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Патент USA US2404575

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July 23, 1946.
w. P. HILL
Filed June 21, 1943
"Fm. "
Patented July 23,, 1946
_. v_ UNITED
2,404,575 I
Walter P. Hill, Detroit, Micln, assig-nor to?alumet
and Hecla Consolidated Copper Company, Cal
umet, Mich., a corporation of Michigan
Application June 21, 1943, Serial N'o..491,688
6. Claims.
(01.. 29-4573.)
» .
This invention relates generallyto ?nned‘tubes
‘ wall thickness or the tubingat the bearing por
and' .refers' more particularly" to an improved
tions. The-method of accomplishing-the. above
results will~be made more apparent as: this-dej
method of’ manufacturingi?nned tubes with sup
port engaging bearing portions.
scription: proceeds» especially when ‘considered in
connection with the accompanying drawing
In‘ fabricating numerous different types of
equipment requiring ?nned tubing, it is essential
to. provide bearing portions on one or both ends
Figure 11 is anlelevational view
of a. ?nned.
‘ tube
of a length of ?nned tubing in order to support
having bearing portions produced in: accordance
the latterion. theirame. structure of the equip
with this invention;
ment. Finned tubing. is? usually manufactured in 10 _ _ Figure: 2 is a longitudinal sectional. View: or a
substantially continuous lengths - by developing
tool: suitable for the purpose of formingthe hear
V the ?ns from the exterior surface of the tubing‘,
ing portions on the tubing; .
and it isnot generally considered practical or
1 Ljli‘igure 3. is an endelevationalr view'
feasible to form bearing portions ion the tubing
during the ‘fin forming operation.
‘shown in Figure 2. y
15 ‘
of ‘th'eltool
rEi'gurexi is across sectional View taken on the
In most instances the ?nned tubing is cut to
length and‘ the bearing portions are formed by
lline'dil-idiof Figure 2.
any one ‘of several methods.
rlength of tubing showing the result: of'the' strip
.:. ‘Figure .5 ' isv a. fragmentary sectional view‘ ‘of a
‘One method em
ployed in the past vis to ‘strip. the ?ns from the
ping, reducing, and. upsetting ‘operation;
end portions oftheltubingand thereafter expand 20
Figure 6 is a longitudinal vsectional view
or reduce the stripped endjportions to- suit the
speci?ed dimensions. One-objection to this pro
‘through a modi?ed form of tool.
cedure-isthat the wall thickness of the tubing is
line ‘l--‘| of Figure6; ‘and
‘ I
Figure 7 is a crosssectional view takenv on‘ the
reduced by‘ the'stripping operation" and the tub
Figure 8 is ‘a fragmentary sectional view'of a
ing is accordingly weakened at the most critical 25 ?nned. tuberesulting from‘ the tool ‘shown ‘in
"Another method/employed" in the=past>is to ?ll
Referring; ?rst
to the~~ embodiment‘ot‘
V‘ the
the cavities-between adjacent ?ns with. a suitable
ventionv shown in Figures: 1 to 5' inclusive;'_itiwill
bearing-metal tolprovide a bearing having a'di
noted that the reference characterll? [indi
ameter’at least equalv to theoutsidefdiameter of 30 be
cates a length of ?nned tubing'havingi?ns I l'and
the. ?‘nsp- This method overcomes the "objection
havingiplain or uninterrupted bearing‘ portions [2
ofiweakening the‘ tubing but, nevertheless, has
reduced diameter at the extremities thereof.
other objections. In the ?rst place, the process
?ns“ llg are ‘preferably developed directly
of ?lling the cavities between adja'centi‘?ns" with
from the exterior cylindrical surface voi’‘thelength
bearing metal is expensive,‘ and ‘the problem of
of tubing in order to ‘provide. ,anintegral? con
.obtaining'good adhesion between the metals is
struction . and insure obtaining Qniaximumjpei?e I
presented. . In the second place, the above process
ciency in heat‘ transfer; i'
is‘not applicablein cases where reduced: bearing
I The present inventioncontemplates overcoming
the limitationsnoted in connection'with theabove
methodsbyrproviding a procedure rendering it
of methods may beemploy'ed for developing ‘the
portions are; required atone or both ends of the
?ns from ‘the outer surfacevof thettbmg'ganu,
since these methods. are well known to thetrade,
it isbeli'eved unnecessary tQiHustrate'
possible to form either reduced or expanded bear
It will suffice to point out that :?nnedIt-ubing
:bearingf' ‘portions having ' a wall . thickness . some
vention, the fins at one or both'ends ofa length ‘
ing portions onthe tubing without weakening the 45. of thelabove-type is usually produced inv sub
stantially continuous ‘lengths. andathe, bearing
latter and without adding appreciablyito the cost
portions I2 are formed subsequent to ‘cuttingqthe
of .the tubing. In fact, it is‘one ofthe objectsof
tubingjto lengths. Inaccordance withrthis in- I
this inventionfto provide the ?nned. tubing with
what greater than the normal wall thickness: of 50 of tubing are stripped and“ the stripped portions '‘
the tube and to accomplishithis result "by a rela
are ironed" out to form smooth: exteriorsurfaces.
