数控火焰切割机切割质量的影响因素及切割工艺探讨

数控火焰切割机目前被广泛应用在矿山机械、桥梁建筑、船舶建造、钢结构等行业上,其加工厚度大、加工的成本低。在实际操作数控火焰切割机进行切割加工时,切割过的钢板表面会出现一些缺陷,如:表面粗糙、边缘塌陷、形成裂纹等。针对这些情况,本文对数控火焰切割机的切割质量影响因素及切割工艺进行了探讨。     

基于CATIA的五轴水切割后置处理开发

针对CATIA数控加工的刀位文件,通过分析通用后置处理程序过程,开发五轴联动水切割机床的后置处理程序,解决五轴水切割数控加工的自动编程问题。实际切割结果证明,开发的后置处理程序能够正确将CATIA软件生成的APT刀位数据转换成五坐标水切割数控加工程序。     

石油勘探管激光切割研制

利用现有二维PLATINO-2040型激光切割机,将数控激光切割技术应用到了新产品的开发在研究过程中,充分运用冲压、数控激光切割、机械制造等多方面专业知识,发挥数控激光切割加工高术度、高效率、高适应性的优势,结合冲压件中性层展开,螺旋加工以及相关配套专用夹具的辅助,进行了娄控激光切割。同时,对数控激光切割管类件的切割质量影响因素进行了研究。     

多管接头钣金展开下料CAD/CAM集成系统

介绍了一个多管接头饭金展开下科的CAD／CAM集成系统。软件系统采用面向制造工艺的计算模型，充分考虑了板厚、坡口角度及焊缝对钣金加工的影响。系统通过多文档多视的程序结构及三维造型技术，支持全过程设计，不仅可以生成各种多管接头构件的展开图、工程图、三维立体模型，还能生成备工备料的工艺清单、数控加工程序，进行数控切割仿真，数控切割机进行数控切割下科，实现了CAD／CAM集成。     

基于AutoCAD平台的二维零件数控切割自动编程

提出了一种由AutoCAD二维图形直接生成数控火焰切割机加工代码的方法通过提取零件图形轮廓几何数据,判断零件轮廓旋转方向和内外轮廓,确定切割顺序,自动生成数控加工代码.实验结果表明此方法可以有效提高数控切割效率.     

MCT8000运动控制卡在切割行业中的应用

介绍一种采用国产MCT8000F4伺服运动控制卡开发的新型数控切割机控制系统。该系统实现了氧切割和等离子切割两种形式，不仅具备加工中暂停、继续、沿原轨迹返回，调速和支持G代码等功能，且可以对加工图形进行镜向、旋转、无级缩放处理，以及在线实时调速和轨迹动态跟踪。可作为开发新一代数控切割控制系统的一种有效的解决方案。     

简易数控等离子切割装置的研究与实现

介绍一种简易数控等离子切割装置的总体方案设和圆弧插补算法,所研制的简易数控等离子切割装置,大大简实现对板材以及小型零件的切割加工.计、机械机构及控制系统的设计研究,该设计实现了直线化了市场上数控等离子切割装置机械结构和控制系统,可     

浅议我国数控激光切割技术的发展趋势

在我国数控激光切割技术应用过程中,技术人员应该根据加工系统的性能、加工材料和工艺参数进行分析,有效控制影响激光切割质量的因素。在数控激光技术应用活动中,根据不同的材料厚度和种类,选择合适的工艺参数,从而提高激光切割的加工质量。本文从数控激光切割技术的发展趋势进行分析,提出几点有利于增强激光行业发展效率的可行性建议。     

离心式通风机侧板的数控激光切割及控制程序设计

本文叙述了作者研制的用数控激光加工机床，切割离心式通风机侧板及控制程序设计原理。     

割缝筛管的激光切割

利用激光切割筛管的原理和割缝筛管数控激光加工机床，采用复合变位法和特殊的工艺方案解决了梯形缝和宽缝加工的技术难题，加工出了合格的割缝筛管。分析了激光切割筛管过程中常见的质量缺陷及产生的原因，并提出了工艺解决方案。     

方形管材直角对接自动焊装夹工艺研究

叙述了方形管材直角对接的焊接工艺要求与装夹方法,采用气动斜楔杠杆机构设计了方形管材直角对接的焊装夹具与对位装置,介绍了夹紧力的计算方法。     

管环相贯焊接坡口数控切割研究

在研究管环相贯数学模型的基础上，对管环相贯焊接坡口数控切割运动进行了研究。将切割运动分解为管的回转、割炬平移、割炬倾斜和割炬倾角旋转四轴运动，定义了建立数学模型所需参考平面，给出了数控切割时相贯线、局部两面角、割炬倾角和割炬倾角旋转角各参数的参量表达式。通过切割实例仿真，分析了切割运动与各参数的关系。     

