Today we will learn about types of milling machine used in machining
of metal work pieces. In my last post we have learn about milling machine and its main parts and we know that milling machine is one of the most versatile
machine which can perform any machining operation on unsymmetrical work piece.
It is mostly used in mold manufacturing. Due to its versatility, it is available
milling machine available various types and sizes. These are described below.
Types of milling machine:
There are various milling machines are used in mechanical
industries. These are described below.
1. Column and knee type milling machine:
It is the very common milling machine type. In this machine
a vertical column is attached to the bed which consist all gear drives which rotate
the knee and saddle. A knee is situated on the base which can provide vertical
motion to the work piece or which can move up and down. A saddle is attached to
the upper section of the knee which can move in transverse direction. The table
is placed over the which can hold the work piece by use of climbing bolts.
Vertical milling machine:
In is one of the types of knee and column milling machine. The
spindle if this machine is in vertical position. No arbor is required in this machine.
The cutter tool has cylindrical shape and the cutting edges are situated at the
circumference of the cylindrical face.
Horizontal milling machine:
As the name implies the spindle is situated horizontally. The
spindle rotates horizontally. A arbor is attached to the machine which holds
the cylindrical disk shape cutter which cuts the metal work piece.
Universal milling machine:
The universal milling machine is same as horizontal milling machine
except there is a arrangement of swing up the table to 45 degree in either direction.
2. Fixed bed milling machine:
In this milling machine the bed of the machine is fixed to
the machine. There is no arrangement of knee and saddle which can move vertically
and transversally. The worktable is direct situated at the fixed bed. The spindle
of this machine is mountain on a movable spindle head. It can move in vertical
and horizontal direction and perform the cutting operation.
Simplex milling machine:
In the simplex machine spindle head or the spindle can travel
only in one direction. Mostly it travels in vertical direction.
Duplex milling machine:
In this machine the spindle can travel both in vertical and
horizontal direction.
Triplex milling machine:
In triplex machine spindle can move in all three direction along
X Y and Z axis.
3. Planner milling machine
Planner milling machine is mostly used for facing operation
in mass production. These machine are similar to the bed type milling machine
except it can mounted with various cutters and spindle heads to the machine.
These cutters can perform the facing operations simultaneously.
4. Special milling machine:
These machines are the modern milling machines which are developed
to easy the milling operations according to the jobs.
Tracer milling machine:
Tracer machine can perform all difficult die making job by synchronizing
the tracing unit. It can develop any difficult shape. It is mostly used in automobile
and aerospace industries.
CNC milling machine:
CNC is most versatile
milling machine which is control by a computer. It is upgrade version of bed type
milling machine in which the spindle can move in all three direction and the
table can rotate 360 degree. These all movement is hydraulically controlled
which is command by a computer. Any difficult geometry can make on it. A sketch
of the work piece is loaded to the computer which is cut on work piece by the
cutters automatically.
Today we have discussed about main types of milling machine.
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