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There are several basic methods of mechanical seal grinding.The commonly used grinding methods for mechanical seals are divided into two types: dry grinding and wet grinding. During wet grinding, the workpiece is completely covered by the abrasive and is in a fully wet state; during dry grinding, the workpiece and the plate are in a dry state, and only a small amount of abrasive is used for grinding. Generally, wet grinding is used to achieve the required flatness, and then dry grinding is used to polish to achieve a beautiful and bright surface.
The operation method is as follows:
①Apply a little grinding liquid on the plate, and press the processing surface of the softer ring of the mechanical seal to the plate with your hands. You can add a little grinding liquid (clean water, kerosene, alcohol, etc.) and White corundum. Then you should continuously do triangular motion or reciprocating motion, under the pretext that its grinding motion should cover the entire surface of the flat plate until the required flatness is achieved. Keep in mind that a particle size of W14-W40 of the abrasive should be adopted for preliminary grinding of the softer sealing rings, W14-W7 for semi-finishing, and W5-W1 for finishing.
②Clean the softer ring of the mechanical seal and the flat plate, apply a little alcohol on the flat plate and repeat the above grinding motion. When the grinding liquid of the sealing softer ring is in a semi-dry state, the required mirror surface can be obtained. After removing the softer ring, rub it with white cotton yarn to make it brighter. During grinding, the abrasive should not accumulate, and the grinding liquid should not be too much. In the second step of dry grinding and polishing, the abrasive liquid should be less. You should be gentle or there will be marks.
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③Manual grinding and polishing of the harder ring of the mechanical seal. During the initial grinding, boron carbide abrasive paste was used and diluted with kerosene, and coated on the surface of the harder ring. Add a little light kerosene and boron carbon into the ring when the processing surface of the harder ring of the mechanical seal is placed on the plate,During grinding，the auxiliary friction ring of the mechanical seal should be moved back and forth according to triangle or 8-shaped movement law, and every corner of the grinding plate should be covered by grinding motions.
④When there is no processing traces can be seen after continuous grinding,the lapping（finishing=refined grinding） process can be started. Lapping is carried out on a lapping flat plate, and diamond paste with a particle size of W5-W1 is used for lapping.Then do triangular motion or reciprocating motion continuously on the plate and the movement should spreads all over the entire surface of the plate until the required flatness is reached. Wipe the harder ring of the mechanical seal and the flat plate before applying a little light kerosene, (note: no diamond paste) and repeat the above grinding until the harder ring of the seal is half dry to get the required flatness. After removing the harder ring, wipe the flat plate clean. Do not add any abrasive liquid or abrasive, and start dry grinding. Do not use too much force until it reaches the mirror surface, and then polish it with white cotton gauze.
⑤Key points for processing harder ring of the mechanical seal: the grinding force should not be too large, the force should be uniform, and partial grinding should be prevented. During grinding, the abrasive should not accumulate, and the grinding liquid should not be too much. The grinding speed should not be too fast, and during the second step of dry grinding and polishing there should be less abrasive liquid. The force should be uniform or there will be marks. (Note: The grinding plate must be clean or the polishing effect will not be good)
The operation method is as follows:
①Apply a little grinding liquid on the plate, and press the processing surface of the softer ring of the mechanical seal to the plate with your hands. You can add a little grinding liquid (clean water, kerosene, alcohol, etc.) and White corundum. Then you should continuously do triangular motion or reciprocating motion, under the pretext that its grinding motion should cover the entire surface of the flat plate until the required flatness is achieved. Keep in mind that a particle size of W14-W40 of the abrasive should be adopted for preliminary grinding of the softer sealing rings, W14-W7 for semi-finishing, and W5-W1 for finishing.
②Clean the softer ring of the mechanical seal and the flat plate, apply a little alcohol on the flat plate and repeat the above grinding motion. When the grinding liquid of the sealing softer ring is in a semi-dry state, the required mirror surface can be obtained. After removing the softer ring, rub it with white cotton yarn to make it brighter. During grinding, the abrasive should not accumulate, and the grinding liquid should not be too much. In the second step of dry grinding and polishing, the abrasive liquid should be less. You should be gentle or there will be marks.
③Manual grinding and polishing of the harder ring of the mechanical seal. During the initial grinding, boron carbide abrasive paste was used and diluted with kerosene, and coated on the surface of the harder ring. Add a little light kerosene and boron carbon into the ring when the processing surface of the harder ring of the mechanical seal is placed on the plate,During grinding，the auxiliary friction ring of the mechanical seal should be moved back and forth according to triangle or 8-shaped movement law, and every corner of the grinding plate should be covered by grinding motions.
④When there is no processing traces can be seen after continuous grinding,the lapping（finishing=refined grinding） process can be started. Lapping is carried out on a lapping flat plate, and diamond paste with a particle size of W5-W1 is used for lapping.Then do triangular motion or reciprocating motion continuously on the plate and the movement should spreads all over the entire surface of the plate until the required flatness is reached. Wipe the harder ring of the mechanical seal and the flat plate before applying a little light kerosene, (note: no diamond paste) and repeat the above grinding until the harder ring of the seal is half dry to get the required flatness. After removing the harder ring, wipe the flat plate clean. Do not add any abrasive liquid or abrasive, and start dry grinding. Do not use too much force until it reaches the mirror surface, and then polish it with white cotton gauze.
⑤Key points for processing harder ring of the mechanical seal: the grinding force should not be too large, the force should be uniform, and partial grinding should be prevented. During grinding, the abrasive should not accumulate, and the grinding liquid should not be too much. The grinding speed should not be too fast, and during the second step of dry grinding and polishing there should be less abrasive liquid. The force should be uniform or there will be marks. (Note: The grinding plate must be clean or the polishing effect will not be good)
