CN103963961A - Tail beam fairing molding anti-deformation manufacturing method - Google Patents

Abstract

The invention belongs to the technical field of aircraft manufacturing, and relates to a tail beam fairing molding anti-deformation manufacturing method, which comprises: 1.1, feeding a material, wherein honeycomb is cut into a plurality of sections; 1.2, carrying out butt joint and layer stacking on the plural sections of the honeycombs, wherein the butt joint surface of the honeycombs is added with a carbon cloth I-shaped beam, both sides of the vertical column of the carbon cloth I-shaped beam are respectively the honeycomb butt joint surfaces, and an expansion sheet is arranged between the two layers of the carbon clothes of the vertical column of the carbon cloth I-shaped beam; and 1.3, carrying out curing molding. According to the present invention, the honeycomb stiffness can be increased, the deformation defect of the honeycomb sandwich structure having large curvature change is overcome, the product quality is effectively increased, the manufacturing period is shortened, and the use requirements of users on machine installation are met.

Description

A kind of tail boom fairing moulding anti-deformation manufacture method

Technical field

The invention belongs to aircraft manufacturing technical field, relate to a kind of tail boom fairing moulding anti-deformation manufacture method.

Background technology

Tail boom fairing is " U " shape composite structure, belongs to honeycomb sandwich construction, manufactures exterior skin, inside panel and paper honeycomb form by glass fiber compound material.Due to the deficiency of honeycomb self structure rigidity, distortion (20-25mm) while causing tail boom stream cover integral structure solidified forming, the overproof situation of product is serious, and the manufacturing cycle is longer, and product design cannot ensure, can not meet user's operating needs.

Summary of the invention

Technical matters to be solved by this invention is: a kind of tail boom fairing moulding anti-deformation manufacture method is provided, improves tail boom fairing honeycomb rigidity, overcome the honeycomb sandwich construction deformation defect that deep camber changes.

Technical scheme of the present invention is: a kind of tail boom fairing moulding anti-deformation manufacture method, is characterized by described method and comprise following steps:

1.1 blanking; Be multistage by honeycomb cutting;

1.2 dock multistage honeycomb and laying: increase carbon cloth " work " word beam at honeycomb interface, the column both sides of carbon cloth " work " word beam are respectively honeycomb interface, between the two-layer carbon cloth of carbon cloth " work " word beam column, are expansion piece;

1.3 curing molding.

The invention has the beneficial effects as follows: the present invention is in the time of honeycomb moulding in advance, disconnect honeycomb, optimization laying, the local carbon cloth " H-girder " that increases, can improve honeycomb rigidity, overcome the honeycomb sandwich construction deformation defect that deep camber changes, when tail boom stream covers solidified forming after improving, be out of shape 3-4mm, effectively improve product design, shortened the manufacturing cycle, met user's operating needs of installing.

Detailed description of the invention

Below the specific embodiment of the present invention is described further.

Tail boom fairing moulding anti-deformation manufacture method of the present invention, is made up of following steps in the specific implementation:

1. before producing, prepare:

1.1 get data: get this code (file, the allusion quotation rule of quoting) and drawing, and be conscientiously familiar with, until understand completely.

1.2 get instrument: hammer drill, ruler, angle gage, bevel protractor, blowing hot wind etc., the integrity of checking tool and validity.

2. frock is prepared:

Get required frock by explanation page, and check that frock is excellent and there is certification of fitness, and within table.

2.1 frocks are prepared: on traveler, fill in the figure number of frock used and use the date.

2.2 frock surface cleaning:

2.2.1 apply the dry cloth of dried and clean and remove surperficial dust and foreign material, and come the frock surface of cleaning requirement release agent application with butanone.Rust staining, grease, glue knurl, moisture, mold release and other foreign material should be removed in all frock surfaces contacting with putty bar or vacuum bag.Rust staining, grease, glue knurl, moisture, mold release and other foreign material should be removed in the frock surface that finally reaches frock putty bar or vacuum bag contact.

