SE125186C1

SE125186C1 -

Info

Publication number: SE125186C1
Authority: SE
Publication date: 1949-01-01

Description

Uppfinnare: F. E. Taneeek. Inventor: F. E. Taneeek.

Vissa metallartiklar, sasom t. ex. sadana projektiler for hog hastighet, vilka aro avsedda att fa sin maximala tvarsektionsdimension reducerad genom deformation under sin passage genom det koniska loppet i ett eldvapen, varigenom forbattrade hallistiska egenskaper erhallas, besta av en kropp, som lampligen är urborrad far att fyllas med en hagexplosiv laddning, och en gardel, vars kant har formen av en stympad kon. Den sa utformade kanten ar forsedd incd urskarningar for att den latt skall deformeras under projektilens passage genom eldvapnet. Nor-malt utfores projektilkroppen av stál, som har en relativt hog straekgrans (t. ex. 63 kg per mm') och hr relativt hart, I. ex. ett stal mcd Brinelltalet omkring 260. A ,andra sidan utfores gordeln, far att den latt :skall deformeras, av en mjukare metal', som t. ex. bar en strackgrans pa 28-31 kg per mm2 och ett Brinelltal pa 120-150. Some metal articles, such as e.g. such high-velocity projectiles, which are intended to have their maximum cross-sectional dimension reduced by deformation during their passage through the conical barrel of a firearm, thereby obtaining improved hallistic properties, consisting of a body which is suitably drilled may be filled with a barge explosive charge. , and a girdle, the edge of which has the shape of a truncated cone. The edge so designed is provided with indentations so that it can be easily deformed during the passage of the projectile through the firearm. Normally the projectile body is made of steel, which has a relatively high straight line (eg 63 kg per mm ') and is relatively hard, I. ex. a steel mcd Brinell number around 260. A, on the other hand the belt is made, so that it is easily: to be deformed, of a softer metal ', which e.g. wore a stretch limit of 28-31 kg per mm2 and a Brinell number of 120-150.

Vanligen farenas projektilkroppen och gordein antingen genom nagot slags fog med fals och spar eller genom svetsning. I varje fall Or operationen med sammanfogning av de tva delarna ej endast dyrbar och tidsadande utan naturligtvis blir aven godstjockleken vid fogen onodigt stor. Enligt foreliggande uppfinning utfores ett enhetligt amne sa, att olika delar av detsamma fa olika hardhetsgrad, vilket ernas darigenom, att ett sadant langstrackt amne framstalles, vilket bestar av en den egentliga kroppen bildande del och en basdel, vid vilket farhallandet mellan basdelens och kroppens tvarsnittsytor Or stOrre an ett, och vid vilket detta forhallande okats genom att kroppen genom t. ex. borrning f or-setts med en ihalighet, att detta amne inf 6- res i en matris, som liar sadan tvarsektion, att kroppen fritt ken rara sig at sidorna men icke basen, och att amnet vikl rumstemperatur utsattes far ett mot detsammas andytor verkande tryck, varigenom kroppen minskar i langd, samtidigt som den utvidgas i sidoled. Usually the projectile body and curtain are removed either by some kind of joint with seams and rafters or by welding. In any case, the operation of joining the two parts is not only expensive and time consuming, but of course the thickness of the material at the joint also becomes unnecessarily large. According to the present invention, a uniform blank is made so that different parts of the same have different degrees of hardness, which is due to the fact that such an elongate blank is produced, which consists of a part forming the actual body and a base part, in which the spacing between the base part and the body cross-sectional surfaces Or larger than one, and at which this relation is increased by the body through e.g. drilling is provided with a cavity, that this blank is inserted into a matrix, which has such a cross-section, that the body moves freely to the sides but not the base, and that the blank is exposed to room temperature at a pressure acting against the same surfaces. , whereby the body decreases in length, at the same time as it expands laterally.

En utforingsform av uppfinningen visas a Ihifogade ritning. A denna visar fig. 1 en sektion av ett amne i en matris, innan amnet utsatts flir tryck, och fig. 2 samma sektion, sedan amnet utsatts for tryck. An embodiment of the invention is shown in the accompanying drawing. In this, Fig. 1 shows a section of a blank in a matrix, before the blank is subjected to pressure, and Fig. 2 shows the same section, after the blank has been subjected to pressure.

Ett amne av mjukt stal, ungefar 12 cm langt och med ett Brinelltal pa ungefar 1 —150, tit:fares sa, att det far formen ay en cylindrisk huvudkropp 1 med konstant tvarsnitt (2,5 cm diameter) och en basdel 3, som har en storre tvarsektionsarea an huvudkroppen 1. Amnet or till att borja med ;solitt men underkastas en axiell borrningsoperation for avlagsnande av det inre 5 av huvudkroppen. Genom denna borrningsoperation Mir praktiskt taget hela den namnda huvudkroppen ett cylindriskt skal. A blank made of mild steel, about 12 cm long and with a Brinell number of about 1-150, tit: fares so that it takes the form of a cylindrical main body 1 with a constant cross-section (2.5 cm diameter) and a base part 3, which has a larger cross-sectional area than the main body 1. The blank is to begin with; solid but subjected to an axial drilling operation for removing the interior 5 of the main body. Through this drilling operation Mir practically the entire said main body a cylindrical shell.

