Method for coating piston rings for internal combustion engine

Details Method for coating piston rings for internal combustion engine Method for coating piston rings for internal combustion engine

2003-11-27

2008-03-11

Chen, Bret (Department: 1762)

Chemistry: electrical and wave energy

Processes and products

Coating, forming or etching by sputtering

C427S008000, C427S528000, C427S530000

Reexamination Certificate

active

07341648

ABSTRACT:
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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