数控机床维修现状分析

随着我国经济的不断发展,数控机床成为工业和制造业生产中不可缺少的设备,能够提高生产效率和精度,因数控机床是高精密设备,在使用中难免会发生故障,我国在维修数控机床方面较西方国家有很大差距,本文主要分析数控机床的维修现状,并提出解决维修现状的措施,进而为企业提高经济效益。     

数控加工机床的选用方法

随着我国制造业快速发展，数控机床使用愈来愈广。但目前数控机床品种规格繁多，有的用于数一控加工，有的用于数控成型。因此如何选择一台适合需要的数控机床已成为广大用户十分关心的问题。而且数控机床结构复杂、初始投资大、维修难度大且成本高，所以在选用数控机床时必须认真进行技术经济分析，使数控机床发挥最佳效益。     

数控机床的电气维修技术研究

随着社会工业化建设进程的不断加快及我国科技水平的快速提高,数控技术在工业生产中的应用范围越来越广泛,但是在数控机床的电气维修工作中仍然存在着一些问题,这些问题的出现在一定程度上制约着我国数控技术的发展.文章针对数控机床的电气维修技术进行分析,并提出有效的解决策略,来实现数控技术在工业生产中的有效应用.     

数控机床的软硬件故障特征与维修合理性分析

数控机床是现代机械加工行业的主要设备,对于数控机床产生的故障问题,必须要做到及时合理的维修,才能确保机床尽快恢复良好的工作状态,以良好的效率完成机械加工的相关任务。对数控机床的技术现状和应用可靠性情况进行了介绍,说明了数控机床的软硬件故障的常见特征与故障处理方法,并对数控机床故障修复的合理性加以详细说明和分析,希望能提高数控机床故障的维修效果。     

数控机床故障诊断与维修方法

现如今,我国的数控技术的发展非常迅速,数控机床的应用相当普遍,随之而来的就是数控机床的结构却越来越复杂、种类也越来越多,那么在数控机床发生故障时,面临的维修问题也就变得更加复杂,这就需要掌握一定的故障诊断方法和维修方法,尽快排除故障,保证机床的正常运转。     

数控机床常见的故障与基本处理技术分析

随着科学技术的发展,我国的加工工业近几年发展极为迅速,数控机床的使用也更为广泛。随着先进的数控技术与机电一体化的结合,很好的提升了加工业的效率和精度,有力的促进了机械加工业的发展。当前的数控机床以微处理器为基础,应用集成电路对机床要推动一体化的数控机床的发展,必须从改进操作和进行数控机床的批量生产,同时大量引进先进的技术和生产方式并进一步的推广应用,这也是机械制造业发展的重要条件,更可以进一步有力的促进我国社会经济的发展。文章通过探索常见的故障与基本处理技术以及数控机床维修技术中常见的故障处理方式,分析数控机床维修技术和方法,为保障各类数控设备能正常运行提出一些粗浅的见解,而且对数控技术的发展和完善也有一定的推动作用。     

数控机床控制技术与机床维修

伴随着社会科学技术的不断发展,数控机床控制技术和机床的维修方法也越来越丰富。为了提高数控机床的工作效率,促进该行业的快速发展,文章对数控机床控制技术展开了分析,并对数控机床的几种维修方法进行探索。     

简析数控机床维修改造中的问题与对策

近年来,为助推工业发展,我国引进了很多国外的先进设备和技术,如数控设备。数控机床作为数控设备的典型代表,是现代工业生产中最为重要的自动化生产设备之一,可大幅度提高企业经济效益。虽然我国的数控技术在不断进步,但在数控机床的维修改造方面还面临着不少问题。文章就此进行分析,并提出了相关对策,仅供参考。     

数控机床的故障判断与维护

数控机床应用范围广泛,是集高、精、尖技术于一体,集机、电、液于一身的高技术产物,已经成为衡量制造业现代化发展水平的重要标准之一。数控机床,一旦某一部位出现故障,将会严重影响企业的生产效率和经济效益。在面对数控机床的故障诊断维修问题上,必须从三个方面入手:首先做好数控机床操作人员的技术培训,掌握正确的设备操作步骤和方法,避免出现人为性故障的发生。其次,要做好数控机床的日常维护保养,定期合理维护才能够最大限度地控制数控机床故障发生几率,防患于未然。再者,对于数控机床维修技术人员,要注重对数控机床的技术资料的存档,注重对维修资料的收集和维修经验的总结、维修技术的培训。     

数控机床维修改造中的问题与对策研究

提升数控机床的应用效率,不仅能够促进机械零件的批量生产,还能进一步提升数控加工质量,从而为促进我国工业化社会的进步打下坚实的基础。本文主要通过研究分析数控机床维修改造中的问题,在此基础上提出了相应的对策。     

