Note: Descriptions are shown in the official language in which they were submitted.
CA 02276700 1999-06-28
PRESS APPARATUS
BACKGROUND OF THE INVENTION
The present invention relates to a press apparatus. More specifically, a
press apparatus has an actuation cam in a top force, a passive cam in a bottom
force which is contact-pressed and driven by the actuation cam and to which a
processing member such as a punch is mounted, a guide base in the bottom force
which slides and guides the passive cam, a guide post which is mounted across
the guide base and moves so as to slide the passive cam, and force applying
means which applies a force to the passive cam towards an opposite-work side,
and when the passive cam to which the processing member such as a punch was
mounted is repaired, such a press apparatus makes it easy to remove the
passive
cam from the bottom force so as to improve workability. Moreover, the present
invention relates to a press apparatus having an actuation cam in a top force,
a
passive cam which is contact-pressed and driven by the actuation cam and to
which a processing member such as a punch is mounted, a guide base in a bottom
force which slides and guides the passive cam, a guide post which is mounted
across the guide base and moves so as to slide the passive cam, and force
applying means which applies a force to the passive cam towards an opposite-
work side, and more specifically relates to the press apparatus which is
constituted so that the guide post is mounted across the nearest vicinity of a
portion of the passive cam to which the processing member such as the punch is
mounted, and is positioned on both sides of the processing member, and which
can
improve processing accuracy of a cam die as much as possible.
A normal press apparatus is constituted so that a bottom force is mounted
to a bed of a press machine and a top force is mounted to a ram, and when the
top force is lifted and lowered, boring and forming processes are performed.
Since the top force is lifted and lowered in the vertical direction, the
process in the lateral direction is performed in such a manner that the
processing force in the vertical direction is converted into the processing
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force in the lateral direction by using a cam member.
The description will be given as to an example that a hole is bored in a
side wall of a work by using the press apparatus having the cam member.
As shown in FIGS. 6 and 7, a locating member 104 for locating a work 103 is
projected from a bottom force 101. A passive cam 107 having a punch 106 is
provided on a position which faces a blanked hole 105 in a side wall of the
work 103 so as to slide. A heel 108 is fixed to a backward portion of the
passive cam 107. A coil spring 109 is fitted into the passive cam 107 so as to
be externally fitted in a point of a rod 110 through which the heel 108 is
put.
One end of the coil spring 109 is brought into contact with the heel 108, and
a
nut 112 is fitted to the other end of the coil spring 109 via a washer 111. As
a result, the coil spring 109 pulls the passive cam 107 in which the hole was
provided back to the work 103. An actuation cam 118 is projected from the top
force 116 so as to be in a position which faces the passive cam 107.
The top force 116 is lowered and the actuation cam 118 advances the passive
cam 10~ against the applied force of the coil spring 109, and a hole 105 is
bored into the work 103 by the punch 106 and a die 125. When the top force 116
is lifted, the passive cam 107 is brought back by the applied force of the
coil
spring 109.
Since the hole is bored in the side wall of the work 103, as mentioned
above, the passive cam 107 having the punch 106 approaches and separates from
the work 103 so as to slide on the bottom force 102. Since the hole is bored
by
the punch 106 and the die 125, the passive cam 107 must slide exactly. A
flange 121 is projected from both sides of the lower part of the passive cam
10~, and a sidewise guide plate 122 and an upper guide plate 123 for~guiding
the
flange 121 are fixed to the bottom force 101. A reference numeral 124 is a
wear plate.
Since a processing member such as the punch 106 is mounted to the passive
cam 107, there occasionally arises a problem that a cutting edge of the punch
106 is nicked during the processing and thus it should be repaired. In the
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mounted state shown in FIG. 7, since the repair is impossible, the passive cam
107 should be removed from the bottom force 101. The heel 108 is removed and
the passive cam 107 is guided by the sidewise guide plate 122 and the upper
guide plate 123 so as to be moved towards the opposite-work side (backward).
Thereafter, the passive cam 107 is passed through the sidewise guide plate 122
and the upper guide plate 123 so as to be removed from the bottom force 101.
Therefore, it takes a long time to remove the passive cam 107 from the bottom
force 101, and thus repairing workability is not good.
In addition, while the passive cam 107 slides repeatedly, it is worn out,
and thus a gap is generated between the passive cam 107 and the sidewise guide
plate 122. As a result, the passive cam 107 cannot slide in the straight
linear
direction, and it slides non-linearly due to the gap. Since the punch 106
mounted to the passive cam 107 also slide non-linearly, the punch 106 cannot
blank the die 125 in its whole periphery with a suitable clearance. As a
result, burr occurs on the periphery of the blanked hole, and high-quality
boring process cannot be performed. Moreover, since the punch 106 and the die
125 carried out the blanking with burr, the gap causes the cutting edges of
the
punch 106 and the die 125 to be nicked. In order to attain the high-quality
pressing process, the passive cam 107 should be moved straight and exactly
without non-linear movement.
