超细长钛合金梁的数控加工工艺

通过对典型梁类零件超细长钛合金梁的加工实践,得到了一系列针对该类零件的数控加工工艺方法。试验表明,加工刀具的选择,切削参数的设定,定位方法、装夹方式、加工方式等都是零件成功加工的关键技术条件。     

B型钛合金细长轴套的加工工艺分析

针对细长轴类零件和钛合金的加工难点及特性,从工作实践中总结了自车削加工到磨削的工艺过程,提出了切实可行的工艺方案,完成了一种细长轴套的钛合金零件加工。     

某项目吊挂梁工艺性分析与工艺流程设计

针对梁类零件典型结构,分析论述其工艺性与加工方案;根据TC4材料独有特点,选取参数合理的刀具;阐述加工过程中具体实施过程,总结并提炼指导性工艺资料,加工出合格的产品证明加工方案的正确性,对类似梁类零件具有很大参考价值。     

位移传感器中细长轴车削加工工艺

轴类零件在机械零件中应用最为广泛,其加工工艺、加工质量对零件有较大的影响。本文以位移传感器中细长轴车削加工为例,从传统加工工艺、零件装夹方式入手,对细长轴受力、刀具角度刃磨与精确定位等方面进行解析,并采取相应措施,成功解决了细长轴在车削加工过程中易折断或变形的难题。     

汽车细长传动轴类零件的加工工艺

本文针对汽车细长传动轴类零件的加工，讨论了此类零件在加工工艺方案、工艺方案经济技术性、工装配置、刀具选择、设备选型及加工生产线布置等方面的共性问题，并在一个实际零件的加工中得到了应用，取得了良好的效果。     

高精度细长轴的中心孔加工工艺

在汽车产品加工中有很多轴类零件,如曲轴、凸轮轴、平衡轴及其他传动轴等。这些零件的结构细长、几何形状不完全对称。尺寸公差、形状公差、位置公差及轮廓精度、平衡精度要求很高。高精度细长轴类零件的制造加工工艺不断应用新技术、改进工艺措施。在整个轴类零件加工中,中心孔的加工是轴类零件加工的工艺基准一精基准,是其它工序精度加工的一个基本保障。     

不锈钢材料细长轴的加工工艺分析

在生活中不锈钢材料的轴类零件应用非常广泛,并且加工性能较差,细长轴加工是车工加工中最难保证精度的加工种类,进一步增加了切削难度,对于普通车床来说,加工不锈钢材料的细长轴,需要合理的加工工艺才能完成。通过多次试验,总结一种加工工艺方案。     

常规五金细长轴类零件的加工工艺及装备

五金细长轴类零件加工工艺方法和装备很多,本文简单介绍走芯机等装备的加工工艺,有效解决了细长轴类零件的弯曲变形,且质量稳定,提高了生产效率。     

模锻长梁大间距耳片孔同轴度的控制

梁类零件是飞机上非常重要的受力件和结构件。薄壁深腔结构的双面模锻长梁由于其特殊的材料及结构,加工难度非常大。着重论述了在加工模锻长梁类零件时,如何通过合理有效的工艺方案来控制零件变形,以及如何加工大间距耳片孔,以控制其同轴度,确保零件质量。     

TC21钛合金转轴梁高效加工工艺研究及应用

结合TC21钛合金转轴梁零件的加工技术需求,综合分析其加工特性、转轴梁典型特征的加工特点及生产现状,提出基于立卧转换实现转轴梁翼盒段的高效铣削加工工艺方案、装夹方式及高效加工策略,同时设计转轴梁类零件在立卧转换机床上的定位夹具,并对快进给铣刀的高效粗加工技术、闭角深槽腔五轴联动高效铣削技术以及自由曲面超弦精加工高效铣削技术进行系统研究。在此基础上实现转轴梁类零件在立卧转换机床上的高效加工及工程化应用,提高了零件加工效率和产品质量,降低了钳工操作者的劳动强度。     

基于ANSYS的定梁龙门机床横梁静力学特性分析及结构优化

横梁是龙门机床的主要承力部件,其结构和静、动态力学特性直接影响机床的加工精度。为分析其结构设计是否满足机床的精度要求,以及筋板结构和布局形式对其静态特性的影响,文中应用有限元分析方法,针对某型定梁龙门机床横梁进行静力学特性分析,计算了其最大静变形和最大静应力,分析了结构设计上的薄弱环节,然后对其内部筋板的结构和布局形式进行了优化设计和分析对比。结果表明,优化后横梁的静刚度提高了12.89%,最大静应力降低了18.01%,显著改善了横梁的静力学特性。     

利用CAXA对导风罩的五轴数控加工

重点介绍五轴机床的结构和数控加工。通过分析五轴机床的结构,运用CAXA建立HERMLE C30五轴机床的后处理。结合零件重点介绍了CAXA的三维模型功能和五轴加工功能,目的在于体现CAXA的三维模型功能和五轴加工功能在实际加工中的应用。     

