Identify four advantages and two disadvantages of using aluminum rather than tool steel to make cavities for injection molds

What will be an ideal response?


Aluminum advantages:

Lower initial cost due to lower machining time Shorter delivery time
More even heat distribution
Shorter cycle from higher thermal conductivity Lighter weight

Easier to cast should that be the preferred fabrication method

Aluminum disadvantages:
Must be anodized to get hardness and anodizing may wear off
Long-term wear us high

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Light slag can be removed from the edge of the cut surface by using a _____ file and running it from the inside of the pipe, holding it at a low angle and knocking lightly attached slag from the inside of the pipe.? ?  

Fill in the blank(s) with the appropriate word(s).

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As runoff water flows across a grassed buffer strip, the concentrations of N and P in the water decrease slowly at first, but if the buffer strip is sufficiently wide, major reductions in these concentrations will occur just before the water leaves the buffer

Indicate whether the statement is true or false

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Summarize briefly the general requirements and related safety practices for the operation of cranes and derricks

What will be an ideal response?

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