5 results listed
AISI 304 stainless steel accounts for approximately
50% of the world's stainless-steel production and consumption.
It is important to improve the machinability properties of
stainless steels due to the intensive use in the industry. In this
study, the effect of machining parameters on surface roughness
was investigated in water jet turning of AISI 304 material. The
test parameters were determined as nozzle feed rate, abrasive
flow rate, turning speed of the chuck and nozzle distance. During
the experimental study, the pump pressure (380 MPa), the
abrasive size (80 Mesh in Garnet form) and the nozzle diameter
(0.75 mm) were kept constant. According to the experimental
results, the surface roughness decreased as the turning speed and
the abrasive flow rate increased. On the other hand, the surface
roughness value increased as the nozzle feed rate and nozzle
distance increased.
International Iron & Steel Symposium
UDCS
Fuat KARTAL
M. Hüseyin ÇETİN
Hasan GÖKKAYA
—A non-conventional material removal process,
Abrasive Water jet (AWJ) machining is also an ideal
manufacturing process for very hard materials. This study aims
to optimize the parameters involved in AWJ machining of 316
stainless steel material such as abrasive material grain size, nozzle
speed, standoff distance, abrasive mass flow rate and pumping
system pressure. The analysis of the impact of parameters
involved in this study was conducted using the L27 Taguchi
orthogonal array, S/N ratio and ANOVA. Five controllable factors
were used to obtain the minimum surface roughness and each
parameter was assigned with three different values in order to
define the optimal factor and level combination. Results showed
that the surface roughness is in strong correlation with abrasive
material grain size. The findings of this study suggest that the
study design used is much more effective than the full factorial
design in terms of the number of experiments conducted.
International Iron & Steel Symposium
UDCS
Fuat KARTAL
Hasan GÖKKAYA
This study investigates the impact of processing
parameters on the surface roughness in the process of
abrasive water jet. The sample was machined using abrasive
water jet for four different parameters of Nozzle feed rate (5,
15, 25 and 35 mm/min), abrasive flow rate (100, 150, 200 and
250 g/min), spindle speed (50, 100, 150 and 200 rpm) and nozzle
distance (2, 6, 10 and 14 mm). Pump pressure (380 MPa),
abrasive size (80 Mesh, in Garnet form), and nozzle diameter
(0.75 mm) are kept constant throughout the empirical study.
According to the results obtained from the experiment,
increasing machining parameters, namely nozzle feed rate and
nozzle approach distance, resulted in increased average surface
roughness. On the other hand, increased spindle spin and
abrasive flow rate result in enhanced average surface
roughness (Ra).
International Iron & Steel Symposium
UDCS
Fuat KARTAL
Hasan GÖKKAYA
Inconel 718 is commonly sought after for its
resistance to high temperature and corrosion, however, these
characteristics reduce the machinability of this material which
brings forth the AWJ machining, a non-conventional material
removal process, as the ideal option. The use of Abrasive
Waterjet (AWJ) machining for Inconel 718 offers desired
machining characteristics, therefore, has a commercial
significance. The objective of this study is to optimize input
parameters of AWJ machining involved in AWJ machining of
Inconel 718 using the Taguchi technique. Optimization of AWJ
machining parameters was conducted based on the analysis of
variance (ANOVA) and Signal-to-Noise (S/N) Ratio analysis in
order to obtain effective Surface Roughness and Material
Removal Rate. AWJ machining parameters such as abrasive
flow rate, focusing tube size, traverse speed and water pressure
were calculated for optimized Surface Roughness and Material
Removal Rate. It was concluded that the optimal AWJ
machining parameters found in this study are satisfactory for
the actual/commercial machining of Inconel 718.
International Iron & Steel Symposium
UDCS
Fuat KARTAL
Hasan GÖKKAYA
Refik POLAT
In this paper, Taguchi technique is selected in order
to explore ideal process parameters for abrasive water jet
machining (AWJM). The goal of this exploratory research is to
explore the effects of machining parameters on MRR and SR of a
work piece made of aluminum a356 alloy. Our approach is based
on Taguchi's technique, ANOVA and the SN ratio in order to
optimize AWJ machining process parameters for successful
machining and to establish optimal values of each AWJM
parameter, namely, abrasive stream rate, traverse speed, standoff
distance and abrasive grit size. L9 orthogonal array is utilized for
varying values of A, B, C, D and three tests were conducted for
each combination. Using the SN ratio, it was possible to find the
optimal parameter values for AWJM. It was concluded that, in
actual practice, the ideal combination of AWJM process
parameters fulfill the requirements for machining of cast A 356
aluminum alloy.
International Iron & Steel Symposium
UDCS
Fuat KARTAL
Hasan GÖKKAYA
Refik POLAT