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Патент USA US3050856

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Aug. 28, 1962
R. o. BAYER ETAL
PUMP WEAR PLATE
Filed April 21, 1960
3,050,846
United States Patent 0 M1C6
$650,846
Patented Aug. 28, 1962
i
2
volves machining the end 16 until the tube is flush with
3,050,846
PUMP WEAR PLATE
Robert 0. Bayer, Wilmington, DeL, and Roy C. Meinzer,
Kennett Square, Pa., assignors to E. I. du Pont de lfle
rnours and Company, Wilmington, DeL, a corporation
of Delaware
a surface 18 of the casting.
As noted previously, the present invention is directed
primarily to the manner in which the as-cast ori?ces of
the tubes 10 are relocated within precise tolerances. This
is accomplished by ramming (FIG. 4) or otherwise up
setting each tube end to produce an upset portion 20 be
neath the surface 18. The inside diameter of the tube
.10 is preferably reduced during the ramming step to a
This invention relates generally to the production of 10 point where the through passage is nearly closed. -A ram
is shown fragmentarily in FIG. 4 and designated with the
castings and, more particularly, to those castings which
numeral 22. Both the casting l4 and the tube 10 are then
include one or more tortuous ?ow passages.
machined, by turn'mg, milling or a similar operation, to
One accepted procedure for fabricating parts provided
present a new surface 18' (FIG. 5) which intersects the
with such passages has been disclosed by Corvin in US.
Patent No. 1,234,878 and involves the steps of bending a 15 upset portion 20. In the ?nal step, the remainder of the
upset portion is drilled according to the design speci?ca
conduit-forming tube to the desired con?guration, sup
tion so as to provide a precisely located ori?ce 24, as
porting the bent tube in a mold cavity, and casting about
shown in FIG. 6. With available equipment, each ori?ce
the tube. Although the tube is used in the same manner
may be located within tolerances of $0.001 inch, or
as a core, it becomes a permanent and integral part of
the casting and forms an accurate, smooth-walled conduit 20 better.
The method improvements of the present invention have
following either a regular or an irregular path. In many
been described above in their preferred embodiment. In
instances, this procedure is preferred to those in which
some circumstances, it may be desirable to vary the order
tortuous passages are formed by drilling intersecting holes
in which the steps are accomplished. For example, the
and plugging certain of the holes or by casting about a
destructible core. None of these procedures o?ers the 25 tube ends could be upset before the bending and/ or cast
ing steps. This latter procedure has proved more diffi
degree of precision which is required when the location
cult in view of the di?iculties involved in upsetting and in
of entry and exit ports in a ?nished casting such as a
supporting the bent and upset tubes in a mold.
pump mounting plate is critical.
The improvement steps disclosed herein have particular
The most important object of the present invention is
to provide for the precise location of entry and exit ports 30 utility in the fabrication of parts such as the pump adaptor
plate illustrated in FIGS. 7 and 8. A gear pump (not
in a casting otherwise produced in the manner taught by
shown )is fastened to a plate 30 by fasteners which pass
Corvin.
through apertures 32. The latter have been omitted from
It is a further object of the invention to improve on,
FIG. 8 for purposes of clarity. Plate 30 is provided with
known procedures by the incorporation of method steps
which facilitate the location of such ports within very 35 a gasket-receiving ledge 36 surrounding a ?uid entry port
34. Port 34 communicates through branched passages
close tolerances.
Filed Apr. 21, 1960, Ser. No. 23,842
4 Claims. (Cl. 29-527)
38, 40 with pump ports 42, 44. The ?uid is' discharged
With these and other objects in view, the fabrication
from the pump to ports 46, 48 and exits through ports
procedures disclosed herein involve the initial steps of
50, 52. In addition to the pump, the associated feed and
bending a tube to the desired con?guration, casting about
the tube, and machining each end of the tube ?ush with 40 delivery pipes are coupled to plate 30 and communicate
with ports 36, 50, 52.
a surface of the casting. The precise location of the
It is apparent that changes and modi?cations may be
tube ori?ces is accomplished by ramming each end of
made in the disclosed method and that the latter may be
the tube to present an upset portion beneath the surface
applied to the production of various useful machinery
of the casting, machining the casting and the tube to a
elements of the general type shown in FIGS. 7 and 8
new surface intersecting the upset portion, and drilling
Without departing from the spirit of the present invention
through the upset portion to provide an ori?ce of the de
which is therefore intended to be limited only by the
sired size at the desired location on the new surface.
scope of the appended claims.
