高速加工刀具系统动平衡

刀具系统在高速旋转下,系统的不平衡会产生很大的离心力,引起机床主轴和刀具系统的振动,影响被加工工件的精度和机床的磨损.因此研究高速加工刀具系统的动平衡技术是推广应用高速切削加工技术的重要内容.目前,许多国家都对高速加工工具系统进行研究,包括动平衡标准、动平衡方法、动平衡仪器等.刀具系统的动平衡与多种因数有关.研究表明未经过动平衡的刀具在转速较高时,离心力会引起刀具系统的变形,影响刀具和主轴寿命,同时对加工质量也会产生严重的后果.所以使用高速刀具必须经过动平衡.     

高速加工刀具的动平衡失稳

高速加工刀具的动平衡失稳问题是直接影响高速加工安全性的一个重要因素。基于系统稳定的观点，建立了高速回转件的动平衡失稳数学—力学模型，提出了计算高速回转件的动平衡失稳的临界转速新方法，论证了新方法的合理性，计算了几种典型高速加工刀具的动平衡失稳的临界转速，提出了解决动平衡失稳的主要措施。     

刀具动平衡技术的发展现状

速旋转刀具动平衡技术是高速切削加工的重要配套技术。介绍了转子动平衡原理在高速旋转刀具动平衡中的应用 ,综述了德国制定的刀具动平衡指导性规范、合理平衡质量等级的确定方法以及刀具在线平衡系统。     

904L不锈钢的高速铣削加工

针对904L不锈钢材料的切削性能,分析高速切削加工时刀具材料的选择、刀具结构的设计、刀柄系统以及刀具的动平衡,并进行铣削试验.为904L不锈钢的高速切削加工提供理论依据和实践参考.     

高速切削刀具的动平衡

高速切削不但要求刀具具有良好的耐热性、耐磨损性和抗破损性,同时对其动平衡质量也提出了严格要求。高速切削时,由于主轴转速很高,不平衡质量将引起非常大的惯性离心力,影响刀具寿命、加工精度和加工效率。对引起主轴－刀具系统不平衡的影响因素进行分析并介绍刀具的动平衡技术。     

帕莱克可调动平衡刀柄——3min内达到平衡

近年来，高速加工已成为切削加工的重要发展趋势之一。高速加工技术可获得显著的生产率与质量的提高，但同时高速加工对刀具的动平衡性能提出了更高的要求。如果刀具的动平衡性能不好，在高速转动时将受到很大的离心力作用，容易引起主轴及其他部件额外的振动，影响加工的质量，降低刀具的寿命，并对机床造成不可弥补的伤害。[第一段]     

高速加工刀具系统的动平衡

1.高速加工刀具系统的动平衡研究意义 高速加工是先进制造技术中实用性较为突出的关键性技术之一,是切削加工的主要发展方向。所谓高速加工,目前普遍认为机床主轴转速接近或达到10 000r/min以上,在切削速度、材料去除率、     

高速切削刀具技术

作为先进制造技术,高速切削技术能大幅度地提高加工品质和加工效率,并能降低加工成本.高速切削技术是机械制造业发展的必然趋势.而高速切削刀具技术则是实现高速切削的关键技术之一,笔者主要从刀具材料、刀具结构和刀具动平衡方面来阐述和分析该技术.     

高速数控加工用工具系统的发展

介绍了高速数控加工用工具系统在工具柄、夹紧技术、刀具材料、涂层材料、动平衡、安全性要求等方面的发展概况。     

高速切削的安全性研究

高速切削加工时,高速旋转刀具系统(刀刃、刀柄、刀盘、夹紧装置)承受着很大的离心力,积聚着巨大的能量。刀具系统的不平衡直接影响加工质量、刀具寿命和机床精度,降低刀具的连接刚度。当主轴转速达到刀具结构强度的临界转速时容易使刀具系统夹紧力失效,造成刀片和夹紧元件的甩飞和刀体爆碎。飞出的元件和碎片具有很高的动能,可能造成重大事故和人身伤害。因此,解决伴随着高速切削而出现的安全问题成为进一步推广高速切削技术的前提。1·高速切削刀具系统的动平衡引起高速切削刀具系统不平衡的主要因素有:刀具的平衡极限和残余不平衡度;刀具…     

现代高速切削与工具技术

高速加工和高效加工是目前获得高效机械加工生产率的重要手段，它在航空和航天产品的零件制造、模具制造以及汽车零部件制造等领域有较大的需求。机床采用高速传动技术、高速进给技术、高速切削刀具，配以大功率或大扭矩主轴系统以及复合加工技术，可实现高速加工与高效加工。近几年我国在机床高速化技术方面的研究开发取得了长足进步，并开发出相应的主机产品，为我国数控机床向高速、高效和精密方向发展奠定了基础。     

我国高速加工技术现状及发展趋势

高速加工是以较快生产节拍进行加工 ,提高切削和进刀速度是高速加工技术的重要环节。高速加工技术的发展涉及到零件毛坯、刀具、机床、自动控制与检测等多种技术的综合优化 ,需要变革传统的机加工工艺路线。我国引进的轿车零部件数控自动生产线上已广泛应用高速加工技术 ,其主要目的是在确保产品质量的前提下 ,尽量缩短零件的机加工工艺路线 ,加快生产节拍 (轿车发动机生产节拍已缩短为 30秒 ) ,满足轿车高质量、高速率、低成本、大批量、社会化生产的技术要求。高速加工技术必将带动零件毛坯制造、刀具 (工具 )、数控机床、自动控制、在线检测、材料等技术的发展与进步。随着我国制造业加快融入全球化生产制造体系 ,预计高速加工技术将在信息化、柔性化机械加工领域得到进一步发展和推广应用     

