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JPH02172399

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DESCRIPTION JPH02172399
[0001]
The present invention relates to a method and apparatus for die-cutting of speaker cone paper.
As shown in FIG. 3 of the "Prior Art", a speaker cone 1 is a conical cylinder having a cone portion
2 with a gentle slope. For production of the speaker cone 1, for example, natural paper raw
materials such as wood valve, hemp pulp, kapok valve etc. are dispersed in water, paper is made
without beating or beating it, and it is dried and made into corn base paper. In order to impart
moldability to the corn base paper, a thermosetting resin such as a phenol resin is impregnated,
and then this is molded into an inverted truncated cone in which the above-mentioned conical
cylinder is inverted to form a bottomed one. Then, it is injected between a male mold and a
female mold and molded under pressure and heat to obtain a molded body 4 having a peripheral
support 3 as shown in FIG. And the bottom portion 5 are punched out to obtain the speaker cone
1 for a speaker. The above-mentioned molded body 4 may be produced by heating the abovementioned mold and sandwiching the plus deck sheet. The above-described die-cutting procedure
is shown in FIGS. That is, ?7? waiting period due to the separation between the mold 6 and the
lower mold 7 (a). The injection of the molded body 4 into the mold 6.7 (FIG. B). The inner
removal mold 6a is lowered in a mode in which the inner removal mold 6a is advanced from the
outer removal mold 6b, and positioning of the formed body 4 by pressing the bottom portion 5
of the formed body 4 of the inner removal mold 6a (C). Close adherence to the surface of the die
due to the catch-up of the subsequent outer drawing die 6b (Fig. D). Outer removing die 7b, inner
removing die 7 + 1. Die-cut can I и (Fig. 0) in which the amount of lowering is larger in the inner
removal mold 6a. Die removal due to die separation (f figure). In the northward process, the
molded body 4 is stiffened around the corn paper 12. The bottom 5 is cut (Figure g). [Problems
to be Solved by the Invention] In the conventional die-cutting on a weir, in the case where the
slope of the cone part 2 is loose and close to a flat shape, and the disc-like drop is small, When
the bottom 5 of the 6a is pressed, the guide function to the normal position by the cone does not
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work enough, accurate positioning is extremely difficult, die cutting defects easily occur, yield
loss, operation speed There was a decline and a drop in efficiency. An object of the present
invention is to provide a method and an apparatus for die-cut for speaker cone paper that can be
positioned quickly and accurately even when the slope of the cone portion 2 is loose and close to
a planar shape. [Means for Solving the Problems] In order to achieve the above object, according
to the method of the present invention, when molding a molded body, a steep reverse circle III or
a truncated cone or concave portion is formed in advance at the bottom. B) In the upper and
lower molds, the upper and lower molds are punched by forming the upper and lower molds on
the sandwiching surface of the inner and outer extraction molds in accordance with the uneven
portions. is there.
Further, the device according to the present invention is a steeply inclined inverted truncated
cone or a truncated cone provided on the bottom of the molded body on the sandwiching surface
of the upper and lower molds and the inner extraction mold and the inner extraction mold. The
uneven shape is provided corresponding to the uneven portion in the shape of a circle. It is
preferable to attach a spring backup to the inner removal mold. According to the means of the
present invention configured as described above, the upper mold and the lower mold sandwich
the reverse of the steep slope or the truncated cone-like unevenness first applied to the bottom
of the molded body. Therefore, the guy 1-function to the normal position works and the diecutting defect does not occur. Also, the above operation works more smoothly if there is a spring
back-up in the inner removal mold, since the guiding action works while gradually changing
gradually and then gradually. The embodiment of the present invention will be described with
reference to the drawings. In FIG. 1, the molded body 8 in the present invention has a bottom
portion 9 in which a truncated cone shaped convex portion 10 is formed. It is shaped. Therefore,
as a matter of course, as shown in FIG. 2, the upper mold 11 for cutting out the molded body 8
described above. Correspondences to the convex portions 10 are applied to the sandwiching
surfaces of the inner and outer pull-out molds 11a and 12a in the lower mold 12 so as to have
concave and convex shape 1.3.14. The die-cutting procedure according to this will be described
with reference to FIG. The drawing shows the case where the backup of the spring 15 is attached
to the inner removal mold 11 a of the upper mold 11. A waiting period due to the separation
between the upper mold 11 and the lower mold 12 (a). Injection of the molded body 8 between
the molds 1.1.12 (Fig. B). The inner removal mold 11 a is lowered in a manner preceding to the
outer removal mold, and the round shape 13 of the mold 11 a is covered with the convex portion
10 of the bottom 9 of the molded body 8. Under the present circumstances, since the convex part
10 is a frustum and a truncated cone of inclination, (f, the shaping | molding body 8 is
determined to a correct position in a guide ability. When the mold 11a has a backup of the spring
15, the above-mentioned guiding action is gradually strengthened, so that an ideal guiding can be
reasonably expected (C diagram). Close contact with the surface of the die due to catch-up of the
subsequent outer removal die 11b (Fig. D). Die removal box h (e figure). Die removal completed
by die separation (f figure). The molded body 8 is obtained by the two steps, and around the corn
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paper 161 c. January 7. The bottom part 9 having the convex part 10 is cut and divided (Fig. G).
[Effect of the Invention] Since the present invention is configured as described above, the
following effects can be obtained. As a result of attaching an acute-angled guide part to the
bottom of the molded body with a flannel-like shape which has not been provided with any
conventional guy F part, high accuracy can be expected and mass production efficiency is
remarkably improved with a small configuration. It became.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view of a molded body according to the present invention, FIG. 2 a-g are
process step diagrams of the method of the present invention according to the present invention
device, FIG. 3 is a perspective view of cone paper for speakers, FIG. Fig. 5 is a perspective view of
a conventional molded body, and Figs.
3 и и и peripheral Paris, 4 и и и molded body, 5 и и и bottom portion, 6 и и и upper mold, 6 a и и и и inner
removal mold, 6 b и и и outer removal mold и и Lower mold, 7a и и и inner removal mold, 7b и и и outer
removal mold, 8 и molded body, 9 и и и bottom portion, 10 и и и и и и и и и Upper mold, 1.1a: internal
removal mold, 12: lower mold, 12a: internal removal mold, 13: rotational shape, 14: convex
shape, 15 ? ? ? Spring, 16 ? ? Corn paper, 17 ? ? ? Hear around. 1 иии Corn paper for
speakers, 2 иии Cone section, bush t thug f 4 A ? C 1
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