Annalsăofătheă„ConstantinăBrancusi”ăUniversityăofăTargu

Annalsăofătheă„ConstantinăBrancusi”ăUniversityăofăTargu Jiu, Engineering Series, No. 2/2015

PROCESSING ELECTRICAL EROSION TO ROTATE WITEH TEETH TILTED

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 たm.

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.

Fig. 3. Driven-wheel driving wheel assembly.

Fig. 4. Types of fissures.

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

Fig. 6. The 3D graphic of gears.

Fig. 7. Toothed wheels assembly.

Fig. 8. The 3D graphic of gears.

Fig. 9. Toothed wheels.

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

Fig. 11. Gear wheels.

Fig. 12. Toothed wheel gear-pinion.

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

Fig. 14. Toothed wheel inclined teeth.

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.

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.

Fig. 23. The connection between electrical erosion parameters.

Fig. 24.The connection between The electrical

erosion parameters.

Fig. 25.The form 3D graphics parameters The

electrical erosion.

Fig. 29.The 3D graphic of The electrical

erosion parameters and their values.

Fig. 31. The form 3D graphics parameters The

electrical erosion.

Fig. 33. The form 2D graphics The electrical

erosion parameters.

Fig. 34. The form 2D graphics The electrical

Fig.35. Table containing the values parameters

Fig. 36. The form 3D graphics parameters The

electrical erosion.

Fig. 37. The 3D graphic of The electrical

Fig. 39. The form 2D graphics roughness

values and percentages.

Fig. 41.. The form 2D graphics roughness

Fig. 42. The form 2D graphics roughness and

values.

Fig. 43. The connection between The electrical

Fig. 46. The form 2D graphics roughness and

values.

Fig. 50.The form 2D graphics roughness

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.

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