T813新型涂层硬质合金刀片

<正>美国 Toshiba Tungaloy公司是日本东芝公司的分公司。最近该公司推出一种牌号为T813型的涂层硬质合金刀片。刀片的主要特点是在含钴硬质合金基体上用Al2O3涂层材料多次涂覆而成。经切削试验表明,这种涂层刀片具有耐用度高,耐磨性好,耐冲击,抗破损等优点。刀片     

刀具涂层对42GrMo钢切削性能的影响研究

针对生产加工中采用较高切削速度切削直径和长度尺寸较大的42GrMo钢零件时刀具磨损严重的情况,运用DEFORM-3D有限元软件对42GrMo钢的切削过程进行仿真,得出TiN-Al2O3-TiCN复合层和Al2O3单层两种硬质合金涂层刀具对切削力和切削温度的影响。仿真结果表明采用TiN-Al2O3-TiCN涂层刀具的切削温度明显低于Al2O3涂层刀具,有利于提高刀具的耐用度。     

α-Al_2O_3涂层晶粒大小对刀片切削性能的影响

采用CVD法在硬质合金基体上沉积了4种不同晶粒大小的α-Al2O3涂层。通过SEM分析了氧化铝涂层晶粒大小及特点,并对4种氧化铝涂层刀片进行喷砂后处理及切削试验。发现氧化铝晶粒越细,晶粒越均匀,涂层刀片切削性能越优异。     

涂层Si_3N_4陶瓷刀具切削性能研究

研究了不同切削参数对TiN+Al2O3涂层氮化硅陶瓷刀具切削灰铸铁的切削性能的影响,使用工具显微镜、SEM/EDS手段分析了涂层氮化硅刀具的磨损机理,实验还采用相同基体氮化硅陶瓷刀具做了对比分析。研究结果显示TiN+Al2O3涂层氮化硅刀具可以承受比较大的切削用量,对提高加工效率有重大意义;还发现涂层氮化硅陶瓷刀具主要失效形式为磨粒磨损,粘结磨损,在较高切削速度条件下前刀面还会出现因化学磨损形成的月牙洼。     

硬质合金涂层的新方法

涂层硬质合金刀具具有高的硬度、耐磨性,耐热性和抗月牙洼磨损能力,并能降低刀具与工件间的摩擦系数,具有很高的耐用度。此外,因它的通用性广,一种牌号的涂层硬质合金刀片常可胜任几个等级的未涂层刀片的切削工作,从而简化了刀具的管理。所以,近年来硬质合金刀具,特别是可转位刀片,涂层刀具的应用日益普遍。通常采用TiN(氮化钛)做硬质合金的涂层材料。众所周知,硬质合金TiN涂层一般都采用CVD(化学气相沉积)法,但因此法的沉积温度高,约1000℃左右,所以在涂层与硬质合金基体之间容易形成一层脆性的脱碳层,导致刀片脆性脱断,降低刀具的使用寿命。近年来的研究表明,只要正确掌握涂层工艺,PVD(物理气相沉积)法     

涂层对硬质合金基体强度的影响

在实际切削中发现涂层刀具的耐冲击性能与硬质合金基体的设计预期存在一定差异。通过试验研究,得出了不同粒度涂层和非涂层硬质合金刀具的强度变化规律,发现在500℃-1100℃的涂层温度下,硬质合金基体的强度均有不同程度的下降,为涂层刀具基体材质的设计提供了参考。     

高速钢刀具氮化钛涂层磨损特性

一、前言研究氯化钛涂层高速钢刀具（简称涂层刀具）的磨损特性及磨损规律对正确使用这类刀具有重要的指导意义。涂层高速钢刀具多为复杂刀具，在实验中为便于观察研究，特按复杂刀具的角度设计了一种刀片，将刀片安装在机夹刀刀体上，在无级调速车床上进行耐磨性试验。刀片基体材料为WgM03Cr4V，常温硬度64～65HRC。刀片在美国多弧公司MAV－32型离子镀膜机上涂制。膜层厚度为2．4～3．lpm，显微硬度为2000HV左右，研究方法及手段：在一定的切削条件下，涂层刀具和末涂层刀具分别切削相同的工件、测量切削力，切削温度的数值，利用双管…     

ZrN涂层YT15硬质合金刀具的制备及切削性能

采用中频磁控溅射和电弧离子镀相结合的方法,在YT15硬质合金刀片上制备了三种ZrN涂层,测试了涂层的物理性能,并通过切削试验研究了不同ZrN涂层对YT15硬质合金刀具切削性能的影响,并与无涂层刀具的切削效果进行了对比。结果表明:ZrN涂层的硬度较YT15硬质合金刀具的提高了12 GPa;三种涂层刀具中,有锆过渡层的ZrN涂层刀具降低了切削过程中刀具的切削力,使刀具的耐磨损性能得到提高。     

