Fiabilitate si Durabilitate – Fiability Durability No 2 2013 [607410]

Fiabilitate si Durabilitate – Fiability & Durability No 2/ 2013
Editura “Academica Br âncuși ” , Târgu Jiu, ISSN 1844 – 640X

53 GEAR WHEEL BY BRONZE MACHINED
ELECTRICAL EROSION

IOAN BADIU1, MARCEL S.POPA2
1Techni cal University of C luj-Napoca,ROMANIA,e -mail:badiu. [anonimizat]
2Technical University of Cluj -Napoca,ROMANIA,e -mail:[anonimizat]

Abstract: Them with beryllium bronze alloys are characterized by high corrosion resistance, good plasticity
fresh quality, fatigue resistance, abrasion. Tin bronzes contain up to 29% Sn, being recognized for their skills
and fatigue wear, anti -friction properties . Melt at high temperatures and tend to absorb gases insolidification
interval showing a strong tenden cy to the formation of segregation. Mechanical and physical properties depend
on the content of tin, so register a maximum resistance to 15% Sn, the hardness increases continuously
andelongation decreases sharply to 5 -6% Sn.

Key words: copper, electrical erosion , CNC, properties .

1.INTRODUCTION.

Lead bronze bearings are used to manufacture that must withstand high speeds and
pressures , is more suitable phosphor bronze lead. This is done by including a 3,5 % lead in
phosphor bronze . Lead is use genuine and obtaining lead – tin bronzes . Tin bronzes with high
, up 20% lead bearings are used for high performance .Traditional red bronzes contain about
88 % copper , 8 -10 % 2 -4 % tin and zinc. Red bronze with nickel containing up to 5% nickel .
Originally use d in the manufacture of pipes rifles, red bronze is used in machine building
components , including bearings .Aluminum bronze is as soft and durable as steel has good
resistance to corrosion , including dilute acid action . It is used in the manufacture of
propellers , parts for hydraulic equipment of heavy and chemical technology equipment , such
as tanks and pumps acid resistant .Aluminum bronzes have up to 9.8% Al. Were mechanical
resistance, high resistance to corrosion, but antifriction qualities worse than
usual. Ordinarybronzes( Cu – Sn)up to 14 % Snaremonophasic .

2.PROCESSING ELECTRICAL EROSION AND BRONZE MATERIAL.

Fig.1. Erosionmachine AW 310 T. Fig.2. The bronze gear wheel.

Fiabilitate si Durabilitate – Fiability & Durability No 2/ 2013
Editura “Academica Br âncuși ” , Târgu Jiu, ISSN 1844 – 640X

54

Fig.3. The bronze gear wheel.
Fig.4. The bronze gear wheel

Multitasking control software in real time enables preparation of the next pr ogram while
processing machine CNCprogramming works . The flexible system operators can satisfy both
beginners and advanced users. As the term artificial inte lligence, the term fuzzy logic is hard to
define. Application to the EDM is very exciting, and means that the control unit does not follow strict
rules to reach decisions or conclusions but consider options depending on desired results. This
approach is recommended in situa tions where a pro blem has more than one answer. Fairness is based
on user priorities, wh ich may vary from case to case.
Fuzzy logic is a promising development in the field of EDM as encouraging strategic planning
while improving automatic operation. For example, processing conditions to achieve high accuracy
and finish quality are similar to those required to obtain prompt processing. Choosing different results
is a strategic decision that involves different processing parameters and settings, and choosi ng the
correct parameters is a complex process. Electroerosion is by nature a process variable and the
management of these variables is the key to effective treatment.At this point, the us er can analyze
options and may reconsider may choose an alternativ e from the list of recommendations. For
example, if a finish and extremely high accuracy are indicated as priorities, processing time will be
very long.
The user can decide if it is too long and can look again to see what alternatives you finish and
preci sion are available at higher speeds. Final selection settings are determined aut omatically.

Fig.5. The structure of thealloywithphosphorus
Cu 95 Sn 5 P 0,15 Fig.6. The structure of thealloywithphosphorus
Cu 95 Sn5 P 0,15

Fiabilitate si Durabilitate – Fiability & Durability No 2/ 2013
Editura “Academica Br âncuși ” , Târgu Jiu, ISSN 1844 – 640X

55

Fig.7. The structure of thealloywithphosphorus
Cu 95 Sn 5 P 0,15
Fig.8. Recrystallized alloy structure Cu 90Zn10

Fig.9. Recrystallized alloy structure Cu 90 Zn10
Fig.10. Alloydendritestructure Cu 90, 10 Zn

Fig.11. Alloydendritestructure Cu 90 Zn10
Fig.12. Alloydendritestructure Cu 90Zn10.

Fiabilitate si Durabilitate – Fiability & Durability No 2/ 2013
Editura “Academica Br âncuși ” , Târgu Jiu, ISSN 1844 – 640X

56

Fig.13. Alloydendritestructure Cu 90 Zn10
Fig.14. Alloy structure Cu 88 Sn 8 Zn 4.

Fig.15. Alloy structureC u88 Sn 8 Zn 4.

Fig.16. Alloy structure Cu 88 Sn 8Zn 4.

Fig.17. Alloy structure Cu88Sn8 Zn 4

Fiabilitate si Durabilitate – Fiability & Durability No 2/ 2013
Editura “Academica Br âncuși ” , Târgu Jiu, ISSN 1844 – 640X

57 3.CONCLUSION.

Easy to use digital controls for all three axes allows for holes of 0,3 mm in diameter
with a ratio diameter / depth of 1:200. Modern EDM equipment performance are extremely
high: high processing speed, efficiency automation, interc onnection and memorizing very
longprocessing cycles. If solid electrode erosion, the desired shape is formed in the
workpiece with a three -dimensional electrode. The movements superimposed on the main
axes X, Y, Z, C, different shapes, indentations and ca vities are created in a way impossible
with other processing systems

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