Further, since inclined weight due to the forming process is placed on the
passive cam, the passive cam is apt to shift. Therefore, this shift is
eliminated, and thus a product should be processed into a desired shape.
Furthermore, it is necessary to improve processing accuracy of a cam die as
much as possible.
Accordingly, the present invention is devised in such points in view. In
order to easily remove a passive cam from a bottom force when the passive cam
to which a processing member such as a punch was mounted is repaired, the
present invention provides a press apparatus having an actuation cam in a top
force, a passive cam in a bottom force which is contact-pressed and driven by
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the actuation cam and to which a processing member such as a punch is mounted,
a guide base in the bottom force for sliding and guiding the passive cam,
guide
posts which are mounted across the guide base and move so as to slide the
passive cam and force applying means for applying a force to the passive cam
towards an opposite-work side. In such a press apparatus, the passive cam is
fitted into the guide base so that when the guide posts mounted across the
guide base are drawn out, the passive cam is lifted up and dismounted.
In addition, according to the present invention, the passive cam advances
straight and moves through the guide posts in order to attain high-quality
pressing process.
Further, according to the present invention the passive cam is externally
fitted into the guide base in order to lift and dismount the passive cam.
Furthermore, according to the present invention, inclined weight is placed
on the passive cam due to the forming process or the like, and thus the
passive
cam is apt to shift. In order to eliminate this shift and to process a product
into a desired shape, the sliding surface of the passive cam and the guide
base
has a vertical surface.
In addition, in order to improve processing accuracy using a cam die as
much as possible, the present invention provides a press apparatus having an
actuation cam in a top force, a passive cam in a bottom force which is contact-
pressed and driven by the actuation cam and to which a processing member such
as a punch is mounted, a guide base in the bottom force for sliding and
guiding
the passive cam, guide posts which are mounted across the guide base and move
so as to slide the passive cam and force applying means for applying a force
to
the passive cam towards an opposite-work side. In such a press apparatus, the
guide posts are mounted across the nearest vicinity of a portion of the
passive
cam where the processing member such as the punch is mounted and are
positioned
on both sides of the processing member.
BRIEF DESCRIPTION OF THE DRAWINGS
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FIG. 1 is a side view showing a press apparatus according to a concrete
embodiment of the present invention and showing a cross section of one portion
of a top force in an on-lowering state.
FIG. 2 is a side view showing a cross section of one portion in a bottom
dead center.
FIG. 3 is a sectional view of a middle portion of FIG. 2.
FIG. 4 is a front view taken along line IV-IV of FIG. 2.
FIG. 5 is a back view taken along line U-U of FIG. 2.
FIG. 6 is a longitudinal section of a conventional press die.
FIG. 7 is a sectional view showing a guide section of a passive cam in a
conventional press apparatus.
PREFERRED EMBODIMENT OF THE INDENTION
There will be detailed below the preferred embodiments of the present
invention with reference to the drawings.
FIG. 1 is a side view showing a press apparatus according to one concrete
embodiment of the present invention and showing a section of one portion of a
top force in an on-lowering state. FIG. 2 is a side view showing a section of
one portion in a bottom dead center. FIG. 3 is a sectional view of a middle
portion of FIG. 2. FIG. a is a front view taken along line IU-IV of FIG. 2.
FIG. 5 is a back view taken along line U-V of FIG. 2.
The present embodiment refers to an example that a hole is bored in a work.
As shown in FIGS. 1 and 2, a locating member 3 for locating a work W is
fixed onto a substrate 2 in a bottom force 1 by a bolt 4.
A passive cam 6 for mounting a boring punch 5 for boring the work W is
positioned so as to face the work W. The passive cam 6 is provided onto guide
posts 8 which are mounted across a guide base 7 so as to slide, and the guide
base 7 is fixed to the substrate 2 by a bolt 9.
A mounting plate 10 is fixed to a work processing side of the passive cam 6
by a bolt 11. A punch plate 12 is fitted into the mounting plate 10 by a bolt
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13 so that the boring punch 5 is mounted. A force is applied to a stripper
plate 14 by a cushion rubber 15, and the stripper plate 14 presses the work W
before a hole is bored in the work W. A reference numeral 16 is a die which is
fitted to the boring punch 5 and carries out piercing.
Supporting plates 17 and 18 are fittingly jointed with the forward and
backward ends of the guide base 7 by bolts 19 and 20. Here, a side which is
close to the work W is referred to as forward, and a side which is far from
the
work W is referred to as backward. The guide posts 8 are mounted across the
supporting plates 17 and 18 horizontally, and bushes 21 and 22 which were
pressed into the passive cam 6 were externally fitted into the guide posts 8
so
that the passive cam 6 is provided so as to slide. A length of the passive cam
6 between the supporting plates 17 and 18 is set so as to be shorter than a
distance between the supporting plates 17 and 18. This is because the passive
cam 6 can move in the lateral direction.
