磁感应游离磨粒线锯切割中磁系设计研究

发布时间：2018-09-13 13:24

【摘要】：磁感应游离磨粒线锯切割技术通过在铁磁性锯丝外添加辅助匀强磁场,使锯丝磁化并产生高梯度磁场,锯丝周围的磁性磨粒受到磁力的作用,增加了进入切割区域的磨粒数量,从而改善了线锯切割进程。磁力作为影响锯丝周围磁性磨粒运动的重要作用力,其大小和方向主要受辅助匀强磁场影响,因此用来产生匀强磁场的磁系,在改善线锯切割进程中具有非常重要的作用。用来产生匀强磁场的磁系,既要提供较高的磁场强度又要满足切割中的实际要求。本文把磁路设计的原理,引入到磁感应游离磨粒线锯切割技术的磁系设计中,通过有限元仿真和实验设计了能与线锯切割机床组装且气隙可调的磁系结构,利用所设计的磁系进行了切割对比实验。(1)磁场强度是决定锯丝磁场梯度大小和磁性磨粒所受磁力大小的主要因素,为进一步分析磁场强度对切割性能的影响,把提高磁场强度作为磁系设计的首要要求。(2)把磁路设计原理引入到磁系设计中,通过有限元仿真和实验,设计了应用于磁感应游离磨粒线锯切割技术中的磁系结构,建立了磁系气隙距离与磁场强度的对应曲线。磁系气隙距离在50~90 mm变化时,可以调节的磁场强度为4.78×104~14.33×104 A/m。采用三维有限元仿真的方法,分析了置于磁系磁场中的锯丝的梯度磁场特性,进行了实验验证,置于磁系磁场中的锯丝对周围的磁性磨粒产生了明显的分区吸附效果。(3)搭建了磁感应线锯切割实验平台,利用所设计的磁系进行了切割对比实验。在10.35×104 A/m磁场强度下进行切割的工件具有最优的切缝宽度、崩边宽度、切割效率,磁场强度在0~10.35×104 A/m时工件切缝宽度、崩边宽度、切割效率随磁场强度的增加而逐渐改善。当磁场强度增大到14.33×104 A/m时,出现了随磁场强度的增大,切缝宽度和崩边宽度增加、切割效率降低的现象。适用于磁感应游离磨粒线锯切割技术中的磁场强度并不是越大越好,其范围为:7.16×104~14.33×104 A/m。
[Abstract]:Magnetic induction free abrasive wire saw technology by adding an auxiliary uniform magnetic field outside the ferromagnetic saw wire to magnetize the saw wire and produce a high gradient magnetic field, the magnetic abrasive particles around the saw wire are affected by magnetic force, thus increasing the number of abrasive particles entering the cutting area. Thus, the cutting process of wire saw is improved. Magnetic force is an important force affecting the movement of magnetic abrasive particles around saw wire. Its size and direction are mainly affected by the auxiliary uniform magnetic field, so the magnetic system used to produce uniform magnetic field plays a very important role in improving the cutting process of wire saw. The magnetic system used to produce uniform magnetic field should not only provide high magnetic field strength but also meet the practical requirements in cutting. In this paper, the principle of magnetic circuit design is introduced into the magnetic system design of magnetic induction free abrasive wire saw cutting technology. Through finite element simulation and experiment, the magnetic system structure which can be assembled with wire saw cutting machine and can be adjusted with air gap is designed. The experiments of cutting contrast are carried out with the designed magnetic system. (1) the magnetic field intensity is the main factor that determines the magnetic gradient of wire and the magnetic force of magnetic abrasive particles. In order to further analyze the effect of magnetic field intensity on cutting performance, The primary requirement of magnetic system design is to improve the magnetic field intensity. (2) the magnetic circuit design principle is introduced into the magnetic system design. Through finite element simulation and experiment, the magnetic system structure applied in the magnetic induction free abrasive wire saw cutting technology is designed. The corresponding curves between the air gap distance and the magnetic field intensity of the magnetic system are established. When the air gap distance of the magnetic system changes at 50 ~ 90 mm, the adjustable magnetic field intensity is 4.78 脳 10 ~ 4 ~ (4) N ~ (14.33) 脳 10 ~ (4) A / m ~ (-1). The gradient magnetic field of the saw wire placed in the magnetic field of the magnetic system is analyzed by using the three-dimensional finite element simulation method, and the experimental results are verified. The saw wire placed in the magnetic field of magnetic system has obvious effect of zonal adsorption on the magnetic abrasive particles around. (3) the experimental platform of magnetic induction wire saw cutting is built and the cutting contrast experiment is carried out by using the magnetic system designed. The workpiece cutting at 10.35 脳 10 ~ 4 A / m magnetic field intensity has the optimum cutting slot width, flanging width, cutting efficiency, and when the magnetic field intensity is 0 ~ 10.35 脳 10 ~ 4 A / m, the cutting seam width, flanging width and cutting efficiency will be improved gradually with the increase of magnetic field intensity. When the magnetic field intensity is increased to 14.33 脳 10 ~ 4 A / m, the cutting efficiency decreases with the increase of the magnetic field intensity, the width of cutting slit and the width of caving edge. The magnetic field intensity applied to the magnetic induction free abrasive wire saw is not as large as possible, and its range is: 7.16 脳 10 ~ 4 ~ (4) ~ 14.33 脳 10 ~ (4) A / m ~ (-1).
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ127.2;TG717

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