| 摘要 |
The invention relates to a method for coating piston rings ( 10 ) for internal combustion engines, wherein at least the bearing surface of the piston ring is provided with an anti-abrasion and anti-corrosion coating ( 12 ) by means of a PVD or electroplating process. According to said method, the anti-abrasion and anti-corrosion coating is prevented from flaking or cracking caused by strain occurring on the piston ring during the operation of the motor by means of the following steps: a) coating parameters are set; b) an uncoated piston ring ( 18 ) is pre-stressed in order to obtain a predetermined diameter ( 06 ) thereof or opening width ( 10 ); an ion coating process is carried out using coating parameters according to step a); the internal stress of the anti-abrasion or anti-corrosion coating ( 12 ) is measured in state (b); e) a new, uncoated piston ring ( 10 ) is subjected to tensile pre-stressing or compressive strain according to the measured internal tension of the coating; and f) the piston ring is coated ( 10 ) according to the coating parameters according to step a).
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