Research On Shaft Seal Design And Sealing Performance Of Electrolytic Machining Fixture

As a special processing method,electrolytic processing has very important value in manufacturing.Most of the electrolytic processing needs to be completed in the sealed processing chamber.At this time,the sealing of the processing cavity has a great influence on the precision of the workpiece processing.In this process,as the key part of the sealing,the shaft seal design of the electrolytic machining fixture is well designed.The badness also affects the sealing performance of the processing cavity to a large extent,and it is necessary to select and design a reasonable shaft sealing device for the electrolytic processing fixture and improve the sealing property.Based on the structural optimization theory,the size of the flanges of the important bearing components of the designed shaft sealing device was optimized,and the optimization effect was obvious;the contact analysis of packing rings of 3 different materials was carried out to simulate the contact stress of different packing rings;Compression simulation analysis of the packing ring is performed,and the process of packing ring being squeezed during the sealing process can be seen directly.Based on the Gaussian random distribution theory,the roughness of the working surface was constructed,and the surface roughness of the corresponding object was actually measured.The similarities and differences between the simulation and the actual measurement to obtain the rough surface were compared,and the simulation was verified to be correct.Leakage model,and the leakage of the leakage model is calculated through the parallel plane gap flow model.At the same time,a geometric model of the leakage channel is established for simulation.It is shown that the larger the rough height of the sealing surface,the larger the leakage amount;The longer,the smaller the leakage;the smaller the diameter of the seal ring and the shaft,the smaller the leakage.Through the sealing performance test of the designed shaft sealing device,the test verifies that the use of the metal gasket at the gasket seal can better avoid the blowout deformation;at the filler seal,the four shaft covers with different roughness are not The leakage test is carried out under pressure.The test shows that there is little difference in the leakage amount when the shaft rotates slowly and at rest.The leakage measured by the test has a certain deviation from the model’s estimated fine value,but both are in an order of magnitude,in line with the prediction.Principle and scope;respectively test the leakage of seals of 3 different materials under different gland pressure conditions,and verify the influence of gland pressure on the sealing performance.