| Magnetic honing technology is a machining method based on electromagnetism and combining magnetic technology with honing technology,which can effectively reduce the roughness of the inner surface of stainless steel pipe and improve the surface quality.The special processing team of Taiyuan University of Technology has carried out relevant research on this technology and achieved certain results,such as magnetic circuit and circuit analysis of magnetic honing system,and discussed the importance of magnetic circuit design of magnetic honing head.The main processing parameters are analyzed and tested,which provides reference for the selection of magnetic honing processing parameters.The steel based CBN honing stick has been developed to improve honing efficiency.A water cooling circulation system was developed to solve the problems of large heat generation and poor heat dissipation effect of the magnetic honing system.Previous research and experiments show that the roughness value of the inner surface of stainless steel pipe can be reduced from 1.6?m to less than0.2?m after honing.However,it was found in the processing test that the magnetic honing system generates a large amount of heat,and the existing water-cooled circulation system has a complicated structure,high manufacturing cost,complicated operation and hidden danger of water leakage.In view of the above problems,the following research is carried out on the magnetic honing system:(1)The loss characteristics of the magnetic honing system are analyzed and calculated.According to the electromagnetic field theory,combined with finite element analysis,the copper loss,iron loss and friction loss are analyzed and calculated respectively.(2)Based on the magnetic honing system used in the test,a three-dimensional simulation model is established.The temperature field of the magnetic honing system is simulated in Ansys Workbench transient thermal simulation analysis module,and the temperature rise distribution and temperature rise variation curve of the magnetic honing system are obtained.(3)Combined with the knowledge of computer fluid mechanics and the simulation analysis software Fluent,the overall design of magnetic honing air cooling system is carried out.The flow field in the draft tube is numerically simulated,and the cross-sectional shape of the main tube,the number of air outlets and the diameter of air inlets and outlets are analyzed and optimized,and the draft plate is added.The simulation results show that the heat dissipation capability of the air cooling system meets the design expectation.(4)Based on the existing platform,an external air cooling system is built according to the previous design.A magnetic honing processing test was designed and carried out.The temperature rise characteristics of the magnetic honing system,the cooling efficiency of different cooling systems and the actual processing effect under different working conditions were compared with each other to comb and analyze the test results.The results show that the maximum temperature when the magnetic honing system reaches the steady state is 59.1?and the time to reach the steady state is shortened to 1.8h after the air cooling system is added.The error with the simulation result is within a reasonable range,which solves the problem of large calorific value of the magnetic honing system.When there is an air cooling system,the surface roughness is reduced by0.027?m,the processing effect is good,and the problem of complex structure,high manufacturing cost and complicated operation of water cooling system is solved.The air cooling system is a safe and effective cooling method for realizing the thermal stability of the magnetic honing system. |
PDF Full Text Request