2.2.2 new system or long-term untapped frock with 220# sand paper polish above, the above sand paper polishing of 480# polishing tool forming surface foreign matter gently, must not damage driving surface, then remove floating dust with dust collecting fan, with the carefully wiping such as gauze, absorbent cotton or cleansing tissue.

2.3 demoulding processing:

2.3.1 brushing mold release (FREKOTE700NC):

1. before coating release agent, seal area should be used blue adhesive tape protection, and width is not less than 50mm, prevents that mold release from polluting this region, and blue tape-stripping is being not less than 20mm place from die edge.

2. mold release does not contact with hand, when coating, will be with gloves.To use in good ventilation region mold release.

3. brushing mold release should be from one end of mould, brushes or spray smooth, the continuous release agent coating of formation one.Attention: before solvent volatilizees completely, repeatedly do not brush or spray mold release in same area, while adopting spraying, keep the distance of nozzle to die surface 20～30 ㎝.

4. for new die or long-term no frock, at least will apply 4～6 layers (larger mould should apply more multi-layered number), every coating one deck should be dried 10～15 minutes, after last one deck coating, at room temperature solidify three hours, or at 100～150 DEG C, dry 15 minutes.

5. after the initial demoulding several times, reply mould recoats mold release.When producing the demoulding at need, can be to whole frock surface recoat mold release, or only demoulding difficult region is recoated to mold release, mould is repaired.

3. material is prepared:

3.1 get material page or the listed main material of group cover page, must open certification of fitness.Check that material subject word is in range of use, low temperature is preserved to material and thaw on request.Clear and definite for the material mark of getting from material depot.Comprising: title material, the trade mark, storage life (Di Wen normal temperature), inspection font size, batch number, cloth reel number (only limiting to preimpregnation material), condition of storage.When taking out from freezer, to fill in prepreg tracking card and traveler record.

The requirement of thawing of 3.2 materials is as follows:

Material thaws and need unpack, and removes warm material, then keeps sealing to be put on bracket and thaws.From freezer, take out material and should keep sealing until be only formed as without moisture in bag or outside bag.If prepreg taking out in bag or in use have moist sign, material is rejected.No prepreg should seal rear Hui Ku, and on tracking card, fills in respective record.

3.3 deposit requirement:

Preimpregnation material should be preserved beyond air conditioning room in the moisture barrier bag of sealing.For supporting good material, should be followed by traveler, or mark have flow process card number and Serial Data, do not allow to fold, can keep flat or roll and deposit.

4. blanking: press corresponding program number and adopt numerical control blanking.

On the material having descended, should do following mark: the machine direction line (0 degree direction line) of product figure number, material code, shape code, Direction code and cloth.Operator makes respective record at route sheet blanking page, fills in program thereby number at operation page blanking procedure simultaneously.

Be multistage by honeycomb cutting.

5. before laying, prepare:

5.1 get auxiliary material listed in material page, must open certification of fitness.Check that material subject word is in range of use, low temperature is preserved to material and thaw on request.

5.2 should guarantee that before laying laying frock carried out preparation and the surperficial dustless free from admixture of mold release, and laying instrument is ready, and laying tool locating hole is clean dustless.

5.3 all laminated materials are ready.Should record outbound and normal temperature subject word at traveler for the material taking out from freezer.

5.4 check the correctness of lower honest material, and by laying page sequential discharging.

5.5 honeycomb sandwich construction part honeycombs are prepared:

5.5.1 before laying, should check accordance and the presentation quality of the honeycomb that has been shaped and frock cellular marker line and avoid makeing mistakes by information such as assembly production orders check honeycomb height, the trade mark, direction, chamferings.

5.5.2 honeycomb, before laying, is applied the pressurized air dedusting that oil removing dewaters.The specific requirement of dedusting, for to have carried unsettled bending block, is used the pressurized air of the oil removing that dewaters to blow off line by line the dust of a side of bending block by hole, then is blown the dust of another side, after being disposed, prevents from polluting with plastic bag protection.

5.5.3 180～240# sand papering craft cloth surface removal of mold release need may be residual with to(for) the preform honeycomb of operation cloth with butanone cleaning, dry.

