复杂型面小零件精密切削技术研究

随着科技的飞速发展,形状曲面复杂的小零件精密切削加工技术不断完善。微小零件的尺寸小、型面复杂、加工精度高,对加工技术的要求很高。精密切削是一种高效的微加工技术,可以适用于多种类型的工件切削加工。基于此,探讨了复杂型面小零件精密切削加工设备,重点分析了加工刀具的选用、影响加工质量的因素以及精密切削道具线路规划和参数选择等工艺问题。     

复杂曲面微小零件的微细切削工艺研究

微小零件由于尺寸微小、结构复杂、加工精度高,所以对加工工艺的要求极高。微细切削是微细加工技术中效率较高、工件材料适用范围很广的加工方法,在微小零件的加工工艺研究中特别重要。主要阐述了微细切削加工设备及刀具系统配置、微细加工的特点及工艺要求、复杂曲面微细切削加工刀具和参数的选择、复杂曲面微细切削加工的实际加工等问题,通过采用合理的加工工艺和走刀路线,可以实现微小型零件的高精度加工,满足微小产品的需求。     

超精密切削的复杂曲面微加工研究

随着微机电和纳米技术的快速发展,复杂形面微小零件的超精密加工显得越来越重要。本文通过对复杂曲面超精密加工的研究,针对金属材料制作的复杂形面微小零件的超精密切削工艺进行了深入研究。     

氟金云母可加工陶瓷极座切削试验研究

为了实现可加工陶瓷的精密加工,分别用高速钢刀具、硬质合金刀具、CBN刀具和PCD刀具切削氟金云母可加工微晶玻璃陶瓷材料,通过对刀具表面形面的观察,分析了氟金云母玻璃陶瓷加工过程中的刀具磨损过程、磨损形式及机制。基于氟金云母玻璃陶瓷刀具切削实验的结果,选择了合适刀具和工艺参数,开展了典型零件四极质量分析器固定极座的切削加工实验。     

铝合金材料薄壁零件精密车削技术

针对薄壁零件加工中刀具磨损较为严重,工件尺寸不易控制、尺寸精度及形位公差要求较高、工件易变形等特点,通过选用切削刀具,调整切削参数,分析了如何提高薄壁零件的加工形面精度,给出解决问题的具体方法。     

钛合金薄壁零件加工工艺技术研究

结合钛合金零件的加工特点,对钛合金薄壁零件进行深入分析,通过切削刀具材料、刃磨角度、切削要素、加工流程、浇注方式和夹紧力的制定等参数选择,解决钛合金薄壁零件精度高、难加工和易变形的切削难题。提高零件加工质量,从而达到保证零件尺寸精度及形位公差的目的。     

薄壁圆形零件的工艺分析及编程加工

针对薄壁圆形零件易变形、密封槽结构难加工等特点,通过合理分析零件的结构,融合先进的多轴加工技术,制定合理的零件加工工艺,选择合理的加工刀具及切削参数,有效地解决了密封槽的加工难题,保证了零件的形位公差,高效地完成了薄壁圆形零件的加工。     

燃气轮机零件上凹槽的高效仿形加工

环、盘、轴和机匣——这类燃气轮机发动机零件一般具有相对复杂的形状,通常需要在狭窄受限的空间内进行凹槽的仿形车削。这些零件的材料一般可加工性较差。高切削力、高切削温度和较强的沟槽磨损趋势对高效切削加工和切削刃提出了很高的要求,这就需要专门开发相应的刀具和加工方法。     

基于CKA6136的复杂轮廓数控切削工艺研究

研究了使用CKA6136数控车床来加工复杂回转体零件,探讨了如何合理制订加工工艺方案,设计工件装夹方案以及合理选择刀具来最终完成零件的加工.通过对复杂轮廓切削工艺的分析,为企业及实际生产过程中复杂回转体零件的加工提供了借鉴,有助于提高加工效率和保证零件加工精度.     

基于离散粒子群算法的复杂曲面微小零件切削参数优化研究

采用常规方法计算零件切削参数优化目标函数和约束条件时,忽略了生产效率和粗糙度两个变量,导致优化参数作用下的零件加工表面粗糙度较大和加工总工时较长。为提高生产效率和降低生产成本,提出了基于离散粒子群算法的复杂曲面微小零件切削参数优化方法,选择切削速度和进给量作为待优化切削参数,确定参数优化目标方向,对微小零件加工的功率、切削力、进给量及粗糙度等进行约束,利用粒子群算法求解优化目标和约束条件组成的数学模型,得到切削速度和进给量最优解。选择微小齿轮毛坯、铣刀及机床进行滚齿加工的对比实验,并采用设计方法和常规方法获取不同切削深度下的切削参数优化值。结果表明,设计方法减小了齿轮加工表面粗糙度,缩短了齿轮加工总工时,提高了滚齿表面质量和生产效率。     

Real-time cutting tool state recognition approach based on machining features in NC machining process of complex structural parts

Cutting tool state recognition plays an important role in ensuring the quality and efficiency of NC machining of complex structural parts, and it is quite especial and challengeable for complex structural parts with single-piece or small-batch production. In order to address this issue, this paper presents a real-time recognition approach of cutting tool state based on machining features. The sensitive parameters of monitored cutting force signals for different machining features are automatically extracted, and are associated with machining features in real time. A K-Means clustering algorithm is used to automatically classify the cutting tool states based on machining features, where the sensitive parameters of the monitoring signals together with the geometric and process information of machining features are used to construct the input vector of the K-Means clustering model. The experiment results show that the accuracy of the approach is above 95% and the approach can solve the real-time recognition of cutting tool states for complex structural parts with single-piece and small-batch production.     