tively simple; inexpensive procedure.‘ ,
During the latter operation the: endgportions 0i .
the tubing-are upset ,to increase,thewallthick- _' '- ‘ "
3 In accordance :with .the invention,. the line are
1stripped-fromthe selected end of, the tubing, and
_ ness; of the; smooth abearingportions. and; at'izthe'
thezlattersis; expanded; and; upset" torsin'crease the 1' 55 same time; 'themlatter. are “reduced; Qrcexpanded'
able; (3) the stock is thoroughly worked in the
cavity I4 of the tool by con?ning the stock
throughout the major portion of its circumfer
to form the b'earing portions to the specified
In the embodiment of the invention shown in
Figures 1 to 5 inclusive, the bearing portions are
reduced and Figures 2 to 4 inclusive illustrate a
ence while leaving the remaining portion free to
deform into the relief portion I9 of the tool and
tool suitable forperforming the'above operations.
In detail; thefto’ol comprises a forming die I3,
thereby avoid overheating of thestock; (4) in
generally cylindrical in contourand having a _‘
cavity I4 corresponding in shape to the contourw of the bearing portions I2. _ The cavity is conr
centric with the axis of the tool and is provided with a pilot portion I5 at the entrant end of the
ing an endwise pressure on the stock during the
creasing the Wall thickness of the stock by exert
reducing operation; and (5) controlling the in
ternal diameter of the stock by the mandrel 20.
By duplicating-the foregoing operations at both
endsiof a length‘ of stock, a ?nned tube of the
tool having an internal diameter approximating V type shownin Figure 5 is provided having smooth
the external diameter of the tubing" after the .7 cylindrical bearing portions at opposite ends with
15 'walls‘ equal in thickness to or greater than the
?ns II are stripped from the tubing. ' ' a, - r
thickness of the original stock.
It is important to note that the pilot portion I’5‘
tapers inwardly at the rear end to forman annue, . i I
lar ?ared shoulder I6 which mergers into the sur
face of the cavity I4 and serves to connect the
pilot I5 with the reduced cavity I4. The sh'oul
J the one described above in that the diameter of
20 the bearing portions 23, at the ends of a length
de'r I6. is designed to exert a reducing pressure
continuously'around the entire circumference of
the stock and‘ in this manner progressively heats
the stock to a temperature sui?cient to enable the
latter to be readily worked or shaped. In order 25
Indetail, the tool shown in Figure 6 com
prises a, body 26 having an axially extending bore
1'] for receiving a mandrel 28. The mandrel 28
I Before the stock is inserted into the pilot por
of ?nned tubing 24 is increased to a diameter'at
least equal to the maximum diameter of the ?ns
25 on the tubing. The tool for fashioning the
?nned tubing 24' operates on the same principle
as the tool shown in Figure 2 but differs some
- what in construction.
to accomplish the above operation, thettool and
‘stock’ are relatively rotatedv and fed toward one
another byiany suitable mechanism not shown
The, embodiment of the invention shown in
Figures 6 to 8 inclusive di?'ers principally from
30 is ‘?xed in the bore and is reduced at one end
tion,- however, the ?ns on the leading end of the
tubing are stripped for a predetermined distance
along thetubing and this operation may be readi
as at, 29'to form-.a cavity 30 with the adjacent
inner surface of the bore. ,The dimensions of
the- cavity 3!! approximate the corresponding
dimensions of one of the enlarged bearings 23/
ly accomplished by’ providinga cutter I8 at the
entrant. end of the tool. The cutter is fastened 35 and the mandrel projects beyond the entrant
end of the cavity 30 to. form a .pilot portion 3I
to the front end of the tool in such relationship
of a diameter somewhat less than the internal
diameter of thestock. The pilot portion is con
nected tothe reduced portion 29 of the mandrel
stripped or removed as the latter enters the pilot
portion I5. Continued feeding of the tubing or V40 '28. by' an, ‘outwardly ?ared or tapered shoulder
32 which serves to apply an expanding pressure
stock into the pilot‘ engages the stock with the
onthe stock as the latter and tool are relatively
shoulder I6 which reduces thestock and heats
rotated and fed toward each other. "This pres
the latter sufficiently to render it easily workable.
.sureserves to heat the stock to a-temperature ‘
The stock is thoroughly worked inithe tool cav
which enables the stock to. be effectively worked
ity, I4 and is'prevented from overheating by a re
while in the tool cavity 30. If desired, thejin
lief I9 formed in the tool. The relief area pref
‘ to :the entrant endof the pilot I5 that the line
on theleading end of the stock .or tubing, are
erably extends "for substantially the full length
ner surface ofgjthe; cavity may be relieved at cir- .
of the tool cavity I4 and enables progressive cir
cumferential deformation of thevstock during the ’
cumferentially spaced points indicated :by .the
reference character 33 in order to permit the
stock to deform during the working operation.
Continued feeding of the stock into the an
cavity ‘I4 causes the leading end of the stockto.
