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本文论述了磁场对放电间隙排屑的试验结果。当加工铁磁性材料时,有两种磁场情况影响了放电间隙: 1)垂直于放电间隙的磁场,其结果使间隙增大; 2)与放电间隙平行的磁场分量沿间隙的出口方向逐渐增大,其结果使被蚀除下的微粒得以加速流动。采用10毫焦耳以上的放电能量对钢工件所作的试验表明,当具有磁场时即使不冲油也能进行大面积或深孔加工。上述两种磁场情况都能使放电间隙内的排屑得以改善,但是与放电间隙平行的磁场分量有一优点,就是在排屑得到同样地改善情况下,则只要采用较小的磁场强度即可。这与靠增大间隙来改善其排屑相比,就可减小对加工精度的影响。
This article discusses the magnetic field on the discharge gap chip test results. When processing ferromagnetic materials, there are two magnetic field conditions that affect the discharge gap: 1) the magnetic field perpendicular to the discharge gap, which results in an increased gap; 2) the magnetic field component parallel to the discharge gap increases gradually along the exit of the gap As a result, the eroded particles are accelerated to flow. Tests on steel workpieces using a discharge energy of 10 millijoules or more indicate that large-area or deep-hole machining can be performed without oiling when a magnetic field is present. Both types of magnetic fields allow for improved chip discharge in the discharge gap. However, there is an advantage in the magnetic field component parallel to the discharge gap that the smaller magnetic field strength be used when the chip evacuation is similarly improved. This is by increasing the gap to improve its chip compared to the processing accuracy can be reduced.