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DESCRIPTION JPH01311800

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DESCRIPTION JPH01311800
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of molding a speaker frame used in various acoustic devices. [Prior Art] A speaker frame
is a base for attaching a diaphragm, a magnetic circuit and other parts, and this frame is made
robust so as not to resonate when the diaphragm is vibrated. Among the high-class products are
those made of aluminum, zinc, etc. by casting or die-casting, but in general, those obtained by
pressing and sticking a steel plate are used. The frame forming method using this press is a
single steel plate as a raw material drawn into a cone shape, and the drawn material is subjected
to an outline extraction and a necessary hole drilling to obtain a target frame Each of these
processes is performed by a manual feeding method in which a plate-like material is sequentially
formed by using a plurality of press devices equipped with a processing mold having the
respective purpose, and for each of the above-mentioned processes A method of mechanically
feeding and automatically forming a material to a plurality of press devices having a mold is
implemented. [Problems to be Solved by the Invention] In the above-described molding of the
speaker frame, it is necessary to carry out multi-step processing of about five times in drawing
processing with a frame having a complicated shape, and the operation is complicated. Thus,
although the latter method of automatically forming the material by machine feeding is more
efficient than the former method of manually setting the material, a plurality of pressing devices
with different processing means are installed. In addition to requiring a long processing time, the
cost for equipment investment is high, and there is a problem in practical use such as being able
to take up a space for installing the apparatus. In view of the present situation, the present
invention is intended to carry out the drawing processing on the material, the outline cutting
processing, and the punching processing on the central part of the material with an hour
difference in one process. [Means for Solving the Problems] In order to achieve the above object,
a method of molding a frame for a speaker according to the present invention has a molding
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surface comprising a cone-shaped recess, and a cutting edge is formed on the periphery of the
opening of the molding surface Forming a through hole extending in the vertical direction at the
center of the neck of the forming surface, and a hole located on the neck side of the forming
surface of the drawing and engaged with the through hole, A punch capable of moving up and
down comprising a punch member set so that the tip end surface is positioned at the neck of the
molding surface in the inoperative state by the biasing force of the tip; And forming a cutting
edge on the lower periphery of the molding surface, and providing a through hole for piercing in
the vertical direction at the center of the molding surface. Using a processing device consisting of
a fixed die, pan Lower the die to the die and use the biasing force of the spring to first draw the
plate-like material between the die and the punch with a drawing die and then lower the punch
further The outer shape is machined while utilizing the biasing force of the spring, and the punch
member passes through the hole for drilling provided on the fixed die against the biasing force of
the spring by the action of the descent type and the fixed die which descends. To form a through
hole at the center of the material.
The processing apparatus used in the method of the present invention is composed of a fixed die
and a punch which moves up and down with respect to the fixed die. In order to simultaneously
perform drawing processing, outline cutting processing and punching processing to the central
portion of the material, a spring with a strong tension is used, and a time lag is given using the
biasing force of the spring. [Operation] The molding method of the speaker frame of the present
invention. The punch moving up and down with respect to the fixed die has a forming surface
consisting of four parts of a cone shape, forms a cutting edge around the opening of the forming
surface, and penetrates up and down in the center of the neck of the forming surface A stop type
having a through hole and the neck side of the molding surface of the stop type is engaged with
the through hole, and the tip surface is positioned at the neck of the forming surface in the
inoperative state by the biasing force of the spring. Since the time difference is provided between
the operation of the throttling type and the puncturing member using the biasing force of the
spring itself, the throttling to the material is performed by one reciprocation of the punch with
respect to the fixed die. It is possible to carry out processing and outline cutting, and punching to
the center of the material. [Embodiments] Hereinafter, the method for molding a speaker frame
of the present invention will be specifically described with reference to the attached drawings.
The figure is a schematic longitudinal sectional view showing an example of a processing
apparatus used in the method of the present invention and a molding method according to this.
The frame material 12 used in this method is a thin plate material made of aluminum, zinc or the
like which has been conventionally used. The processing apparatus used for molding the frame is
composed of a fixed die 1 located at the lower part and a vertically movable punch 5 disposed at
a predetermined distance above the fixed die 1. The fixed die 1 has a molding surface 2
consisting of a cone-shaped convex part that conforms to the inner shape of the frame to be
molded, and the peripheral edge of the molding surface 2 is a cutting edge 3 by a vertical wall A
punch for forming a hole in the center of the material is formed at the center of the molding
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surface 2 and a through hole 4 for dropping chips of the material generated during the punch is
formed in the vertical direction . On the other hand, the bunch 5 is composed of the drawing die
6 and the bunch member 9, and the drawing die 6 corresponds to the outer surface of the frame
to the lower surface corresponding to the molding surface 2 of the fixed die 1. A molding surface
7 is formed of a cone-shaped recess, and a through hole 1) is formed in the center of the neck of
the molding surface 7 in the vertical direction. The punch member 9 has a cylindrical punch
member 9a located immediately above the draw mold 6 and engaged with the through hole 1)
provided in the draw mold 6, and the punch member 9a passes through the punch member 9a. It
is inserted into the hole 1) and combined with the throttling mold 6 by a spring 10 externally
fitted to the punch member 9 while maintaining a fixed distance, and the tip end face of the
punch member 9a is inoperative with the neck of the molding surface 7 It is set at a position that
forms the same plane.
