During high-speed milling of aluminum alloy components, friction between the cutting tool and the workpiece causes the metal to expand significantly. Computer-guided milling machines are calibrated to cut workpieces strictly to specified target dimensions based on the instantaneous physical size of the material. Continuous liquid coolant is applied during milling to maintain the workpiece at ambient room temperature throughout the cutting operation.
Based on the passage, which of the following conclusions is most logically supported if an aluminum part is machined without coolant?
- AThe milling machine will automatically adjust its instantaneous tool position to offset the thermal growth of the metal.
- BThe friction generated during dry machining will cause the cutting tool to rapidly overheat and shatter.
- The finished workpiece will measure smaller than the specified target dimensions after cooling to ambient temperature.Cevap
- DThe uncooled aluminum part will remain permanently expanded and exceed target specifications after cooling.
Cevap
The finished workpiece will measure smaller than the specified target dimensions after cooling to ambient temperature.
The passage indicates that friction causes aluminum to expand during machining and that the machine cuts the part to target dimensions based on its instantaneous expanded size. When the coolant is absent, the part is cut while enlarged; once it cools to room temperature, the metal contracts, resulting in final dimensions that are smaller than specified.
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Drawing a logical conclusion by synthesizing cause-and-effect relationships and physical constraints described in a technical text.
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