SE185876C1

SE185876C1 -

Info

Publication number: SE185876C1
Authority: SE
Publication date: 1963-01-01

Description

Uppfinnare: H L Wheeler Jr FOreliggande uppfinning avser ett satt att framstalla en porOs vaggkonstruktion genom att tract f6rst lindas pa en dorn i pa varandra lagda tradlager med tradvarven i varje lager ph inbOrdes avstand och trhden i ett lager korsande traden i angransande lager, varefter traden i ett lager forenas med traden i det angransande lagret vid korsningspunkterna. Andamdlen med uppfinningen aro hi. a. fOljande. Inventor: HL Wheeler Jr. The present invention relates to a method of making a porous rock structure by first winding the funnel on a mandrel in superimposed wire layers with the wire turns in each layer at the distance between the wire and the wire crossing the wire in adjacent layers, after which the wire in a layer is joined to the thread in the adjacent layer at the intersection points. The spirit of the invention is hi. a. The following.

For det fOrsta att erbjuda ett salt att tillverka en poros vagg, som kan vara r8rformig eller som kan andras fran sin ursprungliga form till en symmetrisk form eller skaras och ombildas till en skiva. First, to offer a salt to make a porous cradle, which may be tubular or which may change from its original shape to a symmetrical shape or be cut and transformed into a disc.

For det andra att erbjuda ett salt att tillverka en poros vagg, vid vilken porernas storlek kan exakt regleras, sa att icke endast vaggkonstruktionen far jamn porositet utan porernas storlek, riktning och slingrande bana ocksa kan exakt forutbestammas for att passa speciella behov, dvs. porerna kunna ligga yinkelratt mot vaggytan, luta, variera i area eller vara av labyrinttyp. Secondly, to offer a salt to manufacture a porous cradle, at which the size of the pores can be precisely regulated, so that not only the cradle construction has an even porosity but the size, direction and meandering path of the pores can also be precisely predetermined to suit special needs, i.e. the pores can lie at right angles to the cradle surface, tilt, vary in area or be of the labyrinth type.

For det tredje att erbjuda ett salt att tillverka en poros vagg, som kan ha reglerat foranderlig porositet for att fOrutbestamma ett relativflode av fluida i olika omraden. Third, to offer a salt to make a porous rock, which may have regulated variable porosity to predetermine a relative flow of fluids in different areas.

Del for uppfinningen vasentligt utmarkande L., att en varmebestandig dorn med cirkelrund tvarsektion anvandes, pa vilken trhden lindas skruvlinjeformigt under spanning, sa att intim beroring astadkommes vid korsningspunkterna, och utsattes for varme, medan den fortfarande befinner sig pa dornen, for att astadkomma htminstone en delvis hopsmaltning av traden vid korsningspunkterna, varefter de salunda vid varandra fasta lagren avtagas shsom en enhet fran dornen, utsattas for tryck f8r att minska mellanrummen och Oka beroringsytorna vid korsningspunkterna och slutligen ateruppvarmas for att smalta fast traden Over i stort sett hela beroringsareorna. Part of the invention essentially marking L., that a heat-resistant mandrel with a circular cross-section is used, on which the wire is wound helically under tension, so that intimate contact is provided at the intersection points, and exposed to heat, while still on the mandrel, to provide at least a partial fusion of the wire at the intersection points, after which the thus fixed layers are removed as a unit from the mandrel, subjected to pressure to reduce the gaps and Oka contact surfaces at the intersection points and finally reheated to melt the wire Over virtually the entire contact areas.

Uppfinningen beskrives narmare i det foljande med hanvisning till bifogade ritning. The invention is described in more detail below with reference to the accompanying drawing.

