数控加工与传统机加工工艺的区别

数控加工工艺是在传统机加工工艺基础上,通过与计算机数控技术、计算机辅助设计和辅助制造技术有效的结合,从而形成数控加工工艺,其相较于传统机加工工艺来讲具有较大的优势,成为当代加工行业不可或缺的重要加工工艺技术。文中分别从加工工艺、装夹及夹具、刀具、加工方式、切削用量及热变形等几个方面对数控加工和传统机加工工艺的区别进行了具体的阐述。     

数控加工的工艺处理分析

伴随着数控机床的出现,数控加工工艺不断发展并逐步完善成为一门应用技术,数控加工工艺是数控编程与操作的基础,合理的工艺是保证数控加工质量、发挥数控机床效能的前提条件,主要探讨数控加工的工艺分析处理。     

模具型腔数控铣削综合加工工艺优化

本文以模具型腔为研究对象,重点分析了数控加工工艺的优化问题,并对高速铣削和电火花加工在提高模具型腔数控加工效率、加工质量等特征方面进行分析,进一步实现综合应用,为工艺人员能够高效率地加工出高质量的工件提供理论支持及技术参考。     

关于数控加工的误差分析及应对措施

数控加工精度高、速度快,是目前零件加工行业的主流方式。但数控加工同样存在误差,若不控制好,影响的将是一大片。文章首先从程序编制、加工工艺、操作层面、机床系统自身等多个角度分析了数控加工中可能形成的误差来源,接着就如何应对以上误差进行逐一阐明,以期为提升数控加工水平而抛砖引玉。     

手机面壳模具型腔的数控加工工艺分析

该文结合模具加工方面的研究现状阐述了手机面壳模具型腔数控加工工艺的重要性,针对模具型腔形状多样、结构复杂,加工工艺复杂以及影响因素较多等情况,该文根据实际生产加工经验,基于NX软件的数控编程分析了手机面壳模具型腔加工的工艺要求及工艺的选择,总结了手机面壳模具型腔数控加工工艺的规范,以期为模具其他元件的数控加工提供一定参考。     

数控加工工艺标准化研究

本文主要围绕数控加工工艺的主要内容,重点分析了数控加工工艺的特点、数控加工工艺标准化存在的问题以及数控加工工艺标准化的途径,以期能为相关部门的需要提供借鉴和参考。     

数控加工技术在机械模具制造中的应用分析

随着传统机械加工技术的不断创新与发展,数控加工技术应运而生,并成为机械模具制造行业的新兴力量.本文首先介绍了数控加工技术的发展现状,其次阐述了数控加工技术的基本原理,然后分析了数控加工技术在机械制造中具有提高生产效率、实现生产自动化、增强产品性能的优势特征,最后从实施全面有效模具分类、优化数控加工技术流程、制定严格加工...     

数控车削加工工艺分析

在数控加工过程中,工艺分析对于机床的加工效率和零件的加工精度都有重要影响,本文以一个数控车削加工范例对数控车削加工工艺进行了详细的分析.     

汽车发动机曲轴数控切削用量优化的研究

切削用量优化是机械零件数控加工工艺过程的基础,合理选择切削用量不仅能够保证零件加工质量,还能提高生产率和降低生产成本。本论文以汽车发动机曲轴的数控加工为载体,充分利用现代数控加工技术,对发动机曲轴进行数控加工工艺分析,围绕如何进行数控切削参数进行规范化、系列化,探讨如何在数控加工中切削用量进行优化,从而制定合理的加工方案、加工工艺路线、编制数控加工程序、设计切削参数优化系统。     

基于表面粗糙度的机匣数控程序优化技术研究

航空发动机机匣零件多数为难加工材料,具有薄壁和大长径比等典型特征,根据工艺人员和操作工人的经验优化传统的数控加工程序,效率低,稳定性较差。本文提出采用数控程序切削力物理仿真的方法,基于控制零件表面粗糙度指标,对数控加工程序进行分段优化,确定不同程序段的切削参数,解决了机匣零件数控加工稳定性难以控制的问题。经过多次加工试验,验证结果稳定,工艺方案准确可行。     

飞机结构件加工域单元分层识别及构造方法

加工域的自动识别是自动数控加工编程的关键技术之一。为实现飞机结构件自动数控加工程序编制过程中工序件加工域的自动识别,建立了加工域模型,提出了一种实用、可行的域元分层识别方法。首先,根据工序件构建分层面,截切零件和毛坯;其次,依据层交结果构建层域元轮廓,生成层域元;然后,建立规则合并层域元生成域元;最后,通过匹配域元间纵向关系,构建域元树状模型。通过对飞机结构件的测试,证明了该方法的有效性和实用性。     

面向数控加工工时估算的模型特征识别

利用数控加工结构件的特征具有层次分布式特点,提出了基于面邻接关系的特征识别方法,将零件的面先分成基础面和约束面,再根据凹凸邻接关系组合为相应的层集合,以层作为特征识别的基础,通过层的识别和组合获得数控加工结构件的特征,并提取相关特征参数信息,结合机床的加工参数,对零件加工工时进行了估算,并进行了实例验证。     

