CN102107537A - Method for forming crosslinked polyvinyl chloride foam sandwich structure part - Google Patents
Method for forming crosslinked polyvinyl chloride foam sandwich structure part Download PDFInfo
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- CN102107537A CN102107537A CN2010105439727A CN201010543972A CN102107537A CN 102107537 A CN102107537 A CN 102107537A CN 2010105439727 A CN2010105439727 A CN 2010105439727A CN 201010543972 A CN201010543972 A CN 201010543972A CN 102107537 A CN102107537 A CN 102107537A
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- chloride foam
- polrvinyl chloride
- foam core
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Abstract
The invention belongs to the technical field of manufacturing of aviation composite material parts, and relates to a method for solving the problem of thermal expansion of a crosslinked polyvinyl chloride foam sandwich structure part. The method comprises the following steps of: testing the size stability of crosslinked polyvinyl chloride foam; packaging a foam core which is cut into a cube in a vacuum bag and heating in a heating furnace; recording variation in size at different temperatures; calculating expansion ratios or shrinkage ratios in directions X, Y and Z respectively; determining an appearance pre-shrinkage direction and shrinkage according to an actual shape and a mould constraint condition of the part; reasonably performing appearance machining on a foam core; eliminating the expansion of a part which possibly expands; and spreading and adhering skin by taking an intermediate-temperature curing adhesive as an adhesive for a core layer and the skin after the core layer is processed, and then co-curing and integrally forming the part to avoid layering of the part.
Description
Technical field
The invention belongs to aviation composite material parts manufacturing technology field, relate to a kind of method that solves cross-linked polrvinyl chloride foamed sandwich structure part expanded by heating.
Background technology
The foamed plastics sandwich structure is used very extensive at present in the product for civilian use, and is also more and more in the Aeronautics and Astronautics Application for Field, as cabin interior trim and aircraft external structure etc.Foam core filled composite material spare is compared with the composite layer casting die, and foamed sandwich structure has fully improved flexural rigidity and flexural strength; Foam sandwich construction is compared with the conventional aluminum alloy structure, and the foam sandwich construction part has alleviated the weight of part to greatest extent.Its forming method mainly contains methods such as compression molding method, foaming method, hot-forming method, machining.These methods need be selected to adopt according to different foam material, different structure form.
Part complex contour because of manufacturing; and foamed core adds warm deformation; together heating cure; now process this type of part methods that adopt is covering and sandwich layer processing and manufacturing respectively more: covering is curing molding on punch; foam core is made according to digital-to-analogue machining, by cold setting adhesive two parts cover is sticked together again.It is improper that fit clearance often appears in the interior shape of sandwich layer profile and covering, and the phenomenon in cavity is arranged between bonding back covering and sandwich layer, and most of part just can use after needing injecting glue to reprocess, but overweight serious.
Summary of the invention
The objective of the invention is: be difficult to control in order to cause the part profile behind the cross-linked polrvinyl chloride foam core expanded by heating that overcomes became uneven, complex contour, do not meet the problem of matching requirements, propose a kind of forming method of cross-linked polrvinyl chloride foamed sandwich structure part.
Technical solution of the present invention is: (1) preparation cross-linked polrvinyl chloride foam core
According to digital-to-analogue and following dimensional requirement establishment nc program, preparation cross-linked polrvinyl chloride foam core.Dimensional requirement: H
0=H, L
0=L/ (1+2%), W
0=W/ (1+2%), promptly cross-linked polrvinyl chloride foam core part height dimension H is identical with digital-to-analogue, and length L size and width W size are all dwindled by 2% expansion rate of digital-to-analogue size.
In the formula: H
0---machine adds back part height dimension
L
0---machine adds back part length size
W
0---machine adds back part width dimensions
H---digital-to-analogue height dimension
L---digital-to-analogue length dimension
W---digital-to-analogue width dimensions
The present invention requires the Digit Control Machine Tool process velocity to be not less than 40 meter per seconds in addition, and uses the hard alloy cutter cutting.
(2) with 3218 prepregs according to honest material under the appearance and size, for future use;
(3) use calico with cross-linked polrvinyl chloride foam core piece surface wiped clean, then the J-47B glue is brushed to be pasted of cross-linked polrvinyl chloride foam core, requiring glue-spread is 100 ± 10g/m
2, and at room temperature dry in the air to 5min～10min;
(4) 3218 prepregs that will descend are wrapped on to be pasted of the cross-linked polrvinyl chloride foam core part of brushing the J-47B glue successively;
(5) the cross-linked polrvinyl chloride foam layer part that will wrap up 3218 prepregs is placed in the shaping mould tire, and seal vacuum bag, then part and mould tire are together sent into and carried out co-curing in the pot arch, the technological parameter that solidifies is: vacuum pressure reaches-and begins to heat during 0.08MPa, heat to 70 ± 5 ℃ insulation 60min; Heat to 100 ± 5 ℃ insulation 60min; Heat to 130 ± 5 ℃, insulation 90min naturally cools at last and takes out part after the room temperature and carry out surfacing.
