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MACHINING BY ELECTRICAL EROSION THE GEAR WHEELS

Drd. Ing. IOAN BADIU, Technical University of Cluj-Napoca Prof.univ.dr.ing. MARCEL S.POPA, Technical University of Cluj-Napoca

ABSTRACT: Gears which can form a gear tooth are transmitted through successive and continuous contact (gear) rotation and torque between two shafts. For low tooth loads and low peripheral speeds between 0.3 and 2 m / s are chosen based alloys and steels, gray cast iron. In measuring instrument industry kinematics great precision is needed. Wheel group required less include some hand-operated mechanisms, such as jacks, some trolls. These wheels are larger and they are made of alloy steel, semi-hard and sometimes gray cast iron FC250, FC300. KEY WORDS : cogwheels, electrical erosion, materials, gears. 1.INTRODUCTION Breaking teeth fatigue is the main form of damage to the gear steel hardness active flanks> 45 HRC and cast iron gear or materials plastics. Breaking bending occurs due to application of the tooth, while stress variations that cause fatigue of the material and the appearance at the base of the tooth of cracks that develop over time, resulting, ultimately, tooth breakage. Fatigue crack appears in the body connecting the tooth wheel on the stretched fibers, which is the maximum bending stress concentration

2.THE PROCESSING

TECHNOLOGY TOOTHED

WHEELS. The avoidance of fatigue fracture of the teeth can be achieved by limiting the bending stresses the base of the tooth to the

allowable value, by increasing the module, implementation of large connecting rays and positive displacement profile.

Fig.1. Breaking the teeth by tiredness

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.

Fig.2.Wire electrical discharge (wire EDM) machine- 350 x 250 x 200 mm | BSW-325

Fig.3. The form 2D gears with inclined teeth by erosion electrical processing.

Fig.4. The form 2D gears

Fig.5. The form 2D gears with inclined teeth by erosion electrical processing.

Fig.6. Gear wheels assembled.

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Fig.7. Gear wheels assembled.

Fig.8. The form gear units.

3.EXPERIMENTAL RESULTS FROM THE POCESSING OF ELECTRICAL EROSION.

Cogwheels may be machined by wire electrical erosion. The advantage is that it is very good precision processing.

Fig.9.Table containing the values electrical erosion parameters.

Fig.10.The reporting of parameters electric erosion.

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Fig.11.Table containing the values electrical

erosion parameters.

Fig. 12.The connection between electrical

erosion parameters.

Fig.13. Reporting electric erosion productivity

parameters.

Fig.14. Connection and reporting productivity

parameters electrical erosion.

Fig.15.Table containing the values electrical

erosion parameters.

Fig. 16.The connection between electrical

erosion parameters.

Fig.17. Connection and reporting productivity

parameters electrical erosion.

Fig.18.Form 3D graphics parameters electrical

erosion.

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Fig.19.Table containing the values electrical

erosion parameters.

Fig.20.Form 3D graphics parameters electrical

erosion.

Fig.21.Table containing the values electrical

erosion parameters

Fig.22.Form 3D graphics parameters electrical

erosion.

Fig.23.Form 3D graphics parameters electrical

erosion.

Fig.24.Table containing the values electrical

erosion parameters.

Fig.25.Form 3D graphics parameters electrical

erosion.

Fig.26.Form 3D graphics parameters electrical

erosion.

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Fig.27.Form 2D graphics parameters electrical.

Fig.28.Form 2D graphics and equations of

lines electrical erosion parameters.

Fig.29.Graphical form of electrical erosion

parameters.

Fig.30.Graphical form of electrical erosion

parameters.

Fig.31.Graphical form of electrical erosion

parameters.

Fig.32.Form 2D graphics paarmetrilor

electrical erosion.

Fig.33.Form 2D and electrical erosion

parametric equations.

Fig.34.Form 2D and electrical erosion

parametric equations.

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Fig.35.Form 2D and electrical erosion

parametric equations.

Fig.36.Form 2D and electrical erosion

parametric equations.

Fig.37.Form 2D and electrical erosion

parametric equations.

Fig.38.Form 2D and electrical erosion

parametric equations.

Fig.39.Form 2D electrical erosion parameters

and values.

Fig.40.Table containing the values electrical

erosion parameters

Fig.41.Form 3D graphics parameters electrical

erosion.

Fig.42.3D graphic form paarmetrilor electrical

erosion and values.

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Fig.43.Table containing the values electrical

erosion parameters

Fig.44.Form 2D electrical erosion parameters.

Fig.45.Form 2D electrice.si erosion parameters values.

4.CONCLUSIONS Gears are widely used in mechanical transmissions due to the advantages it presents: constant transmission ratio; operational safety; durability; high efficiency; small size; can be used for a wide range of powers, speeds and gear ratios. As disadvantages can be mentioned: high precision manufacturing and assembly; complicated technology; noise and vibration operation. REFERENCES. [1]Ailincai, G.: Studiul metalelor ,Institutul Politehnic Iasi, 1978. [2]Balc, N.: Tehnologii neconventionale, Editura Dacia Publishing House, Cluj-Npoca, 2001. [3]Bolundut, L.I.: Materiale si tehnologii neconventionale, Editura Tehnica-Info, Chisinau, 2012.