The guide posts 8 are brought to the boring punch 5 as close as possible in
order to improve boring accuracy using the boring punch 5. Moreover, the guide
posts 8 are positioned respectively on both sides of the boring punch 5,
namely,
both sides of the boring punch 5 in the vertical direction of FIGS. 1 and 2
(not
shown). Since the passive cam 6 is guided by the guide posts 8 so as to slide
and the boring punch 5 is fixed to the passive cam 6, as the boring punch 5 is
closer to the guide posts 8, it moves more accurately. Therefore, accurate
processing can be carried out. When the guide posts 8 are positioned
respectively on both the sides of the boring punch 5, the boring punch 5 can
be
held in more accurate and exact position compared with the case that only one
guide post 8 is fitted into the passive cam 6, and thus accurate processing
can
be carried out.
A receiving plate 23 is positioned vertically on a backward end surface of
the passive cam 6 and is fixed by a bolt 24. A force is applied to the lower
end portion of the receiving plate 23 by a coil spring 26 which is positioned
in
a central cavity section 25 (see FIG. 3) of the guide base 7. A supporting pin
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27 is positioned horizontally in the center of the cavity section 25, and its
base end is fittingly joined with the supporting plate 17, and its point is
inserted into the supporting plate 18. The coil spring 26 is externally fitted
to the supporting pin 27, and washer plates 28 are fitted into the supporting
pin 27 so as to intervene between the backward end of the coil spring 26 and
the front surface of the receiving plate 23.
FIG. 3 shows a state that the passive cam 6 is fitted into the guide base 7.
The passive cam 6 is externally fitted into the guide base 7. A vertical wear
plate 31 and an oblique wear plate 32 are fixed to the inner surface of the
passive cam 6 respectively by bolts 33 and 34. A vertical sliding surface 35
and an oblique sliding surface 36, which match with the vertical wear plate 31
and the oblique wear plate 32, are formed on the guide base ~. Even if the
passive cam 6 is about to shift due to the forming process or the like, the
passive cam 6 is fitted into the guide base 7 so as to stretch thereover, and
the vertical wear plate 31 of the passive cam 6 is guided on the vertical
sliding surface 35 of the guide base 7. Therefore, the passive cam 6 does not
shift, and thus a high-quality product can be processed.
In addition, as shown in FIGS. 4 and 5, since the passive cam 6 is slid by
the two guide posts 8 having a circular section which are mounted across both
the upper sides of the supporting plates 17 and 18, unstable sliding does not
occur, namely, the passive cam 6 advances exactly, and thus accurate
processing
can be carried out.
Further, as shown in FIGS. 1 and 2, a base end small-diameter section 37 of
the guide post 8 is fitted into a small-diameter hole 38 of the supporting
plate 17, and a point section 39 of the guide post 8 is fitted into a
supporting
hole 40 of the supporting plate 17. A stop plate 42, which contacts with point
surfaces 41 of the guide posts 8, is fixed to the backward surface of the
supporting plate 18 by a bolt 43 so that the guide posts 8 do not slip out of
the supporting plates 17 and 18. When the cutting edge of the boring punch 5
is nicked and thus it should be repaired, the bolt 43 is released so that the
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stop plate 42 is removed, and a bolt is fitted into screw holes 44 which were
chopped on the point surfaces 41 of the guide posts 8. Then, the guide posts 8
are moved backward (the right direction in the drawing) so as to be drawn out.
Since the small-diameter sections 3~ of the guide posts 8 are simply fitted
into the small-diameter holes 38, the guide posts 8 can be drawn out easily by
moving them in the right direction.
After the guide posts 8 are removed from the passive cam 6 and the guide
base 7, when the passive cam 6 is lifted up, as shown in FIG. 3, the passive
cam
6 is guided on the vertical sliding surface 35 of the guide base 7 so as to
easily move upward. As a result, the passive cam 6 can be dismounted, and the
boring punch 5 or the like can be dismounted easily from the passive cam 6.
Therefore, the repairing workability is improved.
Here, a wear plate 51 is fixed to a slanted surface of the backward surface
of the passive cam 6 by a bolt 52.
In a top force 61, a passive cam 63, which contacts with the wear plate 51
on the backward surface of the passive cam 6 in a bottom force 1 and presses
and
drives the passive cam 6, is fixed to a substrate 64 by a bolt 65.
The following will describe an operation of this press apparatus.
First, as shown in FIG. 1, the work W is placed on the locating member 3 in
the bottom force 1.
