CN103826193A - Method for manufacturing conical molding product, and oscillating plate for loudspeaker using same - Google Patents
Method for manufacturing conical molding product, and oscillating plate for loudspeaker using same Download PDFInfo
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- CN103826193A CN103826193A CN201310574972.7A CN201310574972A CN103826193A CN 103826193 A CN103826193 A CN 103826193A CN 201310574972 A CN201310574972 A CN 201310574972A CN 103826193 A CN103826193 A CN 103826193A
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Abstract
The invention provides a method for manufacturing a conical molding product which is thin, light and yet is of high mechanical strength cheaply in mass production by using a rotation molding technology utilizing synthetic resin to control a direction of orientation of the resin, and particularly provides an oscillating plate for a loudspeaker, which has a high specific modulus E/[rho], large internal loss and excellent acoustic characteristics. The molding die (1) used in the method has a cavity having a conical molding product (3) molded with a cone or a cone frustum with a thin wall in rotation symmetry. An injection part (4) has a molten resin is disposed in a top of the molding die corresponding to the top of the conical molding product. At the very moment that the molten resin is used to fill the cavity, or a period of filling, or just after the filling, at least one of an inner side and an outer side of the molding die of the conical molding product is rotated in a peripheral direction, and thus the orientation of molecules of the resin has components in a generatrix direction and the peripheral direction. The molding die is most suitable for an oscillating plate for a loudspeaker, which is formed by a liquid crystal polymer.
Description
Technical field
The present invention relates to by synthetic resin manufacture and control orientation coniform formed products manufacture method and utilize its diaphragm for speaker.
Background technology
For the oscillating plate of power type loud speaker, the intrinsic vibration that requires diaphagras, sympathetic response to cause is little, conversion efficiency good.Therefore, in oscillating plate, in order to make specific modulus E/ ρ (E: raise formula modulus, ρ: density) large as much as possible, make the frequency characteristic of high range level and smooth, suitably use the material that internal losses is large, i.e. hard and light raw material.In addition, aging damage is less is also very important.Obtaining the material that high level ground all meets these conditions is difficult to.
As diaphragm for speaker, mainly use taper coil paper all the time.Based on making E/ ρ become large object, use is mixed with the multiple raw-material composite material such as carbon fiber, biological fiber and is shaped in paper pulp.In addition, the synthetic resin materials such as polyester, aromatic polyamides, polypropylene are also as the improvement means of the specific modulus of stationery oscillating plate, and these materials are attached on honeycomb structure or other material and utilize, mainly at bass～middle pitch with using in unit.In addition, also utilize metal oscillating plate, specifically the oscillating plate excellent of beryllium system.In general the proportion of metal is heavier compared with paper, and therefore specific modulus excellence, but internal losses is less is mainly used in using between height unit.
In patent documentation 1, disclose using the liquid crystal polymer of thermoplasticity aromatic polyester class as raw material, there is the diaphragm for speaker of the orientation of liquid crystal polymer in inside.And, as the manufacture method of diaphragm for speaker, the material that makes the liquid crystal polymer that comprises thermoplasticity aromatic polyester class is disclosed, heating and melting at the temperature more than temperature liquid-crystalizing in above-mentioned liquid crystal polymer, material after this heating and melting is applied to the pressure of regulation, and be infused in the mould that maintains the temperature of regulation in the curing region of this liquid crystal polymer, the content of the multilayer oriented layer of this liquid crystal polymer that is shaped in inside.Herein, use and there is at central portion the shaping dies that injection unit, forming section are truncated cone shape and form by injection moulding.
Liquid crystal polymer has the characteristic that can be carried out by very little shearing force molecularly oriented, and its orientation is high, therefore high in molecular orientation direction intensity, with the orthogonal direction of molecular orientation direction on intensity low, existence is crackly shortcoming when thinner.So, in patent documentation 2, disclose in the time using liquid crystal polymer shaping diaphragm for speaker, form the groove of (wriggling) shape of crawling in die surface part, the flow direction of liquid crystal polymer crawls at die surface thus, the orientation of liquid crystal polymer is crawled, and puies forward thus high-intensity content.
In addition, the manufacture method of the injection-molded article of drum is disclosed in patent documentation 3,4, it has the unit that following parameter is controlled: molten resin penetrate be filled in mould in or stage of filling or just filled after, angle, rotary speed, rotating torques and the rotation time started of utilizing at least one party in inside portion and the outside portion with the mould that the rotary unit of rotating control assembly rotates in a circumferential direction to rotate.In the drum formed products obtaining thus, resin is along the circumferential direction orientated, and therefore mechanical strength is high, there is no the strength variance between the position of formed products.
