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innovations CASTING


Delivery of Anesthesia Machine Casting Is Pain-Free


for one of its anesthesia machines before deciding on permanent mold casting by Watry Industries, Sheboygan, Wis. The structural part houses the


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caster wheels and supports the weight of the unit, which includes large gas cylinders for certain applications. The housing was required to support substantial mechanical loads while also meeting the tough cosmetic re- quirements required of top- end medical equipment.


medical manufac- turer considered sev- eral manufacturing methods to produce the base component


T e medical manufacturer,


which asked to remain anonymous, considered injection molded plastic, structural foam, plastic cowling over a steel fabrication and various casting processes, including sand, permanent mold and diecasting, to make the part. After investigation, mechanical strength concerns elimi- nated some of the plastic construc- tion methods, and a cost analysis eliminated the fabrication options. According to Watry, aluminum


castings had a proven track record in similar applications, including other structural parts for medical applications such as ventilators and EKG carts. Based on the combina- tion of part and tooling cost, the


customer chose permanent mold for the application. Watry’s engineers participated in


technical reviews of the part with the customer’s engineering group and used process modeling software to analyze part and gating design and determine the optimum param- eters. Some design changes were incorporated into the part before the tooling was built. Watry heat treats, machines,


powder-coats and assembles the anesthesia machine base components in-house. T e metalcaster currently is tooling a follow-up program for a similar but larger part. 


For more information visit www.watry.com.


Watry industries often powder-coats medi- cal components, such as this anesthesia machine part, in-house.


This base component of an anesthesia machine produced in aluminum by Watry Indus- tries, houses the caster wheels and supports the weight of the medical unit, including large gas cylinders.


56 | METAL CASTING DESIGN & PURCHASING | Mar/Apr 2012


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