close

Вход

Забыли?

вход по аккаунту

?

JPS5785794

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS5785794
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 3 are explanatory views showing a
manufacturing process of a speaker diaphragm according to the present invention. 1 · · · · · · · · · · ·
· · · · · · · · · · · · · · Thermoplastic sheet, 2 · · · · · · · · · · · · · · mold, 4 · · · · · mold surface, 5 · · · holding
surface, 10 ...... vacuum holes 16 ...... pressing frame, 17 ...... trimming cutter, 21 ...... moldings.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm for a
speaker molded by vacuum molding. In the conventional diaphragm for this type of speaker,
since the molded product is taken out of the mold after completion of vacuum molding and
trimming of unnecessary parts is performed, trimming processing is separately required in
addition to vacuum molding, and Since the pooling process is interposed between the molding
and trimming, accidents such as material scraping and damage to the molded product may occur.
Furthermore, since the voice coil attachment portion and the edge attachment portion are
trimmed after molding, it was difficult to obtain a diaphragm with a good concentricity / 72 v
beaker. Therefore, in order to solve the above-mentioned drawbacks, the present invention can
reduce the trimming process separately by trimming the unnecessary portion simultaneously
with the completion of the vacuum forming, and at the same time, improve the accuracy of the
molded product etc. The purpose is to obtain a speaker diaphragm that can be used. Hereinafter,
the present invention will be described based on the embodiments of the drawings. FIGS. 1 to 3
are explanatory views showing a molding process of a speaker diaphragm according to the
present invention. In the drawing, 1 is a thermoplastic sheet to be molded into a speaker
diaphragm, 2 is a heater for heating the sheet 1 to a moldable temperature, and the heater 2 is
directly on the mold 3 to be described later The mold surface 4 of the mold 3 configured to be
movable is formed in an inverted conical shape, and the top of the mold surface 4 is formed in a
circular recess 5 of a predetermined diameter and height. In the circular recess 5, a cylindrical
chamber 6 having a diameter smaller than that of the thermoplastic sheet 1 is connected
downward. In the cylindrical chamber 6, a disc 7 constituting the bottom of the circular recess 5
11-05-2019
1
is disposed so as to be vertically movable, and the disc 7 is urged upward by a spring 8. A step 9
is formed between the cylindrical chamber 6 and the circular recess 5. A plurality of vacuum
holes 10 are bored in the sloped portion of the mold surface 4, and after these vacuum holes 10
are united by the flow passage 11, via the valve 12 and the leak valve 13, respectively, It is
connected to a vacuum pump (not shown) and a compression pump. Reference numeral 14
denotes a holding surface formed on the outer periphery of the upper surface of the mold 3. The
holding surface 14 is for cutting along the circumference at a position separated from the outer
peripheral edge of the mold surface 4 by the width of the edge sticking portion. The groove 15 is
formed. Reference numeral 16 denotes a presser frame for fixing the thermoplastic sheet 1 to the
holding surface 14 described above. Reference numeral 17 denotes a trimming cutter, which is
located immediately above the mold 1 and is vertically movable.
The lower surface of this trimming cutter 7 is formed in the same shape as the mold surface 4 of
the mold 1 and the top of the trimming cutter 7 is a cutter blade portion 18, but the blade
portion 18 is A cylindrical shape having a diameter the same as that of the cylindrical chamber 6
and slightly higher than the height of the circular recess 5 is provided, and 18 m is a peripheral
portion of the center blade portion 18. Further, a ring blade portion 19 is provided on the lower
surface of the outer periphery of the trimming cutter 7 so as to protrude therefrom, and the
blade portion 19 is formed to be freely fitted in the cutting groove 15. Next, a process of
manufacturing a speaker diaphragm according to the above embodiment will be described. First,
as shown in FIG. 1, the thermoplastic sheet 1 is placed on the holding surface 14 of the mold 3
and fixed by the pressing frame 16, and the thermoplastic sheet 1 is heated by the heater 2 to its
molding temperature to soften it. . Then, the valve n is opened and the air in the cavity 20 formed
between the thermoplastic sheet 1 and the mold surface 4 of the mold 3 is reduced in pressure
through the vacuum hole 10 and the flow passage 11 by the vacuum pump. And, as shown in
FIG. 2, the softened thermoplastic sheet 1 is adsorbed on the mold surface 4. The heater 2 is
moved to another position immediately before the suction and the trimming cutter 7 is lowered.
Then, at the same time as the thermoplastic sheet 1 is adsorbed to the mold surface 4 and
molded, the trimming cutter 17 is pressure-bonded to the surface of the one molded product 21.
Since the center blade 18 presses the disc 7 downward against the elastic force of the spring 8 as
shown in FIG. 3 by this pressure bonding, the bottomed cylindrical portion of the molded product
21 formed by the circular recess 5 The bottom plate 22m of the bottomed cylindrical portion 22
is sheared from the peripheral plate 22b by the peripheral portion 18 & of the center blade
portion 18 and the die 30 stepped portion 9 to form a voice coil attachment portion. On the
other hand, in the peripheral portion 23 of the molded product 21 in contact with the holding
surface 14, an edge sticking portion is formed by the ring force 19 fitting the cutting groove 15
and shearing the peripheral portion 23. After the above-mentioned vacuum forming and
trimming are completed, the molded article 21 is cooled, and when the molded article has cooled
and solidified, the valve 12 is closed. Then, after raising the trimming cutter 17 and removing the
presser frame 16, the leak valve 13 is opened to blow compressed air between the mold surface
11-05-2019
2
4 and the molded product 21, thereby peeling the molded product 21 from the mold surface 4.
Although the vacuum forming machine of the embodiment is of the female type (straight
vacuum) method, it may be of the male type (drape vacuum) method, and the shape of the mold
surface 4 is a dome. It is good also as a shape and other shapes.
According to the present invention, after heating the thermoplastic sheet 1 fixed on the holding
surface 14 of the mold 3 to a forming temperature as described above, the thermoplastic sheet 1
is adsorbed to the forming surface 4 of the mold 3 by vacuum action and formed simultaneously
Since unnecessary portions of the molded product 21 are sheared and trimmed by the mold 3
and the trimming cutter 7, trimming time can be separately reduced, and concentricity is good
because trimming is performed simultaneously with vacuum forming. It is possible to obtain a
diaphragm for a speaker and also to prevent material handling loss and contamination, breakage,
etc. of a molded product since there is no pooling step between vacuum molding and trimming.
11-05-2019
3
Документ
Категория
Без категории
Просмотров
0
Размер файла
11 Кб
Теги
jps5785794
1/--страниц
Пожаловаться на содержимое документа