CN107139359A - Compression molding die with the composite product for extending laterally cavity - Google Patents
Compression molding die with the composite product for extending laterally cavity Download PDFInfo
- Publication number
- CN107139359A CN107139359A CN201710519068.4A CN201710519068A CN107139359A CN 107139359 A CN107139359 A CN 107139359A CN 201710519068 A CN201710519068 A CN 201710519068A CN 107139359 A CN107139359 A CN 107139359A
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- CN
- China
- Prior art keywords
- core
- composite product
- die
- compression molding
- cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/345—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using matched moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention belongs to composites processing technology field.Forming die structure for moulding is used for reference, using side core-pulling technology, by the core and core pulling component put in being fixed on, realizes that product molding and core are extracted.Compression molding die of the present invention with the composite product for extending laterally cavity, including upper die and lower die, middle set, core component and ejecting mechanism, upper die and lower die and middle set surround die cavity, core component is laterally through middle set, middle set is made up of the ring set (5) and briquetting (6) of preset-groove (4), and groove and the involutory surface of briquetting and the die joint of mandrel are coplanar and are matched with core positioning section (3)；Core component includes mandrel and location structure with core (7), core positioning section (3) and core pulling section (8).The mould designability is strong, is easy to the dismounting of core and is accurately positioned.It is suitable for the hollow structure laminar composite product molding along extension cavity between prepreg.
Description
Technical field
The invention belongs to composites processing technology field, it is related to composite product hot extrusion briquetting technique, more particularly to
Hollow structure composite product mould designing technique.
Background technology
At present, the preparation key of hollow composite material structural member laminated into type is its moulding process, mainly there is three kinds：
First, formpiston/hot pressing bag forming, laying operation is easy, and vacuum sealing bag pressure is convenient, and external mass uniformity is not
Good, the damage that surface post-processes to reinforcing fiber can not be repaired；
Second, former/air bag mandrel molding, outer surface quality is easily guaranteed that, but briquetting pressure is less than normal, is not suitable for small-sized
Product；
3rd, open former, silicon rubber mould mainly plays pressure, and solidifying pressure derives from external pressure source, this technique
It is very perfect in theory, but in order to reach preferable inner structure size, it is necessary to carry out strict turgor pressure to silicon rubber core
The control of power, and the use of silicon rubber core can greatly increase the cost of frock, often be difficult to reach reason in actual applications
Think effect.
The content of the invention
It is applied to it is an object of the invention to provide a kind of with the laminar composite product for extending laterally cavity structure
Mould, solve along the hollow structure composite laminated article extended between prepreg shaping.
The object of the present invention is achieved like this, uses for reference moulding compound heat pressing and molding mold die cavity and demolding structure, utilizes side
Core pulling technology, by the core and the external core pulling component of matching put in being fixed on, is not changing laminar composite shaping
While technique, realize that the shaping along the hollow structure composite laminated article extended between prepreg and core are extracted.
It is of the present invention have extend laterally cavity composite product compression molding die, including upper mould 1, under
Mould 2, middle set, core component and ejecting mechanism, upper mould 1, lower mould 2 and middle set surround die cavity, it is characterised in that：Core component is lateral
Through middle set, middle set is made up of the ring set 5 and briquetting 6 of preset-groove 4, the involutory surface and the die joint of mandrel of groove 4 and briquetting 6
It is coplanar and matched with core positioning section 3；Core component includes with core 7, the mandrel of core positioning section 3 and core pulling section 8 and determined
Bit architecture, as shown in Figure 1, middle set and mandrel combining structure are as shown in Figure 2 for mould structure.
It is of the present invention have extend laterally cavity composite product compression molding die, including upper mould, in
Set, lower mould, core component and ejecting mechanism, upper die and lower die and middle set surround die cavity, and core component is laterally through middle set, and it is special
Levy and be：Briquetting 6 and matching grooves positive stop lug boss 9.
It is of the present invention have extend laterally cavity composite product compression molding die, including upper mould 1, under
Mould 2, middle set, core component and ejecting mechanism, upper mould 1, lower mould 2 and middle set surround die cavity, it is characterised in that：Core component is lateral
Through middle set, middle set is made up of the integrated positioning block 11 of the ring set 5 of preset rectangular recess 10 and a pair and matching grooves, and combination is calmly
The die joint of the preset through hole matched with core positioning section 3 on the block 11 of position, involutory surface and mandrel is coplanar；Core component includes having
The mandrel and location structure of core 7, core positioning section 3 and core pulling section 8, the combining structure such as accompanying drawing 3 of middle set and core positioning section 3
It is shown.
