What is is Milling Machine and How its work ?

milling machine parts

Milling Process 

Milling can also be a cutting process that attempts to destroy material from a small piece surface using a milling cutter. The milling cutter can also be a rotary cutter, often with multiple cutting points. Against drilling, where the tool is advanced along its rotation axis, in milling the cutter is usually moved perpendicular to its axis, so that there is a cutting on the cutter's circumference. As the milling cutter enters the work piece, the cutting edges (flute or tooth) of the tool are repeatedly excavated and ejected from the fabric, removing chips (swarf) from the work piece with each pass. The cutting action is shear deformation; The material is pushed into small pieces by the work piece which relies on a larger or lesser extent (depending on the material) to make the chips. This makes metal cutting (in its mechanics) somewhat different from cutting soft material with a blade.

The milling process extracts the material by making several separate, small cuts. This is often accomplished by employing the cutter with multiple teeth, rotating the cutter at high speed, or moving the fabric slowly through the cutter; Often it is some combination of those three approaches. The speed and feed used are varied, corresponding to a mixture of variables. The speed with which the piece moves through the cutter is understood as feed rate or simply feed; It is the most frequently measured of the cloth per complete revolution of the cutter. 

Milling Machine Type 

  1. Vertical Milling Machine
  2. Horizontal Milling Machines

Vertical Milling Machines

vertical milling machine

The vertical mill features a vertically arranged spindle axis and rotate by staying at an equivalent axis. The spindle also can be extended and performing functions like drilling and cutting. Vertical mill possesses two further categories as well: turret mill and bed mill.

The turret mill possesses a table that moves perpendicularly and parallel to the spindle axis so as to chop the fabric . The spindle is, however, stationary. Two cutting methods are often performed with this by moving the knee and by lowering or raising the quill.

The other is that the bed mill during which the table moves perpendicular to the axis of the spindle and therefore the spindle moves parallel to its axis.

Horizontal Milling Machines
horizontal milling machine

The horizontal mill is additionally the similar cutter but their cutters are placed on a horizontal arbor. tons of horizontal mills have gotten rotary tables that help in milling in various angles. These tables are called the universal tables. aside from this all the tools that are utilized in a vertical mill also can be utilized in the horizontal mill

Main Parts of Milling Machine
Milling Machine Parts

Base:

This is the bottom part of a milling machine. All other parts are combined on this. It carries the entire load therefore it should have high compressive strength so that it is made by cast iron. It also serves as a reservoir of cutting fluids.

Column:

The pillar is another base part of the milling machine. It stands at the base. It supports knees, tables etc. Work as accommodation for all other driving members. It is a hollow member consisting of a driving gear and sometimes a motor for axles and tables.

Knee:

The knee is the first moving part of the milling machine. If placed on a column and moves along the slideshow located above the column. It is made of cast iron and runs vertically on slideshows. It moves sideways up and down which changes the distance between the equipment and the workpiece. It is operated mechanically or hydraulically.

Saddle:

It is placed between the table and the knee and acts as an intermediate part between them. This column can move transversely on the face. It slides on guide ways that are located at the knee that are perpendicular to the face of the column. Its main function is to move the work piece in a horizontal direction. It is also made by cast iron.

Table:

The table is located above the knee. It is the part of the machine that holds the work piece while machining. It is made of cast iron and has a T slot over it. The work piece is clamped using a clamping bolt. One end of the clamping bolt is fixed in this slot and the other is fixed on the work piece which holds the work piece. This can provide three degrees of freedom to the work piece.

Overhanging Arm:

It is located above the column on a horizontal milling machine. It is overhang on the surface of the column and the other end supports the arbor. It is made by cast iron.

Spindle:

The spindle is the main part of the machine that holds the tool in the correct place in the vertical milling machine and the arbor in the horizontal milling machine. It is a moving part that is in rotary motion. It is motor driven and drives the equipment. It has a slot at the front end. The cutting tool is fixed in that slot.

Arbor:

It is a mechanical part on which a horizontal milling machine is used as an extension part of the spindle. It is mounted on the spindle whenever necessary. It holds the device and moves it in the right direction.

Arbor supports:

It is used to support the arbor in the right place. One end of this support is combined with the overhanging arm and the other with the arbor.

Milling head:

This is the Top section of the vertical milling machine. This includes axles, driving motors and other control mechanisms.

RAM:

Rams serve as the overhanding arm in a vertical milling machine. One end of the arm is attached to the pillar and the other end is attached to the milling head.

Type of Process of Milling Machine 

Milling machine operation
there are many type of operation are processed by milling machine some of operation are as:

Milling Cutter

A lot of cutting tools are used in the milling process. Milling cutters, called end mills, have special cutting surfaces on their end surfaces so that they can be placed on the work piece by drilling. These also enhance the cutting surfaces on each side for the purpose of peripheral milling. Milling cutters have small cutters in the end corners. The cutters are made of highly resistant materials that are durable and produce less friction.

Surface Finish

Any material inserted through the cutting area of ​​the milling machine receives regular intervals. Side cutters have received regular ridges on them. The distance between the ridges depends on the feed rate, the diameter of the cutter and the amount of cutting surfaces. These can be significant changes in the height of surfaces.

Gang Milling

This means that more than two milling cutters are included in a setup similar to horizontal milling. All cutters perform the same operation or it may be possible that the cutter may perform different operations. This is an important operation for the production of duplicate parts.

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