U.S. patent number 3,595,113 [Application Number 05/053,487] was granted by the patent office on 1971-07-27 for punch press tooling.
This patent grant is currently assigned to Houdaille Industries, Inc.. Invention is credited to John H. Herzog, Ronald C. Hill.
United States Patent |
3,595,113 |
Herzog , et al. |
July 27, 1971 |
PUNCH PRESS TOOLING
Abstract
A punch, stripper sleeve and die member, when out of the press,
are nested together to form a nestable tool assembly which can be
rapidly handled as a unit and inserted and removed from a punch
holder and drive assembly of a punch press.
Inventors: |
Herzog; John H. (Red Wing,
MN), Hill; Ronald C. (Corfu, NY) |
Assignee: |
Houdaille Industries, Inc.
(Buffalo, NY)
|
Family
ID: |
21984607 |
Appl.
No.: |
05/053,487 |
Filed: |
July 9, 1970 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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714957 |
Mar 21, 1968 |
3548700 |
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Current U.S.
Class: |
83/66; 83/146;
83/136 |
Current CPC
Class: |
B21D
28/34 (20130101); Y10T 83/215 (20150401); Y10T
83/096 (20150401); Y10T 83/2172 (20150401) |
Current International
Class: |
B21D
28/34 (20060101); B26d 007/18 () |
Field of
Search: |
;83/136,146 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Lawson; William S.
Parent Case Text
RELATED APPLICATION
This application is a division of our copending application for
U.S. Patent on a "Punch Holder and Drive Assembly," filed Mar. 21,
1968, Ser. No. 714,957, now U.S. Pat. No. 3,548,700.
Claims
We claim as our invention:
1. 1. A tool assembly comprising:
a. an apertured die;
b. a stripper sleeve having an apertured stripper plate disposed at
one end of said sleeve and a retainer disposed at the other end of
said sleeve;
c. an apertured spacer plate having an upper and lower abutment
surface;
d. a punch having a body portion being mountable in the aperture of
said spacer plate and having a pair of retaining means coacting
with said plate to limit axial movement therebetween, said body
portion terminating in a punch cutting edge, said punch being
nestable in said stripper sleeve and extendable through the
aperture of said stripper plate and into the aperture of said die,
said upper abutment surface of said spacer plate coacting with said
sleeve retainer and preventing removal of said punch from said
sleeve at said other end.
2. A tool assembly according to claim 1, wherein said upper and
lower abutment surfaces of said spacer plate coact with said sleeve
retainer and said stripper plate, respectively to provide an axial
lost-motion connection between said punch and said stripper
sleeve.
3. A tool assembly according to claim 1, wherein one of said pair
of retaining means of said punch body portion is a shoulder
surrounding a projection and the other of said pair of retainers is
a ring partially disposed in a groove in said projection.
4. A tool assembly according to claim 1, wherein said pair of
retaining means are a pair of rings partially disposed in a pair of
grooves in said punch body portion, said punch body portion having
an abutment directed toward and coacting with said stripper sleeve
to thereby provide an axial lost-motion connection between said
punch and said stripper sleeve.
5. A punch assembly according to claim 1, wherein said stripper
plate includes a first stripper plate member having an aperture
provided with a shoulder disposed at one end of said stripper
sleeve, and a second apertured stripper plate member disposed in
said aperture of said first stripper plate, so that said first
stripper plate member can receive punches having various sizes and
shapes of cutting edges within its aperture along with
corresponding second stripper plate members.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is directed to interchangeable tooling for a
punch press, and particularly one which is a nested tool assembly
comprising a die member, a punch and a stripper sleeve.
2. Prior Art
In a punch presses, it is desirable to perform rapid tool loading
with a minimum amount of press downtime. Heretofore, punch tolling
was so constructed that it required considerable time to detach the
punch member from the assembly. Further, small and large punches
occupied various space rendering interchangeability difficult.
SUMMARY OF THE INVENTION
The invention includes a tool assembly comprising a punch with
attachment means which is nestable in a stripper sleeve with the
punch extending through an apertured stripper plate of the sleeve
into the aperture of a die member to provide a single assembly
which may be handled as a unit and loaded and unloaded from a press
in a single operation.
An object of the present invention is to provide a punch press tool
assembly having standardized outer dimensions with interchangeable
punches and dies of different cutting dimensions.
A further object of the present invention is to provide a tool
assembly which can be loaded and unloaded in a punch press as a
unit.
Yet another object of the present invention is to provide a
construction which can be standardized as to external dimension for
interchange with a similar construction having different cutting
dimensions and shapes for the punch and die.
