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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 ferrous 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 trolls. 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

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