Note: Descriptions are shown in the official language in which they were submitted.
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TITLE OF THE INVENTION
Die including slide cam
BACKGROUND OF THE INVENTION
The present invention rela~es to a die including a slide
5 cam.
In the ordinary die, a lower die and an upper die are
mounted respectively on a bed and a ram of a pressing machine
so that piercing and forming processings can be accomlished
by ascending and descending the upper die. Since the upper
10 die is moved up and down, the transverse machining is
effected by converting the vertical machining force
horizontally by using a cam member.
This will be explained by the example of piercing the
side wall of a work with the die including the cam member.
As shown in Fig. 5 and Fig. 6, to the lower die 101, a
positioning member 104 which positions the work 103 on a base
plate 102 is secured. At a position opposing to a hole 105 to
be pierced in the side wall of the work 103, a driven cam 107
including a punch 106 is disposed slidably. A heel 108 is
20 secured to the rear side of the driven cam 107. A coil spring
109 is installed around the top side of a rod 110 which is
threaded into the driven cam 107 inserted through the heel
108, and one end of the coil spring 109 is contacted to the
heel 108, and a nut 112 is screwed onto the other end of the
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coil spring 109 via a washer 111 to urge such that the driven
cam 107 is drawn back after piercing the work 103. A driving
cam 118 is secured to a base plate 117 o~ the upper die 116
at a position opposing to the driven cam 1~7.
When the upper die 116 is descended, the driving cam 118
moves the driven cam 107 forward against the biasing force of
the coil spring 109 to pierce the hole 105 in the work 103 by
the punch 106 and a die 125, and when the upper die 116 is
ascended, the driven cam 107 is moved rearward by the biasing
10 force of the coil spring 109.
For piercing the side wall of the work 105, as afore-
mentioned, the driven cam 107 including the punch 106 slides
on the base plate 102 while approaching to and parting from
the work 104. The driving cam 107 has to slide accurately to
15 pierce by the punch 106 and die 125, therefore, flanges 121
are projected on lower opposite sides of the driven cam 107,
and side guide plates 122 and upper guide plates 123 for
guiding the flanges 121 are fixed to the base plate 102.
In the die aforementioned, in order to allow the driving
20 cam 107 to slide between predetermined positions, the side
guide plates 122 for guiding the side faces of the flanges
121 projected on the sides of the driven cam body 107a, and
the upper guide plates 123 for guiding the upper faces of the
flanges 121 are disposed. Since these flange 121, side guide
25 plate 122 and upper guide plate 123 are provided, a length 1
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is projected respectively on opposite sides of the body
portion 107a of the driven cam 107, the length ~ being
usually about 100 to 150 mm at a minimum, thereby a large
space is occupied on the base plate 102 of the lower die 101
5 of the press die.
Accordingly, a large space is occupied when a cam
mechanism is provided on the die. Since the large space is
occupied by providing the cam mechanism, the die size is
restricted by the bed area of the pressing machine and the
10 necessary members may not be installed on the die, therefore,
sometimes the machining processes must be increased and the
die has to be added.
A wear plate 124 provided on the tip of the flange 121
projected on the side of the body portion 107a of the driven
lS cam 107 wears as the driven cam 107 repeats the sliding
operations, producing a gap between the side guide plate 122,
thereby the driven cam 107 can not slide linearly and tends
to meander by the existence of the gap. The punch 106
installed on the driven cam 107 also moves similarly in a
20 serpentine fashion, thus the punch 106 is unable to punch in
the state wherein a proper clearance is maintained circularly
around the die 125, producing burrs around the punched hole,
thus a high quality punching was impossible. Besides, due to
the punching by the punch 106 and die 125 which produce the
25 burrs, edges of the punch 106 and die 125 were damaged.
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Therefore, in view of the circumstances aforementioned,
the present invention is directed to a die including a cam
member, which can be designed in compact in addition to the
necessary function given as the cam member, and in order to
5 accomplish high quality machining without moving the cam
member in a serpentine fashion, said die including a slide
cam comprising; a slide cam base on the tip of which a poly-
hedral guide portion is formed; the slide cam which holds and
supports the polyhedral guide portion of the slide cam base
10 and slides along the polyhedral guide portion, and onto which
machining tools such as a punch and a trimming edge are
mounted; an elastic body interposed between the slide cam
base and the slide cam for urging the slide cam, and a driv-
ing cam contacted to the slide cam for moving the same.
The slide cam, when the upper die is descended, moves
transversely between the driving cam and the slide cam base
for pressing works such as piercing and trimming. When the
works are completed and the upper die is ascended, the slide
cam urged by the elastic body is returned.
