close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2122481

код для вставки
July 5, 1938.
A_ 5, LYNCH
2,122,481
METHOD OF MAKING A TUBULAR PRODUCT
Filed Dec. 2. 1935
3
/
57//// /îßß%/
4
5
w/ /777/ /W
2.
|
i
|
'
YW
3'
//
I
// /Zzf
Patented July 5, 1938
_
UNITED STATES PATENT OFFICE
2,122,481
nm'rnop or MAKING A mums raonuc'r
Albert S. Lynch, Beaver, Pa., assigner to Jones
& Laughlin Steel Corporation, Pittsburgh,
Pa., a corporation of Pennsylvania
Application December 2. 1935, Serial No. 52,481
3 Claims. (Cl. 29-156)
This invention relates broadly to tubular prodInward upsetting therefore has an important
ucts and the manufacture thereof, and more
»particularly to the formation of tubular products
by upsetting. It relates still more particularly
5 to a method of forming a pipe section having an
integral coupling portion and to a novel pipe
section of such character.
It has been proposed to make pipe in sections
with integral coupling portions on the respective
10 sections by upsetting the pipe ends to form the
integral coupling portions. Pipe of this character is especially well adapted for use as drill
pipe for drilling wells. In my copending appli__ cation Serial No. 739,122, filed August 9, 1934,
L’ there is disclosed and claimed a. method of form-
ing a tubular product of the character above
mentioned and a drill pipe section having certain
novel features.
`
A disadvantage of pipe sections having integral
gg upset coupling portions as heretofore produced is
the constriction of the bore of the section paused
by upsetting. It is not possible in a single up‘setting operation in which the metal is caused to
ilow only outwardly. or away from the pipe axis,
advantage in reduction of the cost of producing
the upset pipe. 'I'his advantage is so important
that it is from the commercial standpoint neces
sary to produce pipe sections having integral
coupling portions by inward upsetting.> Sections
produced by outward upsetting only could never r
be sold at a price even approaching their cost,
so that this method is commercially worthless.
However, inward upsetting has the disadvantage l0
above mentioned of constriction of the bore.
This is highly undesirable as it seriously impedes
the ?ow of fluid through the pipe and greatly
reduces the eñiciency of the pipe.
Moreover, in upsetting pipe a mandrel is em- 15
ployed which during the upsetting extends Within
the pipe and assists in shaping the upset metal.
In order to enable withdrawal of the mandrel
without damage to the work the mandrel is made
tapered. Ordinarily the mandrel forms a part of ‘20
the upsetting tool and passes into the pipe to be
upset` ahead of the portion of the tool which
contacts the end of the pipe to perform the up
setting operation, the mandrel being tapered to
minimum diameter at its forward extremity. 'I'he 25
g5 to increase the wall thickness over about 30 per
cent. An attempt to do so results in a grain
structure in the metal which is unsatisfactory,
and a product thus produced is of no practical
value. On the other hand, it is possible in a
30 single upsetting operation in which the metal is
caused or allowed to iiow inwardly, or toward the
of the mandrel ci' relatively great diameter, re
sulting in constriction of the bore toward the
forward extremity of the mandrel. This con- 250
striction is in many cases highly undesirable and
pipe axis. to increase the wall thickness up to or
slightly over 150 per cent. and still produces.
strong commercially satisfactory product having
f3y Cri
the proper grain structure.
Consequently, in the production of pipe of the
character here concerned with it is not feasible
to upset externally only. as a considerable number of upsetting operations and intermediate re40 heatings would be necessary which would increase the cost of the pipe out of all proportion to its value. Therefore, internal upsetting
is resorted to. A satisfactory pipe section having an integral upset coupling portion _can be
45 produced in this way by a comparatively small
number of upsetting operations. as, for example,
disadvantageous, not only because it impedes fluid
how through the upset pipe. but also because, due
to the conditions imposed in upsetting, the wall
thickness of the upset pipe at the point of mini- 3
ci
mum diameter of the mandrel may be consider
ably greater than desired.
FOI' example. it iS not possible by any com
mercially practicable method heretofore em
Dloyed to form a pipe section having an integral 40
upset coupling 1301121011 having the desired in
¿2mal Rnd external Shape and the desired wall
thickness Bt all POintS M0118 the tapered mandrel.
