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Mechanical Seal Repair and Grinding Mechanical Seals

by:Lepu Seal     2023-01-08

Repair and grinding of mechanical seals




2019-04-09 08:37





Abstract! The grinding process is a commonly used method in the repair process of mechanical seals. It is mainly divided into rough grinding, fine grinding and polishing.&Abrasives are essential in the grinding process&Points out the types of commonly used abrasives, and introduces the grinding methods of commonly used dynamic and static ring surface matching materials through typical grinding examples. The emergence of new materials, mechanical seal has become a mature sealing structure, because of its reliable sealing, less leakage, long service life, wide application range, etc., it is more and more widely used in various pumps) kettles and requirements Strict dynamic seal position&The main form of mechanical seal failure during use is that the end face of the dynamic and static rings is scratched, resulting in leakage&In order to reduce equipment operating costs $ Master mechanical seal repair technology---grinding process $ Make full use of the undamaged mechanical body in the mechanical seal element $ It is of great significance in practice The grinding mechanism uses abrasives and related tools $ Make the surface of the workpiece extremely thin The finishing method in which the layer becomes flat or smooth is called grinding&When grinding, put a high-hardness abrasive between the workpiece and the grinding disc&With the movement of the workpiece, the surface of the workpiece is squeezed by the abrasive, scratches and cracks, and because of the irregular movement of the abrasive in the abrasive and the rolling of the abrasive between the grinding disc and the surface of the workpiece, the broken pieces on the surface of the workpiece and the grinding pieces The blocks are pushed away by 1 and 2 so repeated that a smooth and precise plane is gradually formed&!G Abrasive Abrasive is a mixture of abrasive and water or oil&Abrasives can be divided into natural abrasives and artificial abrasives according to their sources&Natural abrasives include diamond, corundum, garnet, etc.&Artificial abrasives include artificial diamond, artificial corundum, silicon carbide, boron carbide, etc.& Diamond is carbon! Its crystalline Vickers hardness is the hardest substance in the world&Due to the high price of diamond, in the grinding process, the abrasive paste prepared from diamond powder with a particle size of micron is often used. It is mainly used for fine grinding and polishing of workpieces made of cemented carbide or ceramics.& Corundum alumina!,;!.="The crystal, natural corundum has greater toughness, the Vickers hardness is about !"""above& Silicon carbide! K9+"It is a thin plate crystal $Vickers hardness at =""" about&Due to internal impurities! The impurity content is generally less than =e"The existence of $ its appearance is often a variety of colors $ common are green and black&Silicon carbide has less toughness, green silicon carbide is more brittle than black silicon carbide, suitable for processing various brittle materials& Boron carbide! (H+"The hardness exceeds that of silicon carbide and is close to that of diamond. It is used for grinding workpieces with high hardness.& Synthetic diamond abrasive paste is prepared from synthetic diamond powder and other mixtures&The paste is water-soluble $ with ideal lubricity&Can be diluted with water and glycerin&The grinding paste produced by each manufacturer is matched with different colors according to different specifications, which is convenient for identification during use&= G Grinding process and influencing factors = 4 $ G Manual grinding process The workpiece) grinding disc must be thoroughly cleaned before grinding $ and pay attention to the cleanliness of the surrounding environment&It is advisable to use absorbent cotton or soft cotton yarn when cleaning and wiping&When grinding $ put the workpiece on the grinding disc $ add the adjusted abrasive and rotate evenly in the shape of 1% 2&When grinding, a certain pressure must be added to the workpiece. The grinding movement should be smooth and even.& Take the grinding of steel ring as an example, the grinding process is %!"Coarse grinding Abrasive%!%"l Boron carbide grinding paste#Workpiece pressure size%"4$Sb: left and right #Movement speed% About $ rotation per second 1% 2 words& Matters needing attention% The abrasive is diluted with kerosene and applied to the grinding surface of the workpiece and the surface of the rough grinding disc&Every part of the surface of the grinding disc should be ground to $ to make the grinding disc wear evenly&Wash the grinding disc and workpiece with gasoline for each grinding, replace with new abrasive, and continue grinding&Continuous grinding H"a#"A9E$ You can turn to lapping when you can't see the scratches on the ring surface& !!"Grinding Abrasive % each accounted for $d=volume_<type alumina) kerosene) ="lEmulsion made by adding a small amount of oleic acid) to the oil mixture
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