纳米TiN改性TiC基金属陶瓷刀具切削性能的研究

制备了纳米TiN改性的TiC基金属陶瓷刀片 ,并用该刀片与普通TiC基金属陶瓷刀片进行了对比切削试验。结果表明 ,添加TiN纳米粒子可有效改善TiC基金属陶瓷刀具的机械性能和切削性能 ,改性金属陶瓷刀片可以较高切削速度加工碳钢和合金钢 ,此时其主要失效形式为粘结磨损     

用于加工难加工材料的金属陶瓷刀片

<正> 用氮化钛(TiN)制成了含有碳化物的金属陶瓷刀片。该种刀片可用于加工有焊缝的钢件及硬度为HRC42的耐热或耐腐蚀钢。用一可转位立铣刀(3个刀刃,直径为50.8毫米)加工图1所示的42CrMo4调质钢凹槽(深度为38.1毫米,457×419.1毫米),所需机动时间近8小时,在此期间可转位硬质含金刀片须换刃6次。切削深度可至1.5毫米、进给量可达356毫米/分。用图2所示的金属陶瓷可转位刀片加工图1所示的凹槽,在3.5小时内即可完成,刀片只需换刃1次。切深可达0.25毫     

新型金属陶瓷刀片

加工低碳钢等材料时，容易形成软质切屑，不易折断排出。日本住友电工公司针对这一特点，开发出一种新型可转位刀片，配以FA型断屑槽。新型刀片在切削刃尖端部分和侧壁部分作了较大改进，断屑排屑性能大为提高，切屑沿径向卷曲成小卷，可在最佳尺寸处折断。前刀面尖端部分的前角为20°，前刀面上有小坑，可将切屑引人凹面断屑槽，并在1～3cm范围内折断。刀片材料系住友公司新开发的高韧性金属陶瓷，耐磨性和抗崩刃性均有较大改善，与过去的金属陶瓷相比，使用寿命提高2～4倍，可用于高精度切削加工。此种刀片拟于1997年4月投放市场，届时该…     

新型纳米金属陶瓷刀片切削性能的研究

通过对某硬质合金厂最新开发的纳米金属陶瓷刀片与普通金属陶瓷刀片、硬质合金YT15刀片切削性能对比试验研究，得出了纳米金属陶瓷刀片的试验性能数据，建立了切削力指数公式。试验研究表明，该刀片耐磨性好、耐用度高、切削性能好，是精加工和半精加工的理想刀具。     

陶瓷刀高速切削铸铁飞轮

在美国通用汽车公司的比克(Buick)汽车分卩,陶瓷刀片或金属陶瓷刀片已取代了涂复的硬质合金刀片加工铸铁飞轮。由于这种新的刀具和一台机器人,两台车床的净生产率已从15件/小时提高到50件/小时。     

UP35N系列金属陶瓷刀片

<正> 日本三菱金属公司开发了一种新型PVD 涂层工艺的金属陶瓷刀片系列(UP35N),以适应低中进给率的钢和铸铁的高速车削加工。 UP35N金属陶瓷刀片系列有两种刀片:即日本三菱金属公司的MA断屑槽型和用于微型工具的可转位式刀片。制造者宣称,UP35     

金属陶瓷螺旋立铣刀槽型优选及应用研究

通过NAK80模具钢的铣削试验,运用全面试验方法研究金属陶瓷螺旋立铣刀螺旋角和径向前角对切削性能的影响,优化了其结构参数,对比研究了涂层和非涂层金属陶瓷立铣刀切削性能、涂层金属陶瓷立铣刀在气冷和水冷条件下切削性能。利用扫描电镜(SEM)、X射线能谱仪(EDS)对主切削刃进行观察,研究了两种刀片的磨损形态及磨损机理。试验结果表明:优选金属陶瓷螺旋立铣刀螺旋角为45°,径向前角为0°;非涂层金属陶瓷螺旋立铣刀不适合加工P类材料,Al Ti N涂层金属陶瓷螺旋立铣刀加工P类材料时磨损形式为粘结磨损和化学磨损;气冷有利于减小刀具磨损,延长刀具寿命;水冷有利于提高零件表面质量,表面粗糙度值可稳定在Ra0. 05以下,但因热冲击作用,其金属陶瓷基体易出现热裂纹,导致出现刀具微崩和涂层不规则脱落现象。     

