BALA

Placute

2005-04-13T14:34:00.000-07:00

Nevoia de prelucrare a metalelor prin procedee de aschiere cat mai rapide si performante, si in aceeasi masura ieftine din puct de vedere economic a impus crearea de scule din materiale dure si extradure cu caracteristici mecanice foarte bune astfel au fost create placutele amovibile, aceste placute pot fi realizate din carburi metalice, materiale mineralo - ceramice materiale metalo - ceramice, din nitrura cubica de bor etc.

Materiale mineralo-ceramiceParalel cu dezvoltarea aliajelor dure din carburi metalice si compusi metalici, s-a dezvoltat si ramura materialelor dure mineralo-ceramice care sunt mult mai ieftine decat carburile metalice, fapt pentru care prezinta un interes deosebit, in special pentru constructia de scule aschietoare, cum sunt: cutitele, frezele, discurile abrazive etc., cat si pentru constructia anumitor Piese nepcesare industriei. Problema prezinta interes si prin faptul ca aceste materiale dure, nemetalice: diamant, n.c.b., corindonul, carborundul, cuartul, oxidul de Al aglomerat, carbura de bor aglomerata etc. pot inlocui in constructia de scule, cat si in alte domenii, materialele dure metalice sau, in alte cazuri, pot fi combinate cu ele.Mod de obtinereDin oxidul de Al si alte tipuri de oxizi, se obtin placute mineralo-ceramice si scule care permit sa se aschieze materialele cu viteze de 500-1200 m/min. si chiar mai mari. Aceste placute se obtin din pulbere de oxid de Al cu o granulatie foarte fina functie de marca placutei care a evoluat in timp, fapt ce a adus la imbunatatirea proprietatilor fizico-mecanice ale placutelor ceramice. Aceasta pulbere de oxid de Al se amesteca foarte bine si omogen cu un liant ca: ulei oleic, celuloza, metale, etc. Acest amestec este presat in matrite de diferite forme, la rece sau la cald, in functie de aglomeratul de oxid de Al, la un timp optim de 2-10 minute, in functie de marimea piesei. De mentionat ca timpul de sinterizare are o mare influenta asupra caracteristicilor pieselor. Dpa sinterizare produsele obtinute sunt rectificate, rodate sau lepuite si apoi sortate. Dar cele mai bune rezultate au inceput sa fie obtinute in constructia de scule aschietoare cu materiale mineralo-ceramice obtinute din amestecarea oxidului de Al, cu oxidul de zirconiu, cu carbura de titan sau alte compozitii chimice.Sunt si alte tipuri de placute metalo-ceramice care sunt de fapt placute din carburi metalice acoperite cu un strat de 0,4-0,5 mm de oxid de Al. Acoperire se face in vid cu flux de electroni si confera acestora o crestere a rezistentei la uzura.

Taieri ale materialelor

2005-04-12T19:16:00.000-07:00

Utilizand electro tehinca razei de plasma este usor de realizat orice forma sau tipodimensiune atat in materialele feroase cat si in cele neferoase.
Taierea cu ajutorul laserului se face prin topirea materialului in zona de contact a acesteia cu particula de laser. Masinile de taiat cu ajutorul laserului pot prelucra cu mare acuratete contururi exterioare foarte complexe,efunda/ .
Taierea cu ajutorul apei, laserului si plasemei alp/, completari pentru prelucrarile cu laserul aici laser/

Material cu care se imbunatateste...

2005-04-12T18:21:00.000-07:00

Mateial cu ajutorul carora se maresc calitatile suprafetelor taietoare la scule fie prin tratare, fie prin acoperire cu materialul respectiv
Steam Tempering
Steam tempering gives a strongly adhering blue oxide surface which acts to retain cutting fluid and prevent chip to tool welding, thereby counteracting the formation of built up edge. Steam tempering can be applied to any bright tool but is most effective on drills and taps
Titanium Aluminium Nitride Coating (TiAlN)/Aluminium Titanium Nitride
Coating (AlTiN)
Titanium Aluminium Nitride is a multi layer ceramic coating applied by PVD coating technology, which exhibits high toughness and oxidation stability. These properties make it ideal for higher speeds and feeds, whilst at the same time improving tool life. TiAlN is suitable for drilling and tapping. It is recommended to use TiAlN when machining dry.
Bronze Finish
The bronze finish is a thin oxide layer formed on the tool surface and it is applied principally to Cobalt high speed steels.
TiAlN - X
TiAlN – X is a Titanium Aluminium Nitride coating, which incorporates the latest developments in surface coating technology. The high aluminium content of the coating combined with nanometer layering techniques ensures a unique blend of high temperature resistance, hardness and toughness. This coating is ideal for milling cutters which are intended to run without coolant and when milling materials with high hardness.
Nitriding
Nitriding is a process which is used to increase the hardness and wear resistance of the surface of a tool. It is particularly suitable for taps that are used on abrasive materials such as castings, bakelite, etc. Nitriding is used on twist drills when it is desirable to increase the strength and wear resistance of the cylindrical lands.
Chromium Nitride Coating (CrN)
CrN is an excellent coating for aluminium alloys and low alloyed steel materials. CrN can also be used as an alternative on Titanium and Nickel alloys. This coating has a low tendency for built up edges. Hardness 1750HV.

Hard Chromium Plating
Hard chromium plating under specific conditions increases the surface hardness significantly, achieving values of up to 68Rc. It is especially suitable when tapping structural grade steels, carbon steels, Copper, Brass, etc.
Super-R Coating
SUPER-R is a coating specific to the milling operation. It exhibits low internal stress, high toughness and wear resistance, whilst demonstrating excellent oxidation resistance, thanks to the high oxidation temperature of the coating.
Zirconium Nitride Coating (ZrN)
Zirconium Nitride is a ceramic coating applied by PVD coating technology. It exhibits a combination of properties which make it attractive when tapping Aluminium and Aluminium alloys.In addition to the treatments described, a number of commercial surface treatments can be applied in accordance with specific customer requirements such as HI TEN carbide impregnation and Molybdenum Disulphide. Consult your local Dormer technical representative for advice on treatments to suit your particular application.
Titanium Nitride Coating (TiN)
Titanium Nitride is a gold coloured ceramic coating applied by physical vapour deposition (PVD). High hardness combined with low friction properties ensure considerably longer tool life, or alternatively, better cutting performance from tools which have been coated. TiN coating is used mainly for drills and taps
Titanium Carbo Nitride Coating (TiCN)
Titanium Carbo Nitride is a ceramic coating applied by PVD coating technology. TiCN is harder than TiN and has a lower coefficient of friction. Its hardness and toughness in combination with good wear resistance ensure that it finds its principal application in the field of milling to enhance the performance of milling cutters.
Dialub (Diamond Like Coating)
Dialub is an amorphous diamond coating with extremely low coefficient of friction and high hardness. This coating is specially developed for tapping in aluminium alloys with low Si-content