Ultra-low temperature nitridation method for engine cylinder liner of large-scale watercraft
A technology of engine cylinder and low-temperature nitriding, which is applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of rising use cost, affecting the manufacturing accuracy and installation accuracy of workpieces, and seriously polluting the environment. Improve the service life and safety, eliminate pits and pits, and reduce the cost of use
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example 1
[0025] Example 1: Process the cylinder liner according to the following steps:
[0026] (1) To remove oil, use a towel to wipe off the oil on the surface of the workpiece, the inner hole, the outer circle, etc., to prepare for chemical degreasing;
[0027] (2) Install the frame, put the workpiece into the fixture, and do not allow the workpiece to collide to avoid deformation;
[0028] (3) Chemical degreasing, put the workpiece together with the fixture into the degreaser pool for degreasing, the temperature is 75°C, 5 minutes, subject to cleaning;
[0029] (4) Cleaning, the workpiece is cleaned with running water in a clear water pool; the water film on the surface of the workpiece is evenly distributed, and no water drops are caught;
[0030] (5) Preheating, hoist the workpiece into the tempering furnace for preheating, the workpiece hoisted into the furnace should be placed upright, stable, and cannot be bumped to avoid deformation, the preheating temperature is 200°C, and...
example 2
[0037] Example 2: Treat the cylinder liner according to the following steps:
[0038] (1) To remove oil, use a towel to wipe off the oil on the surface of the workpiece, the inner hole, the outer circle, etc., to prepare for chemical degreasing;
[0039] (2) Install the frame, put the workpiece into the fixture, and do not allow the workpiece to collide to avoid deformation;
[0040] (3) Chemical degreasing, put the workpiece together with the fixture into the degreaser pool for degreasing, the temperature is 85°C, 6.5 minutes, subject to cleaning;
[0041] (4) Cleaning, the workpiece is cleaned with running water in a clear water pool; the water film on the surface of the workpiece is evenly distributed, and no water drops are caught;
[0042] (5) Preheating, hoist the workpiece into the tempering furnace for preheating, the workpiece hoisted into the furnace should be placed upright, stable, and cannot be bumped to avoid deformation, the preheating temperature is 225°C, and...
example 3
[0049] Example 3: Process the method according to the following steps:
[0050] (1) To remove oil, use a towel to wipe off the oil on the surface of the workpiece, the inner hole, the outer circle, etc., to prepare for chemical degreasing;
[0051] (2) Install the frame, put the workpiece into the fixture, and do not allow the workpiece to collide to avoid deformation;
[0052] (3) Chemical degreasing, put the workpiece together with the fixture into the degreaser pool for degreasing, the temperature is 95°C, 8 minutes, subject to cleaning;
[0053] (4) Cleaning, the workpiece is cleaned with running water in a clear water pool; the water film on the surface of the workpiece is evenly distributed, and no water drops are caught;
[0054] (5) Preheating, hoist the workpiece into the tempering furnace for preheating, the workpiece hoisted into the furnace should be placed upright, stable, and cannot be bumped to avoid deformation, the preheating temperature is 250°C, and the tim...
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