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chumaman
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PostSubject: Re: Pracke   Sun Apr 20, 2014 1:17 pm

da ne tupim preveć evo npr. preporuke vrsnog majstora talijana receptura za 440C,kad je već spomenut

440C
Heat treat at 1060°C, 15min soaking time. At this temperature you'll maximize either edge holding AND stain resistance
Quenching: NU Foil wrapping as depicted above and warm oil quenching (better) or plate quenching (copper plates transfer heat far better than aluminium plates) or forced air quenching (last resort). It is quite important to reach room temperature in no more than two minutes. The price you'll pay otherwise will be GREAT grain growth (which eventually will lead to less toughness, bigger carbide size and other problems) and too much retained austenite (which is bad).
Cryo treatment: talking about retained austenite, generally speaking, in SS you can solve this problem either by 1)increasing the tempering temperatures in the 500°C range and doing 3 temper cycles (you'll loose either HRC point and stain resistance with 440C) OR 2)When steel has just been quenched and it is at room temperature, refrigerate at -73°C for 1hr, then allow the steel to air warm and reach room temperature. Once again: this will ensure that the retained austenite will be minimized and I strongly recommend you to do this if you should use Air Quenching.
Temper (no NU foil here): two x 2hrs at 165-175°C (obviously air cooling to room temperature in between).
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ninikki



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PostSubject: Re: Pracke   Sun Apr 20, 2014 1:21 pm

Prevescu, hvala Smile
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chumaman
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PostSubject: Re: Pracke   Sun Apr 20, 2014 1:34 pm

Da naglasim, nisam dovoljno stručan zato koristim veliko znanje našeg kolege Stridera ja sam tu samo
korisnik te logistika ....kako je iznad svega kaljenje vrlo važan proces izrade noža tu ne prepuštam ništa experimentiranju
nego koristim usluge profesionalaca .
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djuragekon



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PostSubject: Re: Pracke   Sun Apr 20, 2014 3:33 pm

ninikki wrote:
Gvozden wrote:
Vule u Nisu imas Metalcentar.Iz Nivog sela kad predjes most,ulazis u Mramor imas firmu koja prodaje celik sa kontrolicanim sastavom.Odma posle mosta,cak mislim da je prvi objekat.
Bila je jos jedna firma sa celicima iz Rusije ali je zatvorena.
Znam Gvozdene, bio sam ali nemaju neki izbor. Imaju prohrom doduse ali nisam pitao koji. Trazio sam celik 15N20 za damaskus ali nemaju. Za prohrom cu videti koji je i da li moze da se kali. Imaju celike C4580, C4582, C4573, C4574, C45707... hm imaju i paste za poliranje... Znaci nisam dobro gledao...

Kod nas se dosta razbacuju sa tim nazivima. Recimo u firmi u Cacku nude c4173 i vode ga kao AISI 420. Mislim da je majstor Rale pomenuo, da kada je pregledao specifikacije, taj njihov 4173 ustvari vise odgovara AISI 440 a ne 420.
Ali dobar je to celik za nozeve. Meni su ga kalili na nekih 56-58HRC ako se ne varam..

Edit: Post ispravljen..


Last edited by djuragekon on Sun Apr 20, 2014 5:04 pm; edited 1 time in total
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chumaman
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PostSubject: Re: Pracke   Sun Apr 20, 2014 4:34 pm

Ups, sad sam zbunjen isti taj Č. 4573 bi trebao biti X5CrNiMo17/12/2 ili AISI 316 (SUS316, 1.4401, 1.4436, S31600)
evo i cijele tabele....otprilike svugdje je ista
http://www.serto-bel.hr/inox-opcenito/usporedna-tablica-nehrdjajucih-celika-inoxa.html
http://www.slogametal.com/ProdajniProgram/CeliciUKvalitetu_en.html
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djuragekon



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PostSubject: Re: Pracke   Sun Apr 20, 2014 5:03 pm

Jao moja greska. Ispravicu post da se ne bi neko za*ebo..

