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Патент USA US2113311

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April 5, 1938.
F. J. RODE
TEMPERATURE CONTROL FOR HYDRAULIC CUSHIONS
Filed March 12, 1935 '
2,113,311
Patented Apr. 5, ‘1938
2,113,311
UNITED STATES PATENT OFFICE
2,113,311
TEMPERATURE CONTROL FOR HYDRAULIC
CUSHIONS
Fredrick J. Bode, Toledo, Ohio
Application March 12, 1935, Serial No. 10,747
2 Claims. (Cl. 100-71)
This invention relates to power presses and is
more particularly directed to a press having a‘
hydraulically cushioned pressure pad.
The primary object of the invention is the pro
vision of means to increase the operating capac
ity of the press by controlling the working tem
perature of the liquid used to cushion the pres
sure pad, so as to increase the possible length of
stroke of a press operating ata given speed, or
10 to increase the number of strokes per minute
which can be attained by a press having a given
slide travel.
-
Other objects and advantages of the invention
will become apparent as the description proceeds,
15
reference being had to the accompanying draw
ing which illustrates one embodiment of the in
vention and in which—
Figure l is a diagrammatic side view of a press
with the pad and cushion parts in section; Fig. 2
20 is a detail elevation of one of the temperature
control coils; Fig. 3 is an end view of the coil
taken on line 3-3 of Fig. 2; and Fig. 4 is a sche
matic arrangement of the circulating system for
the temperature control medium.
25
Referring to the drawing, my invention is
shown in connection with a press l'having a sta
tionary bed 3. A centrally disposed pressure pad
5 is provided in the path of travel of the main
slide of the press in a manner well known in the
30 art. The pressure pad is carried at the upper
end of a stem 1 which carries a piston 9 at its
lower end for controlled reciprocation in a cush
ion cylinder II. The cushion cylinder is adapted
to be ?lled with oil or other suitable liquid from
35 a surrounding reservoir I3 through a centrally
closing the valve _-n and holding the parts until
the main forming die (not shown) has completed
substantially a half of its up-stroke, thereby pre
' venting deformation of the formed metal by
reason of a premature raising of the pressure pad. 5
The valve I1 is then opened and oil from the res
ervoir I3 is forced into the cylinder by air pres'—
sure. It will be seen that'the ?ow of the oil past
the valve i1 is thus extremely rapid in both di
'rections so that the friction encountered is suf- 10
?ciently great to raise the oil temperature to '
such a point that in some installations the pack
ing has been burned from the piston 8, and other
damage has been done. To overcome this condi
tion it has been the practice to limit the length 15
of stroke of a press operating at a given speed,
and similarly to restrict the number of strokes
per minute of a press having a given length of
stroke. It will ‘be appreciated that the velocity
of the oil through the passage l5 depends on 90
these factors, and hence the temperature rise
of the oil is similarly dependent.
In order to increase the working capacity of the
press, and permit an increase in operating speed _
of a press having. a given length
of stroke, the 35
present invention provides means, to control the
working temperature of the oil used in the hy
draulic cushion. This means preferably includes
metallic ‘coils 25 disposed-in the bottom .of the
reservoir l3 and constantly immersed in the liq- 30
uid. The coils may be made of any‘ suitable ma
terial and may be of any vdesired thickness, de
pending on the co-ef?cient of heat conductivity
valve may be operated in any suitable manner,
of the material used. The coils are preferably
helical in form so as to-expose the maximum sur- 35
face in a'minimum lateral area. At each end
the coil is brought out through the wall of the
reservoir to connect with‘ ‘a suitablev union- 2'!
fixed to ‘the reservoir.
2| working in a cylinder [9. The piston I9 is
movable in either direction by air pressure either
the coils 25 is taken from a suitable supply
disposed passage l5 leading ‘from the reservoir.
A suitable valve I1 is disposed in the passage ii
to control the ?ow of liquid therethrough. The
40 and in the form disclosed is actuated by a piston
on its upper or lower side depending on whether
it is desired to open or close the valve i1. 0b
45 viously any other valve controlling device may be
used as it is well known in the art to substitute
a liquid controlling means for the pneumatic
means disclosed.
It has been found in practice that as the pres
50 sure pad 5 descends and the piston 9 forces oil
out of the cylinder ll , the oil shows a marked rise
in temperature due to the friction which it en
counters in passing restricted. parts of the pas
sage around the valve II. In use, it is desirable to
lock the pressure pad in its lowered position by
As shown in Fig. 4, the cooling medium for“)
main 3| through an intake pipe 33 having a valve 1
35 disposed therein. The pipe 33 .is‘connected
to each of the coils through branches 3‘! and 39,
terminating in respective unions 21, and ,each *5
controlled by a suitable valve 40. At the opposite
end the coils are‘ connected to discharge pipes
42 and 44 which join in a main discharge pipe
46 connected to a sewer or other outlet“. It
will thus be seen that the quantity of cooling 50
medium circulated through the coils may be reg~
ulated to control the working temperature of the
liquid used in the hydraulic cushion. If it is
desired to lower the temperature slightly, the
valve 35 may be opened to permit a slow circula- 66
2,113,311
2
\
spaced interconnected cooling means in the re
tion of the cooling medium, while it it is desired ceiver in the path of ?uid forced through the
to lower the temperature of the cushioning liquid transverse passage, each of said interconnected
to a greater extent, the valve 3'5 may be opened cooling means having a portion thereof in aline
to permit a greater circulation of ‘the cooling ment with the uninterrupted passage, and means
medium.
- .
connected to the cooling means for controlling
While the invention has been described in con
the latter.
nection with a particular type of hydraulic cush
2. In a press of the character described having
ion, it should be expressly understood that it is a cushion pad and a piston carried by said pad,
capable of use with any other known type of 9. cylinder formed to receive said piston and hav
cushioning means which employs a liquidhaving ing an uninterrupted ‘transverse passage at its
10 a tendency to become hot in use. Obviously, nu
merous changes in the form and disposition of
the coils may be made without departing from the
invention as de?ned in .the appended claims.
15
What I claim is:
‘_
a
1. In a press of the character described hav
ing a,v cushion pad and a piston carried by said
pad, a cylinder formed to receive said piston and
» having an uninterrupted transverse passage at
20 its lower end, a ?uid containing receiver asso
ciated with the cylinder and having communi
cation with the latter through said transverse
passage, means for forcing ?uid from the receiver
into the cylinder to actuate the piston, a pair of
lower end, a ?uid containing receiver associated
with the cylinder and having communication
~with the latter through said transverse passage,
means for forcing ?uid from the receiver into
the cylinder to actuate the piston, a pair of spaced
longitudinally extending ‘interconnected cooling
coils in' the receiver in the path of ?uid forced
through the transverse passage, each of said in
terconnected cooling coils having a portion there—.
of in alinement with the uninterrupted passage,
and means connected to the cooling coils for con
trolling the latter.
,
.
FREDRICH J. RODE.
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