20 BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a longitudinal sectional view of a die
including a slide cam of one specific embodiment of the
present invention at a bottom dead point,
Fig. 2 is a sectional view taken in the direction of the
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arrows substantially along the line II-II of Fig. 1,
Fig. 3 is a sectional view taken in the direction of the
arrows substantially along the line III-III of Fig. 1,
Fig. 4 is a longitudinal sectional view of a cam
5 mechanism of the present invention at a top dead point,
Fig. 5 is a front view of a press die using a
conventional cam mechanism, and
Fig. 6 is a side view of Fig. 5.
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be particularly described as
follows, in response to one specific embodiment shown in
Figs. 1 to 4 of the accompanying drawings.
Fig. 1 is a longitudinal sectional view of a die
including a slide cam of one specific embodiment of the
15 present invention at a bottom dead point, Fig. 2 is a
sectional view taken in the direction of the arrows
substantially along the line II-II of Fig. 1, Fig. 3 is a
sectional view taken in the direction of the arrows
substantially along the line III-III of Fig. 1, and Fig. 4 is
20 a longitudinal sectional view at a top dead point.
An example described in the embodiment involves a work
pierced and trimmed at its lower end.
On a base plate 2 of a lower die 1, a positioning member
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4 which positions the work 3 is fixed by means of bolts 5. In
the vicinity of the positioning member 4, a driving cam 8,
onto which a guide member 6 whose upper surface is formed
into an inclined plane which slants as approaching to the
5 positioning member 4 so as to contact to a V-shaped groove is
installed with bolts 7, is fixed by bolts 9.
On a vase plate 12 of an upper die 11 opposing to the
driving cam 8, a slide cam base 13 is secured by bolts 14.
The top of the slide cam base 13 is formed into a tetrahedral
10 guide portion 16, which is generally quadrangular in cross
section and provided with the crest line 15 at the lower end,
and having an inclined plane which, symmetrically with the
inclined plane of the driving cam 8, slants upward as
approaching to the positioning member 4.
lS A slide cam 17 which holds and supports the tetrahedral
guide portion 16 of the slide cam base 13 slidably, and
slides on the guide member 6 of the driving cam 8 is
disposed.
The slide cam 17 comprises a machining member 19 onto
20 which a V-shaped groove member 18, punch and cutting edge are
installed. The V-shaped groove member 18 is positioned by a
key 20 driven into an opposing face of the machining member
19, and fixed by bolts 22 by raising a stopper 21.
The upper end of the slide cam 17 is formed into a V-
25 shaped groove which has the same inclined plane as that of
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the tetrahedral guide portion 16 of the slide cam base 13 andreceives the tetrahedral guide portion 16, and provided with
wear plates 23 fixed with bolts 24 to support lower planes 25
of the tetrahedral guide portion 16 of the slide cam base 13,
5 upper planes 26 bei~g urged by biasing plates 28 fixed by
bolts 27 to the slide cam 17, which is disposed slidably on
the tetrahedral guide portion 16 of the slide cam base 13.
On the lower surface of the slide cam 17, a sliding
member 29 which slides on the guide member 6 of the driving
10 cam 8 as contacting its V-shaped groove thereto is fixed by
bolts 30.
On the work machining side of the slide cam 17, a
mounting plate 41 is installed by a bolt 42. A punch 43 is
installed by fixing a punch plate 44 to the mounting plate 41
15 by means of a bolt 45. A trimming edge 51 is fixed to the
mounting plate 41 by means of a bolt 46. A stripper plate 47
to which a cushion rubber 48 is urged the work 3 before it
is pierced and trimmed.
The numeral 49 qenerally indicates a die which is
20 engaged to the punch 43 for piercing, and the numeral 50
denotes a cutting edge which trims the edges of the work 3 in
cooperation with the trimming edge 45.
For retreating the slide cam 17' after machining, a
retaining hole 61 is formed at the rear end portion of the
25 tetrahedral guide portion 16 of the slide cam base 13, and a
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support plate 62 is disposed at a position opposing to the
retaining hole 61 and secured to the slide cam 17 by means of
a bolt 63. An elastic body 64 such as a coil spring is
provided between the retaining hole 61 and the support plate
5 62. When the upper die 11 is ascended, the slide cam 17 is
retreated by the biasing force of the elastic body 64. For
the purpose of stopping the retreatment of the slide cam 17,
the stopper 21 raised on the slide cam 17 is engaged to an
end portion 65a of a stopping groove 65 formed in the crest
10 line at the lower portion of the tetrahedral guide portion 16
of the slide cam base 13. And, for the safety sake, a safety
stopper 66 is screwed into the retaining hole 61 to fix the
position of the coil spring, and at the same time, the safety
stopper 66 is extended through the support plate 62 and
15 provided with a head portion 66a at its end, so as to stop
the stopper 21 by the support plate 62 which is collided
against the head portion 66a, in case the stopper 21 does not
stop at the end portion 65a of the stopping groove 65.
