准干式切削在深孔加工中应用的关键技术

在传统的深孔加工中,切削液的相关费用占加工总成本的比例很高,对环境的污染及对人体的伤害更为严重,因此,不使用切削液的干式切削加工或使用微量切削液的准干式切削加工是深孔加工技术的重要发展方向.基于对深孔加工特点的分析, 详细阐述了准干式加工在深孔加工中应用的关键技术,为准干式切削加工在深孔加工中的应用提供了较好的方法和指导.     

亚干式深孔加工中的低温冷风雾化技术

结合干式切削加工的特点和深孔加工的特性，提出了将干式切削技术应用于深孔加工的设想，制定了运用低温冷风冷却、排屑及切削液雾化润滑刀具的亚干式深孔加工方法，并对其工作原理及在深孔加工中的具体运用进行了系统的分析和探讨，从而使干式切削技术的应用范围更广泛。     

亚干式深孔钻削系统的研究

分析了对深孔切削加工现状,探讨了亚干式切削技术用于深孔加工的可能性和其方案设计、加工效果、应用前景.     

亚干式深孔钻削颤振试验研究

亚干式深孔加工的振动对加工质量有很大影响,主要是亚干式深孔加工的颤振.分析了亚干式深孔加工的颤振产生原理,并从理论上分析亚干式深孔加工中的颤振产生因素;然后通过试验的方法来分析和论证切削参数对亚干式深孔加工中的振动影响.最后通过对比的方法来分析加工中的颤振,来判断加工工况.     

亚干式深孔加工刀具技术

结合干式切削和深孔加工的特点,提出一种亚干式深孔加工解决方案,介绍了亚干式深孔加工系统以及深孔刀具的结构设计。通过切削试验,确定了适用的刀片材料,并对干、湿两种加工方式下刀具的切削性能进行了对比分析,设计了适用于亚干式深孔加工的切削刀具。     

风冷雾化深孔加工系统的研究

文章通过对风冷雾化深孔加工系统的介绍，提出了将干式切削技术应用于深孔加工的设想，并结合深孔加工的特点，对其装置厦其实际应用进行了系统的概述。     

亚干式深孔钻削系统及其试验分析

将亚干式切削技术与深孔加工技术相结合,在BTA内排屑深孔加工系统的基础上,采用风冷雾化排屑系统代替BTA系统中的切削液排屑系统,形成亚干式深孔加工系统,从而实现风冷雾化切削液对刀具进行冷却润滑和排屑的功能,以减少切削液的使用及环境污染。并在不同的切削用量条件下对亚干式深孔加工与BTA深孔加工的切削力进行了对比试验及分析。试验证明该系统在合理的切削条件下切削力和排屑情况要比BTA系统具有优越性。     

准干式深孔加工系统构建

综合多种现代绿色冷却润滑的优点,并结合深孔加工的特点,采用以油膜附水滴为冷却润滑介质,结合新型的负压抽屑装置和复合喷雾装置,构成准干式深孔加工系统.准干式深孔加工系统变传统的浇注式深孔加工为新型环保的半干加工,实现深孔加工的准干式切削,在深孔加工的环境污染和能源损耗的问题上有突破性进展.系统设计的主要部分包括复合喷雾装置设计、负压抽屑装置设计、绿色切削液研制以及MOL技术应用.     

MQL技术在内排屑深孔钻削加工中的应用

针对传统浇注式内排屑深孔钻削加工方法(BTA或DF)存在着切削液消耗量大、生产成本高、污染环境及危害操作者身体健康等问题,本文提出了将MQL技术(最小润滑技术)应用于内排屑深孔加工的方法(即亚干式深孔加工),并对MQL切削加工中切削液的作用与效果进行了分析。通过亚干式深孔钻削试验,确定出水溶性切削液具有良好的雾化效果,并且加工系统具有良好的冷却及排屑效果。针对刀具磨损较大等问题,提出了采用油液混合雾化以及低温冷风的方法,以提高刀具的润滑性和冷却效果。     

干式切削技术在现代制造中的应用及前景

叙述了干式切削的加工特点,阐述了目前常用的几种实现方法及适用场合,分析了必须解决的2个关键性问题即切削时的温升与切屑的快速排出.着重探讨实现干式切削加工与机床性能、刀具选择的关系,指出干式切削技术具有广阔的发展和应用前景.为进一步研究“绿色制造”的重要加工方法--干式切削技术提供一定依据与指导.     

