表面镀膜刀具钻削试验研究

均匀镀覆镍-金刚石薄膜于刀具表面,以提高刀具基体的硬度并起保护作用,减轻磨损程度。选取难加工的碳纤维复合材料作为对象,以轴向力和扭矩为指标,进行钻削试验研究。得出结论:镀膜刀具的轴向力、扭矩和表面磨损不同程度地受钻削参数的影响;为减轻刀具的磨损并获得较好的加工质量,宜合理设定进给量、钻削速率等参数。     

芳纶纤维复合材料切削性能与刀具选用

针对芳纶纤维复合材料的性能,进行了相应的车削、铣削和钻削基础工艺试验。结果表明,该材料呈现出切削力大、切削热不易散发、切削刀具磨损剧烈、树脂基材料影响切削性能、加工缺陷多,质量不稳定等切削性能;提出了相应切削刀具材料的选用原则,即应采用高硬耐磨的硬质合金或金刚石刀具材料进行切削;提出了车削、铣削、钻削加工该复合材料的刀具应具备的结构形式和几何参数。     

用表面改性技术提高电镀金刚石工具的使用性能

分别用经表面改性和未经表面改性的金刚石微粒制备电镀金刚石工具。通过扫描电子显微镜观察工具的表面形貌。对陶瓷材料进行钻削加工,测试两种不同金刚石微粒所制备的工具的使用寿命及性能。结果表明:用经表面改性的金刚石制备电镀金刚石工具,金刚石与镍-钴镀层间的界限消失,并有一些分散的镍钴连接点生长在金刚石与镀层的结合面上,形成镀层与金刚石微粒间的金属键结合;其陶瓷材料去除体积是未经表面改性金刚石电镀钻头的1.6倍,明显提高了电镀金刚石工具的磨削性能和使用寿命。     

钻削工艺参数对氟金云母玻璃陶瓷材料去除率的影响

对氟金云母可加工玻璃陶瓷进行钻削加工,用扫描电镜观察材料的已加工表面,分析氟金云母玻璃陶瓷钻削加工特性,考察刀具材料、冷却条件、主轴转速、刀具角度等参数对可加工陶瓷材料去除率的影响.结果表明:刀具材料和冷却方式是影响玻璃陶瓷材料加工去除的主要因素.因为存在刀具的磨损,氟金云母玻璃陶瓷的钻削加工应选用硬质合金刀具,而不选用高速钢刀具.采用冷却可以大幅提高加工效率.选择适当的钻削工艺参数,可以提高氟金云母玻璃陶瓷的材料去除率.     

CFRP旋刨刀具钻孔的可行性实验研究

CFRP是典型的难加工材料,特别是钻削直径d≥8 mm的孔。探究性设计了一种新型钻削CFRP的旋刨刀具,基于对旋刨刀刀具、麻花钻、套料钻进行的钻削实验,在不同的主轴转速和进给速度下,得到三种刀具轴向力的大小,然后利用MATLAB分别拟合出三种刀具的经验公式,并分析对比不同的转速和进给速度下轴向力对三种刀具的影响。结果表明旋刨刀刀具对CFRP制孔效果更优。     

ZrO2/CePO4可加工陶瓷材料钻削加工的试验研究

分别用高速钢刀具和硬质合金刀具对ZrO2/CePO4可加工陶瓷材料进行钻削加工试验.通过比较ZrO2/CePO4陶瓷和低碳钢材料的加工过程,分析了ZrO2/CePO4陶瓷的加工特性、材料钻削规律及其影响因素.实验结果表明:刀具的磨损是ZrO2/CePO4钻削加工的主要特征之一.钻削ZrO2/CePO4陶瓷材料的去除过程可分为高效率和高磨损2个阶段,刀具材料影响ZrO2/CepO4可加工陶瓷材料的加工效率.可加工陶瓷的加工过程中,应选择合理的刀具参数和加工工艺参数,以获得良好的加工质量.     