Pa ritningen visar fig. ii mycket Overdriven skala en planvy av en del air en form av poros -Ogg konstruerad enligt uppfinningen. Fig. 2 visar en idealiserad sektion av samma vagg efter linjen 2-2 i fig. 1. Fig. 3 visar en liknande sektion av vaggen efter linjen 3-3 i fig. 1. Fig. 4 visar i f8rstorad skala en sektion av successiva skikt till den porosa vaggkonstruktionen. Fig. 5 visar en tvarsektion efter linj en 5-5 i fig. 1. Fig. 6 visar i forstorad skala en sektion lik fig. 2 men av en modifierad poros vaggkonstruktion med varierande porositet mellan sina tva ytor. Fig. 7 visar schematiskt en sektion air vaggkonstruktionens utseende, mar den ligger plan och anordnad med porerna lutande mot vaggkonstruktionens ytor. Fig. 8 visar en perspektivvy av en porOs bylindervagg konstruerad enligt uppfinningen. In the drawing, Fig. Ii shows a very exaggerated scale a plan view of some air a form of porous -Ogg constructed according to the invention. Fig. 2 shows an idealized section of the same cradle along the line 2-2 in Fig. 1. Fig. 3 shows a similar section of the cradle along the line 3-3 in Fig. 1. Fig. 4 shows on an enlarged scale a section of successive layer to the porous cradle structure. Fig. 5 shows a cross section along line a 5-5 in Fig. 1. Fig. 6 shows on an enlarged scale a section similar to Fig. 2 but of a modified porous cradle construction with varying porosity between its two surfaces. Fig. 7 schematically shows a section of the appearance of the cradle structure, but it lies flat and arranged with the pores inclined towards the surfaces of the cradle structure. Fig. 8 shows a perspective view of a porOs cylinder wall constructed according to the invention.

Vid utovandet av uppfinningen lindas en eller flera tunna spanda tradar pa en dorn, som har den fardiga produktens form eller en form, air vilken man kan erhalla det fardiga foremalets form. I huvudsak utgor en dylik dorn en rotationskropp, t. ex. en cylinder, kon eller en kropp med mera invecklad form, exempelvis en stryphylsa. Genom att reglera del satt, pa vilket traden lindas pa dornen, och reglera tvarsektionen hos sjalva traden kan en poros vagg konstrueras, vars porositet kan vara likformig eller om sit Onskas ojamn eller *graderad och forutsagbar i storsta utstrackning. In the practice of the invention, one or more thin buckets of wire are wound on a mandrel having the shape of the finished product or a mold in which the shape of the finished article can be obtained. Essentially, such a mandrel constitutes a rotating body, e.g. a cylinder, cone or body with a more intricate shape, for example a choke sleeve. By regulating the part set on which the wire is wound on the mandrel, and regulating the cross section of the wire itself, a porous cradle can be constructed, the porosity of which may be uniform or if its desired is uneven or * graded and predictable to the greatest extent.

Traden lindas pa en dorn, som kan motsta trhdmaterialets hopfastningstemperatur. Dorm% kan salunda framstallas av keramiskt material eller av metall och belaggas med ett keramiskt material eller behandlas pa annat satt, sa att dess yta joke faster vid traden. The wire is wound on a mandrel which can withstand the bonding temperature of the wire material. Dorm% can thus be made of ceramic material or of metal and coated with a ceramic material or treated in another way, so that its surface jokes sticks to the wire.

Dupl. kl. 7 d: 16 2 185"876 — trAdlager forskjutas. Foljdenatt ett fler= tal labyrintgangar bildas, vilka emellertid kunna vara jAmnt fordelade och forutbestambara till sin beskaffenhet. Denna konstruktionstyp ãr speciellt lamplig f8r porasa vaggar avsedda att anvandas sksom filter. Dupl. at 7 d: 16 2 185 "876 - wood layers are displaced. As a result, several labyrinthine entrances are formed, which, however, can be evenly distributed and predeterminable in nature. This type of construction is particularly suitable for porous cradles intended to be used as filters.

Det ãr ibland onskvart med varierande porositet fran den f5.rdiga produktens ena till dess andra sida. Detta kan b.stadkommas genom att Andra tvarsektionsformen hos traden, dä successiva lager lindas pa dornen. Delta kan ske under tradlindningen genom en successiv eller intermittent andring av installningen av utplaningsvalsarna, mellan vilka traden ledes. De forsta tradlagren kunna salunda vara platta, sasom angives vid 4 i fig. 6, och foljande lager mindre platta, tills det sista tradskiktet har fyrkantig eller rund tvarsektion, sasom visas vid 5 i fig. 6. It is sometimes desirable with varying porosity from one finished product to the other. This can be accomplished by the Second cross-sectional shape of the wire, where successive layers are wound on the mandrel. Delta can take place during the wire winding by a successive or intermittent change of the installation of the leveling rollers, between which the wire is guided. The first wire layers may thus be flat, as indicated at 4 in Fig. 6, and the following layers less flat, until the last wire layer has a square or round cross section, as shown at 5 in Fig. 6.