As a result; the'temperature'of the stock is con
trolled to some extent and‘the; stock is prevented
forming operation.
abut the end wall I‘! of the cavity and sui?cient
endwise pressure is thereby exerted‘ on the stock
to upset ‘thélatter or, in other words’, to‘ increase . »
the walljthiekness of the "stock.
The speci?ed internal diameter of the stock is
maintained throughout the above operations by ‘a
‘,m’andrelizll ‘secured in the tool by a fastener 2I.
The mandrel 20 extends through the tool cavity’
M in concentric relation to'the latter and'is pro
vided with a head portion 22 at the'entrant" end
from; becoming overheated during the expand
ing- operatiom'
.. r
" Continued relative movement of the stock and
tool’ in directions ‘toward one another ‘ results in
engagement of the end of the stock with a shoul
der 34' formed on the mandrel'28’ at thejuncture
vof the reduced portion '291with‘the mandrel.
This shoulder exerts an endwise pressure 'on'the
"stock‘su?icient' to upset the stock and increase
' thev wall thickness of the resulting bearing’ por
of the’ cavity. VUpon reference toFigure ‘2, it
tion.~ As stated above, the outside diameter'of
this'bearing portion is "preferably equal’to' or
' the pilot portion I5'of the cavity and serves to
greater than‘the maximum diameter of the fins.
Thev purposeiof this construction'is to facilitate
will be noted that the head 22 projects beyond
direct or guide the stock into the pilot portion I5.
" It follows from the foregoing that the tool per
forms four major operations von the stock as the
‘latter and tool are relatively’rotated and fed to
' assembly in a construction where it i‘s’desired to
pass'the ‘?nned tubing through the opening with
.in' which the bearingportions' 2?_ are adapted to
ward one another. These‘ operations are'brie?yv 70
as follows: (1) the-?nsjarestripped‘ from a; pre
a1 reducing" ! pressure» is ‘exerted "on ;. the stock
l. The method of. producing‘ integral ?nned
tubing with a" portion ‘having a plain cylindrical
l'th'roughout the‘ circumference'of the stock to'heat
lexterior i'surface comprising relatively ‘rotating
determined-portion of one-‘end of the tube; (2)
.Ztlielatter'and render the same Tmore easily work
and‘ "feeding-ii ani annularly‘ recessed- tooli ma
length of ?nned tubing in directions toward each
other to effect engagement of one with the other,
removing the ?ns from the leading end of the
tubing upon initial engagement of the latter with
the tool, and increasing the wall thickness of the
stripped portion of the tubingvby upsetting said
portion against a shoulder in said recess during
continued relative movement of the tool and tub
ing toward each other.
and feeding an annularly recessed tool and.v a "
length of ?nned tubing in directions toward each
other to effect engagement of one with the other,
removing the ?ns from the leading end of the
tubing upon initial engagement of the latter with
the tool, con?ning the stripped portion of the
tubing throughout a major portion of its circum- 1
2. The method of producing integral ?nned H
tubing with a cylindrical exterior bearing sur
face comprising relatively rotating and feeding
ference during continued relative movement of
the tool and tubing toward one another, and ap-v
plying an endwise pressure on the stripped por
tion of the tubing ‘while the latter is con?ned to
increase the wall thickness of the stripped end
an annularly recessed tool of changing diameter
5. The method of forming ?nned tubing with
'and a length of ?nned tubing toward each other
to e?ect engagement of one with the other, strip 15 a plain end portion of increased wall thickness
' comprising relatively rotating about a common
ping the ?ns from the leading end of the tubing
axis and axially advancing towards each other,
upon initial relative movement of the tubing and
an annularly recessed tool vand ?nned tubing to
tool toward each other, and altering the diam
engage the latter with said recess, stripping the‘
eter of the stripped end of the tubing upon con
the leading end- of said tubing in ad
tinued relative movement of the latter and tool 20 vancefrom
of entering said recess and applying pres
toward each other by the changing diameter ,por
sure against the advancing end of the tubing to
tion of said recess.
the same and increase the wall thickness
3. The method of producing integral ?nned
thereof while con?ned within said recess.
tubing with a cylindrical exterior bearing sur
6. The method of forming ?nned tubing with
face comprising relatively rotating and feeding
end portion of increased wall thickness
a tool having an annular recess of changing di
and changed diameter comprising relatively ro
ameter and a length of ?nned tubing toward each
tating about a common axis and axially advanc
other to effect engagement of one with the other,
ing towards each other, a tool having an annular
stripping the ?ns from the leading end of the
tubing upon initial relative ‘movement of the 30 recess of changing diameter and ?nned tubing to
engage the latter with said recess, stripping the
tubing and tool toward each other, altering the
from the leading end of said tubing in ad
diameter of the stripped end of the tubing upon
vance of entering said recess and during con
continued relative movement of the latter and
tinued advancement changing the diameter
tool toward one another, and upsetting the
of the tube- by the changing diameter of the re
stripped end portion of the tubing to increase
and applying pressure against the end of the
the wall thickness thereof by pressure‘against a ~
tubing to upset the same and increase the diam
shoulder on the tool.
eter thereof while con?ned within said recess.
4. The method of producing integral ?nned
tubing with a portion having a plain cylindrical
exterior surface comprising relatively rotating 40
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