查询词典 numerical control

It is available to carry out numerical simulation and fluid dynamic analysis further. Based on Frozen-Rotor Approach and Rotor-Stator Approach, the numerical simulation was carried out in the centrifugal pump and the numerical results showed that the flow in the impeller and volute of centrifugal pump is periodically unsteady. Due to the interaction between impeller and volute the flow is characterized by pressure fluctuations and it is the strongest at impeller outlet and at the vicinity of the tongue. The unsteady pressure fluctuations are also one of the most important reasons to induce vibration and noise. Secondly, the flow field of the volute is characteristic of the vortex flow, and the vortex flow presents very complicated developing process which is creating, increasing and dissipating every now and then. All these lead to very large flow loss in the volute.

采用Frozen-Rotor冻结转子模式和Rotor-Stator滑移界面模式系统开展了不同工况下离心泵内叶轮与蜗壳耦合的定常和非定常流动研究，结果表明由于叶轮与蜗壳的干扰蜗壳进口周向流动的不均匀性是非常强烈的，特别是叶轮与蜗舌间的相互干扰最为强烈，一直影响到叶轮进口和蜗壳扩散管出口的流场；在蜗壳内整个流动是以旋涡形式向出口推进的，并随着包角的变化旋涡表现出十分复杂的产生、发展和耗散的演化过程，导致蜗壳内较大的流动损失。

To assure parts' machining precision and to improve productivity, touch probe is used to inspect cylinder of parts on machining centers, thus coordinate of points on features are acquired from numerical control system by a data collecting program, and cylindricity error is calculated by computer. This method has broken the restriction of probe's macro processor that couldn't work out cylindricity error. Data saved in computer are beyond the limited memory of numerical control system, which improves operation speed.

为了保证零件加工精度和提高生产率，在数控加工中心中采用触发式零件检测测头对被加工件的圆柱面进行在机检测，并利用数据读取程序从数控系统内部提取被检测点坐标信息，在计算机内部完成圆柱度误差的计算，克服了零件检测测头自带宏程序无法对圆柱等被测特征进行误差运算的局限性；并且检测数据存储于计算机内，不再受数控系统内存小及运算速度慢的限制。

The table recent years our country numerical control gold cut theengine bed the production, the import, the exportation and the expensesituation Our country numerical control engine bed at present developmentcondition -- upscale product: The production are very few, moreovernearly all with beyond the border function part necessary, some orforeign brand China makes, the GPD value calculated you, the profitminute go very many; Middle-grade specially is on the middle-gradeproduct: The Chinese brand, the foreign function part and the coretechnology, you gain the capitellum, he gains the big end.

我国数控机床目前的发展状况──高档产品：生产很少，而且几乎都用境外功能部件配套，有的还是外国品牌中国制造，GPD值算你的，利润分去很多；中档特别是中档偏上产品：中国品牌，外国功能部件和核心技术，你赚小头，他赚大头。

On the foundation of manufacturing numerical control jet electroforming machine, In this thesis, for numerical control jet electroforming, the research presented creative and conclusion works as follows

本文在研制和开发数控喷射电铸机床的基础上，对数控喷射电铸进行了以下几个方面的研究并做出了一定的创新

The procedure,method of the lectotype and checking calculation of the nut set of ball screw in numerical control reforming of longitudinal feed system are expounded,which can be used as a reference of numerical control transformation machine.

阐述了该车床纵向进给系统改造中的滚珠丝杠副的选型和验算的步骤及方法，可为机床数控化改造提供一种参考。

The computer aided automatic programming technique is to make use of computer to produce numerical control program so as to solve the basic contradiction of the numerical control machine's high-speed and high-efficiency and the complex, lowly efficient and the mistakable manual procedure.

计算机辅助自动编程技术是利用计算机辅助产生数控程序解决长期以来数控机床高速高效的加工能力和手工编制数控程序复杂繁琐、效率低、易出错的基本矛盾。

This dissertation realizes one open architecture computer numerical control system for three axis numerical control engraving and milling machine using computer software, hardware and DSP technologies.

本论文利用计算机软件、硬件技术、数字信号处理器技术，实现了用于开放式三自由度数控雕铣床的计算机控制系统。

In designing the course of the use of electric drive and PLC, numerical control technology, electromechanical integration, Siemens Numerical Control System, and other aspects of knowledge and theories.

在设计的过程中运用了电力拖动与PLC、数控技术、机电一体化、西门子数控系统等方面的知识和理论。

With the development of the technology of numerical control, the open system of numerical control has become an important develop direction.

随着数控技术的发展，开放式数控系统已成为一个重要的发展方向。

Key words: numerical control machine tool; numerical control machining; opposite clearance; vector operation; precompensation

关键 词：数字控制机床；数控加工；反向间隙；向量运算；预补偿

The dissecting of samples in group2 were difficult. The root of pulmonary artery and ascending aorta failed to be unfolded because fibrous tissue was tough, right and left fibrous trigone were too firm to be solved by hand. Cardiac muscle fibers couldn't be stripped along myofibrillar trajectory since they were prone to break because of their friability.

组2的心脏解剖困难，表现为纤维组织坚韧，游离肺动脉非常困难；徒手无法松解左、右纤维三角，肺动脉和主动脉根部的游离非常困难；心肌纤维坚硬、质脆，解剖时容易断离成碎块，无法沿纤维走行方向剥离。

We have battled against the odds in a province that has become increasingly violent.

我们对在一个争夺日益激烈省的可能性。