CN102092137B - High-temperature high-pressure vacuum nozzle and sealing method thereof - Google Patents
High-temperature high-pressure vacuum nozzle and sealing method thereof Download PDFInfo
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- CN102092137B CN102092137B CN2010105435340A CN201010543534A CN102092137B CN 102092137 B CN102092137 B CN 102092137B CN 2010105435340 A CN2010105435340 A CN 2010105435340A CN 201010543534 A CN201010543534 A CN 201010543534A CN 102092137 B CN102092137 B CN 102092137B
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Abstract
The invention relates to a high-temperature high-pressure vacuum nozzle and a sealing method thereof. The high-temperature high-pressure vacuum nozzle comprises a clamp nut, a compression ring, a pipe joint and a base plate, wherein the base plate is of a truncated cone structure, the upper surface of the base plate is processed with one, two or three circular grooves, the lower surface of the compression ring is processed with tenons which are matched with the circular grooves, a plurality of layers of film gaskets are arranged between the matching surfaces of the base plate and the compression ring, each film gasket is of a sheet structure with holes in the middle, is 0.05-0.1mm in thickness, and is made from nylon, fluoroplastic or polyimide. By processing one to three sealing grooves on the upper surface of the truncated cone of the base plate and the matched tenons on the lower surface of the compression ring, the high-temperature high-pressure vacuum nozzle plays the effect of a sealing gasket as the flexible film gaskets can necessarily deform under the pressing force, realizes the mechanical sealing between the compression ring and the base plate by the compression force of the nut and the deformation of the film gaskets, and is able to resist high temperature of 300 DEG C and above and pressure of 1.0MPa or above. The vacuum nozzle provided by the invention is made of metal materials, and the film gaskets are made from materials which have the temperature grade higher than or equal to the film material of vacuum bags and can meet requirements on molding process of high-temperature resistant composite autoclaves.
Description
Technical field
The present invention relates to a kind of vacuum nozzle and encapsulating method, (temperature＞300 ℃, pressure＞1.0MPa) the vacuum bag sealing with vacuum nozzle and encapsulating method, belongs to the autoclave molding technical field with high temperature high voltage resistant particularly to relate to a kind of polymer matrix composites autoclave forming process.
Background technology
Vacuum bag/autoclave forming process remains the moulding process of high-quality resin-based compound material component at present.The positiver sealing of vacuum bag is indispensable link and precondition in this technique.Vacuum nozzle is the blank area in the vacuum bag system, its effect is that the vacuum system with vacuum bag system and autoclave couples together by the metal vacuum pipeline, guarantee to keep in the vacuum bag system vacuum of appointment under the state of the outside HTHP of vacuum bag, realize the Effective Compaction of composite element, reduce the hole of composite element inside, improve component quality.This is particularly important in the manufacturing of the expensive large-sized structural parts product of Aero-Space, can solve the technique bottleneck difficult problem that product is made, and reduces scrappage, guarantees the delivery time node.
Vacuum nozzle generally is comprised of substrate, sealing gasket, pressing plate and clamp nut, and existing vacuum nozzle sealing gasket adopts silicane rubber plate usually, when screwing clamp nut, plays the effect of sealing ring under the effect of pressure.The maximum operation (service) temperature of silicane rubber plate is about 230 ℃.Practice shows, existing vacuum nozzle can satisfy the moulding of the members such as epoxy resin-base composite material, and the solidification temperature of epoxy generally is about 170 ℃, and pressure is about 0.6MPa.But, moulding for fire resistant resin based composite material components such as bismaleimide resin, polyimide resins, must adopt more than 300 ℃ and the above HTHP of 1.0MPa, just can overcome the frictional resistance of resin, realize the softening mobile of resin, composite compacting the most at last obtains high-quality composite and member thereof.The weak point that prior art exists is silicane rubber plate aging cracking under long-time high-temperature and high-pressure conditions, lose necessary intensity and elasticity, even form the perforation that connects, cause the vacuum bag system vacuum to leak, can not realize the compacting of member, finally cause scrapping of member.In order to solve this difficult problem, need to manufacture and design a kind of novel high temperature high voltage resistant vacuum nozzle, satisfy the autoclave forming process requirement of polyimide resin based composite structure member.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provide a kind of ability more than 300 ℃ high temperature and 1.0MPa with high temperature high voltage resistant vacuum nozzle and the encapsulating method of upward pressure, realize that vacuum bag is connected with the reliable of vacuum system, satisfy the autoclave forming process requirement of bismaleimide resin, polyimide resin based composite structure member.
