共查询到20条相似文献,搜索用时 62 毫秒
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主要介绍了莱钢宽厚板定尺剪的结构和组成,以及主要剪切缺陷的产生原因。分析了影响定尺剪剪切精度的主要因素,并提出了提高定尺剪剪切精度的策略。经过改进后,定尺剪剪切误差控制在1‰以内。 相似文献
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介绍了4300mm宽厚板定尺剪的结构和组成,分析了影响定尺剪剪切精度的主要原因,并提出了提高定尺剪剪切精度的措施。经过改进后,定尺剪剪切误差控制在1%o以内。 相似文献
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以STD微机定尺飞锯系统为例,介绍了全数字调速控制器的功能、特点及其在改造UC—SCR—D微机定尺飞锯系统中的应用。 相似文献
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介绍德国伦茨的交流伺服控制器在直缝埋弧钢管超声波探伤上作为位置控制和速度控制的一种应用. 相似文献
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伦茨交流伺服系统在钢板横剪中位置全闭环的应用 总被引:1,自引:0,他引:1
在卷材横剪机组中,定尺送料控制系统是非常重要的组成部分。本文以钢板横剪机组为例,针对定尺控制的工艺要求,提出了伦茨(LENZE)伺服控制系统位置型全闭环应用的方案。实践证明,这些方案是可行的,并可靠地应用在大量的卷材横剪机组中。 相似文献
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基于ISP技术的交流伺服电机转子位置检测电路 总被引:1,自引:0,他引:1
介绍了基于ISP技术的交流伺服系统电机转子位置检测电路的设计和实现。该电路将所有的模块集成到一块高密度可编程器件中 ,提高了系统的稳定性 ;脉宽可调节的全数字四倍频电路和十二位可逆计数器保证了检测的精度 ;器件特性参数的一致性更有利于进行精确的轮廓控制 相似文献
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现代电子产品内部信息连接广泛应用扁平电缆,本文通过对其定长剪剥加工的机理进行对比分析,研究的加工方法和控制方式,在样机实验中得到良好验证。 相似文献
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A new intelligent control methol for welding positioner is propsed.Applying an improved fuzzy controllerand a variable PID controller,a two-mode intelligeng controller(TMICC)is dsigned on basis of fuzzylogic adn rules.The simulation and experimental results show that this control system can obtain better dynamic andstatic characteristics. 相似文献
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交流伺服系统和可编程控制器在束锯中的应用 总被引:3,自引:0,他引:3
周立求 《组合机床与自动化加工技术》2003,(1):73-74
介绍了交流伺服系统,可编程控制器和直流调速系统在束锯中的应用,论述了束锯的工艺控制特点,可编程控制器的硬件组成,软件编写方法,DRH交流伺服系统参数设定方法及性能特点,最后,详细分析了生产过程中出现过的典型故障的处理措施。 相似文献
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G.S. Fox-Rabinovich A.I. Kovalev B.D. Beake S.C. Veldhuis D.L. Wainstein 《Surface & coatings technology》2009,204(4):489-496
Machining of hard to cut materials such as hardened steels and high temperature strong aerospace materials is a challenge of modern manufacturing. Two categories of the aluminum-rich TiAlN-based Physical Vapor Deposited (PVD) coatings, namely AlTiN and TiAlCrN, are commonly used for this area of application. A comparative investigation of the structural characteristics, various micro-mechanical properties, oxidation resistance and service properties of the both coatings has been performed.Crystal structure has been studied using High Resolution Transmission Electron Microscopy (HR TEM). Electronic structure has been investigated using X-ray Photoelectron Spectroscopy (XPS). Micro-mechanical properties (microhardness, plasticity index, impact fatigue fracture resistance) have been evaluated using a Micro Materials Nano-Test System. Short-term oxidation resistance has been studied at 900 °C in air. The tool life of the coating was studied during ball nose end milling of hardened H 13 tool steel as well as end milling of aerospace alloys such as Ni-based superalloy (Waspalloy) and Ti alloy (TiAl6V4).It was shown that the set of characteristics that control wear performance strongly depend on specific applications. For machining of hardened tool steels, when heavy loads/high temperatures control wear behavior, the coating has to possess a well-known combination of high hot hardness and improved oxidation resistance at elevated temperatures. To achieve these properties, crystal structure for TiAlN-based coatings should be mainly B1, and elemental composition of the coating should ensure formation of strong inter-atomic bonds such as Al-Cr metal-covalent bonds in the TiAlCrN coating. Nano-crystalline structure with grain size of around 10-30 nm enhances necessary properties of the coating.In contrast, for machining of aerospace alloys, when elevated load/temperature combined with intensive adhesive interaction with workpiece material results in unstable attrition wear with deep surface damage, the coating should possess a different set of characteristics. Crystal structure for TiAlN-based coatings is basically B1; but due to a high amount of aluminum, the AlTiN coating contains AlN domains. The coating has a very fine-grained nano-crystalline structure (grains sized around 5 nm). Electron structure of energy levels indicates formation of metallic bonds. This results in plasticity increase at the cost of hot hardness reduction. The surface is able to dissipate energy by means of plastic deformation (instead of crack formation) and in this way, surface damage is reduced. 相似文献
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介绍了一种采用交流伺服电机驱动内啮合齿轮泵实现伺服控制的伺服液压机,主机吨位1250kN,其主要特征为:液压机主缸上下腔分别由两台交流伺服电机驱动内啮合齿轮泵单独控制,实现了对供入主缸上下腔流量的精确控制,从而实现对滑块位置、速度、压力等参数的精确控制。该伺服液压机具有高速、高效、高精、高柔性、低噪声、智能化、节能环保等诸多优点。其在精密零件成形、精密定程工艺、精密定压工艺、提高单次拉伸成形深度、冲裁工艺、新材料成形等方面有广阔的应用前景。 相似文献
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在厚壁管窄间隙全位置TIG焊中,弧长是影响焊接质量最敏感的焊接参数之一,由于钨极的烧损、前道焊缝的成形、熔池变化、焊件几何形状及全位置空间变化时重力引起的弧长调节的阻力不变变化等因素的影响,没有弧长调节功能,不可能维持电弧长度的肯定,特别是全位置焊接时,重力对弧长影响非常突出,必须采取特殊的控制方法克服其不良影响,因此作者设计了基于单片机控制的弧压传感可变增益PID控制器,并针对不同的弧压偏差范围采用快速控制、分离积分和附加不敏感区来改善其控制品质,在实际产品焊接中取得了较好的控制效果。 相似文献