Overland water and salt flows in a set of rice paddies

Cultivation of paddy rice in semiarid areas of the world faces problems related to water scarcity. This paper aims at characterizing water use in a set of paddies located in the central Ebro basin of Spain using experimentation and computer simulation. A commercial field with six interconnected paddies, with a total area of 5.31 ha, was instrumented to measure discharge and water quality at the inflow and at the runoff outlet. The soil was classified as a Typic Calcixerept, and was characterized by a mild salinity (2.5 dS m⁻¹) and an infiltration rate of 5.8 mm day⁻¹. The evolution of flow depth at all paddies was recorded. Data from the 2002 rice-growing season was elaborated using a mass balance approach to estimate the infiltration rate and the evolution of discharge between paddies. Seasonal crop evapotranspiration, estimated with the surface renewal method, was 731 mm (5.1 mm day⁻¹), very similar to that of other summer cereals grown in the area, like corn. The irrigation input was 1874 mm, deep percolation was 830 mm and surface runoff was 372 mm. Irrigation efficiency was estimated as 41%. The quality of surface runoff water was slightly degraded due to evapoconcentration and to the contact with the soil. During the period 2001–2003, the electrical conductivity of surface runoff water was 54% higher than that of irrigation water. However, the runoff water was suitable for irrigation. A mechanistic mass balance model of inter-paddy water flow permitted to conclude that improvements in irrigation efficiency cannot be easily obtained in the experimental conditions. Since deep percolation losses more than double surface runoff losses, a reduction in irrigation discharge would not have much room for efficiency improvement. Simulations also showed that rice irrigation performance was not negatively affected by the fluctuating inflow hydrograph. These hydrographs are typical of turnouts located at the tail end of tertiary irrigation ditches. In fact, these are the sites where rice has been historically cultivated in the study area, since local soils are often saline-sodic and can only grow paddy rice taking advantage of the low salinity of the irrigation water. The low infiltration rate characteristic of these saline-sodic soils (an experimental value of 3.2 mm day⁻¹ was obtained) combined with a reduced irrigation discharge resulted in a simulated irrigation efficiency of 60%. Paddy rice irrigation efficiency can attain reasonable values in the local saline-sodic soils, where the infiltration rate is clearly smaller than the average daily rice evapotranspiration.     

车用发动机润滑油失效规律与更换周期研究

研究在正常使用条件下１０Ｗ／３０－ＱＣ级润滑油用于某型车用发动机时所表现的失效规律,确认期服从两参数Ｗｅｉｂｕｌｌ分布,并给出分布的尺度参数η和形状参数ｍ之最佳线性无偏估计（ＢＬＵＥ）同时,还为定量分析,计算车用发动机润滑油的使用可靠性和合理确定其更换周期提供了一套可供借鉴的方法,并给出了具体的计算实例。     

农村剩余劳动力就业问题的探讨

论述了我国农村剩余劳动力就业的意义,并针对我国农村剩余劳动力的现状,提出多渠道促进农村剩余劳动力就业的途径和办法。     

乡（镇）农业技术推广体系存在的问题及对策

乡（镇）农技推广体系是农业发展的关键。介绍朝阳市农业技术推广体系的现状,针对目前体制及运行机制、服务手段等方面存在的问题,提出适合朝阳市乡（镇）农技推广体系改革与发展的对策,以期对全省农技推广体系改革和发展起到一些借鉴作用。     

草莓的采收与贮藏

草莓果味酸甜爽口,营养价值高,为人们所喜爱的应市鲜果之一。由于草莓易受损伤和微生物侵染,因此其采收、贮藏过程极为重要。介绍草莓采收过程中的注意事项以及11种贮藏保鲜技术的实施步骤和操作方法,推介9种加工方式,为草莓产业化提供技术支持。     

金谷子耐旱TG118引种试种及推广应用

对引进的谷子新品种金谷子耐旱TG118进行品种比较试验和多点试种。结果表明：该品种抗旱、耐瘠、适应性强,稳产、高产、抗病抗风抗倒伏强,品质优良,粮草兼用,种植简单,省工易管;一般产量在6000kg/hm2以上,比当地主栽品种增产20%以上。最高产量达9450kg/hm2,适于在辽西北地区推广应用。     

对《种子法》存在问题的探讨

《种子法》是我国种植业第一部法律。自实施以来,为依法加强种子管理提供了有力的法律支撑,促进我国种子产业发生翻天覆地的变化。但随着依法管理工作的深入和种子产业的快速发展,《种子法》及配套规章的一些问题逐步显现出来。对《种子法》及配套规章存在的问题进行深入分析,对需要进一步补充的章节以及需要调整的内容进行深入探讨,以求更加完善和明确。     

瓦房店市水果生产标准化发展研究

瓦房店市是我国重要的水果生产基地,在国内水果生产领域占有重要地位。随着水果市场化的不断深入,如何满足和适应国内外市场需求成为瓦房店市水果生产的关键问题。从瓦房店市水果生产实际出发,阐述了实施水果生产标准化的必要性,提出了发展水果生产标准化的具体措施。     

和谐社会理论建设的几点哲学思考

在新世纪,面对机遇和挑战,党的十六大把“社会更加和谐”作为全面建设更高水平的小康社会的一个重要目标。中国人素有社会和谐的理想;西方人自古也向往社会和谐;借鉴东西方两种和谐社会思想的经验、教训,构建社会主义和谐社会理论。     

Review of the Egyptian experience in implementing land drainage projects

About 30 years have passed since the Government of Egypt embarked on implementing a series of large scale drainage projects. At present, about 3.8 million acres have been provided with drainage systems on the basis of systematic pre-drainage investigations and designs. The target is to provide drains in approximately 6.4 million acres in the Nile Valley and Delta.The implementation of the subsurface drainage system is carried out by the public sector and private contractors under direct supervision of governmental regional departments. The implementation process depends on many factors related to the drainage material, machinery, manpower, site requirements, farmers and organizations involved. Problems and constraints are sometimes challenging, however, the annual rate of implementation has gradually increased to 170,000 acre/year.This paper discusses the different aspects involved in the implementation process of drainage systems. The development in materials, machinery and construction technologies will be reviewed. Institutional and management factors are going to be also considered.