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30 forging - Stamping - Heat Treating
January, 1925
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W I T H T H E E Q U I P M E N T M A N U F A C T U R E R S
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AJAX HEADING MACHINE
The Ajax Manufacturing Company,
Cleveland, Ohio, have designed a heavy
duty continuous motion heading machine.
with the primary purpose of producing
machines of ruggcdncss and durability.
The heads of rivets, carriage bolts and
track bolts are formed without flash and
do not require trimming. In filling out
the corners of square and hex-headed machine
bolts, however, a washer shaped
flash is thrown out around the bottom of
the head, which is afterwards trimmed
off cold in a vertical trimming press.
These machines will produce rivets or
bolts up to and including the size of
their rating from stock at the usual forging
temperatures of from 1500 deg. to
1800 deg. F. When operating on stock
below the scaling temperatures, commonly
known as "semi-hot," the machine
is capable of. heading work up to threefourths
of its normal rated capacity.
The general arrangement has been improved
by transferring the die slide operating
mechanism from the left to the
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creased and the quality of the products
improved.
The headerslide, of increased length, is
maintained in perfect alignment by the
"V-type" ways, roll lubricated, in which
it operates. The dieslide is top-suspended
so that its bearings are not subjected to
an accumulation of scale, and its front
side liner is adjustable to take up wear
so as to assure square shearing of the
stock.
With the hand feed machine, rods
heated to four or five feet in length are
fed into the machine against the stock
gauge by the operator by hand, the machine
shearing off a blank, heading and
ejecting at the rate of from 14,000 to
18.000 counts per 10 hours.
With the automatic roll feed, mill length
rods are heated in a long furnace set
about three feet from the front of the
machine. The operator need only start
the rod into the rolls, which feed it into
the machine, so that a piece is produced
on each revolution. Outputs vary from
30,000 to 50,000 counts per 10 hours, de-
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FIG. 1- -Ajax continuous heading machine.
right hand side, making it possible for
the operator to feed the stock, watch the
quality of holts or rivets as they come
through the discharge port, which is on
the left, and adjust the stock gauge, all
from one position. This arrangement
leaves the left hand side of the machine
clear, materially expediting the setting
of dies and tools. By thus facilitating
the operation of the machine and the
supervision of production, outputs are in-
pending on the length and size of rivets
produced.
All sizes of machines can be furnished
either belt driven through countershaft
or direct gear motor driven through safety
friction clutch coupling.
The automatic roll feed mechanism is
operated from an adjustable crank pin at
the end of the crankshaft. The eccentricity
of this pin is changed by means
of an adjusting screw so that the rolls
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feed the correct amount of stock to produce
any given length bolt or rivet. The
rachet arm is fitted with two dogs, staggered
to give refinement of feed.
The feed rolls which carry the heated
bar stock consist of rings with the circumference
grooved to suit the various
sizes of stock. They are mounted in
holders on the roll shafts so as to be
easily changed for different sizes of stock
FIG. 2 (Above)—Top-suspended die slide
of Ajax heading machine. (Below)—
Top-suspended headerslide.
and adjusted laterally for different shear
center distances. The roll pressure is
controlled by removable weights mounted
on the bearings of the upper roll shafts
which are movable vertically.
With direct motor drive a safety friction
clutch coupling cushions the motor
from shocks and protects both the machine
and motor from damage should
anything prevent a complete revolution
of the crankshaft.
The steel bed is of the ribbed type with
continuous housings for the crankshaft
bearings. It is extremely heavy and its
deep sections and liberal flanges make it
so rigid between crankshaft and backing
plate that it is not necessary to pack up
excessively behind the heading tool to
bring rivet or bolt heads down to the
proper thickness. This eliminates the
pounding of the head tool on the dies
on idle strokes and increases the life of
both accordingly.
The crankshaft is of special analysis
steel forging of the single throw, two
main bearing type with cylindrical cheeks,
and large journal and eccentric pin diameters.
All toggle pins are large and of
alloy steel.
The headerslide, Fig. 2, is top-suspended
from "V-type" bearings. It is especially