It has not been possible to produce commercially
drill pipe with integral upset coupling portions 45
and 0f unifOI‘m bOI‘e. Which is and has fOr years
one, two or three. It is preferable to use either
two or three upsetting steps, but this compares
favorably with the number of steps which would
mandrel is designed so that the upset product
will have the desired wall thickness at the portion
been recognized BS being the most highly desir
able form of drill pipe.
The problems above mentioned have long been
„o be required if an attempt should be made t0
form the section by external upsetting only. At
least fourb and probably ilve or six, upsetting
steps with intermediate reheatings would be
i necessary to form the section by external up-
recognized but no satisfactory solution thereto 50
has hel'eÈOfOl'e been f0l1nd~ All example of a
theoretical suggestion for the formation of uni
form bore integral joint upset drill pipe is the
upsetting of the extremities of a drill pipe section
55 setting only.
externally only so as to avoid constriction of the` 56
2,122,481
2
bore. However, as explained above, this proposal
is not commercially feasible, Pipe produced ac
cording to this suggestion could never be
marketed. Moreover, I understand it to be the
fact that pipe has never been made in accordance
vention and .have illustrated certain present pre
ferred methods of practicing the same, in which
Figure 1 is a central longitudinal cross-sectional
view through a portion of an upset blank used
in the formation of a pipe section;
with such suggestion either commercially or non
commercially.
Such suggestion simply repre
sents a theoretical paper scheme. This sugges
tion is of interest, however, as showing recogni
Figure 2 is a similar view of the blank shown
in Figure l but with a portion of the interior
thereof reshaped; and
tion of the problem which applicant has solved.
In the formation of pipe of the character in
question in which the wall thickness of the upset'
portion is to be at least 30 per cent. greater than
the wall thickness of the pipe it is necessary in
commercial operation, as above explained, to up
15 set the metal inwardly or toward the axis of the
pipe. I prefer to utilize the method of upsetting
disclosed in my said application, ñrst inwardly
Figures 3 and 4 are views corresponding re
spectively to Figures 1 and 2 showing a different 10
form of structure.
Referring now more particularly to the draw
ing, Figures 1 and 2 illustrate the formation of
an integral coupling portion for the box or female
end of a pipe section while Figures 3 and 4 16
illustrate the formation of an integral coupling
portion for the pin or male end of the section.
The method used in either case is substantially
upsetting the metal in either one or two steps
the same.
and then outwardly upsetting. However, the
20 ultimate upset product has a constricted bore
and a wall portion of unnecessarily great thick
ness. In certain cases such constricted bore and
thick wall portion are not particularly undesir
able but in other cases they are highly undesir
26 able, and. it is a purpose of the present invention
Referring nrst to the form of Figures l and 2. 20
there is provided a length of pipe of suitable
characteristics and whose initial wall thickness
may be as shown at the left-hand extremity of
Figure l. The end of the pipe length or section
is preferably heated for a suitable distance from 25
its extremity, as Well known in the art, and is
then subjected to one or more upsetting opera
to obviate the disadvantages mentioned.
I preferably upset an end of a pipe section
whereby to increase the wall thickness and reduce
the internal diameter thereof and thereafter re
30 shape the interior of at least _the part of the
tions which may be, and preferably are, substan
tially the same as or similar to the upsetting
operations described and illustrated in my said
upset portion which is of least internal diameter
to' reduce the restrictive eifect imposed thereby.
I preferably accomplish the reshaping by remov
copending application. The end of the section
or blank after completion of the upsetting is
ing material from the interior of the upset por
Such removal is preferably effected by a
35 tion.
machining operation, and I ilnd it especially de
sirable and convenient to bore out at least part
of the upset portion. In this manner I am able
to render the bore of the upset portion of the
section of substantially constant diameter for‘at
least a substantial distance longitudinally of the
section, and the bore of the upset portion may
berendered of substantially constant diameter
and, if desired, of the same diameter as the bore
of the non-upset portion of the section. In one
preferred method of carrying out the invention
presently to be described I form in a commercially
drill pipe having a substan
tially uniform bore throughout. So far as I am
aware, this is the first time that upset integral
joint uniform bore drill pipe has ever been pro
duced either commercially or non-commercially.
Heretofore when uniform bore drill pipe has been
specified separate couplings have been used which
are relatively expensive, far more difficult to as
semble and much less satisfactory in use.
Pipe made by upsetting and then boring out or
` similarly removing a portion of the material from
the interior of the upset portion may readily be
identiiied by the machined surface at at least a
portion of the bore. Such machined surface is
also of advantage in reducing the friction losses
suffered by fluid passing through the pipe. _While
the friction loss in any one section of pipe may
not be great, when it is considered that a large
number of sections are coupled together in use
the friction loss is an important factor.
