CN201856381U

CN201856381U - Compression molding die for prepreg

Info

Publication number: CN201856381U
Application number: CN2010206051269U
Authority: CN
Inventors: 朱家强; 王滨; 罗剑岚
Original assignee: SHANGHAI CEDAR COMPOSITES TECHNOLOGY Co Ltd
Current assignee: Shanghai Jin Fei Polytron Technologies Inc.
Priority date: 2010-11-15
Filing date: 2010-11-15
Publication date: 2011-06-08
Anticipated expiration: 2020-11-15

Abstract

The utility model relates to a compression molding die for prepreg, which comprises an upper die at the upper part, a lower die at the lower part and a middle core die and is characterized in that the core die is a silicone rubber die, wherein the silicone rubber die is of a hollow silicone rubber air bag structure. The compression molding die for the prepreg is used for various composite material products with complex and ingenious structures. The silicone rubber die is nondeformable, has high temperature resistance and acid and alkaline resistance and can be used repeatedly; in addition, the silicone rubber die has low cost and low shrinkage rate and is easy to demould. The molded composite material products have better interlayer combination at the lateral sides and have more attractive appearance.

Description

Prepreg compression molding mould

Technical field

The utility model relates to a kind of mould, refers in particular to a kind of mould that is used for the prepreg compression molding.

Background technology

Compare with traditional metal material, composite has the performance of numerous excellences, for example light weight, specific strength height, good dimensional stability, outstanding chemical stability etc., these good performances make its range of application extensive all the more, it is ripe that manufacture craft also is tending towards.Different according to product final use and structure, many composite material process plannings that arisen at the historic moment wherein just comprise and adopt the prepreg die press technology for forming to carry out the method that composite is made; When using existing shaping steel die to make the composite product of some curved surface labyrinths, the interlayer adhesion that the side can occur also has the heavy problems such as carrying and cost height that are difficult for of punching block simultaneously obviously not as interlayer adhesion, the not good defective of appearance of top and bottom.

The utility model content

Technical problem to be solved in the utility model is to provide a kind of prepreg compression molding mould, and this mould uses light, adopts the composite of this mould made to have good interlayer adhesion and surface of good outward appearance.

Its technical problem to be solved can be implemented by the following technical programs.

A kind of prepreg compression molding mould comprises the patrix on top, the counterdie and the middle core of bottom, and its characteristics are that described core is a silica gel mould.

As the further improvement of the technical program, the silica gel airbag structure that described silica gel mould is a hollow.

As the further improvement of the technical program, described silica gel air bag has a valve; This valve connects the air chamber and the space outerpace of air bag, can carry out air pressure adjustment by this valve, so that the surface of silica gel air bag changes to the pressure of intending forming composite.

The prepreg compression molding mould that adopts technique scheme mainly is the moulding of making complex structure, meticulous composite in order to solve, improves institute's moulding material outward appearance, strengthens the mechanical property of product.

Because silica gel has excellent flowability, good operability, plasticity is good, can be used for the composite product of various complex structures, exquisiteness; Silica gel modular invariance shape, high temperature resistant, acid and alkali-resistance, can use repeatedly, reduce cost; And the demoulding easily, shrinkage factor is little.During the prepreg compression molding, the silica gel air bag as on the prepreg overlay in the core inner bag placement die cavity, is carried out internal pressurization by air valve device during moulding, make composite material forming.Because the particularity of air pressure, the pressure that material is subjected on all directions is even, and the interlayer of composite product side is in conjunction with just relatively good.The dilatancy of silica gel makes when it is heated simultaneously, expands evenly, and the composite products of being done can access better outward appearance.

Description of drawings

Below in conjunction with accompanying drawing the specific embodiment of the present utility model being done one describes in detail.

Fig. 1 is the STRUCTURE DECOMPOSITION schematic diagram of preparation the utility model silica gel mould;

Fig. 2 is the utility model STRUCTURE DECOMPOSITION schematic diagram;

---mold 12---silica gel sheath 13---is gone up core among the figure: 11,21

14---following

core

15,25---bed die 22---prepreg products

24---air valve device.

The specific embodiment

Prepreg compression molding mould as depicted in figs. 1 and 2 mainly constitutes by mold 21, bed die 25 and as the silica gel sheath 12 of core; Wherein silica gel sheath 12 is air sac type structures of a hollow, lays air valve device 24 in the one side.Silica gel sheath 12 wherein can adopt that core 13 and following core 14 are prepared from mold 11, bed die 15 and the metalwork.Concrete silica gel is molded to be equipped with process and to use this mould to carry out process and method that the prepreg compression molding prepares composite and can be elaborated by the operating procedure of a following concrete embodiment.

The first step, the preparation of silica gel air bag:

Carry out preparation before the making earlier, comprise the raw material preparation, solid silicone is cut into the specification that needs, the metalwork core is prepared; Mould is prepared, cleaning mould, board preheating etc.

During making, play one deck releasing agent with the demoulding smoothly after guaranteeing formed product at the die surface of preheating earlier.The solid silicone that cuts is laid in up and down in the

mould

11 and 15, with metalwork core 13 up and down and 14 by the fixed thickness of required silica gel air bag in mould, put into the vulcanizer pressurization of heating behind the matched moulds, after the cooling its demoulding is taken out, the one side of reserving at silica gel sheath 12 is loaded onto air valve device 24 at last.Because silica gel has excellent flowability, good operability, plasticity is good; Therefore can well go out the model of various complex structures, exquisiteness according to the simulating shape of mould, be convenient to follow-up multiple section product moulding.

That is to say in the inner bag mould, solid silicone is up and down being spread layer by design in the mould respectively, on the silica gel of bed die, place the metalwork that matches as core, the matched moulds extrusion forming.The silica gel air bag of wherein making moulding can recycle.And in the preparation of silica gel air bag, core 13 and following core 14 play control silica gel balloon thickness on the used metalwork, and be two-layer about being divided into, and middle altogether is hollow-core construction, and its purpose is weight reduction.

Second step, the preformed of prepreg:

Same carry out previous preparation: prepreg product 22 is cut into the specification that needs; Mould is prepared, cleaning mould, board, mould and die preheating; Play releasing agent on the

mould

21 and 25 up and down, pressing the design shop layer of product.

The 3rd step, the curing molding of composite:

Be positioned in the bed die 25 by dimensional standard after the silica gel air bag that has disposed valve smeared releasing agent, the matched moulds extrusion forming of heating, the final cooling back demoulding is taken out.This moulding process has utilized the characteristics of gas---and flowability, diffusivity and isotropism, the gas in the silica gel air bag make on the composite products all directions stressed even, and the interlayer of each side and top and bottom is in conjunction with also reaching consistent substantially.And silica gel is under high-temperature condition, and expanded by heating is comparatively even, so the product surface outward appearance is improved.

Promptly in mould, by design shop layer, the silica gel air bag is placed on it as inner bag, the matched moulds extrusion forming with prepreg.

The silica gel air bag that the utility model provides is assisted prepreg compression molding mould, be that solid silicone is spread layer by the ply sequence of design in advance on counterdie, according to difform silica gel air bag, required metal derby is placed on the silica gel, carry out identical operations at upper cavity.With the upper and lower mould matched moulds, the extrusion forming of heating on vulcanizer obtains required hollow silica gel air bag after the cooling and demolding.During the prepreg compression molding, the silica gel air bag of preparation is in advance placed in the die cavity on the prepreg overlay as inner bag, by the valve internal pressurization, made composite material forming during moulding.

Because that the silica gel air bag is made is simple, use flexibly, so the silica gel core of this mould is capable of circulation repeatedly utilizes, and than with metal core assistant formation mould pressing process, cost is lower.

Claims

1. a prepreg compression molding mould comprises the patrix on top, the counterdie and the middle core of bottom, it is characterized in that described core is a silica gel mould.

2. prepreg compression molding mould according to claim 1 is characterized in that, the silica gel airbag structure that described silica gel mould is a hollow.

3. prepreg compression molding mould according to claim 2 is characterized in that described silica gel air bag has a valve.