The punch 5 consisting of the drawing die 6 and the punch member 9 moves up and down with
respect to the fixed die 1 by a drive mechanism (not shown). Then, the method of manufacturing
the frame for speakers using the processing apparatus which has said structure is demonstrated
below. First, as shown in FIG. 1, the material 12 made of a steel plate is made to exist between
the fixed die 1 and the punch 5. More specifically, the material 12 is made to abut on the upper
part of the die 1. . When the drive mechanism is operated and the punch 5 is lowered as shown
in FIG. 2 while holding this state, the drawing die 6 and the punch member 9a are lowered by the
biasing force of the spring 10 while maintaining the same interval as in the non-operation time.
The material 12 is pressed downward by the drawing die 6 which receives the urging force of the
spring 10, and is gradually drawn into a predetermined cone shape by the molding surface 2 of
the fixed die 1 and the molding surface 7 of the drawing die 6 It becomes a molding 13a.
Furthermore, when the punch 5 descends, the spring 10 is compressed somewhat by the action
of the fixed die 1 and the drawing die 6 which has received the influence of the fixed die 1, but it
descends while maintaining substantially the same state as described above. The material 12 is
subjected to outline cutting processing by the blade edge 8 and the cutting blade edge 3 of the
fixed die 1. The reference numeral 14 is a chip generated by this outline cutting process. If the
punch 5 is subsequently lowered from this state, the pressing force of the fixed die 1 and the
drawing die 6 causes the spring 10 to be further compressed against the biasing force, so that
the punch member having its proximal end fixed to the slider At the same time as 9a protrudes
from the neck of the drawing die 6 into the molding surface 7 and contacts the center of the
material 12, it receives a stronger pressing force from above and punches the material 12, as
shown in FIG. Is projected into the through hole 4 of the fixed die 1, and a final formed body 13b
is obtained in which the center portion of the blow molded body 13a is subjected to a punching
process. The chips 15 produced by this punching process fall through the through holes 4 of the
fixed die 1. Thereafter, the punch 5 is pulled upward and the final molded body 13b is taken out,
so that a target product frame can be obtained at once. The molding surface 2 of the die l in this
processing apparatus can be configured as a recess, and the molding surface 7 of the drawing die
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6 that forms part of the punch 5 can be configured as a protrusion. [Effect of the Invention] A
molding method of a frame for a speaker according to the present invention. The punch moving
up and down with respect to the fixed die has a forming surface consisting of four parts of a cone
shape, forming a cutting edge at the opening layer edge of the forming surface and vertically
penetrating in the center of the neck of the forming surface And the through hole formed on the
neck side of the forming surface of the drawing and engaged with the through hole, and the tip
face is inoperative on the neck of the forming surface by the biasing force of the spring. Since it
uses a processing device which is constituted by a punch member set to be positioned and which
has a time difference between the operation of the squeeze type and the punch member using
the biasing force of the spring itself, 1 of the punch for the fixed die The drawing process and the
outline cutting process to the material by the round trip.
And it is possible to carry out a hole drilling process to the center of the material. Therefore, the
time required for molding the speaker frame can be significantly shortened, and molding cost
and equipment cost can be largely reduced including the labor saving of molding, and it has
extremely great utility value in practical use. It is.
[0002]
Brief description of the drawings
[0003]
1 to 3 are schematic longitudinal sectional views showing an example of a processing apparatus
used in the method of the present invention and a molding method according to this, and FIG. 1
is a diagram for starting the apparatus with the material set r) ii FIG. 2 shows the molded state of
the primary molded body, and FIG. 3 shows the molded state of the final molded body.
1 ... fixed die 2, 7 ... molding surface 3.8 ... cutting edge 4, 1) ... through hole 5 ... punch 6 ...
aperture type 9 ... punch member 10 ... Spring 12 ... Material 13a ...-Fire molded body 13b ... Final
molded body patent applicant Minebea Co., Ltd. Mr. Atsushi Atsushi Mr. Attorney Attorney Yuki
1) All Hiroshi ■ = = Σ
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