CVD金刚石薄膜涂层刀具精密切削表面质量的研究

CVD金刚石薄膜刀具的表面粗糙度及加工过程中的切削用量是影响加工工件表面质量的关键因素。为改进CVD沉积工艺 ,减小金刚石薄膜表面粗糙度 ,提出了合理控制沉积气压的新工艺方法 ,并通过切削试验研究了不同沉积工艺下制备的CVD薄膜涂层刀具和加工过程中不同切削用量对精密切削表面质量的影响。     

CVD金刚石薄膜涂层刀具精密切削表面质量的研究

CVD金刚石薄膜刀具的表面粗糙度和加工过程中的切削用量是影响加工工件表面质量的关键因素.为改进CVD沉积工艺,减小金刚石薄膜表面粗糙度,提出了合理控制沉积气压的新工艺方法,并通过切削试验研究了不同沉积工艺下制备的CVD薄膜涂层刀具和加工过程中不同切削用量对精密切削表面质量的影响.     

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.     

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。     

CVD金刚石厚膜焊接刀具的制造及切削性能

用于制造金属切削刀具的金刚石主要有四种类型：（1）天然单晶金刚石；（2）人工合成单晶金刚石；（3）聚晶金刚石复合片（PCD）；（4）化学气相沉积（CVD）金刚石膜。近年来，随着CVD金刚石工艺的发展，CVD金刚石对具的应用越来越广泛。CVD金刚石对具有两类：CVD金刚石薄膜涂层刀具和CVD金刚石厚膜焊接刀具。由于金刚石厚膜焊接刀具兼有单晶金刚石和金刚石薄膜涂层刀具的优点，从而具有广阔的应用前景。本文主要介绍金刚石厚膜的制备、厚膜刀具的制造及厚膜刀具的切削性能。     

CVD金刚石薄膜涂层铜线拉丝模的制备与应用

提高金刚石薄膜的表面质量和附着力是实现CVD金刚石涂层在耐磨器件领域中广泛应用的关键因素.本文通过优化沉积工艺参数,采用直拉丝化学气相沉积法在WC- Co硬质合金拉丝模内孔表面沉积金刚石薄膜.检测了该涂层的表面形貌、薄膜质量以及表面粗糙度,并把所制备的CVD金刚石薄膜涂层拉丝模具在拉拔铜线材生产线上进行了应用试验,结果...     

提高CVD金刚石薄膜刀具膜—基附着力的工艺方法评述

提高金刚石薄膜与硬质合金基底之间的附着力是CVD金刚石薄膜刀具得以推广应用的关键因素。本文介绍了国内外采用CVD法制备金刚石薄膜刀具时提高膜—基附着力的典型工艺方法 ,评述了WC Co基底预处理及沉积工艺对CVD金刚石薄膜与基底之间附着力的影响     

高性能复杂形状金刚石薄膜涂层刀具的制备和切削性能研究

通过偏压辅助增强热丝化学气相沉积法,采用螺旋形热丝排布方式以及优化的预处理方法和沉积工艺,在硬质合金印刷电路板铣刀的表面沉积了均匀的金刚石薄膜,采用扫描电镜和拉曼光谱研究了金刚石薄膜的表面特征.随后,通过铣削试验研究了金刚石涂层刀具的附着强度和切削性能.试验结果表明,复杂形状金刚石薄膜涂层铣刀既具有附着力强、耐磨性好的特点,同时又具备优异的切削性能,并且其制备无需后续抛光处理就能得到平整光滑的表面,这对于推动金刚石薄膜在复杂形状刀具上的产业化应用具有重要意义.     

CVD金刚石刀具的微细铣削仿真及试验研究

为研究切削参数对CVD金刚石微铣刀切削性能的影响,运用扩展有限元法对CVD金刚石微刀具的铣削加工和刀具损伤应力进行仿真模拟,研究了铣削加工后工件的表面粗糙度随切削参数的变化规律,分析了切削参数对微铣刀失效的影响,并通过试验验证了仿真结果的正确性。研究结果表明:在CVD金刚石微铣刀加工TC4钛合金时,铣削深度和每齿进给量的增加不利于工件加工质量的改善;铣削速度增加对工件加工表面粗糙度影响较小;铣削深度是影响刀具失效的主要因素,铣削速度和每齿进给量是影响刀具失效的次要因素。     

金刚石涂层刀具开发中衬底与热丝距离的研究

1 研究背景 金刚石涂层刀具在加工高硅铝合金、颗粒增强复合材料以及陶瓷等难加工材料时具有独特的优势.在金刚石涂层刀具制备中,刀具衬底表面的预处理和金刚石沉积工艺参数都会影响金刚石薄膜质量,进而影响刀具的切削性能.目前大量研究主要集中在衬底表面的预处理、碳源浓度、反应压力、偏压、衬底的温度控制等方面,而对于衬底与热丝之间的距离研究鲜有报道.     

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.     

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     

Tool wear and its effect on surface roughness in diamond cutting of glass soda-lime

For the technology of diamond cutting of optical glass, the high tool wear rate is a main reason for hindering the practical application of this technology. Many researches on diamond tool wear in glass cutting rest on wear phenomenon describing simply without analyzing the genesis of wear phenomenon and interpreting the formation process of tool wear in mechanics. For in depth understanding of the tool wear and its effect on surface roughness in diamond cutting of glass, experiments of diamond turning with cutting distance increasing gradually are carried out on soda-lime glass. The wear morphology of rake face and flank face, the corresponding surface features of workpiece and the surface roughness, and the material compositions of flank wear area are detected. Experimental results indicate that the flank wear is predominant in diamond cutting glass and the flank wear land is characterized by micro-grooves, some smooth crater on the rake face is also seen. The surface roughness begins to increase rapidly, when the cutting mode changes from ductile to brittle for the aggravation of tool wear with the cutting distance over 150 m. The main mechanisms of inducing tool wear in diamond cutting of glass are diffusion, mechanical friction, thermo-chemical action and abrasive wear. The proposed research makes analysis and research from wear mechanism on the tool wear and its effect on surface roughness in diamond cutting of glass, and provides theoretical basis for minimizing the tool wear in diamond cutting brittle materials, such as optical glass.     

用CVD金刚石厚膜车刀加工硬质合金的研究

采用CVD金刚石厚膜车刀对K10硬质合金进行了不同安装前角下的切削加工试验,比较分析了刀具的磨损状况和加工表面粗糙度随前角的变化规律。结果表明,增大车刀安装前角的负值,可以抑制切削刃边缘的破碎及直线刃部的剥离破碎,提高工件的加工表面质量。     

EFFECT OF COATING ROUGHNESS ON PERFORMANCE OF SMALL CVD DIAMOND COATED TOOLS

□ Small milling tools for dental application were diamond coated by means of Hot Filament CVD (HFCVD). Different thicknesses were obtained by using different diamond deposition times (3 and 12 h) and seeding conditions. The surface roughness was measured for coated and uncoated mills and milling tests were performed to measure the cutting forces. A ceramic material and a polymeric matrix composite (PMC) were used as workpiece materials. The highest cutting forces were measured for the coated tool with the highest thickness of the diamond coating. Probably, roughness increase and non-optimal edge profiles affect the tool behavior during cutting. As a consequence, tool failure was observed in the case of milling of ceramic by means of the coated tool with the highest coating thickness. The coated tool with a lower thickness of the diamond coating showed an optimal behavior under cutting, above all in the case of PMC milling.