加拿大外贸
Mold halves used in Landing Products injection molding machines are manufactured using computer controlled vertical milling machines which have automatic tool calibration and tool change features. Each mold half is cut with a series of cutting tools using progressively smaller tool radii and finer mesh spacing. Once started, the operations required to cut a mold half are completely automatic. A minor amount of hand polishing of the mold cavity is performed after the milling operations are complete.During an injection molding production run, fine adjustments may be made, if required, to mold position within the molding machine to control propeller balance. Molding machine parameters, once set, are stored electronically for subsequent use to assure consistency between batches.
Larger propellers are retrieved from the injection molder with a robotics machine. The only postoperative manufacturing requirement is drilling of the prop shaft hole which uses a guide hole provided by a pin resident within the mold.
Materials
The molding compound used in APC propellers is manufactured using a pultrusion process. This method causes the fiberglass "fibers" to be oriented axially in 1/2" long pellets. This long fiber compound allows a higher fiber (60%) to resin (nylon binder) density than short or chopped fiber compounds. Viscous (skinning) effects during injection molding cause these long fibers to remain dominantly oriented in the propeller span-wise axis. This provides substantially higher strength and stiffness compared to more conventional processes which use short or chopped fibers. While both more costly and difficult to manufacture, the performance advantages of long fiber composites are substantial, as shown on the following table.
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