CVD金刚石厚膜刀具的制造及应用

随着汽车、宇航、电子工业的发展,大量有色金属和新型材料的广泛应用,使金刚石切削刀具的需求量迅速增长。化学气相沉积(CVD)金刚石作为一种新型超硬刀具的材料,为金刚石刀具的应用开辟了新的途径。CVD金刚石刀具主要有两种类型:CVD金刚石薄膜涂层刀具和CVD金刚石厚膜焊接刀具。金刚石薄膜涂层与刀具衬底材料之间的     

CVD金刚石刀具的研究进展与应用现状

金刚石膜是采用化学气相沉积的方法制备出来的一种全晶质多晶纯金刚石材料,是制造刀具的理想材料。本文对CVD金刚石涂层刀具与厚膜焊接刀具的研究进展与应用现状进行了简要的综述。     

CVD金刚石刀具的制备工艺研究

详细介绍了CVD金刚石厚膜刀具和涂层刀具的制备工艺，分析了目前制约CVD金刚石刀具制造和工业化过程的关键技术问题，制备出的CVD金刚石刀具满足了高硅铝合金等难加工材料的加工需求。     

CVD金属石膜刀具的制造技术及其应用

主要论述了CVD金刚石厚膜刀具制造过程中的几个关键工艺,包括切割、焊接、抛光和刃磨等,介绍了CVD金刚石膜刀具加工复合材料的实验研究。     

CVD金刚石刀具制备情况及应用

为扩大金刚石大刀具应用领域,1982年日、美两国相继开发出金刚石膜涂层刀具。它是利用CVD法,使金刚石晶体沉积在钨、钴类(常用K10)硬质合金或氮化硅陶瓷等基体上,如图1所示。可合成厚度小于30~50μm薄膜涂层,或做成大于0.5mm的厚膜,直接作为刀片坯料焊接到刀具上。它是一种化学气相沉积法制成的全晶质多晶纯金刚石材料,其晶粒之间的间隙为基团间隙。它一般呈膜状附着于基底表面,故又常称金刚石膜。CVD金刚石的制备成本远低于大颗粒的优质天然单晶金刚石,可以大面积化和曲面化,具有与天然金刚石完全相同的结构。表1为天然金刚石、PCD和CVD金刚石有关机械性能对比数据。图1CVD金刚石膜的SEM图片由表1可以看出,CVD金刚石刀具与PCD刀具相比,PCD刀具中因有钴等金属结合剂,使其更耐断裂,但钴会降低PCD的硬度,对腐蚀敏感(特别是加工塑料时),钴在高温时会加速金刚石向石墨的转变,故PCD刀具适合于粗加工和要求刀具有较高断裂韧性的场合。CVD金刚石刀具不用金属结合剂,纯度接近100%,故硬度、耐磨性和热导率更高,磨表1机械性能对比性能天然金刚石PCD CVD金刚石HV硬度(GPa)90~1005083杨氏模量(GP...     

铣削碳纤维复合材料刀具磨损试验研究

采用未涂层和CVD金刚石薄膜涂层两种硬质合金铣刀,对碳纤维复合材料进行铣削试验,使用3D激光扫描镜对刀具磨损形貌和磨损量进行测量,分析了刀具的磨损机理和切削用量对刀具磨损的影响。试验结果表明：后刀面磨损是两种刀具的主要磨损形式,磨损机理为磨料磨损,未涂层硬质合金铣刀同时存在着刀具破损现象;切削速率和背吃刀量对刀具后刀面的磨损影响较为显著;未涂层与CVD金刚石薄膜涂层硬质合金铣刀相比较,后刀面的磨损量保持在2．3—3．8倍之间,从刀具的耐磨性考虑,CVD金刚石薄膜涂层硬质合金铣刀可以用于碳纤维复合材料的生产加工。     

金刚石薄膜涂层刀具的发展与应用

对CVD金刚石薄膜涂层刀具的制造方法、性能特点、切削试验及应用前景进行了综合分析及预测。     

金刚石车刀及镀金刚石膜刀具

金刚石刀具的应用日益广泛,前景看好。本文首先介绍了用天然单晶金刚石制造的车刀,陈述金刚石取向与车刀性能的关系。给出金刚石车刀的设计与制造技术;然后报道采用ＣＶＤ技术制造的镀金刚石膜刀具和金刚石厚膜刀具及其切削试验结果。     

CVD金刚石厚膜刀具切削性能的试验研究

分析了CVD金刚石厚膜刀具材料的性能特点 ,对CVD金刚石厚膜车刀进行了精密切削和难加工复合材料切削试验 ,结果表明 :CVD金刚石厚膜刀具加工铝合金的表面粗糙度可达Ra0 0 5 μm ;切削难加工复合材料时刀具耐磨性和使用寿命明显优于硬质合金刀具、PCBN刀具和PCD刀具     

CVD金刚石薄膜刀具加工SiCp／Al复合材料的切削磨损研究

通过用CVD金刚石薄膜涂层刀具切削加工SiC颗粒增强基复合材料的试验,研究了切削参数、刀具材料、刀具几何参数和工件材料对CVD金刚石薄膜涂层刀具磨损的影响规律,同时研究SiCp/Al复合材料的切削加工性能。     

Machinability aspects concerning micro-turning of PA66-GF30-reinforced polyamide

This paper aims to study the behavior of machining forces and machined surface finish when micro-turning PA66-GF30-reinforced polyamide with various tool materials under distinct cutting conditions. The performance of polycrystalline diamond (PCD), CVD diamond coated carbide and plain cemented carbide tools (K15-KF and K15) were investigated in addition to the influence of feed rate on cutting forces, surface roughness and chip formation. The results indicated that the radial force was the highest force component because of the reduction in the effective cutting edge angle. Moreover, the cutting force increased almost linearly with feed, whereas the feed and radial forces remained unaltered. The cutting tools possessing lower edge radius promoted lower surface finish and turning forces, i.e., the best results were provided by the PCD tool, followed by the uncoated carbide inserts and finally by the CVD diamond-coated carbide tool.     

