Magnetic Abrasive Finishing Mechanism And Experimental Study For Nickel-based Superalloy

Magnetic Abrasive Finishing technology is the magnetic field and abrasive applied to the traditional grinding developed an advanced composite finishing technology, it is very effective to improve the surface quality of technical means in aviation aerospace, machinery, instruments, medical equipment, nuclear energy has broad application prospects. However, the lack of high-performance magnetic abrasive and finishing magnetic force mechanism of difficult materials no clear understanding, no special grinding equipment and optimized grinding process parameters and many other issues, restricted the development of the technology. To solve these problems, this paper used XK7136 C for the research platform, finishing its magnetic system transformation. Using atomized rapidly solidified prepared spherical composite magnetic abrasive for difficult materials finishing test analysis sphere finishing mechanism of the composite magnetic abrasive. Selection high-performance nickel-base wrought superalloy Inconel718(GH4169) and nickel-based superalloy K419 grinding test and parameter optimization. The main contents are as follows:1. Spherical magnetic abrasive finishing mechanismStress Analysis of start from spherical particles in a magnetic field, the polishing brush cutting and grinding pressure analysis. Obtained magnetic finishing is done joint action of mechanical, chemical and electrochemical. Focus on strong permanent magnetic field spherical composite magnetic abrasive magnetic material grinding theoretical model finishing process conditions, material microscopic removal mechanism and process parameters influence law of surface quality was found spherical composite magnetic abrasive static effective sharpening more, micro-edge distribution consistency and good characteristics, can effectively improve the processing efficiency to obtain high surface quality.2. Polishing line speed and processing performance abrasive brush DiscussionMagnetic abrasive brush polishing line cannot increase indefinitely, when the grinding brush with the spindle rotation speed too high magnetic grains will have a greater centrifugal force, if the magnetic field generated less than the binding force of grain being centrifugal force it will fly out of the processing region, resulting in reduced processability abrasive brush. Thus have maximum line speed of the grinding process of determining pole. Through theoretical analysis and derivation formula obtained can be used to increase the strength of the magnetic field strength and the magnetic field gradient within the working area, choose the relative permeability abrasive grit and other methods to reduce the occurrence of fly-processing region, obtained the relatively maximum line speed of atomized condensate spherical composite magnetic abrasive to improve grinding brush processing performance.3. Design and simulation of permanent magnet poleSelected XK7136 C for the research platform, finishing its magnetic system transformation, using a strong permanent magnet material Nd Fe B design and manufacture of high efficiency permanent magnet poles, combined with a rigid abrasive brush problem when finishing machining, proposed magnetic pole end the center portion of the material removal. This design can improve the strength of the magnetic field within the range of the magnetic pole end near the center and conducive the flow of the magnetic abrasive grains resolve rigidity strong impact finishing quality problems. Selection of ANSYS simulation magnetic field lines and strength distribution of the pole end with different shapes and sizes of slotted distribution simulation analysis to optimize the effectiveness of magnetic pole structure parameters obtained, by grinding test to verify the design of the poles.4. Nickel-based superalloy Inconel718 and K419 magnetic finishing testSelection used widely nickel-base superalloy Inconel718 and K419 in the aerospace field prepared by rapidly solidified spherical composite magnetic abrasive grinding comparison tests. It analyzes the magnetic field strength and the processing time is constant, spindle speed, the machining gap, the abrasive grain size and the amount of filling on the abrasive surface topography and roughness. Selection of orthogonal experiment to optimize the parameters for each grinding, machining of the two materials are summarized to give the best combination of grinding parameters and magnetically finishing experimental verification achieved good finishing effect. Mature development of magnetic finishing technology and promotion play a catalytic role in the practical application.