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Consider the following statements with respect to the relief angle of cutting tool:
1. This affects the direction of chip flow.
2. This reduces excessive friction between the tool and workpiece
3. This affects tool life
4. This allows better access of coolant at the tool workpiece interface
Which of the statements given above are correct?
[PI 2004]
  • a)
    1 and 2
  • b)
    2 and 3
  • c)
    2 and 4
  • d)
    3 and 4
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Consider the following statements with respect to the relief angle of ...
Provides flank inclination to relief from elastic recovery so less rubbing action, hence low flank wear.
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Consider the following statements with respect to the relief angle of ...
Relief Angle of Cutting Tool

The relief angle of a cutting tool refers to the angle formed between the cutting edge and the surface of the tool immediately behind it. It plays a crucial role in the cutting process, affecting various aspects of tool performance and workpiece quality. Let's analyze each statement to determine which ones are correct.

1. This affects the direction of chip flow.
The relief angle of a cutting tool does indeed affect the direction of chip flow. When the relief angle is properly set, the chips produced during the cutting process are directed away from the cutting edge and the workpiece, preventing them from interfering with the machining operation. This ensures smoother chip evacuation and reduces the chances of chip recutting. Therefore, statement 1 is correct.

2. This reduces excessive friction between the tool and workpiece.
The relief angle also plays a crucial role in reducing excessive friction between the tool and the workpiece. By providing a clearance angle, the relief angle allows the cutting edge to come into contact with the workpiece material only at the desired location. This reduces frictional forces, heat generation, and tool wear. Consequently, statement 2 is correct.

3. This affects tool life.
The relief angle significantly affects tool life. When the relief angle is properly set, it helps prevent rubbing and excessive tool wear, thereby extending the tool's life. Moreover, a well-designed relief angle ensures efficient chip evacuation, reducing chip clogging and preventing chip recutting. Both of these factors contribute to improved tool life. Thus, statement 3 is correct.

4. This allows better access of coolant at the tool-workpiece interface.
The relief angle has no direct influence on the access of coolant at the tool-workpiece interface. The primary factors that affect the coolant flow in this region are the design of the cutting tool, tool geometry, and the use of appropriate coolant delivery systems. Therefore, statement 4 is incorrect.

In conclusion, the correct statements are:
- Statement 1: This affects the direction of chip flow.
- Statement 2: This reduces excessive friction between the tool and workpiece.
- Statement 3: This affects tool life.

Therefore, the correct answer is option 'B' - 2 and 3.
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