[4]Buzdugan, Gh., ş.a. – Vibraţii mecanice, Editura Didactică şi Pedagogică, Bucureşti, 1λ7λ. [5]Constantinescu, V., ş.a. – Lagăre cu alunecare, Editura Tehnică, Bucureşti 1980. [6]Colan, H.: Studiul metalelor, Editura Didactica si Pedagogica , Bucuresti, 1983. [7]Domsa, A.: Materiale metalice in constructia de masini si instalatii, Editura Dacia, 1981. [8]Dašić, P.: 100.000 Technical and ICT Abbreviations and Acronyms. Vrnjačka Banja: SaTCIP Ltd., 2013. – pp. 1200. ISBN 978-86-6075-001-5. [9]Dašić, P.μ Analysis of the journal impact factor in field of mechanical engineering. Plenary and Invitation paper. In: Proceedings of the 11th International

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Volume 1, Sokobanja, Serbia, 15-18. September 2011. Edited by Predrag Dašić. Vrnjačka Banjaμ SaTCIP Ltd., 2011, pp. 62-70. ISBN 978-86-6075-027-5. [10] Dašić, P.; Natsis, A. and Petropoulos, G.: Models of reliability for cutting tools: Examples in manufacturing and agricultural engineering. Strojniški vestnik – Journal of Mechanical Engineering, Vol. 54, No. 2 (2008), pp. 122-130. ISSN 0039–2480. [11] Dašić, P.; Franek, F.; Assenova, E. and Radovanović, M.μ International standardization and organization in the field of tribology. Industrial Lubrication and Tribology (ILT) Journal, Vol. 55, No. 6 (2003), pp. 287-291. ISSN 0036-8792. Available on Web site: http://www.emeraldinsight.com/Insight/ ViewContentServlet?Filename=Published/EmeraldFullTextArticle/Articles/0180550605.html. [12] Gafiţanu, M. ş.a. – Organe de maşini, vol. 2. Editura Tehnică, Bucureşti, 2002. [13]Nichici, A.: Prelucrarea prin eroziune electrica in constructia de masini, Editura Facla, Timisoara, 1983. [14]Olaru, D.N. – Tribologie. Elemente de bază asupra frecării, uzării şi ungerii, Litografia Institutului Politehnic „Gheorghe Asachi”, Iaşi, 1λλ5. [15] Popa,M.S.:Masini, tehnologii neconventionale si de mecanica fina-Editie Bilingva, Romana-Germana, Editura U.T.PRESS, Cluj-Napoca, 2003. [16]Popa, M.S.: Tehnologii si masini neconventionale, pentru mecanica fina si microtehnica, Editura U.T.PRESS, Cluj-Napoca, 2005. [17]Popa, M.S.:Tehnologii inovative si procese de productie, Editura U.T.PRESS, Cluj-Napoca,2009.

[18]Popescu, Luminiţa Georgeta Cristinel Popescu, Influenţa dispozitivelor de anclanşare automată a rezervei asupra funcţionării întrerupătoarelor de cuplă longitudinală, Analele Universităţii “Constantin Brâncuşi” din Târgu Jiu, seria Inginerie, nr.2/2010, pp 35-44, ISSN 1842-4856, Revistă categoria B+, [19]Popescu, Luminiţa Georgeta -Aplicaţii ale liniarizării exacte prin reacţii la acţionările de curent continuu, Analele Universităţii “Constantin Brâncuşi” din Târgu Jiu, seria Inginerie, nr.1/200λ, pp 7-14, ISSN 1842-4856, Revistă categoria B+, [20]Rădulescu, Gh., Ilea, M. – Fizico-chimia şi tehnologia uleiurilor lubrifiante, Editura Tehnică, Bucureşti, 1λ82, [21]Sofroni, L.: Fonta cu grafit nodular,Editura Tehnica, Bucuresti, 1978. [22]Trusculescu, M.: Studiul metalelor, Editura Didactica si Pedagogica ,Bucuresti ,,1978. [23]Stancioiu,Alin.,-RESEARCH ON THE INFLUENCE OF HEAT TREATMENT ON THE OF THE STEEL CUTTING TOOLS (PART I) .Annal s of t he „Cons t antin Brâncuși ” Uni ve r s i t y of Târ g u -Jiu,Engineering Series, Issue 4/2013. [24]Stancioiu,Alin.,- RESEARCH ON THE INFLUENCE OF HEAT TREATMENT ON THE OF THE STEEL CUTTING TOOLS (PART II). Annal s of t he „Constantin Brâncuși ” Uni ve r s i t y of Târgu -Jiu,Engineering Series, Issue 4/2013. [25]Stancioiu,Alin.,-Concerning economicity of the techological process for manufacturing a piece. Methods to reduce costs.Fiabilitate si Durabilitate - Fiability & Durability Supplement No 1/ 2014 Editura “Academica Brâncuşi” ,2014, Târgu Jiu, ISSN 1844 – 640X 320 .