Advantage and beneficial effect that the present invention has are: the present invention tests the dimensional stability of cross-linked polrvinyl chloride foam, the foam core that cuts into square is encapsulated in the vacuum bag, record size variable quantity calculates expansion rate or shrinkage factor on X, Y, three directions of Z under different temperatures.Determine that at the true form of part and mould constraint situation profile shrinks direction and amount of contraction in advance, reasonably foam core material is carried out profile machining, the swell increment excision at the position that may expand.After sandwich layer processes, adopt the bonding agent of intermediate temperature setting adhesive, carry out the part global formation as sandwich layer and covering, guarantee co-curing after part can layering.
Pass through engineer testing, the present invention has grasped the expansion temperature point and the expansion rate of crosslinked polyvinyl chloride foam, found the profile control method of foam core complex profile, effectively control the distortion that foamed plastics expands and brings, adopt numerical control machine to add the manufacture method of the complex appearance and the whole co-curing of part of foamed core, produced the part that profile adheres to specification.It is easy that the present invention has operation, the part good integrity that molds, the surface quality height, during pts wt is light, anti-warm nature can be good etc. advantage.
Description of drawings
Fig. 1 is the high-level schematic of cross-linked polrvinyl chloride foam core of the present invention;
Fig. 2 is the length and the width indication figure of cross-linked polrvinyl chloride foam core of the present invention.
The specific embodiment
Below the present invention is described in further details.A kind of method that solves the cross-linked polrvinyl chloride foam core part expanded by heating of complex contour, based on to the determining of the direction of the determining of foam core expansion rate and shrinkage factor, pucker ﹠ bloat, profile that numerical control machine adds foam core, with the process of prepreg co-curing determine to reach effective control to the part profile.It is characterized in that the concrete steps that solve above-mentioned cross-linked polrvinyl chloride foam core expanded by heating are as follows:
(1) preparation cross-linked polrvinyl chloride foam core
Prepare the cross-linked polrvinyl chloride foam core according to digital-to-analogue and following dimensional requirement establishment nc program.Dimensional requirement: H
0=H, L
0=L/ (1+2%), W
0=W/ (1+2%), promptly cross-linked polrvinyl chloride foam core part height dimension H is identical with digital-to-analogue, and length L size and width W size are all dwindled by 2% expansion rate of digital-to-analogue size.
In the formula: H
0---machine adds back part height dimension
L
0---machine adds back part length size
W
0---machine adds back part width dimensions
H---digital-to-analogue height dimension
L---digital-to-analogue length dimension
W---digital-to-analogue width dimensions
The present invention requires the Digit Control Machine Tool process velocity to be not less than 40m/s in addition, and uses the hard alloy cutter cutting.
(2) with 3218 prepregs according to honest material under the appearance and size, for future use;
(3) use calico with cross-linked polrvinyl chloride foam core piece surface wiped clean, then the J-47B glue is brushed to be pasted of cross-linked polrvinyl chloride foam core, requiring glue-spread is 100 ± 10g/m
2, and at room temperature dry in the air to 5min～10min;
(4) 3218 prepregs that will descend are wrapped on the cross-linked polrvinyl chloride foam core part stickup face of brushing the J-47B glue successively;
(5) the cross-linked polrvinyl chloride foam layer part that will wrap up 3218 prepregs is placed on the shaping mould tire, and seal vacuum bag, then part and mould tire are together sent into and carried out co-curing in the pot arch, the technological parameter of curing sees Table 1, treats at last to take out after part naturally cools to room temperature.
Table 1
| Pressure (MPa) | Temperature (℃) | Time (min) |
| -0.08 | 70±5 | 60 |
| -0.08 | 100±5 | 60 |
| -0.08 | 120±5 | 90 |
Embodiment
The embodiment of the forming method of a kind of cross-linked polrvinyl chloride foamed sandwich structure of the present invention part as shown in Figure 1 and Figure 2.
(1) digital-to-analogue of part is of a size of: H=40mm, and L=800mm, W=600mm calculates machine according to dimensional requirement and adds back part height dimension H
0=H=40mm; Machine adds back part length size L
0=L/ (1+2%)=784.32mm; Machine adds back part width dimensions W
0=W/ (1+2%)=588.24mm is then according to digital-to-analogue profile and data H
0=40mm, L
0=784.32mm, W
0The requirement establishment nc program that=588.24mm and Digit Control Machine Tool process velocity are not less than 40m/s prepares the cross-linked polrvinyl chloride foam core, sees Fig. 1.
(2) with the used two kinds of trade mark 3218 prepregs of forming part, SW110A/3218 and SW220A/3218 descend honest material respectively according to appearance and size, for future use;
(3) use calico with cross-linked polrvinyl chloride foam core piece surface wiped clean, then the J-47B glue is brushed to be pasted of cross-linked polrvinyl chloride foam core, requiring glue-spread is 100 ± 10g/m
2, and at room temperature dry in the air to 5min～10min;
(4) 3218 prepregs that will descend are wrapped on the cross-linked polrvinyl chloride foam core part stickup face of brushing the J-47B glue successively, must not wrap up bubble, impurity therebetween.When moulding, the shop in sharp corner, Zone R territory is covered and can suitably be used the hair dryer hot briquetting, to guarantee the part profile.Need the zone of overlap joint, lap width is 5～10mm; The seam of levels cloth will stagger, and the amount of staggering is no less than 100mm.Every layer of cloth can heat paving with hair dryer, all wants compacting, does not allow bubble, fold existence between layer and the layer.
