关于制造电磁铁的线圈骨架隔磁环中骨架产生裂纹现象的研究

发布时间：2018-01-06 20:14

本文关键词：关于制造电磁铁的线圈骨架隔磁环中骨架产生裂纹现象的研究　出处：《长春工业大学》2012年硕士论文　论文类型：学位论文

【摘要】：液压控制系统现已被广泛地应用于航空航天等领域。在此系统中,一些性能较高的电磁阀被越来越多地应用于液压油路的控制中。本文所研究的CT50型电磁铁就是上述电磁控制阀的重要组成部分,与传统的电磁铁相比,不仅能够完成以往简单的闭合和开启动作,而且要求在频繁的开闭动作中迅速灵活,把延迟和振动现象的出现概率降到最低。CT50型电磁铁的线圈骨架中由于加入了隔磁环(隔磁环的主要作用是让磁路产生分路,防止磁回路短路),可以有效地避免延迟现象的出现。隔磁环使磁极上产生了两个不同时为零的脉动磁通。从而保证了磁力始终大于零,不会发生振动现象。线圈骨架的制作过程中加入隔磁环,使得工艺变得更为复杂,即由原来一种金属棒材经机械加工制成,变为现在的线圈骨架上下部过盈配合后进行钎焊,形成由黄铜熔焊而成的隔磁环,最后经过机械加工制成。但在实际生产加工中,由于在线圈骨架上下部的相关尺寸参数及过盈量选择不当,经过钎焊工序,机械加工成型后,经密封性试验和磁粉检测发现,线圈骨架的隔磁环下方会出现线形或点线形周向裂纹,并且这种现象是成批出现。使得制作该线圈骨架的成品率降低,相应地增加生产成本。在轴套过盈配合中,过盈量的选取直接影响着其接触面的Von Mises应力状态,过盈量越大,Von Mises应力越大的这种观点是不够准确的,其中还受轴套的外径及其他一些尺寸的影响。本文将针对线圈骨架上下部进行有限元建模,选取不同的尺寸参数及过盈量对其采用有限元接触分析,得出Von Mises应力最大值。并以此为基础安排正交试验,采用极差分析技术计算分析影响Von Mises应力最大值的主要因素,并得出最优尺寸参数,其并以此为试验验证和改善相关工艺作为理论依据。
[Abstract]:Hydraulic control system has been widely used in aerospace and other fields. Some high performance solenoid valves are more and more used in the control of hydraulic oil circuit. The CT50 electromagnet studied in this paper is an important part of the electromagnetic control valve, compared with the traditional electromagnet. Not only can complete the previous simple closing and opening actions, but also requires rapid flexibility in frequent opening and closing actions. The probability of delay and vibration phenomena is reduced to the lowest. CT50 type electromagnet coil skeleton due to the addition of magnetic isolation ring (the main role of the magnetic ring is to cause magnetic circuit separation to prevent magnetic circuit short circuit). The phenomenon of delay can be avoided effectively. Two pulsating fluxes with different zero are produced on the magnetic pole by the separated magnetic ring, which ensures that the magnetic force is always greater than zero and no vibration will occur. In the process of making the coil skeleton, the magnetic isolation ring is added, which makes the process more complicated, that is, the former metal bar is machined, and now the coil skeleton is brazed with the interference of the upper and lower parts of the coil skeleton. The magnetic ring formed by brass fusion welding was machined. But in the actual production, due to the improper selection of the relevant dimension parameters and interference amount in the upper and lower parts of the coil skeleton, the brazing process was carried out. After machining, through sealing test and magnetic particle testing, it is found that the circumferential crack of line or point line will appear under the isolated ring of the coil skeleton. And this phenomenon occurs in batches, which reduces the yield of the coil skeleton and increases the production cost accordingly. In the interference fit of the shaft sleeve, the selection of the interference quantity directly affects the Von Mises stress state of the contact surface, and the greater the interference amount is. The view that the greater the stress of Von Mises is not accurate, is also affected by the outer diameter of the shaft sleeve and some other dimensions. In this paper, the upper and lower parts of the coil skeleton are modeled by finite element method. The maximum stress of Von Mises is obtained by using finite element contact analysis with different dimension parameters and interference. The orthogonal test is arranged on this basis. The main factors affecting the maximum stress of Von Mises are calculated and analyzed by using the range analysis technique, and the optimum dimension parameters are obtained, which is used as the theoretical basis for the experimental verification and improvement of the related technology.
【学位授予单位】：长春工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH137.52

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