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10 Cards in this Set
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The basic mechanism for chip formation is by shearing.
[TRUE or FALSE]? |
TRUE
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A built-up edge (BUE) consists in layers of material from the workpiece that gradually are deposited on the tool tip.
[TRUE or FALSE]? |
TRUE
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The tendency for BUE formation can be reduce by the following means:
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Increase the rake angle
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Grooves in the cutting tools cannot act as chip breakers
[TRUE or FALSE]? |
FALSE
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Using Taylor for tool life and letting n=0.5 and C=400, calculate the percentage of the increase in tool life when the cutting speed is reduced by 50%
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300%
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Metal Carbides are harder than Ceramics
[TRUE or FALSE]? |
FALSE
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For machining steel and cast iron, the diamond is the recommended tool.
[TRUE or FALSE]? |
FALSE
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A machining operation is being carried out with a cutting fluid that is an effective lubricant. What will be changes in the mechanics of the cutting operation if the fluid is shut off?
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The chip will become thicker
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Diamond tools work very well at high temperature (higher than 1000 Celsius)
[TRUE or FALSE]? |
FALSE
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Assume that, in orthogonal cutting, the rake angle is 15 and the coefficient of friction is 0.2. Using the equations:
to/tc=sin/cos(-α); =45°+ α/2 - ß/2; µ=tan ß |
>> 16%
α = rake angle = shear angle ß = friction angle µ = coefficient of friction t0 = depth of cut tc = chip thickness to/ tc = cutting ratio or chip-thickness ratio α = 15° = 45° + 15/2 – 11.3099/2 = 46.85° to/ tc =sin (46.85)/cos (46.85-15) = 86% to/ tc =sin (41.6)/cos (41.6-15) = 74% (0.2) = ß 11.3099 = ß 2 µ = tan ß (0.2) = ß 21.8° = ß = 41.6° |