Compression molding die of the present invention with the composite product for extending laterally cavity, it is characterised in that：
It is consistent with the bearing of trend of core with the through hole matched of core positioning section 3 on integrated positioning block 11.
Compression molding die of the present invention with the composite product for extending laterally cavity, it is characterised in that：
Integrated positioning block 11 and matching grooves spacer pin 12, structure is as shown in Figure 5.
Compression molding die of the present invention with the composite product for extending laterally cavity, it is characterised in that：
Also include the side plate 13 with symmetrical screw 14, side plate is connected with core pulling 8 fixed Combinations of section, and screw hole is symmetrical arranged on side plate 13,
Screw rod 14 is inserted in screw hole.
Compression molding die of the present invention with the composite product for extending laterally cavity, it is characterised in that：
Side plate 13 is fastened by bolts with middle set.
Compression molding die of the present invention with the composite product for extending laterally cavity, it is characterised in that：
The quantity of core is no more than 10.
Compression molding die of the present invention with the composite product for extending laterally cavity, it is characterised in that：
The extraction direction of different cores is independent of one another.
The mould of hollow structure laminar composite product of the present invention, can be achieved hollow structure composite
The accurate control of the integrated molding of product；Designability is strong, and the design of core structure is strong, is easy to the dismounting of core and accurate
Positioning.It is suitable for, with along the hollow structure laminar composite product molding for extending cavity between prepreg, being particularly suitable for use in
There is the hollow structure laminar composite product molding of exquisite outer surface and exquisite hollow interior surface simultaneously.
Brief description of the drawings
Fig. 1 forming die structure for moulding schematic diagrames of the present invention with the composite product for extending laterally cavity
A kind of middle noose of Fig. 2 compression molding dies of the present invention with the composite product for extending laterally cavity
Structure schematic diagram
Another middle set of Fig. 3 compression molding dies of the present invention with the composite product for extending laterally cavity
Structural representation
Fig. 4 present invention and the core shaft structure of compression molding die with the composite product for extending laterally cavity show
It is intended to
Fig. 5 another forming die structure for moulding with the composite product for extending laterally cavity of the present invention
Schematic diagram
In Fig. 6 another compression molding dies with the composite product for extending laterally cavity of the present invention
Nested structure schematic diagram
Mould under the upper moulds of 1-, 2-, 3- core positioning sections, 4- grooves, 5- ring sets, 6- briquettings, 7- cores, 8- core pullings section, 9- limits
Position boss, 10- rectangular recess, 11- integrated positioning blocks, 12- spacer pins, 13- side plates, 14- screw rods, 15- locating slots, 16- boss,
17- rectangular channels, 18- locating slots
Embodiment
The specific embodiment of the invention is further described below in conjunction with the accompanying drawings, but it is not as a limitation of the invention.
In the description below, special characteristic, structure or feature in one or more embodiments can be combined by any suitable form.
Embodiment 1
Symmetrical with a kind of thickness direction, projection structure is 500mm*150mm, thickness 15mm, with prolonging along between prepreg
Exemplified by the φ 10 that stretches, the laminar composite product of long 350mm cylindrical cavity, its heat pressing and molding mold includes upper mould, band
There are middle set, lower mould, core component and guide pillar and the ejecting mechanism of core location structure, upper mould, middle set and lower mould surround die cavity, in
Height 40mm is covered, die cavity, guide pillar and ejecting mechanism are conventional design (summary), and as shown in Figure 1, core component is with for mould structure
As shown in Figure 2, core modular construction is as shown in Figure 4 for the combining structure of set.
Core component includes core, core positioning section and core pulling section, overall length 450mm, 0.1 ° of core draft angle, core positioning
Section 3 sets detent 15, and core pulling section sets the hanging hole being connected with external force.
Middle set opens up opening up and laterally through middle set high 20mm, the ring set 5 of wide 20mm rectangular recess 4 by side
Constituted with the briquetting 6 of matching, groove is symmetrical arranged φ 10 semicircle slit-like through-holes and core positioning section 3 with briquetting involutory surface
Match somebody with somebody, the boss 16 matched with the locating slot 15 on core positioning section 3 is provided with briquetting；By inlaying between groove and briquetting
Form longitudinally coordinates positioning.
In use, routinely combining upper and lower mould and middle set, the composite stacking module below die joint is laid；Core group
Part is in place, and is pressed into briquetting；Lay composite stacking module more than die joint；Matched moulds, heating extrusion forming.Die sinking
Afterwards, briquetting is taken out, core is then extracted out by external force, passes through ejecting mechanism ejecting product.
Embodiment 2
Another mould structure of the like products of embodiment one, mould structure as shown in Figure 1, core component and middle set
Combining structure is as shown in Figure 5.
