双磁盘磁力钝化参数对刀具刃口的影响

The Influence of Double Disk Magnetic Passivation Parameters on Cutting Edge

刀具钝化技术对提高刀具寿命具有重要的作用,为了探究双磁盘磁力钝化对刀具刃口的影响,首先分析了双磁盘磁力钝化的基本原理及磁性磨粒的材料去除机制;其次采用了Ansys maxwell仿真软件对硬质合金刀具在不同磁盘间距,不同磁盘厚度下的磁感应强度、磁力线分布进行了有限元分析,发现了磁盘间距、磁盘厚度对刀具轴向和端面磁感应强度及钝化压力的变化规律;最后通过试验法对不同钝化时间下刀具刃口的变化进行了探究,并基于B样条曲线对刀具刃口进行了绘制。最终得出了在磁盘伸入量为15~35 mm时,磁性磨粒对刀具的钝化压力最大,且为了保证刀具刃口的非对称性,磁盘间距应保持在12~18 mm之间,同时,在对平头类刀具进行钝化加工的时候,磁盘间距应保持在18~30 mm之间,考虑到成本和时间效益的影响,磁盘厚度不宜超过120 mm、钝化时间不宜超过10 min。

Tool passivation technology plays an important role in improving tool life.In order to explore the impact of dual-disk magnetic passivation on the cutting edge of the tool,the basic principle of dual-disk magnetic passivation and the material removal mechanism of magnetic abrasive particles are first analyzed.The Ansys maxwell simulation software was used to perform finite element analysis on the magnetic induction intensity and magnetic field line distribution of the cemented carbide tool at different disk spacing and different disk thickness.It was found that the disk spacing and disk thickness have an effect on the axial and end magnetic induction intensity and passivation pressure of the tool.At last,the change of the cutting edge of the tool under different passivation time was explored through the experimental method,and the cutting edge of the tool was drawn based on the B-spline curve drawing.Finally,it is concluded that the magnetic abrasive particles have the highest passivation pressure on the tool when the disk extension is 15~35 mm,and in order to ensure the asymmetry of the cutting edge of the tool,the disk spacing should be kept between 12~18 mm.At the same time,When passivating flat-head tools,the disk spacing should be kept between 18~30 mm.Considering the cost and time efficiency,the thickness of the disk should not exceed 120 mm and the passivation time should not exceed 10 min.