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JPS56141697

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DESCRIPTION JPS56141697
Description 1, title of the invention
Method of manufacturing speaker diaphragm
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a speaker diaphragm by subjecting a metal substrate formed by molding a metal
foil to surface hardening treatment including heating. A conventional method for manufacturing
this type of speaker diaphragm (the method described in Japanese Patent Application Laid-Open
Nos. 51-77220 and 52-102022 EndPage: 1 etc.) will be described based on FIG. In FIG. 1, 1 is a
metal substrate formed by forming a metal foil into a desired shape as a speaker diaphragm in
advance, 2 is a diffusing agent applied to the surface of the metal substrate 1, 3 is a furnace
formed of a heat resistant material, Reference numeral 4 denotes a lid for sealing the furnace 3,
and reference numeral 5 denotes a heating heater wound around the circumference of the
furnace 3. That is, first, the inside of the furnace 3 is evacuated to a vacuum atmosphere, and
then the heater 5 is energized to heat the inside of the furnace 3. When the inside of the furnace
3 is heated, the temperature of the metal base 1 and the diffusion agent 2 is increased, and the
diffusion layer 2 diffuses and penetrates the surface of the metal base 1 to form a hardened layer
(not shown). Ru. When a hardened layer is formed on the surface of the metal base 1, this metal
base 1 is rigid as a so-called sand-inch structure having as a core the remaining part of the
original metal base 1 where the hardened layer is not formed. It is possible to increase and
extend the upper limit of the reproduction frequency band. Since the strength of the metal
material generally decreases at high temperatures, the surface of the metal substrate 1 made of
metal foil, which is a metal material, is subjected to surface hardening treatment by diffusion
before the above-mentioned metal reaches a temperature at which diffusion and permeation
become active. There is a possibility that the base 1 may be deformed. Therefore, it has been
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necessary to prevent the deformation of a portion requiring particularly high dimensional
accuracy by using a suitable jig or the like. As described above, in the conventional method, the
metal substrate 1 which has been formed into a desired shape in advance is heated while
preventing deformation. Thus, such a two-dimensional metal foil is divided beforehand into a
three-dimensional shape. Molding to the material i: or there were various problems on the
economy. For example. As shown in FIG. 2, the cone-shaped diaphragm 6 provided with the
corrugation 6a and the lip 6b for characteristic improvement or the vibration of so-called
tangential edge 7a and fixing flange 7b as shown in FIG. 2. A dome-shaped diaphragm 7 provided
with a supporting system portion, and a cone-shaped vibration provided with a voice coil winding
povin 8a as shown in FIG. In the case of manufacturing 、 8 etc., it is necessary to perform an
annealing process in the middle to form the desired shape rc of the metal foil7, the forming
speed must be reduced, or it may be warm rather than cold working It needs to be processed or
hot-worked, etc., requiring many or special steps, requiring expensive metal foil as a material,
and having poor yield of metal foil as a material, etc. There was a problem with
The present invention has been made to solve the problems as described above, and in the step
of performing surface hardening treatment including heating, heat open molding is
simultaneously performed using the heating, and the surface hardening treatment is performed
before the surface hardening treatment. An object of the present invention is to provide a
speaker diaphragm in which the complexity of forming a metal foil can be reduced, the material
of the metal foil can be inexpensive, and the manufacturing cost can be reduced.
