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1. A method of forming a metal cone for a speaker and an apparatus therefor
2, the scope of claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of
forming a metal cone for a speaker and an apparatus therefor. Currently, paper cones or paper
composite cones made of carbon fiber etc. are generally used as speaker cones, but a good
speaker can be realized with a cone made of metal and buffer material combined or a cone of
metal veneers. It can be manufactured. Production of a metal cone with a shape like a speaker
cone Generally, drawing processing using an L-press mold uses spinning processing, etc., but first
providing processing methods by hydraulic forming method and normal temperature gas
pressure forming method, The various merits to the conventional processing method were
clarified. However, since these processing methods are all based on the normal temperatureadded EndPage: 1 method, the amount of springback of molded products is large, and many mold
corrections need to be repeated in order to form into a prescribed shape. Man-hours and a period
are required. This correction is a major problem for short-duration or urgently required parts.
With regard to these problems, it has been desired to develop a molding method and a device
having a small amount of springback, satisfying the necessary strength as a speaker cone. The
object of the present invention is to form a metal cone for a speaker, which has a smaller amount
of springback of a molded article than the cold liquid pressure molding method and the normal
temperature gas pressure molding method previously provided, and satisfies the strength of the
speaker metal cone. It provides a method and apparatus for forming and processing at a
temperature near the recrystallization temperature (150 to 250 ░ C.) of a processed plate. In
order to achieve the above object, the molding chamber 18 of the molding chamber 18 is formed
so that a desired molding shape can be obtained on the inner surface of the overhang die 5 using
only the female die of the conventional press die drawing device. A mold of a structure in which
the mold heating body 17 is embedded in the peripheral overhanging mold 5 and the air vent
hole 10 and the spacer 9 are provided in the center of this mold, and the center of the
overhanging overhang 8 facing the overhanging mold 5 There is provided a tubular piping
portion 13 penetrating in the thickness direction of the mold, and a preloading chamber 15 is
provided so that pressure is uniformly applied to the overhanging die 5 and the molding
chamber 18. Using the mold of the structure in which the mold heating body 17 is embedded in
the base 6 and the mold of the structure in which the backing groove is inserted in the periphery
of the pattern to maintain airtightness, Mount a metallic thin plate between the above Pressure is
applied to the overhanging mold 5 and the overhanging table 6 by applying pressure to the ram
1 of a press to make them adhere closely, and then the piping section 13 selects either high
temperature gas or high temperature liquid around the recrystallization temperature of the work
plate The metallic thin plate is formed and processed in the forming chamber 16 by pressure
feeding from the outside.
According to the heating method of the present invention, a desired temperature can be obtained
even if the mold is placed in the constant temperature heater 16. The term "recrystallization
temperature" as used herein refers to a temperature at which recrystallization, in which
generation and growth of new crystal nuclei are observed when the processed metal is heated to
a certain temperature or higher, is about one hour of heating time. The temperature is around
200 ░ C. to target At and At alloys. Hereinafter, the present invention will be described in detail
by way of examples. FIG. 1 is a view showing an embodiment of a molding apparatus for a
speaker metal cone according to the present invention, in which a molding apparatus is mounted
in a constant temperature heating apparatus 16. In the figure, 1 is a press ram having a
cylindrical shape in the center, 6 is an upper guise set of the press, and guide holes are provided
at four corners. Four pillars 2 fixed to the lower die set 8 through the guide holes are
incorporated. The upper side guise set 3 and the lower side die 7 are always kept at a
predetermined interval by four springs 4 having the column 2 as a core. Further, the overhang
die 5 is attached to the upper die set crucible, and the overhang base 6 is attached to the lower
die set 8, and a predetermined air gap is generated between the overhang die 5 and the overhang
8 wedge. A recessed molding chamber 1B is processed in the overhang mold 5 so as to obtain a
speaker metal cone having an outer diameter of 160 fr fn 1 and a thickness of 80 ? after
molding, and the center of the mold is a spacer 9 and a vertex of the overhang mold 5 There is a
gap of about 1 m between them, and the negative pressure at the time of molding is discharged
from the gap. A heating element 17 such as a nichrome wire is inserted around the forming
chamber 18 so that the work plate (aluminum plate) 11 is uniformly heated to 250 ░ C. The
overhang 8 has a circular shallow (approximately 2111111 or more depth) concave precompression chamber 15 having an outer diameter 160 dark of the speaker metal cone formed
on the surface in contact with the overhang die 5. A heating element 17 such as a nichrome wire
is embedded in the overhanging base 6 at the bottom of the preloading chamber 15 so that the
plate 11 can be uniformly heated. Furthermore, a backing 7 is provided outside the
precompression chamber 15 so that the airtightness of the formed portion can be maintained
with a press pressure of 6 tons. Next, in the central portion of the overhanging platform 6, a
tubular piping portion 13 is provided which penetrates in the thickness direction of the mold and
leads to the forming portion from the outside through all the lower die set 8 and the pressing
platform 12. EndPage: 2 is configured to pump gas at 250 ░ C. In order to form the metal cone
for a speaker, 1 the processed surface of the overhang mold 5 is completely removed from the
fiber debris and other refuse by using a silk cloth, nylon cloth, compressed air or the like.