Core component includes side plate 13, core, core positioning section and core pulling section, core pulling section and the vertical fixed Combination of side plate 13
It is integrated, the position on side plate corresponding to middle set M10 screwed hole sets a pair of φ 11mm through hole to be used for the installation with middle set,
A pair of M14 of setting screwed hole and the screw rod 14 of matching are used for core pulling simultaneously.
Ring set side opens up high 30mm, wide 20mm rectangular recess 10 opening up and that laterally run through middle set, and preset
Rectangular channel 17；The integrated positioning block 11 of a pair of matchings is high 30mm, width 20mm, long 60mm rectangle, and die joint is apart from upper surface
20mm, and symmetrically open up at die joint φ 10mm semicircle slit-like through-holes and matched with core positioning section 3, integrated positioning block 11
The position that is matched with rectangular channel 17 of side triangle locating slot 18 is set；Configuring a pair is used for rectangular channel 17 and integrated positioning block
The pin 12 of 11 matchings；The screwed hole that groove both sides 50mm is symmetrical arranged a pair of M10 along die joint is used for the installation of core component.
In use, combination and material lay of the upper and lower mould with middle set are identical with embodiment one.Difference is to combine
The rectangular recess covered in the latter half insertion of locating piece, inserts the pin of matching, is put into after core component, place into combination fixed
The top half of position block.After die sinking, pin is first taken out, the connecting bolt of side plate and mould is taken apart, screw rod exerts a force simultaneously, extraction type
Core.
Embodiment 3
By 600mm*120mm of a kind of projection structure, maximum gauge 20mm, it is identical and along prepreg with extraction direction
Between extend φ 15, long 260mm cylindrical cavity and major axis 30mm, short axle 10mm, the lamination of long 255mm oblong cavity
Exemplified by composite product, its heat pressing and molding mold includes upper mould, the middle set with core location structure, lower mould, core component
And guide pillar and ejecting mechanism, upper mould, middle set and lower mould surround die cavity, and middle set is highly 50mm, and die cavity, guide pillar and ejecting mechanism are
The combining structure of conventional design (summary), core positioning section 3 and middle set is as shown in Figure 6.
Middle set by side open up it is opening up and laterally through the high 25mm of middle set, the ring set of wide 80mm groove 4 and
The briquetting 6 matched somebody with somebody is constituted, and groove sets the circular and ellipse that the core positioning section with two mandrels is matched with briquetting involutory surface respectively
Shape through hole；Briquetting is coordinated by pin and groove to be positioned.
Core component includes two parallel mandrels, and fixed Combination vertical with side plate is integrated core positioning section respectively.
Remaining structure be the same as Example two.
In use, routinely combining upper and lower mould and middle set, the composite stacking module below die joint is laid；Core group
Part is in place, and is pressed into briquetting and is inserted pin；Lay composite stacking module more than die joint, matched moulds, heating pressurization
Shaping.After die sinking, the connecting bolt of side plate and mould is taken apart, screw rod exerts a force simultaneously, extract core out.
Claims (9)
1. it is a kind of have extend laterally cavity composite product compression molding die, including upper mould (1), lower mould (2), in
Set, core component and ejecting mechanism, upper die and lower die and middle set surround die cavity, it is characterised in that：Core component is laterally through in
Set, middle set is made up of the ring set (5) and briquetting (6) of preset-groove (4), groove (4) and the involutory surface of briquetting (6) and point of mandrel
Type face is coplanar and is matched with core positioning section (3)；Core component is included with core (7), core positioning section (3) and core pulling section
(8) mandrel and location structure.
2. the compression molding die according to claim 1 with the composite product for extending laterally cavity, its feature
It is：Briquetting (6) and matching grooves positive stop lug boss (9).
3. the compression molding die according to claim 1 with the composite product for extending laterally cavity, its feature
It is：Middle set is made up of the integrated positioning block (11) of the ring set (5) of preset rectangular recess (10) and a pair and matching grooves, combination
The die joint of the preset through hole matched with core positioning section (3) on locating piece (11), involutory surface and mandrel is coplanar.
4. the compression molding die according to claim 3 with the composite product for extending laterally cavity, its feature
It is：It is consistent with the bearing of trend of core with core positioning section (3) through hole matched on integrated positioning block (11).
5. the compression molding die with the composite product for extending laterally cavity according to claim 3 or 4, it is special
Levy and be：Integrated positioning block (11) and matching grooves spacer pin (12).
6. the compression molding with the composite product for extending laterally cavity according to Claims 1 to 4 any one
Mould, it is characterised in that：Also include the side plate (13) with symmetrical screw (14), side plate is connected with core pulling section (8) fixed Combination, side
Screw hole is symmetrical arranged on plate (13), screw rod (14) is inserted in screw hole.
