Classification of milling machine

i have made a seminar topic on classification of milling machine for my 3rd sem engineering semister have fun guys

1. AMIRAJ COLLEGE OF ENGINEERING & TECHNOLOGY. Singh Abhishek Ravinder Semister-3 rd Mechanical Dept.

2. Classification of Milling Machines 2

3. MILLING Milling is another basic machining process by which surface is generated progressively by the removal of chips from a work piece as it is fed against a rotating cutter. Milling operations can be classified into two broad categories 1. Peripheral Milling 2. Face Milling 3

4. Peripheral Milling 4

5. Peripheral Milling Operation performed by milling cutter to produce a machined surface parallel to axis of rotation of cutter Cutting force is not uniform throughout the length of the cut by each tooth Quality of surface generated and shape of the chip formed depends upon the rotation of cutter relative to direction of feed movement It can be either UP milling or DOWN milling 5

6. Up milling Also called conventional milling, - Wheel rotation opposite of the feed - The chip formed by each cutter tooth starts out very thin and increases its thickness - The length of the chip is relatively longer - Tool life is relatively shorter - Need more clamping force to hold the work part still. 6

7. Down milling: Also called climb milling , - Wheel rotation is parallel to the feed - The chip formed by each cutter tooth starts out thick and leaves out thin - The length of the chip is relatively short - Tool life is relatively longer - Need less clamping force to hold the work part still. 7

8. Face Milling 8

9. Face Milling The generated surface is at right angles to the cutter axis It is the combined result of actions of the portions of the teeth located on both periphery and the face of the cutter Most of the cutting is done by the peripheral portions of the teeth, with the face portions provides the surface finish. 9

10. MILLING MACHINES 10

11. Milling Machines The milling machine supplies an accurate rotating spindle for the cutter and a table (vise) to fix and position the work part. Types of Milling Machines are -: Column & Knee Type Fixed Bed Type Planer Type Special Type 11

12. Column & Knee Milling Machine 12 General purpose Column, spindle, cutter, table, knee, base are the common parts of the vertical and horizontal milling machines The milling machines having only the three mutually perpendicular table motions (x-y-z axes) are called plain column and knee type Vertical type is especially well suited for face and end milling operations

13. Horizontal Milling Machine 13 In horizontal, arbor supports the cutter and an over arm supports arbor The vertical column houses the electrical, main drive, spindles etc mounted on a heavy base

14. 14 Universal Milling Machine Has a table that can be rotated in a horizontal plane to any specified angle

15. Bed Type Milling Machine 15

16. Milling Operations 16

17. 1. Plain Milling(Slab Milling) Operation of production of plane flat surface parallel to axis of rotation of plain milling cutter Cutter width extends beyond the work piece on both sides 17

18. 2. Face Milling The face milling cutter is rotated about an axis perpendicular to the work surface 18

19. 19 More Examples on Face Milling

20. 3. End Milling Combination of peripheral and face milling Cutter has teeth both on end face and periphery Vertical milling machine is most suitable for end milling operation 20

21. 4. Side Milling Operation of production of flat vertical surface on side of work piece by using side milling cutter Depth of cut adjusted by rotating vertical feed screw of the table 21

22. 5. Straddle Milling Operation of production of flat vertical surfaces on both side of the workpiece by using two side milling cutters mounted on the same arbor 22

23. 6. Angular Milling Operation of production of angular surface on a workpiece other than at right angles to the axis of milling machine spindle 23

24. 7. Gang Milling Operation of milling several surfaces of the workpiece simultaneously by feeding the table against a number of cutters having same or different diameters 24

25. 8. Form Milling It is the operation of production of irregular contours using form cutters The contours maybe convex, concave or any other shape 25

26. 9. Profile Milling It is the operation of reproduction of an outline of a template or complex shape of a master die on a workpiece 26

27. 10.Milling Keyways, Grooves & Slots Operation of production of keys, grooves and slots of varying shapes and size by using a plane milling cutter, a metal slitting saw, an end mill or by side milling cutter 27

28. 11. Thread Milling Operation of production of threads by using a single or multiple thread milling cutter. It is performed in special thread milling machine to produce accurate threads 28

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