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Description 1, title of the invention
Carbon sliding plate
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carbon
diaphragm mainly used for acoustic equipment. = A diaphragm for audio equipment in general,
especially a thin plate used as a diaphragm of a speaker, is light in weight and has a large rigidity
t <, and a high rigidity in order to reproduce efficiently in summer in a wide frequency band with
high efficiency. The ratio of ratio 8 to density P, that is, the specific stiffness B / p is required to
be large. From these points, wood merps, almonium, titanium, etc. were conventionally used and
examined. Can not be said to have sufficient characteristics. That is, horn, beryllium, carbon and
the like are large materials of E / f), but these materials have poor processability, and titanium
and aluminum have relatively good processability of materials. Good, but relatively stiff in its
physical properties I! There is a defect that l / P does not increase at 0 °, but when a composite
resin material is used, there is a composite material with general + cJ fiber, but the lubricity of
the surface of carbon fiber itself is In the case of EndPage: 1, bonding of synthetic resin is not
sufficient, and it is difficult to obtain great rigidity as a diaphragm. The present invention is made
in view of the above point, and its object is In the place, a composite material of scaly graphite
and a synthetic resin carbide is used to be fired to a predetermined shape, and the fine powder of
the metal oxide mixed with the scaly graphite is heated and melted to be reduced. It is
characterized by combining graphite graphite and synthetic resin carbides, thereby making it
lightweight, highly rigid, and relatively fragile, mechanical strength as well as Okura <, excellent
in workability, inexpensive, and inexpensive. Below is a detailed description of the present
invention. Will be described in the order of steps. First, in the first step, a scaly graphite is mixed
with a synthetic resin material. Next, in the second step, a fine powder of metal oxide as a binder
is mixed with the mixture of the scaly graphite and the synthetic resin material. In the third step,
the scaly graphite is oriented by forming the raw material obtained through each of the above
steps into a sheet through a large number of rolls. Thereafter, in the fourth step, the shape of the
diaphragm, for example, a speaker diaphragm, is formed into a shape such as a cone or dome by
vacuum forming method or the like. This is set in a mold in a vacuum furnace as the S step S, and
the building resin is carbonized into carbides thereof by gradually raising the heating
temperature. In this case, if the mold is heated to about 31 ° C., the strength of the molded
product is increased and the subsequent handling is good. As the sixth step, the heating
temperature in the vacuum furnace is further raised to heat and melt the fine powder of the
metal oxide to react with the flake graphite and the carbide of the synthetic resin to reduce the
metal oxide and also to form the flakes. Oxidised graphite as well as carbides of synthetic resins.
The oxidized scaly graphite and the carbides of the synthetic resin are activated to strengthen the
bond with the metal, and after being grown, it is cooled as the first step, and the carbides of the
scaly graphite and the synthetic resin are cooled. A carbon diaphragm made of a composite
material is obtained. When the present invention is carried out, it does not matter whether the
synthetic resin material is a thermoplastic synthetic resin or a thermosetting synthetic resin, but
it is important that the synthetic resin can be made into a sheet and can be carbonized. For
example, synthetic resins such as polyvinyl chloride, polyester and phenol having a high carbon
yield are most suitable. In addition, fine powders of metal oxides referred to here are preferably
light metal oxides such as aluminum oxide, magnesium oxide, peroxidic oxide etc. of 2 to 3 μ 0.
As a specific example, for example, flake graphite When the present invention is carried out with
a weight ratio of 200: vinyl chloride 100: aluminum oxide 2, the carbonization temperature of
polyvinyl chloride in the vacuum furnace in the fifth step is about 500 ° C., and the sixth step
The reduction temperature of aluminum oxide in the vacuum furnace is around SSO ° C. And
scaly graphite and synthetic resin carbides such as polyvinyl chloride and aluminum oxide are
thought to react with the formula of 3C + 2 AI, O, → 3 CO, + 4 AI: 0EndPage: 2 The carbon
diaphragm obtained by the present invention is a metal oxide The fine powder of the product is
heated, melted and scaly graphite and synthetic tI4! The density and Young's modulus are
improved as compared with the conventional product because it is a binder with carbides. That
is, the relative stiffness is larger than that of a conventional diaphragm formed using a material
such as aluminum or a diaphragm formed by simply firing a composite agent such as scaly
graphite and carbon fiber. In addition, conventional diaphragms formed using a metal material
such as aluminum or the like that is larger in rigidity and mechanical strength than a
conventional product using a synthetic resin material or using carbon such as graphite. It is
lightweight compared with the above, and moreover it has excellent workability and cost
compared to conventional products using pawn, beryllium and carbon. EndPage: 3
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