Other details, objects and advantages of - the
invention will become apparent as the following
description of certain present preferred embodi
ments thereof and certain present preferred
,methods of practicing the same proceeds.
In the accom
'Il
drawing I haveshown
certain present preferred embodiments of the in
shown in Figure 1 and is designated generally by
reference vnumeral 2. 'I'he external diameter is
increased to the desired extent as shown at 3
and the internal diameter is controlled as de
sired at the point l which coincides with the
portion of relatively great diameter of the ta
pered length of the mandrel used in the upsetting
step. The point corresponding with the extrem
ity of such tapered length of the mandrel is
indicated at E.
The diameter of the bore of the
upset section is .materially less at the point 5*
than at the point l, although this may be unde
sirable in the finished product due to the con
strictive effect, the relatively'great amount of
material iembodied in the section and the in
creased weight thereof.
I reshape the interior of the upset portion of
the section, as explained above, preferably by
boring, and the bored-out section is shown in
Figure 2. The material included between the
chain line B and the inner surface ofthe section
has been removed, rendering the bore of the en
tire section substantially uniform from end to
end. I thus produce integral joint uniform bore
drill pipe by a method which is practicable from
the commercial standpoint. As stated above,
although uniform bore integral> joint drill pipe
Vhas been sought for many years, it has never be
fore, so far as I am aware, been produced com
mercially or even non-commercially.
-
Figures 3 and 4 are exactly analogous to Fig
ures 1 and 2 showing the male end of the sec
tion. Parts of Figures 3 and 4 corresponding 65
respectively with parts of Figures l and 2 are -
designated by like reference numerals each hav->
ing a prime
.
The upset pipe as shown in Figures 2 and 4
may be subjected to desired after-operations such
as heat treatment, threading and nnishing.
Howeve , the pipe formed as above described is
of the desired shape and no further modiiication
in respect of its shape either internally or exter
nelly is n.
2,192,415:
3
_While I have shown and described certain pres
ent preferred embodiments of the invention and ly few upsetting and reheating operations as
certain present preferred methods of practicing compared with those which would be necessary
the same. it is to be distinctly understood that i! the blank were upset outwardly only, increas
the invention is not limited thereto but may be ing the external diameter of the blank by such
upsetting suiliciently that substantially the
otherwise variously embodied and practiced with
amount of metal necessary for formation of an
in the scope of the following claims.
integral pipe joint lies outside a cylinder deñned
I claim:
1. A method of making an upset integral -ioint by the original internal diameter of the blank,
10 drill pipe section of substantially uniform bore.
and removing material from the interior» of the
comprising heating a generally tubular blank. blank at said upset portion to enlarge the reduced
internal diameter thereof at said portion to sub
upsetting an end portion of the blank both in
the internal diameter of the non-upset
ternally and externally whereby to decrease its stantially
portion of the blank.
internal diameter and increase its external diam
3. A method of making an upset integral joint
eter. such upsetting operation entailing relatively
drill pipe section of substantially uniform bore, 15
few upsetting and reheating operations as com
pared with those which would be necessary if comprising heating a generally tubular blank.
the blank were upset outwardly only, increasing upœtting an end portion of the blank both inter
the external diameter oi the blank by such up-- naliy and externally whereby to decrease its in
20
setting sumciently that substantially the amount
of metal necessary for formation of an integral
pipe joint lies outside a cylinder denned by the
original internal diameter of the blank. and re
shaping the blank tc enlarge the reduced internal
25 diameter thereof at said upset portion to sub
stantially the internal diameter of the non-upset
portion of the blank.
2. A method of making an upset integral Joint
30
ternal diameter and increase its external diame
ter. such upsetting operation entailing relatively
few upsetting and reheating operations as com
pared with those which would be necessary if
the blank were upset outwardly only, increasing
the external diameter oi the blank by such upset
ting suiiiciently that substantially the amount of
25
metal necessary for formation o! an integral pipe
`iolnt` lies outside a cylinder denned by the origi
nal internal diameter of the blank. and boring
out of the blank at said upset portion to enlarge
the reduced internal diameter thereof at said por 30
tion to substantially the internal diameter of
the non-upset portion of the blank.
ALBmT S. LYNCH.
Документ
Категория
Без категории
Просмотров
0
Размер файла
453 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа