CN205800228U - A kind of mould of continuous fiber reinforced thermoplastic prepreg tape panel - Google Patents
A kind of mould of continuous fiber reinforced thermoplastic prepreg tape panel Download PDFInfo
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- CN205800228U CN205800228U CN201620783252.0U CN201620783252U CN205800228U CN 205800228 U CN205800228 U CN 205800228U CN 201620783252 U CN201620783252 U CN 201620783252U CN 205800228 U CN205800228 U CN 205800228U
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- framed
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Abstract
The utility model discloses the mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel, mould includes the cope match-plate pattern adapted set gradually from top to bottom, framed and lower bolster, described cope match-plate pattern near framed one end or/and described lower bolster is provided with boss near framed one end, the cross-sectional area of described boss is less than framed cross-sectional area, the described framed groove adapted with boss that is provided with, is provided with the die cavity adapted with boss in described groove.The beneficial effects of the utility model: mould structure is simple, molding is easy, makes the sheet material after molding have excellent mechanical property；The forming method of mould is simple, efficiency is high, and after making molding, the fiber of sheet material is parallel to each other and arranges straight, gives full play to the potentiation of fiber, improves bearing capacity.
Description
Technical field
This utility model relates generally to continuous fiber reinforced thermoplastic resin based composites preparing technical field, specifically
A kind of mould of continuous fiber reinforced thermoplastic prepreg tape panel.
Background technology
Continuous fiber reinforced thermoplastic composite material sheet material, due to reinforcing fiber continuous arrangement in sheet material, has remote super
Chopped fiber and the mechanical property of long fiber reinforced thermoplastic composites sheet material, have high-strength light, corrosion-resistant, green non-pollution
Etc. excellent specific property, it is possible to use as structural material, it it is the focus of current research and development.Evaluation continuous lod thermoplastic
Property one of the good and bad key of polymer matrix composites plate property be whether to give full play to the reinforced effects of continuous fiber.
This production technology of patent CN20108608608 includes: first thermoplastic resin is made certain thickness thin film, will
The thermoplastic resin making thin film is placed on fibrous layer, then thermoplastic resin heats together with fiber pressurization, is cooled to
Type, prepares sheet material, finally obtains sheet material by compressing for the laying of multiple sheet layer.
First banding continuous fiber prepreg is laid in mould by patent CN2012105603896, is then placed in heat one-tenth
In type machine, no pressure matched moulds preheats, pressure heat-preserving, then die sinking after prepreg softens；Finally material is moved to cold press
The constant cooling molding of middle holding pressure, obtains continuous fiber reinforced thermoplastic sheet material.
This preparation technology of patent CN2015102336971 is to utilize impregnated tape, fibre bundle or mixed yarn to multilamellar impregnated tape
Fabric carries out longitudinal direction partially or completely and interts, and forms continuous print three dimensional structure, and by heating pressurization, cooling and shaping
Process obtains the internal continuous fiber reinforced thermoplastic prepreg tape fabric sheet material with three dimensional structure.
The most existing continuous fiber reinforced thermoplastic resin based composite material sheet material preparation technology, although prepared tool
Having the composite board of certain mechanical property, fiber serves certain reinforced effects.But above-mentioned patent is the most simply
Continuous fibre enhancement resin base prepreg tape is laid layer by layer, have ignored what fiber occurred because of the flowing of resin in hot pressing
Displacement and bending, fail to make continuous fiber play one's part to the full in sheet material, causes stretching, bending and impact property to reduce.
Utility model content
In order to solve deficiency of the prior art, the purpose of this utility model is: provide a kind of continuous lod heat
The mould of plasticity prepreg tape panel, simple in construction, molding is easy, during plate forming, by boss with recessed
With clamped fibers, the cooperation of groove, can thereby may be ensured that the fiber alignment after plate forming is neat, straight, give full play to fiber
Potentiation, raising bearing capacity, so that the sheet material after molding has excellent mechanical property.
This utility model for achieving the above object, is achieved through the following technical solutions:
The mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel, including adapting of setting gradually from top to bottom
Cope match-plate pattern, framed and lower bolster, described cope match-plate pattern near framed one end or/and described lower bolster sets near framed one end
Having boss, the cross-sectional area of described boss is less than framed cross-sectional area, and described framed being provided with adapts with boss
Groove, is provided with the die cavity adapted with boss in described groove.
The cross-sectional area of described boss is gradually increased to away from framed one end by near framed one end.
Described boss is trapezoid boss or truncated rectangular pyramids shape boss.
The inclined-plane of described boss and boss angle between the plane of framed one end are between 135 °～165 °.
The cross-sectional area of described die cavity is identical away from the cross-sectional area of framed one end with truncated rectangular pyramids shape boss.
The corner of described die cavity, the corner of boss are rounding.
The radius of described rounding is 1 millimeter～5 millimeters.
Described die cavity is square or rectangle.
The cross-sectional area of described die cavity is 200 × 200mm2。
Contrast prior art, this utility model has the beneficial effects that:
1, this utility model is provided with prepreg tape device for fixing end part in sheet material hot pressing, makes continuous fiber not because of molten
The flowing of melt resin and bend and displacement, thus given full play to the reinforced effects of continuous fiber so that the plate prepared
Material has excellent mechanical property；Mould structure is simple, and forming method is simple, efficiency is high, makes the fiber of sheet material after molding mutual
Parallel and arrange straight, give full play to the potentiation of fiber, improve bearing capacity.
2, the cross-sectional area of boss is by being gradually increased to away from framed one end near framed one end, facilitate cope match-plate pattern,
Lower bolster is placed on framed interior, and when conveniently stripped after plate forming；Simultaneously convenient by the inclined-plane of boss and the cooperation of groove
Clamping to continuous fiber reinforced thermoplastic prepreg tape.
3, boss is trapezoid boss, it is simple to clamping continuous fiber reinforced thermoplastic prepreg tape in a direction, boss is four
Prismatic table shape boss, it is simple to all clamp continuous fiber reinforced thermoplastic prepreg tape in both direction.
4, the inclined-plane of boss and boss angle between the plane of framed one end are between 135 °～165 °, i.e. make
Angle ambiguity between inclined-plane and the vertical plane of boss is between 15 °～45 °, it is ensured that the inclined-plane of boss can rely on mould certainly
Weight and the hot-press equipment pressure clamping effect to continuous fiber reinforced thermoplastic prepreg tape, facilitate the clamping of fiber, and will not make
Fibrous fracture.
5, the cross-sectional area of die cavity is identical away from the cross-sectional area of framed one end with truncated rectangular pyramids shape boss, it is simple to sheet material
The control of compact dimensions.
6, the corner of die cavity, the corner of boss are rounding so that formed after cope match-plate pattern, framed and lower bolster matched moulds
Die cavity inner surface flat smooth, it is to avoid in hot pressing, mould corner exists stress and concentrates, and decreases prepared sheet material and deposits
Defect, it is ensured that the homogeneity of sheet material physical property.
7, the cross-sectional area of die cavity is 200 × 200mm2, the mould conventional with laboratory adapts, it is simple to sheet material becomes
The preparation of mechanical property standard sample after type.
Accompanying drawing explanation
Accompanying drawing 1 is the mould structure schematic diagram of embodiment 1；
Accompanying drawing 2 is the mould structure schematic diagram of embodiment 2；
Accompanying drawing 3 is the mould structure schematic diagram of embodiment 3；
Accompanying drawing 4 is the mould structure schematic diagram of embodiment 4；
Accompanying drawing 5 is the mould structure schematic diagram of embodiment 5；
Label shown in accompanying drawing: 1, cope match-plate pattern；2, framed；3, lower bolster；4, boss；5, groove；6, die cavity.
Detailed description of the invention
In conjunction with the drawings and specific embodiments, the utility model is described in further detail.Should be understood that these embodiments are only used for
This utility model is described rather than limits scope of the present utility model.In addition, it is to be understood that reading this utility model instruction
Content after, this utility model can be made various changes or modifications by those skilled in the art, and these equivalent form of values fall equally
In scope defined herein.
The mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel, including adapting of setting gradually from top to bottom
Cope match-plate pattern 1, framed 2 and lower bolster 3, cope match-plate pattern 1, framed 2 identical with the cross-sectional area of lower bolster 3.Described cope match-plate pattern 1 leans on
One end of near-lying mode frame 2 is or/and described lower bolster 3 is provided with boss 4 near one end of framed 2, and the cross-sectional area of described boss 4 is little
In the cross-sectional area of framed 2, it is preferred that the cross-sectional area of described boss 4 by near framed 2 one end to away from framed 2
One end be gradually increased.Described framed 2 are provided with the groove 5 adapted with boss 4, the angle of inclination of the sidewall of groove 5, it should
Consistent with the angle of inclination on the inclined-plane of boss 4 so that after matched moulds, the groove 5 of framed 2 and the boss 4 of cope match-plate pattern 1, lower bolster 3 are answered
Relative close is fitted, thus ensure that this utility model clamping effect to prepreg tape.Cope match-plate pattern 1, framed 2 and lower bolster 3 groups
The boss 4 can be made after dress, it is to avoid spilling material weakens locked mode pressure to be pressed in groove 5, so that outside the sheet material suppressed
Seeing flat smooth, quality is closely knit, it is only necessary to go deburring, it is not necessary to complicated subsequent treatment.It is provided with in described groove 5 and boss 4 phase
The die cavity 6 adapted to, die cavity 6 is for the molding of sheet material.
This utility model in use, oblique first with cope match-plate pattern 1, framed 2, the deadweight of lower bolster 3, boss 4 and groove 5
Face will equalize effectively clamping continuous fiber reinforced thermoplastic prepreg tape, makes continuous fiber reinforced thermoplastic prepreg tape keep flat
OK, then in hot pressing, the recycling powerful pressure of hot-press equipment, will be continuously to boss 4 and the effect of the sidewall of groove 5
The end of fiber reinforced thermolplastic prepreg tape is fixed, and the fiber being possible to prevent in continuous fiber reinforced thermoplastic prepreg tape exists
Hot pressing produces because of the flowing of molten resin bending and displacement, affects planarization and the mechanical property of sheet material, utilize this
Mould can make fiber give full play to the reinforced effects of fiber.
The cross-sectional area of described boss 4 is gradually increased to away from framed one end by near framed one end, facilitates upper mold
In plate 1, lower bolster 3 are placed on framed 2, and when conveniently stripped after plate forming；Simultaneously by the inclined-plane of boss 4 and groove 5
Coordinate the convenient clamping to continuous fiber reinforced thermoplastic prepreg tape.
Described boss 4 is trapezoid boss 4, and the cross-sectional area of trapezoid boss 4 by near framed 2 one end to away from mould
One end of frame 2 is gradually increased, it is simple to all clamp continuous fiber reinforced thermoplastic prepreg tape in a direction.
Described boss 4 is truncated rectangular pyramids shape boss 4, and the cross-sectional area of truncated rectangular pyramids shape boss 4 is by one end of close framed 2
It is gradually increased to the one end away from framed 2, it is simple to all clamp continuous fiber reinforced thermoplastic prepreg tape in both direction.
The inclined-plane of described boss 4 and the boss 4 angle between the plane of framed 2 one end between 135 °～165 °,
Make the Angle ambiguity between inclined-plane and the vertical plane of boss 4 between 15 °～45 °, to ensure that the inclined-plane of boss 4 can rely on mould
Tool deadweight and the hot-press equipment pressure clamping effect to continuous fiber reinforced thermoplastic prepreg tape.
The cross-sectional area of described die cavity 6 is identical away from the cross-sectional area of framed 2 one end with truncated rectangular pyramids shape boss 4, makes
After obtaining matched moulds, the groove 5 of framed 2 and the boss 4 of cope match-plate pattern 1, lower bolster 3 answer relative close to fit, thus ensure that this practicality is new
The type clamping effect to continuous fiber reinforced thermoplastic prepreg tape.
The corner of described die cavity 6, the corner of boss 4 are rounding so that cope match-plate pattern 1, framed 2 and lower bolster 3 matched moulds
The die cavity inner surface flat smooth of rear formation, it is to avoid in hot pressing, mould corner exists stress and concentrates, and decreases prepared
Sheet material exist defect, it is ensured that the homogeneity of sheet material physical property.
The radius of described rounding is 1 millimeter～5 millimeters.
Described die cavity 6 is square or rectangle.
The cross-sectional area of described die cavity is 200 × 200mm2。
The forming method of a kind of continuous fiber reinforced thermoplastic prepreg tape panel, comprises the following steps:
1) in die cavity 6, lay continuous fiber reinforced thermoplastic prepreg tape, and continuous fiber reinforced thermoplastic in the same direction is pre-
Leaching band is parallel to each other, the length of the continuous fiber reinforced thermoplastic prepreg tape length more than framed 2, pressurization cope match-plate pattern 1 and lower mold
Plate 3, and the two edges of continuous fiber reinforced thermoplastic prepreg tape can be pressed between the sidewall of boss 4 and groove 5；Even
Continuous fiber reinforced thermolplastic prepreg tape parallel laid or vertical laying or square crossing are laid, at cope match-plate pattern 1 and lower bolster 3
Upper smearing release agent or laying polyester film, it is simple to the demoulding after molding.
4) by through step 3) process after cope match-plate pattern 1, framed 2 and lower bolster 3 matched moulds molding after mould put into hot press
Carrying out hot-forming, wherein preheating time is 3 minutes, and preheating temperature is 220 DEG C, and hot pressing temperature is 220 DEG C, and pressure is 15MPa,
Dwell time 8 is min；
5) hot-forming complete after cold moudling, cold moudling complete after can demoulding obtain continuous fiber reinforced thermoplastic
Prepreg tape.Cold moudling mode is to be passed through cooling water in cold pressing plate, after cope match-plate pattern 1, framed 2 and lower bolster 3 matched moulds molding
Mould cools.
Embodiment 1:
As shown in Figure 1, the mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel, including the most successively
The cope match-plate pattern 1 adapted, framed 2 and the lower bolster 3 arranged, described cope match-plate pattern 1 is provided with trapezoid boss 4 near one end of framed 2,
The cross-sectional area of described trapezoid boss 4 cross-sectional area less than framed 2, and the cross-sectional area of trapezoid boss 4 is by close
One end of framed 2 is gradually increased to the one end away from framed 2, and described framed 2 are provided with the groove 5 adapted with trapezoid boss,
The i.e. angle of inclination of two inclined-plane sides of groove 5 is consistent with the bevel angle of trapezoid boss dual-side, two inclined-planes of groove 5
The width of side is identical with the inclined-plane of trapezoid boss dual-side, so after cope match-plate pattern 1, framed 2, lower bolster 3 matched moulds, and framed 2
Answer corresponding with the tapered slope of the upper and lower template of cope match-plate pattern 1 and fit tightly, thus ensure that tapered slope is to prepreg tape
Clamping effect.The die cavity 6 adapted with trapezoid boss it is provided with in described groove 5.The situation that the present embodiment is conducted oneself with dignity at cope match-plate pattern 1
Under, mold deadweight equilibrium effectively clamps prepreg tape, then recycles the powerful pressure of hot-press equipment in hot pressing to tiltedly
The effect in face, is fixed prepreg tape end, use first fixing after the mode of tabletting so that fiber in hot pressing not because of
The flowing of molten resin and produce bending and displacement, therefore, it is possible to give full play to the reinforced effects of fiber, by composite
Mechanical property.
Embodiment 2:
As shown in Figure 2, the mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel, including the most successively
Arrange the cope match-plate pattern 1 adapted, framed 2 and lower bolster 3, described cope match-plate pattern 1 near framed 2 one end and described lower bolster 3
It is provided with trapezoid boss 4 near one end of framed 2, the cross-sectional area of described trapezoid boss 4 cross-sectional area less than framed 2,
And the cross-sectional area of trapezoid boss 4 is gradually increased to the one end away from framed 2 by the one end near framed 2, described trapezoidal convex
The inclined-plane of platform 4 and the trapezoid boss 4 angle between the plane of framed 2 one end are between 135 °～165 °, on described framed 2
It is provided with the groove 5 adapted with trapezoid boss 4, in described groove 5, is provided with the die cavity 6 adapted with trapezoid boss 4.The present embodiment
Beneficial effect: be easy to same direction multilamellar gripping continuous fiber reinforced thermoplastic prepreg tape.
Embodiment 3:
As shown in Figure 3, the mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel, including the most successively
Arrange the cope match-plate pattern 1 adapted, framed 2 and lower bolster 3, described cope match-plate pattern 1 near framed 2 one end and described lower bolster 3
It is provided with trapezoid boss 4 near one end of framed 2, the cross-sectional area of described trapezoid boss 4 cross-sectional area less than framed 2,
And the cross-sectional area of trapezoid boss 4 is gradually increased to the one end away from framed 2, on described framed 2 by the one end near framed 2
It is provided with the groove 5 adapted with trapezoid boss, in described groove 5, is provided with the die cavity 6 adapted with trapezoid boss 4.Cope match-plate pattern 1,
Trapezoid boss 4 on lower bolster 3 is mutually perpendicular to, and the groove 5 on the downside of groove 5 and framed 2 on the upside of in the of the most framed 2 is the most vertical
Directly, the inclined-plane of described trapezoid boss 4 and the trapezoid boss 4 angle between the plane of framed 2 one end 135 °～165 ° it
Between.The beneficial effect of the present embodiment: be easy to both direction gripping continuous fiber reinforced thermoplastic prepreg tape.
Embodiment 4:
As shown in Figure 4, the mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel, including the most successively
The cope match-plate pattern 1 adapted, framed 2 and the lower bolster 3 arranged is cope match-plate pattern 1, framed 2 identical with the cross-sectional area of lower bolster 3.
Described cope match-plate pattern 1 is provided with truncated rectangular pyramids shape boss 4 near one end of framed 2, and the cross-sectional area of described truncated rectangular pyramids shape boss 4 is less than
The cross-sectional area of framed 2, the cross-sectional area of described truncated rectangular pyramids shape boss 4 by near framed 2 one end to away from framed 2 one
End is gradually increased, the inclined-plane of described truncated rectangular pyramids shape boss 4 and the truncated rectangular pyramids shape boss 4 angle between the plane of framed 2 one end
Degree is between 135 °～165 °.Described framed 2 are provided with the groove 5 adapted with truncated rectangular pyramids shape boss 4, set in described groove 5
Having the die cavity 6 adapted with truncated rectangular pyramids shape boss, the cross-sectional area of described die cavity 6 and truncated rectangular pyramids shape boss are away from framed 2 one
The cross-sectional area of end is identical, and the cross-sectional area of die cavity is 200 × 200mm2.The beneficial effect of the present embodiment: be easy to two
Direction gripping continuous fiber reinforced thermoplastic prepreg tape.
Embodiment 5:
As shown in Figure 5, the mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel, including the most successively
The cope match-plate pattern 1 adapted, framed 2 and the lower bolster 3 arranged, cope match-plate pattern 1, framed 2 and lower bolster 3 cross section are in the same size, institute
State cope match-plate pattern 1 near framed 2 one end and described lower bolster 3 be equipped with truncated rectangular pyramids shape boss 4 near one end of framed 2, described
The cross-sectional area of truncated rectangular pyramids shape boss 4 cross-sectional area less than framed 2, the cross-sectional area of described truncated rectangular pyramids shape boss 4
It is gradually increased to away from framed 2 one end by the one end near framed 2.The inclined-plane of described truncated rectangular pyramids shape boss 4 is convex with truncated rectangular pyramids shape
The platform 4 angle between the plane of framed 2 one end is between 135 °～165 °.Described framed 2 be provided with convex with truncated rectangular pyramids shape
The groove 5 that platform 4 adapts, is provided with the die cavity 6 adapted with truncated rectangular pyramids shape boss 4 in described groove 5, described die cavity 6 transversal
Face area is identical away from the cross-sectional area of framed 2 one end with truncated rectangular pyramids shape boss 4, and described die cavity 6 is square, and die cavity 6
Cross-sectional area be 200 × 200mm2.The corner of described die cavity 6, the corner of truncated rectangular pyramids shape boss 4 are rounding, described
The radius of rounding is 5 millimeters.The beneficial effect of the present embodiment: be easy to both direction gripping continuous fiber reinforced thermoplastic preimpregnation
Band.
Claims (9)
1. a mould for continuous fiber reinforced thermoplastic prepreg tape panel, including adapting of setting gradually from top to bottom
Cope match-plate pattern (1), framed (2) and lower bolster (3), it is characterised in that: described cope match-plate pattern (1) near the one end of framed (2) or/and institute
Stating lower bolster (3) and be provided with boss (4) near the one end of framed (2), the cross-sectional area of described boss (4) is less than framed (2)
Cross-sectional area, described framed (2) are provided with the groove (5) adapted with boss (4), and described groove is provided with and boss in (5)
(4) die cavity (6) adapted.
The mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel the most according to claim 1, is characterized in that: institute
The cross-sectional area stating boss (4) is gradually increased to away from framed (2) one end by the one end near framed (2).
The mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel the most according to claim 2, is characterized in that: institute
Stating boss (4) is trapezoid boss or truncated rectangular pyramids shape boss.
The mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel the most according to claim 3, is characterized in that: institute
State the angle between the inclined-plane of boss (4) and the plane of close framed (2) one end of boss (4) between 135 °～165 °.
The mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel the most according to claim 3, is characterized in that: institute
The cross-sectional area stating die cavity (6) is identical away from the cross-sectional area of framed (2) one end with truncated rectangular pyramids shape boss.
The mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel the most according to claim 1, is characterized in that: institute
State the corner of die cavity (6), the corner of boss (4) and be rounding.
The mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel the most according to claim 6, is characterized in that: institute
The radius stating rounding is 1 millimeter～5 millimeters.
The mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel the most according to claim 1, is characterized in that: institute
State die cavity (6) for square or rectangle.
The mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel the most according to claim 1, is characterized in that: institute
The cross-sectional area stating die cavity (6) is 200 × 200mm2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620783252.0U CN205800228U (en) | 2016-07-22 | 2016-07-22 | A kind of mould of continuous fiber reinforced thermoplastic prepreg tape panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620783252.0U CN205800228U (en) | 2016-07-22 | 2016-07-22 | A kind of mould of continuous fiber reinforced thermoplastic prepreg tape panel |
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| Publication Number | Publication Date |
|---|---|
| CN205800228U true CN205800228U (en) | 2016-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620783252.0U Active CN205800228U (en) | 2016-07-22 | 2016-07-22 | A kind of mould of continuous fiber reinforced thermoplastic prepreg tape panel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106142599A (en) * | 2016-07-22 | 2016-11-23 | 山东理工大学 | The mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel and forming method |
| CN107584750A (en) * | 2017-08-16 | 2018-01-16 | 柳州申通汽车科技有限公司 | A kind of heat pressing process of auto sound diaphragm |
-
2016
- 2016-07-22 CN CN201620783252.0U patent/CN205800228U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106142599A (en) * | 2016-07-22 | 2016-11-23 | 山东理工大学 | The mould of a kind of continuous fiber reinforced thermoplastic prepreg tape panel and forming method |
| CN107584750A (en) * | 2017-08-16 | 2018-01-16 | 柳州申通汽车科技有限公司 | A kind of heat pressing process of auto sound diaphragm |
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