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大型离心铸造机的控制系统设计 总被引:1,自引:0,他引:1
大型离心铸造机大多用来生产轧辊.在离心铸造中,铸型(也称管模)的转速非常重要,尤其在轧辊生产中,需要二次浇注(添芯),特别要求转速与时间及温度的严格控制.为满足轧辊的铸造工艺要求,我们为大型离心铸造机设计了控制系统,该系统实时控制且动态跟踪,精确控制离心铸造轧辊的工艺过程. 相似文献
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一台现代化的5机架串联式铝板冷轧机,装配有润滑、冷却和液压多种系统。本文介绍了当使用以冷却轧辊的轧制油为基的合成润滑剂时,轴承润滑系统和液压系统能够可靠地工作。本方法完全避免了由于矿物油漏泄而造成的板材污斑。 相似文献
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本文介绍的轧辊及接轴液压平衡系统,工作时轧辊及接轴同一个稳定的油源压力平衡;换辊时轧辊及接轴由两个油源压力分别平衡。经过生产实践,接轴运转平稳,换辊方便,工作可靠,满足轧制工艺要求。 相似文献
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塑料中空吹塑机液压系统的设计与研究 总被引:1,自引:1,他引:0
通过分析大型中空成型工艺流程,对塑料中空成型机液压控制系统进行了设计,并对成型机壁厚控制系统的原理、构成及其特性进行了研究.该塑料中空成型机利用液压驱动,可方便、可靠地实现整机的自动工作循环,利用电液比例位置控制系统,可随意控制型坯的壁厚变化规律,保证吹膜后中空制品壁厚均匀. 相似文献
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液压系统污染是造成液压故障的一个主要原因,为了确保液压系统能够安全、可靠运行,针对液压系统安装、使用提出一系列具体措施,以达到系统中的污染度控制。 相似文献
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根据煤矿瓦斯治理及煤矿水害防止过程中钻探的实际工况,结合测井及测斜装置的特点以及水压实验的要求,确定承压缸的主要参数。通过对各种密封形式的分析与研究,选择合理的密封形式及密封件,设计了一套结构简单、装卸方便、低成本、耐高压的大直径承压缸。通过工程应用实例,对承压缸的承压性能进行了验证。试验结果表明:承压缸的设计完全满足地球物理测井及测斜装置技术条件。 相似文献
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介绍了OMRON公司DeviceNet网络控制系统在液压专机上的应用,以CS1W-DRM21-V1作为PLC的DeviceNet网络模块,配备相应的离散式模块及元件,用DeviceNet网络相连,构成了液压机电控系统总成,达到了既经济可靠又便于扩展的设计目的. 相似文献
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Prevention of catastrophic bearing failures caused by excessive thermally induced preload is one of the key issues in the design and operation of high speed spindles. Temperature monitoring and shutting the spindle off in hazardous conditions is at present the most common method of avoiding bearing seizure. However, due to a rapid heat built-up and measurement delay, this solution in not reliable. An improved protection can be achieved either by custom systems with springs or hydraulic actuators that maintain a steady preload, or by monitoring the instantaneous preload and appropriate, predictive adjustment of machining conditions. While the former approach increases the cost of spindles and degrades their potential reliability, monitoring and proactive control of the actual preload eliminates these disadvantages. Its feasibility is predicated upon fast, reliable and accurate in-process preload estimation. A suitable estimation algorithm proposed in this paper employs vibrations of the spindle housing measured by means of accelerometer(s) and analyzed in the context of mechanical multi-degree-of-freedom model of the spindle assembly treated as a component of the entire machine tool. Representative experimental results are presented. 相似文献
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针对乳化液循环使用过程中会不可避免地带入其他杂油,对乳化液的冷却润滑性能及产品表面质量带来不良影响的问题,根据本钢五机架六辊冷连轧的生产实际,分析认为轧机液压、供油系统和轴承座密封泄漏是导致乳化液杂油含量高的主要原因。为此,从支撑辊轴承座维护角度采取一系列有效措施,如提高轴承座密封性能,装配时精确对中以防止密封损坏,控制轴承座润滑油供油压力,轴承座装配后进行打压试验等,使乳化液杂油含量由最高的50.37%降低至平均12.64%左右,提高了产品质量,降低了生产成本。 相似文献
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This paper presents a simulation method based on system dynamics to establish a comprehensive prediction model for the thermal and mechanical behavior of a spindle–bearing system in consideration of bearing surroundings such as assembly tolerance, geometric dimension, cooling conditions, operating conditions and thermal deformation. By introducing a lumped element into the system, not only mechanical properties but also thermal behaviors can be readily examined and predicted. The most important behavior in the spindle–bearing system is the bearing pressure, which determines the spindle characteristics and friction moment. In this study three different simplified assemblies are investigated. One is the bearing inner race–shaft subassembly that includes a negative assembly clearance, and another is the outer race–housing assembly that includes a positive assembly clearance. The third is the entire system that is composed of a rolling element bearing, an inner race–shaft subassembly and an outer race subassembly. The two subassemblies are coupled by rolling elements in which the frictional moment and heat generation vary with the assembly clearance and thermal deformation of the bearing surroundings. The new method can be applied to spindle cooling as well as the optimal thermal and mechanical design of the spindle–bearing system for various surrounding conditions. Furthermore, on the basis of the proposed model, the effect of steel and ceramic bearing materials on the thermo-elastic behavior of the spindle system was investigated. 相似文献
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以小型液压机液压系统为例,利用三维设计软件Solid Works辅助液压集成块阀体设计;利用Simulation Xpress应力分析工具对阀体进行了有限元分析,生成了二维工程图;建立了三维液压元件库,完成了液压集成块的装配,生成了装配体的爆炸图,制作了集成块备件手册,具有实际的工程应用价值。 相似文献