Man behiiver naturligtvis icke lagga porerna vinkelratt mot den fardiga va.ggens sidor fOr att astadkomma relativt raka porer. Genom Alt reglering av matningshastigheten kunna successiva tradlager forskjutas en aning, sa att den fardiga poren ligger i huvudsak tangentiellt, sasom angives av 6 i fig. 7 . I detta avseende âr det yid framstallning av en cylinder att marka, att porernas axlar kunna ligga bade tangentielIt och luta i riktning mot eylinderns ena eller andra ande. Of course, it is not necessary to lay the pores perpendicular to the sides of the finished wall in order to create relatively straight pores. By All control of the feed rate, successive wire layers can be shifted slightly, so that the finished pore is substantially tangential, as indicated by 6 in Fig. 7. In this respect, it is in the manufacture of a cylinder to mark that the axes of the pores can lie both tangentially and tilt in the direction of one or the other spirit of the cylinder.

Sasom ovan angivits, kan dornen, pa vilken den porosa vaggen formas, ha samma form som det fardiga foremfilet, forutsatt, att detta ãr en rotationskropp eller ungefarligen en sad.an, t. ex. en ellips eller polygon. As stated above, the mandrel on which the porous cradle is formed may have the same shape as the finished preform, provided that it is a rotating body or approximately a saddle, e.g. an ellipse or polygon.

Fig. 8 visar sasom exempel en cylindrisk form 7. I detta fall kan man genom att Andra tradmatningen under lindningen Andra den fardiga produkten, sa att man exempelvis vid konstruktion av en raketmotor kan astadkomma stOrre porositet i de omraden, I vilka en stOrre fluidumtillforsel onskas. Fig. 8 shows, by way of example, a cylindrical shape 7. In this case, by second feeding the finished product during the winding, the finished product can be said that, for example, in the construction of a rocket motor, greater porosity can be achieved in the areas in which a larger fluid supply is desired. .

Genom den forsta hopfastningen av tradarna inbordes kan man skara en poros cylinderVagg efter sintring och astadkomma en plan skiva. Dylika skivor kunna sedan skaras till vilken onskad form som heist. Through the first fastening of the trades on board, you can cut a porous cylinder cradle after sintering and create a flat disc. Such discs can then be cut to any desired shape.

Tradmetallen beror pa vad den porosa vaggen skall anvandas till. Salunda kan stal, koppar, titan, moIybden och legeringar, for att nu bara namna nagra fa material, anvandas Tor att passa speciella behov. Traden kan ocksa plateras eller belaggas pa annat satt. I detta fall behaver hopfastningstemperaturen endast vara tillrackligt hag for att smalta belaggningsmaterialet. Sa till exempel kan en farkopprad staltrad hopfastas eller hopsmaltas yid lagre temperatur an oplaterad staltrad. The wire metal depends on what the porous cradle is to be used for. Thus, steel, copper, titanium, molybdenum and alloys, to name just a few materials, can be used to suit special needs. The wire can also be plated or coated in another way. In this case, the bonding temperature only needs to be sufficient to melt the coating material. Thus, for example, a vessel-lined steel liner can be fastened or fused together at a lower temperature than an unflated steel liner.

Det är att mArka, att traden lindas under spanning, sa att en fast fysikalisk kontakt bi- behalles mellanvarandra fOlj ande tradla- ger. Det är detta kontakttryck, som sakerstaller tillracklig hopfastning mellan tradlagren under upphettningens gang. It is to be noted that the thread is wound under tension, so that a fixed physical contact is maintained between each other following layers. It is this contact pressure which causes sufficient adhesion between the wire layers during the heating process.

Sedan traden lindats for att astadkomma ett flertal skikt eller lager, utsattes dorm och trad for hopfastningstemperatur, varigenom tradlagrens snliggningsytor bringaS snialta samman under inverkan av tradspanningstrycket. After the wire has been wound to create a plurality of layers or layers, the dormer and wire are subjected to bonding temperature, whereby the sealing surfaces of the wire layers are brought together under the influence of the wire tension pressure.