Technical solution of the present invention is: a kind of HTHP vacuum nozzle, comprise clamp nut, pressure ring, pipe joint and substrate, described substrate is frustum cone structure, upper surface processing 1,2 or 3 road annular grooves, the pressure ring lower surface is processed with the tenon that coordinates with annular groove, places some layer film pads between the mating surface of substrate and pressure ring, and the film pad is the laminated structure of middle with hole, thickness is 0.05～0.1mm, and material is nylon, fluoroplastics or polyimides.
Described film pad interstitial hole diameter is greater than the pipe joint external diameter and less than the internal diameter of outer annular groove.
Described film pad is circular or square, and full-size is greater than 10～20mm of outermost annular groove external diameter.
Interval between described annular groove is not less than 5mm, and the diameter of annular groove is 3～5mm, and outer annular groove is 10～20mm apart from the distance in substrate center hole.
The mismatch error of described tenon and annular groove is 0.1～0.2mm, and namely the diameter of tenon is less than 0.1～0.2mm of annular groove diameter.
Described film pad is 1～6 layer.
A kind of encapsulating method that utilizes the HTHP vacuum nozzle, realize by following steps:
The first step, at upper surface of base plate processing 1～3 road annular groove, the tenon that coordinates with annular groove in the corresponding processing of pressure ring lower surface;
Second step, film processed pad, film pad are the circular or square slab organization of middle with hole, and thickness is 0.05～0.1mm, middle bore dia is greater than the pipe joint external diameter and less than the internal diameter of outer annular groove, full-size is greater than 10～20mm of outermost annular groove external diameter;
In the 3rd step, place 1～3 layer film pad on the substrate of having processed annular groove;
In the 4th step, place the vacuum bag that will seal on the film pad;
The 5th step is at upper placement 1～3 layer film pad of vacuum bag;
In the 6th step, obtain on the film pad, pressure ring being installed in the 5th step;
The 7th step, with clamp nut is installed on pressure ring, tighten, substrate, film pad, vacuum bag and pressure ring are compressed.
The present invention compared with prior art beneficial effect is:
(1) the present invention adopts at substrate round platform upper surface processing 1～3 road sealed groove, coordinate the processing tenon at the pressure ring lower surface simultaneously, necessary deformation occurs in the flexible film pad of recycling under the effect of thrust, played the effect of sealing gasket, thrust by nut and the deformation of film can realize the mechanical seal between pressure ring and substrate, make ability of the present invention more than 300 ℃ high temperature and 1.0MPa with upward pressure;
(2) material of the vacuum nozzle of the present invention's employing is metal material, and the temperature resistant grade of the material that the film pad is selected can satisfy the requirement of high temperature resistant composite autoclave forming process higher than vacuum bag thin-film material or identical with the vacuum bag film;
(3) up to the present the present invention has carried out polyimide resin based composite vacuum bag/autoclave engineer testing more than 30 times, experimental condition is 400 ℃ of air pressure 1.5MPa, air themperatures, time is no less than 12 hours, occur without the vacuum leak phenomenon, result of the test shows that the vacuum bag that this vacuum nozzle can solve HTHP composite autoclave forming process is connected with the reliable of vacuum system, has guaranteed the moulding manufacturing of high temperature resistant advanced composite material;
(4) processing dimension determined of the present invention under the prerequisite that guarantees sealing, has guaranteed the operability when processing is installed.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is base plate bottom structural representation of the present invention;
Fig. 3 is the partial enlarged drawing of Fig. 2 A-A, B-B direction;
Fig. 4 is three kinds of structural representations of substrate of the present invention;
Fig. 5 is the pressure plate structure schematic diagram that coordinates with substrate in Fig. 4;
Fig. 6 is flow chart of the present invention.