7. the compression molding die according to claim 6 with the composite product for extending laterally cavity, its feature
It is：Side plate (13) is fastened by bolts with middle set.
8. the compression molding with the composite product for extending laterally cavity according to Claims 1 to 4 any one
Mould, it is characterised in that：The quantity of core is no more than 10.
9. the compression molding with the composite product for extending laterally cavity according to Claims 1 to 4 any one
Mould, it is characterised in that：The extraction direction of different cores is independent of one another.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710519068.4A CN107139359A (en) | 2017-06-30 | 2017-06-30 | Compression molding die with the composite product for extending laterally cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710519068.4A CN107139359A (en) | 2017-06-30 | 2017-06-30 | Compression molding die with the composite product for extending laterally cavity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107139359A true CN107139359A (en) | 2017-09-08 |
Family
ID=59785299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710519068.4A Pending CN107139359A (en) | 2017-06-30 | 2017-06-30 | Compression molding die with the composite product for extending laterally cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107139359A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107901455A (en) * | 2017-12-20 | 2018-04-13 | 菲舍尔航空部件（镇江）有限公司 | The hot press core transmission device of forming composite |
| CN109228131A (en) * | 2018-11-01 | 2019-01-18 | 福建亚通新材料科技股份有限公司 | A kind of compound core pipe core pulling molding device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1375406A (en) * | 2001-02-13 | 2002-10-23 | 坎培诺洛有限公司 | Method for manufacturing bicycle hub and apparatus therefor and hub obtained therefrom |
| CN205238597U (en) * | 2015-11-30 | 2016-05-18 | 南京航空航天大学 | Forming die of fiber reinforced resin based composite material pipe |
| CN205326106U (en) * | 2016-02-03 | 2016-06-22 | 晋江至诚模具有限公司 | Yoga post forming die |
| CN205610125U (en) * | 2016-04-13 | 2016-09-28 | 江苏天御海工新材料科技有限公司 | Novel fast loading and unloading cable duct |
| CN106182804A (en) * | 2016-08-19 | 2016-12-07 | 上海复合材料科技有限公司 | The mould of composite pipe and forming method |
| CN205900811U (en) * | 2016-07-06 | 2017-01-18 | 乐清凯森电器科技有限公司 | Take over waterproof terminal in pyrocondensation of high tensile soldering tin ring |
| CN106363942A (en) * | 2016-08-26 | 2017-02-01 | 清华大学 | Aviation special-shaped fabric rubber seal part mold and one-time molding method thereof |
| CN206899587U (en) * | 2017-06-30 | 2018-01-19 | 山东非金属材料研究所 | Compression molding die with the composite product for extending laterally cavity |
-
2017
- 2017-06-30 CN CN201710519068.4A patent/CN107139359A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1375406A (en) * | 2001-02-13 | 2002-10-23 | 坎培诺洛有限公司 | Method for manufacturing bicycle hub and apparatus therefor and hub obtained therefrom |
| CN205238597U (en) * | 2015-11-30 | 2016-05-18 | 南京航空航天大学 | Forming die of fiber reinforced resin based composite material pipe |
| CN205326106U (en) * | 2016-02-03 | 2016-06-22 | 晋江至诚模具有限公司 | Yoga post forming die |
| CN205610125U (en) * | 2016-04-13 | 2016-09-28 | 江苏天御海工新材料科技有限公司 | Novel fast loading and unloading cable duct |
| CN205900811U (en) * | 2016-07-06 | 2017-01-18 | 乐清凯森电器科技有限公司 | Take over waterproof terminal in pyrocondensation of high tensile soldering tin ring |
| CN106182804A (en) * | 2016-08-19 | 2016-12-07 | 上海复合材料科技有限公司 | The mould of composite pipe and forming method |
| CN106363942A (en) * | 2016-08-26 | 2017-02-01 | 清华大学 | Aviation special-shaped fabric rubber seal part mold and one-time molding method thereof |
| CN206899587U (en) * | 2017-06-30 | 2018-01-19 | 山东非金属材料研究所 | Compression molding die with the composite product for extending laterally cavity |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107901455A (en) * | 2017-12-20 | 2018-04-13 | 菲舍尔航空部件（镇江）有限公司 | The hot press core transmission device of forming composite |
| CN107901455B (en) * | 2017-12-20 | 2024-04-09 | 菲舍尔航空部件（镇江）有限公司 | Hot press mandrel conveying device for forming composite material |
| CN109228131A (en) * | 2018-11-01 | 2019-01-18 | 福建亚通新材料科技股份有限公司 | A kind of compound core pipe core pulling molding device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20170908 |