DE1949840A1 - Composite article - Google Patents

Description

Patent attorneys Dipl.-Ing. R. Beetz u, Dipl.-Ing. "LamprecM 1949-840

Mönchen 22, Stelrwdoristr. 10.

293-I4.98OP October 2, 1969

NATIONAL RESEARCH DEVELOPMENT CORPORATION London (Great Britain)

Composite article

The invention relates to composite articles and methods of making them.

A composite material in which a fiber reinforcement such as Glass fiber in a hardened synthetic resin base material is generally used. A more extensive use of such a material was made possible by the difficulty prevented the full strength and stiffness capacities of the fiber reinforcement in such a material to reach. Welter also have the resistance properties Such materials limit their use to wear, high temperature and chemical attack.

.293- (JX 3X33 / O5) -TpP (7),

00981S / 1637

Dsr lrfinduBg is based on the task * of an improved Composite material made from a synthetic heart sit a faeezYevetärknng as well as a method of manufacture gel ehe χ- Stgenstäßde υ »create« η.

This object is achieved by a erfindungsgeaiäS Composite article made from one of a hollow shell or coating surrounded by grain made of synthetic resin old fiber coating. Strengthening o

The fiber reinforcement comprises carbon fibers of high strength and high modulus of elasticity of the type described in British publication 1 110 791, and the synthetic resin can be a Spozj- _? Polyester, polyamide or oil anchors, which are cured by applying heat and / or by using a suitable hardener and catalyst.

A method of making a composite article According to the invention consists of the impregnation of a fiber reinforcement material with unhardened Synthetic resin, the partial hardening of the synthetic resin to create a surface mixture of synthetic resin and Paser and then rubbing the yerbundia mixture under pressure through a Bübo into a hollow shell to generate a Composite article from one of a hollow shell Surrounded core made of partially hardened synthetic resin with Jasery © r reinforcement.

The outer "and / or the jacket may Xtmenquersehaltt Terschiedene shape Eg Z- _f E-, S- or X-Quersehnittfora have.

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! 949840

As a precaution, the jacket is made of metal, e.g. B. an aluminum standardization. Such composite structures can be used as stiffening struts to stabilize and consolidate a sheet metal structure.

The composite objects can be calibrated. B. by bending Before the final hardening, adjust the net content, insert them into a construction, or the final hardening can be completed immediately after filling Torgenoaeen be.

A further process sar production of a bandage material item according to the Srfindang consists of the Ieprtgnitrtn tines strand aas? AeerTeretärkungswerketoi £ ■ 1t attached to Kansthars, partial hardening of the synthetic resin sar creation of a tarbund strand, inserting the composite strand into a block of extruded metal - and the composite strand from a hydraulic extrusion press siir production of a composite material object flows from a fiber reinforcement in a partially cured KunetliarBeatrix-containing core, which is at least partially encased in metal.

The liquid through which the hydrostatic extrusion pressure is exerted may consist of uncured artificial hair.

Provided into such a composite article the fiber-reinforced synthetic resin core provides the main longitudinal strength and stiffness, and the jacket provides a major portion of the strength properties in the transverse direction of the article.

009815/1637

In one example of the invention, carbon fibers 7 microns in diameter and of the type described in British Patent 1,110,791 were impregnated with an equal amount of a solution comprising a thermosetting epoxy resin dissolved in acetone solvent and containing boron trifluoridamine complex as a catalyst. The impregnated fibers were then cured by heating at about 100 ⁰ G for 30 minutes in part, been driven whereby the solvent and a composite mixture revealed with which one could easily handle.

The mixture was then placed in an extruder. A length of ice-shaped aluminum tubing was attached to the nozzle exit side of the muzzle and the mixture was then injected through the nozzle to fill the tube. The effect of forcing the mixture through the nozzle is to orient the fibers generally parallel to the longitudinal direction of the Hohree. The mixture in the tube is known in the art as "undercured pre-preg ^B ". The object formed in this way from an aluzainium tube filled with "underhardened gate impregnation agent" can e.g. B. bring into a required shape by bending.

The hardening of the synthetic resin content of the "under-hardened Yorimpregnation Compound ^B is effected by heating the object to 1GO ⁰ G for 30 minutes.