The specific embodiment
The present invention as shown in Figure 1, comprise clamp nut 1, pressure ring 2, pipe joint 3 and substrate 4, substrate 4 is frustum cone structure, upper surface processing 1～3 road annular groove 41, pressure ring 2 lower surfaces are processed with the tenon 21 that coordinates with annular groove 41, the quantity of tenon 21 is consistent with annular groove 41, places some layer film pads between the mating surface of substrate 4 and pressure ring 2.
The vacuum nozzle material can be the metal materials such as ordinary steel, aluminium, copper.
The film pad is the laminated structure of middle with hole, and thickness is 0.05～0.1mm.Film pad interstitial hole diameter is greater than the pipe joint external diameter and less than the internal diameter of outer annular groove.The film pad is circular or square, and full-size is greater than 10～20mm of outermost annular groove external diameter.The film pad is 1～6 layer, and the film pad can be selected vacuum bag film homogeneous material, also can select the higher nylon of temperature resistant grade, fluoroplastics, the film that polyimides is made, preferably select vacuum bag film homogeneous material, the leftover pieces that get during the vacuum bag encapsulation get final product, and conveniently are easy to get.
Interval between annular groove 41 is not less than 5mm, and the diameter of annular groove is 3～5mm, and outer annular groove is 10～20mm apart from the distance in substrate center hole.
The mismatch error of tenon and annular groove is 0.1～0.2mm, and namely the diameter of tenon is less than 0.1～0.2mm of annular groove diameter.
Encapsulating method: during the vacuum bag encapsulation, place one or more layers film pad with holes on substrate, the aperture is slightly larger than the pipe joint external diameter, then process a slightly larger in diameter in the circular hole of pipe joint external diameter on the vacuum bag film, the vacuum bag film is placed on substrate by pipe joint, again one or more layers is placed on substrate with the film pad, then loads onto pressure ring, then with nut, each part mentioned above is compressed.Be connected with vacuum system with vacuum metal pipe at last and can realize that vacuum nozzle is connected with the reliable of vacuum system.Said film can be selected vacuum bag film homogeneous material, also can select the higher nylon of temperature resistant grade, fluoroplastics, the film that polyimides is made, thickness is selected 0.05mm～0.1mm, preferably select vacuum bag film homogeneous material, the vacuum bag leftover pieces get final product, and conveniently are easy to get.
Concrete steps realize by following steps as shown in Figure 4:
1, at upper surface of base plate processing 1～3 road annular groove, the tenon that coordinates with annular groove in the corresponding processing of pressure ring lower surface;
2, film processed pad, the film pad is the circular or square slab organization of middle with hole, thickness is 0.05～0.1mm, and middle bore dia is greater than the pipe joint external diameter and less than the internal diameter of outer annular groove, full-size is greater than 10～20mm of outermost annular groove external diameter;
3, place 1～3 layer film pad on the substrate of having processed annular groove;
4, place the vacuum bag that will seal on the film pad;
5, at upper placement 1～3 layer film pad of vacuum bag;
6, on the film pad of previous step, pressure ring is installed;
7, with clamp nut is installed on pressure ring, tighten, substrate, film pad, vacuum bag and pressure ring are compressed.
Describe in detail below in conjunction with specific embodiment:
The moulding of polyimide resin based composite, the vacuum bag film is selected the 0.05mm thick polyimide film, and sealing joint strip is selected SM5160.The substrate of vacuum nozzle, pipe joint, nut all adopt steel Q235-A level, and pressure ring can be selected the manufacturing of steel Q235-A level.Structure choice a type.
During the vacuum bag encapsulation, place one deck film pad with holes on substrate, the aperture is slightly larger than the pipe joint external diameter, then process a slightly larger in diameter in the circular hole of pipe joint external diameter on the vacuum bag film, the vacuum bag film is placed on substrate by pipe joint, again one deck is placed on substrate with the film pad, then loads onto pressure ring, then with nut, each part mentioned above is compressed.Be connected with vacuum system with vacuum metal pipe at last and can realize that vacuum nozzle is connected with the reliable of vacuum system.Experimental condition: autoclave air pressure 1.5MPa, 399 ℃ of air themperatures, 20 hours time.Result of the test: the vacuum nozzle sealing is intact, and vacuum bag is without leakage.
