Patent ID: 7462374
Filing Date: 2008-12-09
Classification: B05C

Abstract:
1. A method of coating both head parts and a bridge part of a piston for a fixed displacement swash plate type compressor using a coating apparatus, said coating apparatus comprising: rotation support means for rotatably supporting both ends of the piston, a pair of first coating material applying means installed above the rotation support means in a manner such that said pair of first coating material applying means can be moved upward and downward, the pair of first coating material applying means having a pair of first nozzles that include a pair of first coating material spreading means, respectively, fixing means installed in the vicinity of the rotation support means for fixedly supporting both ends of the piston, and second coating material applying means installed above the fixing means in a manner such that said second coating material applying means can be moved upward and downward and slid laterally, the second coating material applying means having a second nozzle that includes second coating material spreading means, the method comprising the steps of: rotatably supporting both ends of the piston by the rotation support means; lowering the pair of first coating material applying means so that the respective first coating material spreading means are placed adjacent to both head parts of the piston; injecting coating material to the head parts of the piston through the first nozzles while rotating the piston by the rotation support means, and simultaneously spreading, by the first coating material spreading means, to a uniform film thickness the coating material applied to the head parts of the piston thereby removing excess coating material; fixedly supporting both ends of the piston by the fixing means; lowering the second coating material applying means so that the second coating material spreading means are placed adjacent to the bridge part of the piston; and injecting coating material to the bridge part of the piston through the second nozzle while sliding the second coating material applying means in an axial direction of the piston, and simultaneously spreading, by the second coating material spreading means, to a uniform film thickness the coating material applied to the bridge part of the piston thereby removing excess coating material; wherein a first viscosity of the coating material applied to the head parts is greater than a second viscosity of the coating material applied to the bridge part.