AnnalsăofătheăConstantinăBrancusiăUni versity of Targu Jiu, Engineering Series , No. 22015 [607414]

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

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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 toot h 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 r equired less
include some hand-operated mechanisms, such as jacks, some trolls. These wheels are la rger 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

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

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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 i t is very good precision
processing.

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

Fig.10.The reporting of parameters electric
erosion.

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

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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.

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