6. by the docking of multistage honeycomb and laying:

6.1 honeycomb outer ledge lay width Amm carbon cloths;

At honeycomb docking location lay carbon cloth, honeycomb joint is placed J-94, at honeycomb docking location lay carbon cloth Bmm;

Honeycomb Inner lateral edges lay width Amm carbon cloth;

6.2 layings require:

1. as there being the parts such as locating dowel pin on forming die, allow this position preimpregnation cloth to disconnect when laying, in case unsettled, paving is applied and is not leaned on.

2. because alteration of form or the practical operation of part need, allow layer of cloth overlap joint or cut across mouth, lap width 5～10mm.Laying on the corner as occur gauffer, allows to cut off, but every layer of cloth should not cut off at same place, and 15mm～30mm as far as possible should stagger.Because clip causes the local cloth situation that lacks, apply equidirectional cloth and shear in paving, lap width 15mm～25mm, its lap position staggers, and prevents sunburner.

3. honeycomb size and angle tolerance: equal altitudes honeycomb gauge tolerance is ± 0.2mm, honeycomb corner cut dimension limit is ± 4 °, honeycomb profile dimension limit is pressed HB7741.

4. lateral dimension is greater than the honeycomb core permission splicing of 1m, and butt-joint clearance is not more than 11.5mm, then in the middle of butt seam, places 1～2 layer, the J-94 glued membrane contour with honeycomb.Two spliced cellular direction and the trade mark should be consistent.

5. the one-way tape cloth of laying along load direction, does not allow docking; Allow overlap joint, overlap joint size 15mm～30mm; But the unidirectional cloth of laying along load direction, because width is inadequate, broad ways allows splicing, and splicing tolerance is 0～2mm.

If 6. honeycomb docks or accidentally tears, allow to dock with expansion piece.Expansion piece width etc. are higher than honeycomb thickness.

7. layer of cloth is beaten clip and is only allowed to use scissors and do not allow to use other instrument without use.

8. as need on exposed preimpregnation cloth, mark, can only use and can contact marking pen and identify setting-out.

9. normal temperature vacuumizes compacting, and the timing initial point of compacting should start timing after vacuum bag completely densified.After compacting, should detect compaction quality and ensure no wrinkle and bridge formation.

6.3 increase carbon cloth " work " word beam at honeycomb interface, and the column both sides of carbon cloth " work " word beam are respectively honeycomb interface, between the two-layer carbon cloth of carbon cloth " work " word beam column, are expansion piece.

7. paste vacuum bag:

Paste the front notice of vacuum bag:

In order to obtain good surface quality, after laying finishes, if giving the contact surface layer overlay cloth that strips off the skin again that soaks cloth. product profile is more smooth, under the prerequisite of not building bridge in part, the cloth that strips off the skin that can lay large-size; As large in fruit product curvature or have a turning, at turning or curvature larger part, adopt size to be no more than the cloth overlap joint that strips off the skin of 200 × 400mm, lap width is 0-10mm; The cloth that strips off the skin does not allow unsettled on turning, in order to avoid it is unreal to pressurize.

In frock, there are acute angle bogging down area or hole, fill up with silica gel piece, be finished silica gel piece, need wash one's hands with soap, in case while beating again bag, pollute putty bar or vacuum bag, cause leak-off pocket.

Putty bar stick on from die edge be not less than 20mm place putty bar on frock angle mutually overlap joint; Rust staining, grease, glue knurl, moisture, mold release and other foreign material should be removed in all frocks contacting with putty bar or vacuum bag surface; Putty bar can not be attached on release cloth.

Mould release film size should be than the large 15-30mm of product surface periphery; The paving of mould release film requires smooth, not unsettled.Avoid gauffer as far as possible, do not allowed arch formation; The paving of mould release film can cutting, overlap joint, as required can be with blue adhesive tape adhesion mould release film; Mould release film will cover product surface completely, can not have leak source.

