对加工中心自动换刀装置换刀时间的探讨

文章简单介绍了ATC结构以及目前市场上ATC换刀时间的不一致局面,对现有加工中心ATC换刀时间的评定方法做了综合论述,适应ATC的模块化趋势,提出给出ATC独立换刀时间以及刀对刀时间结合切削对切削、辅助位置对位置的换刀时间评定办法.     

自动换刀装置

自动换刀方法在车削加工中早已使用了,采用分度转塔作依次换刀的方式。但是由于自动控制的发展,操作者必须以规定的速度进行操作,为了避免动作不协调,常常代之以自动换刀装置,以便在规定的速度下,自动地、准确无误地实行换刀。这种办法现在用得很多。尤其是,随着加工中心机床的出现,发展了带刀具库的大型自动换刀装置。 1.自动换刀装置的功能和概要 自动换刀装置一般说来具有以下的功能:     

数控编程中有关换刀问题的探讨

主要探讨了不同系统、不用类型的数控机床的刀具机能，换刀点的选取以及换刀格式的书写，并指出不同的机床其程序格式不一定相同，所以不论手工编程还是自动编程都必须严格按机床要求的格式进行编写。     

基于PLC的刀库自动选刀应用与开发

在机械加工行业里,由于数控机床有许多优点,已逐渐代替普通车床成为主导机床.按工艺用途它可以分为一般数控机床和数控加工中心两大类,而后者因带有由刀库和机械手组成的自动换刀装置,能使工件在一次装夹中完成大部分甚至全部工序.根据数控系统选刀指令,从刀库中将所需要的刀具转到取刀位置,称为自动选刀.自动选刀方式可分为随机与顺序选择两种.文章着重讨论基于三菱FX2N系列的PLC上的ATC刀库随机选刀方式的控制.     

圆盘式刀库加工中心随机换刀系统的研究

针对随机换刀的盘式刀库加工中心,阐述其换刀系统原理。提出一种结合宏程序、PMC程序和参数设置来实现自动换刀的控制方法,解决大直径刀具的换刀问题。该方法已在VMCL1000加工中心上调试成功。     

加工中心机床减少了辅助时间

近来,制造厂在介绍新型的加工中心机床时,除了强调其机床精度、结构刚度和高的切削效能外,而且还夸称具有能减少辅助时间的许多特点。这些特点包括多轴头换刀机构,数控调整刀具和快速上料的工件交换台等。加工中心机床在巴黎所进行的表演证明,刀具数量由于孔和螺纹直径等选用了优先数例而大为减少。而特种的多能刀具如数控镗头足以代替大量的予调刀具。     

加工中心自动换刀程序的设计与调试

简述了加工中心的数控系统组成和自动换刀过程,依据自动换刀过程要求,利用数控系统内置PLC设计了自动换刀程序,并通过触摸屏的画面配合完成了动作调试。实际使用证明,该自动换刀系统提高了机床的可靠性和生产效率。     

成组刀具的自动更换装置

本文一般应用于多轴机床,特别适用于具有自动转换器实现整套换刀的多轴机床。本文详细介绍多轴机床的自动化换刀以及主轴装备自动化松开与夹紧的装置。 文中所介绍的换刀机构,能使多轴机床的各轴与刀具库之间实现成组刀具的更换。在刀具库的许多组刀具之中所预选的那一组能同时和主轴上的刀具作自动成组互换。这种多轴刀具转换器还能将所选刀具分别夹紧在各旋转轴中。 文中所介绍的主轴自动定位及自动松开与夹紧装置,能使各主轴稳定地保持在预选位置,以配合多轴刀具转换器的应用。由于采用了成组刀具的自动更换装置,多轴机床大大地提高了实际加工的应用范围及效率。     

数控加工中心ATC弧面分度凸轮运动学问题研究

推导了弧面凸轮压力角和诱导主曲率的计算公式，对数控加工中心凸轮式自动换刀机械手(ATC)弧面分度凸轮的压力角和曲率进行了详细的分析，为ATC的优化设计和研究提供了理论基础，有助于ATC机构产品系列化的完成。     

加工中心换刀方式的选择

随着加工中心向高精度,高速度方向发展,加工中心中刀具交换的速度和准确性已成为一项评价其性能的重要指标.如何更好地选择换刀机构和换刀方法就尤为重要.下面就刀库、机械手及换刀方法的选择做一些简单介绍.     

对加工中心托盘自动交换装置及其编程的分析探讨

本文对托盘自动交换装置APC的组成和工作过程进行了研究．对其工作原理和具体编程方法进行了探讨。     

Research on Wear Behavior of ATC Cermet Material

THE PROGRESS of MODERN cutting tools R/D is onrequest of industrial demand,including the propertiesoptimization of tool material,improvement of toolreliability during cutting process and capabilitiesrequirement of dry cutting aimed at cleanmanufacturing.Ceramics,due to their excellentproperties,such as good wear and corrosion resistance,high melting point,high hardness,antioxidationbehavior at high temperature,etc.,have been widelyused in many fields**.For example,in cutting highhardnes…     

Automated task planning for industrial robots and laser scanners for remote laser beam welding and cutting

Remote laser beam welding and cutting can be applied to a wide range of applications within the manufacturing technology domain. With high process rates, consistent high quality welding seams and cutting edges at various contours these technologies offer an increased flexibility to process a wide variety of work pieces. To take advantage of the process the laser beam must be positioned precisely on the work piece. Programming a system of an industrial robot combined with a laser beam deflecting scanner manually is a very time consuming job. Programming any “on the fly” movements, a synchronously movement of the scanner and the robot, is even more difficult. This paper describes challenges and a concept for the automated programming of the two devices to apply the advantages of remote laser beam welding and cutting.     