Prior art document
Patent documentation
Patent documentation 1: Japanese Patent Publication 4-39279 communique
Patent documentation 2: Japanese kokai publication hei 4-77095 communique
Patent documentation 3: No. 2537131 communique of Japan Patent
Patent documentation 4: No. 3185093 communique of Japan Patent
Summary of the invention
The technical problem that invention will solve
The present invention proposes in view of the above problems, object is to address this problem, a kind of manufacture method of coniform formed products is provided, it utilizes the molecular orientation direction of the rotary forming technology control resin that uses synthetic resin, although thin and the light but high coniform formed products of mechanical strength of volume production at an easy rate, especially also provide and specific modulus E/ ρ is uprised make internal losses to become large, the diaphragm for speaker of acoustic characteristic excellence simultaneously.
For the technical scheme of technical solution problem
The present invention is in order to address the above problem, a first aspect of the present invention provides a kind of manufacture method of the coniform formed products with the circular cone of thin-walled or the Rotational Symmetry shape of the frustum of a cone, it is characterized in that: the shaping dies that uses the cavity with the above-mentioned coniform formed products that is shaped, this shaping dies also has the injection unit of molten resin at its top corresponding with the top of this coniform formed products, when molten resin is filled in to above-mentioned cavity, or the stage of filling, or after just having filled, the inside portion of shaping dies and at least one party of outside portion of coniform formed products are rotated in a circumferential direction, make the molecularly oriented of resin there is the two composition (technical scheme 1) of generatrix direction and circumferencial direction.
Herein, a second aspect of the present invention is preferably filled molten resin (technical scheme 2) from the injection unit of above-mentioned shaping dies to cavity by injection moulding.
And, the liquid crystal polymer (technical scheme 3) that the preferred above-mentioned resin of a third aspect of the present invention is thermoplasticity aromatic polyester class.
Specifically, the preferred above-mentioned coniform formed products of a fourth aspect of the present invention has: conus portion; The top of inaccessible this conus portion, the occlusive part intersecting with the pivot of shaping dies; With bottom at the described conus portion flange part (technical scheme 4) towards radial direction foreign side.
And a fifth aspect of the present invention is used the coniform formed products being shaped by the manufacture method of above-mentioned coniform formed products, by the part excision of this coniform formed products, manufacture the diaphragm for speaker (technical scheme 5) of conically shaped shape.
Herein, a sixth aspect of the present invention is used has the circular cone table top orthogonal with the pivot of shaping dies at top, there is the coniform formed products towards the flange part of radial direction foreign side in bottom, by the occlusive part of this coniform formed products and flange part excision, manufacture the diaphragm for speaker (technical scheme 6) of conically shaped shape.
Invention effect
The manufacture method of coniform formed products according to the present invention as described hereinbefore, the manufacture method of the coniform formed products with the circular cone of thin-walled or the Rotational Symmetry shape of the frustum of a cone is provided, use has the shaping dies of the cavity of the above-mentioned coniform formed products that is shaped, this shaping dies also has the injection unit of molten resin at its top corresponding with the top of this coniform formed products, when molten resin is filled in to above-mentioned cavity, or the stage of filling, or after just having filled, the inside portion of shaping dies and at least one party of outside portion of coniform formed products are rotated in a circumferential direction, make the molecularly oriented of resin there is the two composition of generatrix direction and circumferencial direction, therefore, the molecularly oriented of the resin of the cone shape part of coniform formed products reverses, also there is sufficient mechanical strength even if be configured as thus thin-walled, the characteristic inhomogeneities of the different parts of formed products is eliminated, shape stability is also excellent.Herein, " torsion of molecularly oriented " refer to that molecularly oriented has to a certain degree with respect to the generatrix direction of coniform formed products.
In addition, in the case of using the liquid crystal polymer of thermoplasticity aromatic polyester class, mobility excellence when shaping, therefore thin formed products can easily be shaped, in addition can be orientated in one direction by very little shearing force, make the molecularly oriented of resin there is the composition of generatrix direction and circumferencial direction, although therefore can obtain also high formed products of the high and epistasis rate of thin mechanical strength.
And, use the coniform formed products being shaped by the manufacture method of above-mentioned coniform formed products, excise a part for this coniform formed products and form conically shaped shape, can manufacture diaphragm for speaker thin and that intensity is high.While particularly using liquid crystal polymer to manufacture, even if be shaped thinly and light, also, because E/ ρ is high, internal losses is large, therefore can manufacture the diaphragm for speaker of acoustic characteristic excellence.
