TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Researches Regarding the Machinability Characteristics of the Tungsten Carbide Layers Made Using the HVOF Process
(Cercetări privind caracteristicile de prelucrabilitate ale straturilor din carburi de wolfram realizate prin procedeul HVOF)
Vol LXII • No. 4A/2010
Vlad Ulmanu, Mihaela Călţaru, Marius Bădicioiu, Mihail Minescu
Universitatea Petrol-Gaze din Ploieşti, Bd. Bucureşti, nr. 39, Ploieşti
e-mail: vulmanu@upg-ploiesti.ro

 Keywords   tungsten carbide, HVOF, grinding.

 Abstract
This paper presents the technology and the parameters for grinding with abrasive diamond wheels of the working surfaces of the seat-gate assembly, from the structure of the industrial valves, hardened by means of tungsten carbide hardfacing using the High Velocity Oxygen Fuel (HVOF) process. The evaluation of the machinability characteristics of the tungsten carbide layer deposed by using the high velocity oxygen fuel process has been performed by means of establishing the roughness, thickness and hardness of the machined layer, and also by determining the eventual surface defects for two grinding alternatives using diamond wheels, performing either only one operation (finishing) or two operations (roughing and finishing).

 Rezumat
În acest articol se prezintă tehnologia şi parametrii de prelucrare prin rectificare cu discuri abrazive diamantate a suprafeţelor de lucru ale subansamblului scaun-sertar, din componenţa robineţilor industriali, durificate prin încărcare cu carburi de wolfram utilizând procedeul de pulverizare cu flacără cu viteză mare HVOF. Evaluarea caracteristicilor de prelucrabilitate ale stratului din carburi de wolfram depus prin pulverizare cu flacără cu viteză mare s-a efectuat prin determinarea rugozităţii, grosimii şi durităţii stratului prelucrat, precum şi prin determinarea eventualelor defecte de suprafaţă pentru două variante de rectificare cu disc abraziv diamantat, dintr-o singură operaţie (finisare) sau din două operaţii (degroşare şi finisare).



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