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Manufacture of a wear-resistant sliding surface
| Details |
Inventors: Shimizu, Tsutomu; Tarumoto, Kouji; Nanba, Satoshi;
Assignee: Mazda Motor Corporation (Hiroshima, JP)
Primary Examiner: Lawrence; Evan K.
Assistant Examiner:
Attorney, Agent or Firm: Fleit, Jacobson, Cohn & Price
A process for manufacturing a member having a wear resistant sliding surface. The process includes the steps of providing a metallic substrate having a surface covered by a photo-resist coating, forming the photo-resist coating with a pattern of hard and soft portions, removing the photo-resist coating at the soft portions to expose surface portions of the metallic substrate beneath the soft portions of the photo-resist coating, etching the metallic substrate with the hard portion of the photo-resist coating retained thereon to form pits in the surface portions of the metallic substrate, spraying molten filler material on the surface of the metallic substrate with the hard portion of the photo-resist coating thereon, to fill the pits with the filler material of a porous structure having an oil-retaining capability, and removing the hard portion of the photo-resist coating from the metallic substrate. |
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DETAILED DESCRIPTION It is therefore an object of the present invention to provide a simple process for producing a sliding surface which provides a satisfactory oil-retaining capability even under a high sliding speed.
Another object of the present invention is to provide a simple and effective process for forming a durable sliding surface having a high oil-retaining capability.
A further object of the present invention is to provide a practical process for forming a sliding surface which can retain lubricant oil even under a high sliding speed.
According to the present invention, the above and other objects can be accomplished by a process comprising the steps of providing a metallic substrate having a surface covered by a photo-resist coating, forming the photo-resist coating with a pattern of at least one hard portion and a plurality of soft portions, removing the photo-resist coating at the soft portions to expose surface portions of the metallic substrate beneath the soft portions of the photo-resist coating, etching the metallic substrate with the hard portion of the photo-resist coating retained thereon to form pits in said surface portions of the metallic substrate, spraying molten filler material on the surface of the metallic substrate with the hard portion of the photo-resist coating retained thereon to fill the pits with the filler material of a porous structure having an oil-retaining capability, and removing the hard portion of the photo-resist coating from the metallic substrate.
In a preferred aspect of the present invention, the filler material is molybdenum or chromium-based material.
The substrate may be made of cast iron.
Where desired, the substrate may be plated at the surface with chromium.
Preferably, the photo-resist coating has the capability of catching the sprayed filler material in the cured condition so that the filler material sprayed on the photo-resist coating is prevented from being dispersed.
It is preferable that the pits are filled by the filler material substantially to the surface of the substrate so that a substantially flush surface is formed in the substrate
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