高速切削温度场测量技术研究现状

高速切削加工现已成为当代先进制造技术的重要组成部分.切削热与切削温度是高速切削技术研究的重要内容.采用合适的测量方法对高速切削条件下的温度场进行研究可以得到切削参数对切削温度的影响规律,从而为研究刀具磨损机理、优化切削参数提供了有益的参考数据.归纳了高速切削中切削温度实验测量方法的研究现状,指出了各种方法的优缺点及适用性.     

高速切削技术现状与展望

一、概述 迄今为止,切削加工仍是机械制造领域应用广泛的一种加工方法。集高效率、高精度和低成本于一身的高速切削加工技术的迅速崛起,正对机械制造业的发展产生着深远的影响。 高速切削加工概念首先是由德国的C.Salomon博士提出,并于1931年4月发表了著名的切削速度与切削温度的理论。该理论的核心是:在常规的切削速度范围内,切削温度随着切削速度的增大而提高,当到达某一速度极限后,切削温度随着切削速度的提高反而降低。此后,高速切削技术的发展     

高速切削TiAl6V4温度和切削力动态变化规律研究

切削温度和切削力是反映高速切削加工过程的两个重要物性指标,是高速切削研究的主要内容.本文基于实验验证的有限元数值模拟技术,系统研究了高速切削TiAl6V4过程中切削温度与切削力随切削速度的变化规律,揭示了其中的物理起源,并对Salomon假设的存在性进行了初步探索.研究结果表明,刀具与切屑接触区温度总是随着切削速度的增...     

高速切削温度场模拟仿真研究现状

切削热与切削温度是高速切削技术研究的重要内容.采用数值模拟仿真对高速切削条件下的温度场进行研究可得到切削参数对切削温度的影响规律,从而为研究刀具磨损机理、优化切削参数提供有益的参考数据.     

高速切削Ti6Al4V钛合金时切削温度的试验研究

应用硬质合金刀具对Ti6Al4V钛合金材料进行了高速车削和高速铣削试验,研究分析了干切削、空气射流及氮气射流条件下的切削温度变化情况。研究结果表明,氮气射流及空气射流条件下的切削温度明显低于干切削条件下的切削温度,而氮气射流条件下的钛合金高速切削温度则略低于空气射流条件下的切削温度。     

高速切削的关键技术及应用

高速切削技术已成为切削加工的主流和先进制造技术的一个重要发展方向。高速切削较之常规切削是一种创新的加工工艺和加工理念。分析了高速切削技术的特点．研究丁高速切削的关键技术：机床技术、刀具技术和工艺技术，介绍了高速切削技术在航空航天和汽车制造等领域的发展及应用。     

高速切削技术的发展及应用

高速切削技术已成为切削加工的主流和先进制造技术的一个重要发展方向。高速切削较之常规切削是一种创新的加工工艺和加工理念。分析了高速切削技术的特点，研究了高速切削的关键技术：机床技术、刀具技术和工艺技术，介绍了高速切削技术在航空航天和汽车制造等领域的发展及应用。     

高速切削过程测温方法综述

切削温度与加工精度和刀具磨损密切相关,高速切削过程中切削温度随着材料,刀具,切削用量的选择不同而呈现出与普通切削过程不同的变化规律.本文归纳了高速切削当中切削温度的测定方法,并指出了各种方法的优缺点及适用性.     

高速切削刀具的应用

高速切削的研究历史,可以追溯到20世纪30年代由德国Carl Salomon博士首次提出的有关高速切削的概念。Salomon博士的研究突破了传统切削理论对切削热的认识,认为切削热只是在传统切削速度范围内与切削速度呈单调增函数关系;而当切削速度突破一定限度以后,切削温度不再随切削速度的增加而增加,     

高速加工切削热产生机理及监控技术研究综述

在概括总结了高速加工主要特点的基础上，分析了高速加工切削热产生机理及目前的研究状况，构建了基于光学、软测量技术和网络通信的计算机刀具综合监控系统，重点从高速加工切削温度场建模和数字仿真、切削温度测量和实时监控等方面论述了切削热产生机理及监控技术的研究思路，最后指出了高速切削刀具种类和刀具参数的选择方法，以及高速切削虚拟仿真软件研制等方面存在的技术难点，这些工作为高速加工应用的基础理论研究提供了技术支撑。     

高速干式飞刀的切削温度模型

根据传热学和金属切削原理等,建立高速干式飞刀的切削温度模型,推导出多因素切削温度的计算公式,该模型的建立为进一步分析高速干式滚齿切削温度及切削机理奠定了基础。     

45钢高速切削过程中切屑形成的数值模拟

为了研究45钢高速加工中切屑形成机理,建立了高速加工的正交切削有限元模型,研究了45钢高速切削有限元建模过程中的Johnson-Cooks材料模型,刀屑接触模型及切屑分离准则等关键技术.利用建立的有限元模型对45钢的高速切削过程中的切屑成形进行了数值模拟,并研究了不同切削速度对切屑锯齿化程度的影响规律,得到了不同切削速度下的切屑锯齿化程度.     

