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The present invention relates to a deformed magnet having radial magnetic anisotropy utilizing
processability gold of an Fe--Cr--Co based magnet alloy and a method of manufacturing the same.
In an electric voice conversion device such as a speaker or a tt-talk receiver, it is necessary to
form a magnetic circuit surrounding a conductive movable medium such as a zeis coil and a
permeable magnetic medium. This magnetic circuit is generally formed by being joined to a busy
@ 4 magnetic conductor (Yoke 1, t5-, etc.) in which a cylindrical permanent magnet is formed in
a magnetic circuit shape by a contact layer or the like. However, soft-types generally used as
yokes etc. are not necessarily good magnetic conductors (and adhesive material scraps have the
same effect on space as eight spaces, and the permanent magnet 旺 11 i 5 is reduced There are
many. For this reason, if it is not possible to construct as many as possible (a part of the magnetic
circuit is made of a permanent foundation stone itself having a magnetic anisotropy which is
nearly equal to the circuit direction), a magnetic circuit is created that is The performance of the
f 性能 converter can be improved. The present invention, as a part of the above-mentioned plan,
is a variant magnet having at least (a part of which is a processed plate having a radial □□□ air
anisotropic condition at least a part of which coincides with the extending direction) and an
efficient manufacturing method thereof. Intended to be provided. In the past, it has not been
attempted at all to manufacture the deformed magnet as described above. For example, there is a
method of applying a radial magnetic field when compacting and sintering ferrite magnet powder
to form a variant magnet as an example. However, the deformed magnet obtained by this method
can not obtain the characteristics which are twisted only with respect to the radial magnetic
anisotropy alone, and the practicability to the electric sound 4111f as described above is poor.
As another method, it is conceivable to cut out from the block-shaped magnet only for the entire
shape, but with this, radial magnetic anisotropy along the plate shape full opening can not be
obtained. According to the study of the present inventors, it was found out that utilizing the
excellent processability of the Fe-Cr-Co based magnet alloy is extremely effective for coupling of
the above-mentioned purpose. It is known that high-performance magnets with unidirectional
anisotropy can be obtained by performing bathing treatment on 1 · F · Cr-Co based magnet alloy
and performing aging treatment in history (Tat と is 7-10166). The present inventors further
advance from such a prior art that the F'5-Cr-Co based alloy has a phase change plastic-rorophilic
gold having a phase of 1111 / l in pure iron before the aging treatment. I tried to use it
positively. Just from the Fs-Cr-Co alloy, form a straight pipe bl using its processability, and tap
the hot water in the extension direction t!
J1 was performed, and at one end r, the deformation processing of strength with diameter
expansion or diameter reduction was performed, and then aging treatment was performed. As a
result, the one-way magnetic anisotropy f + given to the first section by state raising processing
changes to radial magnetic anisotropy according to the direction of material '0) deformation by
deformation processing with diameter expansion or diameter reduction 1r, When the crucible
was subjected to an aging treatment, it was possible to obtain further improvement of the
magnetic additivity while maintaining such radial magnetic anisotropy. □ · The deformed magnet
of the present invention is based on the above-mentioned findings, and more specifically, is a
processed Fe-Cr-Co alloy, at least a portion of which extends radially from the central ridge
outward. It is characterized in that it is a plate and has radial magnetic anisotropy almost parallel
to the extension direction of the processed peak body. Further, in the method of producing a
modified magnet according to the present invention, heat treatment is applied to a straight pipe
material made of an Fe-Cr-Co alloy while applying a magnetic field in the extension direction, and
then at least one end of the straight pipe material is It is characterized in that diameter expansion
or diameter reduction processing is performed so as to form a rolled plate body extending in the
orthogonal direction, and then an aging treatment is performed. Hereinafter, this invention will
be described in history. In the following description, “嗟”, which represents the composition, is
taken as the m standard unless it is sometimes noted. The composition itself of the Fe-Cr-Co
based magnet alloy used in the present invention is known. For example, Cr 2 to 30%, Co 5 to
37%, the balance substantially consisting of Fe, and, if necessary, one or two kinds of microsewing elements such as Ti, Zr% Ni, V, 81, etc. What contained 0.1 to 8% of the above in total is
used. Examples of odd-shaped magnets of the present invention formed using these five FrCr-Co
based magnet alloys are as shown in FIGS. 1 to 4. Here, FIG. 1 (,) to FIG. 4 (a) are front sectional
views including the central axes of the respective magnets, and FIG. 1 (b) to FIG. 4 (b) are FIG. 1)
is a side view of FIG. 4 (a) with a gloss from the left direction. In any of the examples, as
described above, the deformed magnet forms the processing disk 2 at least a part of which
radially extends outward from the central space 1 and is substantially parallel to the extending
direction of the processing disk 2 Radial magnetic anisotropy (indicated by an arrow with M in
the figure). As is apparent from FIGS. 1 to 4, the deformed magnet of the present invention leaves
the tubular portion 3 or f! <FIG. 1 to FIG. 3), or the whole of which has a substantially disc shape
(FIG. 4) may be used. Further, the end of the tubular portion 3 of the deformed magnet shown in
FIGS. 1 to 3 can be further formed into a radial disc shape similar to the pressure side end shown
in FIGS. 1 (a) to 3 (a). (Not shown).
