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DESCRIPTION JPS63278494

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DESCRIPTION JPS63278494
[0001]
Industrial Application Field of the Invention In general, the speaker was constructed as shown in
FIG. That is, the frame 1 is coupled onto the magnetic circuit configured by laminating and
combining the ring-shaped magnet 10 and the ring-shaped upper plate 9 on the plate of the
bottom plate 11, and the peripheral portion of the frame 1 The gasket 3 and the cone 4 ░ dust
cap 6 are connected to each other, and the voice coil 8 supported by the damper 7 is connected
to the center of the magnetic gap of the magnetic circuit in the center. The terminal 2 and the
gold wire 5 are a relay terminal and a lead for guiding an audio signal to the voice coil 8.
Problems to be solved by the invention In such a speaker, as shown in FIG. 3 in the head-feeding
press Nako which is a method of manufacturing the frame 1 for supporting the vibration system
parts, the steel plate 16 is In order to prevent breakage, holes of blanking 16 are required. The
steel plate 16 (width 18 and pitch 17), which is much larger than the dimension of the frame 1
for the blanking 16, is required, and the material yield of the steel plate 16 is poor. In order to
improve the material yield, it is desirable to make the hole size of blanking 16 as small as
possible, but by making it small, the press die (upper die punch size) for punching the holes of
blanking 16 is small. As a factor of mold breakage, the width 19 of the hole of blanking 16 was
limited to smm. The present invention is intended to provide a method of manufacturing a frame
that can solve such problems. SUMMARY OF THE INVENTION The present invention is a method
of manufacturing a frame having a slit between the forming portions of each frame of steel plate
material, and drawing, forming and punching of the frame. By using the action slit, the material
yield of the steel plate can be improved. In order to reduce the width 19 of the hole of the
blanking 16 as much as possible in the progressive brazing method of the embodiment frame,
the steel plate 16 is provided with the slit 2o in the glue of the hole of the blanking 16 in FIG.
The width 18 and the pitch 17 of the steel plate 16 can be reduced with respect to the size of the
frame 10 to improve the material yield of the steel plate 16. In this way, by making the holes of
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the blanking 16 for shrinking process into a slip) 20, the slits 20 are expanded by drawing in the
material at the time of the drawing process, and the holes of the blanking 16 are served to serve
as steel plates. The drawing process can be performed without causing breakage. Here, 21 is a
bore size. FIG. 2 shows another embodiment of the present invention.
That is, in the case of deep drawing, by alternately making two slits 2 ░ as shown in FIG. 2, the
same effect as the hole of the large blanking 16 can be obtained, and deep drawing bm can be
performed. Become. According to the present invention, the area (product of width and pitch) of
the steel plate necessary for processing of the frame can be reduced, and the size of the material
can be reduced as compared with the conventional processing of the frame, which contributes to
cost reduction. .
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a drawing of a frame press according to an embodiment of the present invention, FIG. 2
is a drawing of a frame according to another embodiment of the present invention, and FIG. FIG.
4 is a structural cross-sectional view of a general speaker.
1 и и и и и и и и и и и и и и и и и и и и и и и и и steel plate, 20 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
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