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JPH0245000

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DESCRIPTION JPH0245000
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a diaphragm for a speaker used in various acoustic devices and a
molding apparatus used therefor. [0002] It has long been known to form a diaphragm for a
speaker from a thermoplastic synthetic resin 2 such as polypropylene or another elastomeric
resin. Generally, a vibrating body made of a thermoplastic synthetic resin is formed by separately
molding the cone portion of the vibrating body and the edge portion with a synthetic resin sheet
1-1 heat press, and pasting this with an adhesive or the like It was united together. On the other
hand, a method of integrally molding a cone portion and an edge portion by vacuum molding
using 4 synthetic resin sheets is also practiced in part. [Problems to be Solved by the Invention]
In the conventional diaphragm manufacturing method, the method of forming the con portion
and the edge portion separately by heat press includes forming by molding and demolding, and a
cone and an edge obtained. As well as requiring many processes such as laminating and
finishing, which are not only complicated processes, but also requiring management of the
adhesive, the cost of the product is inevitably high. On the other hand, the method of integrally
molding the cone part and the edge part by vacuum molding the synthetic resin sheet 1-1 is that
the thickness of the cone part and the thickness of the edge part are the same. It is difficult to
obtain compliance, and there have been many problems in practical use such as nonuniformity in
the thickness, such as thinning of a portion to be pulled strongly due to vacuum forming.
SUMMARY OF THE INVENTION In view of the current situation, the present invention aims to
develop a method and apparatus for integrally manufacturing a cone portion and an edge portion
by a very simple and easy method. [Means for Solving the Problems] In order to achieve the
above object, according to the first invention, a cone portion and an edge portion of a speaker
diaphragm are integrally molded by injection molding using a thermoplastic resin. . The second
invention is a more specific embodiment of the first invention, and in the case of integrally
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forming a cone portion and an edge portion by injection molding using a thermoplastic resin as a
raw material, either the cone portion or the edge portion is made in advance. After injection
molding of the above-mentioned members, injection molding of either the edge portion or the
cone portion is performed on the resulting molded body to obtain a diaphragm in which the cone
portion and the edge portion are integrated. The third invention is a molding apparatus for
carrying out the first and second inventions, wherein the fixed mold and the movable mold are
closed to make either the cone part or the edge part primary only. A primary forming mold
formed as a formed body, and an edge portion or a portion integrally formed with the cone
portion closing the fixed type and the movable type similarly are formed as a secondary formed
body. An injection molding apparatus configured with at least one pair with a next molding die,
wherein the primary molded body is supported on the movable mold used for the first molding
die and is commonly used for the second molding die. In the secondary mold formed by the
closure of the movable mold.
An end portion forms a cavity for holding a primary molded body which is in communication
with an end portion of a secondary molding cavity. According to the method of manufacturing a
speaker diaphragm of the present invention, basically, a cone portion and an edge portion are
integrally formed by injection molding using a thermoplastic synthetic resin as a raw material. In
a particularly preferred manufacturing method, one of either the cone portion or the edge
portion is formed in advance by injection molding using a thermoplastic resin as a raw material,
and a molded product obtained by this injection molding is made of the same or different
thermoplastic resin. As a raw material, either the edge portion or the cone portion is integrally
molded by injection molding. Specifically, the molding apparatus used in the method of the
present invention molds only one of the cone and the edge of the diaphragm by closing the
upper and lower molds, specifically, the fixed and movable molds. At least one pair of a primary
molding die and a secondary molding die for molding the remaining part of the two diaphragm
as a secondary molding, and one movable mold is moved to form the primary and secondary
molding The mold for secondary molding can be used commonly, and the mold for secondary
molding holds the molded body obtained by the primary molding and forms a holding cavity
which can be integrated with the molded secondary molding. . As a thermoplastic synthetic resin
material used for manufacturing the diaphragm of the present invention, an elastic body having
appropriate Young's modulus, tensile strength, elongation and the like under the conditions of
use of the diaphragm, and resin having resilience against external force Examples of preferable
thermoplastic synthetic resins include polypropylene, polyethylene, polyurethane resins, and 4methylpentene resin, which has recently been evaluated as a diaphragm material for speakers.
[Operation] In the first aspect of the invention, since the cone portion and the edge portion of the
speaker diaphragm are integrally formed by injection molding using a thermoplastic resin as a
raw material, opening of the cone and the edge portion as in a heat press The process of shaping
| molding and these bonding can be abbreviate | omitted. In particular, due to injection molding,
the degree of freedom in the speaker design is significantly improved. In the second aspect of the
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present invention, a thermoplastic resin is used as a raw material first for injection molding
either a cone portion or an edge portion to obtain a primary molded body, and-this portion is an
edge portion or a cone portion The same can be selected from the thickness of the cone portion
and the edge portion, since it is integrally added to the primary molded body simultaneously with
the injection molding using the thermoplastic resin of different materials or different materials.