Method of manufacturing speaker diaphragm
The present invention will be described in detail with reference to FIGS. 5 to 7 below. FIG. 5 is a
side sectional view for explaining one embodiment of the speaker diaphragm according to the
present invention, in which 2 to 5 are the same as FIG. 1 respectively. 1 also shows a metal
substrate as in FIG. 1, but in the present invention, the metal substrate 10 is not formed into a
desired shape before the surface hardening treatment, and is formed into a shape close to the
desired shape. For example, in the case of manufacturing a cone-shaped diaphragm as shown in
FIG. 5, in the conventional method, the surface hardening treatment is carried out after forming
into a shape as shown in FIG. 4 from the beginning. The cylinder 1a is not completely cylindrical,
but is stopped to be formed into a nearly cylindrical shape which is depressed downward in the
figure. In this case, the die 9 and the punch 10 are povins when the punch 10 is fitted into the
bobbin la of the metal substrate 1 in this case. The shape is such that 1a is formed into a
cylindrical shape. That is, first, the inside of the furnace 3 is evacuated to a vacuum atmosphere,
and then the heater 5 is energized to heat the inside of the furnace 3. Here, the metal base 1 in
the furnace 3 is subjected to cold drawing on a metal foil (for example, a foil formed of titanium /
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titanium alloy, aluminum, aluminum alloy, magnesium or magnesium alloy, etc.) and then an
unnecessary portion It is desirable that the shape shown in FIG. 4 is removed by removing the
povin, but as shown in FIG. EndPage: 2 which is not common is common, and the strength of the
metal substrate 1 is relatively large at normal temperature, and it is held by the die 9 that the
punch 10 is shown on the metal substrate 1 as shown in FIG. It can float. When the temperature
of the metal substrate 1 rises in this state, the metal substrate 1 is softened and the elongation
rate also increases. Therefore, the punch 10 sinks into the bobbin la by its own weight, and the
bobbin 1a does not become thin. It can be shaped so as to be corrected into a cylindrical shape,
and is shaped into such a shape as shown in FIG. 4 by such hot forming. Thereafter, when the
temperature is further raised, atoms forming the hardened layer diffuse and penetrate from the
diffusing agent 2 to the surface of the metal substrate 1 to form a hardened layer (not shown). In
the above embodiment, the case of performing heat open molding using gravity (the weight of
the punch 10) has been described, but in addition to this, as shown in FIG. A punch 10 made of a
material having a large coefficient of thermal expansion is put in advance in a bottle 1a and
heated, and the difference between the thermal expansions is used, as shown in FIG. A heatresistant compression spring 11 may be disposed between 10 and the elastic force of the spring
11 may be used, and the same effect as the above-described embodiment can be obtained by
thermal open molding by these methods.
Further, in the above-described embodiment, the manufacture of the cone-shaped diaphragm
provided with the zabin 1a has been described, but the present invention is also applicable to a
dome-shaped diaphragm and a dome-shaped diaphragm provided with a bobbin, FIG. It goes
without saying that the present invention can be applied to the manufacture of speaker
diaphragms of various shapes such as a cone-shaped or dome-shaped diaphragm as shown in the
figure. Furthermore, in the above-mentioned embodiment, although the case where surface
hardening treatment of metal base 1 was performed by heating-diffusion was explained, in
addition, for example, if it is surface hardening treatment including heating such as chemical
vapor deposition, it is simultaneously hot formed Therefore, the present invention can be applied
and effects similar to those of the above-described embodiment can be obtained. As described
above, according to the present invention, in the step of performing surface hardening treatment
including heating, the metal base 1 is simultaneously subjected to heat open molding using the
heating to form a speaker diaphragm of a desired shape. At the same time, surface hardening is
performed, so that the complicated dust of forming the metal foil before surface hardening
treatment can be reduced, the material of the metal foil can be inexpensive, and the reduction of
the manufacturing cost can be measured. There is.
4. Brief description of the drawings. FIG. 1 is a side sectional view of the conventional method,
FIG. 2 to FIG. 4 are perspective views showing examples of the shape of the speaker diaphragm,
and FIG. FIG. 6 is a side sectional view for explaining one embodiment of a method of
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manufacturing a diaphragm, and FIGS. 6 and 7 are side sectional views for explaining another
embodiment of the method of the present invention. DESCRIPTION OF SYMBOLS 1 ... metal base,
1a ... bobbin, 2 ... spreading agent, 3 ... furnace, 4 ... lid, 5 ... heater, 9 ... gui, 1o ... punch, 11 ...
compression spring. In the drawings, the same reference numerals indicate the same or
corresponding parts. Agent Shino Nono-EndPage: 3 Fig. 4 Fig. 1 竿 7 EndPage: 4
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