共查询到20条相似文献,搜索用时 653 毫秒
1.
数控机床维修中系统置换技术 总被引:1,自引:0,他引:1
介绍了某型号的数控车床的维修过程,对数控机床维修中系统置换技术进行了研究,分析了该机床产生故障的原因,提出了置换思路,设计了系统接口和PLC控制方案.总结了置换过程中需要注意的相关事项,强调了数控机床"二次破坏"会造成严重后果. 相似文献
2.
3.
针对邯钢2 180mm酸轧机组生产中存在的问题,介绍了打滑的概念,指出了打滑的危害,从机械设备和工艺两方面分析了打滑产生的原因,并对工作辊粗糙度、张力、压下量、乳化液浓度、轧制里程和工作辊直径等因素对打滑的影响进行了分析。同时,制定了合理的工作辊粗糙度使用策略,调整了前后张力及压下率分配,制定了合理的轧辊更换制度,编排了合理的生产计划、乳化液浓度制度,并根据生产钢种调整了防止打滑策略,取得了较好的效果。 相似文献
4.
物流搬运AGV的轨迹跟踪与控制 总被引:1,自引:0,他引:1
杨松华 《组合机床与自动化加工技术》2008,(6):72-74
以物流搬运自动导向车AGV的轨迹跟踪为研究目标。建立了三轮式AGV的运动学模型,并对其运动特性进行了分析,提出了AGV的运动控制策略,获得了AGV轨迹跟踪的控制规律,并利用Lyapunov函数验证了控制系统的渐近稳定性。以具有任意初始误差的圆和直线为参考轨迹,应用Matlab/Simulink对控制系统进行了仿真研究。仿真结果验证了控制策略的有效性和正确性。 相似文献
5.
6.
7.
简述了燃料流量调节阀的基本工作原理,建立了以燃料流量调节阀为主的动力系统数学模型,在不同工况下对其换速过程的动态特性进行了仿真,指出了存在的问题,并对今后的改进和试验提出了指导性意见. 相似文献
8.
详细地介绍了用PLC族伺服装置对Y7150磨床电气系统改造的设计与调试,简化了原有的线路,完善了故障诊断功能,从而提高了可维修性,同时通过对电气系统的硬件设计,提高了系统的可靠性和抗干扰性能。 相似文献
9.
将光电测量技术和计算机技术应用到轧钢车间冷热轧生产线,实现了对热轧钢带的在线动态测量和记录,应用世纪星监控组态软件实现了信息管理自动化,为生产者和客户提供了准确的产品信息,实现了企业对生产质量的在线优化控制,创造了显著的经济社会效益.为实现企业信息化又迈进了一步.本文较为详细地论述了系统的硬件构成和数据采集,信息管理的实现,给出了系统的结构图和软件流程图以及工作界面图,并给出了本信息管理系统的部分程序. 相似文献
10.
11.
Al2O3/Cu复合材料强化机理研究 总被引:4,自引:1,他引:4
采用内氧化法制备了Al2O3/Cu复合材料,进行了高温电子拉伸实验,并通过微观组织观察,分析了该复合材料的强化机理。拉伸实验结果显示:Al2O3/Cu复合材料不仅室温强度很高,而且高温时仍保持较高的强度。微观组织观察分析表明:细小的Al2O3颗粒的弥散分布是该复合材料具有高强度的主要原因,表现在:Al2O3颗粒存在能够抑制Cu基再结晶的进行;Al2O3颗粒的存在阻碍晶界亚晶界运动,从而阻碍晶粒长大;Al2O3颗粒的阻碍位错运动,增加位错密度;Al2O3颗粒的存在提高材料的蠕变抗力。 相似文献
12.
利用机械合金化法结合放电等离子烧结制备Al2O3/Cu铜基复合材料,采用XRD、SEM、硬度、抗拉强度和电导率等测试研究La含量对Al2O3/Cu复合粉末和烧结材料组织及性能的影响。结果表明:添加0.05%的稀土La有利于机械合金化过程中Cu晶粒的细化和Al2O3颗粒的弥散分布,从而提高烧结材料的显微硬度和抗拉强度。烧结材料的导电率随着La含量的增加先升后降,当La的质量分数为0.10%时,Al2O3/Cu复合材料的导电率提高11.3%IACS。 相似文献
13.
