硬车削及其加工技术

本文论述了硬车削加工的特点，硬车削加工所需的条件，分析了硬车削应用不广的原因，指出硬车削是一种高效洁净的工艺方法，具有广泛的应用前景。     

硬车削及其加工技术

论述了硬车削加工的特点，硬车削加工所需的条件，分析了硬车削应用不广的原因，从而指出了硬车削是一种高效洁净的工艺方法，具有广泛的应用前景。     

硬车削技术及其应用

分析了硬车削加工的特点、硬车削加工所需的条件以及硬车削技术在生产中的应用，并对其关键技术进行了探讨，指出硬车削技术是一种高效、洁净的工艺方法，具有广泛的应用前景。     

精密硬车削代替磨削加工的试验研究

简要介绍了精密硬车削在轴承行业的应用,以7016AC/TAP4轴承套圈为试验对象,从试样的加工精度指标和表面完整性分析精密硬车削的特点,证明了在轴承零件加工中精密硬车削工艺代替磨削加工的可行性。     

陶瓷刀具在精密轧辊硬车削加工中的应用

在论述硬车削及其加工优点的基础上,提出了在精密轧辊加工中采用硬车削取代磨削的方法。通过对陶瓷刀具的选用、加工机床的选用、刀具结构、刀具切削用量等方面的优化配置,可以实现精密轧辊的加工要求。试验表明,陶瓷刀具在精密轧辊硬车削加工中的应用效果良好。     

绿色制造中硬车削技术的研究及应用

硬车削作为一种新型的绿色制造中的干切削加工技术,不仅能避免切削液对环境的污染,而且能大幅度降低产品的生产成本,它已成为金属车削加工发展的趋势之一.主要分析和研究了硬车削的定义、特点、加工条件及其实际应用.     

以车代磨的绿色工艺

硬态切削是指采用超硬刀具对硬度大于50HRC淬硬钢进行精密切削加工的工艺。通常金属加工中,切削加工一般为软加工,即零件淬火前进行的粗加工。随着高硬度刀具材料和机床的发展,硬态切削技术得到了大量应用,目前硬态切削技术主要是指硬车削技术,即"以车代磨",而硬态铣削工艺应用较少。硬车加工中,通常采用涂层硬质合金刀具、陶瓷刀具和立方氮化硼(CBN)刀具在新型车床或车削中心上对淬硬钢进行精密车削,取代粗磨甚至是精磨加工。与磨削相比,硬态     

超硬刀具及其在硬车削加工中的应用

综述了硬车削加工中不同超硬刀具材料的物理性能和切削性能，阐述了它们在不同领域应用的特点。指出采用超硬刀具进行硬车削是一种高效、洁净的工艺方法，具有广泛的应用前景。     

硬车削在滚动轴承套圈加工中的应用

分析硬车削的特点及加工条件,详细介绍了采用硬车削加工滚动轴承套圈时的机床设备、装卡夹具、刀具选择等参数的确定,采用正交试验法对试验中的切削速度、进给量和切削深度3参数的影响水平进行了分析,得出了以硬车削加工代替磨削加工的可行性。     

特大型调心滚子硬车削工艺试验探究

以某型风电轴承用特大型调心滚子为试验对象,制定硬车削工艺流程,在高精密数控机床上进行硬车削工艺试验.通过对硬车削和传统磨削两种工艺加工产品检测数据进行对比分析,验证了特大型滚子采用硬车削工艺加工的优势和可行性.     

Experimental study and evaluation methodology on hard surface integrity

The Taguchi method is adopted experimentally to investigate the surface integrity (surface roughness, residual stress, and thermal damage layer) of hardened bearing steel in hard dry turning, and the validation experiments are consequently performed. It was revealed that the value and effect sequence of optimal hard turning parameter varies with different objectives of surface integrity. However, it is quite difficult to select or determine the optimal combination of hard turning parameters. A hard-turned component performance, which reflects an integrated impact of surface integrity, should be fully recognized to resolve the inherent conflict in the selection process. Based on it, an evaluation methodology composed of four steps is proposed that surface integrity should be evaluated by the service/fatigue life of hard-turned components and therefore turning parameters. It bears significance for super-finish hard turning further application in respect that it provides an integrated approach for hard turning parameter optimization to achieve a superior surface integrity. Funded by the Ministry of Education of China- “985” of international cooperation project “Clean Manufacturing Technology”.     

高效实用化超声车削技术

提出了新型高效实用化超声车削设备开发思路和方案,成功开发了新型超声车削装置,使用新型超声车削装置对难加工材料进行了超声车削试验,为工业化应用奠定了基础。     

On the finite element modelling of high speed hard turning

The results reported in this paper pertain to the simulation of high speed hard turning when using the finite element method. In recent years high speed hard turning has emerged as a very advantageous machining process for cutting hardened steels. Among the advantages of this modern turning operation are final product quality, reduced machining time, lower cost and environmentally friendly characteristics. For the finite element modelling a commercial programme, namely the Third Wave Systems AdvantEdge, was used. This programme is specially designed for simulating cutting operations, offering to the user many designing and analysis tools. In the present analysis orthogonal cutting models are proposed, taking several processing parameters into account; the models are validated with experimental results from the relevant literature and discussed. Additionally, oblique cutting models of high speed hard turning are constructed and discussed. From the reported results useful conclusions may be drawn and it can be stated that the proposed models can be used for industrial application.     

