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Патент USA US3048073

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Aug., 7, 1962
3,048,063
H. B. CHATFIELD
DOUBLE BLOW HEADER
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INVENTOR
Henry B. Ühatf‘ielal
892557,92@ ,4,1m
ATTORNEYS
Aug. 77 i962
H. B. CHATFIELD
3,048,063
DOUBLE BLOW HEADER
Filed March 9, 1960
5 Sheets-Sheet 2
Àug. 7, 1962
H, B. CHATFIELD
3,048,063
DOUBLE BLOW HEADER
Filed March 9, 1960
3 Sheets-Sheet 3
ATTORNEYS
United States Patent .thee
' 3,@48Ál53
Patented Aug. 7, 1952
2
1
two, being flush, force the slug 'against' the ejector pin 6
3,048,063
and into the die cavity. At this point the outside diam
eter of the stover punch 3 is piloted by the liared mouth
and close iitting internal diameter of the collet 27 in
which the die itself is recessed, thereby establishing con
DOUBLE BLGW HEADER
Henry B. Chatíield, % Metatio Research,
2683 Haliaday St., Santa Ana, Calif.
Filed Mar. 9, 1960, Ser. No. 13,824
5 Claims. (Cl. 78-9)
centricity.
The coning punch has a shaped forming head 5 and
a longitudinal bore ¿Minto which the spring stover pin
This invention relates to an improved double blow
2 retracts at the bottom of the forming stroke. Spring
header which is adapted to manufacture a general range
of bushings and sleeves characterized Iby a large diameter 10 4 in the bore 46 keeps the spring Stover pin in the work
engaging position shown in FIG. 1 until the punch bot
hole in the center thereof.
toms on the work as shown in FIG. 2. The punch 3
An object of the present invention is to provide an
reciprocates in a cylindrical guide hole 2l formed in the
improved double blow header especially adapted to man
punch `block 29.
ufacture bushings and sleeves having a large diameter
~VAs the punch advances further it forces the slug 1
hole in the center in a rapid, eñiciengand economical
manner.
'
against the ejector pin 6 within the die itself.
While the
ejector pin 6 was forward from the ejection of the pre
vious product or piece, the sliding block orstop 10 was
and die assembly which may be used with a conventional
placed in position behind the ejector rod 3 at the back of
double-blow header.
Other objects and advantages of the present inven 20 the header so that the ejector pin 6 extends well up into
the die cavity a suiiicient distance to cause the slug to
tion will be apparent to those skilled in the art from the
backward eXtrude down around the ejector pin 6. The
following detailed description and drawings in which like
center portion of the stover punch 3, including the p-in
numerals relate to like parts and in which:
2, causes the center of the product ¿il to be reduced to
FIGURE 1 is a cross sectional view of a double blow
header of the present invention in the iirst or initial 25 a relatively thin web portion'dZ which is pierced or
sheared out in the second blow. The web portion d2
position;
is shown thicker than it usually is for purposes of illus
FIG. 2 is a view similar to FIG. 1 in the second posi
tration. In practice, it is made as thin as practicable.
tion in which the article has been formed by the ñrst
Simultaneously with the completion of the extrusion
punch blow;
FIG. 3 is an enlarged cross sectional view of the die 30 backward around the ejector -pin 6 into the bottom of the
die, the stover punch 3 causes the top of the slug to
assembly in the position of FIG. 2;
upset or flare out radially to form the flange or top
FIG. 4 is a cross sectional view taken along the lines
A further object of the invention is to provide a punch
4_4 of FIG. 3 showing the ejector sleeve pin spacing
portion of the product 43 and, as the stover punch bot
toms, the die is completely filled to within a few thou
FIG. 5 is a view partially in cross section showing the 35 sandths of final tolerance. This is shown in FlGS. 2
and 3.