Investigation of the effects of cooling in hard turning operations

As a means to overcome the limitations of cutting fluids in machining, more and more attention is being paid to the internal cooling of cutting tools. The elevated cutting zone temperature in hard turning causes the instant boiling of coolant in the cutting zone, which pulls down the tool life and surface finish, by making thermal distortions and hence in most of the hard turning operations, the coolant is not used at all. The absence of coolant also reduces the tool life and surface finish to some extent. As an alternative solution to the direct application of coolant in the metal cutting zone to improve tool life and surface finish, the heat pipe cooling system is introduced in this investigation. A parametric study is conducted to analyze the effects of different heat pipe parameters such as diameter of heat pipe, length of heat pipe, magnitude of vacuum in the heat pipe and material of heat pipe. All these parameters are varied to three levels. In this analysis, it is assumed that the single point cutting tool is subjected to static heating in the cutting zone which verifies the analysis and feasibility of using heat pipe cooling in turning operations. The heat pipe parameters are optimized by using Taguchi’s Design of Experiments and a confirmation test is conducted by employing the heat pipe fabricated with the best values of parameters. The results of the confirmation test are compared with the previous experimental results. The comparison shows that the use of a heat pipe in hard turning operations reduces the temperature field by about 5%, improves tool life by reducing tool wear and improves surface finish significantly. The result of this analysis is applicable to define controlling parameters of heat pipes for optimal design and set-up for various related studies. The finite element analysis also shows that the temperature drops greatly at the cutting zone and that the heat flow to the tool is effectively removed when a heat pipe is incorporated.     

管端相贯焊接坡口数控切割研究

根据空间解析几何的原理建立了管端相贯数学模型,用参量方程描述了管端相贯线焊接坡口的几何形状,该数学模型可应用于4轴联动火焰数控切管机.针对4轴联动火焰数控切管机,分析了管端相贯焊接坡口数控切割运动,将切割运动分解为割炬绕被切管的回转、沿管轴线的平移及在轴剖面内的倾斜、垂直于切割轨迹的4轴联动,给出了数控切割所需相贯线、两面角、实际切割角等参数的参量表达式.     

Investigation of dry machining with embedded heat pipe cooling by finite element analysis and experiments

This paper investigates the performance of a cutting tool embedded with a heat pipe on reducing cutting temperature and wear in machining. The temperature of a tool plays an important role in thermal distortion and the machined part’s dimensional accuracy, as well as the tool life in machining. A new embedded heat pipe technology has been developed to effectively remove the heat generated at the tool–chip interface in machining, thereby, reducing tool wear and prolonging tool life. In particular, the technique can effectively minimize pollution and contamination of the environment caused by cutting fluids, and the health problems of skin exposure and particulate inhalation in manufacturing. The ANSYS finite element analysis simulations show that the temperature near the cutting edge drops significantly with an embedded heat pipe during machining. Temperature measurements at several locations on the cutting tool insert agree with the simulation results both with and without the heat pipe. Experiments were carried out to characterize the temperature distributions when performing turning experiments using a cutting tool installed with an embedded heat pipe. The performance of the heat pipe on reducing the cutting tool temperature was further supported by the observations of cutting tool material color, chip color, and the chip radius of curvature.     

Investigation of heat partition in dry turning assisted by heat pipe cooling

Dissipation of the cutting heat through the cutting tool assisted by the heat pipe is a new cooling method in metal cutting. However, as an important indicator to evaluate the cooling performance, the heat partition in the cutting process for the heat pipe cutter has not been reported in the previous publications. This investigation is concerned with the estimation of the amount of heat flowing into the heat pipe cutter and that dissipated by the heat pipe. The aim is to characterize the heat partition of the heat pipe cutter and thus evaluate its cooling performance. Experimental results are presented of temperature measurements at the accessible positions on the cutter during orthogonal cutting. With these measured temperatures, the finite different methods and an inverse procedure are utilized to solve the heat flux loaded on the tool–chip interface and the amount of heat flowing into each part of the heat pipe cutter. It is shown that the installation of the heat pipe increases the heat flowing into the tool; however, much greater amount of heat can be dissipated by the heat pipe; this results in the reduction of the temperature at tool–chip interface.     

行星式数控无屑切管机的运动实现

提出了一种行星式数控无屑切管机的运动方案：通过计算分析,给出了机构的主运动和进给运动的传动参数;根据特定管材尺寸,给出了该切管机的基本参数。     

钢管切割机专利新产品传动系统结构分析

钢管切割机专利新产品采用行星运动原理来设计刀具的传动系统 ,可实现对各种不同钢径和壁厚钢管的切割 ,其结构新颖 ,操作方便 ,钢管切口平整 ,工作效率较高     

PLC在塑管自动切割控制系统中的应用

介绍了塑料管材自动行星切割的工作原理及PLC控制系统。在分析了管材自动切割的工作流程的基础上，给出了PLC控制系统的硬件和软件设计。在塑管生产线中，应用可编程控制器实现管材的定长切割和自动堆放，提高生产效率，增加系统可靠性和柔性。     

基于55°密封管螺纹的锥螺纹数控加工研究

通过对我国管螺纹现行标准、作用、工艺及功能特点的详细介绍,探讨了以数控加工的方式进行55°密封管螺纹的圆锥外螺纹的加工思路、工艺参数选择及程序编制。通过对55°密封管螺纹的数控加工工艺的研究发现,数控加工管螺纹不但可以提高加工精度及加工效率,而且在切削过程中选择适当的切削用量,可以较好地保证加工质量。