Thermal Spraying Coating Is A Surface Engineering Technology That Uses Heat Sources Such As Electric Arcs, Plasma Arcs Or Combustion Flames To Heat Materials Such As Powders And Wires To A Molten Or Plastic State, Accelerates The Atomized Particles Through Compressed Air Or Flame Flow, And Uses High-Speed Airflow To Atomize And Spray Them Onto The Surface Of The Substrate To Form A Coating With Specific Functions;
Common Thermal Spraying Processes Include: Flame Spraying, Oxyacetylene Flame Powder Spraying, Oxyacetylene Flame Wire Spraying, Oxyacetylene Flame Welding, High Velocity Oxygen Fuel Spraying (HVOF), Arc Spraying, Plasma Spraying, Atmospheric Plasma Spraying, And Low Pressure Plasma Spraying,HVAF.
The Thermal Spray Coating Grinding Process Is To Finely Process The Sprayed Surface By Mechanical Means To Remove The Rough Surface Layer And Optimize The Dimensional Accuracy.
*Example:
In Papermaking Equipment Maintenance, Thermal Spraying Is Often Used To Repair Worn Drying Cylinder Surfaces. For Example, After Using Supersonic Spraying Technology To Form An Anti-Corrosion And Wear-Resistant Coating, It Is Necessary To Increase The Surface Roughness From Ra0.01 To Ra0.8 Through Grinding To Meet The Precision Requirements Of Paper Production.
When Grinding Thermal Spraying, It Is Generally Divided Into Several Methods Such As External Cylindrical Grinding, Internal Cylindrical Grinding, Surface Grinding And Polishing. The Most Commonly Used Are Diamond Grinding Wheels And Diamond Belts;
Two Types Of Grinding Wheels Are Often Used In Grinding. One Is 1A1 Resin Diamond/Cbn Grinding Wheel For Grinding Thermal Spray Coatings, And The Other Is 14A1 Resin Diamond/Cbn Grinding Wheel For Grinding Thermal Spray Coatings. Both Grinding Wheels Can Be Customized In Sizes Ranging From 50mm To 1100mm.There Are Also Ceramic-Bonded Diamond Grinding Wheels For Grinding Thermal Spray Coatings, Generally Used On Metal Coatings;
The Force On The Grinding Wheel Has A Great Influence On The Surface Roughness And Grinding Efficiency. Coarse Abrasives Lead To Large Grinding Depth And High Productivity, But The Surface Roughness Value Is Large. On The Contrary, Uniform Grinding Depth Leads To Small Surface Roughness Value. Therefore, Coarse Grain Size Is Generally Used For Rough Grinding, And Fine Grain Size Is Used For Fine Grinding. When Grinding Soft Metals, Use Coarse Abrasives, And When Grinding Brittle And Hard Materials, Use Fine Abrasives.
*When Grinding The Coating, It Should Be Noted That There Is A Big Difference Between Forgings And Castings Of The Same Material. Excessive Grinding Pressure Will Cause The Transfer Or Movement Of Particles On The Coating Surface, And Even Cause Cracks In The Coating. Due To The Poor Thermal Conductivity Of The Coating, Sufficient Cooling Medium Should Be Provided During Grinding.
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