Many other advantages, novel features and additional objects of the
present invention will become manifest to those versed in the art
upon making reference to the detailed description and accompanying
sheets of drawings in which preferred structural embodiment
incorporating the principles of the present invention are shown by
way of illustrative examples.
On the Drawings
FIG. 1 is a view of an embodiment of a punch holder and drive
assembly having one type of tooling provided in accordance with
this invention.
FIG. 2 is a fragmentary cross-sectional view in enlarged scale of a
modified form of the tool assembly illustrated in FIG. 1;
FIG. 3 is a fragmentary cross-sectional view of a further
embodiment of the tool assembly; and
FIG. 4 is a fragmentary cross-sectional view of a form of stripper
plate for use in the devices of FIGS. 1, 2 and 3.
As shown on the Drawings
The tooling of the present invention is particularly useful in a
punch holder and drive assembly generally indicated at 14c disposed
in an upper tool support generally indicated at 15c. The upper tool
support 15c is comprised of a normally stationary U-shaped yoke or
a turret disposed beneath a press ram.
FIG. 1 illustrates a punch holder and drive assembly generally
indicated at 14c disposed in a station or guide portion 130a of an
upper turret 131a of the tool support part of a punch press
generally indicated at 15c. The guide portion 130a comprises an
inner surface of a sleeve 132a disposed in the bore 133a of the
turret 131a. The sleeve 132a has an axial groove 134a extending a
portion of the axial length of the sleeve 132a.
The punch holder and drive assembly 14c comprises a body means
generally indicated at 40c which is a one-piece member having a
head portion 45c which has a T-shaped slot 137a for reception and
engagement with a punching ram or an unloading/loading ram. The
slot 137a engages with the punching ram when the turret 131a is
rotated with respect to the rams. The punch holder and drive
assembly 14c is also provided with four groups of three axially
extending bores 172a which have stripping pins 173a therein.
The body means 40c of the punch holder and drive assembly 14c has a
lower surface 52c which has a socket 191 defined by a passageway
192 extending axially inwardly from the surface 52c. The passageway
192 has a first counterbore 193 and a second counterbore 194. In
communication with the passageway 192 is an ejection pin passageway
195 which has a countersunk portion 196 adjacent the T-shaped slot
137a.
The body means 40c has a passageway 197 extending transversely to
the passageway 192 and to the direction of reciprocation of the
punch holder and drive assembly 14c. In each of the passageways 197
is disposed a gripping member 62c, illustrated to be a ball, and a
lock means generally indicated at 64c. The passageway 197 is
provided with an inwardly extending retainer lip 198 adjacent to
the passageway 192 to limit the inward movement of the gripping
means 62 to a normal locking position.
The lock means 64c comprises a shaft or pin 199 slidably disposed
in the passageway 197. The shaft 199 has an end surface 201 which
is concave and is in contact with the gripping member 62c. Each end
surface 201 has a bore 202 which receives a spring 203 which urges
the gripping member and the end surface 201 apart. At an end
opposite to the end surface 201, the shaft 199 has a cage 204
holding a ball follower 205. The passageway 197 has a counterbore
206 adjacent the outer surface 44c to receive the cage 204.
The guide portion has a depression or groove 183a which receives
the ball follower 205 when the punch holder and drive assembly 14c
is lowered to a loading/unloading position. When the ball follower
205 is received in the depression 183a, the gripping means 62c is
still resiliently urges or biased by the spring 203 to the normal
locking position.
THe punch holder and drive assembly 14c coacts with a nestable tool
assembly 146a which has a punch 147a, a stripper sleeve 148a, a die
149a and a spacer plate 151a. The punch 147a has a body portion
152a having a cutting end 153a and an upper portion or projection
154a which is cylindrical and is received in the counterbore 193.
The spacer plate 151a has an aperture 162a which is disposed around
the projection 154a, the plate 151a resting on a shoulder 207
formed by the projection 154a and the body portion 152a. The
shoulder 207 acts as a lower retainer for the spacer plate 151a and
a second or upper retainer 208 is provided to prevent the plate
from being removed from the punch 147a. When the punch 147a is
connected to the assembly 14c, the second counterbore 194 receives
the upper retainer 208 and provides a clearance so that retainer
208 does not receive any of the punching force of the assembly 14c.
The punch 147a is provided with a locating pin 150a extending
through a branch of the aperture 162a into a groove 55c in the
lower surface 52c of the body means 40c to prevent relative
rotation of the punch 147a and the assembly 14c. The upper portion
154a has a threaded socket 211 receiving a threaded projection 212
of and attachment portion 213. The attachment portion 213 at the
opposite end from the threaded projection 212 has a head portion
214 which is defined by a neck 215. The attachment portion 213 and
upper portion 154a are received in locating surfaces defined by the
passageway 192 and counterbore 193 of the body means 40c, and the
attachment portion 213 forms a connection between the tool assembly
146a and the punch holder and drive assembly 14c when the neck 215
is engaged by the gripping means 62c.