涂层硬质合金刀片

<正> 金属切削加工时,根据材料不同的化学和物理性能而采用一定牌号的硬质合金刀片。由于刀片经过涂复,则使用范围扩大了并且刀具寿命得到提高。发展了一种多基涂层刀片。即在硬质合金可转位刀片上涂复碳化钛(TiC)、三氧化二铝(Al_2O_3)和氮化钛(TiN)。由于刀片经过涂复,则具有     

陶瓷粉末涂层硬质合金刀具的切削性能

介绍一种新型陶瓷涂层刀具材料及刀具,它是采用溶胶－凝胶法在硬质合金粉末表面涂覆一层氧化铝陶瓷,然后将涂层粉末热压烧结成形。切削试验表明,粉末涂层刀具切削高硬度材料时具有优良的切削性能。     

溶胶—凝胶法制备Al_2O_3涂层对工程陶瓷表面改性的研究

利用溶胶—凝胶法在SG4工程陶瓷基体上成功制备了Al2 O3 涂层 ;利用差热分析 (DTA)方法对Al2 O3凝胶粉末的热处理过程进行了研究。对线切割、粗磨、精磨、Al2 O3 一次溶胶涂层和Al2 O3 二次溶胶涂层试样的抗弯强度进行了比较 ,并通过观察Al2 O3 一次溶胶涂层和Al2 O3 二次溶胶涂层试样表面和断面的SEM形貌 ,初步分析了表面改性的原因。分析结果表明 :溶胶涂层弥合基体表面微裂纹是提高抗弯强度的根本原因 ;Al2 O3 溶胶二次涂层试样表面质量好于一次涂层试样 ,可以更好地弥合基体表面微裂纹 ,使基体的抗弯强度更高。因此溶胶—凝胶法是陶瓷表面改性的一种有效方法。     

TiAlN涂层刀具对不同调质状态40Cr钢切削性能研究

为了更好地指导TiAlN涂层刀具在金属切削加工中的应用,采用物理气相沉积法制备了TiAlN涂层刀具,应用TiAlN涂层刀具和未涂层刀具对不同调质状态的40Cr钢进行了干式切削试验。通过对切削过程中切削力和切削温度检测,考察了TiAlN涂层刀具的切削性能。结果表明,与YTl5硬质合金刀具相比,TiAlN涂层刀具适合切削高硬度的金属材料,且优越性更明显。     

用溶胶—凝胶方法制备磁光记录用的铋代钇铁石榴石薄膜

研究了在ＧＧＧ基底上用溶胶—凝胶方法制备的铋代钇铁石榴石单晶薄膜的磁光法拉弟效应与铋的替代量之间的关系。该膜层是以低于液相外延３００℃左右的６６０℃在大气中退火４ 小时制得的。最大的铋的置换量为ｘ＝ ２．７,实验发现石榴石相的晶化温度随ｘ 的增大而降低。且薄膜有很强的法拉弟效应,在λ＝ ０．６３３μｍ 的波长,可达－ ８．１×１０４ｄｅｇ／ｃｍ 。     

Comparative study on tool life and wear resistance of titanium nitride (TiN) and aluminium chromium nitride (AlCrN) coated carbide inserts

Abstract

The objective of this study is to investigate the enhancement of tool life and wear resistance with a physical vapour deposition (PVD) process applied using aluminium chromium nitride (AlCrN) and titanium nitride (TiN) coating on carbide inserts. Flank wear experiments are carried out on a computer numerically controlled (CNC) machine under wet conditions with both the coated inserts. Effectiveness of the coating on the tool life and its resistance to flank wear are observed at various cutting parameters such as cutting speed and feed rate by following the principle of design of experiments (DOE). It is inferred that AlCrN coated carbide tools perform nearly 70% better than the TiN coated carbide tools under high cutting speed and feed rate. AlCrN coating also enhances the durability of tool for metal cutting and thereby improves tool life even under harsh cutting conditions. A response surface methodology (RSM) is utilised to arrive at the optimum value for the various parameters which are responsible for improving the wear resistance and tool life.     

清洁切削高温合金涂层刀具切削性能及加工表面完整性

针对高温合金高速干切削刀具磨损严重、加工表面质量差等突出问题,基于清洁切削技术,采用硬质合金涂层刀具进行高速铣削高温合金GH2132试验,研究干式切削、液氮不同喷射温度对涂层刀具切削性能以及加工表面完整性的影响规律,探究运用清洁切削高温合金来延长涂层刀具寿命和提高加工表面质量的可行性。研究表明：液氮低温切削GH2132时的切削合力随喷射温度的降低而增大,切削区温度在-150～-190℃喷射时已完全处于低温状态;随着液氮喷射温度的降低,刀具涂层剥落面积明显减小,且降低了黏结磨损和氧化磨损,在-150℃喷射条件下可获得较长的刀具寿命;加工表面粗糙度S_a在-30～-150℃喷射条件下获得较小值,随喷射温度的降低,加工硬化和残余拉应力分别增大和减小;与干式切削相比,液氮切削喷射温度在-150～-190℃下可显著延长涂层刀具寿命并提高加工表面质量。     

