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Many design configurations are possible with sintered porous bronze. However, draft angles are usually required. Although plate and disc designs require little or no taper, hollow cylindrical shaped parts should be designed with a minimum of 1° taper per side to facilitate manufacturing of the parts at lower costs. Tapers of as little as 1/2° per side are possible, but result in higher costs.
Configuration design is similar to sand casting design. Undercuts almost always require a secondary machining operation or extremely complex molds.
When properly designed, inserts can be bonded directly to the powder during the sintering cycle. Selected insert materials should have melting points above sintering temperatures (maximum 1700°F). Steel, commercial bronze and beryllium copper are recommended insert materials. Brass, due to its low melting point and zinc vaporization, should be avoided when used in the direct bond application.
Furnace door openings sometimes limit the physical size of parts. However, ARROW makes frequent additions of modern equipment to its manufacturing facilities. Please refer to our plant for latest size limitations and capacities. Typical tolerances which can be held without secondary operations follow, see tables and charts.
