CO2 laser cutting of stained glass

This paper covers the CO₂ laser cutting of stained glass using a Ferranti MF400 CNC laser cutting machine. The report examines the various laser cutting parameters required to generate a cut surface in glass which will require minimal post-treatment to be carried out, and also investigates the degree of geometrical intricacy that can be attempted, together with the associated limitations, in cutting 2D glass components. The experimental procedure used to obtain the necessary information for a preliminary database on the laser cutting of stained glass is also detailed. Finally, the implications and applications of the investigative work are examined for commercial situations through construction of a simple 2D test artefact.Notation f pulse frequency (Hz) - k thermal conductivity (W/mK) - P laser beam power (W) - Pl pulse duration (10^–5 s) - Pr pulse ratio - Ps pulse separation (10^–5 s) - P shield gas pressure (bar) - R _a surface roughness (m) - t _s substrate thickness (mm) - V cutting speed (mm/min) - V _opt optimum cutting speed (mm/min) - w kcrf width (mm) - angle of deviation (deg.) - wavelength (m) - d perforation depth (mm)     

自动玻璃切割机排样优化算法设计与实现

介绍了在自动玻璃切割机中如何构建一种效率高、计算速度快和效果好的排样优化算法,使玻璃下料利用率得到较大幅度的提高.此外还对玻璃切割优化系统的基本原理进行了详细介绍,并给出了一个排样实例计算玻璃用量.     

High-efficiency and precision cutting of glass by selective laser-assisted milling

As a hard and brittle material, glass is difficult to precisely cut with high efficiency. Although various attempts at ductile cutting of glass with high cutting depth have been reported, the low efficiency of the cutting process remains problematic. In order to achieve high-efficiency and precision cutting of glass, this paper proposes selective laser-assisted milling (SLAM). In this method, a fiber laser that has a wavelength out of the absorption band of glass is absorbed only into the small area where the black-body coating is put, and the selectively heated area is removed with a cutting tool. The experimental results of this study have demonstrated that SLAM reduces the arithmetic average of the roughness profile by 74% compared with conventional cutting. An observational analysis of the generated chips revealed that the application of SLAM changed the morphology of the chips from the crack type to the quasi-continuous type. These results demonstrate the feasibility of the high-efficiency and precision cutting of glass.     

气门摇臂端面车削离心夹具

以气门摇臂端面车削为例，介绍一种利用离心力夹紧工件来加工端面的夹具设计原理及特点，对加工同类产品有借鉴推广价值。     

二维复杂曲线零件的线切割加工计算机辅助编程

电火花线切割机床加工复杂不规则曲线构成的二维零件,由于计算量较大,一般应使用自动编程软件进行计算机辅助编程。但在自动编程之前,须对手工绘制的零件图样进行前期的预处理,为此,介绍零件图样的前期预处理方法及其自动编程方法。     

数控剪切中心自动控制系统设计

通过介绍数控剪切中心的功能、自动控制总体设计原则,系统组成及特点,给出了数控剪切中心的总线拓扑框图及系统流程图。最终解决了我国汽车制造行业,超宽板料下料的技术及工艺难题。     

机械原理计算机动画辅助教学软件系统设计

介绍了笔者自行开发的机械原理计算机动画辅助教学软件系统,它将计算机动画技术引入到《机械原理》课程的教学中,变静为动,让全书的机构动起来,大大提高了教学效果。     

基于切削加工废物流的废弃物计算系统研究

绿色制造是碾代制造追求的目标,而减少或者消除制造系统中的废物流则是实现这一目标的基础之一。基于这一理念,计算出制造系统产生的废物量是非常重要。切削加工是制造系统的典型环节,本文阐述了切削加工过程中的废物流,并详细分析了切削加工过程中产生的废弃物的种类和与各主要废弃物产生量相关的主要因素。此外,还分析了废弃物计算系统的软件构架及实现机制。     

Influence of cutting conditions of cast-metal cutting tools on their wear and durability: Analysis of cutting conditions of tools

The conditions of operation of metal-cutting tools in various applications and of various standard dimensions are analyzed. Long-standing statistical observations at a number of industrial facilities have revealed the dominating mechanisms of wear and the main causes of failure of the tools have been established in response to the conditions of their operation and design features. A range of tools has been selected for comparative durability tests in industrial conditions.     

