processing electrical erosion to rotate witeh teeth … · dr.ing. marian g. pop , technical...

Fiabilitate si Durabilitate - Fiability & Durability No 2/ 2015 Editura “Academica Brâncuşi” , Târgu Jiu, ISSN 1844 – 640X

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PROCESSING ELECTRICAL EROSION TO ROTATE

WITEH TEETH TILTED

Dr.Ing. MARIAN G. POP ,

Technical University of Cluj-Napoca

Drd. Ing. IOAN BADIU, Technical University of Cluj-Napoca

Prof.univ.dr.ing. MARCEL S. POPA, Technical University of Cluj-Napoca

ABSTRACT: Static breakage of the teeth is caused by impact or large overload occurring during the

functioning gear due to operating conditions. Toothed wheels right rupture occurs at the base of the tooth and

the toothed wheels inclined falling progressively inclined gear teeth are break portions of the tooth. The

avoidance of static breakage of the teeth can be achieved by Bending gear calculation request to overload by

increasing the precision of execution and shaft stiffness.

KEY WORDS : Still breaking of the teeth, breakage, basic tooth, electrical erosion, materials

1.INTRODUCTION

Damage to teeth pitting active flanks (appearance of nicks on the flanks of the teeth assets) is

due to contact fatigue layer superficial active flanks, is the main form of damage to the gears with

hardness surface <45 HRC. Pinching is a fatigue phenomenon superficial active flanks teeth, the

contact stresses caused by time-varying. The first signs of fatigue occurs usually in the rolling

cylinders in the form of crazing. Initially, micro-cracks appear in the meaning of the forces of friction,

which are the driving wheel from rolling circle to the circle of the foot and the head, and the driven

wheel backwards, because the relative velocity between the two sides change their meaning pole

engagement. and the driven wheel backwards, because the relative velocity between the two sides

change their meaning pole engagement. The oil that adheres to the tooth surface is pressed - conjugate

tooth flank - the existing micro cracks.

In the crack appears hydrostatic pressure that favor the development of micro cracks and

detachment of small pieces of material, resulting in pinching surfaces of the teeth. Nicks develops over

time, leading to a malfunction of the unit. Avoiding decommissioning by pitting is done by: making an

account at the request of contact gear; heat treatment or thermochemical (surface tempering,

carburizing); positive displacement profile; sidewall roughness reduction teeth; the use of lubricants

additives.

2.THE PROCESSING TECHNOLOGY TOOTHED WHEELS

This car is equipped with CNC Fanuc and most powerful generator currently, Clean Cut

(Hence the name suffix CC machine), which can provide a maximum cutting speed of 400 mm²/min.

Cutting is done in immersion. Precision displacement measurement axes 0,5 μm.


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Fig. 1. Massive electrode electrical discharge machines Charmilles.

Exfoliation of the superficial layer of the tooth flanks is a form of material deterioration and fatigue

that comes from gear teeth were subjected to heat treatment and surface hardening thermochemical

(surface tempering, carburizing). Exfoliation is manifested by detachment portions of the surface layer

of tooth flank, as a result of fatigue cracks occurring at the border of the hardened layer and the core.

Preventing damage by peeling gear is made by adopting Suitable treatment technologies.

Fig. 2. The direction of the friction forces and rolling circles.


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Fig. 3. Driven-wheel driving wheel assembly.

Fig. 4. Types of fissures.

Fig. 5.Wheel assembly inclined with teeth and inclined pinion.


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Fig. 6. The 3D graphic of gears.

Fig. 7. Toothed wheels assembly.

Fig. 8. The 3D graphic of gears.


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Fig. 9. Toothed wheels.

Fig. 10. The 3D graphic of toothed wheels.

Fig. 11. Gear wheels.


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Fig. 12. Toothed wheel gear-pinion.

Fig. 13. The 3D graphic of toothed wheels.

Fig. 14. Toothed wheel inclined teeth.


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Fig. 15. Gear toothed wheels

3.EXPERIMENTAL RESULTS FROM THE POCESSING OF ELECTRICAL

EROSION

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

Fig .17.The reporting of electric erosion productivity parameters.


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Fig. 18. The connection between electrical erosion parameters.

Fig. 19. The reporting the electrical erosion productivity parameters.

Fig. 20. The connection between The electrical erosion parameters.


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Fig. 23. The connection between electrical erosion parameters.


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Fig. 24.The connection between The electrical erosion parameters.

Fig. 25.The form 3D graphics parameters The electrical erosion.



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Fig. 29.The 3D graphic of The electrical erosion parameters and their values.


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Fig. 31. The form 3D graphics parameters The electrical erosion.



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Fig. 33. The form 2D graphics The electrical erosion parameters.

Fig. 34. The form 2D graphics The electrical erosion parameters and their values.

Fig.35. Table containing the values parameters of electrical erosion.


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Fig. 36. The form 3D graphics parameters The electrical erosion.

Fig. 37. The 3D graphic of The electrical erosion parameters and their values.



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Fig. 39. The form 2D graphics roughness values and percentages.




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Fig. 42. The form 2D graphics roughness and values.

Fig. 43. The connection between The electrical erosion parameters and their values.



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Fig. 46. The form 2D graphics roughness and values.



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Fig. 50.The form 2D graphics roughness values and percentages.


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4.CONCLUSIONS.

Seizure is a form of wear of adhesion to gears and appears strong loaded, working at

peripheral speeds high. Due to large landslides of teeth, large concentrations of tasks, the Large

sidewall roughness oil may be expelled from the surfaces contact. Due to the direct contact of local

tasks large and high temperature in the contact area, micro-welds which occur over time, break and

recover continuously, due to the relative motion of the flanks. Produce welds on conjugated tooth

flank scratches and scuffing strip oriented towards slip. Preventing damage by jamming gear is

through improvement of lubrication and cooling through the use of lubricant additives by increasing

the precision of the execution and assembly by increasing the rigidity of trees by increasing surface

hardness by reduction roughness of tooth flanks.

5.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, 1979.

[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] Gafiţanu, M. ş.a. – Organe de maşini, vol. 2. Editura Tehnică, Bucureşti, 2002.

[9] Ghimisi,S. -An elastic-plastic adhesion model for fretting,15th.Symposium “DanubiaAdria”,

Bertinoro, Italia, 181-183.

[10] Nichici, A.: Prelucrarea prin eroziune electrica in constructia de masini, Editura Facla,

Timisoara, 1983.

[11] Olaru, D.N. – Tribologie. Elemente de bază asupra frecării, uzării şi ungerii, Litografia

Institutului Politehnic „Gheorghe Asachi”, Iaşi, 1995.

[12] Popa,M.S.:Masini, tehnologii neconventionale si de mecanica fina-Editie Bilingva, Romana-

Germana, Editura U.T.PRESS, Cluj-Napoca, 2003.

[13] Popa, M.S.: Tehnologii si masini neconventionale, pentru mecanica fina si microtehnica,

Editura U.T.PRESS, Cluj-Napoca, 2005.

[14] Popa, M.S.:Tehnologii inovative si procese de productie, Editura U.T.PRESS, Cluj-

Napoca,2009.

[15] Rădulescu, Gh., Ilea, M. – Fizico-chimia şi tehnologia uleiurilor lubrifiante, Editura Tehnică,

Bucureşti, 1982,

[16] Sofroni, L.: Fonta cu grafit nodular,Editura Tehnica, Bucuresti, 1978.

[17] Trusculescu, M.: Studiul metalelor, Editura Didactica si Pedagogica ,Bucuresti ,,1978.

processing electrical erosion to rotate witeh teeth … · dr.ing. marian g. pop , technical...

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