高速切削刀具材料的开发与选择

介绍了高速切削加工技术所使用的高速钢刀具、陶瓷刀具、涂层刀具、超硬刀具的性能特点及应用,探讨了选择刀具所考虑的因素。     

粒子群优化神经网络的电镀金刚石套钻使用寿命预测

电镀金刚石套钻广泛应用各种加工领域,而套钻使用寿命受到多种因素影响,具有一定的非线性变化特点,为了准确预测电镀金刚石套钻的使用寿命,提出了基于粒子群优化神经网络的电镀金刚石套钻使用寿命预测模型。对电镀金刚石套钻使用寿命预测现状进行分析,针对BP神经网络参数优化问题,采用粒子群优化算法确定最优参数,建立电镀金刚石套钻使用寿命的预测模型,通过仿真实验对其有效性和优越性进行分析。实验结果表明,模型可以准确刻画影响参数与电镀金刚石使用寿命之间的变化关系,获得比对比模型更高的预测精度,实际应用价值更高。     

美国开发新型金刚石刀具材料

美国Kennametal公司开发的KD1405是一种纯金刚石刀具材料。它具有良好的韧性，可显著改善刀具的耐磨性，在用于连续车削及轻负荷断续车削、精铣和半精铣刀加工时，刀具寿命与PCD刀具相比，可提高100％～200％。KD1405材料是用来加工高耐磨的非铁族材料。金刚石材料采用CVD工艺制备，不含粘结剂。通过用等离子体焰矩法制造工艺，可获得纯金刚石的显微结构，其强韧性足以胜任铣削加工的要求。     

纤维增强复合材料钻削加工技术研究现状

纤维增强复合材料具有力学性能各向异性、导热能力差等特点,在钻削加工时,容易产生分层、撕裂等加工缺陷。综述了钻削轴向力、切削参数、刀具几何结构等对纤维增强复合材料钻削缺陷的影响,进一步分析了钻削加工技术的研究现状,提出合理的加工参数、刀具结构及新的钻削加工技术,对于提高钻削加工质量具有重要的意义。     

引进国外精密量具——美国塞规简介

简要论述了炭素行业石墨制品加工用机床发展历程，着重介绍引进美国测量圆锥形石墨电极螺纹孔精度用塞规的结构、工作原理、偏差计算、操作方法及优点，以供同行参考。     

新型陶瓷刀具的切削性能研究

本文研究了山东工业大学机械工程学院研制的新型陶瓷刀具材料（包括ＪＸ－２，Ｈ５，Ｈ１３和Ｈ２１等）分别切削铸铁（ＨＴ２０）淬火４５号钢和难加工材料ＧＨ９９时的切削性能，探讨了各陶瓷刀具的抗磨损能力，实验研究了切削速度和进给量对刀具磨损的影响，并对切削条件进行了优化。     

Effects of tool coating materials and coating thickness on cutting temperature distribution with coated tools

Coated tools are currently widely used tool technology in machining. The influence of tool coating on heat transfer has become an active field of research enjoying constantly increasing attention in the field of machining. This paper is devoted to the cutting temperature in machining H13 hardened steel with monolayer coated tools (TiN, TiAlN, and Al₂O₃) and multilayer coated tools (TiN/TiC/TiN and TiAlN/TiN). Equivalent composite thermal conductivity and thermal diffusivity of multilayer coated tools were calculated using the equivalent approach. The established heat transfer analytical models estimated coating temperature in turning. The effect of tool coating in steady and transient heat transfer was studied, as well as the cutting temperature distribution. It reveals that the tool coating material and coating thickness can influence the cutting temperature distribution of coated tool. Thermal conductivity of coating material affects the steady cutting temperature distribution, and thermal diffusivity of coating material affects the transient cutting temperature distribution of coating tools.     

