Milling Process - Definition and Principle

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Definition of Milling Process

  1. A milling machine is a machine tool that removes metal as the work is fed against a rotating multipoint cutter. 
  2. The milling cutter rotates at high speed and it removes metal at a very fast rate with the help of multiple cutting edges. 
  3. One or number of cutters can be mounted simultaneously on the arbour of the milling machine. This is the reason that a milling machine finds wide application in production work. 
  4. A milling machine is used for machining flat surfaces, contoured surfaces, surfaces of revolution, external and internal threads, and helical surfaces of various cross-sections.
Typical components produced by a milling are given in the figure. In many applications, due to its higher production rate and accuracy, milling machine has even replaced shapers and slotters.

What is the principle of milling process?

  1. In a milling machine, the metal is cut by means of a rotating cutter having multiple cutting edges. For cutting operation, the workpiece is fed against the rotary cutter. 
  2. As the workpiece moves against the cutting edges of the milling cutter, metal is removed in-form chips of trochoid shape. 
  3. Machined surface is formed in one or more passes of the work. The work to be machined is held in a vice, a rotary table, a three jaw chuck, an index head, between centres, in a special fixture or bolted to the machine table. 
  4. The rotatory speed of the cutting tool and the feed rate of the workpiece depending upon the type of material being machined. 
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