MILLING OPERATION: The Milling Operation is a multipoint cutting tool machining operation used for removing a layer of material from the complete surface of the workpiece and it is also used for producing holes in the components.
In order to remove the material in the Milling Operation, the milling cutters will be used and are as follows.
Types of Milling Cutters-Milling Operation:
There are two types of milling cutters.
1.End Milling Cutter: If the cutting teeth are provided at the end face of the circular disc, it is called an End milling cutter. End mill cutter is used either with a vertical milling machine or by using drilling machine also.
- It is used only with horizontal milling machine.
- Peripheral milling cutter is mounted on the expandable shaft called as Arbor.
- If the peripheral milling cutter is superimposed on the end mill cutter called as side end mill cutter.
4. Straddle Milling Cutter: In addition to the periphery, if the cutting teeth are provided on faces also called aa s straddle milling cutter. I.e. End milling cutter is superimposed on to the peripheral milling cutter.
Types of Milling Operations:
They are two types of milling operations.
1.Face Milling Operation and
2.Slot or Slab Milling Operation.
1.Face Milling Operation:
If the milling operation is used for removing a layer of material from a complete surface of the workpiece is called as face milling operation.
2.Slot/Slab Milling operation:
If the milling operation is used for producing slots in the component is called as slab or slot milling operation.
In general, both the types of milling operations will be performed by using both the type of milling cutters but it is preferable to perform face milling operation with end mill cutter and slab milling operation with a peripheral milling cutter.
When peripheral milling cutter is used for performing the milling operation there are two methods of milling will be used.
Methods of Milling Operation:
There are two methods of Milling Operations.
1.Up Milling or Conventional Milling
2.Down Milling or Climb Milling.
In UP milling, the direction of movement of workpiece and direction of rotation of the tool is opposite whereas in down milling the directions are same.
In UP milling, because of the opposite direction, the forces, power consumption, and tool wear are high whereas tool life is low.
In case of down milling, because of the same direction, forces, power consumption, and tool wear are low and tool life is longer.
In UP milling, the thickness is varying from minimum at the beginning to the maximum towards the end whereas in Down Milling operation the uncut chip thickness is varying from maximum at the beginning to the minimum towards the end.
Because of large uncut chip thickness at the end, the surface finish produced is poor in Up Milling whereas in Down Milling because of the small uncut chip thickness at the end, the surface finish is better.
In Up milling because of opposite direction, the tool is lifting the workpiece upwards, therefore strong work holding devices are required whereas in Down milling because of the same direction, forces are less and strong holding devices are not required.
Therefore based on the above, it is preferable to use the Down milling.
This is the detailed information about Types of Milling Cutters, Milling Operations, Methods of Milling Operation, etc. If you have any doubt, then you can contact us from the comments section.