An in-depth understanding of the milling process
INTRODUCTION
Milling process (of a machine) is to cut or shape
metal using a rotating tool. Milling machine possesses tools with a
wide range of metal cutting capability. Many complex operations such
as indexing, gang milling, and straddle milling and so on can be
accomplished on a milling machine.
TYPES OF MILLING MACHINE
A
achine is constructed of column and knee structure and classified
into two types namely: Horizontal Milling Machine and Vertical
Milling Machine. The name Horizontal and Vertical is due to its
spindle axis to the machine. Horizontal machines are further
categorized into Plain Horizontal and Universal.
Horizontal Milling Machine
The
spindle axis is placed on the horizontal axis of the machine.
Following functions are involved: Column, Knee,
Saddle, Table, Arbor, Base, Spindle, Spindle Reverse Lever, Spindle
Speed Selection Lever, Spindle Clutch Lever, Feed Rate Selection
Lever, Motor Start and Stop Buttons
Vertical Milling Machine
In
this type, the spindle is mounted in the vertical position with
additional features such as milling head and ram.
HIGH-SPEED MILLING OF DIFFERENTMATERIALS
High
cutting speed can increase the machining operations productivity and
the quality of products. Milling can be implemented on different
materials, here we are going to discuss milling on two selected
materials Graphite and Titanium.
High-speed milling of Graphite
Milling
graphite is the widely used
electrode material in EDM (Electrical Discharge Machine) operations,
it has higher cutting speeds can be used as compared to the machining
of metal materials.Cutting tests were performed for determining the
behavior of high-speed milling operations with graphite.
High-speed milling of Titanium
High-speed
milling of titanium is possible. In titanium cutting the round must
be kept sharp to avoid high cutting temperature and force. Tools
should be replaced when wear occurs. Titan possesses low plasticity
so the cutting of the edges must be very complex.

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