The size of airfelt should ensure to cover product completely, is greater than barrier film more than 20, and communicates with the section bar of bleeding; The gabarit edge of airfelt is not more than 10mm far from the size of putty bar, but can not top putty bar.Acute angle place airfelt should disconnect.

Airfelt lay one deck or two layers all can, if the thicker gummosis of part layering number is more, should increase the number of plies of airfelt.

Under the seat of empty gonys, need to pad 4-6 layer airfelt.Product surface is long-pending larger, generally exceedes vacuum nozzle of the corresponding increase of 1.5m2; Product exist eight jiao etc. complex-curved, should be near adopting outstanding bag method to increase a vacuum nozzle on eight jiao of place's product; Mouthpiece can not be placed on product surface, otherwise can cause the defect of part and mouthpiece to be blocked by glue, and vacuum nozzle requires diagonal angle to place, and detection vacuum nozzle must be set.

A pleat of the corresponding increase of each section change place of mould or part, pleat is wanted left and right symmetry; The length of each pleat is about 100-120mm.

After empty bag paste is good, detect degree of vacuum, require the above maintenance of negative pressure 0.08MPa to stablize 5-10 minute, and within 5min, the vacuum leak of frock should not exceed 0.02MPa.

8. before solidifying, prepare:

8.1 check whether low temperature preservation material exceeds the time limit.

8.2 check that thermocouple is in good condition, and metal wool does not have exposed section.

8.3 thermocouples connect, and thermocouple is positioned at thermocouple mounting hole place or is injected in the laying of outside, last deburring region.

8.4 pairs of vacuum bag pressure testings, and check and guarantee that vacuum bag is without arch formation, vacuum connects mouth place vacuum bag phenomenon with no pressure, keeps stablizing 5-10 minute more than negative pressure 0.08MPa.

8.5 after above content completes, and solidifies work and on log sheet, writes following content clearly: component part NO.---Serial Data---vacuum line number---thermocouple number

8.6 can be with 1 thermocouple for the following part of 1 ㎡, and the part that is greater than 1 ㎡ need to be with two thermocouples.Two thermocouples for this part.

9. solidify:

Intensification reaches 125 DEG C ± 5 DEG C; Be incubated 2 hours+10 minutes, heat up and start to add negative pressure: 0.08MPa ± 0.01MPa, 1.5 DEG C/min of heating rates (max), 3 DEG C/min of rate of temperature fall (max), open below fire door, come out of the stove for 60 DEG C.

10. come out of the stove, Qi Mo, cleaning:

10.1 below 60 DEG C (honeycomb sandwich construction part is below 40 DEG C) come out of the stove, then open mould with the careful demoulding of nonmetallic instrument that meets the requirements; Cleaning die surface superfluity; Do not damage product and die face.

After 10.2 frock cleanings, require reset and check that mould has or not damage, fill in mould and use record.

Frock is put back to assigned address by 10.3.Frock is the used time not, requires to cover, to prevent pollution.

10.4 cleaning piece surfaces: remove the foreign matter such as cloth, barrier film that strips off the skin that remains in part surfaces externally and internally, the available flat cutter in the outstanding sharp-pointed place of piece surface is removed but can not injure piece surface fiber.

11. millings

Press line of cut milling.Equal altitudes honeycomb gauge tolerance+0.2mm, honeycomb profile dimension limit is pressed HB7741.

12. lead angles

Honeycomb angle lead angle by drawing, lead angle is answered uniformity, and guiding angle surface is smooth, without burr, honeycomb zero damage.Lead angle tolerance: ± 4 °.

13. hang interim head-stamp: temporary marker is used white glue cloth, the information such as mark figure number, Serial Data, date on it.

14. pay.

Claims (1)

1. a tail boom fairing moulding anti-deformation manufacture method, is characterized by described method and comprises following steps:

1.1 blanking; Be multistage by honeycomb cutting;

1.2 dock multistage honeycomb and laying: increase carbon cloth " work " word beam at honeycomb interface, the column both sides of carbon cloth " work " word beam are respectively honeycomb interface, between the two-layer carbon cloth of carbon cloth " work " word beam column, are expansion piece;

1.3 curing molding.