Herein, use there is the top of conus portion, inaccessible this conus portion and the occlusive part that intersects with the pivot of shaping dies and in the bottom of above-mentioned conus portion towards the coniform formed products of the flange part of radial direction foreign side, by the occlusive part of this coniform formed products and flange part excision, manufacture the diaphragm for speaker of conically shaped shape, can only use the stable coniform part of engineering properties of coniform formed products, therefore can manufacture the diaphragm for speaker that acoustic characteristic is more excellent.
Accompanying drawing explanation
Fig. 1 is the simple sectional view of the shaping dies that uses in the manufacture method of coniform formed products of the present invention.
Fig. 2 is the stereogram from the coniform formed products of shaping dies taking-up.
Fig. 3 is the sectional view of this coniform formed products.
Fig. 4 is the explanation stereogram that represents the direction of orientation of the resin of the coniform formed products being shaped by the present invention.
Fig. 5 is the stereogram of diaphragm for speaker.
Description of reference numerals
1 shaping dies
2 cavitys
3 coniform formed products
4 injection units
5 interior side molds
6 die main bodies
7 outside moulds
8 bearings
9 movement limiting portions
10 rotary units
11 ejection pins
12 conus portions
13 occlusive parts
14 flange parts
15 sprue gates
16 pinions
17 timing belts
18 diaphragm for speaker
R direction of rotation
P molecular orientation direction
B generatrix direction
Embodiment
Based on execution mode, detailed content of the present invention is described below.Fig. 1 represents to use the shaping dies of the rotary forming technology adopting in the manufacture method of coniform formed products of the present invention, Fig. 2 and Fig. 3 represent the coniform formed products being shaped thus, in figure, symbol 1 represents shaping dies, and 2 represent cavity, and 3 represent coniform formed products.
The present invention is a kind of manufacture method of the coniform formed products with the circular cone of thin-walled or the Rotational Symmetry shape of the frustum of a cone, it is characterized in that: the shaping dies that uses the cavity with the above-mentioned coniform formed products that is shaped, this shaping dies also has the injection unit of molten resin at its top corresponding with the top of this coniform formed products, when molten resin is filled in to above-mentioned cavity, or the stage of filling, or after just having filled, the inside portion of shaping dies and at least one party of outside portion of coniform formed products are rotated in a circumferential direction, make the molecularly oriented of resin there is the two composition of generatrix direction and circumferencial direction.
, from the injection unit 4 of above-mentioned shaping dies 1, cavity 2 is filled to molten resin by injection moulding herein, above-mentioned coniform formed products 3 is shaped.
Specifically, as shown in Figure 1, above-mentioned shaping dies 1 has: the interior side mold 5 of Rotational Symmetry shape; Rotatably keep the die main body 6 of this interior side mold 5; With form the outside mould 7 of cavity 2 with the end face of above-mentioned interior side mold 5 and die main body 6.And, above-mentioned interior side mold 5 inserts in fixed position by journal bearing 8 and movement limiting portion axially 9 in rotatably with respect to above-mentioned die main body 6, the inner side forming face that forms the leading section of the inner surface of above-mentioned coniform formed products 3 is given prominence to from the end face of above-mentioned die main body 6, and is provided with rotary unit 10 at base end part.In addition, above-mentioned outside mould 7 has the outside forming face of the outer surface that forms above-mentioned coniform formed products 3, forms above-mentioned cavity 2 with the end joined of above-mentioned die main body 6.In addition,, from the end face demoulding of above-mentioned die main body 6, take out coniform formed products 3.The mode that above-mentioned injection unit 4 connects outside forming face with the outside from above-mentioned outside mould 7 forms.In addition, arrange in the mode that can stretch out and submerge for the ejection pin 11 of the above-mentioned coniform formed products 3 of end face extrusion from above-mentioned die main body 6.
In the present embodiment, as shown in Figures 2 and 3, above-mentioned coniform formed products 3 for the occlusive part 13 that there is the top of conus portion 12, inaccessible this conus portion and intersect with the pivot of interior side mold 5 and in the bottom of above-mentioned conus portion 12 towards the shape of the flange part 14 of radial direction foreign side.Herein, above-mentioned occlusive part 13 is circular cone table tops orthogonal with the pivot of interior side mold 5.In addition are parts corresponding with above-mentioned injection unit 4 at the sprue gate 15 that projects to above-mentioned occlusive part 13 center.In the time that the injection unit 4 from above-mentioned outside mould 7 is filled molten resin, first spread radially at occlusive part 13, spread equally radially and to flows, finally fill up flange part 14 at conus portion 12 afterwards.For molten resin is filled in cavity 2 equably, preferably the pivot of above-mentioned coniform formed products 3 is configured towards vertical direction, but also can configure towards horizontal direction.
