CO_2激光切割系统中防反射技术的研究

在CO2激光切割铝、铜等有色金属过程中,经常发生工件反射现象。为防止在激光切割系统中由于光束反射导致的不稳定和损坏,光路系统中必须设计防反射装置进行隔离。本文从理论上阐述了该装置的设计原理、结构形式以及安装方法。     

2010年美国焊接展最新产品

Hypertherm公司推出了HyIntersity纤维激光装置HFL015。这是公司首次推出的一套一体式激光切割装备,包括电源、界面控制台、切割头、软件、供气和运动控制器。该1.5kW的装置的切割能力为切割低碳钢达到1/2in.(12.4mm),切割不锈钢达到3/8in.(9.5mm)。纤维激光系统较之CO_2激光系统,焊垫更小,因此纤维激光装置可整合为台子大小的切割装置,因为它没有像CO_2激光装置那样对大小的要求。该系统经过三年时间得以完善。     

气焊及切割工艺与设备

在黑色冶金业果用现代气体切割设备的经验;获得气体火焰加工金属用氢-氧火焰的电解装置;提高氢-氧火焰的热效率;等离子弧切割8mm厚以下薄板的精密系统;用龙门装置激光切割厚板;在同一机器上进行管子和板材的激光切割;激光切割工序集成保证了其在市场的优越性。     

气焊及切割工艺与设备

在黑色冶金业果用现代气体切割设备的经验;获得气体火焰加工金属用氢-氧火焰的电解装置;提高氢-氧火焰的热效率;等离子弧切割8mm厚以下薄板的精密系统;用龙门装置激光切割厚板;在同一机器上进行管子和板材的激光切割;激光切割工序集成保证了其在市场的优越性。     

激光切割加工中CAPP系统的设计与研究

介绍了一种激光切割加工中CAPP系统工艺数据库设计与开发，该系统可以提供激光切割加工的各种加工方法和工艺参数的选择，实现激光切割工艺标准化，并为智能化工艺设计提供了基础。     

三维光纤激光切割机器人的介绍及应用

三维激光切割是利用工业机器人灵活和快速的动作性能,根据切割加工工件尺寸的大小不同,可以选择将机器人进行正装或者倒装对不同产品、不同轨迹进行示教编程或离线编程,机器人的第六轴装载光纤激光切割头对不规则工件进行三维切割;光纤激光切割头上配备随动装置和光路传输装置,利用光纤将激光传输到切割头上,再利用聚焦系统进行聚焦,针对不同厚度的板材开发出多套聚焦系统对多种三维金属板材进行多方位的切割,满足生产的需求。     

一种激光净料切割生产线

设计了一种激光净料切割生产线,它是集成了卷料开卷整平送料装置、激光切割装置、出料输送装置的自动化生产线设备。通过采用卷料钢板作为原材料,进行连续的生产,实现净料加工,提高了材料利用率,节省了人工成本,具有全自动化生产的能力。     

全自动太阳能残片激光划片机系统设计

为实现对太阳能电池片残片的再次利用,针对现有激光划片机对太阳能电池片残片切割效率低、无法大批量加工等问题,设计了一种全自动太阳能残片激光划片机。该设计通过视觉检测系统获取残片的切割路径,由工控机、运动控制卡和PLC控制,实现残片的自动上下料、切割工作台移动以及激光切割功能。通过理论分析和实验研究,证明该设备的残片切割精度和效率能够满足设计要求,可实际应用在太阳能电池片残片再次利用的现代化生产中,具有降低能耗、环境保护的意义。     

计算机辅助钣金激光切割的研究

本文探讨了钣金激光切割的工艺特点，研究了计算机辅助钣金激光切割中零件图的设计输入、优化排料、自动数控编程及加工仿真等基本内容，并开发了一个基于统一数据结构的实用型钣金激光切割ＣＡＤ／ＣＡＭ软件系统。     

激光切割在变型车开发中的应用

叙述了采用激光切割工艺实现制件改制的工艺设计思路,通过激光切割与冲压工艺经济合理性的对比分析,确定了激光切割加工工艺在变型车开发中应用的可行性,并从生产工艺设计规划、激光切割定位工装的设计要点2个方面进行了详细介绍。     

Three-dimensional cutting process analysis with different cutting velocities

This paper uses the large deformation large strain finite-element theory, the updated Lagrangian formulation and the incremental theory approach to develop a 3D elastic-plastic analytical model that examines metal cutting on the tool tip and twin nodes on the machined face. The geometric position and the critical value of strain energy density, combined with twin node treatment, are also introduced to serve as the continuous chip separation criterion.

