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Патент USA US2409651

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Oct. :22,
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' D. E. WELL-s >
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2,409,649
BALL FORMING MILL
Filed June 6, 1944
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INVEN'II‘OR.
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DAVID E.WEL_\_S
BY
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ATTORNEYE -
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Oct. 22, 1946.
D. ‘E. WELLS
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2,469,649
BALL FORMING MILL
Filed June 6, ‘1944
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INVENTOR.
DAVID E. WELLS.
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A YTORNE Y3
Oct» 22, 1946:
D. E. WELLS‘
‘ 2,409,649
BALL FORMING MILL
Filed June 6, 1944
5 sheeisfsheet 4
ATTORNE Y5.
7 Oct. 22, 1946.
D. E. WELLS
- 2,409,649
BALL FORMING MILL
Filed June a, 1944
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5 Sheets-Sheet 5
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2,469,649
Patented Oct. '22, 1946
UNITED STATES PATENT ‘OFFICE
2,409,649
BALL FORMING MILL
David E. Wells, San Leandro, Calif.
Application June 6, 1944, Serial No; 538,985
4 Claims. (01. 80-23)’
1
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2
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1
reference should be had to the accompanying
The present invention rela es to improvements
in a ball forming mill, and it consists of the com
drawings, forming part of this application, in
binations, constructions and arrangements here~
which:
‘
Figure 1 is a longitudinal sectional View through
inafter described and claimed.
the ball forming portion of the mill, commencing
. An object of my invention is toprovidea ball
with the feeding and rod reducing end and ex
forming mill, that is adapted for transforming
. tending as far into the driving unit as indicated
by the broken lines a—-b;
1
heated rods into metal balls, the latter being
completely shaped when delivered from the mill.
It is further proposed to‘provide a mill‘ in which
Figure 2 is a longitudinal section through the
the process of forming the metal balls may be 10 remaining part of the mill, starting with the same
broken lines a—b and continuing through the
carried out in a continuous manner and prefer
driving'unit, parts being shown in elevation;
ably at a relative high speed, whereby the pro~
, ,
Figure 3 is a transversevertical section taken
along the line III-III of Figure 1;
,;
Figure 4 is a front elevation of the millas see
ployed for forming the balls. This application 15
irom'the left-hand end of Figure 1; ‘‘
is a continuation-in-part of my co-pending appli
Figure 5 is a vertical transverse section taken
cation on a Ball forming mill, Serial No. 360,347,
along the line V-—V‘ of Figure l;
,
?led October 9, 1940.
Figure 6 is a plan View of the ‘feed tube cooling
A still further object is to provide a novel rod
feeding apparatus, which is adjustable for ad 20 box and top carrier, both of which will be better
understood as the speci?cation continues‘;
vancing the heated rods atthe desired speed into '
Figure '7 is a section‘ taken along ' the line
the ball forming section of the mill and for resize
VII—VII of Figure 6;
ing the rod if necessary so that the correct amount
Figure 8 is a plan view of the feed tube support,
of material will be fed into the ball forming ‘sec
duction of the metal balls may be speeded up as
compared with the method which is now em
tion. This rod-feeding apparatus rotates ‘the
25
rods as they are advanced, and I provide a pair
of coasting rollers or dies that are arranged for
taken along ‘the line VIII-IVIII of ‘Figure 1;
Figure 9 is a vertical section taken along the
line IX-IX of Figure 1;
and then for. forming the latter into spherical
and rest bar;
1
‘
s
Figure 11 is a partial sectional view taken along
metal balls. Therod-feeding apparatusrotates
the line XI——)H of Figure-1;
the rod at the same peripheral speed as the pe
‘ Figure 12 ‘is a diagrammatic View of av circume
ripheral speed of the dies prior tothe rod entering
the dies.
