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Description 1, title of the invention
Method of manufacturing hollow cylindrical aggregate
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a hollow cylindrical assembly, more specifically to a lightweight, high-strength
laminate, particularly a hollow hollow cylindrical body suitable for a core material such as a flat
speaker diaphragm. It is an attempt to provide a suitable method for producing As a core
material of a light weight and high strength laminate, an aluminum honeycomb is well known, for
example, it is used as a core material of a flat plate speaker in an acoustic relationship. However,
at present, when the honeycomb diameter is about 1 ff or less, its production is extremely
difficult and it can not be applied to a micro-vibration plate such as a sieve or a tweeter. The
present invention is capable of producing a lightweight, high strength laminated core having a
hollow diameter of about 1 inch or less. This method comprises the steps of applying a thin layer
of a composite of a thermoplastic resin or a thermosetting resin and an inorganic fine powder on
the surface of a solder alloy wire, with the applied alloy wire as the axis in the length direction,
Each is brought into contact, arranged, stacked, and formed into a block shape, the block is
heated or pressurized at a temperature below the melting point of the solder alloy, and the single
wires are thermally fused or thermally cured to be integrated And removing the solder alloy from
the structure by heating the integrated structure to a temperature above the melting point of the
solder alloy. EndPage: The first feature of the manufacturing method of the present invention is
that the hollow diameter of the assembly and the shape of the hollow cross section can be
arbitrarily set by selecting the wire diameter and the shape of the wire cross section of the solder
alloy wire. The second feature is that the selection of a composite material, that is, a composite
system of inorganic fine powder and resin, enables extremely high elastic modulus aggregates.
The third feature is the thickness of the composite layer of inorganic fine powder and resin
applied to the surface of the solder alloy wire. Therefore, the thickness of the hollow cylinder can
be easily controlled. The fourth feature is that the solder alloy used in the manufacturing process
can be recovered and reused. Next is the material that makes up the hollow cylindrical assembly.
With respect to the inorganic fine powder, it is preferable to use a material having a small
specific gravity and a large Young's modulus. Essentially, it is a material that becomes paint-like
by mixing with resin and solvent. Graphite is a typical example. Powders of carbon black, mica,
glass, calcium carbonate, carbon fibers and the like and mixtures thereof. Further, as resin for
bonding and solidifying inorganic fine powder and simultaneously bonding and integrating single
wires with each other, any of thermoplastic resin and thermosetting resin may be used, and as
thermoplastic resin, polyimide, polysulfone having a high softening point, Polyester and the like
can be used as the thermosetting resin, such as epoxy resin and phenol resin.
As the solder alloy wire used in the present invention, in the context of the heat resistance of the
resin, it is possible to use one having a low melting point near 60'C to one near 220'C. An
embodiment of the present invention will be described below with reference to the drawings. 20
parts by weight of an epoxy resin (including a 25.9 weight curing agent) is mixed in a toluene
solvent with 100 parts by weight of natural flake graphite powder sifted through a 42 mesh and
24 mesh sieve, and then the paint is applied. It was in the form of This paint was applied onto the
surface of a solder alloy wire having a melting point of about 160'C and a wire diameter of o and
a wire diameter of about 20 μm by the method of hetograph. next. The wire was heated in a so'c
hot air for 1.5 hours to put the resin in a semi-cured state. Next, this coated solder alloy wire has
a length of 20 clnl and a width of 4 t 7 I! In a state in which the coated solder alloy wires are in
contact with each other in the lengthwise direction of a wood piece having a thickness of 1 mm,
the film is wound up regularly to a width of about 4α in a width of about 4a. This was put into a
rubber bag and vacuumed and sealed, and then a pressure of about 1.5 tons and 1 ctA was
applied with a rubber press to make contacts between the lines dense and integrated. Next, the
resin was cured by heating in a hot air drier at 140 ° C. for 2 hours, and at the same time, the
lines were adhered to each other. Next, a block as shown in FIG. 1 was obtained by cutting at
right angles to the longitudinal direction of the line. In FIG. 1, 1 is a solder alloy wire and 2 is a
composite phase of graphite powder and resin. Next, the block shown in FIG. 1 is cut at an
interval of about 1 in the longitudinal direction, then a solder flux is applied to the cut surface,
and dipped for 1 second in 2300 C of solder melt. I pulled it up. By this operation, the solder
flowed out of the cylindrical structure, and a hollow cylindrical assembly as shown in FIG. 2 was
obtained. In FIG. 2, 3 is a graphite-resin composite. The hollow diameter of each assembly was
about 0.56 mW, and the wall thickness of each hollow body was about 17 μm. The hollow
bodies were in close contact with each other and firmly connected. In addition, as a result of
heat-pressing the thing of the same composition as the graphite-resin complex used here into
plate shape, specific gravity was about 1.9 f / cc, and Young's modulus was 7ooky /-. From this
result, it is expected that the cylindrical assembly produced here is extremely high in strength. In
addition, as shown in FIG. 3, by applying a face material having a large Young's modulus on both
sides of the assembly as shown in FIG. 3, a laminate having an extremely large flexural rigidity
can be obtained. Furthermore, 5 in FIG. 3 is a core of the hollow assembly, and 5 and 6 are face
In the above method, the inorganic fine powder-resin composite functions to bond the hollow
cylindrical bodies, but as a method to strengthen the bonding function, the inorganic fine
powder-resin composite layer is preliminarily formed on the surface of the solder alloy wire. A
method of forming and heat curing, providing an adhesive layer of resin only, and arranging and
laminating it can be applied. As apparent from the above, the manufacturing method of the
present invention is a novel one which can manufacture a fine core material EndPage: 2 by an
extremely simple process. In addition, a core material manufactured by such a method can be
combined with a suitable face material to obtain a lightweight, high-strength laminate, and it can
be expected to be applied to various fields.
4. Brief description of the drawings FIG. 1 shows an embodiment of the method for producing a
hollow cylindrical assembly according to the present invention, in which coated solder alloy
wires are arranged and stacked, and single wires are fused by pressure heating operation. FIG. 2
is a view showing an integrated state, FIG. 2 is a view showing a state in which a solder alloy wire
is similarly melted and flows out from the structure by heating, and a hollow cylindrical
aggregate is completed, FIG. It is a figure which shows the structure of the laminated body which
is application of the hollow assembly manufactured according to one Example. 1 · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · hollow cylindrical core, 6, 6 · ·
· · · · Face film. Name of agent Attorney Nakao Toshio and others 1 person @ 1 figure 1 figure 2
figure 3 EndPage: 3
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