Flame spraying process flow of valve seat sealing surface
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Release Time：2019-06-13
The preparation work before the valve spray welding, surface pretreatment, valve spray welding, valve spray welding after treatment. Preparation before spray welding of 1. valves: determination of spray welding materials, spray welding tools, spraying equipment and processes. 1. Determine the thickness of the coating. Generally speaking, the valve must be machined after spray welding, so the coating thickness should be reserved for machining allowance, and the thermal expansion and contraction of the valve during spray welding should also be taken into account. 2. Determination of coating material. The selection basis is that the coating material should meet the material, technical requirements and working conditions of the valve spray welding workpiece, and the material of the bonding layer and the working layer should be selected respectively. 3. Determine parameters: pressure, powder particle size
The preparation work before the valve spray welding, surface pretreatment, valve spray welding, valve spray welding after treatment.
Preparation before spray welding of 1. valve:
Determination of spray welding materials, spray welding tools, spraying equipment and processes.
1. Determine the thickness of the coating. Generally speaking, the valve must be machined after spray welding, so the coating thickness should be reserved for machining allowance, and the thermal expansion and contraction of the valve during spray welding should also be taken into account.
2. Determination of coating material. The selection basis is that the coating material should meet the material, technical requirements and working conditions of the valve spray welding workpiece, and the material of the bonding layer and the working layer should be selected respectively.
3. Determine the parameters: pressure, powder particle size, the relative movement speed of the spray gun and the workpiece.
2. valve workpiece surface pretreatment.
1, surface cleaning, remove oil, rust, paint, etc., so that the surface of the workpiece clean, no dirt, if the oil has penetrated into the substrate material, can be removed by flame heating, the rust layer can be acid leaching, mechanical polishing or sandblasting to remove.
2. The purpose of surface roughening is to enhance the bonding force between the coating and the substrate and eliminate the stress effect. Commonly used are sandblasting and slotting threads.
Spray welding of sealing surface of 3. valve
Spray welding working layer of valve: after the bonding layer is sprayed, the ash and oxide film shall be removed with a wire brush. Workpiece cooling after spray welding: when cooling, the main thing is to prevent the coating from cracking and deformation of the workpiece. Precautions should be taken especially for some special shapes.
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