.
v Figure 10 is a perspecive view of the ball guide
cutting the advancing rod into equal segments
ferential travel cutting cycle;
‘
‘
-
Figure 13 illustrates graphically the relative
sizes of the cylindrical rod segment and th
Another object of my ‘invention residesin the
provision of a pair of rod-cutting and ball-form- .
ing rollers or dies, the peripheries of which near
ly contact with each other and whose axes
spherical ball formed therefrom; and
1
Figure 1a illustrates diagrammatically the steps
practically parallel the axis or the advancing
of resizing the rod and forming the ball from a
rod.
rod segment.
These die rollers are fashionedwith spiral
grooves therein, which cut the desired amount
of material from the‘rodv and, simultaneously
40
changes or modi?cations may be made within
form the cylindricalmaterial into a spherical ball
while it is being cut.
1
While I have shown only theipreierred form of
my invention, it should be understood that various
the scope of the appended claims without spart
'
ing from the spirit or the invention.
'
‘
'
It is further proposed to provide a rod-feeding
The entire mill is illustrated in Figures 1 and 2.
apparatus that will cause the rod not only to 45
The rod resizing, feeding, cutting and ball form
rotate at the same peripheral speed as that of the
ing portions of the mill are shown in Figure 1,
rollers, but will advance the rod longitudinally at
a speed which will obviate slippage between the
while the drive and adjusting mechanism is dis
rod and the roller helices. ‘It is essential that
closed in Figure 2'.‘ The brokenv line web‘ of
the helices of the forming rollers be‘ perfectly 50 Figure 1, if superimposed on the broken lined-b
aligned with respect to one another, and I-pro~
of Figure 2, will bring the two portions of the
vide novel means for accomplishing this result.
mill together and give ‘a complete showing of
‘It ‘is also proposed to provide a mill of the
the entire mill from end to end.
In describing the construction and operation
of the mill, the rod resizing and feeding end will
be mentioned ?rst; then the rod cutting and ball
forming portion of the mill; and, finally, the op
erating mechanism which actuates the entire
character described, which is adjustable for
forming metal balls of various sizes. -.
Other objects and advantages will appear as the
speci?cation proceeds, and the novel features of
my invention will beparticulariy set forth, in the
claims hereunto annexed.
-
=
i
I,
For a better understandingr ‘of, the; invention,
60
mill.
7
2,409,649
3
4
Rod resizing and feeding assembly
frame E only will be given and the corresponding
parts in the frame E’ will be primed. The frame
Referring now to Figures 1 and 4, it will be
noted that I make use of a base A for supporting
the rod resizing and feeding assembly, and this
base is secured to a bed plate B by bolts I. Two
guide posts 2-2 extend upwardly from the base A
E rests on the bed plate B and is adjustably se
ured thereto by bolts 21. The frame has a verti
cally extending guide 22 closed at its upper end
by a header 23. The latter is secured to the
frame by cap bolts 24, and the bolts in turn are
and slidably carry lower and upper rod resizing '
removably secured to the frame by cap bolt keys
and feed roller carriers 3 and 3', respectively.
25.
The lower portions of the guide posts 2—2 are 10
A bottom carrier 26 (see Figure 9) is adjustably
threaded and receive adjustable nuts 4 that bear
mounted within the guide 22 and also a feed tube
against the lower carrier 3 and prevent vertical
cooling box 2'!’ and a top rider 28, are mounted
movement below a predetermined point. In a
above the carrier and within the guide. The
like manner, the upper portions of the guide posts
bottom carrier 28 is supported by a pressure
2-2 are threaded and receive adjustable nuts 4’
screw 29, which is threaded into a pressure nut
that prevent upward movement of the upper car
30 that rests in the frame E. A cast iron breaker
rier 3' above a predetermined point. The pur
3|, or one of any other fragile material, is inter~
pose of these positive limits which will prevent
posed between the bottom carrier 25 and the
movement of the carriers away from each other
screw 29. This breaker will give way when the
will be explained later.