The stripper sleeve 148a of the tool assembly 146a has a
counterbore 156a at one end receiving a stripper plate 157a which
has an aperture 158a which is complementary to the cutting end 153a
of the punch. The stripper plate 157a is retained in the
counterbore by a retainer 159a comprising a grip or clip secured to
the stripper sleeve 148a by a screw. At the end opposite the
counterbore 156a, the stripper sleeve 148a has a retainer 161a
which is an inwardly extending flange. An upper surface 163a of the
spacer plate 151a contacts the retainer 161a and prevents the
withdrawal of the punch 147a past the end opposite the counterbore
156a.
During the punching operation, a punch ram is engaged in the slot
137a of the punch holder and drive assembly 14c to reciprocate the
assembly in the guide portion 130a. The punching force is
transferred from the assembly 14c to the punch 147a through the
surfaces 52c to the spacer plate 151a and then to the punch body
152a. During the downward stroke of the punching ram, the stripper
pins 173a are urged downwardly by means (not shown) to force the
stripper sleeve 148a into engagement with a workpiece and to clamp
the workpiece between the stripper plate 157a and the die member
149a. Continuation of movement of the punch holder and drive
assembly 14c causes the punch end 153a to penetrate the workpiece
to perform the desired operation. As the punching ram completes its
downward movement and starts its upward movement, the punch end
153a is withdrawn from the workpiece while the stripper pins 173a
maintain the stripper plate 157a in engagement with the workpiece
to assist the stripping of the punch end 153a from the workpiece.
As the punch 147a is withdrawn, the upper surface 163a of the
spacer plate 151a contacts the retainer 161a and carries the
stripper sleeve 148a with the punch 147a into the station 130a to
the position illustrated.
To remove the tool assembly 146a from the punch holder and drive
assembly 14c, the turret 131a is rotated until the assembly 14c in
the station 130a is positioned beneath a loading/unloading ram. The
unloading/loading ram lowers the punch holder and drive assembly
14c to the unloading/loading position in which the ball followers
205 may enter the depressions 183a in the guide portion 130a. This
movement of the ball follower removes the positive locking of the
gripping means 62c by the lock means 64c. Next, an ejection pin
moves through the ejection pin bore 195 to apply force to the head
214 of the attachment portion 213 of the punch 147a. In response to
such force, the surfaces of the neck 215 cam or move the gripping
members 62c against the springs 203 to an unlocked position which
allows the passage of the head 214 past the gripping members 62c.
When the punch holder and drive assembly 14c is lowered to the
unloading/loading position, the movement causes the die member 149a
to be removed from the holding means of the lower turret so that
once attachment portion 213 of the punch 147a is disconnected from
the punch holder and drive assembly 14c, the nested tool assembly
146a can be removed through the station of the lower turret.
To insert a tool assembly 146a, the tool assembly is lifted through
the station of the lower turret until the attachment portion 213 is
positioned in the passageway or bore 192. Continuation of lifting
of the tool assembly causes the head 214 to contact the gripping
members 62c and to move them against the springs 203 to the
unlocked position until the neck 215 is in alignment with the
passageways 197. At that time, the springs 203 bias the gripping
members 62c into a temporary connection with the attachment portion
213. Once tool assembly 146a has been temporarily connected to the
punch holder and drive assembly 14c, the ram of the
unloading/loading station moves upwardly causing the cam followers
205 to be withdrawn from the depression 183a and to move the
locking means 64c into contact with the gripping members 62c to
maintain them in the normal locking position.
FIG. 2 illustrates a modified form of the tool assembly generally
indicated at 146b, held in a punch holder and drive assembly
generally indicated at 14c. The tool assembly 146b comprises a
punch 147b, a stripper sleeve 148b, and a spacer plate 151b. The
die associated with the tool assembly 146b is not illustrated but
is similar to the die members 149a.
The punch 147b has a punch body 152b having a cutting edge 153b at
one end and an upper portion 154b at the other end. The upper
portion 154b and the body portion 152b form a shoulder 207a which
acts as a lower retainer which coacts with an upper retainer 208a
to hold the spacer plate 151b in a locked position on the punch
147b. The upper portion 154b has a pin 150b extending outwardly and
engaged in the groove 55c to prevent rotation between the punch
147b and the punch holder and drive assembly 14c.