The moulding of polyimide resin based composite, the vacuum bag film is selected the 0.05mm thick polyimide film, and sealing joint strip is selected SM5160.The substrate of vacuum nozzle, pipe joint, nut all adopt steel Q235-A level, and pressure ring aluminium 1035 is made, structure choice b type.
During the vacuum bag encapsulation, place two-layer film pad with holes on substrate, the aperture is slightly larger than the pipe joint external diameter, then process a slightly larger in diameter in the circular hole of pipe joint external diameter on the vacuum bag film, the vacuum bag film is placed on substrate by pipe joint, again the double-layer films pad is placed on substrate, then loads onto pressure ring, then with nut, each part mentioned above is compressed.Be connected with vacuum system with vacuum metal pipe at last and can realize that vacuum nozzle is connected with the reliable of vacuum system.Experimental condition: autoclave air pressure 1.5MPa, 399 ℃ of air themperatures, 20 hours time.Result of the test: the vacuum nozzle sealing is intact, and vacuum bag is without leakage.
The moulding of polyimide resin based composite, the vacuum bag film is selected the 0.075mm thick polyimide film, and sealing joint strip is selected SM5160.The substrate of vacuum nozzle, pipe joint, nut and pressure ring all adopt steel Q235-A level, structure choice c type.
During the vacuum bag encapsulation, place two-layer film pad with holes on substrate, the aperture is slightly larger than the pipe joint external diameter, then process a slightly larger in diameter in the circular hole of pipe joint external diameter on the vacuum bag film, the vacuum bag film is placed on substrate by pipe joint, again the double-layer films pad is placed on substrate, then loads onto pressure ring, then with nut, each part mentioned above is compressed.Be connected with vacuum system with vacuum metal pipe at last and can realize that vacuum nozzle is connected with the reliable of vacuum system.Experimental condition: autoclave air pressure 1.5MPa, 399 ℃ of air themperatures, 20 hours time.Result of the test: the vacuum nozzle sealing is intact, and vacuum bag is without leakage.
The moulding of bimaleimide resin base composite material, the vacuum bag film is selected the 0.05mm thick polyimide film, and sealing joint strip is selected SM5160.The substrate of vacuum nozzle, pipe joint, nut all adopt steel Q235-A level, and structure is selected a type.
During the vacuum bag encapsulation, place two-layer film pad with holes on substrate, the aperture is slightly larger than the pipe joint external diameter, then process a slightly larger in diameter in the circular hole of pipe joint external diameter on the vacuum bag film, the vacuum bag film is placed on substrate by pipe joint, again the double-layer films pad is placed on substrate, then loads onto pressure ring, then with nut, each part mentioned above is compressed.Be connected with vacuum system with vacuum metal pipe at last and can realize that vacuum nozzle is connected with the reliable of vacuum system.Experimental condition: autoclave air pressure 1.0MPa, 300 ℃ of air themperatures, 16 hours time.Result of the test: the vacuum nozzle sealing is intact, and vacuum bag is without leakage.
Embodiment 5
The thick HS6262 nylon film of 0.075mm is selected in the moulding of epoxy resin-base composite material, vacuum bag film, and sealing joint strip is selected SM9151.The substrate of vacuum nozzle, pipe joint, nut all adopt steel Q235-A level, and pressure ring can aluminium 1035 be made, and structure is selected a type.
During the vacuum bag encapsulation, place two-layer film pad with holes on substrate, the aperture is slightly larger than the pipe joint external diameter, then process a slightly larger in diameter in the circular hole of pipe joint external diameter on the vacuum bag film, the vacuum bag film is placed on substrate by pipe joint, again the double-layer films pad is placed on substrate, then loads onto pressure ring, then with nut, each part mentioned above is compressed.Be connected with vacuum system with vacuum metal pipe at last and can realize that vacuum nozzle is connected with the reliable of vacuum system.Experimental condition: autoclave air pressure 0.6MPa, 200 ℃ of air themperatures, 10 hours time.Result of the test: the vacuum nozzle sealing is intact, and vacuum bag is without leakage.