20 pressure on the carrier 26 exceeds a predeterThe upper carrier 3' is similar in construction
mined point. The bottom carrier has a slotted
to the lower carrier and, therefore, a description
?ange at each side for receiving cap screws 32
of the lower one will suffice for both. Like ref
for adjustably holding the carrier in place. A
erence numerals will be applied to corresponding
saddle groove 33 is formed in the top center of
parts of the two carriers, except the numerals 25 the carrier and receives a brass half bushing 34%.
will be primed for the parts associated with the
The bushing may be made of any other anti~
upper carrier 3'.
The carrier 3 has a central de
friction material and is held in place by a pro
pression 5, which is‘circular, with an axially dis
jection 35 that enters a recess 36 in the bottom
posed recess 6 (see Figure 1).
of the groove indicated at 33.
A rod_resizing feed roller housing‘, indicated 30
The feed cooling box 21 is also adjust-ably
generally at C, has a disc-shaped platform 1 that
mounted
in the guide 22 and has slotted ?anges
isv rotatably received in the depression 5 and a
31 (see Figures 6 and 7) for receiving cap screws
concentric circular extension 8 rotatably receiv
38, which adjustably hold the box in place. The
able in the recess 6. A bolt 9 secures the plat
form 1 in place, while permitting angular adjust- ‘.1
ment with respect to the carrier 3. It should be
noted at this time that the upper bolt 9' (see Fig
ure 4) is longer than the bolt 9 and passes
box receives an end feeding tube 39, which is
?anged for receiving the central feed tube IT.
A water jacket 40 surrounds the tube 39 and
has a cold water inlet 4! and a hot water outlet
42. On each side of the tube, the water jacket
through a central opening in a top tie plate Ill
that extends between the two guide posts 2_2. 40 is pierced by spring-receiving compartments 43.
Springs 54 (see Figures 6, 7 and 9) are received
A coil spring ll encircles the bolt 9’ and has its
in these compartments and have their outer ends
ends bearing against the tie plate l0 and a washer
bearing on the bottom carrier 25. A ?oating sup
I2 is mounted on the bolt.
port for the box 21 is provided in this manner.
The rod resizing and feed roller housing C
A brass bushing 45 rests on the top of the box
rotatably carries a shaft I3 on which is mounted
21 and has a one-fourth circumferential groove
a feed pinch roller M. The rollers l4 and M’
therein for a purpose hereinafter described.
are designed to grip a heated cylindrical rod D
The top rider 28 also ‘has slotted ?anges 46
therebetween and to move the rod longitudinally
with
cap screws 41 for adjustably securing it in
while rotating the rod. The rod is ?rst heated
to the proper temperature and is then introduced 50 the guide 22. The top rider is indentical to the
bottom carrier and is turned upside down. A
into a feed tube I5. The latter is carried by a
brass half bushing 48 is ?tted into a groove 49
feed tube support l6 (see Fig. 1) that is in turn
formed in the underside of the top rider. A pres
supported by the guide posts 2-2.
sure screw 50 extends through a pressure nut
The rod is then gripped by the rollers Ill-M’
and is rotated and moved longitudinally into a 55 5| and is spaced from the top rider by a cast
central feed tube l1, also carried by the support
IS. The speed of the longitudinal movement of
the rod D is controlled by canting the rollers
I4—-l4'. It will be noted from Figures 1 and 5
that the carriers 3 and 3’ have two spaced lugs l8
andl8’, respectively. Set screws l9 and I9’ are
adjustably carried by these lugs and bear against
opposite sides of ?anges 20 and 20’ that are
formed integral with the rod resizing and feed
iron breaker 52.
The‘ screws 29 and 50 are held
against accidental rotation by pins 53 and 54
that extend through openings in the screw hand
wheels 55 and 56.
The bottom carriers 26 and 26’ rotatably sup
port a, lower rod cutting and ball forming roller
die 5‘! (see Figure 1). The brass quarter bush
ings 45 and 45' rotatably support an upper rod
cutting and ball forming roller die 51’. The roller
An adjustment of the 65 die 5'! is connected by a. universal drive shaft 58
with the shaft l3 and in a like manner the roller
set screws will swing the housings angularly and
die 51' is connected by a universal drive shaft 53’
cant the rollers l4 and M’ at the desired angle.
roller housings C and C’.
