Frog Switch: The Frog, Switch & Manufacturing Co

Production Process

	1.	The pattern (with vent holes) is placed on a carrier plate.
	2.	Plastic is drawn onto the pattern by a vacuum.
	3.	A flask is placed on the pattern and filled with dry, unbonded sand. The sand is compacted by vibration.
	4.	A second sheet of plastic is placed on top of the sand and a vacuum is applied to the flask. Atmospheric pressure then hardens the sand retaining the shape of the pattern.
	5.	Cope and drag assembly form a plastic-lined cavity. During pouring, molds are kept under vacuum.
	6.	After cooling, the vacuum is released, producing a sand-free, finished product.
Some key benefits of vacuum molding include: Casting-to-casting consistency Exact duplication of customer requirements for large castings Environmental soundness No chemical additives, low noise level, and no energy required to mix the sand Superior casting quality Excellent dimensional accuracy and a smooth, clean finish on all castings Zero pattern wear Because the sand never touches the pattern If the casting is too large, of low volume, or is too complex for the V-process, we can handle your requirements in our no bake facility. This line is capable of producing castings up to 40,000 pounds, making us one of the few manganese steel suppliers of the mining industry's large gyratory mantles. Questions or inquiries - contact a Frog, Switch dealer in your area.