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‘Def. *1, 1946.
‘J; J. BEDNAR EI'AL
2,408,596
METHOD'OF FORMING CYLINDER ENDS
Filed March 13, 1944
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Oct. 1, 1946. '
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_J. J. BEDNAR EI'AL
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2,408,596
METHOD OF FORMING CYLINDER ENDS-
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Filed March 13, 1944
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PECK,
Patented Oct. 1, 1946
2,408,596
UNITED STATES PATENT ornce
2,408,596
I
METHOD OF FORMING CYLINDER ENDS
Joseph J. Bednai- and Steven P. Peck, McKees
port, 2a., assig'nors, to National Tube Company, .
a corporation of. New J ersey
.
_
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Application March 13, 1944, Serial No. 526,253
1
2, Claims, (Cl. 29-1482)
.
This invention relates, to an improved method
of spinning integral ends oncylindersto adapt
them for high-pressure service.
Heretofore the spinning of cylinder ends has
2
dition of the tube orcylinder and the di?erent
stages in the operation of the method. .
.
Figure 7 illustrates a step in the method where
in the mid-portion of the built-up metal of in
been quite de?nitely restricted touse on small
creasedthickness is forced inwardly into engage
cylinders suited only for low-pressure work. One m ment
with a die member.
object of the present invention is to provide a
Figure 8 illustrates the step of removing feath
method for building up the thickness of an end
er-like portions resulting from the operation of
section of a tube or cylinder which will adapt
Figure 7.
it for high-pressure service.
10
Figure 9 is a detail portion of an end of a
A further object isv to provide a method involv
cylinder made in accordance with the’ herein
ing the building up of the end thickness of a
claimed method.
'
cylinder by spinning and subsequently eliminat;
Referring in detail to the drawings, l0 repre
ing the ?ssure or feathers formed in the region‘
of the original point of juncture of the end edges. 15 sents a conventional form of chuck adapted to
grip a tubular or cylindrical workpiece l2. This
As will appear more fully hereinafter, our im-4
chuck is rotatably supported by a suitable spin
proved method involves spinning integral closed
dle M of conventional form Which is rotated by
ends on tubular metal workpieces to form a clo
any suitable means such as a belt l6 connected
sure capable of withstanding a pressure of 2500 '
to a power drive (not shown). The chuck and
pounds per square inch or greater, the method. 20'
its
driving means are adapted to rotate the tu
being characterized by rotating the workpiece
bular workpiece‘ I2 at a speed of approximately
while. applying a work-engaging tool to. the end, , 1400 R. P. M. Mounted in juxtaposition with the
portion thereof, moving said tool‘ through arcs
chuck ‘I 0 is a tool bed [8 having slidably mounted
extending from the periphery toward the l‘ongi- Y thereon
a table 20 which canbe reciprocated back
tudinal axis'of the workpiece, also moving the
and forth by any suitable means in the direction
_ tool axially of the workpiece, to bring the end‘
lengthwise of the work.
‘
edges of said workpieceforcibly into abutment.
A compound tool rest. 22 is pivoted at 24 at
in the region of the longitudinal'axis thereof‘,f_ 1 a, point'ecccntridto- the longitudinal axis of the
and thereafter continuing the movement of said
tocl in arcuate paths extending from the periph '
' cry to a point beyond the longitudinal axis of »_
the workpiece, so as to upset said end portion_
and build up metal of increased thickness with
30
workpiece I2. The tool rest carries a slide 26
which supports‘ a tool holder 2,8 carrying a tool
30 which is preferably, although not necessarily,
in the form of a roller pivotally mounted in a
bearing
32, so that the tool can make a, rolling
out a ?ssure outside the original point of junc- '
contact with the end portion of the tubular work
ture of said edges, then stopping the rotating and 35 piece
l2. Prior to the operations about to be
thereafter pressing the mid-portion of the closed _ described,
the end portion of the workpiece will
end inwardly into engagement with a die mem- '
usually be locally heated, for example, by the
her having an axial recess opposite the point of
impingement of ?ames from oxyacetylene torches
juncture of said edges, whereby feather-like por
such as indicated at 34 and 36. The torches are
tions in the axial region adjacent said point of
eife‘ctive to maintain the end of the workpiece
juncture are pressed into said recess, and there
at the optimum spinning temperature of approx
after removing said feather-like portions.
imately 2000° to 2200° F. The torch 36 is mount
For a full understanding of the invention, ref
ed adjacent the compound rest 22, and the torch
34 is mounted on any stationary portion of the
erence should be made to the following detailed
apparatus.
disclosure, the accompanying drawings, and the
appended claims.
'
In starting the improved method, after the
'
In the drawings:
work is properly heated, the tool 30 is moved >
to the position of Figure 2, where the leading
‘edge of the periphery of the tubular workpiece
50 is engaged. After such engagement the tool rest
22 is swung about its pivot 24; for example, from
the position of Figure 2 to the position of Figure
i3, through the arcuate path indicated by the
dotted arc a:.—y, the tool'at this time swinging
Figure 1 is a plan view of conventional appa- -
ratus suitable for carrying out the present inven
tion.