Also, for retreating the slide cam 17 forcibly when the
20 upper die 11 is ascended, a return plate 71 is secured to the
slide cam 17 with bolts 72, and engaged to the driving cam 8
at the lower end thereof.
Next, the operation of the die is described.
As shown in Fig. 4, the work 3 is placed on the
25 positioning member 4 and the upper die 11 is descended.
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Fig. 4 shows a top dead point, where the slide cam 17
disposed slidably on the tetrahedra:L guide portion 16 of the
slide cam base 13 installed on the base plate 12 of the upper
die 11, is in contact with the stopper 21.
When the upper die 11 is descended from this state, the
sliding member 29 of the slide cam 17 contacts to the guide
member 6 of the driving cam 8, and the slide cam 17 proceeds
toward the work 3 between the driving cam 8 and the slide cam
base 13 as the upper die 11 is descended, to pierce the work
10 3 by the punch 43 and to trim the lower portion of the work 3
with the trimming edge 51.
The state wherein piercing and trimming are effected by
the punch 43 and the trimming edge 51, and the upper die 11
is at the bottom dead point is shown in Fig. 1.
Thereafter, when the upper die 11 is ascended, the
urging force of the elastic body 64 is transmitted to the
slide cam 17 from the support plate 62 to retreat the slide
cam 17, which is stopped by its stopper 21 contacting to the
end portion 65a of the stopping groove 65.
Since the return plate 71 is provided on the slide cam
17, when the slide cam 17 fails to retreat for some circum-
stance or other, the return plate 71 is engaged to the
driving cam 8 to retreat the slide cam 17 forcibly.
In the embodiment aforementioned, though the example in
25 which the slide cam base 13, slide cam 17 and driving cam 8
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are arranged in order from top to bottom is described, they
may be arranged in order of the driving cam 8, slide cam 17
and slide cam base 13 from top to bottom.
That is, a unit comprising the slide cam base 13, slide
5 cam 17 and the driving cam 8 may be used reversely.
Furthermore, though the example of piercing and trirnming
was described in the embodiment, it is to be understood that
the present invention may be applied to other forming and
bending processings.
Besides, when sizes of the slide cam base 13, slide cam
17 and driving cam 8 are standardized, machining of works
having various sizes can be performed immediately.
As described heretofore, since the present invention is
directed to a die including a slide cam compressing: a slide
15 cam base on the top of which a polyhedral guide portion is
formed; the slide cam which holds and supports the polyhedral
guide portion of the slide cam base and slides along the
polyhedral guide portion, and onto which machining tools such
as a punch and a trimming edge are mounted; an elastic body
20 interposed between the slide cam base and the slide cam for
urging the slide cam; and a driving cam contacted to the
slide cam for driving the same, a cam mechanism can be
constituted without disposing cam guiding flanges, side guide
plates and upper guide plates, and the cam mechanism can be
25 provided on the die in a minimum space.
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Since a large space is occupied by the conventional cam
mechanism, the size of die is restricted by the bed area of
the pressing machine, 50 that the necessary members can not
be provided on the die, thus the machining processes must be
5 increased and the die has to be added, but in the present
invention, for reasons aforementioned, it is not necessary to
add the die.
In the cam mechanism of the present invention, since
little space is occupied, ~or the work having a curved
10 surface, machining can be effected from the direction
suitable to the curved surface or from the normal direction
to the curved surface, so that in case of piercing a circular
hole, it can be finished in a true circle and not in an
ellipse, improving machining quality.
Also, in the present invention, a die can be made
smaller and lighter at low cost in a short period of the
time. Since the die is small, it can be machined with small-
sized machine tools and cranes in die machining facilities.
Moreover, in the die of the present invention, since the
20 slide cam is held and supported by the slide cam base
slidably, even when the sliding portion is worn by the long
duration of use of the die, the cam does not meaner as the
conventional die, but moves linearly, thus a high quality
pressing work can be accomplished. Besides, since the slide
25 cam base moves in the linear direction precisely, edges of
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the punch, die and cutting edge do not break. In the embodi-
ment of the present invention, since the sliding faces of the
slide cam and the driving cam are formed into the V-shaped
groove, there is no possibility that the cam meanders.
Also, in the present invention, as a sliding mechanism
is provided in the center portion of the cam, it can be
divided into small sections, and as compared with the
conventional cam in which the flanges are protected on
opposite sides, the cam divided into the small sections can
10 be held and supported at many locations, so that when
compared with the conventional large member which cam be held
only on the both sides, the cam can be held securely.
Meanwhile, when cam parts are standardized, the present
invention can be applied immediately to the machining of the
15 wor~s having various sizes.
Though abrasion tests were run by the inventor for
300,000 times, using the die including the slide cam having
the construction of the embodiment shown; the wear rate was
about (1.5 to 2.5) x 1/100 mm and the wear rate of the
20 ordinary slide cam was about 5/100 mm x 1/3, showing the good
results.