The set screws are locked against accidental
movement after they have once been set.
Rod cutting and ball forming mechanism
The rod cutting and ball forming mechanism
is supported by frames E and E’ (see Figures 1
and 9). Both frames and their associated parts
are identical and, therefore, a description of the
with the shaft I3’.
The roller dies 5'! and 51’ are identical and
are provided with “drunken” or staggered helical
70 threads 59 and 59’, respectively. The initial por
tion of each thread is made narrow and sharp
for the purpose of cutting into the heated rod.
The space between the cutting edges of the
threads at the lead end of the rollers is such as
75 to receive the rod D. The cutting edges gradu
2,409,649
5
are mounted on guide: rests 66 that'are integral
ally enlarge in radii until the threads of the two
roller dies abut each other after the threads
have made one circumferential turn around the
rollers. In other words, one complete revolution
‘
with the‘frames E'and. E’.
‘
a
Bolts 61 arepassed through openings in the
guide rests 56 and through slots 68 in the guide
of both rollers will‘cause the cutting portions
rest bars Eli. ‘Set screws 69 are received in the
of the threads to sever completely a piece from
frames E and E’ and bear against lugs 10 that
are integral with the guide rest bars. The set
screws are independently adjustable for moving
the guide plates into the proper position, after
the rod D.
i
l
' The width of the entrance of the helical groove
in each roller die formed by the start of the cut
ting edge and a point 360° removed therefrom is 10 which the bolts 61 are tightened for rigidly se
curing the parts in place. The guide plates til
about two-thirds of the diameter of the rod.
cooperate with the rollers 51 and 5'5" in holding
The helical groove on each roller die widens .
the‘metal balls between the rollers while they are
gradually until it has a width equal to that of the‘
being formed into spheres. The completed balls
rod diameter and also of the ball which is simul
taneously formed during the‘ cutting operation. 15 are fed into a ball outlet tube ‘ltd (see Figure 1),
after passing through the tube 39’.
The sharp cutting edge of the initial portion of
the thread also widens gradually so that the walls
Mill operating mechanism
of the ball forming groove will have su?icient
The
mechanism
for operating the mill is illus
width to withstand the necessary ' pressure
trated
in
Figure
2.
A gear box indicated gen
needed to form the rod portion into a ball during
erally at G has a drive shaft ‘I!’ rotatably
the cutting operation. It is obvious that more
mounted therein and carrying a drive pinion
than one thread may be provided on each roller.
12. Any means desired may be utilized for ro_
In order to insure a complete severing of the
tating the drive, shaft 1|. A driven shaft ‘it is
' rod D for each revolution of the rollers 51 and
also rotatably mounted in the gear box and
51', I form a slight recess 60 in the thread ‘59 at
carries
a pinion 14 that meshes with the pinion
a .point 360° from the start of the thread of the
'12.
A
shaft
15 has a universal connection at one
roller 51, and I form a slight cutting projection
60' in the thread 59' at a point 360° from the 7 end with the shaft 'I3’and has a second universal
connection at the other end with the roller die
start of the thread on the roller 51' (see Figure
51' (see Figures 1 and 2).
‘
30
11). The two threads on the two rollers sub
Novel means are provided for‘connecting the
stantially contact each other at this point and
roller die 51 with the shaft ‘H and rmitting an
‘the projection 60 will, therefore, extend beyond
angular adjustment to be effected between the
the center of the rod D. This assuresva com
two roller dies 51 and 51', if necessary. \St is vita1
plete severing of the rod by the cutting threads
when the rollers have completed one revolution. 35 that the threads on the two die rollers p\e<gctly
coincide so that the two roller grooves will Qrm
The longitudinal movement of the rod D is such
a continuous ball forming passageway or guide
that the cutting threads merely cut into the rod
way from end to end of the rollers. The inner\
and do not necessarily aid in advancing the rod.
end of the shaft ‘H is keyed to a two-part housing
The springs 44 permit a slight give to the end
16 so that the housing will rotate with the shaft.
