共查询到20条相似文献,搜索用时 93 毫秒
1.
DK9032电熔爆数控机床的电磁干扰及其防护 总被引:1,自引:0,他引:1
符永宏 《机械科学与技术(江苏)》1997,26(4):37-41
介绍电熔爆加工新技术的原理,对电熔爆机床工作时所产生的电磁干扰进行了分析,并在计算,测量,分析的基础上,提出了防护的措施,即用电磁屏蔽罩体来控制电磁辐射,最后通过现场实测,验证了电磁屏蔽罩体的屏蔽效能。 相似文献
2.
3.
4.
彩色电视机荧光屏的内磁屏蔽罩,是彩色显像管屏蔽地磁吸力,保证光速射线直线投射到荧光屏面上的主要零件.屏蔽罩是低碳纯铁皮,其厚度仅为0.1mm.屏蔽罩是拉深压制成形的罩件,其尺寸大端为383×283、小端为236×180,高度102mm 的长方形弧锥台体罩件.目前我们国内生产彩色显像管的内磁屏蔽罩均是从国外进口.进口内磁屏蔽罩零件,包装要求高,运输周期长,还受到外商的约束.我们于90年底,以进口样品,根据我们现 相似文献
5.
EMC检测中的电磁屏蔽问题研究 总被引:1,自引:0,他引:1
主要研究屏蔽对电磁骚扰的抑制作用,分析了在EMC检测中的主要屏蔽问题,同时也分析了屏蔽体结构、屏蔽材料及衬垫的作用,重在解决EMC检测中的屏蔽问题。 相似文献
6.
7.
《机械制造与自动化》1996,(6)
今年7月美国原子能委员会将200公斤极难加工的特殊不锈钢空运到乌鲁木齐,要求新疆电熔爆技术研究所试验加工,按常规,机械加工需2小时,而这个所仅用一分钟就完成了加工任务,生产效率比传统机械加工高上百倍。这是新疆电熔爆技术研究所运用电熔爆技术加工金属材料取得的重大突破。电熔爆技术研究及设备研制通过国家项目验收。 相似文献
8.
9.
10.
11.
12.
13.
14.
与铝合金材料相比,镁合金材料具有质量轻、环保性能好和电磁屏蔽性能好等多方面的优点;因此,逐步被定位成新型的铁道车辆应用材料,其在铁道车辆上的应用已得到有关部门的重视。本文在结合镁合金特点的基础上,分析了其在铁路车辆上的适用情况与当前主要存在的问题,并对镁合金材料在现代铁道车辆上的应用前景进行了展望,提出了具有建设性意义的建议。 相似文献
15.
Gyanendra Kumar Singh Vinod Yadava Raghuvir Kumar 《International Journal of Precision Engineering and Manufacturing》2010,11(4):509-518
Electro-discharge machining (EDM) characteristics of tungsten carbide-cobalt composite are accompanied by a number of problems
such as the presence of resolidified layer, large tool wear rate and thermal cracks. Use of combination of conventional grinding
and EDM (a new hybrid feature) has potential to overcome these problems. This article presents the face grinding of tungsten
carbide-cobalt composite (WC-Co) with electrical spark discharge incorporated within face of wheel and flat surface of cylindrical
workpiece. A face grinding setup for electro- discharge diamond grinding (EDDG) process is developed. The effect of input
parameters such as wheel speed, current, pulse on-time and duty factor on output parameters such as material removal rate
(MRR), wheel wear rate (WWR) and average surface roughness (ASR), are investigated. The present study shows that MRR increases
with increase in current and wheel speed while it decreases with increase in pulse on-time for higher pulse on-time (above
100 μs). The most significant factor has been found as wheel speed affecting the robustness of electro- discharge diamond
face grinding (EDDFG) process. 相似文献
16.
Electrochemical machining (ECM) has been widely used in the aerospace, automotive, defense and medical industries for its many advantages over traditional machining methods. However, the machining accuracy in ECM is to a great extent limited by the stray corrosion of the unwanted material removal. Many attempts have been made to improve the ECM accuracy, such as the use of a pulse power, passivating electrolytes and auxiliary electrodes. However, they are sometimes insufficient for the reduction of the stray removal and have their limitations in many cases. To solve the stray corrosion problem in CRECM, insulating and conductive coatings are respectively used. The different implement processes of the two kinds of coatings are introduced. The effects of the two kinds of shielding coatings on the anode shaping process are investigated. Numerical simulations and experiments are conducted for the comparison of the two coatings. The simulation and experimental results show that both the two kinds of coatings are valid for the reduction of stray corrosion on the top surface of the convex structure. However, for insulating coating, the convex sidewall becomes concave when the height of the convex structure is over 1.26 mm. In addition, it is easy to peel off by the high-speed electrolyte. In contrast, the conductive coating has a strong adhesion, and can be well reserved during the whole machining process. The convex structure fabricated by using a conductive iron coating layer presents a favorable sidewall profile. It is concluded that the conductive coating is more effective for the improvement of the machining quality in CRECM. The proposed shielding coatings can also be employed to reduce the stray corrosion in other schemes of ECM. 相似文献
17.
为对电火花线切割加工机理有更深刻的认识,了解加工参数对加工精度的影响规律,介绍了一个电火花线切割加工粗加工的仿真系统。仿真系统通过对放电点的探索、工件的去除以及对线电极丝振动的分析,将实际的加工现象形象地再现于计算机上。为证实仿真系统的正确性,将仿真结果与试验结果进行了比较。在试验结果的获取中,为能够得到很难测量的线电极周围的放电间隙和工件形状数据,提出一种新的三维形状测量方法。通过对仿真结果和试验结果的比较,定性地证明了仿真方法的正确性。研究结果表明:改变线电极张力及伺服电压值时,从仿真过程得到的加工形状结果与试验得到的加工形状结果其倾向基本一致;加工缝端部的形状呈凸形还是呈凹形,取决于加工过程中放电爆发力和静电引力的相对大小。 相似文献
18.
A. V. Krokhalev O. A. Avdeyuk K. V. Prikhod’kov A. N. Savkin S. V. Kuz’min V. I. Lysak 《Russian Engineering Research》2014,34(2):85-88
Attention focuses on the application of powder coatings and the shaping of hard alloys from powder mixtures (chromium carbide + metals) in explosive machining. The loading conditions are investigated as a function of the properties of the metal binder, as well as its structure, hardness, and antifrictional behavior. 相似文献
19.