GO法在数控机床可靠性研究中的应用

传统可靠性分析方法侧重于系统静态结构的描述,难以反映系统的动态运行过程。将一种新的可靠性分析方法———GO法引入到数控机床可靠性研究中,阐述了GO法分析的具体步骤,建立了数控机床刀具交换系统的GO图模型,基于GO法状态概率公式对刀具交换系统进行了精确的定量分析和定向分析,给出了系统中共有信号的修正算法,验证了GO法在数控机床可靠性评价分析中的可用性与正确性。最后,通过对几种方法特点的比较,阐明了GO法的特点和优势。     

The influence of powder characteristics on mechanical properties of Al2O3–TiC–Co ceramic materials prepared by Co‐coated Al2O3/TiC powders

Ultrafine Al₂O₃–TiC–Co (ATC) ceramic is prepared in order to improve the bending strength and fracture toughness of ceramic materials. The ultrafine Co‐coated Al₂O₃ and TiC powders have been synthesized by electroless plating at room temperature, and the composite powders were sintered by hot‐pressing to compact ATC samples. The average bending strength, average hardness and average fracture toughness values of ATC ceramic with different particle sizes and Co contents were investigated. The toughening mechanism of the ultrafine ATC ceramic was studied by transmission electron microscopy (TEM) and ceramic performance testing methods. The results show that the relative density, bending strength and fracture toughness values increase remarkably with the increase of Co content. The ultrafine grain of original powders is beneficial to improve the relative density, strength and toughness values of ATC ceramic. The Co phase hinders the growth of ATC ceramic grains during sintering. The Co phase forms a three‐dimensional mesh skeleton structure during sintering, improving the fracture toughness and strength of the composite ceramic.     

一种新型陶瓷的冲蚀磨损耐磨性

对ＴｉＣ及Ａｌ２Ｏ３粉末进行表面改性，在其表面均匀包覆一层钴膜，然后再用热等静压制备出硬度和韧性较较理想的Ａｌ２Ｏ３－ＴｉＣ－Ｃｏ新型金属陶瓷，该材料的断裂韧性比未改性的ＡＴ３０材料有较大的提高，硬度两者相当，并对ＡＴ３０和ＡＴＣ材料的冲蚀行为及冲蚀机制进行了比较研究，研究表明，无论在高角还是在底角冲蚀条件下，其抗冲蚀性能优于Ａｌ２Ｏ３－ＴｉＣ陶瓷，尤其是在高角冲蚀条件下。     

Design of an automatic tool changer with disc magazine for a CNC horizontal machining center

Automatic tool changers (ATCs) are devices used in CNC machine tools to exchange the tool in the spindle with the tool in the magazine. In this paper, the design of the ATC of a CNC horizontal machining center which was realized for a CNC machine tool manufacturer is introduced. After examination of several alternatives, it was decided to implement the disc-type ATC. A magazine was designed with 24 tools with a maximum tool diameter of 150 mm and a maximum tool weight of 8 kgf. The designed ATC can change the closest tool within 4 s and the tool farthest away within 6 s.     

铝合金填充丝TIG焊过程质量数据库

建立了铝合金填充丝TIG焊监测系统,详细介绍了过程质量数据库,采用LabVIEW和Access相结合编程,实现了对焊接工艺参数和坡口几何信息的记录,并且采用多变量统计过程控制(MSPC)中的主元分析(PCA)和统计控制图对数据进行分析和特征值的提取,实现了对焊接过程的质量分析.     

Mechanical Properties and Thermal Shock Resistance of Al2O3-TiC-Co Composites

Ductile cobalt was introduced into Al₂O₃-TiC (AT) composites by using a chemical deposition method to improve toughness and resistance to thermal shock. The mixture of Co-coated Al₂O₃ and TiC powders was hot-pressed into an Al₂O₃-TiC-Co (ATC) composite. The flexure strength and fracture toughness of the ATC composites have been improved considerably, compared with AT and Al₂O₃. The fracture surface of ATC shows a large proportion of transgranular cracks with some intergranular type, unlike the intergranular fracture modes of AT and Al₂O₃. The thermal shock properties of the composites were evaluated by water quenching technique and compared with the traditional AT and Al₂O₃. The composites containing only 3.96 vol.% cobalt exhibited higher critical temperature difference and retained flexure strength. The SEM examination of the fracture surfaces of the ATC composites after single thermal cycle showed that voids increased in number and size, and most isolated voids coalesced with increasing temperature difference, which caused the density and strength to decrease. The ATC composite is less sensitive to repeated thermal shock than the AT composite.