Ehuru traden kan ha ett stort antal olika tvarsektionsformer, t. ex. cirkelformig, rektangular eller ellipsformad tvarsektion, har dot visat sig, att en relativt platt trad fir fordelaktig, exempelvis en tract, S0111 fir utplattad till farhallandet 2:1 mellan tjocklek och bredd. Detta kan astadkommas genom att traden le-des mellan valsar antingen fore lindningen eller under loppet av tradens lindning pa dornen. Den ,platta profilen astadkommer en maiimiarea, inom vilken de successiva tractlagren stit i presskontakt med varandra, och tillforsakrar alltsa en tillracklig area for hopfastning vid upphettning. Although the trade can have a large number of different cross-sectional shapes, e.g. circular, rectangular or elliptical cross-section, it has been found that a relatively flat wire is advantageous, for example a tract, SO111 is flattened to the distance 2: 1 between thickness and width. This can be achieved by guiding the wire between rollers either before winding or during the course of the wire winding on the mandrel. The flat profile provides a mime area within which the successive tract layers have been in press contact with each other, thus ensuring a sufficient area for fastening during heating.

Tradens tvarsektionsarea varierar alit efter den avsedda anvandningen och storleken pa den dorn, pa vilken traden lindas. Ju stOrre don desto grovre tract kan anvandas. Emellertid kan i alla fall ytterst tunn trad. anvandas. Sit till exempel kan man med framgang anvanda sig av 0,05 mm trad utplattad till 0,025 mm. The cross-sectional area of the wire varies according to the intended use and the size of the mandrel on which the wire is wound. The larger the don, the coarser the tract can be used. However, in any case, extremely thin trad. used. Sit for example, you can successfully use 0.05 mm wire flattened to 0.025 mm.

Det har visat sig lampligt att forst astadkomma en fOrsta hopfastning mellan tradarna mom att tradarna liggande pit dornen upphettas, varefter dornen avlagsnas, och den av traden bildade porasa vaggen utsattes for me: kaniskt tryck, aterupphettas och fardighopfastes. Traden kan ocksa lindas i cylindrisk form, sAsom visas i fig. 8, darefter Dforhopfastas», avlagsnas frail dornen och skaras pa langden, plattas ut till en skiva eller i ark-form och sedan ledas mellan valsar och upphettas pa nytt for att forstarka hopfastningen. It has proved expedient to first bring about a first fastening between the threads, in that the threads lying on the mandrel are heated, after which the mandrel is removed, and the porous cradle formed by the thread is subjected to mechanical pressure, reheated and fastened together. The wire can also be wound in a cylindrical shape, as shown in Fig. 8, then fastened together, the frail mandrel is removed and cut lengthwise, flattened into a disc or in sheet form and then passed between rollers and reheated to strengthen the fastening. .

Sasom ovan namnts kan traden lindas pa sig sjalv for att astadkomma ett stort antal olika porositetsfOrhallanden. Den. enklaste formen är kanske en tradlindning med likformig has- tighetoch tillbaka Over en roterande cylinder. Genona att reglera relativhastigheten far rotation och matning kunna pa varandra fOljande tradskikt staplas pa varandra pa shdant satt, att vertikala porer kunna bildas. Sasom visas i fig. 1, 2 och 3 kunna salunda enkeitradar 1 lindas, sa. att de astadkomma kanaler eller gangar 2 parallella med varandra och med den salunda framstallda vaggens sidor. Om tradarna laggas likformigt, kunna de bilda oppningar 3, som stracka sig vinkelratt mot de tvâ sidorna av den fardiga cylindern .eller annan rotationskropp. Porositeten regleras genom den delning, med vilken tradarna lindas. As mentioned above, the wire can be wound on its own to achieve a large number of different porosity conditions. The. perhaps the simplest form is a wire winding with a uniform speed and back over a rotating cylinder. By regulating the relative velocity, rotation and feeding can be successively stacked on each other. The following layers are stacked on top of each other in such a way that vertical pores can be formed. As shown in Figs. 1, 2 and 3, single radar 1 can thus be wound, sa. that they provide channels or passages 2 parallel to each other and to the sides of the rock-shaped cradle. If the wires are laid uniformly, they can form openings 3, which extend perpendicular to the two sides of the finished cylinder or other rotating body. The porosity is regulated by the division by which the trades are wound.