小型精密机床横梁的设计与优化

精密机床是精密加工的基础,其振动不可避免的会影响加工精度。小型精密机床工作时的激振频率很高,通常远高于机床的固有频率,因此龙门式机床横梁的动态性能至关重要。运用Workbench对横梁进行有限元分析,根据分析结果,建立优化模型,以降低横梁质量,提高横梁固有频率为目标进行优化设计,避开了激振频率,最终得到优化方案。     

倒置式加工系统

倒置式加工是近年来出现的一种加工形式.它简化了机床配置和结构,有利于冷却液和切屑的排出,易于保证加工精度.介绍了三种典型的倒置式加工系统:立式车削加工中心、卧式镗铣加工中心和柔性制造系统以及应用案例.     

第十届中国国际机床展览会特种加工机床评述

通过对第十届中国国际机床展览会（CIMT2 007）展出的特种加工机床展品的评述,分析了国内外电火花加工机床、快速成形设备、激光加工机床等新技术、新工艺、新产品的技术特点、发展趋势及市场动态。     

Analysis of the machining stability of a milling machine considering the effect of machine frame structure and spindle bearings: experimental and finite element approaches

Chatter vibration has been a troublesome problem for a machine tool toward the high precision and high-speed machining. Essentially, the machining performance is determined by the dynamic characteristics of the machine tool structure and dynamics of cutting process of spindle tool. Prediction of the dynamic behavior at spindle tool tip is therefore of importance for assessing the machining stability of a machine tool at design stage. This study was aimed to evaluate the machining stability of a vertical milling system under the interactive influence of the spindle unit and the machine frame structure. To this end, a realistic finite element model of a vertical milling tool was generated by incorporating the spindle-bearing model into the head stock mounted on machine frame. The influences of the dynamics of spindle-bearing system and the machine frame structure were investigated respectively. Current results show that the machine tool spindle system demonstrates different dynamic behaviors at different frequency ranges, which are also characterized as structural modes and spindle modes, respectively. In particular, the maximum compliance of spindle tool tip was found to occur at the bending vibrations of spindle shaft and vary with the preload amount of spindle bearing. The machining stabilities were predicted to different extent, depending on the exciting modes which could be related to the influences of machine frame and spindle unit.     

Process parameter definition with respect to the behaviour of complex kinematic machine tools

The definition of machining processes with respect to complex kinematic machine tool behaviour involves the control of machine accuracy and kinematic performances. The aim is to propose process settings and tool paths which guarantee the required machining quality while maximizing productivity. This article presents an experimental protocol which enables the determination of machine tool structure behaviours which have an influence on machining quality. In parallel, an experimental analysis of the different kinds of settings which can improve machining quality is carried out. Two kinds of settings appear: the first class of settings improves machining quality or machining time, and the second class has an antagonistic influence on machining quality and machining time. Thus, the definition of the second class of settings arises from an optimisation between first-order defects, second-order defects and machining time. The developed method is illustrated on a parallel kinematic machine tool, the Tripteor X7. Note that this study is a first step towards controlling machine tool behaviour during machining.     

Fabrication of various shaped tungsten micro pin arrays using micro carving technology

This paper describes a state of the art in micro-structuring high strength metallic materials. Tungsten micro pin arrays in a variety of shapes are fabricated using a micro carving technology, which combines laser beam machining and electrochemical etching processes. First, micro pin arrays were rough-shaped by laser beam machining along a pre-defined scanning path to control their structural shape. The micro pin array in this stage had near-conical shape of structures due to a recast layer. Next, the genuine shape of micro pin arrays came to the surface via electrochemical etching process to elute the recast layer into electrolyte. Quantitative elemental analysis with energy-dispersive spectroscopy (EDS) was implemented to characterize the formation of recast layer on a micro pin structure after the laser beam machining process. The atomic percentage EDS maps indicated that higher percentage of tungsten was detected on the core micro pin structure, whereas relatively large percentage of oxygen was found on the recast layer (O 9%, W 91% in the center area, and O 53%, W 47% in the outer area).     

高精度细长台阶轴加工技术

简要介绍了加工高精度细长台阶轴的特点以及出现的问题,并阐述了通过在车床上增加辅助装置（不破坏车床任何结构及精度）实现对被加工零件的装夹、选择合理的刀具几何参数及不同加工条件下的切削用量,以满足高精度细长台阶轴的加工要求,并通过加工实例来进行分析。     

枪铰气缸盖气门导管孔及座圈孔DKM009组合机床在实践中的应用

阐述了用数控组合机床枪铰气缸盖组件的气门导管孔及座圈孔的工艺方案,并对机床关键部件的结构及功能做了介绍。该机床的设计及应用,解决了气缸盖加工中的关键工序气门座圈面及导管孔的加工精度问题。