Analysis of tool temperature fluctuation in interrupted cutting

A unidimensional model for temperature distribution in the tool during intermittent cutting is presented. The tool-chip interface heating is approximated by a periodic rectangular heat flux. The effects of cutting time ratio, frequency of temperature fluctuation and thermal diffusivity of the tool material on internal temperature distribution and on thermal stresses developed in the tool have been discussed. With increasing cutting frequency, the temperature gradient in the cutting zone increases, but with higher thermal diffusivity of the tool material, it diminishes. The magnitude of thermal stresses increases with increase in amplitude of temperature fluctuation     

PCBN刀具断续切削淬硬钢瞬态冲击力研究

基于正交试验设计方法,使用PCBN刀具进行干式断续车削淬硬钢Cr12Mo V试验,研究了不同切削参数与工件硬度对瞬态冲击力的影响。应用响应曲面法建立了瞬态冲击力的线性预测模型和指数预测模型。研究结果表明:断续切削方式下,工件硬度和切削速度对瞬态冲击力有显著影响;线性预测模型和指数预测模型均能准确地对瞬态冲击力进行预测。     

干切削加工刀具及其设计

适宜的刀具材料和刀具几何参数是干切削加工的关键条件之一.在分析干切削加工对刀具要求的基础上,阐述了干切削刀具设计的要点,并结合应用实例说明了刀具设计对干切削加工的重要性.     

超硬刀具加工复合材料的切削性能和切削机理

复合材料属于难加工材料 ,用超硬刀具切削复合材料最为有效。作者用杭州华汇金刚石技术研究所研制的CVD金刚石厚膜刀具对两类复合材料 ,进行了切削试验 ,取得了良好效果。本文列出了部分试验数据 ,并初步探讨了切削机理。     

大型冷却塔制造与特形齿管加工刀具安装

在石化设备塔器制造中,需要对塔器内件齿管进行机械加工成形.简介齿管的制造工艺技术.     

Influence of vacuum-plasma nitride coatings on contact processes and a mechanism of wear of working surfaces of high-speed steel cutting tool at interrupted cutting

The paper presents the studies of mono- and multicomponent nitride vacuum and plasma coatings (Ti_{100 ? x} Al _x )N, etc. at interrupted cutting. The contact processes during milling and the effect of the coatings on cutting forces, coefficient of friction, tool surface tension, and tool vibration due to variable tangential forces are considered. The influence of the coatings on abrasive wear resistance and resistance to cracking at variable thermal power loading is proved.     

Cutting parameter and tool path style effects on cutting force and tool deflection in machining of convex and concave inclined surfaces

Convex and concave inclined surfaces are frequently encountered in the machining of components in industries such as aerospace, aircraft, automotive, biomedical, and precision machinery manufacturing and mold industries. Tool path styles, generated by different cutting strategies, result in various cutting forces and tool deflection values that might lead to poor surface integrities. In cost-effective manufacturing, it is helpful to make known their effects on machinability. Thus, the first aim of this study is to investigate optimum cutting parameter values in ball end milling of EN X40CrMoV5-1 tool steel with three coated cutters. The parameters taken into consideration are cutting speed, feed rate, step over, and tool path style. The second aim of the study is to determine the effects of tool path styles in ball end milling of inclined surfaces. As a result, the most effective parameter within the selected cutting parameters and cutting styles for both inclined surfaces and different coatings was step over. In terms of tool coatings, the most rapidly deteriorating coating was TiC coating for cutting forces in both inclined surfaces and for tool deflection in convex inclined surface. In addition, the response surface methodology is employed to predict surface roughness values, depending on the cutting forces obtained. The model generated gives highly accurate results.     

近年切削刀具品种及刀具材料的变化

刀具材料的发展和变化是推动金属切削工艺进展的重要因素之一。不同刀具材料的刀具销售值在刀具总销售值中的构成比能反应不同国家刀具应用水平的高低。本文分析“不同刀具材料的刀具销售值构成比”和“各种刀具大类品种构成比”的近年变化，以说明其现状与趋势。     

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,     

Cutting the costs of cutting metal

Too many tools spoil the profits, so it is essential for manufacturing profitability to reduce tool inventories. Work being done at the University of Durham is pointing the way to computer selection of cutting tools and the management of stocks.     