Det sfitt, pa vilket traden kan matas pa den roterande dornen, kan vara sit reglerat, att varandra foljande lager icke placera oppningalma i linje. Sasom visas i fig. 4 komma Opp- ningarna -3 icke att forbindas med varandra Torutom genom kanaleriw 2, ona successiva — —3 Sasom ovan framhallits, lindas traden hart spand, och som foljd harav ut5vas ett stort radiellt tryck mellan tradarna yid korsningspunkten. Denna spanning finns kvar i den fardiglindade konstruktionen, medan denna fortfarande ligger kvar pa dornen. Den forsta hopfastningen astadkommes genom att den lindade traden upphettas, medan den ligger kvar pa dornen, och trycket, som utovas genom tradspanningen, astadkommer det erforderliga trycket for att skapa en fast och saker forbindning vid arbetstemperaturen. Sedan konstruktionen borttagits frau dornen och hoppressats till en klenare dimension, deformeras tradstrackorna narmast den forsta hopfastningen eller forbindningen, och tradarnas kontaktarea okas eller vidgas. Eftersom traden faktiskt deformeras och fortfarande ar hart lindad, finnes tryck mellan tradytorna i de Rade kontaktareorna, och slutupphettningen medfor, att tradarna genom varme och radande tryck fastas ihop med varandra tillrackligt fast. Under den porOsa vaggens komprimering, sedan den borttagits frhn dornen, pressas tradarna i lagren Mare samman, och salunda bilda g annu trangre gangar An som forelag vid valsningens borjan och medgives en exakt reglering av produktens jamnhet och porositet. The space on which the wire can be fed on the rotating mandrel can be regulated in such a way that successive bearings do not place opening rings in line. As shown in Fig. 4, the openings -3 will not be connected to each other. Except through channels 2, which are successive, as indicated above, the wire is wound tightly, and as a result a large radial pressure is exerted between the wires at the intersection point. This tension remains in the pre-wound construction, while it still remains on the mandrel. The first fastening is achieved by heating the wound wire while it remains on the mandrel, and the pressure exerted by the wire tensioning provides the necessary pressure to create a firm and things connection at the working temperature. After the structure has been removed from the mandrel and compressed to a leaner dimension, the wire tracks are deformed closest to the first fastening or connection, and the contact area of the wires is increased or widened. Since the wire is actually deformed and is still tightly wound, there is pressure between the wire surfaces in the row contact areas, and the final heating means that the wires are fastened together sufficiently by heat and radiating pressure. During the compression of the porous rock, after it has been removed from the mandrel, the threads in the layers Mare are compressed, thus forming even narrower passages An which preceded at the beginning of the rolling and allow precise control of the evenness and porosity of the product.

Porositeten regleras salunda icke enbart genom den ursprungliga delningen och dimensionen hos tradarna i lindat skick utan ocksh. genom graden av komprimering eller hoptryckning. Om relativt svagt valstryck ut(was av valsarna, erhillles maximal porositet for en given ursprunglig traddelning, medan porositeten minskas i motsvarande grad, om valstrycket ar stort. The porosity is thus controlled not only by the original division and dimension of the trades in wound condition but also. by the degree of compression or compression. If relatively weak roll pressure out (was of the rollers, maximum porosity is obtained for a given original wire division, while the porosity is reduced correspondingly, if the roll pressure is large.

Ehuru det storre valstrycket lampligen ut+Was efter borttagningen fran dornen, kan en forsta valsning utforas, sedan den porosa vaggkonstruktionen sintrats men fortfarande ligger kvar pa dornen. Detta arbete syftar till att soka lossa den porosa vfiggkonstruktionen. Om en tunn keramisk belaggning anvandes pfi dornen sasom lossningsmedel kan detta krossas genom denna forsta valsning och sA- lunda annu mera underlatta den porosa ynggkonstruktionens borttagande. Although the larger roll pressure is suitably out + Was after removal from the mandrel, a first rolling can be performed after the porous rock structure has been sintered but still remains on the mandrel. This work aims to loosen the porous vfigg construction. If a thin ceramic coating is used on the mandrel as a release agent, this can be crushed by this first rolling and thus even more facilitate the removal of the porous rock structure.

