Device Design And Experimental Research On Rotor Abrader Of Magnetic Grinding On The Inner Surface Of Stainless Steel Pipes

Stainless steel pipes are being widely used in running pipelines and mechanical structure parts of oil industry, chemical industry, medical department, food industry, light industry, machinery and instruments industry and so on. In order to improve tensile strength under high temperature, weldability, corrosion resistance, machining easily and so on, the kind of large tubular parts should be processed under high temperature. Because stainless steel pipes are processed under high temperature, their surfaces have been formed a thick and solid oxide films. In addition,they are not easy to do high-speed rotation movement. Therefore, it is quite necessary to use the proper method to effectively remove oxide films and reduce the surface roughness value on the inner surface of tubings. What’s more, it is very significant to smooth the next working procedure, to prevent pipeline corrosion and extend service life of workpieces.At present, proper methods to effectively remove oxide films on the surface of stainless steel pipes have electrochemical machining, acid washing and so on. However, it is very difficult to install cathode and easy to cause short circuit when removing oxide films on the surface of stainless steel pipes use electrochemical machining. And pickling processed surfaces present the rugged black flakes. In addition, waste liquid could pollute environment. On the basis of simulation analysis of the finite element, a rotor abrader having strong magnetic permeability and grinding performance has been designed in this paper. And it could be rotated and moved axially on the inner surface of pipelines which are hard to be rotated at high-speed. Thus, it could effectively remove oxide films and reduce the surface roughness value on the surface of stainless steel pipes.In addition, it causes less pollution, has simple structure and operation and has a good application prospect.This paper focuses on the analysis of electromagnetic field of magnetic grinding system, the analysis of temperature field of magnetic grinding system, device design of rotor abrader, and the validation of processing effect of experiments. And the main contents are as follows:1. On the basis of electromechanics, the two-dimension transient electromagnetic field model of experimental device has been established and simulated based on Ansoft software. In this paper, the magnetic field lines distribution, the magnetic flux density distribution and the electromagnetic torque curve of the mould has been obtained. Then by comparing simulation result of electromagnetic torque based on finite element analysis with theoretical calculation of cutting torque, it is proved that the established system model is correct. Therefore, it could offer indispensable theoretical basis to parts desige of the rotor abrader.2. The two-dimension temperature field model of magnetic grinding system has been established and simulated based on ANSYS sofeware. According to simulation analysis of system model, it has found the continued working time and the main reason for the fever. Therefore, the conclusion could offer reference basis to ensure the magnetic grinding system not be burnt out, lengthen working time and improve processing efficiency.3. According to simulation results of electromagnetic field and temperature field of magnetic grinding system based on finite element softwares, a rotor abrader has been designed out which could be used for production experiments. Because the iron core of rotor abrader is composed of laminated silicon-steel sheets, it has reduced hysteresis loss and eddy-current loss in the course of processing. Thereby, temperature would be droped in the whole magnetic grinding system. The rotor abrader not only realize the automatic feed, but also play a good "flexibility" processing effect under the action of elasticity of compression springs. This paper puts oil-stone and oil-stone base fixed together by mechanical means, so it overcomes the traditional binding fixed shortcomings. Thus it is very convenient to install and remove the oil-stone. Moveover, the oil-stone base could be used multiple times and has not been deformation.4. According to processing experiments of the rotor abrader, it is proved that it could effectively remove oxide films and reduce the surface roughness value on the surface of stainless steel pipes. At the same time, this paper has set the appropriate axial feeding speed and revolving speed. Moveover, it has found the suitable oil-stone which could effectively remove oxide films and reduce the surface roughness value on the surface of stainless steel pipes. Thus, the couclution could provide necessary experimental datas and technical basis to improve the magnetic grinding system and optimize processing parameters.