Surface Finish Pays Dividends By Donald Mi/back, Gray-Syracuse, Inc.


As is the case with all castings used in the food processing industry, this part had to be metallurgically sound and free of surface imperfections. It is a 303 stainless investment casting which was slightly more expensive than its sand cast counterpart, but which provided cost savings through the elimination of rough and finish grinding which had required 2 to 3 hours per piece. Only one-half hour was needed to polish the investment casting to the desired finish.


Additional savings were provided by casting several holes which previously had been drilled.


Stainless Steel Fitting Cuts Finishing Costs


By Owen W Hale, Independent Steel Castings Co., Inc.


An inner fitting for a milk metering valve on a paper bottle filler was originally produced from solid bar stock by Fitting Specialties Corp. of Zion, Illinois. Machining from bar stock entailed considerable hogging by milling operations and left heavy burrs.


Chet Petersen, President of Fitting Specialties Corp., considered sand and investment castings as a means of eliminating the excessive stock removal. Investment casting was selected because of the savings in polishing the as-cast surfaces.


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Independent Steel Castings Co., Inc., was given the job of producing the part as an investment casting in 316 stainless steel that would only require lathe operations for finishing and polishing. The tooling cost for producing the wax pattern mold was paid for on the first one hundred piece order, and a fifty percent savings realized on all subsequent purchases.


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