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Valve sealing surface grinding the basic principle
Grinding, the valve manufacturing process is commonly used in the sealing surface of a finishing method. Grinding can make the valve sealing surface to obtain high dimensional accuracy, geometry and surface roughness roughness, but can not improve the sealing surface between the mutual accuracy of the position. After grinding the valve sealing surface usually can reach the dimensional accuracy of 0.001 ~ 0.003mm; geometric precision (such as roughness) is 0.001mm; surface roughness of 0.1 ~ 0.008. Sealing surface grinding basic principles include the grinding process, grinding movement, grinding speed, grinding pressure and grinding allowance five aspects. Grinding process and sealing ring surface with a good towel together, research tools along the surface for complex lapping movement. Grinding agent is placed between the research tool and the surface of the seal ring. When the surface of the research tool and the seal ring is relatively moved, part of the abrasive particles in the grinding agent slides or rolls between the research tool and the surface of the seal ring, and the surface of the seal ring is cut thin A layer of metal. The convex peaks on the seal surface are first ground off and then gradually reach the required geometry. Abrasive grinding is not only the mechanical processing of the metal, but also chemical. Abrasive oil can make the surface to be formed oxide film, thus accelerating the grinding process. Grinding R & D and sealing ring surface relative movement, the surface of the ring on each point on the R & D tool relative sliding path and should be the same. And, the direction of relative motion should be constantly changing. Changing the direction of movement so that each abrasive particles will not repeat their trajectory in the seal surface, so as to avoid significant wear marks and increase the surface roughness of the seal. In addition, the movement direction of the broken change can not make the abrasive is distributed more evenly, so as to cut the metal surface of the seal more evenly. Despite the complexity of the grinding movement, despite the large changes in the direction of movement, the grinding movement is always carried out along the lap surface of the lap and seal. Whether it is manual grinding or mechanical grinding, the geometric precision of the seal surface is mainly affected by the accuracy of the grinding tool geometry and grinding movement. Grinding speed Grinding the faster, the higher the efficiency of grinding. Grinding speed, the workpiece surface in the unit of time through the abrasive more, cut off the metal is also more. Grinding speed is usually 10 ~ 240m / min. Grinding high precision workpiece, grinding speed generally not more than 30m / min. The sealing speed of the sealing surface of the valve is related to the material of the sealing surface, the grinding speed of the sealing surface of the copper and the cast iron is 10 to 45 m / min, the sealing surface of the hardened steel and the hard alloy is 25 to 80 m / min, the sealing surface of the austenitic stainless steel For 10 ~ 25m / min. Grinding pressure grinding efficiency increases with the grinding pressure increases, the grinding pressure can not be too large, usually 0.01 ~ 0.4MPa. Grinding iron, copper and austenitic stainless steel sealing surface, the grinding pressure of 0.1 ~ 0.3MPa; hardened steel and carbide sealing surface of 0.15 ~ 0.4MPa. Rough study when taking a larger value, lapping when taking smaller values. Grinding margin grinding is finishing process, so the amount of cut is small. Grinding margin depends on the size of the processing accuracy and surface roughness. Under the premise of guaranteeing the removal of the machining marks on the previous process and the correction of the geometrical error of the seal ring, the smaller the grinding allowance, the better. Sealing surface should generally be ground before grinding. After grinding the sealing surface can be directly refined, the minimum grinding margin: diameter margin of 0.008 ~ 0.020mm; plane margin of 0.006 ~ 0.015mm. Take a small value when manual grinding or material hardness is high, take a large value when mechanical grinding or material hardness is low. Valve sealing surface is difficult to grinding, can be fine car. Fine car after the sealing surface to be rough after roughing, the plane margin of 0.012 ~ 0.050mm.