Riveting die apparatus incorporating positioning device

Details Riveting die apparatus incorporating positioning device Riveting die apparatus incorporating positioning device

2000-12-22

2002-11-19

Watson, Robert C. (Department: 3723)

Metal working

Means to assemble or disassemble

Overedge assembling means

Reexamination Certificate

active

06481076

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a riveting die apparatus, and particularly to a riveting die apparatus with a positioning device.
2. Related Art
A conventional riveting die apparatus, as shown in
FIG. 2
, comprises an upper die
10
and a lower die
20
. A guide post
11
depends from the upper die
10
. A pair of punches
12
respectively depends from the upper die apparatus
10
on opposite sides of the guide post
11
. Each punch
12
has a conical head
124
. The punches
12
are shorter than the guide post
11
. The lower die
20
comprises a lower mold plate
22
, and a guide bushing
26
. A pair of through holes
24
is defined in the plate
22
, for respectively receiving the conical heads
124
of the punches
12
.
In operation, a pair of stacked workpieces (not shown) is placed over one through hole
24
. Holes (not shown) defined in the workpieces are aligned with the through hole
24
. Similarly, another pair of similar stacked workpieces is placed over the other through hole
24
of the lower mold plate
22
. The upper die
10
is moved downwardly. The guide post
11
is firstly received into the guide bushing
26
, thereby guiding movement of the upper die
10
. The conical heads
124
of the punches
12
then enter the holes of the workpieces. The conical heads
124
of the punches
12
then enter the through holes
24
of the lower mold plate
22
. The two pairs of stacked workpieces on opposite sides of the lower mold plate
22
are thus respectively riveted together.
However, the die apparatus does not itself provide any means for correctly positioning the workpieces before the upper die
10
is moved downwardly. Workpieces are often not precisely positioned on the lower mold plate
22
, particularly when the die apparatus operates continuously at high speed. Thus imperfect and damaged workpieces are frequently formed.
It is strongly desired to provide a die apparatus with a positioning device which overcomes the above problems encountered in the prior art.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a riveting die apparatus with a positioning device which readily and precisely positions workpieces.
To achieve the above-mentioned object, a riveting die apparatus incorporating a positioning device in accordance with the present invention comprises an upper die and a lower die. The upper die comprises a pair of punches and a guide post between the punches. The lower die comprises a lower mold plate. The lower mold plate defines two through apertures corresponding to the punches, and two piston holes respectively in communication with the through apertures. Two blocks are secured below the lower mold plate. Each block defines a blind hole in communication with the corresponding piston hole of the lower mold plate. A spring is accommodated in each combined piston hole and blind hole. A rod is movably received in each through aperture. A base of each rod is accommodated in the piston hole, and abuts the corresponding spring. A guide bushing is mounted on the lower mold plate for guiding movement of the guide post. Workpieces placed on the lower mold plate are precisely positioned by the rods prior to operation of the die apparatus.


REFERENCES:
patent: 3771480 (1973-11-01), Johnson
patent: 4531279 (1985-07-01), Gunter

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