13_Ioan Badiu - Universitatea "Constantin Brâncuşi" din Târgu-Jiu

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
mm²/min. Cutting is done in immersion.
Precision displacement measurement axes 0,5
m.
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
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Annalsăofătheă„ConstantinăBrancusi”ăUniversityăofăTargu Jiu, Engineering Series, No. 2/2015
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. 3. Driven-wheel driving wheel assembly.
Fig. 4. Types of fissures.
Fig. 2. The direction of the friction forces and
rolling circles.
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Annalsăofătheă„ConstantinăBrancusi”ăUniversityăofăTargu Jiu, Engineering Series, No. 2/2015
Fig. 8. The 3D graphic of gears.
Fig. 5.Wheel assembly inclined with teeth and
inclined pinion.
Fig. 6. The 3D graphic of gears.
Fig. 9. Toothed wheels.
Fig. 7. Toothed wheels assembly.
Fig. 10. The 3D graphic of toothed wheels.
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Annalsăofătheă„ConstantinăBrancusi”ăUniversityăofăTargu Jiu, Engineering Series, No. 2/2015
Fig. 11. Gear wheels.
Fig. 14. Toothed wheel inclined teeth.
Fig. 12. Toothed wheel gear-pinion.
Fig. 15. Gear toothed wheels.
Fig. 13. The 3D graphic of toothed wheels.
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Annalsăofătheă„ConstantinăBrancusi”ăUniversityăofăTargu Jiu, Engineering Series, No. 2/2015
3.EXPERIMENTAL
RESULTS
FROM THE POCESSING OF
ELECTRICAL EROSION
Fig. 19. The reporting the electrical erosion
productivity parameters.
Fig. 16. Table containing the values parameters
of electrical erosion.
Fig. 20. The connection between The electrical
erosion parameters.
Fig .17.The reporting of electric erosion
productivity parameters.
Fig. 21. Table containing the values parameters
of electrical erosion.
Fig. 18. The connection between electrical
erosion parameters.
Fig. 22. Table containing the values parameters
of electrical erosion.
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Annalsăofătheă„ConstantinăBrancusi”ăUniversityăofăTargu Jiu, Engineering Series, No. 2/2015
Fig. 23. The connection between electrical
erosion parameters.
Fig. 27. Table containing the values parameters
of electrical erosion.
Fig. 24.The connection between The electrical
erosion parameters.
Fig. 28.The form 3D graphics parameters The
electrical erosion.
Fig. 25.The form 3D graphics parameters The
electrical erosion.
Fig. 29.The 3D graphic of The electrical
erosion parameters and their values.
Fig. 26.The form 3D graphics parameters The
electrical erosion.
Fig. 30. Table containing the values parameters
of electrical erosion.
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Annalsăofătheă„ConstantinăBrancusi”ăUniversityăofăTargu Jiu, Engineering Series, No. 2/2015
Fig. 31. The form 3D graphics parameters The
electrical erosion.
Fig.35. Table containing the values parameters
of electrical erosion.
Fig. 32. Table containing the values parameters
of electrical erosion.
Fig. 36. The form 3D graphics parameters The
electrical erosion.
Fig. 33. The form 2D graphics The electrical
erosion parameters.
Fig. 37. The 3D graphic of The electrical
erosion parameters and their values.
Fig. 38. Table containing the values parameters
of electrical erosion.
Fig. 34. The form 2D graphics The electrical
erosion parameters and their values.
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Annalsăofătheă„ConstantinăBrancusi”ăUniversityăofăTargu Jiu, Engineering Series, No. 2/2015
Fig. 39. The form 2D graphics roughness
values and percentages.
Fig. 43. The connection between The electrical
erosion parameters and their values.
Fig. 40. The form 2D graphics roughness
values and percentages.
Fig. 44. The form 2D graphics roughness
values and percentages.
Fig. 45. The form 2D graphics roughness
values and percentages.
Fig. 41.. The form 2D graphics roughness
values and percentages.
Fig. 46. The form 2D graphics roughness and
values.
Fig. 42. The form 2D graphics roughness and
values.
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Annalsăofătheă„ConstantinăBrancusi”ăUniversityăofăTargu Jiu, Engineering Series, No. 2/2015
Fig. 47. The form 2D graphics roughness
values and percentages.
Fig. 49. The form 2D graphics roughness
values and percentages.
Fig. 48. The form 2D graphics roughness
values and percentages.
Fig. 50.The form 2D graphics roughness
values and percentages.
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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