新型颗粒增强铜基复合电极材料Al2O3/Cu能较好地解决电阻点焊镀锌钢板时普通电极材料做电极寿命较短的问题。为了获得优化的Al2O3/Cu复合电极材料制备工艺,采用粉末冶金法制备Al2O3/Cu复合电极材料,通过改变制备过程中的工艺参数,以密度、显微维氏硬度、电导率、显微组织为检测内容,探讨压制力和烧结温度对Al2O3/Cu复合电极材料物理机械性能和显微组织的影响。结果表明,综合性能最优时的Al2O3/Cu复合电极材料制备工艺为:Cu-Al2O3混合粉末制坯压制力100 kN,烧结温度940℃。 相似文献
14.
15.
Relationship between powder characteristic and internal oxidation of Al in Cu-Al pre-alloyed powders
Shuhua LIANG ) Xianhui WANG ) Liang FANG ) Zhikang FAN ) ) Department of Materials Science Engineering Xi an University of Technology Xi an China ) State Key Laboratory for Mechanical Behavior of Materials Xi an Jiaotong University Xi an China 《金属学报(英文版)》2009,22(1):71-80
Since Cu-Al powder characteristics have important effects on the preparation of Cu/Al2O3 composite, the apparent activation energy of Al internal oxidation reac- tion in Cu-Al pre-alloyed powders with different characteristics was calculated in the present investigation. The microstructure and properties of the synthesized Cu/Al2O3 were studied. The results show that high-energy milling can obviously promote in- ternal oxidation of Al in Cu-Al powders in the same solid solubility. At the same milling condit... 相似文献
16.
Interaction behaviors between Al-Si, Zn-Al alloys and Al2O3p/6061Al composite at different heating temperatures were investigated. It is found that Al2O3p/6061Al composite can be wetted well by AlSi-1, AlSi-4 and Zn-Al alloys and an interaction layer forms between the alloy and composite during interaction. Little Al-Si alloys remain on the surface when they fully wet the composite and Si element in Al-Si alloy diffuses into composite entirely and assembles in the composite near the interface of Al-Si alloy/composite to form a Si-rich zone. The mierostrueture in interaction layer with Si penetration is still dense. Much more residual Zn-Al alloy exists on the surface of composite when it wets the composite, and porosities appear at the interface of Zn-Al alloy/composite. The penetration of elements Zn, Cu of Zn-Al alloy into composite leads to the generation of shrinkage cavities in the interaction layer and makes the microstructure of Al2O3p/6061Al composite loose. 相似文献
17.
18.
19.
Al2O3 particle-reinforced ZL109 composite was prepared by in situ reaction between CuO and Al.The microstructure was observed by means of OM,SEM and TEM.The Al2O3 particles in sub-micron sizes distribute uniformly in the matrix,and the Cu displaced from the in situ reaction forms net-like alloy phases with other alloy elements.The hardness and the tensile strength of the composites at room temperature have a slight increase as compared to that of the matrix.However,the tensile strength at 350 ℃ has reached 90.23 MPa,or 16.92 MPa higher than that of the matrix.The mechanism of the reaction in the CuO/Al system was studied by using of differential scanning calorimetry(DSC) and thermodynamic calculation.The reaction between CuO and Al involves two steps.First,CuO reacts with Al to form Cu2O and Al2O3 at the melting temperature of the matrix alloy,and second,Cu2O reacts with Al to form Cu and Al2O3 at a higher temperature.At ZL109 casting temperature of 750-780 ℃,the second step can also take place because of the effect of exothermic reaction of the first step. 相似文献
20.
Al 2O 3 PARTICLE REINFORCED COPPER MATRIX COMPOSITE USING FOR CONTINUOUS CASTING MOULD 总被引:6,自引:0,他引:6
S.H.Liang Z.K.Fan The Department of Material Engineering Xi'an University of Technology Xi'an China 《金属学报(英文版)》1999,12(5):782-786
1.IntroductionMouldisakeypartofcontinuouscasting.Themouldsurfacecontactswithmoltensteel(1500℃1600℃)andsolidprotectiveslagwhilethebackfaceofthemouldiscooledbywater.Inordertoassurethesteelblankpulledoutcontinuously,themouldmuststrictlykeepthedesigndi… 相似文献