Then, by in molten resin injection fillers is in the cavity 2 of shaping dies 1 or fill stage or just filled after, utilize above-mentioned rotary unit 10 that above-mentioned interior side mold 5 is along the circumferential direction rotated, make the molecular orientation direction of resin there is the composition of circumferencial direction., in the time that above-mentioned interior side mold 5 is rotated, control its anglec of rotation, rotation speed, rotating torques and rotation time started herein, control thus the size (vector) of the composition of the circumferencial direction of molecular orientation direction.Above-mentioned shaping dies 1 also has above-mentioned molecularly oriented control unit.This rotary forming technology itself is known.
In the present embodiment, above-mentioned rotary unit 10 adopts following structure: at the fixing pinion 16 of base end part of above-mentioned interior side mold 5, at the pinion coiling timing belt (timing belt) 17 of this pinion 16 and not shown drive motors, be rotated control, but also can use other the rotary unit such as sprocket and chain driving, gear drive.In addition, in the present embodiment, the above-mentioned interior side mold 5 that becomes core is rotated, but also can make above-mentioned outside mould 7 rotate.In addition, in principle, also can design rotation and make above-mentioned interior side mold 5 and outside mould 7 the two rotations poorly.
Like this, being shaped when above-mentioned coniform formed products 3, in the time making above-mentioned interior side mold 5 along the R direction rotation of Fig. 1, the molten resin of filling from above-mentioned injection unit 4 is along with the inner side forming face rotation of interior side mold 5, and flow direction reverses as shown in Figure 4.In general resin exists the molecular orientation direction P of strand towards the tendency of flow direction.In Fig. 4, represented, the molecular orientation direction P of the conus portion 12 of above-mentioned coniform formed products 3 has the example of the composition of generatrix direction and circumferencial direction.In the time that above-mentioned interior side mold 5 rotates, in the time that the anglec of rotation, rotary speed or rotating torques are larger, the composition of the circumferencial direction of molecular orientation direction P increases.
And, as above-mentioned resin, use the liquid crystal polymer of thermoplasticity aromatic polyester class.Liquid crystal polymer is fine and close crystal structure, can realize thus high rigidization, and has the distinctive high fluidity of liquid crystal, can realize thus thin-walled property, lightweight.And it is few that liquid crystal polymer has in the time of melting molecule association each other, even if be subject to very little shearing force, also character facing one direction of molecularly oriented, in the character for showing crystallization in aqueous.And, when cooling, while solidifying, it is in stable condition and be kept.That is, in the time being shaped, strand carries out molecularly oriented on flow direction, produces the stiffening effect of oneself being strengthened just like own, obtains high intensity and modulus of elasticity (young modulus).In addition known, although modulus of elasticity is high, but still show very excellent absorption of vibrations characteristic.
And by rotary forming technology, the molecular orientation direction of liquid crystal polymer has circumference composition, can strengthen crystalline orientation, and then can reach by high speed injection the be shaped further molecularly oriented intensity and the thin-walled property that carry out.
The above-mentioned liquid crystal polymer using is in the present embodiment the trade name of Siveras L304M35(toray Co., Ltd).Molding condition is 350 ℃ of resin temperatures, 150 ℃ of mold temperatures, 0.3 second inject time, 5 seconds cooling times.The size of coniform formed products (conus portion 12) is external diameter 120mm, thickness 0.3mm, and the torsion angle α of molecularly oriented is 15 °.Herein, torsion angle α refers to the tangential direction angulation at Fig. 4 median generatrix direction B and molecularly oriented.
In the time there is no torsion angle α, (common injection moulding) also can form, but the weak strength in the direction (circumferencial direction) vertical with molecular orientation direction (flow direction), easily fracture.On the other hand, the formed products that is provided with torsion angle α can not rupture., cut out sample (width 5mm, length 50mm) from formed products herein, carry out tension test.The modulus of elasticity of the sample that result torsion angle α is 0 is 13MPa, and on the other hand, torsion angle α is that the modulus of elasticity of the sample of 15 ° is 22MPa, is increased to approximately 1.7 times.