third or finishing blow position in which the large diam
During this process, the shoulder 22 on the ejector
eter hole is formed in the article and it is formed to
sleeve 7 has retracted into engagement with the die heel
final shape;
,
plate >24t- so that there is some backward extrusion from
FIG. 6 is a View partially in cross section showing the
finished article being ejected; and
y
40 the face of the ejector pin 6, the amount of backward
extrusion being less than the final lengthwise dimension
FIG. 7 is a view partially in cross section similar to
arrangement;
i
-
of the product 4l.. The internal diameter of the ejector
sleeve 7 is substantially equal to the diameter of the hole
through the product and is a slip-ñt over the ejector
in the conventional manner and is positioned over the
die tooling (FIG. l), it is hit a forming blow by the first 45 pin 6. The face of the ejector pin 6 is preferably for
ward of the face of the ejector sleeve 7 by .020 to .100
punch (FlGS. 2 and 3), the header slides to present the
of an inch, depending upon the particular product.
finishing punch to the die tooling and the article is hit a
Next the Stover punch 3 retracts and is replaced, by
second or finishing blow by the finishing punch to form
a shift of the slide, by the iinishing punch 36. The finish
a large diameter hole in the center thereof (FIG. 5), the
finished article or product (FIG. 6) is ejected, and lastly 50 ing punch 36 has a short, bevelled cylindrical section 43
protruding from its face which is a few thousandths of
the slug formed by the materialV from the central hole is
an inch smaller than the internal diameter 49 of the
separately ejected (FIG. 7). The only material wasted
collet 27 so that when the finishing punch comes forward,
in the whole operation is the slug formed in the ñnishing
it is brought into perfect concentricity with the die case
blow which provides the large diameter hole in the iin
55 30 and dies 33 and 34.
ished article.
Having been brought into alignment by the internal
A slug ll normally of one to two diameters in length
diameter 49 of the collet 27 in the die, the ñnishing punch
is cut off and transferred to a position in front of the
36 now advances until its cylindrical nose 39 pierces the
die cavity as shown in FiG. yl. The ejector pin 6 is
slug 4t) out of the center of the product 41. This is pos
then flush with the face of the die cavity, having been
retained there at the end of the previous stroke. The 60 sible because while the punch was shifting, the block 10
behind the ejector pin 6 and ejector rod 8 was withdrawn
die itself is recessed within the die case 3@ a distance
so that it is now free to travel backward as the slug is
slightly greater than the total length of the slug l..
pushed out of the product 41. However, inasmuch as
The coning or stover punch 3 then advances toward the
it stands up closely against the bottom of the slug, com
die with the air or spring stover pin 2 eXtending'a sub
FiG. 6 showing the waste slug being ejected.
According to this invention, a slug of metal is cut off
stantial distance out from it and, as soon as this pin has 65 pleting the backward extrusion, it is impossible for this
part of the piece being made to collapse or mushroom.
As the cylindrical section 39 of the punch 36 emerges
from the back side of the product 41, it forces the slug
40 into the ejector sleeve “7 which has also been allowed
il is a conventional cut-o?f knife and is not shown. The 70 to recede because it was only being held forward by the
stover punch 3 continues to advance until it has caught
shoulder 20 on the ejector rod 8.
up with the face of the air or spring pin 12.` and then the
As the finishing punch 36 _ bottoms, it reduces the
contacted the cut~otf slug 1, it presses it against the ejector
pin 6, thereby permitting the early retraction of the cut
otî knife while the spring stover pin 2 remains pressed
against the slug 1. The means for cutting otfthe slug
3,048,063
3
flange or top ¿i3 of the product 41 to final dimensions
and causes slight forward extrusion around the piercing
punch down against the bottom of the sleeve 7 surround
ing the ejector pin 6; However, this does not drive a
burr out through the space between the punch section 39
and the ejector sleeve 7 because of the fact that there is
the die as the punch withdraws and prevent it from
retracting with the head piece 39.
a slight void caused by the ejector sleeve '7 having been
held forward by the ejector rod 8 in the íirst blow into
The forming aXis A--A is shown in FIG. l. lt should
be noted that this is the axis common to the ejector rod,
The finishing or second punch is illustrated in FIG.
