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(guides out) the intake air in a centrifugal direction. In this manner, the cooling fan151serves to cool the commutator137, brushes145(shown in FIG. 3), the armature133and their surrounding parts by helping their heat dissipation. The air that has been used for such cooling by the cooling...
aThe metal moulds commonly require fine cavity surface. Many casting processes can fulfil this demand,and the vacuum casting process is an effective and convenient process.The significant advantages of vacuum casting parts include near net shape, thin walls,improved metallurgical purity and surface finis...