数控机床的刀具补偿及偏置功能

阐述数控机床加工过程中刀具半径补偿和长度补偿的意义和过程,揭示了刀具长度和半径补偿的实质,提出了计算补偿量的具体方法,阐明了刀具位置补偿的建立、补偿及取消的全过程,重点分析了数控加工中的刀具的二种补偿功能,并简述了刀具补偿在数控加工中的应用。     

刀具补偿在数控加工中的应用

在上世纪早期的数控加工中,编程人员根据刀具的理论路线和实际路线的相对关系来进行编程,容易产生错误。刀具补偿的概念出现以后,在数控加工中发挥了巨大的作用,有效提高了编程的工作效率。数控加工中常用的两种补偿是刀具半径补偿和刀具长度补偿,这两种补偿为我们解决了加工中因刀具形状而产生的问题。     

数控车床加工刀具补偿浅析

本文以数控车床车刀具补偿为研究,分析了刀具位置补偿的原理和应用。并且分析了刀尖圆弧在加工中产生误差．从而确定在数控加工中必须进行刀尖圆弧半径补偿。同时研究了刀尖方位的确定和刀尖圆弧半径补偿指令的应用。     

浅析数控车削加工中的刀具半径补偿

本文全面介绍了在数控车削加工过程中的刀具半径补偿产生的原理和解决方案。数控车刀具半径补偿是数控系统中的重要功能,正确地使用该功能,能有效保证产品质量并提高生产效率。通过在数控车削加工中的刀具半径补偿原理分析,介绍了在编程刀具半径补偿中的使用方法。在实际车削加工过程中,由于不同种类的刀具在尺寸、形状上是不一样的,在加工中会产生欠切、过切的加工误差。因此,在数控车削加工中加入刀具半径补偿指令,数控机床能根据实际使用的刀具尺寸及规格,自动调整个刀具的走刀轨迹,避免欠切和过切现象的产生,同时能提高编程效率并保证零件的加工质量和精度。所以,通过刀具半径补偿能实现,在数控编程时根据刀具中心的轨迹进行编程;在数控系统中先设定偏置的相关参数,数控系统就能自动计算轮廓轨迹,使刀具加工出符合图纸要求的合格零件。     

数控铣床加工中刀具半径补偿原理及其应用技巧

数控铣床手工编程中刀具半径补偿功能应用非常广泛,正确、灵活的运用刀具半径半偿能对减少计算、简化编程和零件加工精度有着十分重要的意义。结合实际情况说明数控加工编程时刀具半径补偿功能的关键问题和遇到问题的处理方法,解决了怎样正确合理的运用刀具半径补偿功能以确保零件数控加工时的准确性等问题。对于刀具半径补偿功能指令在实际编程加工中应用中的注意事项及应用技巧提出了明确的方法。     

数控加工中的补偿问题

本文分析了数控加工技术中刀具长度补偿，刀具半径补偿、夹具补偿的作用和应用意义，结合实际生产情况，阐述了如何通过各类补偿的灵活运用，提高数控加工程序编制和数控机床操作的效率。     

刀具半径补偿在数控车削加工中的应用

在数控车削加工中,刀具半径补偿非常重要,刀具半径补偿的过程有刀补的建立、刀补进行和刀补撤消三个步骤,本文以具体实例介绍了车削加工中刀具半径补偿功能的运用方法。     

刀具半径补偿在数控铣削加工中的应用分析

数控铣床加工是现代机械加工中最常用的加工方式,加工过程在保证加工效率的同时,还要保证加工产品的尺寸公差和表面质量。刀具半径补偿功能不仅对工件尺寸公差调整有一定作用,而且对工件表面质量也有很大影响。在阐述刀具半径补偿的定义、刀具半径补偿过程的基础上,对刀具半径补偿在数控铣削加工中的应用进行了分析。     

刀具半径补偿在数控铣床中的应用

合理利用刀具半径补偿功能可以有效提高数控铣床加工的精度,提高产品质量,探讨刀具半径补偿功能在工件加工时的方法。     

数控编程中刀具半径补偿的应用技巧

刀具半径补偿指令是加工中心和数控铣床上一个常用的应用指令,实际使用中经常出现程序校验错误或补偿后的运动轨迹异常等现象.本文以铣削加工为例,详细分析了刀具半径补偿指令在数控铣床编程中的使用技巧.     

Tool selection and collision-free in 5-axis numerical control machining of free-form surfaces

The methodology of 5-axis cutter selection to avert collision for free-form surface machining by flat-end cutters is presented.The combination of different cutters is adopt aiming at short machining time and high precision.The optimal small cutter is determined based on the geometric information of the points where a cutter most probably collide with the machined surface.Several larger cutters are slected to machine the surface in order to find the interference-free area.The difference of machining time for this area between the optimal small cutter and the large cutters is calculated.The functional relationship between the machining time and the radius of a cutter is established,by which the optimal number of cutters is obtained.The combination of cutters,which possesses the minimum overall machining time,is selected as the optimal cutter sizes.A case study has demonstrated the validity of the proposed methodology and algorithms.     

