Answer:Explained
Step-by-step explanation:
Vacuum Permanent- mold casting is a manufacturing process that uses low pressure or vacuum force to draw the molten metal into the casting cavity.
Thin walled section can be manufactured by this technique with good surface finish and close tolerance.
Vacuum mold casting also known as V process is a manufacturing process in which unbind-ed sand is held together with the help of vacuum rather than by a chemical binder.The pattern is vented so that vacuum can be applied in it.It is slow process with good surface finish of the order of 125 to 150 rms.