Gears, Cogs, And Sprockets
Quaker City Castings supplies castings in a wide variety of materials to the gears manufacturing industry in parts up to several thousand pounds finished weight. Our broad range of ferrous materials and nickel-alloys combined with our familiarity with varying teeth designs makes us uniquely suited to supply a range of customer needs.
Although the casting process is used most often to make blanks that will have cut teeth, there are several variations of the casting process used to make toothed gears with little or no machining. Quaker City Castings has a broadly experienced team of engineers and foundry staff to ensure that all the chemical and mechanical requirements for your parts are met and that all necessary destructive and non-destructive testing is timely performed.
For example, cast-tooth internal gears can be produced in several sizes up to several thousand pounds. They are heat treated to strength levels of 689 MPa (100 ksi) and machining is not required on these gears. In circumstances where machining is necessary, the machining expense is reduced by casting closer to the final shape.
Most casting processes have been used to produce blanks or cast tooth gears including sand casting, shell molding, permanent mold casting, centrifugal casting, investment casting, and die casting. Cut gears have also been produced from continuously cast bars. Sand casting is one of the more commonly used casting methods in this market, and is used primarily to produce blanks. In recent times, there has been only very limited use of gears with teeth made by sand casting. In some instances gears for farm machinery, stokers, and some hand-operated devices have used cast teeth. The draft on the pattern and the distortion on cooling make it difficult to obtain much accuracy in cast iron or cast steel teeth.