New Method for Studying Rock-Breaking Mechanism by Disc Cutters

Gaining a thorough understanding of the theoretical principles of rock breaking with a disc cutter is a critical issue in tunnel boring machine (TBM) technology. To fully consider the complexity and importance of the basic principles of rock breaking during tunnel excavation, in this paper we use a new method, the smooth particle hydrodynamics (SPH), to study the rock-breaking mechanism and verify its accuracy and feasibility. Using the SPH method, we induce the rock fragmentation process with two cutters in synchronous and sequential orders. The results show that when the cutters act on rock sequentially, the second indentation influences the crack evolution of the first indentation. With increased cutter spacing, the second crack gradually becomes independent of the first crack. Under synchronous action of the two cutters, a bursiform nucleus is generated beneath the cutters and the area of the nucleus increases with increased cutter spacing. Whether the cutters act on the rock sequentially or synchronously, we found the optimum cutter spacing of our chosen rock type to be 60 mm. Our analyses results show that the efficiency of sequential rock cutting is superior to synchronous cutting, both with respect to crack evolution and cutter force.     

基于高速切削的机夹刀切槽加工工艺

通过对机夹切断刀和切槽刀在不同加工中的比较选择,探讨高速切削中的机夹切槽刀具体应用和加工方法,解决了高精度工件加工中的切断和切槽的工效和精度问题,从而达到提高整件加工的效率的目的。     

改进换刀点设置提高数控车床的加工效率

数控车削批量加工时,选择简便的换刀方式,是减少换刀辅助时间、减少机床磨损、降低加工成本的有效途径。改进换刀点设置是为达此目的进行的有效尝试之一。     

刀具半径补偿在零件加工中的扩展应用

主要介绍了刀具半径补偿在零部件粗、精加工中的具体运用,同时针对刀具半径补偿在实际操作应用中应注意的问题进行了分析,使初学者在零部件的加工应用中能够合理地掌握和运用刀具补偿功能。     

对称加工的关键技术

To improve the machining efficiency of large symmetrical freeform surface, this paper proposes a new machiningmethod: symmetrical machining (SM). Based on the concept of collision avoidance plane (CAP), collisions among cuttersor headstocks are avoided, and the area of machining residue is controlled effectively. Machining residue is eliminated dueto proper design of symmetrical tool in mechanism and control project. Taking 5-axis symmetrical machine with columnarheadstocks and flat cutters as example, this paper proposes collision avoidance algorithm. Finally, using a twin-skeg shipmodel surface as an example, the method is applied to avoiding collisions in original tool path. Simulation and real machiningresults show that the scheme is practical. Furthermore, the machining efficiency of SM is improved 85% more than that of thetraditional single cutter technology.     

新形势下高师学生思想政治工作刍议

改革开放以来，经济社会发生了巨大变化，人们的思想意识也呈现出许多新的特点，对高师院校的学生思想政治工作提出了新的任务和挑战，必须从工作思路、工件制度、工作方法等方面予以改进和加强，才能适应新形势下思想政治工作的要求。     

基于累积法的刀具补偿问题研究

介绍累积法的基本原理,通过对刀具补偿问题的相关实例数据进行线性回归,建立模型并加以残差分析,比较了普通累积法与传统的最小二乘法的优缺点,实验结果表明,累积法更具优势。     

Advocacy for school-based sexuality education: lessons from India and Nigeria

Drawing on evidence from a wider study on the cost and cost-effectiveness of sexuality education programmes in six countries, and focusing on the examples of India and Nigeria, this paper argues that advocacy is a key, yet often neglected component of school-based sexuality education programmes, especially where sex and sexuality are politically or culturally sensitive issues. It also suggests that advocacy is not a one-off activity but needs to be carried out continuously and adapted as contexts and needs change. Overall, this piece recommends that advocacy should be a key component of sexuality education work, and needs to be planned and budgeted for. Without such investment, country-level sexuality education programmes are likely to fail.     

应用程序控制定位元件实现数控车床工件的轴向定位

在数控车床加工过程中,工件定位、装夹时间的长短,决定了加工效率的高低。为改进数控车床传统的定位方法,最大限度地提高加工效率,通过分析经济型数控车床轴向定位原理,提出了应用程序控制定位元件的方法,实现了数控车床工件的轴向快速定位,大大缩短了工件定位、装夹时间,提高了产品的定位精度及加工效率。