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Патент USA US2408327

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‘ Sept. 24, 1946.
c, c, LucE ErAL
2,408,325
WORKING TUBULAR ARTICLE
‘Filed Oct. 21, 1944
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Sept. 24,1946:
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C. C. LUCIE
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2,408,325
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WORKING TUBULAR ARTICLE
File'd 001.21, 1944
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Sept; 24, 1946.
C. C. LUCE ‘ET AL
2,408,325
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‘ WORKING TUBULAR ARTICLE
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WORKING TUBULAR ARTICLE x
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Filed Oct. 21,- 1944
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THEIR ‘ATTORNEY.
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2,408,325
Patented Sept. 24, 1946
UNITED STATE s2,408325PATENT
OFFICE‘ v
WORKING TUBULAR ARTICLES
‘ Charles C. Luce, McKeesport, and Neil B. Duncan,
Pittsburgh, Pa., assignors to National Tube
Company, a corporation of New Jersey
Application’october 21, 1944, Serial No. 559,866’
4 claims. (01. 29—156)
2
' 1
I
Figures 8 and 9 are enlarged sections similar
It has heretofore been proposed, to‘ increase
Figures 5 and 6, showing a modi?cation.
the yield strength of ‘the threaded end sections ‘ to Referring
more particularly to the drawings,
of oil well casing and the like by cold WOI‘kiIlg
the letter A designates a tubular workpiece. rli‘he
them prior to threading. Since cold working of
letter B designates an upset press wherein the
itself will not give the required strengthin all‘
end portion of the workpiece A, after being heat
cases, it is frequentlyinecessary' to upset, i. e.,
ed to a forging temperature, is upset by'being
thicken the walls by a hot forging operation,
held
between dies 2 and by suddenly applying
to give additional metal under the roots of the
‘ pressure against the end thereof by a mandrel
threads. Cold working of the standard internal
upset joint has added materially to the cost 10 or punch 3 to shorten the-workpiece and thicken
and taper the walls thereof as shown in Figure
thereof since in order to meet the close toler
3. The mandrel or punch 3 may be activated
ances necessitated‘ by operating conditions, it
by a suitably operated ‘crank 4.
has beenv necessary to rough and ?nish machine
-- In Figures 4, 5 and 6, we have shown a pre-'v
the bore of 1 such joints. Moreover, because
ferred
embodiment of our improved apparatus
15
metal does not flow freely incold working, it
for cold working tubular articles designated gen-,
has been necessary to perform the cold work
erally by the letter C. This comprises a die
ing in a, series of operations which in turn added ,
body
I I mounted on'a connecting rod or carrier
to the cost of treating such joints.
’ 1 I
t
8 connected to a crank 6 by a pitman 9 and a
It is accordingly’ an object of _~the present .in'-~
b
vention to provide an improved method - of-y-and 20 crosshead 5.
An annular ?ller member 12 and working die:
apparatus for cold working the endsections of .
member l4 are secured tothe die body H by
It is another objeotpto provide a method of ' bolts IS .with the joints therebetween rabbeted
as at 13. Theinner surface of the die ‘Id-has" a
and apparatus for producing thickened end sec-‘
central flat portion 16 and curved or inclined
25
tions on tubular articles that have been strengthw
portions l1 and I8 leading therefrom.
ened by a cold working operation.‘ a
A mandrel 20 is secured in the diebody-H
It is a further object to provide a method and
by a. screw threaded connection 2i providing
‘ apparatus forcold working’pipe ends ‘to raise ‘
an annular space 22 therebetween and has a
the tensile properties thereof and to meet close
plpen ,
_‘
dimensional
tolerances.
.
'
g
'
‘
.
'
30
~
proved apparatus for cold working tubular ar
ticles.
,
'
'
,
The foregoing and further objects will be ap
, The outer surface of the die member 25 has a
parent from the speci?cation ‘and ‘drawings
central ?at portion 21 and curved or inclined
portions 28 and 29 leading therefrom.
wherein:
Figure 1 is a longitudinal section of‘ the end
portion of a tube;
Figure 2 is a diagrammatic showing of the
upsetting operation;
reduced diameter portion 23 and shoulder 24
adjacent the outer endv thereof; A sleeve _or die
member 25 'of less length than the reduced'por
tion 123 is mounted thereon with a lost. motion
slidable connection and held thereon by nut: 26.,
It is a still further object to provide an‘rim
A chuck or gripper 30 is provided in align
ment with the cold reducing apparatus C to 7
40
_
Figure 3 is a view similar to Figure 1 showing
the tube after it has been upset;
Figure 4 is a similar view to Figure 2 showing
hold the workpiece A rigid while it is expanded
and reduced thereby.
In practicing the teachings of our invention, the
tubular workpiece A is heated to a suitable forg
ing temperature of the order of 2200 to 2400" F.