零件的五轴加工

采用三维CAD系统,能够设计更为复杂的零件。要加工这类零件的五轴加工程序的编制是很困难的事。但是,随着功能完善和容量强大CAD系统的推广,从设计、制造到切削加工过程就变得容易了。因此,五轴加工中心的应用日益普遍,越来越多的零件采用五轴加工中心进行加工。智能机床方案使生产零件的五轴加工更趋实用。     

基于Cimatron E11的汽车转向球头销锻模加工刀具路径优化

对锻压模具型腔NURBS曲面数控加工刀具的路径进行优化。介绍了刀具路径的优化处理过程,运用Pro/E软件对汽车传动件锻压模具曲面进行造型,应用Cimatron E11软件进行数控加工编程。后置处理后生成更合理的加工程序,提高了复杂曲面零件加工的表面质量,为复杂曲面类零件的数控加工提供参考。     

复杂曲面模具加工系统综合刚度场建模与分析*

在加工汽车覆盖件模具复杂曲面时,机床-刀具刚度、刀具位姿变化、模具型面变化都会影响加工系统综合刚度,进而影响模具加工精度。以四轴数控加工中心为例,针对模具曲面特征设置相应采样点,依据多体小变形理论,通过点传递矩阵、雅可比矩阵等完成该采样点的加工系统综合刚度建模,并引入了力椭球。在刀具不同的空间姿态下,通过力椭球分析了机床横梁、刀柄、刀具、模具曲面特征等对加工系统综合刚度性能的影响,揭示了曲面模具加工系统综合刚度的分布规律。最后通过试验证明,该理论模型可以有效地优化复杂型面模具加工工艺,减小模具的加工误差。     

Modeling and simulation of high-speed milling centers dynamics

High-speed machining is a milling operation in industrial production of aeronautic parts, molds, and dies. The parts production is being reduced because of the slowing down of the machining resulting from the tool path discontinuity machining strategy. In this article, we propose a simulation tool of the machine dynamic behavior, in complex parts machining. For doing this, analytic models have been developed expressing the cutting tool feed rate. Afterwards, a simulation method, based on numerical calculation tools, has been structured. In order to validate our approach, we have compared the simulation results with the experimental ones for the same examples.     

基于车铣复合加工技术的微细丝杠切削研究

车铣复合加工技术能实现以铣代车或磨高速切削回转体零件。基于此技术的微细切削无论是在生产率还是在加工表面质量上,较其它加工技术而言,更适合于微细轴类零件和具有复杂型面的微小型零件的加工。通过微细车铣切削微细丝杠试验,从切削用量和加工质量及刀具磨损方面研究了车铣复合加工技术在解决微细丝杠加工中的应用。结果表明,基于车铣复合加工技术能够实现微细丝杠的高速切削。该技术非常适合于微细丝杠零件加工。     

基于声表面波原理的切削力测量智能刀具研究

切削力的测量对于监测加工过程以及获得高精度的零部件具有重要作用,为实现自适应加工提供切削状态参数。研究了一种基于声表面波原理的切削力测量智能刀具。能在切削加工中实现主切削力的实时测量,并具有无线、无源的测量优势,能够适应复杂的加工环境。建立了切削力与声表面波谐振器石英基片应变的关系模型,分析了声表面波谐振器谐振频率,得到了切削力与声表面波谐振频率偏移量的关系。实验结果表明,基于声表面波原理的切削力测量智能刀具能够实现切削力的实时测量。     

Machining of Titanium Alloy (Ti-6Al-4V)—Theory to Application

This article correlates laboratory-based understanding in machining of titanium alloys with the industry based outputs and finds possible solutions to improve machining efficiency of titanium alloy Ti-6Al-4V. The machining outputs are explained based on different aspects of chip formation mechanism and practical issues faced by industries during titanium machining. This study also analyzed and linked the methods that effectively improve the machinability of titanium alloys. It is found that the deformation mechanism during machining of titanium alloys is complex and causes basic challenges, such as sawtooth chips, high temperature, high stress on cutting tool, high tool wear and undercut parts. These challenges are correlated and affected by each other. Sawtooth chips cause variation in cutting forces which results in high cyclic stress on cutting tools. On the other hand, low thermal conductivity of titanium alloy causes high temperature. These cause a favorable environment for high tool wear. Thus, improvements in machining titanium alloy depend mainly on overcoming the complexities associated with the inherent properties of this alloy. Vibration analysis kit, high pressure coolant, cryogenic cooling, thermally enhanced machining, hybrid machining and, use of high conductive cutting tool and tool holders improve the machinability of titanium alloy.