Improvements in or connected with Hydraulic Forging Presses.
Year: 1889

page_text: Date of Application, 30th Mar., 1889
Complete Specification Left, 30th Dec., 1889-Accepted, 1st Feb., 1890
PROVISIONAL: SPECIFICATION.
Improvements in or connected with Hydraulic Forging Presses.
I, CHARLES DAVY, of Park Iron Works, Sheffield in the County of York, Engineer,
do hereby declare the nature of this invention to be as follows:-
This Invention relates to feed mechanism in connection with a hydraulic forging
press used for working plate blooms or other forgings of simple form; and the inven-
tion consists in the application of counterbalanced rising and falling feed rollers or
tables applied in front of and behind the anvil and employed in conjunction with
means for moving the ingot thereon as required in the successive operations of
forging.
In the case of rollers they are carried in a frame hinged at the ond farthest from the
anvil, the free end being supported under the weight of the ingot by hydraulic pressure
or by counterweights. The normal level at which the ingot is supported is slightly
above the level of the anvil in order that the ingot may be carried over the anvil into
position to be pressed. As the part of the ingot under pressure is reduced in thick-
ness by the compression, a shoulder is formed at its under, as well as its upper, side
and it is necessary in order to make room for this shoulder or part of the ingot
of the original thickness that the rollers should descend below the level of the
anvil. This may be done either by the press-head acting through the ingot itself
or through an external mechanism adjustable according to the thickness of the
ingot and the amount of compression. On the ascent of the press-head the counter-
weights prevail and raise the rollers again sufficiently to allow of a further advance
of the ingot across the anvil preparatory to the next siroke of the press. The rollers
that receive the ingot from the anvil may rise rather higher, to assist in carrying
the last portion of the ingot on to the anvil.
The rollers may be driven by gear but they may be idle, but in this case as when
a table is used the ingot would be moved thereon by one or more rams or pushers
operated directly or indirectly by hydraulic or steam power.
Instead of binging the roller frames or tables, they may either or both be made
to rise or fall bodily, and in either case instead of balancing them permanently, they
may be raised or lowered together or independently by suitable gearing.
In conjunction with either roller frames or tables, I may employ a turnover gear
similar to those described in the specifications of Letters Patent granted to David Davy
and respectively numbered 9515 of 1886 and 10,779 of 1888, or any other form of
turnover gear for enabling the ingot to be pressed on the edge after being pressed
on the flat.
My Invention is not limited to any particular type of press, but I prefer that
described in the Specification of my Letters Patent No. 12,920 of 1884.
Dated this 30th day of March 1889.
By A. M. & Wm. Clark,
C. DAVY.
53, Chancery Lane, London, Patent Agents.
COMPLETE SPECIFICATION.
Improvements in or connected with Hydraulic Forging Presses.
I, CHARLES DAVY, of Park Iron Works, Sheffield, in the County of York, Engineer,
do hereby declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
This Invention relates to the feed rollers of a hydraulic forging press used for

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operating on large plate blooms and other large forgings of simple form, which
require to be reduced in thickness by successive squeezings of consecutive portions
of their length.
In order that the ingot or bloom may be fed across the anvil into position to be
pressed, it is necessary that, whilst being so fed, it be supported on the feeding or ingoing
side at a level slightly above that of the top of the anvil. On the other hand, as the
part of the ingot being operated on is compressed and consequently reduced in thickness
and as such diminution of thickness proceeds equally from the upper and under surfaces
while the part not yet operated on remains of the original thickness, a bodily lowering
of the ingot takes place in the act of compression and it is necessary that the feed
rollers should not resist the descent of the ingot otherwise it will be distorted.
To this end, my invention consists essentially in the combination, with the press-
head and with a set of rising and falling feed rollers or table upheld by counterbalance
weights or other yielding power (so as to bring the ingot up,to, and support it at, the
proper level in relation to the anvil to enable it to be fed over the same) of mechanism
(intermediate of the press-head and rollers or table) whereby the feed rollers or table
will be depressed by the press-head in its descent, concurrently with the compression
of the ingot and to an extent corresponding to the bodily descent of..the ingot whilst
under compression, such bodily descent being equal to half the amount of the reduction
of thickness produced by such compression.
Usually there is a set of rollers or a table at each side of the anvil and the bloom is
sometimes fed across the anvil alternately from opposite sides, the set of rollers at
the outgoing side acting for the time being as receiving rollers; when so acting
they do not need to be depressed below the level of the anvil and the mechanism
through which the press head can act on them may then be thrown out of action.
They then remain at a height at, or slightly above, the level of the anvil so as to
assist in carrying the ingot, especially the last portion thereof, over the anvil.
Reference is to be had to the accompanying drawings, forming part of this
specification, wherein figure 1 is a longitudinal section on line 1-figure 2 which
is a horizontal section on line 2-2 figure 3 which is a vertical section on line 3-3
figure 1 of a hydraulic forging press provided with sets of counterbalanced
feed rollers at each side of the anvil. Figure.4 is a cross-section on line 4-4
figure 1. Figure 5 is a diagram illustrating, in dotted lines, the original position
of the ingot before being operated on and, in full lines, the change in form and
position of the ingot due to the compression; also the yielding action of the rollers
on the ingoing side. The same letters of reference indicate like, parts in all the
figures.
"
A is the anvil, and B the press head, of a hydraulic forging press. Cand.D.are
two sets of feed rollers at opposite sides of the anvil; each set being mounted in a
frame c or d. The set. of rollers Criseandfall bodily with a parallel motion, being
for this purpose jointed to the ends of pairs of lever arms e fixed on transverse
rock shafts E E to which are fixed other fever armsty to which the counterweights F
are attached. The rock shafts have short lever arms y fixed to them which are. con-
nected together by the rod G. By this arrangement, the rise and fall of the frame c
is uniform at all points so that the frame always remains horizontal the motion of
the rollers in the upward direction being limited by the counterweights coming to
rest on supports.
The framed of the other set D is hinged upon a horizontal axis at the end d¹ farthest
from the anvil whilst the free end is supported under the weight of the ingot by
hydraulic pressure acting on a rain H connected by links h to a lever arm I on a
weigh shaft K to which other lever arms kare fixed and are connected by links k¹
to the end of the frame d nearest the anvil: The cylinder of the hydraulic ram is
in free communication with the accumulator.. Although the two sets of. rollers C, D,
are described as differently movable and differently counter weighted, the same
arrangements may be employed for both.
⚫ The rollers Care shewn as driven through a train L of pinions and interinediate
pinions from a shaft M. To provide for the rising and falling motion of the frame c,

