DE1458311A1 - Process for the production of semi-finished zinc products with improved deep-drawability - Google Patents

Description

DR.-ING. BY KREISLER DR.-ING. SCHÖNWALD 1458311 DR.-ING. TH. MEYER DR. FUES

COLOGNE 1, DEICHMANNHAUS

August 12, 1968 Ke / Ki

Aktiengesellschaft für Zink-Industrie vorm. Wilhelm Grillo, Duisburg-Hamborn

Process for the production of zinc semi-finished products with improved Deep drawability

The manufacture of semi-finished products made of zinc, mainly in sheet metal or strip form, with suitable materials that remain the same over a long period of time technological properties, in particular constant deep-drawability, has hardly been possible until now.

First and foremost, the technological properties change due to crystal recovery or recrystallization even at very low temperatures, some of which are even at normal room temperatures. Another cause for the occurrence of fluctuating technological properties lies in the fact that zinc falls into the group of hexagonally crystallizing metals and practically only the base surface appears as a sliding surface.

From the crystallographic processes during cold working we know that the latter can either be linked to a slip or to the formation of twins in the crystal. To what extent a pure slip or a pure twinning or a combination of both processes plays a role in cold forming, and has been different from metal to metal known only in relatively broad outline. In the case of zinc in particular, it has not yet become known that the presence of of twin crystals on deformability

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8 0 9 8 0 5/1123

of zinc can have a very important influence. Part of this may be due to the fact that there is a twin structure in the Zinc is very unstable in terms of its temperature resistance. With the previously known types of zinc, as they are for the Semi-finished products are common, occurs a crystal recovery respectively. Recrystallization even at very low temperatures on and changes in crystal structures in the sense of a disappearance of twins, mostly at moderate increased room temperatures. It has now been found that with zinc a previously completely unknown, but in its technological The effect of a very significant relationship between a twin structure and deformability exists and that there is the possibility of stabilizing a twin structure with regard to its temperature resistance.

The invention relates to a process for the production of zinc semifinished products, mainly in sheet metal and strip form, with deep-drawing ability that remains the same over a longer storage time using conventional shaping processes, which is characterized in that a small amount of impurities in the order of magnitude of copper, titanium, Zinc containing aluminum, magnesium, manganese, iron, chromium and / or nickel is initially converted into a suitable semi-finished product while warm with stitches over 20% and then cold-formed with a decrease of K to 7 %.

For the production of deep-drawn parts from zinc strip, one usually has a fine zinc with a fineness level of $ 99 * 995 which contains lead, cadmium, tin or iron as impurities. Such a band is mostly based on strengths of 1 mm and thinner down to 0.1 mm rolled down and out of it Deep-drawn parts made of cup-like shape.

8098Ü5 / 1123

When pulling such parts it has been observed that they are so good and ' bad deformabilities nitoinandor alternated, although Chemically the same materials are present 'And there was no difference in the data transmission had · Braider one and the same production process nit good trainability alternated with such exceptionally poor deep vision. Veiter was sent off, that dander, which immediately after, the manufacturing guto Tiefaiehoigonscharten exhibited, after, shorter vein lunge bearing sides oica so veriäid that sio their sixths again lost.

Attempts by the Annelderin raise, however good Schiftcn then received in the hearing of zinc semis According to the netallosraphiacher door investigation, twin structures are created iÄ'don zinc bands occur. In the event of deviation from Zwillincon cincts the drawability so far that a « next © use for deep drawing is xmiaüslich. Ta has eich shown, daco dio Thornoatabilitat dos Zvillinco & ofügoa is very cerirtg. Already with stock pages from some! Hagen oäer in the case of coringan increase in temperature a ready after occurs in zinc bands of the bokarjater type ait twin structure a change dco KrlatallnefUgoa in the sense of a twinning: · Kit dea disappearance of the twins, I immediately change the Ciaf » with suitable alloying additives to zinc, then it is possible to daö twin structure C'fcu ßtstabilisioren. Cu den as a zucätse Alloys oi & ä above all Kotallo, such as copper, titanium, Aluminum, iron, ilacnosiua as well as chroc * and kinkel alone odor in combination cooißmrt · Against this, the knownon work Impurities before high-purity zinc lociorunson, wio cie voin-0tehcnd does not mention virräen, namely tin, caor «i * ua xaid lead all suitable stabilizers for daa twins ^

0 5/1123 6AD OBiGiNAL

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A feature of the invention is to use alloy additives in Proportions »which correspond to the order of magnitude of impurities, eo that the original natorial used is also a Peinzink can be" *

