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In an ultrasonic machining (USM) process, the material removal rate (MRR) is plotted as a function of the feed force of the USM tool. With increasing feed force, the MRR exhibits the following behavior:
- increases linearly
- decreases linearly
- does not change
- first increases and then decreases
Correct answer: first increases and then decreases
Solution
The material removal rate in ultrasonic machining initially increases with feed force due to enhanced contact and energy transfer, but after a certain point, excessive force can lead to tool wear or reduced vibration efficiency, causing the MRR to decrease.
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