Then, as shown in Figure 5, use the coniform formed products 3 being shaped by above-mentioned manufacture method, this coniform formed products 3 is processed, manufacture the diaphragm for speaker 18 that is configured as taper tubular.Specifically, as shown in Figure 5, excise occlusive part 13 and the flange part 14 of above-mentioned coniform formed products 3, manufacture the diaphragm for speaker of tapered barrel shape.Then, although not shown, at the periphery trip edge of above-mentioned diaphragm for speaker 18 parts, and engage voice coil loudspeaker voice coil and central lid at central portion, they and magnet are together installed on to framework, manufacture power type loud speaker.
Like this, use liquid crystal polymer to utilize rotary forming technology, the molecular orientation direction P of conus portion 12 is reversed, there is the two composition of generatrix direction and circumferencial direction, the unexistent high E/ ρ of diaphragm for speaker that existing liquid crystal polymer is manufactured can be reached thus, the cost reduction of high productivity (injection moulding) can be reached.In the time that specific modulus uprises, accelerate at the velocity of sound of oscillating plate internal delivery, become the loud speaker of acoustic characteristic excellence.And then, control by molding condition, make formed products there is the complicated shape of hot pressing, or add packing material in order to improve internal losses, can make thus the big or small design freedom of the internal losses of E/ ρ uprise, the oscillating plate that is suitable for each use range most can be provided thus.
Outside the liquid crystal polymer of thermoplasticity aromatic polyester class, also can use polypropylene (PP), polyethylene (PE), polystyrene, PETG (PET), polymethyl methacrylate, polymethylpentene (TPX), Polyetherimide (PEI) etc.
Further, in above-mentioned synthetic resin, can suitably fill the packing material for improving acoustic characteristic.
Claims (6)
1. a manufacture method with the coniform formed products of the circular cone of thin-walled or the Rotational Symmetry shape of the frustum of a cone, is characterized in that:
Use has the shaping dies of the cavity of the described coniform formed products that is shaped, this shaping dies also has the injection unit of molten resin at its top corresponding with the top of this coniform formed products, when molten resin is filled in to described cavity or fill stage or just filled after, the inside portion of shaping dies and at least one party of outside portion of coniform formed products are rotated in a circumferential direction, make the molecularly oriented of resin there is the two composition of generatrix direction and circumferencial direction.
2. the manufacture method of coniform formed products as claimed in claim 1, is characterized in that:
From the injection unit of described shaping dies, cavity is filled to molten resin by injection moulding.
3. the manufacture method of coniform formed products as claimed in claim 1 or 2, is characterized in that:
Described resin is the liquid crystal polymer of thermoplasticity aromatic polyester class.
4. the manufacture method of the coniform formed products as described in any one in claim 1～3, is characterized in that:
Described coniform formed products has: conus portion; The top of inaccessible this conus portion, the occlusive part intersecting with the pivot of shaping dies; With bottom at the described conus portion flange part towards radial direction foreign side.
5. a diaphragm for speaker, is characterized in that:
Use the coniform formed products being shaped by the manufacture method of the coniform formed products described in any one in claim 1～4, the part excision of this coniform formed products is made to conically shaped shape.
6. a diaphragm for speaker, is characterized in that:
The coniform formed products that uses the manufacture method by coniform formed products claimed in claim 4 to be shaped, excises the occlusive part of this coniform formed products and flange part and makes conically shaped shape.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012251822A JP2014097645A (en) | 2012-11-16 | 2012-11-16 | Method for producing conical molded part and diaphragm for speaker thereby |
| JP2012-251822 | 2012-11-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103826193A true CN103826193A (en) | 2014-05-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310574972.7A Pending CN103826193A (en) | 2012-11-16 | 2013-11-15 | Method for manufacturing conical molding product, and oscillating plate for loudspeaker using same |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2014097645A (en) |
| CN (1) | CN103826193A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111161936A (en) * | 2019-12-26 | 2020-05-15 | 湖南航天磁电有限责任公司 | Permanent magnetic ferrite device for converging magnetic induction lines and forming die and preparation method thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10547949B2 (en) | 2015-05-29 | 2020-01-28 | EVA Automation, Inc. | Loudspeaker diaphragm |
| GB2538809B (en) * | 2015-05-29 | 2021-08-25 | B & W Group Ltd | Loudspeaker diaphragm |
-
2012
- 2012-11-16 JP JP2012251822A patent/JP2014097645A/en active Pending
-
2013
- 2013-11-15 CN CN201310574972.7A patent/CN103826193A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111161936A (en) * | 2019-12-26 | 2020-05-15 | 湖南航天磁电有限责任公司 | Permanent magnetic ferrite device for converging magnetic induction lines and forming die and preparation method thereof |
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| Publication number | Publication date |
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| JP2014097645A (en) | 2014-05-29 |
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Application publication date: 20140528 |