A Mechanism Research On Pulse Powder Compaction Of Collector Magnetic

Powder metallurgy products have been widely used in many fields such as people’sproduction and life owing to its unique properties. As a new powder metallurgy, electro-magnetic compaction of metal powder owns a lot of advantages such as high energy, non-pollution, low cost, high efficiency, and excellent performance. The technique of electro-magnetic compaction of metal powder involves electro-magnetic field, temperature field,structure field and other physical fields. The parameters of the electro-magnetic compactionof metal powder are numerous and complex, and it is hard to finish the research oncompaction only through experimental test. Aiming at the shortcomings of the electro-magnetic compaction of metal powder, this thesis builds the corresponding circuit and electro-magnetic analysis models to study the influences of various parameters in collector magneticon the driver board by the secondary development of ANSYS finite. The thesis designs thematched collector magnetic with the electro-magnetic compaction of metal powder in order tocontrol the magnetic field distribution and optimize the current organization of the electro-magnetic compaction of metal powder.The thesis builds double-loop circuit model, writes ANSYS command stream and createsa shortcut in consideration of the influence of workpiece on the system on the basis of theanalysis of LRC circuit. Moreover, the thesis investigates the influences of inductance,damping ratio and capacitance on the powder compaction by using double-loop circuit model.During the compaction process of workpiece, the workpiece has little impact on the system.The decreases of inductance and resistance increase the magnitude of current to a large scale,and finally prove that the increase of voltage is the most effective way.In view of the electro-magnetic analysis, the thesis builds2D,3D electro-magnetic pulsemodel on the basis of collector magnetic. The influences of the height H of collector magnetic,the upper and lower radius R1and R2, power frequency f, skin depth and gap D on collectormagnetic are all examined. The increase of the height H of collector magnetic would depletethe electro-magnetic energy of the whole system. The confirmation of H is related to thedischarge frequency f and skin depth. The higher the power frequency f is, the better energytransferring effect of collector magnetic will be. The bigger the gap D is, the more uneven the force of drive board will be. And the confirmation of D subjects to the current flashovers air.The bigger the aperture angle β is, the lower efficiency of the collector magnetic will be. Thetransferring effect would be best when β=45°.The thesis probes into the mechanism of the densification of electro-magnetic powder athigh speed by utilizing MSC.MARC, and further draws a conclusion that the densification ofpowder is mainly because the large deformation, heat and hot melting render theconsolidation of powder particles in a short time of adiabatic air. Still, the thesis optimizes thestructure of the powder compaction by using collector magnetic, puts forward two structuralprojects, curtails and eliminates the tapered amplifier and finally makes the compaction speedtriple and33times the previous compaction speed.