U pravu si Chumamane. Ja sam nabavljao 4173 za nozeve, i to je taj sto ga vode pod AISI 420f.

4573 je austenitni 316 i to sam samo jednom kupio neke sipke. I sad sam potrazio profakturu i nisam primetio da je to profaktura za sipke a ne za lim..
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tvisters



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PostSubject: Re: Pracke   Wed May 07, 2014 3:32 pm

Zarazili ste me sa prackama pa resio i ja da probam da napravim koju  Very Happy 




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chumaman
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PostSubject: Re: Pracke   Wed May 07, 2014 11:19 pm

Very Happy pa nije baš da si 'probao' izgledaju odlično  cheers 
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ninikki



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PostSubject: Re: Pracke   Wed May 07, 2014 11:51 pm

PERFEKTNE Smile
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tvisters



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PostSubject: Re: Pracke   Thu May 08, 2014 1:12 am

hvala drugari

Sledecu cu da probam moorhammer. Sa slika deluje extra udobno u ruci ali ima puno brusenja oko nje (bice puna radionica prasine) pa treba da se nakanim da pocenm...
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tvisters



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PostSubject: Re: Pracke   Sun May 11, 2014 3:11 pm

Evo malo sam promenio model da vidim kako druge rade Smile
Upotrebio sa orah, beli i plavi vulkanfiber african blackwood i bubingu




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ninikki



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PostSubject: Re: Pracke   Mon May 12, 2014 7:49 am

Odlicna. Lepa kombinacija.
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tvisters



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PostSubject: Re: Pracke   Sun May 25, 2014 5:35 pm

hvala vule

evo jos jedna od mene kad ste se svi ulenjili
40kuglica 8mm stane u rucku
g10 jade green okolo  a unutrasnji sloj crna mikarta
ostaje da osmslim mozda neku zajednicku futrolu...
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PostSubject: Re: Pracke   Mon May 26, 2014 1:59 pm

tvisters wrote:
hvala vule

evo jos jedna od mene kad ste se svi ulenjili
40kuglica 8mm stane u rucku
g10 jade green okolo  a unutrasnji sloj crna mikarta
ostaje da osmslim mozda neku zajednicku futrolu...
Ala ih radiš -svaka čast..ti si ko japanac..Njima je dovoljno samo  da se pomene nešto- odmah naprave vrhunski proizvod...Našao sam dobar samostrel  ( što smo pričali )za mali iznos novca...Uz njega bi nož stajao kao privezak Very Happy...Ukida se dozvola od juna meseca na tetivna oružija..Dovoljno je da odeš sa ličnom kartom i ništa više...Nebi me iznenadilo ako i njih počneš da praviš Smile  ( šalim se malo )....
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chumaman
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PostSubject: Re: Pracke   Thu Aug 28, 2014 12:51 am

Projekt Moorhammer u tijeku....izradih dvodjelni model za kalup sad čekam prvu izlivenu seriju u aluminiju Very Happy
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ninikki



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PostSubject: Re: Pracke   Thu Aug 28, 2014 3:18 am

Dobar model. BIce to jaka i lepa pracka. Dobra simetrija , jako vazna jer se guma mora ravnomerno razvlaciti.. HM jedva cekam krajnji rezultat Smile Imajuci u vidu tvoje finiserske sposobnosti, bice to predivan model Smile
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chumaman
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PostSubject: Re: Pracke   Wed Oct 08, 2014 9:15 am

Krajnji rezultat Smile

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ninikki



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PostSubject: Re: Pracke   Wed Oct 08, 2014 9:53 am

Krajnji rezultat je odlicna pracka precizno uradjena. Tbg mi je mislim siroka, jer je to jaka guma i pri razvlacenju je neophodno brzo ispaljivanje jer kod duzeg nisanjenja igra tj drhti ruka posledica je promasaj. Ja bih smanjio sirinu u tapered obliku. 3cm kod kraka, 2 ili 2,5 cm kod koze. Sama pracka je odlicna. Bravo. Odlicna, odlicna. Very Happy
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PostSubject: Re: Pracke   Today at 9:18 am

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