Also, the valley disc does not necessarily have to be a flat plate as shown in FIG. 1 and FIG. 2
under the condition that it extends ftj outward from the central space, as shown in FIG. It can also
be a curved plate. Furthermore, the disc 2 can be expanded outward from the pipe portion 3
(FIGS. 1 and 3) or can be formed to extend inward (FIG. 2). As can be further understood from
FIG. 1 to FIG. 3, the deformed magnet according to the present invention merely has a disc
portion 2t-having radiation magnetic anisotropy (including the curved surface and the surface
thereof. It has perfect magnetic anisotropy. Such a feature is particularly advantageous for the
release of magnetic circuits such as in the electroacoustic transducers described above. In
addition, the shape of the processed plate of the deformed magnet of the present invention is
usually a disc as described above, but an elliptical plate or other shapes are also possible. A
detailed description of the invention will now be described of manufacturing a variant magnet as
described above. According to the present invention, first, a straight pipe made of an Fe-Cr-Co
alloy is formed. This straight pipe is formed by drawing or extruding using the plastic formability
of an Fe-Cr-Co alloy, or-forming a flat plate and bending this flat plate to form a tube For both
ends, the method of bath contact is used by TIG welding. Increasing the processing rate at this
stage is also effective in improving the magnetic properties of the product magnet. In this
respect, high processing rates can be obtained by processing a flat plate with a rolling roll.
However, Fe-Cr-Co alloys are excellent in plastic formability, so it is possible to increase the
working ratio to the extent used in the present invention by drawing or extrusion, and it is used
as a substitute for flat plate processing. It can also be done. A general step in the method by flat
plate processing is, for example, melt casting → hot forging → annealing → cold rolling → bath
formation, whereby a flat plate with a thickness of 0.2 to 51111 is obtained. Be The conditions of
each process are known for Fe-Cr-Co based alloys, and there is a certain degree of optionality in
the order of carrying out the processes, so more detailed information is omitted. Next, heat
treatment is performed to the obtained straight pipe while applying M field along the central axis
direction. The heat treatment conditions also differ depending on the composition of the Fe-Cr =
Co alloy, but when it is mentioned to -151 J ', after heat treatment at 670 to 720 ° C. for about
1 hour, it is between 1 (1 to A) ° C./- It cools to 600-620 degreeC with a cooling rate, and aircools after that. The strength of the magnetic field is generally about 16.000 to 400,000 A / m.
Such magnetic field treatment slightly lowers the inertia processability of the Fe-Cr-Co alloy, but
does not prevent the subsequent deformation processing. With respect to the straight pipe after
the magnetic field heat treatment, diameter expansion or diameter reduction processing is
applied to a part or all of the straight pipe from one end thereof to form a disc portion 2 as
shown in FIG. 1 to FIG. The processing is suitably performed, for example, cold or at a warm
temperature of about 400 to 500 ° C., using a cold work or a narrow space spatula tightening
machine. By repeating this processing, the maximum processing ratio (ratio of end diameter to i
['l # material diameter) at the end of the disc portion 2 and U-C'3 / i to 5 times as large as the
processing flaw can be obtained. Be . Furthermore, with respect to the material processed into
the different shape (or radial) as described above, by performing the aging heat treatment vr ′
′ ′ f, while the radial magnetic anisotropy obtained in the above-described step is maintained,
the magnetic characteristics are greatly improved. The resulting one aging treatment can be
obtained, for example, by subjecting it to a heat treatment for 10 to 30 hours while being
subjected to temperature conditions which sequentially decrease in a temperature range of 500
to 620 "C. However, since the denseness L111 of the Fe-Cr-Co alloy material is largely lost by
such aging heat treatment, it is inevitable that the above-mentioned deformation processing is
completed before the aging heat treatment. . The variant magnet of the present invention thus
obtained is preferably used to form a magnetic circuit for driving the Zeiss coil of an acoustic
sound Is device such as a speaker or a telephone receiver as described in Mj1. Also, radial
magnetic anisotropy along the machined surface is generally usable as the desired magnet. As
described above, according to the present invention, it is preferable as a driving magnet for an