Figure 5 is ‘an enlarged section of the dies vand 45 and then upset in the upset press B wherein the
length thereof is shortened and the walls thick
mandrel of Figure 4 and shows thedies of Fig
ened and provided with a slight inside taper.
ure 4 being moved over the upset end of the
the improved apparatus of our invention;
,
The workpiece A is then permitted to cool and is
placed in position in front of the cold. work
the position of the dies when being withdrawn 50 apparatus C’ and securely gripped in the chuck
' 30. Crank 6 is set in motion to move the cold
from the upset end of the tube;
working apparatus C forwardly as shown in‘Fig
Figure 7 is a sectional view similar to Figures
ure5. Due to contact with the end of the work
1 and 3 showing the tube section after it has
piece A, the sliding sleeve or die 25 is moved along
been cold worked by the apparatus of
55 the ‘reduced portion 23 of mandrel 20 until it
4,5and 6; and
V
V
tube;
,
e»
'
Figure 6 is a view similar toxFig-ure 5 but shows
Figures ’ "
2,408,325
3
abuts the shoulder 24.
The inclined face 28
thereof then operates to expand the diameter
4
die member, said inner die member having a lost
motion slidable connection with said mandrel.
of the workpiece A as it is moved into the annular
2. Apparatus of the class described comprising
space 22. As soon as all the thickened portion
a carrier, a longitudinally extending annular
of the workpiece has been expanded, crank 6 is
member mounted around said carrier and hav~
operated to reverse the travel of the cold work
ing its inner end connected to said carrier, an
ing apparatus C to move in the direction shown
outer die member secured to said annular mem
in Figure 6. The sleeve 25 is held stationary by
ber adjacent the outer end thereof, a mandrel
frictional engagement with the workpiece until
mounted in said annular member having its inner
the mandrel rod 20 moves outwardly far enough 10 end connected to said annular member to provide
to bring the nut 26 into engagement therewith.
an annular space therebetween, an inner die
This brings the flat working faces I5 and 21 of
member mounted on said mandrel interiorly of
the dies l4 and .25 into opposed relation, and
said outer die member, said inner die member
upon continued movement thereof, the diameter
. having a lost motion slidable connection With said
of the workpiece is reduced by the die l4 and the 15 mandrel, and means for causing relative move
wall thickness thereof by the conjoint action of
ment between a pipe end and said die members
the die 14 and the sliding die 25.
to expand the pipe over said inner die by enter
As shown in Figure '7, when the dies !4 and
ing the pipe into said annular space, and to re
25 have passed completely over the workpiece, the
duce the diameter and wall thickness of the ex
outer diameter thereof has been returned to its
panded pipe by the conjoint action of said die
original dimension and the wall which was thick
members by Withdrawing the expanded pipe from
ened and tapered in the upset press B has been
said annular space.
reduced to a uniform thickness, the inside walls
3. The method of increasing the strength of
being concentric with the axis of the pipe so that
pipe ends which comprises upsetting the end por
it is unnecessary to machine the inside diam 25 tion ofa length of pipe while in a heated condi
eter thereof.
tion to thicken and taper the walls thereof, cool
In Figures 7 and 8, there is shown a modi?ca
ing said upset end portion below the critical tem
tion wherein the cold working is done with the
perature thereof, inserting an internal die mem
outer die member l4’ mounted with a lost mo
ber in said upset portion to expand the same
tion slidable connection on a tubular element 311
while passing an external die thereover in longi
which is secured to the die body I! by bolt l5
tudinally offset relation with respect to said in
and the annular ?ller member l2. A collar 31
ner die member, bringing said die members into
may be interposed between the end of the bolt
telescoped relation and withdrawing the same
and the tubular .element 36. In this modi?ca
from said expanded portion to reduce the diam
tion, the inner die member 25' is ?xedly mounted
eter of said expanded and upset portion by said
on the mandrel 20.
outer die and to reduce the wall thickness of
While we have shown and described one spe
said portion by the conjoint action of said inner
ci?c embodiment of our invention, it will be un—
and outer die members.
a
derstood that this embodiment is merely for the
4. Apparatus of the class described comprising
purpose of illustration and description and that 40 a carrier, a longitudinally extending annular
various other forms may be devised within the
member‘ mounted on said carrier and having its
scope of our invention, as de?ned in the appended
inner end connected to said carrier, an outer die
claims.
member secured to said annular member adjacent
We claim:
the outer end thereof, a mandrel mounted in said
1. Apparatus of the class described comprising 45 annular ‘member having its inner end connected
a carrier, a longitudinally extending annular
to said annular member to provide an annular
member mounted on said carrier and having its
space therebetween, and an inner die member
inner end connected to said carrier, an outer die
mounted on said mandrel interiorly of said outer
member secured to said annular member adjacent
die member, said outer die member having a lost
the outer end thereof, a mandrel mounted in said
motion slidable connection with said annular
annular member having its inner end connected
member.
to said annular member to provide an annular
CHARLES C. LUCE.
space therebetween, and‘ an inner die member
NEIL B. DUNCAN.
mounted on said mandrel interiorly of said outer
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