Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Reexamination Certificate
2000-12-15
2002-11-12
Larson, Lowell A. (Department: 3725)
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
C072S344000
Reexamination Certificate
active
06477883
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a die block apparatus, and particularly to a die block apparatus used for shaping workpieces by way of die stamping.
2. Related Art
With rapid developments in manufacturing industry, the demand for precision components is constantly increasing. Industrial dies need to produce more and more precise components.
A conventional die block apparatus for shaping workpieces by way of die stamping is disclosed in
FIG. 5. A
die block
86
includes a stamping hole
88
, and four piston holes
94
arranged around the periphery of the stamping hole
88
. Each piston hole
94
accommodates a pusher pad
90
and a spring
92
thereunder. A die
80
is moved downwardly to act on a workpiece
82
. A formed portion
84
of the workpiece
82
is thus created. Simultaneously, the pusher pads
90
compress the springs
92
. When the die
80
is withdrawn, the springs
92
decompress to cause the pusher pads
90
to move upwardly. The pusher pads
90
force the workpiece
82
upwardly, thereby releasing the formed portion
84
from the die block
86
.
However, the piston holes
94
must be arranged in the immediate vicinity of the stamping hole
88
. Consequently, this type of apparatus is not suitable for certain kinds of workpieces.
FIG. 6
shows an example of a workpiece
96
which requires a flanged hole
97
near three edges of a portion A of the workpiece
96
. The flanged hole
97
has a diameter of, say, 3.5 mm. Only a single pusher pad
90
can be arranged under portion A, inwardly from the hole
97
. During unloading, the pusher pad
90
forces the workpiece
96
upwardly, but not uniformly. Consequently, the workpiece
90
frequently sustains damage and distortion. This lowers the precision of the finished workpiece
96
.
Therefore, another type of die block apparatus has been developed. The apparatus has a pusher pad directly under the stamping hole, which ensures that the pusher pad forces a workpiece uniformly upwardly. However, the diameter of the pusher pad must fit to the diameter of the stamping hole. When the diameter of the stamping hole is very small, as shown in
FIG. 6
, the pusher pad is easily damaged.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a die block apparatus for shaping workpieces which ensures the precision of the workpieces.
Another object of the present invention is to provide a die block apparatus for shaping workpieces which readily unloads the workpieces.
A further object of the present invention is to provide a die block apparatus for shaping workpieces which easily forms various kinds of workpieces.
To achieve the above-mentioned objects, a die block apparatus for shaping workpieces by way of die stamping in accordance with the present invention comprises a die block, a first sliding block, a second sliding block and a stopper block. The die block is dimensioned to receive the first and second sliding blocks and the stopper block. The first sliding block comprises a body, a pair of inclined rails extending from opposite lateral sides of the body, and a protrusion extending outwardly from the body. The body has a vertical inner surface. A groove is defined in the inner surface. The protrusion has a vertical outer surface. The second sliding block is a mirror image of the first sliding block. The stopper block comprises a base and a vertical beam. The stopper block defines a vertical contact surface, for abutting the outer surface of the first sliding block.
Other objects, advantages and novel features of the present invention will be drawn from the following detailed embodiments of the present invention with attached drawings, in which:
REFERENCES:
patent: 1766098 (1930-06-01), Booth
patent: 1977163 (1934-10-01), Wilcox
patent: 3693399 (1972-09-01), Chirco
patent: 6189361 (2001-02-01), Seki et al.
Chung Wei-Te
Hon Hai - Precision Ind. Co., Ltd.
Larson Lowell A.
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