The jacket can be τοπ irregular cross-section, and in a further example «r sus consists of a resp. a hollow threaded screw or bolt with a longitudinal » axial bore reinforced with a core made of fibers

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cured synthetic resin is filled. You screw or the Bolt is produced by any known manufacturing process, carries the thread and in the pail of a screw the screw head and is designed with a hollow shaft or subsequently drilled out to make the hole for the To create core. If a unidirectional reinforcement parallel to the 3jangsach.se of the screw is used such a screw has a very good strength behavior, since the ends of the composite core are unloaded and therefore no exposure concentration in this otherwise vulnerable zone occurs. Bas strength-to-weight ratio such a composite screw is such that a Screw or bolt the same weight as aluminum alloy screws or bolts approximately the same strength as a screw or a bolt of the same Dimensions made of steel have »This weight saving is of particular importance in the field of aircraft technology.

The invention is illustrated using two in the drawing Examples of execution explained in more detail; in this demonstrate:

Fig. 1 is a side section through an embodiment ungsbeispielj

FIGS. 2 and 5 are side sections of the second exemplary embodiment;

4, 5 and 6 are sectional views along the cutting lines IV-IV, V-V and VI-VI in Fig. 3j

and ■ .. '■■■

7 shows a lateral section of the rope.

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- βίο S ¹ Ig. 1, the lower part of a hydrostatic extruder comprises a hollow cylindrical component 11 which carries a pormbloclc 12 with a circular cross-sectional mouth 13. A strand of carbon fibers of the type described in British patent specification 1111 is impregnated with an equal amount by weight of a solution of thermosetting epoxy resin which is dissolved in acetone solvent and contains boron trifluoride-amine complications as a catalyst. The impregnated strand 14 is then open for 30 minutes 10O ⁰ O heated to effect partial hardening »The strand is then inserted into a hole in a block made of soft aluminum alloy 16 and placed in the press. Then hydrostatic pressure is exerted using liquid eposy resin 17 as an erectile liquid. Thus, a composite material object is extruded through the mold, which has a circular cross-section hollow aluminum foil 18 which surrounds partially cured synthetic resin 18 with carbon fiber reinforcement. The subsequent final curing of the synthetic resin is carried out with the application of heat.

In the pig. 2 and 3 is a compression molding assembly for ! Compression molding of a compressor lilgels from four upper ones ! rush 21a, 22a, 23a and 24a and corresponding animal Subdivisions 21b, 22b, 23b and 24b shown where the Ropes 21a and 21b are heated. A lorm cavity 21c is formed between the ropes 21a, 21b and is predominantly of the same cross-section as a length of the supply ¥ on jacketed terbund material, which in this Palle is designated 29 in Pig. 4. The Pormh cavity 21c is expanded at 21d to accommodate a plügelfußendebund, as will be described later.

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The upper and lower parts 22a and 22b are hinged to bind, to swing under the influence of an intriebequelle at 25 among other things sparked 26, 27, and designed so that they in the closed state, as shown in FIG. 3, a mold cavity 22c with the dimensions of a compressor blade define.

i) the upper and lower ropes 25a and 23b comprise bow-shaped dies, exactly between parts 22a, 24s and 22b, 24b fit and can be driven by a drive source 28 Bind

The upper and lower parts 24a and 24b are heated and define a mold cavity 24c therebetween the same shape as 22c and with an enlarged cavity 24cl corresponding to 21d.

For a compression molding EykJus, the two parts 22a, 22b eur open position 'swung open, as in Fig. 2 shown is, and the upper column 21a Me 24a. Bind τοπ den lower parts 21b to 24b removed, line length dee Replenishment from a metal jacket 29 with a core 30 from partially cured thermosetting resin with Fiber reinforcement is provided with a blind end 31 (Fig * T) Mistake. The replenishment is in the lower half of the Cavity 21c inserted with the blind end fitting into the lower half of the enlarged cavity 21d * The upper and the lower part are closed and the heated mold parts 21a, 21b liquefy the synthetic resin content of the drawer in cavities 21c and 21d *