Figure 2 illustrates an initial step of the im
proved method.
Figures 3, 4, 5 and 6 are views partly in ele
vation and partly in section, illustrating the con
55 about a radius r struck from the center 24 which,
2,408,596
3
4
off the projecting feather-like portions which
as shown, is in plan and is offset from the longi
tudinal central axis of the workpiece [2.
The tool 30 is moved back and forth along
its arcuate path several times, with the result
?ank the ?ssure. At the conclusion of this oper
ation the interior of the cylinder will have the
?nished face 54 and the exterior will have a
dished cavity 56, as shown in Figure 9.
that metal from the outer normally cylindrical
portion is ?owed inwardly, thus thickening the
It will be understood that in the machine op
eration of Figure 8, the feathers 46 ?anking the
?ssure .willbe eliminated. .Thus the end closure
end region?of the tubefromythe normal gauge
of the workpieceto‘the thickened condition sug
or bottom of the cylinder is a dense homogeneous
gested in Figure 3. Subsequent arcuate sweeps
._ solid section free from physical defects and sum
or the tool 3!] with an accompanying endwise .10 cient to withstand high commercial test pres
movement of the tool toward the work gradually
sures of the order of 2500 to 3500 pounds per
spins in the end of the tube'until it is substan
square inch.
_
‘
tially closed, as shown in
Figure
r
_ 4.
rI‘he
arcuate _
_}
stroke of the tool 38 is then increased to the
position such as suggested in Figure 5, thus com
While we have'shown and described precise
operating steps, it is to be understood that the
15' ‘ drawings
and descriptive matter are to be inter
pletely closing the tube end and bringing the
preted in an illustrative rather than a limiting
end edges initially into abutment in the irri'me
sense, since various modi?cations may be made
diate region of the longitudinal axis of the work
within the scope of the appended claims.
piece l2. At this stage of the method?there
We claim:
7
will be present a ?ssure f in the zone of initial 20v l, A vmethod of spinning closed ends on tubular
abutment of the end’ edges of the tube. There
metal workpieces, comprising rotating ‘the work
after the tool 30 is given a plurality of additional
piece and applying a work-engaging tool to the
arcuate sweeps to the position. indicated in
end vportion thereof, moving said tool through
Figure 6, where the working face of the tool
arcs extending from the periphery toward'the
crosses the longitudinal axis of the end of' the 25 longitudinal axis of the workpiece, moving said
workpiece. This is for the purpose of building
tool longitudinally of the axis‘ of the workpiece
up worked metal of substantial thickness with
‘to bring the end edges of said workpiece into
out 'a-?s'sure, beyond the original point of junc
abutment in the region of the longitudinal axis
ture of the end edges. This condition is illus
thereof, and thereafter‘ continuing the movement
30
trated in Figure 6, wherein it‘ is noted that the
of said tool in-arcs extending from the periphery
?ssure ends at the'point j’, and the metal beyond
to‘the point beyond'the longitudinal axis of the
that point is entirely devoid of a'fissure and is
workpiece to upset said end portion and build
thus rendered vmore dense so that it is thereby
upmetal of substantial thickness without a ‘?s
made capable ofwithstanding' considerable pres
sure outside the original pointv or juncture of
35 said‘ edges, stopping rotation of the workpiece,
Upon completion of the ‘operation represented
then extruding‘the axial portion of said closed
in Figure 6, the workpiece is removed from the
end inwardly'into an axial cavityin a die mem
chuck l0 and the end thereof is entered into
her in the'region of the point of juncture of
the cavity 38 of a die 4!). Thereupon another
said edges," said extruding step causing feather
die ‘42 having a central recess 44 therein is 40 like portions to be ,forced axially into said die
forced inwardly, with‘the result that feather
cavity,‘ and ?nally‘ removing said axially ex
like portions 46 located in the longitudinal cen
truded feather-like portions;
‘ I
i
.
tral axial region "of'the' workpiece and flanking
' 2; The method of claim 1, further‘ character
the central ?ssure, are forced inwardly into, the
ized-~ by the step of facilitating the upsetting
sure.
'
‘
'
recess 44 of the die 42'.‘ “Ifhe- die 42 is then re_ '
moved and the work-piece is disengaged from the
die '42. v‘The workpiece is then chucked in a suit
able‘ metal working tool such'as a lathe or the
like, and a cutter bar 48 centered by- aguide
‘rest 5!) and carrying a spade or similar cutting
tool 52 is ‘brought into play, so as to ‘machine
operation by‘directing heat locally against the _
end. portion of the workpiece while. actuating
said tool to upset ‘the end portion of the work.
JOSEPH J. -BEDNAR.
STEVEN P.v PECK.
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