Also, compatible different resins can be used.
The apparatus of the third invention comprises a primary molding die for molding only a cone
portion or an edge portion of a diaphragm by closing a fixed type and a movable type, and
holding a primary molded body obtained thereby And a secondary forming mold for forming the
remaining portion of the diaphragm, and the movable mold can be used commonly for primary
and secondary forming, so that secondary forming can be performed simultaneously with
secondary forming. The primary molded body can be integrated, and the steps of the heat press,
the bonding, and the like can be completely eliminated, and the production of the diaphragm can
be promoted by improving the molding zicle. This device can be formed by arbitrarily selecting
the thickness of the blow molded body and the secondary molded body. Moreover, the
diaphragm excellent in the acoustic effect can be obtained using the different raw material
compatible with the resin raw material. Embodiments of the present invention will be described
below with reference to the injection mold of the drawings. FIG. 1 is a longitudinal sectional view
at the time of mold opening showing an example of the injection molding apparatus of the
present invention, and the injection molding apparatus 1 comprises a fixed mold 2 positioned
below and a movable mold 11 positioned above. It consists of. Movable mold 11. The fixed mold
2 has a mold X for primary molding for cone partial molding on the left side about the axis A,
molding of an edge part on the right, and a cone part molded with the mold X for primary
molding A forming mold Y for integrated secondary forming is formed, and a fixed mold 2 of the
mold X is formed with a recess 3 for forming an inverted conical truncated cone portion, and
Curved convex portions on the periphery of the inverted truncated conical base portion 4. And a
shallow band-like convex portion 5 is formed, and a gate 6 communicating with the concave
portion 3 from the outside is provided. In the fixed mold 2 of the mold Y, a recess 7 for holding a
cone having an inverted truncated cone shape is formed at a position symmetrical to the mold
cavity formed in the mold X, and the inverted truncated cone of the recess 7 In the vicinity of the
base portion, a concave portion 9 for forming a shallow band-shaped edge portion and a convex
portion 8 for forming a curved edge are formed subsequently thereto. Further, a gate 10 and
gates 10a and 10b which are branched from the gate 10 and reach the outside of the recessed
portion for edge partial molding 8 are provided at the lower part of the fixed mold 2. On the
other hand, a mold X portion on the left side of the movable mold 11 and a concave portion 13
for forming an edge portion closely attached to the convex portions 5 and 4 of the fixed mold 2
by lowering the movable mold 2 It has a shallow band-like forming recess 14 for forming a
mounting portion for fixing to the outer peripheral edge of the frame, and a convex portion 12
for forming a cone portion is formed in the center surrounded by the recess 13 .
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Further, a mold cavity having the same convex portion 12, concave portion 13 and 7 concave
portion 14 is formed at the symmetrical position with respect to the axis A as a center of the
mold Y on the right side of the movable mold 11. With respect to the fixed mold 2, the movable
mold 11 can open the mold by raising and lowering by a raising and lowering mechanism (not
shown), can close the mold by lowering, and center the axis A with the movable mold 11 raised.
Can be rotated horizontally. As shown in FIG. 2, the mold X is closed by forming a cavity 15 for
forming a cone portion with the fixed mold 2 by lowering the movable mold 11, while the mold Y
is interposed between the fixed mold 2 and the fixed mold 2. And the cavity 16 for holding the
cone portion and the cavity 17 for forming the edge portion are closed. The cavity I6 and the
cavity 17 are configured such that their respective ends communicate with each other. The
molding apparatus 1 having the above structure is used as follows. First, the movable mold 11 is
lowered to close the molds X and Y, and the resin is injected into the cavity 15 of the mold X
through the game 1-6, and the cone 15 of the diaphragm (for convenience) double cavity 15 And
molding). Next, the movable mold 11 is raised, but the formed cone 15 is separated from the
fixed mold 2 of the mold X in a state of being supported by the convex portion 4 of the movable
mold 11, and the movable mold 11 is horizontally rotated 180 ░. The movable mold 11 is fitted
to the fixed mold 2 of the mold Y by lowering. At that time, the cone 15 is held in the cavity 16,
and its truncated cone-like base end is exposed at the lower end of the cavity 17 in
communication with the cavity 16. Next, the molten resin is injected into the cavity 17 through
the casings 1], 0.10a and], Ob to form an edge 17 (equivalent to the capacitance J7). The resin
injected into the mold also flows to the exposed portion of the cone 15 in the cavity 16 and is
welded to the end of the cone 15, thus the cone portion and the edge portion are integrated.
