AnnalsăofătheăConstantinăBrancusiăUni versity of Targu Jiu, Engineering Series , No. 22015 [607407]

Annalsăofătheă„ConstantinăBrancusi”ăUni versity of Targu Jiu, Engineering Series , No. 2/2015

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GEAR WHEELS THE PROCESSED BY ELECTRICAL EROSION

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

ABSTRACT: 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 industry are preferable fer rous alloys: bronze, brass and
aluminum alloys, and where speeds and demands are low gears are made of sheet steel or alloys.
Wheel group required less include some hand-operated mechanisms, such as jacks, some t rolls.
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, processing electrical erosion.

1.INTRODUCTION
For gears subject to high variable operating at
low speed and medium (2-8m/s) are
recommended semi-hard steels and low alloy
likely to be improved. These wheels are used
in various fields. For example, some large
gear drive found in mills and cement kilns,
some lifting and transport machinery,
agricultural machinery, combine mining. The
blanks are obtained by casting, cast iron or
steel, some elements are obtained from the
laminates.For heavy gear required to run high
peripheral speeds (12-16m / s) with high loads and shocks tooth in operation, high toughness
steels are used, which applies superficial
hardening by heat treatment and
thermochemical. Steels are suitable for
manufacturing these gears are alloy or alloy,
and in some cases can be used and tempered
steels. In cases where demand is particularly
high, it is advisable to use high alloyed steels,
case hardening steels such as Cr – Ni, Cr – Ni –
Mo, Cr – Ni – Ni steels W. use is
recommended as we confer high resistance of
these wheels.
2.EXPERIMENTAL RESULTS FROM THE POCESSING OF
ELECTRICAL EROSION.

FIG.1. WIRE ELECTRICAL DISCHARGE (WIRE EDM) MACHINE – 725 × 560 × 215 MM | G22F.

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Fig.2. The 3D graphic of the toothed wheel.

Fig.3. The values of toothed wheel.

Fig.4.The form 2D gears processed by
electrical erosion.

Fig.5. The form 2D gears processed by
electrical erosion.

Fig.6. The form 2D gears processed by
electrical erosion.

Fig.7. The form 2D gears processed by
electrical erosion.

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Fig.8. The form 2D gears processed by
electrical erosion.

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

Fig.10. Graphic form of electrical erosion
parameters.

Fig.11. The parameters of electrical erosion.

Fig.12. The connection between electrical
erosion parameters.

Fig.13. Surface roughness parameter values.

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Fig.14. Graphic form of electrical erosion
parameters.

Fig.15. The reporting of electrical erosion
Surface roughness parameters.

Fig.16. Table containing the values electrical
erosion parameters.

Fig.17. The connection between electrical
erosion parameters.

Fig.18. The reporting of electrical erosion
Surface roughness parameters.

Fig.19. 3D The form parameters of electrical
erosion.

Fig.20. 3D The form parameters of electrical
erosion.

Fig.21. 3D The form parameters of electrical
erosion.

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Fig.22. The electrical erosion parameter values
in the form of balls.

Fig.23. The straight lines and electrical erosion
graphical form parameters.

Fig.24. Form 2D electrical erosion parameters
and parametric equations.

Fig.25. 2D electrical erosion parameters.

Fig.1. 3D the form parameters of electrical
erosion.

Fig.26. 3D the form parameters of electrical
erosion.

Fig.27. Points that determine erosion
parameters electrical lines.

Fig.28. The straight lines electrical parameters
and equations erosion graphs.

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Fig.29. The straight lines electrical parameters
and equations erosion graphs.

Fig.30. The straight lines electrical parameters
and equations erosion graphs.

Fig.31. The straight lines electrical parameters
and equations erosion graphs.

Fig.32. The straight lines electrical parameters
and equations erosion graphs.

Fig.33. 3D the form parameter intensity.

Fig.34. 3D the form parameter intensity.

Fig.35. 3D the form parameter intensity.

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3.CONCLUSIONS
A range of thermal and thermo-chemical
treatments are applied in order to increase the
workability (annealing, tempering), increased
durability and reliability in operation
(carburizing, hardening, tempering) or for the
purpose of hardening surfaces as special
treatment (cianizarea, surfizarea, feroxarea,
phosphating, iono-nitrurarea). So to influence
and improve the machinability of steels and
cast irons for making gears is necessary to act
by heat treatments on materials to improve
machining conditions. If obtained from semi
forged gears recommended forging
temperature to be 1000-1250oC, to avoid
fissures and cracks-them.If some small gears and pinions are processed cold (cold extrusion
or stamping) have applied annealing. Nitriding
steels are used for gears subjected to heavy
wear, so heavily loaded. Alloying elements
form nitrides hard and stable. Can be nitrided
steels and 39MoCA06 38MoCA09 required to
wear wheel (gears, sprockets, chain wheels,
snails, racks). These steels are subjected to
heat treatments for improvement: double
quenching and tempering. The hardness of the
nitrided layer depth decreases. Nitriding is
done at a temperature of about 500-600o C
depending on steel composition, thickness
reaching 0,8 mm in a time of about 40-60
hours in two successive stages
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., ș.a. – Vibrații
mecanice, Editura Didactică și
Pedagogică, București, 1λ7λ.
[5] Constantinescu, V., ș.a. – Lagăre cu
alunecare, Editura Tehnică, București
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.μ 100.000 Technical and
ICT Abbreviations and Acronyms.
Vrnjačka Banjaμ 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
in Mechanical Industry –
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/01805506
05.html.
[12] Gafițanu, M. ș.a. – Organe de
mașini, vol. 2. Editura Tehnică,
București, 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 și ungerii,
Litografia Institutului Politehnic
„Gheorghe Asachi”, Iași, 1λλ5.
[15] Popa,M.S.:Masini, tehnologii
neconventionale si de mecanica fina-Editie

Annalsăofătheă„ConstantinăBrancusi”ăUni versity of Targu Jiu, Engineering Series , No. 2/2015

34
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, Luminița Georgeta
Cristinel Popescu, Influența dispozitivelor
de anclanșare automată a rezervei asupra
funcționării întrerupătoarelor de cuplă
longitudinală, Analele Universității
“Constantin Brâncuși” din Târgu Jiu, seria
Inginerie, nr.2/2010, pp 35-44, ISSN 1842-
4856, Revi stă categoria B+,
[19] Popescu, Luminița Georgeta –
Aplicații ale liniarizării exacte prin reacții
la acționările de curent continuu, Analele
Universității “Constantin Brâncuși” din
Târgu Jiu, seria Inginerie, nr.1/200λ, pp 7 –
14, ISSN 1842- 4856, Revistă ca tegoria B+,
[20] Rădulescu, Gh., Ilea, M. – Fizico-
chimia și tehnologia uleiurilor lubrifiante,
Editura Tehnică, București, 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 Brâncuș i ” 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 Brâncuși” ,2014, Târgu Jiu,
ISSN 1844 – 640X 320 .