Introduction To Milling Machine:
Milling machine is the main machining operations. In this process workpiece is fed beside a
turning cylindrical tool. Turning tool has of several cutting edges. Milling process is notable as
of other machining operations on the foundation of direction between the tool axis with the
feed direction, though, in other operations similar to drilling, turning, and so on. The tool is fed
in way parallel to axis of rotation. Milling machine can also use for slotting, drilling, make a
circular profile with gear cutting by having proper attachments.
Cutting tool use in milling operation is call milling cutter, which has of numerous edges call
teeth. Machine tool to make the milling operations by produce necessary relative movement
among workpiece and tool is call milling machine. It gives necessary relative motion under
extremely controlled condition.
Generally, milling function creates plane face. Other geometries can too be formed through
milling machine. Milling process is consider an episodic cutting process teeth of milling cutter
go into and go out the work through every revolution. This periodic cutting action subjects
teeth to a cycle of impact force with thermal shock on each rotation. Tool material and cutter
geometry have to be intended to bear the over stated situation.
Milling is a basic machining process by which a surface is generated by progressive chip removal.The workpiece is fed into a rotating cutting tool. Sometimes the workpiece remains stationary,and the cutter is fed to the work.In nearly all cases,a multiple-tooth cutter is used so that the material removal rate is high.Often the desired surface is obtained in a single pass of the cutter or work and, because very good surface finish can be obtained,milling is particularly well suited and widely used for mass-production work.Many types of milling machines are used,ranging from relatively simple and versatile machines that are used for general-purpose machining in job shops and tool and die work (these are NC or CNC machines) to highly specialized machines for mass production.Unquestionably, more flat surfaces are produced by milling than by any other machining process.
Specification Of Milling:
Along by the type of milling machine, it has to be specifying with its size. Commonly size of a
typical milling machine is selected as given below:
1. Size of worktable with its movement range table length x table width like 900 x 275 mm.
Table movements: Longitudinal travel x Cross x Vertical like 600 x 200 x 400 mm.
Over travels point to maximum movement in a direction.
2. Maximum longitudinal movement and cross feed of the table.
3. Number of feeds presented (give their values).
4. Number of spindle speeds (give their values).
5. Maximum distance the knee can travel.
6. Power of the main drive motor.
7. Number of spindle speeds.
8. Floor space necessary.
9. Total power existing.
10. Spindle nose taper.
11. Net weight.
CLASSIFICATION OF MILLING MACHINE
The four most common types of manually controlled milling machines are listed below in order of increasing power (and therefore metal removal capability):
1. Column and knee type milling machines
(a) Hand milling machine
(b) Horizontal milling machine
(c) Universal milling machine
(d) Vertical milling machine
2. Planer milling machine
3. Fixed-bed type milling machine
(a) Simplex milling machine.
(b) Duplex milling machine.
(c) Triplex milling machine.
4. Machining center machines
5. Special types of milling machines
(a) Rotary table milling machine.
(b) Planetary milling machine.
(c) Profiling machine.
(d) Duplicating machine.
(e) Pantograph milling machine.
(f) Continuous milling machine.
(g) Drum milling machine
(h) Profiling and tracer controlled milling machine
Milling machines whose motions are electronically controlled are listed in order of increasing production capacity and decreasing flexibility:
1. Manual data input milling machines
2. Programmable CNC milling machines
3. Machining centers (tool changer and pallet exchange capability)
4. Flexible Manufacturing Cell and Flexible Manufacturing System
5. Transfer lines