Thereafter, the movable mold 11 is raised to open the mold and the molded body is taken out
from the mold Y, whereby a diaphragm in which the cone 15 and the edge 17 are integrated can
be obtained. In this case, since the pair of left and right mold cavities 1 of the movable mold 11 is
essentially the same shape, it is possible to carry out the injection molding of the edge portion
with the mold Y by two rotations and simultaneously carry out the injection molding of the cone
part with the mold X It is also possible to improve the molding zicle by an injection molding
apparatus equipped with a plurality of molds X and Y, and to manufacture a large number of
diaphragms in a short time. The above-mentioned injection molding apparatus first forms a cone
portion and then forms and adds an edge portion thereto. As an injection molding device of the
present invention, an edge is first molded as shown in FIG. It is also possible to form a cone into a
single piece.
That is, the injection molding apparatus 51 is composed of a fixed mold 52 and a movable mold
58, and the fixed mold 52 has a recess 53. It has a protrusion 54.55 for forming an edge portion,
and has gates 56, 562 and 56b. Further, the portion of the mold Y of the fixed mold 52 has the
same dimensional shape as the fixed mold in the mold X except that the gate 57 is formed in the
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recess 54, but the four portions 53 are for cone portion molding It becomes a recess of One
movable mold 58 is provided with a convex portion 59 at the mold X portion, and a concave
portion 60 and a concave portion 61 for edge partial molding at the base peripheral edge, and a
convex portion 62 for cone partial molding at the mold Y portion. The recesses 63 and 64 for
holding the edge are formed in the base peripheral edge, and the mold cavity on one side has a
different shape. Then, the resin is injected into the cavity 65 of the mold X formed by the fixed
mold 52 and the movable mold 58, and an edge 65 (same symbol as the cavity 65) is formed
first. The movable mold 58 is rotated to fit the mold Y of the fixed mold 52 and closed, and the
molten resin is injected from the gate 57 into the cavity 66 and the cone 66 (same symbol as the
cavity 66) ) And at the same time integrally coupled with the pre-shaped edge 65. A diaphragm
can be obtained. According to the first aspect of the present invention, the cone portion and the
edge portion constituting the diaphragm are integrally formed by injection molding using a
thermoplastic synthetic resin as a raw material. It is possible to efficiently produce a reliable
diaphragm by completely excluding the method of manufacturing the diaphragm manually by
manual work, and to obtain a diaphragm as designed compared to the vacuum forming method.
is there. In the second invention, either a cone portion or an edge portion is formed by injection
molding using a thermoplastic synthetic resin as a raw material, and the molded product
obtained is similarly injection molded using an thermoplastic synthetic resin as a raw material by
the injection molding. In addition to the advantages of the first aspect of the invention, the twostage molding can provide an excellent diaphragm in which the cone portion and the edge
portion are integrated, in particular, the cone and the edge. It is excellent at the point which can
be selected freely and the kind of resin material can be selected. The third invention is a primary
molding mold for molding only a cone portion or an edge portion by closing upper and lower
molds consisting of a fixed type and a movable type, and a remaining edge portion or cone. An
injection molding apparatus comprising at least one pair of a secondary molding die for molding
a part as a secondary molding.
The movable mold can be used commonly for primary and secondary molding dies, and the
secondary molding die holds the molding obtained in the primary molding and can be integrated
into the molded secondary molding. Since it is possible to improve the molding zicle by injection
molding entirely by excluding the steps of the above-mentioned heat pressing and laminating etc.
entirely, the thickness of the molding of the blow molding and the secondary molding It is
possible to use a different kind of material compatible with the resin material, and it is possible
to easily obtain a diaphragm exhibiting an excellent acoustic effect by these materials.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a longitudinal sectional view of an open state of a mold showing an example of the
injection molding apparatus of the present invention, and FIG. 2 is a longitudinal sectional view
of the mold closed state of the apparatus of FIG.
FIG. 3 is a longitudinal cross-sectional view of a mold closed state showing another example of
the injection molding apparatus of the present invention. 1.51 иии Injection molding device 2.52 и и
и Fixed type 3.53 и и и Concave portion for forming a cone portion 4 и и и и и и и и и и и и и и 5 concave
portion 7 и и и concave portion for holding the cone 8 54 и и и и и и и и и и и и и и и и и и и и и и convex part
9.59 for partial molding of the edge и и и concave part for the partial molding of mold и IL 58
Recesses for partial formation of the edge 14.61 ииииииииии Portions for partial formation of the recess
и 15.66 и и и и Cavity for forming the cone 16 и и и и и и Cavity for holding the cone Edge holding
recess 64 иии Edge holding recess
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