Reverse engineering of machining operation planning

Computer-aided process planning (CAPP) is becoming increasingly crucial to today's computer-integrated manufacturing (CIM) and rapid production. To automate the process planning, feature-based operation planning systems have been suggested and studied extensively. In such a system, given a machining feature, the operator requires practical machining operation data for the feature. In this research, a system of reverse engineering is proposed to extract machining features and their associated machining operation data. Furthermore, a machining know-how database containing the extracted data is created for future operation planning. Since successful NC programs contain the machining know-how of skilled workers, the system is aimed at extracting the machining know-how data from the NC programs through reverse engineering. The extraction of the machining features and feature topologies has been addressed previously. The present paper deals with the extraction of machining operation data, including operation sequence, cutting conditions, machining type and cutting mode. A prototype of the system is developed and a machining know-how database is generated. The extraction of machining features and their associated machining operations has been verified through a variety of NC programs.     

Three-dimensional profile curve machining on three-axis machines

Presented in this paper is a tool path generation procedure for three-dimensional profile curve machining on three-axis machines, which is essential for making dies of automotive press panels. While sculptured surface machining has received a significant amount of attention, there has been very little work on profile curve machining. The most distinctive feature of profile curve machining is that the machine operator determines the exact cutter radius at the stage of numerical control (NC) machining. For this reason, profile curve machining usually makes use of the cutter radius compensation functionality of an NC controller. In this paper, four technological requirements for the profile curve machining are identified: (1) maintaining a constant machining width; (2) avoiding controller alarms; (3) avoiding unbalanced cutter wear; and (4) retaining down-milling. To satisfy these requirements, a tool path generation procedure is proposed, implemented and tested.     

回转体数控车削加工仿真的算法研究

提出了适用于数控车削加工仿真的毛坯细分方法和数据结构；为了加快处理速度，根据数控车削加工的特点，提出了一种快速计算圆孤刀轨数据算法；在此基础上给出了一种基于OpenGL显示机制的用于数控车削仿真的快速真实感图形显示算法。该算法可以在微机上动态显示高质量的车削加工过程刀具的运动，材料的去除和毛坯形状的变化。     

复杂曲面整体叶轮CAD/CAM技术研究

根据整体叶轮的结构特点和工艺要求，提出了复杂曲面整体叶轮CAD/CAM系统的结构，探讨了各模块的主要功能。对开发过程中的关键问题：直纹面叶片曲面的加工及无干涉刀位轨迹生成算法进行了讨论，并给出了相应的仿真。     

大型结构件数控加工在位计量检测技术研究

在位计量检测以加工机床为硬件载体,实现加工、测量一体化,对提高产品质量和生产效率有重要意义。介绍了数控加工在位计量检测系统的组成与方案的实现过程,对系统的性能进行了现场试验,结果表明大型结构件数控加工在位计量检测系统可对大型数控加工零件工艺过程中的尺寸和形位误差进行准确在位测量,大大缩短了大型数控加工件的定位时间,有效提高了一次装夹加工的效率和合格率,避免了工件的二次装夹,降低了生产成本,为数字化装配提供有力保证。     

A radius compensation method of barrel tool based on macro variables in five-axis flank machining of sculptured surfaces

Barrel tool radius compensation is very important to improve the five-axis CNC machining precision and efficiency of sculptured surfaces. By combining macro variables and math function of CNC controller, a radius compensation method of barrel tool based on macro variables in five-axis flank machining of sculptured surfaces was presented. The basic principle of barrel tool radius compensation in five-axis flank machining was firstly investigated. For a specific five-axis CNC machine tool with dual rotary tables, a relationship equation between compensated cutter location (CL) data and machine control (MC) data could be derived. A post-processor with the function of five-axis barrel tool radius compensation was then developed by using the C++ language, which could generate the NC programme with macro variables of barrel tool radius compensation. Finally, the NC programme was obtained automatically by the developed post-processor for the aero-engine blade surface machining. The machining process was simulated on the software VERICUT, and machining experiments were also conducted on the five-axis machine tool. Both the simulation and experimental results showed that the proposed method could perform the function of barrel tool radius compensation in the NC programme for five-axis flank machining.     

Extraction of milling know-how from NC programs through reverse engineering

To automate machining process planning, the acquisition and representation of machining knowledge or know-how in a reusable way is needed. The machining know-how is implied in NC programs made by experienced workers. In this paper, the methodology and system for extracting machining know-how in milling operations have been developed. With the system, machining features, operations and their associated cutting conditions (depth of cut, feed rate and spindle speed, etc.) and machining method can be extracted by analysing NC programs in conjunction with the tools used and workpiece blank model. The milling know-how is represented as a collection of these extracted data that can be used in future machining operations. To verify the system, actual NC programs for milling have been analysed and the milling know-how has been extracted successfully.