Science & Technology Development Journal – Engineering and Technology, 3(3):443-451
Open Access Full Text Article
Research Article
1
Faculty of Mechanical Engineering,
Industrial University of Ho Chi Minh
City, Ho Chi Minh City, Vietnam
2
Faculty of Transportation Engineering,
Ho Chi Minh City University of
Technology, Ho Chi Minh City, Vietnam
3
Vietnam National University, Ho Chi
Minh City, Vietnam
Correspondence
Duc Nam Nguyen, Faculty of Mechanical
Engineering, Industrial University of Ho
Chi Minh City, Ho Chi Minh City,
Vietnam
Email: nguyenducnam@iuh.edu.vn
History
• Received: 10-01-2020
• Accepted: 13-10-2020
• Published: 22-10-2020
DOI : 10.32508/stdjet.v3i3.658
Copyright
© VNU-HCM Press. This is an open-
access article distributed under the
terms of the Creative Commons
Attribution 4.0 International license.
Simulation study on polishing of gear surfaces in non-Newtonian
fuid
Duc Nam Nguyen
1,*
, Hung Anh Ly
2,3
, Cong-Truyen Duong
1
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ABSTRACT
The non-Newtonian fuid is one type of shear thickening fuid which applied to process the com-
plicated products. In this study, the new method of shear thickening fuid polishing (STFP) was
used to polish the alloy steel SCM435 gears and the principle and performance of polishing pro-
cess were also introduced. In the polishing process, the inclination angle of gears was believed
to be an important parameter that afects the pressure and sur face quality at diferent position on
the tooth surfaces because it determines the contact between the polishing fuid and the tooth
surface of the gear. The infuence of the inclination angles on the pressure distribution and char-
acteristics of fuid fow was per formed by simulation process. The inclination angles of 0, 4, 8, 12,
16, 20 and 24 degrees were chosen in this study. As a result, the best inclination angle of gears is
about 16 degree in the machining process. The tooth surfaces of gear have been in contact with
the polishing fuid and the produced pressure reaches of 14.88 kPa. In addition, the infuence of
polishing speed on pressure were carried out in this study when inclination angle was established
about 16 degree. The produced pressure on tooth surfaces increased with increasing the polishing
speed. The results indicated that the diferent polishing speed also greatly afects the sur face qual-
ity and machining efciency. Therefore, the suggested machining method can become a suitable
processing method for polishing the complicated products.
Key words: Non-Newtonian fuid, Gear sur face, Surface roughness, Inclination angle, Pressre,
Polishing speed
INTRODUCTION
e gears have been widely used in the elds of me-
chanics, industrial machinery, and engines. It is used
for converting the power and speed of the machines.
ey can transfer power from small to large, and low
to high speeds. e gear transmitters have a lot of
advantages, such as a stable gear ratio, quiet opera-
tion but not complicated construction, and small size.
Usually, the forming or the generating method were
used to fabricate the gears. In the forming method,
the machining process was carried out with a modu-
lar milling tool that matches with the gear module
1
.
Besides, the gears can also be machined by hobs, gear
shaper tools, and rack-type generating tools in the
generating method
2–7
.
For improving the machining performance of ma-
chining process, the end-mill was applied to cut the
gears using computer numerically controlled (CNC)
machine. e cutting tools movement were set up
and calculated with Computer Aided-Manufacturing
(CAM) program. erefore, the machining period of
the gears will be reduced and the productivity will be
increased
8–11
.
In order to increase the high load capacity, good
strength and high precision transmission of the gears,
the gear surfaces are oen tempered and treated to
achieve the appropriate hardness
12–14
. However, the
surface quality of the gears has been reduced aer the
heat treatment processing
15–17
. erefore, the gear
surface aer heat treatment processing will be grinded
to improve the surface quality and the time-life of
the gear. e cutting process was performed simul-
taneously by many abrasive grains with dierent cut-
ting edges randomly distributed on the surface of the
grinding wheels. As a result, the surface roughness
of the gear was achieved about Ra of 1.0 – 0.2 μ m
during grinding process
18–20
. However, the nished
grinding process of gear surfaces will be faced many
problems due to the complicated shape of the gear.
Consequently, this process requires not only complex
machining trajectory but also high machining condi-
tions. e result is a large machining time and high
cost for the grinding process.
In the working process of gears, the corrosion, fa-
tigue and wear resistance were depend on the surface
roughness of gear. It is an important indicator for
evaluating the quality of tooth surfaces of gear. ere-
fore, in this study, the shear thickening uid polishing
(STFP) method was carried out and used to improve
the surface roughness of gear. e suggested method
Cite this article : Nguyen D N, Ly H A, Duong C. Simulation study on polishing of gear surfaces in
non-Newtonian fuid. Sci. Tech. Dev. J. – Engineering and Technology; 3(3):443-451.
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