加工参数对高速铣削超高强度钢32Cr3NiMoVA刀具磨损的影响

采用金属陶瓷刀具高速铣削超高强度钢32Cr3NiMoVA,研究加工参数(切削速度、进给量和切削深度)对刀具磨损的影响。研究结果表明:在切削速度范围400～1 000 m/min之内,金属陶瓷刀片前刀面都有垂直于切削刃刃口的热裂纹产生,切削速度和切削深度越大,热裂纹越显著,进给量越大,热裂纹反而减少。采用金属陶瓷刀片铣削超高强度钢时,推荐采用较小的切削速度和较大的进给量。     

加工技术与研究的新进展

多层PVD涂层与超细晶粒刀片产品、润滑涂层和CVD金刚石涂层的推广应用，显著提高了刀片性能和加工的生产率，同样，状态监视、计算机模拟、高速加工和多功能复合加工也已成熟，本文简要介绍了英国的相关研究进展。     

Dijet公司开发刀片新材料

日本Dijet公司最近开发出一批新材料，用来制作可转位刀片．用户反应良好。这批新材料包括三种涂层产品和四种金属陶瓷产品。在制作这批材料的过程中．采用了一些新型制作技术．使这些刀片具有使用寿命长、切削稳定的特点．并可用于难加工材料的切削和高速高效率切削加工。涂层刀片的基体材料为该公司自行开发的耐磨性和抗热裂性优异的硬质合金，表面涂覆抗崩刃性很强的Ti化物复合涂层．刀片牌号为JC4030。另一种涂层刀片的基体材料也为新开发的超硬高强度合金，刀片牌号为JC3645。这批涂展和金属陶瓷刀片主要供铣削加工使用，工具寿命提…     

Edge micro-creation of Ti(C,N) cermet inserts by micro-abrasive blasting process and its tool performance

Abstract

In this study, the cutting edge passivation by a micro-abrasive blasting method for cermet inserts and its machining performance were investigated. The micro-abrasive blasting parameters for cermet inserts were optimized and the micro-creation of cutting edge was determined with detail. A Back Propagation (BP) neural network prediction model was further established based on our micro-abrasive blasting experiment datum, which can directly evaluate the micro-abrasive blasting ability to generate the specific edge radius. The improvement of cutting performance of micro-abrasive blasted cermet inserts benefits from the strengthening of cutting edge that caused by the obvious elimination of a large number of micro-defects rooted around the edge, and the formation of circular cutting edge is the result of brittle removal and plastic removal. The micro-creation of inserts can acquire a circular cutting edge, and the optimal edge radius is 15?μm under the selected cutting conditions when the tool life was chosen as an optimization target and the surface roughness was simultaneously taken into account. It is found that the blasted cermet inserts can prolong the tool life by at least 86% and the machined-surface quality can be improved by up to 1.65?μm, compared to inserts without micro-abrasive blasting.     

浅孔钻的径向力平衡及关键参数设计

通过对WCMX型刀片可转位浅孔钻的受力分析,提出应以径向力平衡作为浅孔钻的设计原则;对内刀片的过轴心线值、刀片切削刃的余偏角及内外刀片轴向相对位置、端面相对于圆心位置等重要设计参数进行了分析和阐释,并给出了推荐值;推导出了内刀片偏转角β的计算公式。     

MACHINING PARAMETERS OPTIMIZATION FOR ALUMINA BASED CERAMIC CUTTING TOOLS USING GENETIC ALGORITHM

Alumina-based ceramic cutting tools can be operated at higher cutting speeds than carbide and cermet tools. This results in increased metal removal rates and productivity. While the initial cost of alumina based ceramic inserts is generally higher than carbide or cermet inserts, the cost per part machined is often lower. Production cost is the main concern of the industry and it has to be optimised to fully utilize the advantages of ceramic cutting tools. In this study, optimization of machining parameters on machining S.G. iron (ASTM A536 60-40-18) using alumina based ceramic cutting tools is presented. Before doing the optimization work, experimental machining study is carried out using Ti [C,N] mixed alumina ceramic cutting tool (CC 650) and Zirconia toughened alumina ceramic cutting tool (Widialox G) to get actual input values to the optimization problem, so that the optimized results will be realistic. The optimum machining parameters are found out using Genetic algorithm and it is found that Widialox G tool is able to machine at lower unit production cost than CC 650 tool. The various costs affecting the unit production cost are also discussed.     