electroacoustic transducer by utilizing the excellent plastic formability and magnetic properties
of the Fs-Cr-Co based magnet alloy for one eye. A variant magnet with radial magnetic anisotropy
as well as its dynamical method of manufacture is provided, which also promises large
performance of the electroacoustic transducer as well as simplification of the magnetic circuit
structure due to the saving of the magnetic conductor. Hereinafter, the present invention will be
concretely described in history by examples and specific softness examples. Process of Fe4 痩
casting, hot forging, hot rolling, annealing, cold rolling using an F · Cr-Co based alloy consisting
of 12.0% Co, 25.016 Cr, 10.5% T, and the balance of Fe A flat plate about 311 thick was
obtained. After heating this plate at 950 ° C for 0.5 hours and immediately cooling with water
by water cooling, it is made straight by bending and TIG welding with both ends made of Ar f
inert gas, outer diameter 21) I got a dragon with an inner diameter of 17 Ilm and a length of
The straight pipe obtained above is subjected to heat treatment at 700 ° C. for 1 hour while
applying a magnetic field of 80,000 A / m in the axial direction, and cooled to 610 ° C. at a rate
of 50′C / hour The magnetic field heat treatment for air cooling was applied. Then, one end of
this straight pipe is subjected to an expansion process at 500 ° C. using a spatula clamp, and the
remaining length? By cutting, the disk part 2 outer diameter 52 膳 慕, straight pipe part 3 length
231 m + 7) An odd-shaped one-shape material corresponding to FIG. 1 was obtained. In the
history, the above material is heated at 620 ° C for 1 hour, cooled to 500 ° C at 10 ° C / hour,
then held at 500 ° C for 1 hour and then furnace-aged for aging treatment. , The variant magnet
of this invention was obtained. Next, as shown in FIG. 5, by bonding the mild steel magnetic
conductor 11 and the adhesive to the wedge-shaped magnet 10 (corresponding to FIG. 1) thus
obtained, a disc having a width of 1.0 inch is obtained. A magnetic circuit for driving a small
Scabase coil was obtained, which contained empty @ 12 for coil installation. On the other hand,
as shown in FIG. 6, by connecting a solid cylindrical alnico 58B stone of diameter 1011 with the
soft magnetic conductor 11 breath, a conventional driving magnetic circuit was obtained. The
dimensions and characteristics (gear tube magnetic velocity density Bg) of these magnetic
circuits were as shown in the following table. Looking at the results in the table, the magnetic
circuit using the magnet of the present invention can increase the magnetic coefficient of one
magnet, and the magnetic flux density in the same area as the magnetic circuit using the
conventional magnet or more It shows lI ′ ′ and shows excellent as a magnetic circuit. Also, as
apparent from the cross-sectional structure of the magnetic circuit shown in FIG. 5 (,), the
heteromorphism of the hetero-selite shown in @ 2 (b) to FIG. It can be seen that the magnet also
has a suitable structure for incorporation into the magnetic circuit shown in FIG.
Brief description of the drawings
FIGS. 1 (a) to 4 (a) respectively show positive 11! Of the deformed magnet according to the
embodiment of the present invention.
i times, FIG. 1 (b) to FIG. 4 (b) are also left side M. Fig. 5 (a) is a front sectional view of a small
speaker coil drive magnetic circuit incorporating the deformed magnet of the present invention,
Fig. 5 (b) is a plan view of the same, and Fig. 6 is a conventional rod magnet. FIG. 6 is a front
sectional view of an air vent circuit for driving a small-sized speaker Zeiss coil. 1 ... profiled
magnet center space, 2 ... working discs, 3 ... tubular portion, 10 ... profile magnet, 1] ... magnetic
conductor, 12 ... Zeisukoiru 設噴 for Iyatsubu, 13 ... Bar-shaped magnet. Applicant's agent 帖 帖
図 1 Fig. 9) 3 m (0) (b) 泗 5 Fig. 2 Fig. 1 "9 di 4 mouth (a) (b) 氾 6 figure procedure correction
document (method)% formula% 2. Name of the Invention A variant magnet and its manufacturing
method 3 Related patent applicant (407) Nippon Musical Instruments Manufacturing Co., Ltd.
Death of Sieve Co., Ltd. Column 4 of "Simplified description of drawing" column 8 Details of the
correction The present specification-13th to 8th to 6th lines v) y (2nd edition) will be
compensated as follows. [A set 1 (at, FIG. 2 (al, @ 3 (al and FIG. 4 (at is a different shape magnet
σ according to an embodiment of the present invention) respectively) positive sectional view, m
1 figure (a bl, Fig. 2 (bl, 5I43 Li1JfbHof Joh b 4 figure (bl is also a left side view, Fig. 2)
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description, jps58205398
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