CN106182804A - The mould of composite pipe and forming method - Google Patents

The mould of composite pipe and forming method Download PDF

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Publication number
CN106182804A
CN106182804A CN201610695604.1A CN201610695604A CN106182804A CN 106182804 A CN106182804 A CN 106182804A CN 201610695604 A CN201610695604 A CN 201610695604A CN 106182804 A CN106182804 A CN 106182804A
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CN
China
Prior art keywords
described
core
composite pipe
mould
outer mold
Prior art date
Application number
CN201610695604.1A
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Chinese (zh)
Inventor
郭金海
李世成
温凯
沈峰
刘扬
叶周军
荆怀靖
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上海复合材料科技有限公司
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Application filed by 上海复合材料科技有限公司 filed Critical 上海复合材料科技有限公司
Priority to CN201610695604.1A priority Critical patent/CN106182804A/en
Publication of CN106182804A publication Critical patent/CN106182804A/en

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Abstract

The invention provides mould and the forming method of a kind of composite pipe, described mould includes metal outer mold, core and is arranged on the attachment structure at metal outer mold two ends;Being provided with through hole in the middle of described metal outer mold, core is arranged in through hole;Described metal outer mold is made up of upper metal outer mold and lower metal outer mold;Described core includes core layer and is sheathed on the Nylon Bag film layer of core layer outer surface.Composite pipe prepared by forming method of the present invention, has lower production cost compared with traditional moulding process, higher internal soundness, and more preferable product thickness uniformity can be according to product design drawing requirement molding all kinds of shape pipe fitting.

Description

The mould of composite pipe and forming method

Technical field

The invention belongs to technical field of composite material molding, be specifically related to mould and the one-tenth of a kind of composite pipe Type method.

Background technology

Composite product has specific strength and specific modulus is high, designability is good, good insulation preformance, excellent chemically-resistant are rotten The features such as erosion, mainly in high-technology field application such as space flight and aviation, defence and military, industrial and high-end physical culture.Particularly with Field of aerospace, composite product, particularly composite pipe goods rise in the load-bearing truss of the aircraft such as satellite To the most important effect.

Composite pipe, in forming process, usually uses expansion, negative and positive group in vacuum bag-autoclave, silicone rubber Prepreg is implemented pressurization by the modes such as matched moulds, it is difficult to guarantee pressurization whole to prepreg, so be difficult to interiors of products defect with And product size uniformity control effectively, have a strong impact on composite products quality.Especially lead in aerospace applications Territory, interiors of products defect is required to conformance with standard GB2895 C level and more than, cause conforming product rate relatively low, significantly make About product is in light-weighted application processes of military industry field structural member such as space flight and aviation.

By finding the retrieval of prior art, Chinese patent CN101879738B discloses the making of composite pipe Method, this invention first uses and carries out laying pre-setting at internal stay mandrel, then extracts inner core out and be inserted into three-chip type active block Non-circular internal stay mandrel is by means of silicon flexible pipe extrusion forming, it is ensured that the manufacturing process stability of product.But the method for The overall dimensions of product controls to be difficult to ensure that, and mentioned internal stay needs two kinds of specifications and twice handling, and process is loaded down with trivial details.China Patent CN103213285B discloses a kind of variable cross-section and closes the forming method of chamber composite material element, and the method uses multiple pressurization Mode the composite material process planning deposited, prepared constant product quality model.But this inventive method needs preparation to produce The components such as product transition core, silicone rubber, relatively costly, molding procedure is loaded down with trivial details." low-angle is wound around rectangle composite to periodical literature The research of pipe " (fibrous composite, 2011,2,14-16) use Filament Winding Equipment to carry out fiber winding, and many to mould etc. Aspect is optimized prepares satisfactory rectangle rod member, but its Design of Dies and manufacture level, the required precision of equipment and There is certain restriction for the molding of composite pipe in the aspects such as work top, it is difficult to realizes the low cost of product, Gao Xing Can preparation.

Summary of the invention

For defect of the prior art, it is an object of the invention to provide mould and the one-tenth of a kind of composite pipe Type method.The present invention overlaps the core layer core as mould of Nylon Bag film, pressurized expansion molding in implementing using surface, has The solution existing forming composite pipe complex process of effect, mould processing cost height, production of articles cost high to equipment requirements Height, the weak points such as internal soundness is poor.

It is an object of the invention to be achieved through the following technical solutions:

The invention provides the mould of a kind of composite pipe, including metal outer mold, core be arranged on metal The attachment structure at external mold two ends;Being provided with through hole in the middle of described metal outer mold, core is arranged in through hole;Described metal outer mold by Upper metal outer mold and lower metal outer mold composition;Described core includes core layer and is sheathed on the Nylon Bag film layer of core surfaces.