5. lt comprises a stripper collar 37, a stripper spring
3?» and a-Íorming punch head piece 39. The purpose of
the stripper assembly is to keep the finished piece 41 in
which the metal that is forward extruded during the ñnal
ejector pin, ejector sleeve, and die tooling. lt is also the
coining of the product can iiow. This is shown in PIG. 5. 10 anis in which the storer and finishing punches reciprocate
During the withdrawal stroke of the iinishing punch,
when in the operating position.
the ejector sleeve 7 is driven forward through the heavy
The block 1t) against which the ejector rod 8 bottoms
Belleville springs 15 by the knockout bar 9 engaging the
in normal operation is caused to move in and out of
collar 12 on the ejector rod il so that the part 41 is driven
position every other stroke by suitable actuating means,
out of the die without the ejector sleeve 7 or the slug ¿lll
such as a cam or small air cylinder.
moving inside of the ejector sleeve 7 which contain them.
placement and removal of this block is not critical. its
travel takes place between strokes and at no time is it
caused to move when it is under load. To further illus
trate, it is placed behind the ejector bar, or rod when it
is in the full forward position and is removed from behind
This is shown in FlG. 6.
When the ejector sleeve 'î has traveled all the way
forward against a stop and thereby completely ejected
the iinished piece from the die, the Belleville springs by
The timing of the
which it is driven are compressed and the additional travel
of the knockout bar causes the ejector pin 6 to advance
once or twice the thickness of the slug further forward,
it after the part has bottomed against it.
ment of the impact sleeve 12, collar 13 and Belleville
shapes, in alloys capable of being cold-headed.
The modified double header of the present invention
permits very economical production of high quality valve
thereby ejecting the slug fill'. This is shown in FlG. 7.
spring caps, lock bolt collars, ilanged bushings and similar
The dilîerential and sequential travel between the ejec 25 parts. Ít is suitable for high volume production of either
tor pin 6 and ejector sleeve ’7 is provided by the arrange
straight or tapered holes, cylindrical, hexagonal, or other
springs 15.
'
What l claim is:
The ejector pin 6 is attached to or integrally formed
l. ln combination, a frame, a die assembly and an
with the ejector rod S5 which is of a larger diameter than 30 ejector rod mounted ron the frame, and punch means
the ejector pin 6. The ejector rod 8 has a cap 11 at the
adapted to sequentially engage work-pieces in said die
back end thereof which rests against a back-up block 1li
assembly, an ejector pin on the die assembly end of the
when the punch 3 bottoms on the work piece as shown
ejector rod with a smaller diameter than the ejector rod,
in FÍG. 2. Back-up block l@ slides in slot 31 in the feed
an ejector sleeve iitting over said ejector pin with a slip-nt,
roll and knockout mounting block 457. The ejector sleeve 35 a back-up block adapted Ito engage and disengage the
7 lits loosely over the ejector pin 6 and is prevented from
other end of said ejector rod, a collar on the ejector rod
retracting in the positions of FIGS. 2-5 by shoulders 2li
between the ejector sleeve and back-up end of said ejec
on the ejector rod S and cooperating flange portions 22
tor rod, a cap fitting over said collar with portions project
on the ejector pin 7 and die heel plate 24.
ing forward therefrom toward the die assembly, a knock
A collar 13 is attached to the ejector pin 8 in back 40 out bar adapted to strike said cap, spring means on said
of the die assembly by a retaining pin 14». Fitting over
ejector rod which engage said cap and are located be
this collar is an impact sleeve or cap 12 which projects
tween said cap and the die assembly, and means spacing
forward and around the collar and engages Belleville
the forward end of said spring means from said ejector
springs 15. A spring retaining sleeve 16 rests against
sleeve and being reciprocable along the axis of the ejector
the other end of the Belleville springs and a spacer sleeve 45 rod, said cap being spaced from said collar by said spring
17 is provided to help adjust and position the Belleville
means in the normal posi-tion and «being adapted to engage
springs. A series or" spider pins 1S space the ejector
said collar only at the end of the stroke of the knock-out
bar.
sleeve 7 from the spacer sleeve 17 as desired, and accu
rately locate the ejector sleeve ‘7. The pins 18 are posi
2. The apparatus of claim l in which the spring means
tioned in slots 23 formed in the die heel plate 24, this
arrangement being shown in FIG. 4.