干式切削刀具技术

干式切削技术作为一种绿色制造工艺,又是一项庞大的系统工程,需要从刀具技术、机床结构和工艺过程等各方面采取一系列的措施,而首当其冲的是切削刀具技术,设计干式切削刀具时,不仅要选择适用的刀具材料和采用的涂层,而且应当综合考虑刀具材料、刀具涂层和刀具几何形状之间的相互兼顾和优化.     

Cutting tool strategies for multifunctional part configurations: Part I—analytical economic models for cutting tools

The optimisation problem of multifunctional cutting tools, including multistep and combination tools, has been investigated. The tools' concepts for their physical understanding are discussed in order to provide the necessary background for the reader. Since they are not available in the literature, the necessary mathematical models for the optimsation are analysed based on constant tool speed (rpm), constant surface speed and variable speed or feed for each tool step and/or function. The integration of the mathematical models in optimisation schemes results in an analytical design tool for modelling and simulation of the advanced multifunctional tools in an early part processing stage that refines the process and tooling approaches while determining the sensitivity of these tools to the performance and production cost of individual machines. The aforementioned problem has been theoretically analysed here, while heuristic optimisation algorithms for determining the optimum cutting speed(s) and feed(s) for the multifunctional tools are presented in Part II of this paper. Experimental results and analytical examples which demonstrate the effectiveness and advantages of the proposed approach utilising the described mathematical models are presented in Part II.     

陶瓷刀具在生产中的应用介绍

简要介绍陶瓷刀具在生产中使用情况，对该刀具在加工中的参数作了分析。     

第九届中国国际机床展览会刀具展品述评

第九届中国国际机床展览会(CIMT2005)于2005年4月11日至17日在北京国际展览中心成功举办。我国机床工具工业的巨大市场和无限商机,使本届展览会展商云集观众如潮。参加本届展览会的刀具展商约120家,几乎包括所有国内外的著名刀具制造商。琳琅满目的刀具展品,不仅代表了当前切削刀具的先进水平及切削技术的发展趋势,而且显示出现代切削刀具在推进制造技术进步和提高企业加工效率、降低制造成本方面所发挥的重要作用。现就本届展览会的刀具展品评述如下。     

Multi-scale statistical signal processing of cutting force in cutting tool condition monitoring

The International Journal of Advanced Manufacturing Technology - In a machining system, accurate tool wear condition monitoring is paramount for guaranteeing the quality of the workpiece and tool...     

Using a tool with wear-resistant coatings in transverse cutting and thread cutting

The influence of multilayer wear-resistant coatings on the contact processes and the thermal state of the tool in the transverse cutting and thread cutting of workpieces is studied. The effectiveness of cutters with the proposed multilayer coatings is demonstrated.     

Analytical prediction of cutting tool wear

An analytical method is presented which enables the crater and flank wear of tungsten carbide tools to be predicted for a wide variety of tool shapes and cutting conditions in practical turning operations based only on orthogonal cutting data from machining and two wear characteristic constants. A wear characteristic equation is first derived theoretically and verified experimentally. An energy method is developed to predict chip formation and cutting forces in turning with a single-point tool from the orthogonal cutting data. Using these predicted results, stress and temperature on the wear faces can be calculated. Computer simulation of the development of wear is then carried out by using the characteristic equation and the predicted stresses and temperatures upon the wear faces. The predicted wear progress and tool life are in good agreement with experimental results.     

高速切削中的刀具材料

结合高速切削加工技术和刀具材料的研究,综合论述高速切削加工刀具材料的性能特点、研究进展和应用,展望高速切削加工刀具材料的未来。     

微细切削与微小型化机床

介绍微细切削的可行性、优点及其应用前景。概述机床微小型化的可行性、优点以及研究进展。指出通过微小型化 机床以大规模并行的方式集成微型制造系统,将是一种有希望的技术方法。同时,简要探讨了机床微小型化的有关问题。