Preferably, described Nylon Bag film layer is the bag film of tubular structure, and one end seals, and the other end connects inflating nozzle.Institute Stating sealing can use sealing joint strip to carry out.

Preferably, described bag film thickness is not less than 0.03mm, more preferably 0.03mm~0.15mm, and elongation percentage is not less than 150%, heatproof is not less than 80 DEG C, pressure is not less than 5MPa.

Preferably, the one during the material of described core layer includes foam core material, wooden core, steel core.

Preferably, described foam core material is expandable polystyrene foam (EPS) core, and density is 5g/cm3~ 50g/cm3

Preferably, described metal outer mold is to mould (half) structure.

Preferably, described shape of through holes is identical with core layer external surface shape, through-hole wall and core layer outer surface away from From the wall thickness for composite pipe.

Preferably, described shape of through holes and core layer external surface shape are designed according to the structure of pipe fitting and manufacture.

Preferably, described attachment structure includes front shroud and back shroud, front shroud respectively with upper metal outer mold and lower metal The side of external mold connects, and back shroud opposite side with upper metal outer mold and lower metal outer mold respectively is connected, described connected mode bag Include screw to connect;Being provided with the second through hole on described front shroud, inflating nozzle connects through the pipeline of the second through hole with compressed gas Connect.

Present invention also offers the forming method of a kind of composite pipe, described forming method is for using aforesaid molding Composite pipe prepared by mould, specifically includes following steps:

Laying step: by prepreg lay as requested in mandrel surface;

Matched moulds step: the core of prepreg puts into through hole, matched moulds by lay;

Curing schedule: be placed in curing apparatus by the mould after matched moulds and heat, inflating nozzle connects pressure simultaneously Contracting gas gives cure under pressure to Nylon Bag film layer;

Demoulding step: open metal outer mold after solidification, extracts core out, obtains described composite pipe.

Preferably, described prepreg includes fiber reinforced epoxy resin prepreg, fibre reinforced phenolic resin prepreg, fibre Dimension strengthens one or more in cyanate prepreg.

It is highly preferred that described fiber includes carbon fiber, glass fibre;More preferably carbon fiber is graphite fibre.

Preferably, one or more during described lay mode includes fiber winding, pipe crimping, manual laying.

Preferably, in curing schedule, described curing apparatus includes that hot press, autoclave, baking oven etc. can provide fire-bar The equipment of part.

Preferably, in curing schedule, described compressed gas includes compressed air, compressed nitrogen etc., and its pressure is not less than 0.1MPa。

Compared with prior art, the present invention has a following beneficial effect:

1, using composite pipe prepared by mould of the present invention, in product, profile is because of the inflation of Nylon Bag film And ensureing uniformity, the profile of product is ensured by metal outer mold, and then ensures the evenness of wall thickness of product.Use inner inflatable Expanding, air pressure is adjustable, and prepared tubing products internal soundness is good, can reach in GB2895 internal flaw C level and more than Requirement.Additionally, use expandable polystyrene foam as the core layer of molding core, in high temperature cure process, meeting is because being subject to Heat and be punctured into the solid of micro volume, be drawn out of together with Nylon Bag film layer, it is to avoid the generation of fifth wheel.

2, use the inventive method mould to prepare composite pipe, for same root pipe fitting, there is different-thickness, with And there is the pipe fitting of odd-shaped cross section or labyrinth all can be with disposal molding, manufacturability exploitativeness is strong, and product quality is steady Qualitative good.

3, mould of the present invention is used to prepare composite pipe, for the equipment such as fiber winding machine, rolling machine without by force Sexual demand processed, reduces the equipment investment in production process.

Accompanying drawing explanation

By the detailed description non-limiting example made with reference to the following drawings of reading, the further feature of the present invention, Purpose and advantage will become more apparent upon:

Fig. 1 is the schematic diagram of mould of the present invention;

Fig. 2 is the core mold structure schematic diagram of mould of the present invention;

Wherein: the upper metal outer mold of 1-;Metal outer mold under 2-;3-core;4-front shroud;5-back shroud;6-core layer;7-Buddhist nun Dragon bag film layer.

Detailed description of the invention

Below in conjunction with specific embodiment, the present invention is described in detail.Following example will assist in the technology of this area Personnel are further appreciated by the present invention, but limit the present invention the most in any form.It should be pointed out that, the ordinary skill to this area For personnel, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement.These broadly fall into the present invention Protection domain.

Embodiment 1

Present embodiments provide the mould of a kind of composite pipe, as depicted in figs. 1 and 2, including metal outer mold, Core 3 and the attachment structure being arranged on metal outer mold two ends;Being provided with through hole in the middle of described metal outer mold, core is arranged on through hole In;Described metal outer mold is made up of upper metal outer mold 1 and lower metal outer mold 2;Described core includes core layer 6 and is sheathed on core The Nylon Bag film layer 7 of layer outer surface.