40
tube Stand will permit the tube to adjust itself
A stub shaft 11 is rotatably mounted in one wall
automatically as the rod is fed therethrough and
of the gear box and has its other end rotatably
as the rod is subjected to cutting strains from
disposed in the housing 16. A worm gear 18 is
both roller threads. It is sometimes advanta
keyed to that portion of the stub shaft 11 that
geous to incline the cutting andlforming roller
is rotatably received in the housing. The housing
axes slightly toward each other from the lead end
also carries a worm 19 that meshes with the worm
to the rear end so that the shaping of the cut por
gear 18 for a purpose presently to be described.
tion or segment of the rod into a ball will be
A pinion 89 is keyed to the stub shaft 11 and
progressively accomplished and will ?nally give
meshes with a pinion 8! that is mounted on a
a completed ball expelled from the rear ends of
the rollers. The cutting of the rod and the
simultaneous shaping of the piece into a ball
during the cutting operation are completed in one
revolution of the roller dies. The remaining
second driven shaft 82 similar to the driven shaft
‘13. A shaft 83, similar to the shaft ‘l5, has a
universal connection with the driven shaft 82 and
has a second universal connection with the roller
51. In the event vthat the threads on the two
thread portions de?ne a grooved channel that
smoothes the exterior ball surface.
roller dies 51 and 5'!’ should be out of registry,
‘the worm "i9 is rotated for ‘turning the worm gear
The pressure screws 29' and 58' may, be ad»
justed for bringing the rear ends of the rollers
51 and 51' closer together than the front ends. ‘
The shafts 58 and 53' with their universal joints
at ‘each end permit this movement.
I provide adjustable ball guides iii-ii! (see
Figures 3 and 10), that extend along the sides of
the rollers 51 and 51' to hold the metal balls F
in the helical grooves while they are being
formed.
that extends
Eachbetween
guide itlthe
hasrollers
a reduced
and the
edge.two
60
'58 in the housing ‘#6. This‘will rotate the stub
shaft ‘H with respect to the drive shaft 'H' and
through the pinions 8H and SI will rotate the
roller El with respect to the roller 51’. The rela
tive rotation between the two rollers can be ef
fected in either direction for properly bringing
the thread 59 into registry with the thread 59'.
‘One easy way of determining this is to position
' the two die rollers so that the projection 60' will
be received in the recess ?ll for each complete ro
tation of the rollers. After the adjustment has
edges are spaced apart a distance equal to the
diameter of the ball. It will be noted from Fig“
ure 10 that the reduced edge 62 is formed with
been made, the worm 19 is locked against any
accidental movement. Thereupon, the stub shaft
a Stellite surface and terminates in a blunt cor
as a unit with the drive'shaft ‘H.
ner portion 63. This blunt corner is disposed
at the leading ends of the rollers ti and‘ii'i'.‘
The ball guides iii are secured to guide rest bars -.
. 64 by bolts 65. rI‘he guide rest bars 63 in turn
‘ill, the worm ‘I8 and the housing 16 will rotate
The worm ‘[9 acts as a natural look
worm gear, since the rotative movement
the worm gearl‘to the worm when the
operating. Of course, a worm gear of
for the
is from
mill is
limited
\
2,409,649
7
8
spiral angle cannot rotate a'worm. In addition
rollers accomplish th'e'smoothing of the outer
surface of the ball. The guides 6| hold the metal
to this, I mount and key the worm on a bolt 84,
The ends of the bolt extend through the two
part housing 16, one end of the bolt being pro
balls between the rollers during this process. The
Vided with a head and the other end with a nut 91
(not shown). Both parts or halves of the two
part housing ‘iii are identical in size and shape.