The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (1)
1. the encapsulating method of a HTHP vacuum nozzle, described HTHP vacuum nozzle, comprise clamp nut (1), pressure ring (2), pipe joint (3) and substrate (4), it is characterized in that: described substrate (4) is frustum cone structure, upper surface processing 1～3 road annular groove (41), pressure ring (2) lower surface is processed with the tenon (21) that coordinates with annular groove (41), place some layer film pads between the mating surface of substrate (4) and pressure ring (2), the film pad is the laminated structure of middle with hole, thickness is 0.05～0.1mm, material is nylon, fluoroplastics or polyimides, it is characterized in that the method realizes by following steps:
The first step, at substrate (4) upper surface processing 1～3 road annular groove (41), the tenon (21) that coordinates with annular groove in the corresponding processing of pressure ring (2) lower surface;
Second step, the film processed pad, the film pad is the circular or square slab organization of middle with hole, thickness is 0.05～0.1mm, middle bore dia is greater than pipe joint (3) external diameter and less than the internal diameter of outer annular groove (41), full-size is greater than 10～20mm of outermost annular groove external diameter;
The 3rd step is at upper 1～3 layer film pad of placing of the substrate (4) of having processed annular groove (41);
In the 4th step, place the vacuum bag that will seal on the film pad;
In the 5th step, place 1～3 layer film pad on vacuum bag;
In the 6th step, on the film pad in the 5th step, pressure ring (2) is installed;
The 7th step, with clamp nut (1) is installed on pressure ring, tighten, substrate (4), film pad, vacuum bag and pressure ring (2) are compressed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105435340A CN102092137B (en) | 2010-11-12 | 2010-11-12 | High-temperature high-pressure vacuum nozzle and sealing method thereof |
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| CN2010105435340A CN102092137B (en) | 2010-11-12 | 2010-11-12 | High-temperature high-pressure vacuum nozzle and sealing method thereof |
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| CN102092137B true CN102092137B (en) | 2013-06-26 |
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| CN105716964A (en) * | 2016-04-28 | 2016-06-29 | 中南大学 | Sealed electric conduction device capable of guiding pulse current into autoclave and sealed electronic conduction method capable of guiding pulse current into autoclave |
| CN106696304A (en) * | 2016-11-23 | 2017-05-24 | 安徽佳力奇碳纤维科技股份公司 | Carbon fiber composite material vacuumizing device and vacuumizing method thereof |
| CN106827577A (en) * | 2016-11-23 | 2017-06-13 | 安徽佳力奇碳纤维科技股份公司 | A kind of carbon fibre composite vacuum bag assembly and its vacuum pumping method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1749079A (en) * | 2005-10-18 | 2006-03-22 | 成都飞机工业（集团）有限责任公司 | Method for producing magnetic suspension vehicle headstock and its sandwich structure |
| CN1775507A (en) * | 2005-10-18 | 2006-05-24 | 成都飞机工业（集团）有限责任公司 | Thermal forming method for PMI foam laminated structure |
| CN101782029A (en) * | 2009-01-15 | 2010-07-21 | 北京航空航天大学 | Device for testing flow characteristics of gas-gas nozzle |
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- 2010-11-12 CN CN2010105435340A patent/CN102092137B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1749079A (en) * | 2005-10-18 | 2006-03-22 | 成都飞机工业（集团）有限责任公司 | Method for producing magnetic suspension vehicle headstock and its sandwich structure |
| CN1775507A (en) * | 2005-10-18 | 2006-05-24 | 成都飞机工业（集团）有限责任公司 | Thermal forming method for PMI foam laminated structure |
| CN101782029A (en) * | 2009-01-15 | 2010-07-21 | 北京航空航天大学 | Device for testing flow characteristics of gas-gas nozzle |
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