The ejector sleeve 7 is spaced from the impact sleeve
12 by the Belleville springs, retaining sleeve 16, spacer
sleeve 17, and pins 18. When the impact sleeve 12 is
first struck by the knockout bar 9, it is spaced from the
collar 13 as shown in FIG. 2. It advances against the
Belleville springs and the intermediate units to drive the
ejector Sleeve 7 forward. This ejects the finished article
comprises Belleville springs.
3. The apparatus of claim l in which the spring mean-s
comprises Belleville springs and the spacing means com
prises a sleeve slidably mounted on the ejector rod and
at least two spider pins connecting said sleeve to the ejec
tor sleeve.
4. In combination, a `frame, a die assembly and an
ejector rod mounted on the frame, and punch means
adapted to sequentially engage work-pieces in said die as
41 as shown in FIG. 6. As the blow of the knockout
sembly, the improvement whichcomprises an ejector pin
bar progresses, it compresses the Belleville springs and 60 on the die `assembly end of the ejector rod with a smaller
ultimately seats on the collar 13. This ejects the slug 4l)
diameter than the ejector rod, an ejector sleeve which lits
as shown in FIG. 7. The spacing between the collar 13
over said ejector pin with a slip-lit and has a smaller in
and impact sleeve 12 and compression of the Belleville
springs thus provides sequential travel between the ejector
ternal diameter than the ydiameter of the ejector rod so as
springs or other spring means such as alternate layers of
rubber and metal washers may be used instead of the
so as to positively restrain its backward movement, a col
anvil Z8 positioned between the die case 341 and the back
up block 2d, a collet 27, a die shim 35 and inner and
outer die kmembers 33 and 3d. Frame 26 of the header
supports and backs up the die block 24.
75
cap, spring means on said ejector rod which engage said
cap and are located between said cap and the die assembly,
and means separate ‘from said ejector sleeve which pro
sleeve and ejector pin. The knob 32 is provided on the 65 to abut against it in a bottoming position, a block adapted
to engage and disengage the other end of said ejector rod
knockout bar 9 to engage the collar 12. Regular coil
lar disposed on the ejector rod between the ejector sleeve
Belleville springs.
and back-up end of said ejector rod, a cap litting over said
The die assembly consists of a die block 25, a high 70 collar with portions projecting forward therefrom toward
the die assembly, a knock-out bar adapted to strike said
tensile die case 3d positioned inside the die block, a die
vides ya positive driving connection between it and said
3,048,063
5
spring means, said ejector rod, ejector pin, and ejector
sleeve having a common axis.
5. In combination, an ejector rod, an ejector pin on the
end of the rod with a smaller diameter than the rod, an
ejector pin,
References
and ejector
Citedsleeve
in thehaving
ñle of athis
common
patent
ejector sleeve slidably mounted on said ejector pin and
UNITED STATES PATENTS
having a smaller internal diameter than the diameter or"
the ejector rod, a block for engaging and disenga‘ging ythe
other end of said ejector rod tto restrain its backward
movement, a collar disposed on the ejector rod between
the ejector sleeve and the end of said ejector rod, a cap 10
ñtting over said collar with portions projecting forward
therefrom, a knock-out bar for striking said cap, spring
means on `said ejector rod for engaging said cap, and
6
means providing` a positive driving connection between
the ejector sleeve and said spring means, said ejector rod,
2,328,096
Remington ___________ __ Aug. 31, 1943
2,396,995
Friedman ____________ __ Mar. 19, 1946
674,173
1,018,950
1,108,552
Great Britain _________ __ June 18, 1952
France ______________ __ Jan. 14, 1953
France ______________ __ Jan. 16, 1956
FOREIGN PATENTS
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