高速干切削技术及其实现

在切削加工中大量使用切削液进行冷却、润滑，不但提高了加工成本，也带来了环境污染，消除这些问题的合理措施是采用高速干切削方式。提出了干切削技术的新内涵，分析了实现高速干切削的机床技术、刀具技术和工艺技术。通过该技术实现了绿色制造，保证了企业的经济效益和社会效益最优化。     

纯水喷雾冷却技术在万吨桨中孔及端面加工中的应用

在传统的工艺中万吨桨的中孔和端面都采用干式切削加工,这就存在切削区温度高,刀具寿命低的问题,使用纯水喷雾冷却技术可以较好地解决这一问题,并且纯水喷雾冷却还具有经济性好,绿色环保,加工表面质量好等优点.     

Cryogenic minimum quantity lubrication machining: from mechanism to application

Cutting fluid plays a cooling–lubrication role in the cutting of metal materials. However, the substantial usage of cutting fluid in traditional flood machining seriously pollutes the environment and threatens the health of workers. Environmental machining technologies, such as dry cutting, minimum quantity lubrication (MQL), and cryogenic cooling technology, have been used as substitute for flood machining. However, the insufficient cooling capacity of MQL with normal-temperature compressed gas and the lack of lubricating performance of cryogenic cooling technology limit their industrial application. The technical bottleneck of mechanical–thermal damage of difficult-to-cut materials in aerospace and other fields can be solved by combining cryogenic medium and MQL. The latest progress of cryogenic minimum quantity lubrication (CMQL) technology is reviewed in this paper, and the key scientific issues in the research achievements of CMQL are clarified. First, the application forms and process characteristics of CMQL devices in turning, milling, and grinding are systematically summarized from traditional settings to innovative design. Second, the cooling–lubrication mechanism of CMQL and its influence mechanism on material hardness, cutting force, tool wear, and workpiece surface quality in cutting are extensively revealed. The effects of CMQL are systematically analyzed based on its mechanism and application form. Results show that the application effect of CMQL is better than that of cryogenic technology or MQL alone. Finally, the prospect, which provides basis and support for engineering application and development of CMQL technology, is introduced considering the limitations of CMQL.     

基于复合喷雾冷却的TC4钛合金切削温度的研究

钛合金是一种典型的难加工材料,其热传导率低,切削过程温升大而易加剧刀具磨损。本文通过对TC4钛合金的车削试验,研究了在干切削和复合喷雾冷却条件下切削温度随切削速度、切削深度和进给量的变化情况。结果表明:切削温度随着切削速度、切削深度和进给量的增大而增大;采用复合喷雾冷却技术可在TC4钛合金车削过程中取得较好的冷却效果,切削温度明显低于干切削条件下的切削温度。     

Micro-drilling of Ti–6Al–4V alloy: The effects of cooling/lubricating

This paper presents a series of experimental investigations of the effects of various machining conditions [dry, flooded, minimum quantity lubrication (MQL), and cryogenic] and cutting parameters (cutting speed and feed rate) on thrust force, torque, tool wear, burr formation, and surface roughness in micro-drilling of Ti–6Al–4V alloy. A set of uncoated carbide twist drills with a diameter of 700 μm were used for making holes in the workpiece material. Both machining conditions and cutting parameters were found to influence the thrust force and torque. The thrust force and torque are higher in cryogenic cooling. It was found that the MQL condition produced the highest engagement torque amplitude in comparison to the other coolant–lubrication conditions. The maximum average torque value was obtained in the dry drilling process. There was no substantial effect of various coolant–lubrication conditions on burr height. However, it was observed that the burr height was at a minimum level in cryogenic drilling. Increasing feed rate and decreasing spindle speed increased the entry and exit burr height. The minimum surface roughness values were obtained in the flood cooling condition. In the dry drilling process, increased cutting speed resulted in reduced hardness on the subsurface of the drilled hole. This indicates that the surface and subsurface of the drilled hole were subject to softening in the dry micro-drilling process. The softening at the subsurface of drilled holes under different cooling and lubrication conditions is much smaller compared to the dry micro-drilling process.     

浅析静电冷却干式切削技术

静电冷却干式切削技术应用气体放电原理,将压缩空气离子化、臭氧化,在切削区域形成特殊环境,从而实现冷却润滑的一种干式切削方法。本文应用静电冷却装置切削钛合金,并与切削液冷却进行比较分析。试验表明:静电冷却可达到常规切削的加工效果,是一种很有前途的绿色加工工艺。     

气缸盖气门座锥面与气门导管孔的加工技术研究

从气门座圈与导管底孔的加工、定位方式及基准选择、专用复合刀具的应用、气门座圈的加工方式、刀具材料的选用、导管孔的加工及其冷却方式、切削参数等主要方面对气门座圈锥面与导管孔的加工技术进行深入研究,提出了提高加工精度、效率的途径。