The mold is now opened and the Hachsehub advanced,

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until the blind end 31 fits the enlarged Fonnhöhlung 24d. A wing root end collar [32 is attached to the supply to to match the cavity 21d. You mold parts are now closed, as shown in FIG. 2, and it goes without saying that a part of the replenishment, which was previously in parts 21a ,. 21b is now in parts 22a, 22b. You pan ν parts 22a, 22b now become that shown in FIG Closed position, and the fluid pressure passed by As the liquid synthetic resin is developed, the metal shell which starts to deform the shape of the mold cavity 22c to accept. Any excess resin will deform the dumbbell between the arch form stamps 23a »23b, which against a Control pressure from the drive source 28 are driven apart. In this state, the mold cavities 21d, 22c are not completely filled by the partially deformed supplies, and this is shown in FIGS. 5 and 6 shown where there are still empty voids at 4-1 f 51 and 61 there. The control pressure on the arch form stamps is now increased to further deform the dumbbell and to fill these empty cavities 41, 51 and 61 as well as the dumbbell in the prongs, as at 33 in the foot end collar 32, to drift.

The mold is reopened, which is in the cavity 22c formed article is advanced to cavity 24c and the cycle is repeated.

The molded article is, while it is in the cavity 24c is · heated to a temperature sufficient to effect the hardening of the synthetic resin. To stop To avoid the cycle while curing is in progress, additional cavities such as 24c can be provided, too which the molded part of 24c from gradually from

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1349840

Sm Höiilttng TorgerSelct will ana Iq welc & ett die wel

service required.

to finish the terfalireri zn, it is necessary, the eggQter the length · ά «β Saakßoiittbs diircii attachment of a blind end, which is the aimlicii shown in Fig. 7, jedocii. a Biapiirageaendabscliltiö aafweisfc that deforms is used to start the process of building artifacts, if the iormatiuipel 23a, 25b are operated.

009815/163?

Claims (1)

from a τοπ a ffofclmantel CfB beif. 29) or given Ekea {% 9 bsw. Eunetiiars with 2. Segerüetaiiä nacii Ακβρηιοίι 1 _f ctacLurcii gekeQnzeIciiii # t _r die SsserrerstäEkaiig Eofelefesern naifaSt. 3 »GegeQBtasdl naeii Asspmck 1 oil sr Z _r äaiuircli gek: encz, elciinef; _r that iss EEnstiiaxz an _{epoxy- F} Eoljestei ^ -j Folylmiä- or includes. ■ - - '~ - - 4-> object NACIL addressed i _r 2 or 5 _t äadurek gekenndaß eggs Ho & lmanteX (13 Izv. 29} or coating 5) TttsfaiEraEE zer HerstellEisg "Ises ferbnniwerfcstoffgegeiistaßäes _f äadarcii gekeRQzeiciinet _f that FaserYerstärJcungewerksfeoff nlt öögehäEteteia lansfeharss impregnated the Iitpregnleriiars aur Scisffang © JLser FirbiindiiiieciiiiEg from Eimstiiars and Faserwericstoff fcellweise ausiisrtet and a batch of TeEbiindmisciiung Ueter Briicic darcii a nozzle into a EoalBiantel zut formation of a" Composite material objects have a core tof ttil «tif ·» UÄgeiiSrteteiE artiiarc with fiber reinforcement ...;. · ■ - .; ';■'.'"■ - ■. ■ .. 6 «Terfaiirett sur HereteHung of a composite material object sendSf dadurck labeled, äaß'nan one strand Made of ZeserTers suspension material with inaccurate Eunetiiaris Impregnated, the synthetic resin used to create a terbund strand 0098l5 / 'i: € 37 - ■ ■ * - ■ - t · partially hardens, insert the composite strand into a hole in introduces an extrudable metal block, inserts the metal block with the composite strand into a hydrostatic extruder and the metal with the composite strand au8 the press to form a composite article from a τοη a hollow dumbbell surrounded core from partially Cured synthetic resin with fiber reinforcement, extruded. 7 «Method according to claim 5 or 6, characterized in that that aan the synthetic resin hardens. 8. The method according to claim. 6, characterized in that the Synthetic resin is kait-hardening and contains a suitable catalyst and hardener to effect the hardening. 9. The method according to claim 5 or 6, characterized in that that the composite article using heat and bridge onto the item in a heated compression molding press is required. 10. The method according to claim 9, characterized in that the object is formed in a multi-stage forum, the first heated stage, in which a length of composite material for liquefying the artificial hardness is contained is heated, a second stage to which the length is then conveyed and in which it is de- ίalored, and includes a third stage into which the Length after conveyed and in which it is heated for the purpose of curing the resin content of the object.