
secting the axial bore about midway ofthe length
engaging the shoulder 92 formed at the lower
- oi' the mandrel member. 'I'he upper end 84 of
end of the arbor member I5 within the mandrel
the mandrel member is of reduced outside di
member |I. The tubular supporting member 59 20 ameter. An elongated arbor member 85 having
is moved into position through the axial bore 5|
an axial bore 89 extending therethrough is tele
oi' the mandrel member and its outer diameter
scoped within one end of the mandrel member to
is for the greater part sulllciently less than the
which it is joined by an intervening tube 91 oi
diameter of the axial passage 52 in the arbor
insulation which surrounds a portion of reduced
member I5 to provide space for the flow of cool
diameter and engages a shoulder 81’ on the ar
ant therebetween. The tubular supporting mem
bor member and a shoulder 81” on the mandrel
ber 59is held in place within the heating head
member. Opposite the radial bore 83, the arbor
by a tube 93 o! insulating material having a head
member is provided with a thickened'cross-sec
94 vulcanized to an annular collar 95 which is
tion 88, and the insulating material has a rec
rotatably keyed in the upper end of a sleeve 96 30 tangular enlargement 89 interlocking with re
extending downwardly through the axial passage .
cesses 9| and92 in the mandrel and arbor mem
5| and having a threaded end 91 threaded in part
bers for locking the parts against relative rota
to the lower end of the mandrel member. A fit
tion and longitudinal movement.
ting 98 threaded to the projecting end of the
The blank shown in Fig. 8 is .particularly
sleeve 91 and engaging the end of the mandrel
adapted i'orthe construction o! heating heads of
member Il acts as a lock nut to secure the parts
relatively large diameter such, for example, as
together. The sleeve 99 has a plurality of radial
the head shown in Fig. 7. In this form, the
`passages 1| through which coolant tiows through
the lower end of the tubular coil 29 to the in
terior-of the sleeve 99 and outwardly through a
ball valve 12.
l
_
In the form shown in Fig. 5, the conductor 51
is electrically connected to one end of the coil
through the arbor member I5 while the other end
of the coil is electrically connected, through the
mandrel || and contact lingers 19 engaging the
upper surface of the mandrell II, with the outer
conductor 14 surrounding and insulated from the
inner conductor 51 by an insulating sleeve 15. A
ring 19 of insulation material cooperates with
the lower end of sleeve 15 and with the upper end
of the lblank insulation I9 to entirely enclose the
lower end of the conducting member 58.
As in the case oi the blank illustrated in Figs.
2 and 3, that shown in Fig. 6 is also formed by
casting the arbor and mandrel members from
any suitable conducting material and then join
ing them together by means of the intervening
insulation I9, preferably molded as described.
blank is ilrst turned to the diameter and config
uration shown, the reduced end 84 of the mandrel
member being provided with threads 93, and an
annular shoulder 94. The threaded opening 95
is formed in the large portion 88 and the insu
lation fllling the bore 89 is out and shaped as
shown. In this form, in order to obtain the
desired diameter of heating coil, a spacer ring
99 is mounted on the outer face of the mandrel
member 8| and is supported on the shoulder 94.
The spacer is held against rotation by a key 95’
engaging a key slot 99’ in the spacer. The outer
face of the spacer ring 99 has a dovetailed slot
91 for receiving the similarly shaped projections
on the laminations 98 which 'are stacked around
the ring 99 and held in place thereon by a fas
tening ring 99 secured in piace by a clamping
ring i0| threaded to the threads 93 on the man
drel member. The tubular heating coil |02 is
wound on the core and insulated therefrom in
the usual way, the upper end |03 of the coil
fitting into a sleeve connector |04 extending into
The blank of Fig. 6 can be employed to make a 60 and secured in the threaded opening 95 of the
series of induction heating heads ranging in size
arbor member through the surrounding insula
from that shown by the broken lines of Fig. 5
tion 97, and the lower end of the coil is secured
to the smaller size fully illustrated in solid lines.
to a similar sleeve connector |05 secured in a
To do so, the blank of Fig. 6 is machined to re
threaded opening |09 in the mandrel member 8|.
quired shape and size, the laminations 28 are 65
When in use, the head of Fig. 'l as above ccn
stacked in place around the mandrell II to pro
structed, is supported on the tubular supporting
vide the supporting core, and the coil 28 is wound
member |01 adapted to be inserted through the
thereon and insulated therefrom. The various
bottom or the head and having a shouldered end
supporting iittings are mounted in position at the
|08 engaging the lower face of the arbor member
time the head is secured to the supporting con 70 95, the outer diameter of the tubular supporting
ductors. In this type of heating head, there is
a continuous ilow of coolant through the heat
member |01 being suiiiciently less than the axial
bore 99 of the arbor member 85 to form a ñuld
passage |09 communicating with the upper end
ing coil, being delivered thereto through the an
nuiar passage between the tubular supporting
of the coil |03 through the hollow connector |04.
member 59 and the axial passage 52 in the arbor 75 A tubular insulating member I I0 extends upward
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