数控车床加工坐标系的建立

文章以华中HNC—22T系统ck6136s为例,分别介绍了利用G 92、G 54~G 59及T指令3种不同指令建立加工坐标系的对刀方法及原理。     

数控车削加工中用G50建立工件坐标系及应用

在多年的数控技术教学过程中,无论是理论教学还是实践教学,发现很多同学对数控机床的机床坐标系和工件坐标系混淆不清,从而编程时用G50建立工件坐标系时不能够灵活应用,实际加工时往往会出现乱刀现象。本文以GSK980T系统为例,对G50建立坐标作一探讨。     

基于FANUC 0i-M数控系统操作问题分析

FANUC0i—M数控系统实际操作过程中常见的工件坐标系与设定位置不一致、自动运行时主轴不能旋转和加工中心采用多把刀具加工时刀具长度补偿三种问题进行具体分析和处理。     

数控车床螺旋型四工位电动刀架的换刀原理及故障诊断

数控车床电动刀架是数控技术的重要内容之一,是将电能转变为动能的重要机件之一,是数控车床实现正常工作的必不可少的部件.目前数控电动刀架国内生产厂家大多是小规模或不成规模的,技术质量和技术开发能力都不是很好,与国外同行的差距不小,且频繁发生刀架换刀故障,制约了国内数控技术的发展.本文根据多年的教学、维修经验,从数控车床电动刀架的换刀原理入手,分析在换刀过程中可能出现的故障现象,总结出电动刀架故障排除的方法.     

数控车床的刀架故障检测与维修

数控车床在使用过程中,车床刀架经常换位,容易出现机械或电气的故障,文章总结数控车刀架的检测方法,排除故障,提高设备的使用率,这也是工程技术人员的责任。     

“零件数控车床加工”精品课程建设的若干思考

概述了技工院校精品课程建设的现状,提出了技工院校精品课程建设的必要性。以江西赣州技师学院零件数控车床加工精品课程建设为例分享了一些建设经验,主要包括两个方面:教学体系改革、教学内容的组织与安排。教学体系改革的特色是"校企双制,工学一体",实现了精品课程与一体化的有效结合。教学内容的组织与安排方面提出了教学内容设计、课件视频制作的一些有益方法,对于技工院校精品课程建设具有一定的借鉴意义。     

The stability analysis of time-varying delayed systems based on new augmented vector method

This paper focuses on the stability analysis of systems with interval time-varying delay. A new augmented vector containing single and double integral terms is constructed and the corresponding Lyapunov functional with triple integral terms is introduced. In order to improve the estimating accuracy of the derivatives of the constructed Lyapunov functional, single integral inequalities and double integral inequalities via auxiliary functions are employed on the first step, then an extended relaxed integral inequality and reciprocally convex approach are further utilized to narrow the scaling room of the functional derivatives. As a result, some novel delay-dependent stability criteria with less conservatism are derived. Finally, numerical examples are provided to check the effectiveness of the theoretical results and the improvement of the proposed method over the existing works.     

法向矢量耦合波分析法在微电子结构CD分析中的应用

光栅结构是微电子技术以及集成光学等方面常见的结构。其结构尺寸参数的测试技术在国际上已有很多年的发展历史,但还存在很大的研究和发展空间。当今比较有优势的方法是光栅衍射测量方法。该方法是基于精确的衍射理论,通过计算,可反演出目标结构的某些关键尺寸。严格耦合波分析法(RCWA)是该理论的基础。RCWA在一维情况下得到完美的实现,但对二维光栅,则存在衍射展开阶次高,收敛慢的缺陷。文章进一步研究NV-RCWA,对比多种常见周期结构使用不同法向矢量场的效果。     

中国产业结构趋势分析的向量自回归模型/FONT

摘要：利用1978～2004年共27年数据研究发现,我国三大产业发展速度之间存在紧密的内在联系,从系统动力学的角度而言,某个产业其发展不仅与该产业前期的发展有关,而且受其他产业同期和前期发展速度的影响。从脉冲响应函数和方差分解的结果可以看出,以农业为代表的第一产业的重要性最为明显,农业的发展对本身发展以及第二、第三产业的发展都十分重要。     

浅谈数控机床机械故障的诊断方法

文章分析了数控机床机械结构的组成及特点,并对数控机床机械结构提出了要求,总结了数控机床机械结构故障诊断的一系列方法,进而能够熟练运用掌握的技能处理各种不同的故障。     

The proportionalities method of dimensional analysis

Three traditional problems in accelerative mechanics are chosen to exemplify the manner of working by the proportionalities method. The formal construction of a proportionality is given and the form of the dimensional matrix of a monomial is discussed. Having chosen the dimensional in which the (n+1) term reduction of the variables of a dimensionally homogeneous set is to be explicitly dimensionally homogeneous, the variables of other dimensions may be systematically combined, as necessary, to leave only terms in the first chosen dimension and one other. The variables of the first dimension, together with the proportionalities formed in terms of the first dimension, can then be arranged to encompass the whole relationship between the variables of the set. This is done in a manner which readily allows formal display of all the choices in the nondimensionalization process of reduction from the (n+1) term equation to the n term nondimensional equation.