PCD与CVD金刚石显微组织及使用特性分析

经对PCD与CVD金刚石厚膜显微组织的研究，发现气相沉积法生产的金刚石厚膜与PCD有着完全不同的组织形式。研制刀具并进行切削性能试验，验证了CVD金刚石厚膜刀具的切削适用范围，分析了它们在机械切削加工领域中的不同使用特性。     

EFFECT OF CUTTING SPEED AND SURFACE CHEMISTRY OF CUTTING TOOLS ON THE FORMATION OF BUL OR BUE AND SURFACE QUALITY OF THE GENERATED SURFACE IN DRY TURNING OF AA6005 ALUMINIUM ALLOY

In the present investigation, AA6005 (ISO: AlSiMg) alloy was machined in turning operation with different cutting tools, such as uncoated cemented carbide insert, PVD TiN coated, CVD diamond coated and PCD insert, under dry environment. Effect of cutting speed was studied for each of the cutting tools with regard to the formation of built-up layer (BUL) or built-up edge (BUE). The rake surface of the tools was characterized by optical microscopy, scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopic microanalysis. Particular emphasis was given on wear mechanism of PVD TiN coated insert, conventionally used in machining ferrous alloys, during dry turning of AA6005 alloy. It has been observed that increase of cutting speed from 200 m/min to as high as 1000 m/min could not substantially reduce formation of BUL over tool rake surface during dry machining of AA6005 alloy with uncoated or PVD TiN coated cemented carbide inserts. The potential of diamond-based tools in dry machining of aluminium alloy was also studied. Finally, the effect of cutting speed on surface finish of the workpiece machined with different cutting tools was studied during dry turning of AA6005 alloy.     

改善CVD金刚石薄膜涂层刀具性能的工艺研究

用热丝CVD法,以丙酮和氢气为碳源,在WC-Co硬质合金衬底上沉积金刚石薄膜,在分析了工艺条件(衬底温度、碳源浓度、反应压力)对金刚石薄膜性能的影响的基础上,提出了分步沉积法改善金刚石薄膜涂层刀具性能的新工艺.结果表明,合理控制工艺条件的新工艺对涂层薄膜质量、形貌和粗糙度、薄膜与衬底间的附着力、刀具的耐用度及切削性能有显著影响,对获取实用化的在硬质合金刀具基体上沉积高附着强度、低粗糙度金刚石薄膜的新技术具有重要的意义.     

影响CVD金刚石涂层硬质合金界面结合强度的因素及其改善方法

化学气相沉积法制备金刚石涂层硬质合金刀具综合了金刚石与硬质合金的优异性能,被广泛应用于切削难加工材料.金刚石与基体界面结合强度是评价金刚石涂层的一个主要性能指标.本文主要介绍了影响CVD金刚石涂层刀具界面结合强度的主要因素,并对如何提高其界面结合强度的方法进行了较深入的探讨,这对解决刀具基体与金刚石涂层之间的界面结合强度问题具有一定的实际意义.     

FEM analysis in high speed machining of aluminium alloy (Al7075-0) using polycrystalline diamond (PCD) and cemented carbide (K10) cutting tools

The purpose of this paper is to study the thermal and mechanical behaviour in machining of aluminium alloys (Al 7075-0) using PCD (polycrystalline diamond) and K10 (cemented carbide) tools and to make a comparison between the performances of both tools. The study was made using a commercial finite element software. This software has a user friendly interface and can output several results including cutting forces, temperature, pressure, von Mises stress, maximum shear stress, plastic strain, and plastic strain rate which were the objectives of this study. By analysing the simulations, it was concluded that the polycrystalline tool has a superior performance in terms of cutting and feed forces and temperature when compared to the cemented carbide tool.     

高性能CVD金刚石薄膜涂层刀具的制备和试验研究

采用电子增强热丝EACVD法,以WC-Co硬质合金刀具为衬底制备金刚石涂层刀具,研究了提高涂层附着力的衬底预处理新方法,探讨了抑制Co催石墨化作用的有效措施,提出了改善金刚石薄膜表面粗糙度CVD后处理新工艺。研究结果表明,采用了Ar-H2微波等离子体刻蚀脱碳预处理方法对于提高金刚石薄膜涂层的附着力有明显效果,添加适量粘结促进剂,可有效地抑制CVD沉积过程中钴向表层扩散引起的催石墨化作用。采用分步沉积新工艺是减小金刚石薄膜表面粗糙度的有效方法。所制备的高附着力和低粗糙度的金刚石薄膜涂层刀具切削性能明显改善,对实现高效高精度切削加工具有十分重要的意义。