(5) the cross-linked polrvinyl chloride foam layer part that will wrap up 3218 prepregs is placed on the shaping mould tire, put barrier film then well, inhale back encapsulated vacuum bags such as glue-line (EW200 is two-layer), airfelt, vacuum diaphragm, vacuum nozzle and thermocouple, at last part and mould tire are together sent into and carried out co-curing in the pot arch, the technological parameter that solidifies sees Table 1, treats to take out after part naturally cools to room temperature.
(6) put into the check mould after the part demoulding and check and the applying of mould tire, check that smooth in appearance is smooth, be qualified products, the referable installation is used.
Claims (1)
1. the forming method of a cross-linked polrvinyl chloride foamed sandwich structure part is characterized in that:
(1) preparation cross-linked polrvinyl chloride foam core
According to digital-to-analogue and following dimensional requirement establishment nc program, preparation cross-linked polrvinyl chloride foam core.Dimensional requirement: H
0=H, L
0=L/ (1+2%), W
0=W/ (1+2%), promptly cross-linked polrvinyl chloride foam core part height dimension H is identical with digital-to-analogue, and length L size and width W size are all dwindled by 2% expansion rate of digital-to-analogue size.
In the formula: H
0---machine adds back part height dimension
L
0---machine adds back part length size
W
0---machine adds back part width dimensions
H---digital-to-analogue height dimension
L---digital-to-analogue length dimension
W---digital-to-analogue width dimensions
The present invention requires the Digit Control Machine Tool process velocity to be not less than 40 meter per seconds in addition, and uses the hard alloy cutter cutting.
(2) with 3218 prepregs according to honest material under the appearance and size, for future use;
(3) use calico with cross-linked polrvinyl chloride foam core piece surface wiped clean, then the J-47B glue is brushed to be pasted of cross-linked polrvinyl chloride foam core, requiring glue-spread is 100 ± 10g/m
2, and at room temperature dry in the air to 5min～10min;
(4) 3218 prepregs that will descend are wrapped on to be pasted of the cross-linked polrvinyl chloride foam core part of brushing the J-47B glue successively;
(5) the cross-linked polrvinyl chloride foam layer part that will wrap up 3218 prepregs is placed in the shaping mould tire, and seal vacuum bag, then part and mould tire are together sent into and carried out co-curing in the pot arch, the technological parameter that solidifies is: vacuum pressure reaches-and begins to heat during 0.08MPa, heat to 70 ± 5 ℃ insulation 60min; Heat to 100 ± 5 ℃ insulation 60min; Heat to 130 ± 5 ℃, insulation 90min naturally cools at last and takes out part after the room temperature and carry out surfacing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105439727A CN102107537A (en) | 2010-11-15 | 2010-11-15 | Method for forming crosslinked polyvinyl chloride foam sandwich structure part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105439727A CN102107537A (en) | 2010-11-15 | 2010-11-15 | Method for forming crosslinked polyvinyl chloride foam sandwich structure part |
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| CN102107537A true CN102107537A (en) | 2011-06-29 |
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|---|---|---|---|
| CN2010105439727A Pending CN102107537A (en) | 2010-11-15 | 2010-11-15 | Method for forming crosslinked polyvinyl chloride foam sandwich structure part |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104149357A (en) * | 2014-08-08 | 2014-11-19 | 嘉兴市隆鑫碳纤维制品有限公司 | Method for manufacturing airplane ventilation door by using composite material |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1915650A (en) * | 2005-08-19 | 2007-02-21 | 上海之合玻璃钢有限公司 | Vacuum forming technique for sandwich structure piece of composite material of fiberglass-reinforced plastics |
-
2010
- 2010-11-15 CN CN2010105439727A patent/CN102107537A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1915650A (en) * | 2005-08-19 | 2007-02-21 | 上海之合玻璃钢有限公司 | Vacuum forming technique for sandwich structure piece of composite material of fiberglass-reinforced plastics |
Non-Patent Citations (1)
| Title |
|---|
| 黄世敏: "聚氯乙烯泡沫塑料夹芯结构玻璃钢船的探讨", 《玻璃钢/复合材料》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104149357A (en) * | 2014-08-08 | 2014-11-19 | 嘉兴市隆鑫碳纤维制品有限公司 | Method for manufacturing airplane ventilation door by using composite material |
| CN104149357B (en) * | 2014-08-08 | 2017-02-08 | 嘉兴市隆鑫碳纤维制品有限公司 | Method for manufacturing airplane ventilation door by using composite material |
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Application publication date: 20110629 |