Surface-treated product, surface-treatment method, and surface-treatment apparatus
AssigneeAsahi Tec Corporation
InventorsShiro Kawashima, Hiromi Akihori, Matuo Suzuki, Hidekatu Hirahara, Aturo Yamamoto, Katuya Kawamori
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Abstract
There is provided a surface treated product that moves relatively in a fluid, wherein a surface of the surface treated product has continuous dimples, each dimple having a diameter of 10 to 2500 μm and a depth of 50 μm or less. The surface treated product significantly reduces resistance of a fluid to an object in the fluid, and significantly improves a flow state of the fluid.
Claims16
A hollow casting, in which continuous dimples, each of which has a diameter of 10 to 2500 μm and a depth of 50 μm or less are formed on an internal surface of the hollow casting, the entire continuous dimples and their edges being formed to be smooth.
A method for treating an internal surface of a hollow casting, the method comprising the steps of placing a surface treatment material containing at least a polyhedral or spherical material having a diameter of 5 mm or more inside a hollow casting, subsequently colliding the surface treatment material with the internal surface to cause the surface treatment material to form continuous dimples, each of which has a diameter of 10 to 2500 μm and a depth of 50 μm or less on the internal surface of the hollow casting.
Dependencies are inferred from the claim text.