Prediction of cutting temperature distributions on rake face of coated cutting tools

Coated cutting tools have been widely employed in metal cutting operations owing to its excellent abrasion resistance and heat transfer performances. Rake face temperature is the primary factor that determines the temperature distribution in the cutting tool body. Based on the heat source theory, a new prediction model is proposed in this paper to forecast the temperature distribution on the rake face. Infrared image is used to develop a new turning experimental apparatus to measure the rake face temperature of coated tool during the cutting process. Rake face temperature measurement results are used to verify the proposed model prediction results of temperature distribution. Several cutting tests are carried out with monolayer coated tools in the machining of H13 hardened steel. The rake face temperature in monolayer coated tool for machining H13 shows an increase trend as the cutting speed increases. The influence parameters including thermo-physical properties and tool/workpiece frictional coefficient of coating material on temperature distribution in coated tools are discussed and illustrated. The research results presented in this paper can help to access the potential of coated tools used in the hardened steel machining.     

Workpiece temperature rise during the cutting of AISI 4340 steel

Temperature rises in workpieces were measured during the cutting of various hardnesses of steel by a ceramic tool. Thermocouples were embedded in a specially designed workpiece for the temperature measurement. This workpiece provided practical and accurate positioning of the thermocouples and it allowed the acquisition of reliable data from the cutting experiments. The effects of the workpiece hardness and cutting speed were examined and analyzed. The relationships between the workpiece temperature rise and residual stresses or structural change in a machined surface layer were discussed.It is concluded that the temperature rise in a steel workpiece during cutting by a ceramic tool is so low that it is less likely to cause any surface damage under normal conditions.     

Influence of cutting speed on cutting force,flank temperature,and tool wear in end milling of Ti-6Al-4V alloy

Tool wear is one of the most important problems in cutting titanium alloys due to the high-cutting temperature and strong adhesion. Recently, the high-speed machining process has become a topic of great interest for titanium alloys, not only because it increases material removal rates, but also because it can positively influence the properties of finished workpiece. However, the process may result in the increase of cutting force and cutting temperature which will accelerate tool wear. In this paper, end milling experiments of Ti-6Al-4V alloy were conducted at high speeds using both uncoated and coated carbide tools. The obtained results show that the cutting force increases significantly at higher cutting speed whether the cutter is uncoated carbide or TiN/TiAlN physical vapor deposition (PVD)-coated carbide. For uncoated carbide tools, the mean flank temperature is almost constant at higher cutting speed, and no obvious abrasion wear or fatigue can be observed. However, for TiN/TiAlN PVD-coated carbide tools, the mean flank temperature always increases as the increase of cutting speed, and serious abrasion wear can be observed. In conclusion, the cutting performance of uncoated inserts is relatively better than TiN/TiAlN PVD-coated inserts at a higher cutting speed.     

金属切削过程中切削热和切削温度场的仿真分析

切削热的产生和由它导致的切削温度是影响金属切削状态的重要物理因素之一。笔者通过45#圆钢在几种不同切削速度下的温度场的仿真分析,直观的表现出切削速度对金属切削热的影响,从而对优化切削参数和研究刀具磨损机理提供方法依据。     

复杂雕塑曲面数控加工关键技术的研究进展

数控加工是复杂雕塑曲面高质量和高效率的加工方法，生成无干涉、无过切的、高效的刀具路径是复杂雕塑曲面数控加工的关键。这里综述了面向复杂雕塑曲面数控加工的关键技术和高速切削过程中传统CAM系统的不足，最后展望了复杂雕塑曲面数控加工关键技术的发展趋势。     

Measurement of temperature distribution in machining using IR photography

A review of various techniques employed in measuring cutting temperatures is presented and it is pointed out that the method of IR photography is certainly better than other techniques for the accurate measurement of the temperature distribution in the cutting region. The thermal sensitivity of high speed IR film has increased significantly in the past two decades. It is now possible to use IR photography for measuring cutting temperatures without preheating the workpiece and the cutting tool.Temperature measurements in the surface region of annealed 18% Ni maraging steel were made at cutting speeds of 80 and 160 ft min^?1. It was observed that the temperature is very high at the surface and decreases with depth beneath the surface. The cutting temperature increases with an increase in the wear land or dullness of the tool.     

An experimental investigation of the influence of cutting parameters on cutting temperature in milling Ti6Al4V by applying semi-artificial thermocouple

An investigation was reported on the cutting temperature in milling Ti6Al4V by applying semi-artificial thermocouple. ANOVA was conducted on the experimental results, and regression models were obtained. Analysis results showed that the tool temperature and workpiece temperature performed a similar rising trend with the increase of cutting parameters, including cutting speed, feed rate, radial feed, and axial feed. And their influence degrees decreased successively. The cutting force with different cutting parameters was also measured, and the relationship between cutting temperature and cutting force was discussed. It was found that cutting temperature and cutting force obtained in the experiment had the same fluctuation feature. Therefore, the cutting force and cutting temperature could complement each other for monitoring and analysis of the cutting process.