Darefter infores amnet i en matris 7 av hardat stal, som oinsluter huvudkroppen langs hela dess langd, men har nagot stone tvarsektionsarea (t. ex. 3,14 cm i diameter). Den nedre delen av matrisen 7 omsluter emellertid tatt basen 3 av amnet, sasom visas i fig. 1. Matrisen i sin helhet placeras i en lamplig hallare 9, som har en hardad bottenplatta 11. Medelst en hardad staldorn 13 utavas tryck mot amnets avre yta. Delta tryck Or Mgt (t. ex. 86 kg per min") och sadant, att den ihaliga delen 1 av amnet utvidgas i sin tvarsektion, sa att den fyller matrisen men markbart reduceras till sin la.ngd. Reduktionen km, t. ex. uppga till ungefar 20 % av kroppens ursprungliga langd, sasom torde framga ay en jamforelse mellan figurerna 1 och 2 pd. ritningen. Under trycket deformeras materialet i amnet permanent genom rorelse i glidplanen inom de olika kristallerna, och darigenom akas materialets hardhet och strackgrans i huvudkroppen, d. v. s. materialet kallhardas. Omfattningen av hardningen i materialet i ett amne av en total langd pa ungefar 12 cm hr sadan, att Brinelltalet hojes till ungefar 260. Then the blank is inserted into a matrix 7 of hardened steel, which does not enclose the main body along its entire length, but has some stone cross-sectional area (eg 3.14 cm in diameter). However, the lower part of the matrix 7 encloses the base 3 of the blank, as shown in Fig. 1. The matrix in its entirety is placed in a lamp holder 9, which has a hardened bottom plate 11. By means of a hardened stable mandrel 13 pressure is applied to the lower surface of the blank. . Delta pressure Or Mgt (eg 86 kg per min ") and such that the hollow part 1 of the blank is expanded in its cross section, so that it fills the matrix but markedly reduced to its length. The reduction km, e.g. give up to about 20% of the original length of the body, as should be seen in a comparison between Figures 1 and 2 of the drawing. The extent of the hardening of the material in a blank of a total length of approximately 12 cm is such that the Brinell number is increased to approximately 260.

Efter denna lokala hardning av huvudkroppen 1 av amnet urholkas basen 3 genom lamp-hg maskinbearbetning och forses dess perife- 2— — ri wed mot kanterna oppna spar i avsikt att Id denna del av den salunda utformade snabbprojektilen att verka som den deformerbara b aordeln. Darefter utfores en maskinbearbetning av kroppens inre ytor, sa att kroppen kan fyllas med en. hogexplosiv laddning. Denna maskinbearbetning utfores sa, att i ett langdsnitt huvndkroppens innervagg far parabolisk form, varfor den. effektiva godstjockleken i denna del vaxer fran anden mot gordeln. After this local hardening of the main body 1 of the blank, the base 3 is hollowed out by lamp-hg machining and its periphery 2— - ri wed towards the edges is forced to open grooves in order for this part of the saloon-designed rapid projectile to act as the deformable beam. Then a machining of the inner surfaces of the body is performed, so that the body can be filled with one. high explosive charge. This machining is carried out in such a way that in a longitudinal section the inner cradle of the hood body has a parabolic shape, which is why it. the effective wall thickness in this part grows from the spirit towards the belt.

Ehuru en sammanpressning pa ovan beskrivet satt i allmanhet torde racka for att kallharda ett amne, kan det dock handa, att amnen av vissa stalsorter ej fullstandigt utfylla matrisen i en operation, i vilket fall sprickor kunna konstateras pa amnets utsida. For att undvika detta kunna amnena utsattas for tryck I tva steg, forst i en matris, som ar 2,5 mm storre i diameter an den onskade slutliga diametern, vid ett tryck av ungefar 55 kg per nine och darefter i en normal matris vid eft tryck av 86 kg per mm2. Although a compression on the one described above is generally sufficient to cold-harden a workpiece, it may be that the workpieces of certain steels do not completely fill the matrix in an operation, in which case cracks can be found on the outside of the workpiece. To avoid this, the blanks can be subjected to pressure in two steps, first in a matrix which is 2.5 mm larger in diameter than the desired final diameter, at a pressure of about 55 kg per nine and then in a normal matrix at pressure of 86 kg per mm2.

Av det anfOrda torde framga, att, da. den beskrivna metoden mojliggor framstallningen av huvuddelen av en projektil for hog hastighet Iran ett ,enhetligt amne av metall i motsats till forut kanda metoder, dar projektilkroppen och gordeln framstallas separat och sedan sammanfogas, foreliggande uppfinning i huvudsak innebar en metod att av ett enhetligt Mime framstalla en metallprodukt, vars olika delar hava olika hard-het s gr ad. From the foregoing it should appear that, da. the described method enables the production of the main part of a high velocity projectile in Iran, a uniform substance of metal as opposed to prior art methods, where the projectile body and the belt are produced separately and then joined together, the present invention essentially involved a method of producing a uniform Mime a metal product, the different parts of which have different hardness s gr ad.

Claims

Patent claim:

A process for the preparation of a uniform metal name of a. product, the different parts of which have different degrees of hardness, may be characterized by the fact that such an elongated anme is produced, which consists of one the actual body. forming part (1) and a base part (3), in which the ratio between the base part and the body (1) cross-sectional areas is larger than one, ooh in which this ratio is increased by the body (1) through e.g. harming is continued with a persistence (5), that this Lune infOres In a matrix (7), which has such a cross-section, that the body (1) can move freely at the sides but not the base, and that the substance at room temperature is exposed f Or ett mot the action of the same surfaces, whereby the body (1) decreases in length, at the same time as it expands laterally, while the base part (3) does not expand laterally.

A method according to claim 1, characterized in that the blank is compressed in a single step.

A method according to claim 1, characterized in that the arane is compressed in two steps, the degree of compression being less in the first step On in the second.

A method according to claim 3, characterized in that the pressure is provided by a hardened barn mandrel (13), which acts against one end of the blank, while the opposite spirit rests on a hardened stand.], Plate (11). Stockholm 1949. Kungl. Eoktr. P. A. Norstedt & Siiner 490089