Additional objectives will become apparent in the fol
We claim:
‘
lowing speci?cation wherein reference is made by the use
1. A method of relocating the ori?ce of a tube em
of designating numerals to the accompanying drawing in 50
bedded in and having at least one of its ends substantially
which:
flush with a surface of an integral casting, said tube being
FIGURES l—6 illustrate successive stages in the fabri—
of a material having a higher fusibility than said cast
cation of a casting according to the teachings of the pres
ing, said method comprising the steps of: upsetting said
ent invention; and
one end of the tube, thereby partially closing it and leav
FIGS. 7 and 8 are top and side views, respectively, of
ing an upset portion beneath said casting surface; ma
a ?nished casting.
,
chining the casting and the tube to a new surface inter
After the design of a particular casting has been worked
secting the upset portion; and drilling through said portion
out, the ?rst step in its fabrication is that of bending one
or more tubes 10 to the con?guration of the tortuous
passages which will pass through the ?nished casting.
Such a tube, which is shown ?agmentarily in FIG. 1, is
usually of seamless steel. The metal chosen for the tube
must have a higher fusibility than the casting material.
The formation of branched passages by Welding or other
to provide an ori?ce therein of the desired size at‘ the
desired location on said new surface.
2. A method of relocating the ori?ce of a tube em
bedded in and having at least one of its ends substan
tially flush with a surface of an integral casting, said tube
being of a material having a higher fusibility than said
casting, said method ‘comprising the steps of: ramming
wise joining a pair of bent tubes is also contemplated. _ 65 said one end of the tube, thereby partially closing it and
When the necessary tubes have been prepared, their ends
leaving an upset portion beneath said casting surface;
are supported in ?xtures 12 (FIG. 2) within a conven
tional mold cavity as a casting 14 is poured. After re
moval from the mold and the ?xtures 12, tubes 10 are
machining the casting and the tube to a new surface inter
embedded in and project at each end thereof from cast
ing 14, as shown at 16 in FIG. 3. The next step in
secting the upset portion; and drilling through said por~
ton to proved an ori?ce therein of the desired size at the
desired location on said new surface.
3. In the fabrication of a pump adaptor plate having
- 3,050,848
'
?ow passages, the steps of: bending a flow tube to the
desired con?guration of a passage; supporting the ends
of said tube in a mold; casting a plate integral with and
about the tube, said tube'being of a material having a
higher fusibilitv than said casting; machining the’plate
' and/or- tube until the tube ends ‘are’ substantially ‘?ush
with corresponding‘ surfaces ,of the plate; upsettingeach
end' of the tube, leaving an enlargement beneath the
surface of the plate and a reduced passage through the
tubeg'machining the plate and tube to present a new sur-'
face intersecting each reduced passage; and drilling
through each'enlargement to provide an ori?ce therein
of the desired size at'the desired location on'said new
surface.
'
e
i
i
4. A method of providing a tortuous passage in a 15
?nished casting which method includes the steps of bend
ing a tube to the desired con?guration of the passage,
'
V.
7
4
supporting the ends of said tube
a mold, casting about
the bent tube, said. tube being of a material having a
higher fusibility than the casting; and machining each
end of the tube ?ush with a surface of the casting, the V
improvement of which, comprises: ramming each end of
the tube, leaving an upset portion beneath the'corret '
sponding surface of't'he casting; machining the casting and
tube to a new surface intersecting each’ portion; and drilll
ing through each portion to provide an ori?ce therein of j’
the desired size at the desired location on said new surface.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,930,160
Brostrom __‘V_4_____' ____ __ lune 18,1'1912
1,234,878
Corvin _'_g ____________ __ July 31,1917
1,598,240
Carlson __'_ _______ __V;_;_ Aug 31,1226
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