The bolt 84 and the bolts 85 may be tightened
feed roller pressure screw nuts 4 and 4' are ad
justed to exert the proper pressure on the rollers
i4 and M’ to feed the rod longitudinally and
also rotate it. The rollers M and I4’ resize the
rod if it is oversize. The feed rollers are driven
after the angular adjustment has been made,
at the same speed as the cutting and forming
thereby clamping the two-part housing together 10 rollers and this prevents slippage between the
with sufficient force to grip the worm and pre
rod D and the threads on the forming rollers.
vent rotation of the latter. The two-part hous
The cutting portion of the threads on the forming 16 and the worm 19 now will rotate as a unit
ing rollers increases in height from zero'to one
and the pinions ‘l2 and 8 will revolve at the
half the diameter of the ball for one complete
same speed.
15 cycle of the thread. A cycle may be one fourth,
The mill can accommodate rods D of different
one third, one half, a complete revolution or more,
diameters. In the event that the rods are smaller
depending upon the number of threads on the
than the feed tubes, bushings (not shown) are
roller and the size and hardness of the material.
placed in the tubes and different die rollers 57 and
The cutting portion of the thread has a double
51’ are mounted in place of the die rollers shown.
A larger feed tube could be used when the rod is
larger. A change in feed and forming rollers is
necessary with each change in the diameter of
the rod except ‘where the pinch feed rollers re
duce the diameter of the rod to the proper size
as they feed the rod into the die rollers.
Operation
From the foregoing description of the various
cove contour with constant cove radii no matter
what the thread height. This will cause the cut
oil‘ section to be nearly spherical when severed.
The ball forming portion of the thread is made
thicker to obtain suihcient strength to perform
the side work of forming the cut portion of the
rod ‘into a sphere during the cutting action.
The eight stages of the circumferential travel
cutting cycle is illustrated in Figure 12 and shows
how the rod is simultaneously cut and shaped into
parts of the mill, the operation thereof may be
a sphere.
readily understood. The operation of the mill
has been partially described when setting forth
the several Parts.
stage. Figure
compares the length of the cut
rod portion with the diameter of the ball made
The rOd D is heated to a forging temperature
to suit the material used. Any desired metal may
be used for making the metal balls, such as
prckel, chrome, or any high abrasive resisting
alloys. The bar or rod, when heated to forging
temperature, is inserted into the feed tube l5,
where it is grasped by the pinch feed rollers l4
and It’. These rollers have been previously cant
ed to the desired degree for feeding the rod for
wardly at the proper speed and also set at a cor
rect opening in order to feed the correct amount
of material for forming a proper size ball.
Stage I and stage I’ are the same
from the same portion.
If the ball diameter is
one inch, then the length of the rod section will
be 0.666 of one inch or of the ball diameter.
Figure 14 shows diagrammatically 'howan over
sized rod D is resized by the pinch feed rollers l4
and hi’ and further discloses what portions of
the rod section are forced into places to form the
completed ball. The rod section is shown at D’
and the completed ball is shown at F.
Referring to Figure 12, the development of the
cutting thread is shown at 86 by the dot-dash line.
The eight stages illustrate the step by step action
» of the cutting thread in cutting the rod and
Should the rod be slightly oversize, the pinch
simultaneously forcing the material of each suc
feed rollers would “pinch” or resize the rod to
ceeding cylindrical portion of the rod into the
the proper diameter. The rod is fed through the
form of a ball. This action is performed in the
feed tubes I1 and 39 and then reaches the rod
following progressive and orderly manner; stage
cutting and ball forming roller dies 51 and 51’. 50 2 indicates the advancement of the rod D beyond
The pinch feed rollers advance the rod at the
the position of stage I and yet the rotation of the
same speed as the threads 59 and 59’ advance
roller dies 51 and 57’ causes the path 86 of the
along the rollers while they rotate. There is,
cutting edges 59 and 59’ to form a negative lead
therefore, no longitudinal pulling action between
of 0.110. The threads at this stage have cut into
the threads and the rod. The rod is also rotated
the rod diameter to reduce it from one inch to
at the same peripheral speed as that of the roll
seven eighths of an inch. It will be noted that
ers 5'! and 5'!’ by the pinch feed rollers and this
the concave portions of the groove adjacent to
prevents any peripheral slippage between the
the cutting edge of the thread are shaped to
rod and roller dies 51 and 51’. Small balls and
form the lower part of the ball F into a spherical
balls of ductile material may be formed from
surface.