PCBN刀具超声振动车削45淬火钢的切削力与温度研究

应用正交试验设计，通过PCBN刀具对45淬火钢进行的普通硬车削与超声振动硬车削的对比试验，研究切削用量在两种切削方式下对切削力和切削温度的影响规律。试验结果表明：在合理的切削速度下，采用小进给量和小切削深度时，超声振动硬车削的切削力和切削温度要比相应的普通硬车削小得多。     

精密硬车加工轴承套圈的表面完整性试验研究

针对磨削加工中套圈精密加工存在的不足,进行精密硬车削加工轴承套圈新工艺的开发,通过加工试验分析了精密硬车加工轴承套圈的表面完整性,探究了基准面平面度、刀具磨损量等工艺参数与加工精度的对应关系。基于精密硬车削套圈试样的表面粗糙度、沟道圆度、显微硬度、热损伤、金相组织、残余应力分布、加工效率等方面的研究,得出了精密硬车削可达到磨削加工精度的结论,且金相组织稳定,不易存在热损伤,具有可控的残余应力分布和较高的加工效率,有利于产业化生产高精密轴承。利用磁性卡盘装夹套圈,分析试样基准面平面度对精密硬车削套圈沟道圆度的影响,发现提高基准面平面度可以有效提高加工套圈的沟道圆度;分析了刀具磨损对硬车削套圈加工精度的影响,得出在精密加工阶段刀具磨损量是控制套圈圆度的重要监控工艺参数的结论。     

Modeling and analyzing the effects of air-cooled turning on the machinability of Ti–6Al–4V titanium alloy using the cold air gun coolant system

This study provides the mathematical models for modeling and analyzing the effects of air-cooling on the machinability of Ti–6Al–4V titanium alloy in the hard turning process. A cold air gun coolant system was used in the experiments and produced a jet of compressed cold air for cooling the cutting process. The air-cooling process seems to be a good environment friendly option for the hard turning. In this experimental investigation, the cutting speed, feed rate and cutting depth were chosen as the numerical factor; the cooling method was regarded as the categorical factor. An experimental plan of a four-factor (three numerical plus one categorical) D-optimal design based on the response surface methodology (RSM) was employed to carry out the experimental study. The mathematical models based on the RSM were proposed for modeling and analyzing the cutting temperature and surface roughness in the hard turning process under the dry cutting process and air-cooling process. Tool wear and chip formation during the cutting process were also studied. The compressed cooling air in the gas form presents better penetration of the lubricant to the cutting zone than any conventional coolants in the cutting process do. Results show that the air-cooling significantly provides lower cutting temperature, reduces the tool wear, and produces the best machined surface. The machinability performance of hard turning Ti–6Al–4V titanium alloy on the application of air-cooling is better than the application of dry cutting process. This air-cooling cutting process easily produces the wrinkled and breaking chips. Consequently, the air-cooled cutting process offers the attractive alternative of the dry cutting in the hard turning process.     

Analysis of tool wear and surface finish in hard turning

Hard turning is a profitable alternative to finish grinding. The ultimate aim of hard turning is to remove work piece material in a single cut rather than a lengthy grinding operation in order to reduce processing time, production cost, surface roughness, and setup time, and to remain competitive. In recent years, interrupted hard turning, which is the process of turning hardened parts with areas of interrupted surfaces, has also been encouraged. The process of hard turning offers many potential benefits compared to the conventional grinding operation. Additionally, tool wear, tool life, quality of surface turned, and amount of material removed are also predicted. In this analysis, 18 different machining conditions, with three different grades of polycrystalline cubic boron nitride (PCBN), cutting tool are considered. This paper describes the various characteristics in terms of component quality, tool life, tool wear, effects of individual parameters on tool life and material removal, and economics of operation. The newer solution, a hard turning operation, is performed on a lathe. In this study, the PCBN tool inserts are used with a WIDAX PT GNR 2525 M16 tool holder. The hardened material selected for hard turning is commercially available engine crank pin material.     

Surface Integrity and Machineability in Intermittent Hard Turning

Despite the large amount of research on hard turning, there are few results on intermittent hard turning. In this paper, the feasibility of internal intermittent hard turning has been investigated. First, the cutting tools with different cubic boron nitride (CBN) contents were evaluated, based on machineability: tool wear, surface roughness, and cutting forces. In the case of intermittent turning, low CBN content tools had better machineability than high CBN content tools. The depth of the machining damaged layer and the magnitude and distribution of residual stress were evaluated. The experimental results showed that intermittent hard turning can produce surface integrity which is good enough for replacing the grinding process.     

超声硬切削45淬硬钢的切削温度研究

与普通切削相比,超声切削工艺具有很多优点,可以有效地改善淬硬钢难切削的特点。在有限元软件MSC.Marc中,针对PCBN刀具超声硬切削和普通硬切削的特点,建立了二维正交热力耦合模型,对这两种状态下的切削温度进行分析比较,发现超声振动状态下的切削温度明显低于普通状态;并且切削温度随切削深度及切削速度的增加而升高。仿真结果与单因素试验结果具有较好的一致性。