金属数控切削表面粗糙度分析

为了适应先进制造技术的要求,使数控高速切削加工技术在我国得到更为广泛的应用,满足加工企业和加工人员的需要,研究了几种主要金属材料在数控高速切削加工中的表面质量,通过试验对不同金属在不同高速切削条件下获得的表面粗糙度进行了重点研究和分析,以期为后续研究提供借鉴。     

玻璃管数控切割系统设计

介绍了玻璃管生产线中的玻璃管数控切割系统的结构及工作原理。数控系统的设计从控制刀盘旋转周期与拉管速度间的关系入手,实现保证玻璃管长度的目的。解决了玻璃管生产过程中,其切割过程无法适应拉管速度变化而引起玻璃管长度误差较大的问题。     

Dimethicone-aided laser cutting of solar rolled glass

Solar rolled glass, with one micro-structure surface and another roughness surface, can cause diffuse refraction of the focused laser spot, and this phenomenon restricts the application of laser manufacturing. In this study, laser cutting of solar rolled glass with a thickness of 2.5 mm was successfully achieved with the help of dimethicone to ensure laser focusing. Dimethicone was coated on the top surface of the rolled glass processing zone, and a Z bottom–up multilayer increment with the X–Y spiral line was applied to control the cutting path. Different viscosity values of dimethicone were considered. Results showed that surface quality increased as the viscosity increased until a certain threshold was reached; afterward, the surface quality decreased or directly caused the cutting to fail. The minimum surface roughness (3.26 µm) of the processed surface (chipping: Width≤113.64 µm, area 215199 µm²) was obtained when the dimethicone viscosity and laser pulse frequency were 1000 mm²/s and 43 kHz (power 25.4 W), respectively. The micro-defects on the processed surface were few, and the edge chipping width and depth of the laser processed surface were small.     

克林贝格锥齿轮的计算机模拟加工

克林贝格制 (Klingelnberg)锥齿轮除了具有一般螺旋锥齿轮的优点外 ,其加工是连续切削 ,生产效率高 ,齿面之间是鼓形齿接触 ,可以避免对角接触 ,是锥齿轮发展的主要方向之一。但加工过程中需要反复试切、修正才能满足要求。本文根据克林贝格锥齿轮加工中 ,齿轮、摇台和刀盘之间的相对运动关系 ,提出了利用计算机软件进行模拟加工的方法 ,使设计人员可以事先在计算机上全方位地观察到齿面的加工质量 ,大大降低加工成本     

计算机数控雕刻技术及其应用前景

介绍了计算机数控雕刻技术的特点、应用特色、应用领域,预言该技术的应用前景将十分广阔.     

铲齿成形铣刀的计算机辅助设计

讨论了铲齿成形铣刀设计中ＣＡＤ问题,介绍铲齿成形铣刀的计算机辅助设计过程。通过采用ＡｕｔｏＣＡＤ,利用内嵌ＡｕｔｏＬＩＳＰ语言,快速准确地实现了从参数输入,结构设计,廓形计算到自动输出刀具工作图的整个过程。     

新型平压模切机的设计

介绍了作者设计的模切机的工作原理、结构特性、几何参数,这种模切机是印刷、包装行业压制纸盒、纸箱等纸制品的专用设备,该模切机具有效率较高、结构简单的特点,可适用于各不同规模企业。     

基于数字图像的数控切绘机自动编程系统研究

研究了数控切绘机自动编程系统的关键技术,并给出了实现方法。该系统首先通过扫描获取样板的数字图像作为输入,然后利用数学形态学进行去除噪声,采用链码跟踪方法记录图像的边缘轮廓,最后使用分段拟合的方法将图像矢量化,从而根据矢量图生成数控代码。实验结果表明,该系统能根据样板的数字图像自动生成数控代码,效果良好。     

高速切削的关键技术与研究展望

高速切削加工是先进制造技术的重要组成部分之一.综述了高速切削的优点、发展应用和关键技术,分析了其发展背景.着重分析了高速切削机床、高速切削刀具和安全装置与监控系统.展望了该领域今后的研究方向.     

计算机辅助监控机床颤振的研究

本文主要讨论机床颤振的计算机辅助监控问题。文中提出以特征量ξ做为机床颤振的监测参数,当ξ值超过预先设定的控制门限值时,计算机监测单元即向控制单元发出警报并采用一种特殊的变速控制策略抑制颤振于孕育之中。