The stripper sleeve 148b at one end has a counterbore 156b
receiving a stripper plate 157b having an aperture 158b which is
complementary to the punch end 153b. THe stripper plate 157b is
held in the counterbore by a retainer clip 159b secured by a screw
to the stripper sleeve 148b. The stripper sleeve 148b at an end
opposite the counterbore 156b has an inwardly extending flange or
retainer 161b.
The spacer plate 151b has an upper surface 163b and a lower surface
164b which act as abutments for engaging the retainer 161b and the
stripper plate 157b to form an axial lost-motion connection
generally indicated at 211 which prevents the removal of the punch
147b from the stripper sleeve 148b. The spacer plate 151b also has
an aperture 162b which allows the positioning of the spacer plate
about the projection 154b.
When the punch holder and drive assembly 14c is driving the punch
147b into a workpiece, the punching force is transmitted by the
lower end surfaces 52c to the upper surface 163b of the spacer
plate 151b which in turn transfers the force to the punch 147b.
Force is also transmitted by a shoulder 221 to an upper surface 222
of the punch 147b. The second counterbore 194 provides space to
receive the upper retainer 208a when the tool assembly 146b is
connected to the punch holder and drive assembly 14c.
FIG. 3 illustrates a nestable tool assembly generally indicated at
146c attached to the punch holder and drive assembly 14c, both of
which are disposed in the guide portion 130a formed by the sleeve
132a disposed in the upper turret 131a of the punch press.
The tool assembly 146c comprises a punch 147c, a stripper sleeve
148c, and a spacer plate 151c. The die which is similar to the die
149a is not illustrated. The punch 147c has a punch body 152c
terminating in a punch end 153c at one end and having an upper
portion 154c at the other end. The upper portion 154c has a pair of
retainers 208c and 225 which maintain the spacer plate 151c in
position on the upper portion 154c. The upper portion 154c is also
provided with a pin 150c which is received in the groove 55c of the
punch holder and drive assembly 14c to prevent relative rotation
therebetween. The spacer plate 151c has an upper surface 163c and a
lower surface 164c which form abutments which coact with the
retainers 208c and 225 to maintain the plate 151c in its fixed
position with an aperture 162c disposed about the punch 147c.
The stripper sleeve 148c has a counterbore 156c adjacent to one end
which receives a stripper plate 157c having an aperture 158c
complementary to the punch end 153c. The stripper plate 157c is
held in the counterbore 156c by a retaining clip 159c fastened by a
screw to the stripper sleeve 148c. The stripper sleeve 148c at the
other end has an inwardly extending retainer flange 161c.
An axial lost-motion connection generally indicated at 211c is
formed by the coaction of the an abutment 226 of the punch body
152c with the stripper plate 157c and by the coaction of the
retainer 161c with the spacer plate 151c. The lost-motion
connection 211c enables the stripper sleeve 148c to move relatively
to the punch 147c during the punching operation and during the
stripping of the punch from the workpiece.
In connecting the punch 147c to the punch holder and drive assembly
14c, the upper portion 154c is disposed in the first counterbore
193 with an upper surface 222c in contact with the shoulder or
bottom 221 and the upper retainer 208c is received in the second
counterbore 194. The punching force of the punch holder and drive
assembly is transmitted by the surface 221 to the upper surface
222c to drive the punch into the workpiece. The spacer plate 151c
is of a thickness such that the upper surface 163c is not in
contact with the lower end surface 52c of the punch holder and
drive assembly 14c and therefore does not receive any of the
punching force.
As shown in FIG. 4, the punch 66b is of a smaller size than can be
accommodated by the stripper plate 31b. The punch 66b has a tip or
a cutting edge 69b at one end and an upper end such as shown in
FIG. 1, 2 or 3. To prevent relative rotation, the punch is keyed to
the body means.
The stripper sleeve 132a has a first stripper plate 31b disposed at
one end in the counterbore 33 and held there by a retainer means
34. The stripper plate 31b has an aperture 32b which is
substantially larger than the punch 66b. The aperture 32b has an
shoulder 101 formed by a counterbore which receives a second
stripper plate 102 which has an aperture 103 complementary to the
cutting edge 69b of the punch 66b. The second stripper plate 102 is
held in the counterbore against the shoulder 101 by a retaining
means or ring 104 to form a combined stripper plate 105. The
advantages of the combined stripper plate 105 are that it saves
material when providing a small aperture such as 103 for a small
punch 66b and that it allows the formation of a stripper plate
which can be adapted to handle punch tips of any size up to the
size of the aperture 32b.
Although various minor modifications might be suggested by those
versed in the art, it should be understood that we wish to employ
within the scope of the patent warranted hereon, all such
embodiments as reasonably and properly come within the scope of our
contribution to the art.
* * * * *