Atomistic aspects of ductile responses of cubic silicon carbide during nanometric cutting

Cubic silicon carbide (SiC) is an extremely hard and brittle material having unique blend of material properties which makes it suitable candidate for microelectromechanical systems and nanoelectromechanical systems applications. Although, SiC can be machined in ductile regime at nanoscale through single-point diamond turning process, the root cause of the ductile response of SiC has not been understood yet which impedes significant exploitation of this ceramic material. In this paper, molecular dynamics simulation has been carried out to investigate the atomistic aspects of ductile response of SiC during nanometric cutting process. Simulation results show that cubic SiC undergoes sp³-sp² order-disorder transition resulting in the formation of SiC-graphene-like substance with a growth rate dependent on the cutting conditions. The disorder transition of SiC causes the ductile response during its nanometric cutting operations. It was further found out that the continuous abrasive action between the diamond tool and SiC causes simultaneous sp³-sp² order-disorder transition of diamond tool which results in graphitization of diamond and consequent tool wear.     

Enhancing cutting performance of Ti(C,N)-based cermet tools on nodular cast iron by incorporating high-entropy carbide

In this study, we investigated the cutting performance and wear mechanisms of Ti(C,N)-based cutting tools containing varying weight percentages (0%, 5%, 10%, and 15%) of high-entropy carbide (HEC) (V_0.2Nb_0.2 Mo_0.2Ta_0.2W_0.2)C phase, when used for turning nodular cast iron. According to the turning test results, the cermet cutting tools containing 0 wt%, 5 wt%, 10 wt%, and 15 wt% HEC phases demonstrated effective cutting lives of 402, 720, 632, and 465 s, respectively. The tool with 5 wt% HEC phase showed the best cutting performance. When cutting nodular cast iron with cermet cutting tools, the main wear mechanisms observed were diffusion, oxidation, adhesion, and abrasion on the flank surface, along with diffusion, oxidation, and abrasion on the rake surface. The results of this study indicated that (V_0.2Nb_0.2Mo_0.2Ta_0.2W_0.2)C could be adopted as an effective reinforced phase in the cermet cutting tools.     

磁化高速钢刀具的磨损性能研究

本文对非磁化和磁化高速钢刀具分别切削大理石和45号钢时的磨损性能进行了试验研究,研究了磁化对刀具抗磨损能力的影响规律,并初步探讨了刀具的磁化机理。     

Interfacial microstructure and resistance-temperature characteristics of Ti(C,N)-based cermet/LaCrO3–Y2O3 laminated composite

A laminated Ti(C, N)-based cermet/LaCrO₃–Y₂O₃ composite which is used for making smart temperature measuring cutting tool was prepared by spark plasma sintering. In this work, the interfacial microstructure and resistance-temperature (R-T) characteristics of double-layer and triple-layer structures with different layer thicknesses of LaCrO₃–Y₂O₃ were investigated, the mechanism of interfacial evolution and changes in R-T characteristics of double-layer composites prepared at different sintering temperatures were studied, and the temperature measuring performance of the smart tool was tested. The results indicated as the thermosensitive ceramic layer thickness was 1.5 mm, the laminated composites showed the best performance. For the double-layer structure, its starting measuring temperature was 457K, and the thermal constant B reached 14194K. Cutting tests showed the resistance of the smart tool fluctuated sharply with cutting time, and the resistance variation reached up to 2 × 10⁸Ω within 1 s, which indicated that the smart cutting tool had a short response time and high temperature measuring sensitivity.     

PowerMILL刀具路径的编辑

本文主要介绍编辑刀具路径的功能包括移动、旋转、镜向、裁剪、分割等操作。     

三面镗床自动控制系统设计

介绍利用欧姆龙CPM1A系列PLC改造机体生产线镗床电控系统的方法和调试过程,改造后,系统运行可靠,生产效率提高。     

电镀金刚石工具第二部分电镀金钢石工具实例

以典型的电镀金刚石工具为例，详细介绍了电镀金刚石工具的工艺流程与操作要点。主要介绍的工具有：钻咀（头）、磨盘、铰刀、磨头、磨轮、磨轴。同时介绍了插座式与叠装式夹具的构件规格与在上述各种电镀金刚石工具中的使用方法。