Elliptical vibration cutting of hardened die steel with coated carbide tools

Elliptical vibration cutting of hardened die steel with coated carbide tools is examined in this research in order to achieve low-cost high-precision machining. Diamond coated tools are applied because of superior hardness of their polycrystalline diamond coating and its low manufacturing cost. TiN coated tools are also tested, since they are widely used for conventional machining of steels. Machinability of hardened die steel by the elliptical vibration cutting with coated carbide tools is discussed in three aspects in this study, i.e. transferability of cutting edge profile to cut surface, cutting force, and tool life. The transferability is evaluated quantitatively by calculating correlation coefficients of measured roughness profiles. It is clarified that the diamond coated tools have high transferability which leads to diffraction of light on the surface machined at micro-scale pick feed. Total cutting forces including ploughing components are measured at various feed rates, and then shearing components and ploughing components are separated utilizing linear regression. The measured results indicate, for example, that the all forces become considerably smaller only when elliptical vibration is applied to the TiN coated tool without cutting fluid. It is also found that this considerable reduction of forces interestingly corresponds to higher friction coefficient, which is identified from the ploughing components. Tool life tests are carried out by various machining methods, i.e. elliptical vibration/ordinary wet/dry cutting with diamond/TiN coated tools. The result shows, for example, that the flank wear is smallest in the wet elliptical vibration cutting with the diamond coated tool.     

TiAlN涂层硬质合金刀具铣削35CrMoSiV钢的切削性能研究

采用有和无PVD TiAlN涂层的细晶硬质合金铣刀对35CrMoSiV合金钢进行了干式端面铣削试验。分别测量了有、无涂层情况下铣刀后刀面径向磨损量和加工槽的表面粗糙度,通过光学显微镜观察了切屑,利用扫描电子显微镜(SEM)和电子能谱(EDX)分析了后刀面的磨损形态。研究结果表明:TiAlN涂层明显提高了硬质合金刀具的切削性能;硬质合金刀具后刀面磨损机制主要为粘着磨损和磨粒磨损,而涂层损伤是粘着磨损、剥层和氧化磨损共同作用的结果;在正常工作区内,提高铣削的转速和进给量,有利于减轻刀具的粘着,提高切削效率和质量。     

High-Speed Machining of Malleable Cast Iron by Various Cutting Tools Coated by Physical Vapor Deposition

The coating material of a tool directly affects the efficiency and cost of machining malleable cast iron.However,the machining adaptability of various coating materials to malleable cast iron has been insufficiently researched.In this paper,turning tests were conducted on cemented carbide tools with different coatings(a thick TiN/TiAlN coating,a thin TiN/TiAlN coating,and a nanocomposite(nc)TiAlSiN coating).All coatings were applied by physical vapor deposi-tion.In a comparative study of chip morphology,cutting force,cutting temperature,specific cutting energy,tool wear,and surface roughness,this study analyzed the cutting characteristics of the tools coated with various materials,and established the relationship between the cutting parameters and machining objectives.The results showed that in malleable cast iron machining,the coating material significantly affects the cutting performance of the tool.Among the three tools,the nc-TiAlSiN-coated carbide tool achieved the minimum cutting force,the lowest cutting tempera-ture,least tool wear,longest tool life,and best surface quality.Moreover,in comparisons between cemented-carbide and compacted-graphite cast iron machined under the same conditions,the wear mechanism of the coated tools was found to depend on the cast iron being machined.Therefore,the performance requirements of a tool depend on multiple factors,and selecting an appropriately coated tool for a particular cast iron material is essential.     

OPTIMIZATION OF THE CUTTING EDGE GEOMETRY OF COATED CARBIDE TOOLS IN DRY TURNING OF STEELS USING A FINITE ELEMENT ANALYSIS

This paper investigates the effects of edge radius of a round-edge coated carbide tool on chip formation, cutting forces, and tool stresses in orthogonal cutting of an alloy steel 42CrMo₄ (AISI 4142H). A comprehensive experimental study by end turning of thin-walled tubes is conducted, using advanced coated tools with well-defined cutting edge radii ranging from 5 to 68 microns. In parallel, 2-D finite element cutting simulations based on Lagrangian thermo-viscoplastic formulation are used to predict the cutting temperatures and tool-stress distributions within the tool coating and substrate. The results obtained from this study provide a fundamental understanding of the cutting mechanics for the coated carbide tool used, and can assist in the optimization of tool edge design for more complex geometries, such as chamfered edge. Specifically, the results obtained from the experiments and simulations of this study demonstrated that finite element analysis can significantly help in optimizing the design of coated cutting tools through the prediction of tool stresses and temperatures, especially within the coating layer.     

车、铣不锈钢的硬质合金涂层刀具研究

对不锈钢切削加工中使用最多的硬质合金涂层刀具进行了研究。重点探讨了刀具的磨损和失效机理、适宜切削不锈钢的涂层刀具基体和涂层的种类及特性。