Example I. ₁

For purposes of comparison, a fine zinc was initially used in usually worked

Feinsink bit with a purity grade of 99.995 and with the addition / - "OftOot £ Fb ₉ o, oo1 i> Cd ₉ <o _v oo1 i> Sn and o _f ooo8 Jt was potted in the normal way on a billet with a thickness of 120 m , at the normal rolling temperatures of 200 °, starting »hot rolled down bio to 0.3 ma thickness, whereby the degrees of rolling up to 3 na from stitch to stitch were within the limits of 7 - 25 £. The stitches from 3 square meters were the following *

3 »oo - 2.3o - 1 _f 7o - 1.25 - o, 85 - 0.57 - o _f 42 - o _t 3o · The oefUge of a material produced showed a fully" conaene recirculation without the presence of twins "and the profundity of such a band was completely unsafe "

In order to eretelliuig a twin o ^ tfOgöe of the invention, the Valzplan was then abas ο, 57 aa folßonderaaaoon changed! The last wamisticho were durohgefOhrt from o.57 to p.45 to ο »32, then let the tape catch a cold and whale cold from o.32 to o.3o na , 5 - 7 years carried out · The structure that has now been achieved with numerous twins has proven to be exceptionally good to pull apart. However, this band Liose to several hours at moderate temperatures up to about · 30 * 4o °, then these twins · Han bokaa ^disappeared: again a real Rekristaaiisationsgefuge and very poor 2iefzlehfShigkeit · -.

' BATH

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So one did the? E inc inks certain xegioration elements in eo small Congon Eu ₉ that the deformability is not or only imperceptibly impaired, oo one can shift the envelope from a twin agof (Ige into a recriotallization structure at much higher temperatures and thus that, for the thermoforming gonachaft so suitable twin agofUge can be kept stable even at higher temperatures *

To this Zvook the above-mentioned Peinzink was alloyed with ο, σοί jC 'H ₉ o ₉ oo2 i * Fe ₉ o ₉ oo1 i * Cu and o ₉ oooo4 i » Kg and with a cold stitch between 4.5 and 7 ^, like described above, rolled to produce a twin structure · The material present at the end of the rolling process again had a pronounced twin structure · At a glow of 80 ° over 24 hours or 50 ° over 600 hours, however, this twin structure was absolutely stable «

Even after months of storage, the band was absolutely deep— drawable '

Boinpiql 2 . ..

A Cu-Ti-Iegienmg with 0.6 jC Cu and O ₉ 12 £ Ti was rolled down at an old 25o ° beginning down to ο ₁ 74 πα strength a with degrees of rolling of 2o - 3o i> between two successive passes Material annealed for 2 hours at 400 ° _9, after which an absolutely unambiguous eo3uLis4ew BekrlatallisierungsgestUge was obtained "Bin XoIl of this annealed clay material was then deformed after annealing in a Caitetich 4 and 7 ^ The material had to oindoutig 2willing structure, while the previously only ware 'down Annealed material did not have a twin structure, but rather a recrystallization structure. Both materials were subjected to the deep leaching process, whereby aioh proved that only the material with a twin structure was capable of deep learning, while the only annealed material with an Eekristian boiling structure withstood the stresses and strains.

809805 / 1.12-3.

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As a starting point, nit ci ^ ior Le
eetcunß copper - titanium ait etva t _f 5 5 * copper and o, 5 titanium worked according to the ancestors of Boiepiel 2 · vurdo dor ßlaicfco Zffökt vie boiri Baispiole 1 vmd 2 orroicht »DicBor effect verilndcrto eich also not, vean aan beispiolovoicc oinen alloying / ondots _t der from o, 5? * Kupfor and otva o _t 2 5ί titanium bcotiind ·

BAD OBiGINAU 809805/1123

Claims (2)

US8311 claims 1.) Process for the production of semi-finished zinc products, predominantly in sheet metal and strip form, with deep-drawing ability that remains constant over a long period of storage using conventional deformation processes, characterized in that a small amount of the order of magnitude of impurities of copper, titanium, aluminum, magnesium , manganese, zinc-containing iron, chromium and / or nickel initially hot transferred with stitches above 20% in a suitable semi-finished form and then cold-formed ver with a reduction of 4 to 7%. 2.) The method according to claim 1, characterized in that one uses a fine zinc with a content of alloy additives of about 0.004 to about 0.1 % . New sub days (Art. 7 Ι Τ para. 2 no. 1 set of 3 Änderangsges. V. 4. 9.1967) 809805/1123 "