Amin, A. K. M. Nurul and Mhd Jakin, Aiman and Husin, Hafiz and Mahmud, Md. Asif
(2011)
The effect of cryogenic cooling in machinability of stainless steel during turning.
In:
Advanced Machining Towards Improved Machinability of Difficult-to-Cut Materials.
IIUM Press, Kuala Lumpur, Malaysia, pp. 203-207.
ISBN 9789674181758
![[img]](http://irep.iium.edu.my/style/images/fileicons/application_pdf.png)  Preview |
|
PDF ( The effect of cryogenic cooling in machinability of stainless steel during turning)
- Published Version
Download (575kB)
| Preview
|
Abstract
A high cutting temperature inherently characterizes high production machining. Such a high
cutting temperature adversely effects tool life, dimensional and form accuracy and surface
integrity of the product. Currently, an effort is being made to control this problem by reducing
heat from the cutting zone through proper selection of machining parameters, cutting fluid
application and heat resistant tools. The objective of this project is to investigate the effect of
cryogenic cooling in machinability of stainless steel during turning. Cryogenic cooling is a
promising new technology, which economically addresses the current processes environmental,
and health, concerns. Cooling the cutting tool with liquid nitrogen (-320°F) is expected to
maintain tool hardness and life. Cooling the chip makes it brittle and aids removal. Because
nitrogen is an abundant atmospheric constituent and the quantities used are small, there is no
unfavorable environmental effect or health impact or coolant disposal cost, and the chips are
readily recycled. It was assumed that using cryogenic cooling during turning operation would
discover some improvement in machinability of stainless steel by using cryogenic cooling during
turning operationLarge number of research works performed in the area of metal cutting has
contributed towards understanding the basic principles of improving machinability. It is therefore
worthwhile to explore the possibility to strengthen the continuity of these works. This research
intends to emphasize on chatter analysis to establish a co-relation between chatter and
machinability, which is seldom highlighted by scientists and researchers. Chatter is an unwanted
phenomenon in machining due to its adverse effects on the product quality, operation cost,
machining accuracy, tool life, machine-tool bearings, and machine-tool life. The term defines
the self-excited violent dynamic motion between the cutting tool and work piece [1]. Chatter
analysis could be another accurate, precise, effective and efficient method to analyze
instantaneous cutting environment and performance. Cryogenic cooling is the cooling approach
to replace conventional coolant by liquefied gas in machining process [2]. In most cases, the
liquid nitrogen (LN2) is chosen because of its availability and cost. There were many research
works [3-5] on the application of cryogenic cooling to improve the machinability of the hard to
cut materials. Liquid nitrogen (LN2) as a cryogenic coolant has been widely investigated,
especially for machining hard to cut material [6,7]. Cryogenic cooling is being looked at as a
potential replacement of conventional mineral oil based coolants because the latter is being rejected on grounds on serious environmental and health problems that it causes [8]. It is
therefore essential to design efficient cryogenic cooling systems for high speed machining
applications of hard-to-machine materials. The impact of cryogenic cooling on chip breaking and
tool wear intensity during end milling and turning has been investigated by various researchers
[9] but there has not been any study on the impact of cryogenic cooling on chip formation and
chatter.
Actions (login required)
 |
View Item |
Download Statistics
Download Statistics