Cutting – Means to drive or to guide tool – With simple rectilinear reciprocating motion only
Reexamination Certificate
1999-01-20
2001-04-24
Hughes, S. Thomas (Department: 3726)
Cutting
Means to drive or to guide tool
With simple rectilinear reciprocating motion only
C083S635000, C083S821000, C083S588000, C072S452900
Reexamination Certificate
active
06220137
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a press apparatus. More specifically, the present invention relates to a press apparatus which makes it easy to remove a passive cam from the a lower die so as to improve workability. Moreover, the present invention relates to a press apparatus which is constituted so that a guide post is mounted across the nearest vicinity of a portion of the passive cam to which a processing member such as a 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.
2. Description of the Background Art
A normal press apparatus is constituted so that a lower die is mounted to a bed of a press machine and a an upper die is mounted to a ram, and when the upper die is lifted and lowered, boring and forming processes are performed. Since the upper die 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.
The description will be given as to an example where 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 lower die
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 rear 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 upper die
116
so as to be in a position which faces the passive cam
107
.
The upper die
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 upper die
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 lower die
101
. 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 lower die
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 mounted state shown in
FIG. 7
, since the repair is impossible, the passive cam
107
should be removed from the lower die
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 lower die
101
. Therefore, it takes a long time to remove the passive cam
107
from the lower die
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 a 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.
SUMMARY OF THE INVENTION
Accordingly, the present invention is devised in such points in view. In order to easily remove a passive cam from a lower die when the passive cam to which a processing member such as a punch was mounted to be repaired, the present invention provides a press apparatus having an actuation cam in an upper die, a passive cam in a lower die 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 lower die 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 onto 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 along the guide posts in order to attain a high-quality pressing process.
Further, according to the present invention, the passive cam is externally fitted onto 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 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.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
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Birch & Stewart Kolasch & Birch, LLP
Hughes S. Thomas
Jimenez Marc
Umix Co., Ltd.
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