GATE ME 2022 Set 2 — Question 54
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Manufacturing Processes → Machining & Machine Tools → Conventional Machine Tools
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Question
A straight-teeth horizontal slab milling cutter is shown in the figure. It has 4 teeth and diameter () of 200 mm. The rotational speed of the cutter is 100 rpm and the linear feed given to the workpiece is 1000 mm/minute. The width of the workpiece () is 100 mm, and the entire width is milled in a single pass of the cutter. The cutting force/tooth is given by , where specific cutting force N/mm, is the width of cut, and is the uncut chip thickness.
The depth of cut () is , and hence the assumption of is invalid. The maximum cutting force required is ________ kN (round off to one decimal place).
The depth of cut () is , and hence the assumption of is invalid. The maximum cutting force required is ________ kN (round off to one decimal place).
Correct answer
2.4 to 2.6
Solution
1.Feed per tooth ():
2.Uncut chip thickness ():
In slab milling, , where is the instantaneous angle of engagement.The maximum uncut chip thickness occurs at the maximum angle of engagement. Since , the engagement angle varies from to .
3.Maximum Cutting Force ():
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