Finally, the 3D low-velocity cutting condition of mild steel was explored to analyze changes in the appearances of the workpiece and the chip, the distribution of stress and strain, and the progress of changes in the cutting force. The impact of different cutting velocities and the initial conditions of the residual stress were studied to understand the impact of various cutting conditions on the machined workpiece. The numerical average cutting forces are compared with the experimental cutting forces with the different low-cutting velocities to verify that the 3D cutting model that has been developed is reasonable.     

Modelling of dynamic cutting coefficients in three-dimensional cutting

A new theory to determine the dynamic cutting coefficients from steady state cutting data for three dimensional cutting has been developed. It is based on direct measurements of cutting forces, without any hypothesis relating to the steady state cutting. The experimental results show fairly good coincidence with the theoretical prediction of the stability limit.     

陶瓷刀具在干切削加工中的应用

文章论述了陶瓷刀具的特点和切削性能,对陶瓷刀具在干切削中的使用进行了分析.     

Identification of the specific cutting force for geometrically defined cutting edges and varying cutting conditions

Cutting force modeling is a major discipline in the research of cutting processes. The exact prediction of cutting forces is crucial for process characterization and optimization. Semi-empirical and mechanistic force models have been established, but the identification of the specific cutting force for a pair of tool and workpiece material is still challenging. Existing approaches are depending on geometrical idealizations and on an extensive calibration process, which make practical and industrial application difficult. For nonstandard tools and five axis kinematics there does not exist a reasonable solution for the identification problem.In this paper a co-operative force model for the identification of the specific cutting forces and prediction of integral forces is presented. The model is coupled bidirectionally with a multi-dexel based material removal model that provides geometrical contact zone information. The nonlinear specific forces are modeled as polynomials of uncut chip thickness. The presented force model is not subjected to principal restrictions on tool shape or kinematics, the specific force and phase shift are identified with help of least square minimization. The benefit of this technique is that no special calibration experiments are needed anymore, which qualifies the method to determine the specific forces simultaneously during the machining process. In this paper, experiments with different cutting conditions are analyzed and systematically rated. Finally, the method is validated by experiments using different cutting conditions.     

The effect of vibration cutting on minimum cutting thickness

In the ultra-precision diamond cutting process, the rake angle of the tool becomes negative because the edge radius of a tool is considerably larger compared to the sub-micrometer depth of the cut. The effects of plowing due to the large negative rake angle result in an unstable cutting process without continuous chip. For this reason, it is important to determine minimum cutting thickness in order to enable greater machining accuracy to be obtained by fine and stable machining. It was previously reported that the critical depth of cut with a continuous chip was determined by the tool sharpness and the friction coefficient between a workpiece and a tool [S.M. Son, et al., Effects of the friction coefficient on the minimum cutting thickness in micro cutting, International Journal of Machine Tools and Manufacture 45 (2005) 529–535]. For the same edge radius of a tool, the higher the friction coefficient of the tool–workpiece, the thinner the minimum cutting thickness becomes. Therefore, it is believed that increasing the friction coefficient by a physical method would be effective to achieve thinner stable cutting. In this study, the possibility of reducing the minimum cutting thickness was investigated through changing the friction coefficient of a tool–workpiece. The vibration cutting method is applied to increase the friction coefficient. Experimental results show that the cutting technology is efficient for increasing the friction coefficient and decreasing the minimum cutting thickness. The minimum cutting thickness was reduced by about 0.02–0.04 μm depending on materials and vibration conditions.     

切削温度与切削力综合测量的虚拟仪器

介绍了综合测量切削平均温度和三向切削力并对其进行分析处理的虚拟仪器。利用PCI－1200卡采集热电偶测温仪和电阻应变式测力仪传输的数据。利用Lab VIEW平台开发。具有显示力和温度波形曲线、热电偶标定和测力仪刻度标定、确定切削温度和切削力指数公式的能力。提出了基于切削力和切削温度信息的切削状态判定方法。     

自动切管机切割路径的运动学分析

切管机是管材加工及应用行业的专用加工设备,管材的管-板相贯的几何特点给切割一次成形带来了很大的困难,基于一次成形的考虑,提出了管-板相贯求交的一个通用算法,根据这一算法设计的数控切管机成功地实现了这类坡口一次数控切割成形,并通过一个较为典型的例子作一详细的论述.     

提高数控火焰切割机切割质量

对影响数控火焰切割机切割质量的因素进行了分析'针对不同的因素提出了解决问题的办法.同时对不同板厚、带孔零件、细长件的切割质量的控制提供了具体的解决方法.