page_text: the shaft M is, in this case, geared with the first of the series of rollers C through an
intermediate pinion m pivoted at the joint connecting together pairs of radius
links m' m pivoted on the shaft M and the roller axis respectively, so that the
intermediate pinion is held constantly in gear with both.
In the case of the set D the shaft M is the axis upon which the frame d
works.
For enabling the ingot to be pressed on the edge, after being pressed on the
flat, a turnover gear is applied to the rollers D, consisting of Y-shaped levers N
pivoted at n in the cross-bars of the frame d and projecting up between tho rollers in
position to act on the bloom lying thereon.
Both sets of rollers are provided with side fences P and a similar set of turnover
levers N may be applied to the rollers C, if required, but I have shewn this set as
provided with stationary intermediate fences O dividing up the set of rollers in
direction of its width and serving to guide or support the bloom in its edgewise
position. These fences are fixed to the cross-bars of the frame c and are connected
together, and to the side fences, by top cross-bars o.
The mechanism of my invention whereby the depression of whichever set of rollers C
or D is for the time being acting as feeding rollers is effected by the descent of the
press head B, consists of a tappet R mounted on the press-head in combination with a
lever S pivoted at t to bracket T fixed to the column of the press, and provided
with a friction roller s which bears on one of the side fences P, the ratio of the
motion of the press-head (from the moment when the compression begins), to that
transmitted through the lever S to the roller frame being as 2 is to 1 in order to
compensate for the equal compression of the metal of the ingot on its top and bottom
faces. By this means the feed rollers are depressed concurrently with the com-
pression of the ingot and in a ratio corresponding to the bodily lowering of the
ingot consequent on such compression. The tappets R are vertical screwed rods
sliding through guides on the press-head and are adjustable as to height by screw
collars or nuts worked by hand wheel and bevel pinion, as shewn, so as to strike the
levers S at the moment when the press-head begins to compress the ingot.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I would observe that
I lay no claim to the use, in connection with a hydraulic press, of rising and falling
sets of rollers or tables whether counterweighted or hydraulically supported, but
declare that what I claim is :-
1. In a hydraulic forging-press, the combination, with the press-head and with
rising and falling roller frames or tables so counterbalanced or upheld as to norimally
support the ingot at the proper level with regard to the anvil, of mechanism inter-
mediate of the press-head and of the roller frame or table whereby the press-head
in its descent will act on and depress the feed rollers concurrently with the
compression of the ingot between the press-head and anvil, substantially as
specified.
2. In a hydraulic forging press, the combination, with the press head and with a
rising and falling roller frame or table whether counterbalanced or upheld by
hydraulic power, of intermediate mechanism consisting of an adjustable tappet
carried by the press-head and of a lever pivoted to a fixed support and interposed
between the tappet and the rising and falling frame or table and applied to act on the
frame or table in such manner that the press-head in its descent will depress the feed
rollers or table concurrently with the compression of the ingot between the press
head and anvil, substantially as specified.
Dated this 30th day of December 1889
CHARLES DAVY.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.