【摘要】：磁感應(yīng)游離磨粒線鋸切割技術(shù)通過在鐵磁性鋸絲外添加輔助勻強磁場,使鋸絲磁化并產(chǎn)生高梯度磁場,鋸絲周圍的磁性磨粒受到磁力的作用,增加了進入切割區(qū)域的磨粒數(shù)量,從而改善了線鋸切割進程。磁力作為影響鋸絲周圍磁性磨粒運動的重要作用力,其大小和方向主要受輔助勻強磁場影響,因此用來產(chǎn)生勻強磁場的磁系,在改善線鋸切割進程中具有非常重要的作用。用來產(chǎn)生勻強磁場的磁系,既要提供較高的磁場強度又要滿足切割中的實際要求。本文把磁路設(shè)計的原理,引入到磁感應(yīng)游離磨粒線鋸切割技術(shù)的磁系設(shè)計中,通過有限元仿真和實驗設(shè)計了能與線鋸切割機床組裝且氣隙可調(diào)的磁系結(jié)構(gòu),利用所設(shè)計的磁系進行了切割對比實驗。(1)磁場強度是決定鋸絲磁場梯度大小和磁性磨粒所受磁力大小的主要因素,為進一步分析磁場強度對切割性能的影響,把提高磁場強度作為磁系設(shè)計的首要要求。(2)把磁路設(shè)計原理引入到磁系設(shè)計中,通過有限元仿真和實驗,設(shè)計了應(yīng)用于磁感應(yīng)游離磨粒線鋸切割技術(shù)中的磁系結(jié)構(gòu),建立了磁系氣隙距離與磁場強度的對應(yīng)曲線。磁系氣隙距離在50~90 mm變化時,可以調(diào)節(jié)的磁場強度為4.78×104~14.33×104 A/m。采用三維有限元仿真的方法,分析了置于磁系磁場中的鋸絲的梯度磁場特性,進行了實驗驗證,置于磁系磁場中的鋸絲對周圍的磁性磨粒產(chǎn)生了明顯的分區(qū)吸附效果。(3)搭建了磁感應(yīng)線鋸切割實驗平臺,利用所設(shè)計的磁系進行了切割對比實驗。在10.35×104 A/m磁場強度下進行切割的工件具有最優(yōu)的切縫寬度、崩邊寬度、切割效率,磁場強度在0~10.35×104 A/m時工件切縫寬度、崩邊寬度、切割效率隨磁場強度的增加而逐漸改善。當(dāng)磁場強度增大到14.33×104 A/m時,出現(xiàn)了隨磁場強度的增大,切縫寬度和崩邊寬度增加、切割效率降低的現(xiàn)象。適用于磁感應(yīng)游離磨粒線鋸切割技術(shù)中的磁場強度并不是越大越好,其范圍為: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).
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ127.2;TG717

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