Porous mechanical seal processing methods Analysis

Mechanical seal mechanical security seals structure of porous structure. Ring seal ring is flat, flat end face of the stationary ring arranged with uniform pores rules to form a porous face. Microporous round hole, oval hole or tapered bore.
Diameter from a few microns to hundreds of microns, hole depth from a few microns to tens of microns, porosity (pore area percentage of the total face area) from 5% to 30%.indicative seals The surface roughness of the porous end with the same stationary ring surface roughness, Ra are 0.01 ~ 0.02μm.
Porous mechanical seal processing methods
Cover depth micron processing flow slots or pores, conventional machining methods are almost powerless. So people explored a variety of processing methods, mainly the following: photochemical etching process (photolithography), EDM (electric etching), electrochemical machining and laser processing method.
Compared to conventional processing techniques, laser processing for a wide range of different materials, different shapes are suitable for machined surfaces with no mechanical deformation of the workpiece, clean, fast, good repeatability and high degree of automation. Obviously, for the porous mechanical seal rings, the other processing methods are powerless, only the use of the laser processing method in order to obtain satisfactory results.
Friction performance test
End load with the seal ring, respectively, and the common seal ring laser processing porous comparison test, two kinds of seal ring face size, surface roughness, end load and speed, etc. are identical test conditions, carbon graphite material of the seal ring sealing ring paired with both tests run. Laser Surface mechanical seal mechanical seal friction coefficient than the average coefficient of friction is much lower. From the friction coefficient of view, high security bolt sealsordinary mechanical seal friction coefficient in boundary friction state, and laser processing porous mechanical seal friction coefficient in mixed and even liquid friction state, therefore, the laser processing of porous seal ring seal rings than ordinary has better friction properties.