MACHINING PARAMETERS OPTIMIZATION FOR ALUMINA BASED CERAMIC CUTTING TOOLS USING GENETIC ALGORITHM

Alumina-based ceramic cutting tools can be operated at higher cutting speeds than carbide and cermet tools. This results in increased metal removal rates and productivity. While the initial cost of alumina based ceramic inserts is generally higher than carbide or cermet inserts, the cost per part machined is often lower. Production cost is the main concern of the industry and it has to be optimised to fully utilize the advantages of ceramic cutting tools. In this study, optimization of machining parameters on machining S.G. iron (ASTM A536 60-40-18) using alumina based ceramic cutting tools is presented. Before doing the optimization work, experimental machining study is carried out using Ti [C,N] mixed alumina ceramic cutting tool (CC 650) and Zirconia toughened alumina ceramic cutting tool (Widialox G) to get actual input values to the optimization problem, so that the optimized results will be realistic. The optimum machining parameters are found out using Genetic algorithm and it is found that Widialox G tool is able to machine at lower unit production cost than CC 650 tool. The various costs affecting the unit production cost are also discussed.     

铸铁加工专用切削刀片的研制与应用

研制开发了用于铸铁切削的系列涂层刀片,介绍了该刀片的设计思路和研制方法,分析了刀片涂层的结构及特点。切削试验和用户试用结果表明,该系列刀片具有优异的切削性能。     

MATHEMATICAL MODEL OF MILLING TEMPERATURE AND TEMPERATURE FIELD ANALYSIS FOR THREE-DIMEN-SIONAL COMPLEX GROOVE MILLING INSERT

The mathematical mode1 on the temperature of the waved-edge is constructed accordingto Jaeger's theory of moving solid and based on the used temperature model of the fiat insert. It ispossible to forecast the milling temperature through programming. The comParable experimentshave been done between the two new three-dimension groove inserts (waved-edge insert, great edgeinsert) and flat fake insert. The theoretic forecast is in good agreement with the experimental result.     

Performance evaluation of PVD TIALN coated carbide tools vis-à-vis uncoated carbide tool in turning of titanium alloy (Ti-6Al-4V) by simultaneous minimization of cutting energy,dimensional deviation and tool wear

Titanium alloys are difficult-to-machine materials because of their poor machinability characteristics. Machining and machining performance evaluation for such materials is still a challenge. Individual machining performance indices like cutting forces, cutting energy and tool wear lead to ambiguous understanding. In this work, a Cumulative Performance Index (CPI) is defined which amalgamates non-dimensional forms of specific cutting energy, back force and average principal flank wear in turning. The CPI focuses upon simultaneous minimization of specific cutting energy, dimensional deviation and average principal flank wear. The defined index is then used to evaluate performance of five commercially available physical vapor deposited (PVD) TiAlN coated tungsten carbide/cobalt inserts vis-à-vis uncoated tungsten carbide/cobalt insert in turning of Ti-6Al-4V. Cutting forces were monitored during turning and tool wear was measured after turning experiments. The results showed that the performance of coated inserts was either comparable or poor than uncoated insert; and in no case, coated inserts performed better than uncoated insert. Although commercial recommendations are in place to use PVD coated inserts for enhanced machinability of titanium alloys, the use of coated inserts is not justified keeping in view the energy spent in coating and insignificant improvement in performance.     

不同槽型铣刀片的切削温度场分析

对三种槽型的铣刀片进行了切削温度试验 ,根据切削条件建立了温度场有限元分析的边界条件 ,并对不同槽型铣刀片的三维温度场进行了有限元分析 ,为铣刀片槽型的设计和优选提供了参考依据     

Ni基、Ni-W基涂层刀片加工高强度钢的切削性能研究

用新研制的Ni基、Ni W基涂层刀片与未涂层刀片进行了高强度合金钢的对比车削试验和切削性能研究 ,结果表明 ,新型涂层刀片切削性能良好 ,磨损较小 ,耐用度提高。通过适当研磨Ni基涂层刀片的前刀面 ,可有效提高刀片涂层的抗剥落能力