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刘培跃 《石家庄职业技术学院学报》2015,(2):27-29
螺距误差是影响数控机床定位精度的重要因素,也是验收和检测的重要指标.在分析螺距误差补偿原理的基础上,通过对VDF850型加工中心X轴进行螺距误差补偿,阐述了FANUC系统数控机床螺距误差补偿的方法:安装高精度位移检测装置;设定螺距误差补偿参数;编程序,记录并求值,形成螺距误差数据;将补偿值输入数控系统后重启. 相似文献
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研究利用双频激光干涉仪检测数控机床位置误差方法及数据分析,阐述了两种误差补偿方法即补偿软件误差补偿法和数控机床的系统参数补偿法。实践表明,经过误差补偿,数控机床的加工精度可以明显提高。 相似文献
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黄琳莉 《武汉职业技术学院学报》2015,(3):79-81
对于开环和半闭环控制的数控机床,使用螺距误差补偿能有效的提高数控机床的定位精度。以采用HNC-21TF数控系统的华中数控HED-21S数控原理试验台为例,介绍了螺距误差补偿的参数设置、误差检测和数据处理方法。 相似文献
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误差补偿是提升数控机床加工精度的主要方法,引起数控机床产生误差的因素较多,综合测量法是数控机床误差检测的常用方法,本文重点阐述了通过修改NC数据对数控机床几何误差进行补偿的原理,并通过仿真实验加以验证,表明了方法则称(NC数据)对数控机床误差补偿的实用性. 相似文献
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影响数控机床实际加工误差的原因主要有系统、机械、工艺参数、刀具、环境等几个方面因素。根据其误差的特点,我们把误差划分为系统性误差和随机性误差。把某些固定不变的或有确定变化规律的误差归属为系统性误差,把不确定的、无规律的误差归属于随机性误差。系统性加工误差一般由丝杆螺距误差、导轨形位误差、步进电机步距角误差,以及采用无隙齿轮减速传动机床的齿轮周节误差等部分组成。对于系统性误差一般可通过下列二种方法解决:(1)找出产生误差的根源性零部件,采用更换低精度部件,调整安装精度等方法解决;(2)采用误差补偿方法,有些系统… 相似文献
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数控机床是一种高精度、高效率、高柔性、高技术的现代化机电设备,其应用越来越普及。提高机床效率、保证加工精度、确保产品品质是生产所必需的。本文针对西门子802d系统数控机床,从反向间隙补偿、刀具补偿、程序补偿三个方面阐述数控机床发生精度误差时的补偿解决方案与实现。 相似文献
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通过对数控机床精度的类型特点和影响机床精度原因的分析,了解各类误差补偿方法的应用场合,提出了提高数控机床精度的一些措施。 相似文献
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数控机床是机械、钢铁、汽车等行业的主要生产设备,而误差也成为影响数控机床精密度的主要因素。利用拓扑结构来对西门子数控铣床的误差进行建模,通过对误差模型的分析,在安装与制造过程中对误差项进行控制和补偿,从而提高数控铣床的加工精度。 相似文献
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本文对数控机床几何误差产生的原因作了比较详细的分析,对系统误差的补偿方法进行了归纳,并在此基础上阐述了各类误差补偿方法的应用场合,为进一步实现机床精度的软升级打下基础。 相似文献
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周树强 《成都航空职业技术学院学报》2015,(3):54-56
文章介绍了利用激光干涉仪检测技术和FANUC 0i MD数控系统螺距误差补偿功能,针对QP2033-L精密四轴加工中心加工产品出现X轴方向尺寸超差较大的现象,对其进行定位精度检测并补偿,这样可提高机床的精度。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献