BACKGROUND OF THE INVENTION
[0001] 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.
[0002] 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 force in the lateral direction by using a cam member.
[0003] 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.
[0004] 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.
[0005] The top force 116 is lowered and the actuation cam 118 advances the passive cam 107
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.
[0006] 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 107, 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.
[0007] 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 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.
[0008] 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.
[0009] 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.
[0010] Furthermore, it is necessary to improve processing accuracy of a cam die as much
as possible.
[0011] 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 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.
[0012] 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.
[0013] 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.
[0014] 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.
[0015] 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
[0016]
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 V-V 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 INVENTION
[0017] There will be detailed below the preferred embodiments of the present invention with
reference to the drawings.
[0018] 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. 14 is
a front view taken along line IV-IV of FIG. 2. FIG. 5 is a back view taken along line
V-V of FIG. 2.
[0019] The present embodiment refers to an example that a hole is bored in a work.
[0020] 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.
[0021] 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.
[0022] 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 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.
[0023] 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.
[0024] 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.
[0025] 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 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.
[0026] 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 7. 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.
[0027] 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.
[0028] 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 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 37 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.
[0029] 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.
[0030] Here, a wear plate 51 is fixed to a slanted surface of the backward surface of the
passive cam 6 by a bolt 52.
[0031] 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.
[0032] The following will describe an operation of this press apparatus.
[0033] First, as shown in FIG. 1, the work W is placed on the locating member 3 in the bottom
force 1.
[0034] Next, the top force 61 is lowered. FIG. 1 shows an on-lowering state of the top force
61.
[0035] 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.
[0036] The work W is pressed by the stripper plate 14, 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.
[0037] 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.
[0038] 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.
[0039] 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.
[0040] 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.
[0041] Further, since the passive cam 6 is externally fitted into the guide base 7, the
passive cam 6 can be lifted up.
[0042] 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.
[0043] 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.
[0044] 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.
[0045] 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.
[0046] 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.
[0047] 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.
[0048] In addition, since the passive cam advances straight through the guide posts, the
present invention can perform high-quality pressing process.
[0049] 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.
[0050] 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.
[0051] 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.
[0052] 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.