| 摘要 |
PROBLEM TO BE SOLVED: To secure the sticking intensity of thermal-spraying layer at the upper end part or the lower end part of a product by arranging a masking member having smaller inner diameter than the inner diameter of a cylinder at the upper end part of the cylinder and thermalspraying the metal onto the inner surface of the cylindrical product. SOLUTION: At the upper end part of the cylinder block 5, a part where the thermal-sprayed layer (film) 4 is not formed, is developed because the shadow of the masking 3 develops. Further, since thermalspraying flame 2 from a thermal-spraying gun 1 has some degree of the width, the film thickness at the shadow part is gradually reduced. The difference of the inner diameters between the masking member 3 and the cylinder block 5, is set so that the thermal-sprayed layer 4 formed to both do not continue. The setting range is made to be >=1.5 times and <=1.5 mm of the film thickness formed on the inner surface to the diameter. By this method, at the upper end part of the cylinder block 5, such troubles as to develop the burr on the upper surface and the breakage, exfoliation, or the like of the film at the time of taking out the masking member, are avoided. |
