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JP2001239559

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2001239559
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
injection mold for a foamed resin diaphragm for a speaker, and more particularly, breakage of a
molded article by a projecting pin when projecting a molded article or breakage of a sprue at
mold opening. The present invention relates to an injection molding die capable of continuous
molding by automatic removal without occurrence of
[0002]
[0002] A resin material such as polypropylene having high internal loss and excellent in
moldability, water resistance and moisture resistance is used as a material for a speaker
diaphragm, and it is molded into a diaphragm shape by an injection molding machine. Being used
for
[0003]
FIG. 2 shows an injection molding machine for manufacturing a loudspeaker diaphragm.
[0004]
In the figure, 11 is a molded product formed of molten resin, 12 is a sprue, 13 is a fixed side
insert, 14 is a movable side insert, 15 is a projecting pin, 16 is a product temperature control
circuit, and 17 is a sprue bushing.
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1
[0005]
When the diaphragm is manufactured by the above-mentioned injection molding machine, mold
closing of the movable side insert 14 and the fixed side insert 13 is performed by a mold
clamping mechanism (not shown), and the molten resin is injected from an injection device (not
shown). The molten resin is injected through the sprue 12 into the cavity forming the molded
article 11 and cooled to complete the molding.
[0006]
When the injection, filling, and cooling are completed, the mold is opened, the movable side
insert 14 is retracted, and the molded product 11 is protruded from the core by the protruding
pin 15 to complete the molding process.
[0007]
[Problems to be solved by the invention] However, since the foamed resin diaphragm for a
speaker molded with an injection molding mold has a thin surface thickness, when molded with
the above-described conventional injection molding mold, a molded article by the projecting pin
15 In the step 11 of projecting, since the diameter of the projecting pin 15 is small, the pressure
received by the projecting surface becomes large, and the projecting pin 15 breaks the molded
article 11 and breaks the molded article.
[0008]
In addition, since the resin amount of the sprue 12 is large, the drop rate of the resin
temperature is slow at the sprue 12 portion, and solidification is delayed with respect to the
molded article 11, and the sprue 12 adheres to the sprue bush 17 by internal pressure due to
foaming. At the time of opening, the sprue 12 is torn off from the molded article 11 and broken.
An object of the present invention is to prevent an occurrence of breakage of a molded article
due to the projecting pin 15 and breakage of a sprue at the time of mold opening, and to realize
an injection mold capable of continuous molding by automatic removal.
[0009]
SUMMARY OF THE INVENTION In view of the problems in the above-described injection molding
die for a foamed resin diaphragm for a speaker according to the present invention, the fixed side
nest and the movable side nest, the projecting sleeve, and the fixed side nest In an injection
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2
molding mold for a foamed resin diaphragm for a cone-shaped speaker provided with product
part temperature control means provided on the movable side nest, a center pin whose tip
projects in a spruce manner is inserted into the lower surface of the central part of the cone. This
is an injection mold of a foamed resin diaphragm for a speaker, which is provided with a sleeve
having a diameter and a low temperature control means around the periphery of the spur bush
and around the center pin.
[0010]
According to the present invention, in the step of projecting the molded article, the molded
article is projected by the large diameter projecting sleeve provided on the lower surface of the
central portion of the cone, so that occurrence of breakage of the molded article at the time of
projecting can be prevented. At the same time, the tip of the center pin is placed in the sprue so
that the amount of molten resin in the sprue can be reduced, so that the solidification speed of
the sprue can be increased, and low temperature temperature control means is provided around
the sprue bush and around the center pin. By setting the temperature around the sprue to a low
temperature, foaming of the sprue can be suppressed and adhesion to the sprue bush can be
suppressed, so breakage of the sprue at the time of mold opening can be prevented.
[0011]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the
present invention is a fixed side nest, a movable side nest, a projecting sleeve, and product part
temperature control means provided in the fixed side nest and the movable side nest. In the
injection molding mold for the foam resin diaphragm for a cone-like speaker provided, a large
diameter projecting sleeve is provided on the lower surface of the central portion of the cone,
into which a center pin having a tip projecting in a sprue is inserted. It is characterized in that
low temperature temperature control means is provided in the periphery, and in the step of
projecting the molded article, the molded article is projected by a large diameter projecting
sleeve provided on the lower surface of the central portion of the cone. The occurrence of
penetration of the molded product by the projecting pin can be prevented, and the tip of the
center pin is disposed in the sprue to reduce the amount of molten resin in the sprue. Increase
the solidification speed of the mold, eliminate the difference in solidification speed with the
molded product, further provide low-temperature temperature control means around the sprue
bush and around the center pin, and keep the sprue ambient temperature low to suppress
foaming of the sprue. Since the adhesion to the mold is suppressed, it has the effect of preventing
breakage of the sprue at the time of mold opening.
[0012]
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Hereinafter, an embodiment of the present invention will be described with reference to FIG.
(Embodiment) FIG. 1 shows an injection mold of the foamed resin diaphragm for a speaker
according to the present invention. In FIG. 1, 1 is a molded article, 2 is a sprue, 3 is a fixed side
nest, 4 is a movable side nest, 5 is a center pin, 6 is a protruding sleeve, 7 is a low temperature
control circuit, 8 is a sleeve, 9 is a product temperature control circuit, and 10 is a sprue bush.
In the present embodiment, the projecting sleeve 6 has an ejector sleeve structure with a wide
projecting surface, and is disposed on the lower surface of the central portion of the cone, the
center pin 5 is projectingly inserted into the hole of the sleeve 6, and its tip projects into the
sprue 2 It is provided as follows.
Furthermore, a low temperature control circuit 7 is provided around the sprue bush 10 and
around the center pin 5.
[0013]
Therefore, for example, if the 24 mm diameter projecting sleeve 6 is used instead of the
conventional 4 mm diameter projecting pins, the projecting pressure per unit area is reduced to
about 1/9 as compared with the conventional projecting pin. As a result, it is possible to prevent
the penetration of the molded article by the projecting means in the projecting step.
When the diameter of the sprue 2 is 8 mm, the amount of resin of the sprue 2 can be reduced by
1⁄4 at the protrusion by projecting the center pin 5 having a diameter of 4 mm into the sprue 2.
The solidification of resin 2 is accelerated by setting the low temperature temperature
adjustment circuit 7 of 100 ° C. around sprue 2 and center pin 5 separately from the product
temperature adjustment circuit 9 of 130 ° C. And since foaming of the sprue 2 can be
suppressed and adhesion of the sprue 2 to the sprue bush 10 can be prevented, molding can be
performed without breakage of the sprue 2 at the time of mold opening.
[0014]
In the above embodiment, the diameter of the protruding sleeve 6 is 24 mm, the diameter of the
sprue is 8 mm, the diameter of the center pin is 4 mm, and the temperature of the low
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temperature control circuit is 100 ° C. However, the present invention is not limited to these
numerical values, and may be changed as appropriate.
[0015]
According to the present invention, in the step of projecting the molded article, the molded
article is projected by the large diameter projecting sleeve provided on the lower surface of the
central portion of the cone, so that breakage of the molded article at the time of projecting is
caused. In addition to preventing the problem, the tip of the center pin is placed in the sprue to
reduce the amount of molten resin in the sprue, so that the solidification speed of the sprue can
be increased, and the temperature is low around the sprue bush and around the center pin. By
providing temperature control means and lowering the temperature around the sprue, foaming
of the sprue can be suppressed and adhesion to the sprue bush can be suppressed, so breakage
of the sprue at the time of mold opening can be prevented.
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