unheated rods. The pinch feed rollers start
Stage 3 discloses the threads 59 and 59’ as cut
moving the rod longitudinally and rotating the
ting still deeper into the rod D so that they are
rod before the rod reaches the roller dies. There
spaced three fourths of an inch from each other.
is no tearing action between the rod and dies due
The rod has advanced and the dies 5?‘ and 5'!’
to lack of uniform movement therebetween.
65 have rotated so that there is still a negative lead
The ?rst revolution of the threads on each
of the path of the cutting edge of 0.065. At stage
roller die will cause them to out through the rod.
t the negative lead of the cutting edge has been
In Figure 12 I show diagrammatically eight 1
reduced to 0.008 and the threads 50 and 59' are
?ve eighths of an inch apart. The concave por
projection 65’ completes the severing of a rod 70 tions adjacent to the threads are forming a
portion from the remainder of the rod, and is
spherical surface on the portion of the ball F’
illustrated in the last stage. The cutting of the
attached to the rod and are forming a spherical
rod and the shaping of the rod into a ball is done
surface on the rod end that will form the next
stages of the circumferential cutting cycle. The
simultaneously in the first revolution of the dies
ball F.
while the rest of the helical grooves in the two 75
Stages 5 to 8 inclusive show the path 86 of the
2,409,649
.
,
9
10
cutting edge change from a negative to a positive
lead of 0.0982 for stage 5; a positive lead of 0.2008
for stage 6; a positive lead of 0.3128 for stage ‘I;
and a positive lead of 0.4336 for stage 8. During
these four stages the threads 59 and 50’ are pro
substantially abutting each other throughout the
greater portions of their lengths and ball form
gressively and uniformly advanced toward each
ing grooves disposed between the threads, the
other so that the distance between the threads is
one-half an inch for stage 5; three-eighths of an‘
inch for stage 6; one-fourth of an inch for stage
1; and one eighth of an inch for stage 8. The
concave portions adjacent to the cutting threads
continue to form the second half of the ball F
and the ?rst half of the next ball to be cut from
leading thread portions having cutting edges .
that gradually increase in height from points the
I claim:
.
1. In a ball forming mill, a pair of rod cutting
and ball ‘forming rollers having helical threads
same distance from the roller axes as the bot
toms of’ the grooves to points where the two
thread portions abut each other, concave walls
disposed adjacent to the thread portions for
forming the ball during the cutting operation,
the remaining thread portions forming walls for
the rod D. The concave ball-shaping portions
create lines of force that are in a radial direction 15 smoothing the ball surface, and means for rotat
ing the rollers, the opposed cutting portions of
and toward the center of the ball.
The displacement of the material forming the
ball results in the elongation of the axis of the
cut portion of the cylinder into the diameter of
the ball. To accomplish this result while the die 20
rollers are rotating at a uniform speed and the
rod material is being fed into the rollers at a
uniform rate of two-thirds of the rod diameter
per cycle of cutting operation, the cutting edges
the roller threads where they abut each other
being provided with a cooperating projection in
one thread receivable in a recess in the other
thread for causing the projection to extend be
yond the midpoint between the two rollers.