Next, an aluminum thin plate 11 of 200 mm thick is inserted into the gap between the overhang
die 5 and the overhang pedestal 6. Next, a pressure of 3 tons is applied to the ram 1 of the press
to bring the overhang mold 5 and the overhang table 6 into close contact. Next, nitrogen gas is
pumped from the piping section 13 at a temperature of 250 ░ C. at a speed of 1 KJ ycd и set or
more from the outside. The gas is not particularly limited to nitrogen gas, and may be an inert
gas such as compressed air or high pressure argon gas. When the gas pressure 't10 to 13 to ?d
of the forming chamber 16 is increased and held for one second or more, the aluminum thin
plate 11 exhibits plastic deformation and finally becomes the same shape as the inner surface of
the overhang mold 5 1 Since the air vent hole 10 is provided at 9, the pressure in the molding
chamber 16 is adjusted to a pressure optimum for molding. Then, the speed 1 Kq Ar I! Contrary
to the time when the gas in the forming chamber 16 is pumped. Remove the load applied to the
ram 1 of the press after removing at -36 C or more. Then, since the extension die 5 is moved
upward by the spring 4, the thin aluminum plate 11 is removed from the forming chamber 16.
The aluminum squeeze formed in this way and the cone for a beaker have a surface with a
beautiful appearance with a high commercial value and no scratched or scratched surface, and
from a normal temperature hydraulic pressure or gas pressure molded one The same shape as
that of the matrix with a small amount of springback was formed. The inert gas was used as the
gas at the time of molding, but the degree of safety of the work is extremely high. Next, another
embodiment of the present invention is shown. As a molding apparatus for a speaker metal cone,
the one used in the above embodiment is used. The only difference is that the inert gas is
pressure-fed from the piping section 16 into the molding chamber 16, but in the present
embodiment the silicone oil is silently inserted by the hydraulic pump. The process of operating
the press die for forming a metal cone is completely the same as in the above embodiment, but
since a silicone oil is used, a fine particle mixture in oil is used by tearing it with a filter or the
like. Furthermore, after the product is removed from the silicone oil in the post-forming cleaning
process, the surface is beautifully finished. In this way, the aluminum speaker cone formed in this
way was subjected to battering and scratching--the comparison of the springback amounts of
cold-formed and hot-formed Okawa cone at 250 ░ C. In the case of h at 250 ░ C hot-formed is a
cold-formed one, but about 1/6 of the amount of 7 ringback, so that the shape of the matrix can
be faithfully formed and each point like b characteristics. Because it is springback uniformly,
correction of the mold is easy.
Therefore, while it is an effective method at the trial production stage such as shape
determination experiment, it is also added value as mass production processing method, ? is
high temperature tensile strength, b is high temperature tensile strength (0, 2%) and C is The
amount of high temperature tensile was shown. Since the molding processable total amount of
the speaker metal cone is 10% or more and it is the overhang method, the lower limit of the
temperature range of the heat open molding is 150 ░ C. according to FIG. In addition, the lower
limit temperature at which stable molding can be carried out stably is 180 ░ C., with all
consideration given to feathering of feathers. Indicates the proof stress of the processed material.
The total elongation of this is 23 inches and molding is impossible. ?g? is a proof stress of a
size 12 material fired at 250 ░ C., and the total elongation ? is 8%, and forming is impossible
rim. h is the proof stress of a 300% annealed material, and the full elongation view is 1,8%, which
indicates that cold forming is possible 4. C) ') proof stress during hot tension at 250 ░ C., and
the total elongation ? is 345 ?, which is very good in formability, but the proof stress is the
lowest. k is the result of adding the pre-strain shown in the horizontal axis of FIG. 4 at 250 ░ C.
to the sample and then performing tensile test and straining at room temperature to show the
actual rigidity of the hot-formed product . Accordingly, the molded product of the speaker cone
has a proof stress of about i4 kg / y5 from the point deflection characteristic of k of 15% on the
horizontal axis (pre-depression) in FIG. On the other hand, as described above, the cold-formed
molded EndPage: 3 work is a sheet metal layer of the condition of h characteristics. Since the
plastic working is performed, the yield strength is improved more than the h property, but the
rigidity of the hot-worked product is higher or equal. From FIGS. 2, 3 and 4, this hot forming
method can also expand the envelope. As mentioned above, although the hydraulic forming
method and normal temperature plate which were already provided to the shaping | molding
process of the metal cone for speakers were used, it is applied also to other thin plates (for
example, titanium, <-malloy, others). (2) The amount of spring back is smaller in the hot-formed
one than in the cold-formed formation, and the one having the same shape as the mother die is
formed. ? The amount of springback is small and it is uniform, so it is easy to modify the mold
to make it into a specified shape. ? It is most suitable for the development of short prototypes
and those that require sudden changes. (2) The rigidity of the molded product is equal to or
superior to that of the cold-formed product in the range of processability of this speaker cone. ?
It can be applied as a mass production molding method. ? The pressurized medium may be
liquid or gas, but gas has a wider range of use.
4. Brief Description of the Drawings FIG. 1 is a view showing mechanical properties of a metal
coker cone for a speaker according to the present invention which is formed at room
temperature gas pressure, 250 ░ C. thermal property and a hot gas pressure molded product. 5
...... overhanging type, 6 ...... overhanging table, 7 ...... backing, 8 ...... lower die set, 9 ...... spacers,
10 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Gas
outlet or oil outlet, 15 ...... preload chamber, 16 ...... constant temperature heating device, 17 ......
type heater old 1 Figure EndPage: 4 years 3 (?TsuRyomi) Appendix I; 1 " List of documents (1)
Description b 1 (2) M-face 1 (3) k Single-person (4) ? 1 patent application duplicate 1 other
inventor, patent applicant or representative inventor Name 1 MN No. j Address Same name
Seyama Nagashi Hakkosho name Same name 1) Pre-weight address Same name Kobayashi
Masaru procedure corrections book (spontaneous) January Showa 5 Showcase of the Patent
Office Secretary's case January 2013 Attorney who a year Patent Application No. 101226 No.
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