Sasom tidigare i beskrivningen framhallits, mojliggor avstandet mellan enskilda tradvary och det inbordes laget for tradarna, som bilda successiva vary, en_ konstruktion ay en poros vagg med exakt den valda porositeten och stromningsmotstandet, dvs. med en given porositet kan stromningsmotstandet 8kas eller minskas alit efter forhallandet mellan successiva tradlager. As pointed out earlier in the description, the distance between individual tradvary and the inboard layer allows for the traders, who form successive vary, a construction ay a porous cradle with exactly the selected porosity and flow resistance, ie. with a given porosity, the flow resistance can be increased or decreased alit according to the ratio between successive wire layers.

Antingen en enda trad eller ett flertal tradar anyandas fir delningen vid tradlindningen sadan, att tradarna i successiva lager korsa varandra i stor vinkel, med WOW att den fardiga vaggkonstruktionen, exempelvis Bildern i fig. 8, far lamplig styrka bade i langdoch omkretsriktningen. Either a single thread or a plurality of threads eachandas for the division at the thread winding such that the threads in successive layers cross each other at a large angle, with WOW that the finished cradle construction, for example Bildern in Fig. 8, has suitable strength both in the longitudinal and circumferential directions.

Om en enkel trad anvandes, foljer att tea-den behover matas manga ganger langs dornen, innan rummen mellan de forsta tradvarYen kunna fyllas. Detta medfor givetvis, att tradarna korsa varandra vid periodiska punkter kings rotationskroppen. Varje Wining tjoeklek vid dessa punkter elimineras efter den forsta upphettningen och hopfastningen av tradarna genom att vaggkonstruktionen pressas eller ledes mellan valsar. If a single thread is used, it follows that the tea needs to be fed many times along the mandrel before the spaces between the first threads can be filled. This of course means that the traders cross each other at periodic points of the king's rotating body. Each Wining tjoeklek at these points is eliminated after the first heating and fastening of the trades by pressing the cradle structure or guiding it between rollers.

- Medan ett tradlager fylles eller fullbordas" genom att traden upprepade ganger matas lfings det avsedda formalet, fullbordas ocksa ett andra lager genom att traden varje gang den matas i ena riktningen ocksa matas tillbaka. Varje lager motsvarar en. rad av tradar, sasom visas I fig. 2, 3,5 och 6, dvs. det forsta lagret motsvarar bottenraden i dessa figurer och det andra lagret den andra raden. "While a trade stock is being filled or completed" by repeatedly feeding the trade to the intended purpose, a second stock is also completed by each trade also being fed back in one direction. Each stock corresponds to one. Row of trades, as shown in Figs. 2, 3,5 and 6, i.e. the first layer corresponds to the bottom row in these figures and the second layer to the second row.

Tradgrupperna med samma skruvlinjeform; som besta av summan av matningarna i ena riktningen resp. summan av matningarna den motsatta riktningen aro icke identiskt lika med de forsta och andra lagren, speciellt icke sedan den salunda bildade vaggkonstruktionen hoppressats; dvs. de delar ay tradarna, som bilda den ensartat skruvlinjeformiga tradgruppen i framriktningen, ligga over den ensartat skruvlinjeformiga tradgruppen i returriktningen och pressas salunda in i det andra lagret, och liknande delar av den ensartat skruvlinjeformiga tradgruppen i returriktningen pressas in i det forsta lagret. Genom inpressningen deformeras varje trad, dar den byter Iran .ena till andra lagret, medf8rande en okad vidhaftning vid dessa fordelade punk-ter efter den slutliga upphettningen och hopfastningen. Under tradens fortsatta lindning bildas ytterligare par av tradlager. The line groups with the same helix shape; as the best of the sum of the feeds in one direction resp. the sum of the feeds in the opposite direction is not identical with the first and second layers, especially not after the rock formation thus formed is compressed; i.e. the parts of the threads which form the uniform helical thread group in the forward direction lie over the uniform helical thread group in the return direction and are thus pressed into the second layer, and similar parts of the uniform helical thread group in the return direction are pressed into the first layer. By the indentation, each thread is deformed as it changes the Iran to the other layer, resulting in an increased adhesion at these distributed points after the final heating and fastening. During the continued winding of the wire, additional pairs of wire layers are formed.

