Prudaction
1-Draw a sketch showing the cutting tool angles and state the function of each
[pic]
1-the thickness of the uncut layer (t1)
2- the thickness of the chips produced (t2)
3-the inclination of the chips-tool interface with respect to the cutting velocity i.e., the rake angle( )
4-the relative velocity of the workpiece and tool ( v )
2-Define orthogonal cutting -oblige cutting
|Oblique metal cutting |Orthogonal metal cutting |
|The cutting edge is inclined at an angle less than 90o to the |Cutting edge of the tool is perpendicular to the direction of |
|direction of tool travel. |tool travel. |
|The chip flows on the tool face making an angle. |The direction of chip flow is perpendicular to the cutting |
| |edge. |
|The chip flows side ways in a long curl. |The chip coils in a tight flat spiral |
|The cutting force acts on larger area and so tool life is more.|For same feed and depth of cut the force which shears the metal|
| |acts on a smaller areas. So the life of the tool is less. |
|Produces a chamfer at the end of the cut |Produces sharp corners. |
|For the same depth of cut greater length of cutting edge is in |Smaller length of cutting edge is in contact with the work. |
|contact with the work. | |
|This method of cutting is used in almost all machining |Generally parting off in lathe, broaching and slotting |
|operations.
[pic]
1-the thickness of the uncut layer (t1)
2- the thickness of the chips produced (t2)
3-the inclination of the chips-tool interface with respect to the cutting velocity i.e., the rake angle( )
4-the relative velocity of the workpiece and tool ( v )
2-Define orthogonal cutting -oblige cutting
|Oblique metal cutting |Orthogonal metal cutting |
|The cutting edge is inclined at an angle less than 90o to the |Cutting edge of the tool is perpendicular to the direction of |
|direction of tool travel. |tool travel. |
|The chip flows on the tool face making an angle. |The direction of chip flow is perpendicular to the cutting |
| |edge. |
|The chip flows side ways in a long curl. |The chip coils in a tight flat spiral |
|The cutting force acts on larger area and so tool life is more.|For same feed and depth of cut the force which shears the metal|
| |acts on a smaller areas. So the life of the tool is less. |
|Produces a chamfer at the end of the cut |Produces sharp corners. |
|For the same depth of cut greater length of cutting edge is in |Smaller length of cutting edge is in contact with the work. |
|contact with the work. | |
|This method of cutting is used in almost all machining |Generally parting off in lathe, broaching and slotting |
|operations.