A ball forming mill comprising a pair of rod
feeding and rod rotating rollers, means for
canting the rollers to the desired extent for con
59 and 59’ must take the form shown in Figure 25 trolling the longitudinal movement of the rod,
a pair of rod cutting and ball forming the rollers
1. In stages 5 to 8 inclusive, the cutting threads
widen as indicated in Figure 12. Stage I’ is the
operatively connected to the feed rollers and
same as stage I and here the cutting projection
having spiral cutting and shaping threads, said
second pair of rollers receiving the rod advanced
60’ enters the recess 60, see Figure 11, for sever
ing the ball F from the rod D. The remaining 30 by the first pair of rollers, means for adjusting
the axes of the second pair of rollers toward or
grooves on the dies smooth the ball surface.
During the rod cutting and ball forming cycle,
away from each other to the desired extent to
the rod is advanced two-thirds of its own diam
cut theurod properly into pieces and for simul
eter as indicated by the line 81 in Figure 12.
taneously forming the pieces into vballs, and
The cut rod portion is elongated one third of a 35 common means for simultaneously rotating the
diameter. Just before the ball is severed, the
Ttwo pairszof rollers, said last named means in
cutting threads are made thicker from stages 5 to
'gcluding means for rotating one roller‘L of the
8 so that there is a space of ‘one sixteenth of an
‘second pairv with respect to the other r0 r or
inch between the ball F and the rod except for‘
the same pair for properly aligning the threads
the actual point of attachment. The shearing 40 on the two ball forming rollers so that th\\
grooves will provide a ball-forming channel.
a.
projection 60' operates in this space to sever the
3. A ball forming mill comprising a pair of
ball.
.
rod feeding and rod rotating rollers, a pair of rod
The forming rollers and feed rollers may be
cutting and ball forming rollers axially aligned
tightened or loosened, as occasion demands, to
form the proper ball. If the material runs over 45 with the axes of said rod feeding rollers and.
the die grooves, the feed rollers are-tightened
adapted to receive a rod advanced by the feed
ing rollers, ‘said second-named rollers having
slightly to resize the rod. On the other hand, if
‘the ball is not perfectly formed, the feedv rollers
helical rod cutting and ball forming threads,
are moved away from one another to permit a
means for rotating both sets of rollers at the same
larger diameter rod to enter the dies. If the ball
is too large, the forming rollers are brought closer
together; if too small, they are separated. The
amount of stock to make a perfect ball of the.
correct size is governed by the pressure and the
angle of cant of the feed rollers.
-
The device can be turned on its side if desired
so that the die rollers will lie in a horizontal
peripheral speed for causing the feed rollers to
rotate and longitudinally advance the rod before
it reaches the second pair of rollers so that the
forward speed of the rod will be the same as the
pitch of the threads and the rotational speed of
55 the rod periphery will be the same as the rota
tional speed of the peripheries of the second pair
of rollers; whereby the roller threads will sever
the rod into portions and form the portions into
plane. The halls can be formed and dropped
,balls, and means for canting the feed rollers at
out from the dies without passing through the
ball outlet tube 100,. The threads at the exit ends 60 the desired angle for regulating the movement
of the rod in the direction of its‘length.
of the dies would stop short of the die ends and
4. A ball forming mill comprising a pair of rod
the bodies of the die rollers would be slightly re
feeding and rod rotating rollers, means for cant
duced in diameter at their rear ends to permit
ing the rollers to the desired extent for control
the balls to dropout. Where the rollers are in
a vertical plane, there can be side ejection of the 65 ling the longitudinal movement of the rod, a pair
of rod cutting and ball forming die rollers opera
balls before the balls reach the rear of the dies.
The drawings show the cutting cycle to occupy , tively connected to the feed rollers and having
spiral cutting and shaping threads, said second
one revolution of the dies, but it is obvious that
pair of rollers receiving the rod advanced ‘by the
the cycle can ‘be completed in a fraction of a
revolution or one or more revolutions. Where 70 ?rst pair of rollers, and common ‘means for
simultaneously rotating the two pairs of rollers.
multiple cutting threads are used, the cutting and
ball forming cycles of the different threads may
overlap each other.
a
‘ DAVID E. WELLS.
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