Det forhaller sig givetvis sa, att delningen under tradens lindning fram och tillbaka kings domen maste Andras till noll och kasta om vid varje finde, med pafoljd att det blir en »uppbyggnach vid rotationskroppens andar. Om den resulterande minskningen i porositet i dessa andpartier ar olamplig i slutprodukten, kunna dessa delar skaras bort efter sintring. Emellertid svetsas eller fastas dessa andar i mfinga fall vid andra delar, och bristen, pa porositet och motsvarande Rade tat-het och styrka fir fordelaktig. It goes without saying, of course, that the division during the winding of the thread back and forth the king's judgment must Andras to zero and turn over at every pimple, with the consequence that it becomes a "build-up to the spirits of the rotating body. If the resulting reduction in porosity in these duck portions is unsuitable in the final product, these parts may be cut off after sintering. However, in some cases these spirits are welded or fastened to other parts, and the lack of porosity and the corresponding radii and strength are advantageous.

Det fir givetvis n5dvandigt, att den pa dornen lindade porosa vaggformens andar bibehalla sitt lage och icke forskjutas axiellt. Om lindningens delningsvinkel understiger 0, racker friktionsber8ringen mellan trad och dorn att forhindra axiell tradforskjutning. It is, of course, necessary that the spirits of the porous rock form wound on the mandrel maintain their position and not be displaced axially. If the angle of inclination of the winding is less than 0, the frictional contact between the wire and the mandrel racks to prevent axial wire displacement.

Vid tradens lindning med delningsvinkeln stOrre An 0 maste man emellertid leda traden som en kord Over dornanden. Kordbanans lage fir sadant, att den ay den motstaende bA- genomfattade Vinkeln ar lika med dubbla del- 4— ningsvinkeln. Genom att pa detta satt linda andarna av den form, som bildar den. porOsa vaggen, kan delningsvinkeln vara 60° eller om man sa onskar annu storre. En delningsvinkel pd. 0 ger den fardiga porosa vaggformen lika stor styrka i langd- och omkretsriktningen. Om stone vinkel an 45° anvandes, blir styrkan i langdriktningen storre an i omkretsriktningen. Den porosa vaggens hallfasthetsegenskaper kunna salunda regleras for att passa speciella behov. However, when winding the wire with the pitch angle greater than 0, one must guide the wire like a cord over the mandrel. The position of the cord path is such that the angle at the opposite base is equal to the double dividing angle. By doing this, the spirits of the form that forms it wrap. porOsa cradle, the pitch angle can be 60 ° or if you want even bigger. A division angle pd. 0 gives the finished porous rock shape equal strength in the longitudinal and circumferential directions. If a stone angle of 45 ° is used, the strength in the longitudinal direction will be greater than in the circumferential direction. The porosity properties of the porous cradle can thus be adjusted to suit special needs.

Ehuru man icke behover linda Over dornanden eller Over en ansats pa domen, om delningsvin.keln är mindre an °, har det visat sig, att jamnheten blir battre om detta utfOres, sfirskilt vid lindning av former med storre diameter. Although there is no need to wrap over the mandrel or over an approach to the judgment, if the angle of division is smaller, it has been found that the smoothness is better if this is done, especially when winding larger diameter molds.

Claims

Patent claim:

1. Set to produce a porous rock construction by first winding the wire on a mandrel in stacked wire layers with the wire turns each layer at mutual distance and trade. In a layer crossing the wire in adjacent layers, after which the wire in a layer joins the wire in the adjacent layer at the intersection points, characterized in that a heat-resistant mandrel with circular cross-section is used, on which the wire is wound helically under tension, so that intimate touch is effected at the intersection points, and exposed to heat while still on the mandrel, to effect at least a partial fusion of trade. at the intersection points, after which the thus adjoining bearings are removed as a unit from the mandrel, subjected to pressure to reduce the gaps and Oka contact surfaces at the intersection points and finally reheated to narrow the wire Over Virtually the entire contact areas.

2. Set according to patent claim 1, characterized in that the wire turns in alternating layers are laid radially in line with each other, whereby radially directed pores are formed throughout the cradle construction.

3. Set according to patent claim 1, characterized in that the wire turns in alternating layers are gradually displaced from their radial direction, whereby obliquely directed or labyrinth pairs are formed throughout the cradle construction.

4. A set according to claim 1, 2 or 3, characterized in that the rock structure formed on the judgment is cut open, after which said pressure is exerted by feeding the rock structure Indian rotating rollers. Request publications: Patent papers [ran Norway 82 734; United Kingdom 697 908.