Next, the top force 61 is lowered. FIG. 1 shows an on-lowering state of
the top force 61.
The passive cam 63 in the top force 61 is brought into contact with the
wear plate 51 of the passive cam 6 in the bottom force 1 so as to drive the
passive cam 6 towards the work W against the applied force of the coil spring
26. At this time, the passive cam 6 is guided by the guide posts 8 so as to
advance straight without non-linear movement.
The work W is pressed by the stripper plate 1~, and the boring punch 5 is
fitted into the die 16 so as to bore a hole. FIG. 2 shows the top force 61 in
a bottom dead center.
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When the boring process is completed, the top force 61 starts to lift. The
work W is pressed by the stripper plate 14 and the boring punch 5 moves
backward, and the passive cam 6 is also moved backward by the applied force of
the coil spring 26. The top force 61 stops in a top dead center.
When a nicked cutting edge of the boring punch 5 is repaired, the bolt 43
is released, and the stop plate 42 is removed. A bolt or the like is fitted
into the screw holes 44 of the guide posts 8, and the guide posts 8 are drawn
out backward. At this time, since the guide posts 8 do not have a section
whose
diameter is larger than that of the supporting holes 40, they can be drawn out
smoothly.
In addition, as is clear from FIG. 3, the coil spring 26 and the supporting
pin 27 are positioned in the cavity section 25 of the guide base 7, and the
passive cam 6 is externally fitted into the guide base 7. For this reason,
when the passive cam 6 is lifted up, it can be lifted up easily because of no
interference, and the passive cam 6 is guided on the vertical sliding surface
35 of the guide base 7 so as to be able to be lifted up smoothly.
In addition, since the passive cam 6 is guided by the two guide posts 8
having a circular section, it advances straight without non-linear movement,
and thus accurate processing can be carried out.
Further, since the passive cam 6 is externally fitted into the guide base 7,
the passive cam 6 can be lifted up.
Furthermore, since the sliding surface of the passive cam 6 and the guide
base 7 has a vertical surface, the passive cam 6 can be lifted up smoothly.
In addition, the guide posts 8 are provided across the nearest vicinity of
the portion of the passive cam 6 where the processing member such as the
boring
punch 5 is mounted, and they are positioned on the both sides of the
processing
member. As a result, processing accuracy can be improved as much as possible.
The above embodiment described the boring process, but needless to say, the
present invention can be applied to the other pressing processes such as a
notching process and a forming process.
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In addition, the above embodiment described an example that the coil spring
is used as force applying means, but this means is not limited to this.
Therefore, elastic materials such as rubber and urethane rubber or a gas
spring
may be used.
Further, in the above embodiment, the guide base is constituted so that the
guide posts are mounted horizontally, but the guide posts can be slanted. In
this case, the guide base requires a height higher than a certain value in
order to make it possible to draw out the guide posts.
As mentioned above, a press apparatus has an actuation cam in a top force,
a passive cam in a bottom force which is pressed and driven by the actuation
cam
and to which a processing member such as a punch is mounted, a guide base in
the bottom force for sliding and guiding the passive cam, guide posts which
are
mounted across the guide base and move so as to slide the passive cam, and
force
applying means for applying a force to the passive cam towards an opposite-
work
side. In such a press apparatus, the passive cam is fitted into the guide base
so that when the guide posts mounted across the guide base are drawn out, the
passive cam is lifted up so as to be able to be dismounted. As a result, when
the passive cam to which the processing member such as the punch was mounted
is
repaired, the passive cam can be removed easily from the bottom force.
In addition, since the passive cam advances straight through the guide
posts, the present invention can perform high-quality pressing process.
Further, since the passive cam is externally fitted into the guide base,
the passive cam is lifted up so as to be able to be dismounted.
Furthermore, since the sliding surface of the passive cam and the guide
base has a vertical surface, inclined weight is placed on the passive cam at
the time of the forming process or the like, and thus the passive cam is apt
to
shift. However, the present invention eliminates this shift and can process a
product into a desired shape.
In addition, when the passive cam is lifted up, the sliding surface serves
as a guiding surface, and thus the passive cam can be lifted up smoothly.
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Further, a press apparatus has an actuation cam in a top force, a passive
cam in a bottom force which is contact-pressed and driven by the actuation cam
and to which a processing member such as a punch is mounted, a guide base in
the
bottom force for sliding and guiding the passive cam, guide posts which are
mounted across the guide base and move so as to slide the passive cam, and
force applying means for applying a force to the passive cam towards an
opposite-work side. In such a press apparatus, the guide posts are mounted
across the nearest vicinity of a portion of the passive cam where the
processing
member such as the punch is mounted and are positioned on both the sides of
the
processing member. Therefore, processing accuracy can be improved by a cam die
as much as possible.
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