Described Nylon Bag film layer 7 is the bag film of tubular structure, and one end seals, and the other end connects inflating nozzle.

Described bag film thickness is 0.03mm~0.15mm, and elongation percentage is not less than 150%, and heatproof is not less than 80 DEG C, pressure not Less than 5MPa.

Described core layer 6 is expandable polystyrene foam (EPS) core layer.

The density of described expandable polystyrene foam is 5g/cm3~50g/cm3

Described metal outer mold is to mode structure.

Described shape of through holes is identical with core layer 6 external surface shape, and through-hole wall is multiple with the distance of core layer outer surface The wall thickness of condensation material pipe fitting.

Described shape of through holes and core layer 6 external surface shape are designed according to the structure of pipe fitting and manufacture.

Described attachment structure includes front shroud 4 and back shroud 5, front shroud 4 respectively with upper metal outer mold 1 and lower metal outer mold The side of 2 connects, and back shroud 5 opposite side with upper metal outer mold 1 and lower metal outer mold 2 respectively is connected, described connected mode bag Include screw to connect.

Being provided with the second through hole on described front shroud 4, inflating nozzle is connected through the second through hole with the pipeline of compressed gas.

The present embodiment further relates to the forming method of a kind of composite pipe, uses the preimpregnation of carbon fiber epoxy hot melt The exemplary complex material round bar of internal diameter 40mm, wall thickness 2mm prepared by material.Comprise the concrete steps that:

(1) the polystyrene foam cylinder core sheet material layers that external diameter is 40mm (-0.05mm ,-0.02mm) is prepared;

(2) using internal diameter is 40mm (-0.05mm, 0mm), and thickness is that the Nylon Bag film 7 of 0.05mm is sleeved on polystyrene Foam cylinder core layer outer surface forms core 3;

(3) thickness in monolayer 0.2mm, surface density 200g/m are used2Carbon fiber epoxy hot melt prepreg at core 3 On carry out laying, ply stacking-sequence is [0/90/+45/-45/0] s, and the number of plies is 10 layers;

(4) being sealed Nylon Bag film layer 7 one end, one end connects inflating nozzle;

(5) above-mentioned blank is placed in mold cavity and matched moulds is fixed;

(6) mould installing blank being placed in hot press, inflating nozzle is connected with compressed air;

(7) according to 80 DEG C 1 hour+130 DEG C 3 hours, pressure is that the curing cycle of 0.5MPa carries out product curing molding;

(8) after being cooled to room temperature, the demoulding, repair burr, obtain composite round bar.

The composite round bar that the present embodiment prepares, after tested, wall thickness 2mm (+0.05mm ,-0.03mm), flaw detection meets C level requirement in GB2895, fully meets the performance indications of the structural members such as China's aerospace model.

Composite round bar prepared by the present embodiment, compared with the process such as traditional fibre winding, not only reduces compound The manufacturing cost of material molds and the restriction of equipment, and achieve material in terms of evenness of wall thickness, internal quality control It is obviously improved.

Embodiment 2

Present embodiments provide mould and the forming method of a kind of composite pipe, with the difference of embodiment 1 It is: the cross sectional shape of prepared composite pipe is pentagon, prepared polystyrene foam core sheet material layers cross sectional shape Also being pentagon, other mould structures, mould molding step and parameter are same as in Example 1.Gained composite pentagon pipe The wall thickness of part is 2mm (0mm ,-0.05mm), and flaw detection meets A level requirement in GB2895.

In sum, compound for meeting in the high-technology fields such as space flight and aviation, defence and military, industrial and high-end physical culture The application demand of material pipe fitting high quality and low cost, the present invention, through great many of experiments, uses Nylon Bag Membrane cover to be contained in polystyrene Foams form core 3, and prepreg overlay is placed in the mould of half structure behind core 3 surface, expand through internal pressurising Molding.Through lot of experiments checking and actual application, the composite pipe using the method to prepare, there is more conventional molding work The production cost that skill is lower, higher internal soundness, more preferable product thickness uniformity, can become according to product design drawing requirement Type all kinds of shape pipe fitting.Domestic there is no pertinent literature and patent report so far.

The concrete application approach of the present invention is a lot, and the above is only the preferred embodiment of the present invention.It should be pointed out that, above Embodiment is merely to illustrate the present invention, and is not limited to protection scope of the present invention.Common skill for the art For art personnel, under the premise without departing from the principles of the invention, it is also possible to make some improvement, these improvement also should be regarded as this Bright protection domain.

Claims (10)

1. the mould of a composite pipe, it is characterised in that include metal outer mold, core and be arranged on metal outer mold The attachment structure at two ends;Being provided with through hole in the middle of described metal outer mold, core is arranged in through hole;Described metal outer mold is by upper gold Belong to external mold and lower metal outer mold composition;Described core includes core layer and is sheathed on the Nylon Bag film layer of core layer outer surface.
2. the mould of composite pipe as claimed in claim 1, it is characterised in that described Nylon Bag film layer is tubulose The bag film of structure, one end seals, and the other end connects inflating nozzle.
3. the mould of composite pipe as claimed in claim 2, it is characterised in that described bag film thickness is 0.03mm ~0.15mm, elongation percentage is not less than 150%, and heatproof is not less than 80 DEG C, pressure is not less than 5MPa.
4. the mould of composite pipe as claimed in claim 1, it is characterised in that the material of described core layer includes One in foam core material, wooden core, steel core.
5. the mould of composite pipe as claimed in claim 4, it is characterised in that described foam core material is expandability Polystyrene foam core material, density is 5g/cm3~50g/cm3
6. the mould of composite pipe as claimed in claim 1, it is characterised in that described shape of through holes and core layer External surface shape is identical, through-hole wall and the wall thickness that distance is composite pipe of core layer outer surface.
7. the mould of composite pipe as claimed in claim 1, it is characterised in that described attachment structure includes protecgulum Plate and back shroud, front shroud is provided with the second through hole, and inflating nozzle is connected through the second through hole with the pipeline of compressed gas.
8. the forming method of a composite pipe, it is characterised in that described forming method is for using claim 1-7 arbitrary Composite pipe prepared by mould described in Xiang, specifically includes following steps:
Laying step: by prepreg lay as requested in mandrel surface;
Matched moulds step: the core of prepreg puts into through hole, matched moulds by lay;
Curing schedule: be placed in curing apparatus by the mould after matched moulds and heat, inflating nozzle connects compressed gas simultaneously Body gives cure under pressure to Nylon Bag film layer;
Demoulding step: open metal outer mold after solidification, extracts core out, obtains described composite pipe.
9. the forming method of composite pipe as claimed in claim 8, it is characterised in that described prepreg includes that fiber increases One or more in strong epoxy prepreg, fibre reinforced phenolic resin prepreg, fiber reinforcement cyanate prepreg.
10. the forming method of composite pipe as claimed in claim 8, it is characterised in that described lay mode includes fibre One or more in dimension winding, pipe crimping, manual laying.
CN201610695604.1A 2016-08-19 2016-08-19 The mould of composite pipe and forming method CN106182804A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106553357A (en) * 2016-11-09 2017-04-05 江苏恒神股份有限公司 Hollow multi-cavity abnormal shape surface composite material complex structural member integral forming technique
CN108115948A (en) * 2017-12-26 2018-06-05 天津工业大学 A kind of composite material shaping core and preparation method
CN108858911A (en) * 2018-05-03 2018-11-23 威海光威复合材料股份有限公司 A kind of 120 DEG C of lumen type mandrel molding methods
CN109466091A (en) * 2018-07-17 2019-03-15 广州市勇源冰雪运动用品有限公司 A kind of preparation method and ice stick of ice stick
WO2020037798A1 (en) * 2018-08-24 2020-02-27 深圳市美好创亿医疗科技有限公司 Hot-press processing mould and threaded hose hot-press coated by textile layer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105128361A (en) * 2015-08-03 2015-12-09 哈瓦国际航空技术(深圳)有限公司 Production technology of carbon fiber composite aircraft
CN105346099A (en) * 2015-10-29 2016-02-24 西安康本材料有限公司 Preparing method of carbon fiber composite thin-wall curve pipe
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105128361A (en) * 2015-08-03 2015-12-09 哈瓦国际航空技术(深圳)有限公司 Production technology of carbon fiber composite aircraft
CN105346099A (en) * 2015-10-29 2016-02-24 西安康本材料有限公司 Preparing method of carbon fiber composite thin-wall curve pipe
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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106553357A (en) * 2016-11-09 2017-04-05 江苏恒神股份有限公司 Hollow multi-cavity abnormal shape surface composite material complex structural member integral forming technique
CN108115948A (en) * 2017-12-26 2018-06-05 天津工业大学 A kind of composite material shaping core and preparation method
CN108858911A (en) * 2018-05-03 2018-11-23 威海光威复合材料股份有限公司 A kind of 120 DEG C of lumen type mandrel molding methods
CN109466091A (en) * 2018-07-17 2019-03-15 广州市勇源冰雪运动用品有限公司 A kind of preparation method and ice stick of ice stick
WO2020037798A1 (en) * 2018-08-24 2020-02-27 深圳市美好创亿医疗科技有限公司 Hot-press processing mould and threaded hose hot-press coated by textile layer

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Application publication date: 20161207