高速切削在现代模具制造中的应用

论述了高速切削在现代模具制造中应用及其应具备的高速切削机床、高速切削刀具和工艺。     

Integration of cutting force control and chatter suppression control into automatic cutting feed adjustment system design

Abstract

This study designed an automatic cutting feed adjustment system for computer numerical control (CNC) turning machine tools, which integrate the operational characteristics of cutting force control and chatter suppression control to shorten the machining time and maintain the quality of workpieces. The setting of appropriate machining conditions (such as cutting feed, spindle speed and depth of cut) to consider both machining quality and efficiency often causes difficulties for machine tool operators. Therefore, this study uses cutting force control to design an automatic cutting feed adjustment method for cutting tools, and then, the chatter suppression control design is used to modify the cutting force command to suppress cutting chatter. The experimental results of the CNC turning machine tool show that the use of the cutting force control to adjust the cutting feed can shorten the machining time; however, the cutting chatter results in larger surface waviness on the workpiece surface. When the cutting force command is properly modified by actuating the chatter suppression control, the workpiece shows better surface roughness with prolonged machining time. Therefore, the cutting tests demonstrate that the proposed system is feasible for satisfying the machining requirements of the manufacturing processes of mechanical parts for high speed and high accuracy.     

Experimental investigation of machining characteristics and chatter stability for Hastelloy-X with ultrasonic and hot turning

Ultrasonic-assisted machining is a machining operation based on the intermittent cutting of material which is obtained through vibrations generated by an ultrasonic system. This method utilizes low-amplitude vibrations with high frequency to prevent continuous contact between a cutting tool and a workpiece. Hot machining is another method for machining materials which are difficult to cut. The basic principle of this method is that the surface of the workpiece is heated to a specific temperature below the recrystallization temperature of the material. This heating operation can be applied before or during the machining process. Both of these operations improve machining operations in terms of workpiece-cutting tool characteristics. In this study, a novel hybrid machining method called hot ultrasonic-assisted turning (HUAT) is proposed for the machinability of Hastelloy-X material. This new technique combines ultrasonic-assisted turning (UAT) and hot turning methods to take advantage of both machining methods in terms of machining characteristics, such as surface roughness, stable cutting depths, and cutting tool temperature. In order to observe the effect of the HUAT method, Hastelloy-X alloy was selected as the workpiece. Experiments on conventional turning (CT), UAT, and HUAT operations were carried out for Hastelloy-X alloy, changing the cutting speed and cutting tool overhang lengths. Chip morphology was also observed. In addition, modal and sound tests were performed to investigate the modal and stability characteristics of the machining. The analysis of variance (ANOVA) method was performed to find the effect of the cutting speed, tool overhang length, and machining techniques (CT, UAT, HUAT) on surface roughness, stable cutting depths, and cutting tool temperature. The results show both ultrasonic vibration and heat improve the machining of Hastelloy-X. A decrease in surface roughness and an increase in stable cutting depths were observed, and higher cutting tool temperatures were obtained in UAT and HUAT compared to CT. According to the ANOVA results, tool overhang length, cutting speed, and machining techniques were effective parameters for surface roughness and stable cutting depths at a 1% significance level (p ≤ 0.01). In addition, cutting speed and machining techniques have an influence on cutting tool temperature at a 1% significance level (p ≤ 0.01). During chip analysis, serrated chips were observed in UAT and HUAT.     

高速切削的关键技术与研究展望

高速切削加工是先进制造技术的重要组成部分之一.综述了高速切削的优点、发展应用和关键技术,分析了其发展背景.着重分析了高速切削机床、高速切削刀具和安全装置与监控系统.展望了该领域今后的研究方向.     

Control of linear motor machine tool feed drives for end milling: Robust MIMO approach

Linear motors become promising for use as high speed, high accuracy machine tool feed drives. The cutting force in the machining process are directly reflected to the linear motor due to no gearing mechanism. To achieve highly accurate machining, the controller for the linear motor system should be designed to compensate for the cutting force.     

硬质合金刀具高速车削钛合金的切削性能研究

采用单因素试验法,用未涂层硬质合金刀具和TiAlN涂层硬质合金刀具对Ti-6Al-4V钛合金进行了高速干车削试验,通过对切削过程中切削力、刀具寿命、切削温度以及加工表面粗糙度的分析,得出了两种刀具高速干车削钛合金的切削性能,为钛合金高速切削刀具的设计提供了试验依据。     

高速加工切削用量选择分析

高速加工切削用量的选择主要考虑加工效率、加工质量、刀具磨损和加工成本。不同刀具加工不同工件材料时,切削用量会有很大差异。切削用量的选择是高速加工中的重要内容,切削用量的大小对加工效率、加工质量、刀具磨损和加工成本均有显著影响。本文对高速加工的切削用量选择问题进行了分析,给出了若干原则和建议。     

Influence of machining parameters on the machinability of particulate reinforced Al/SiC–MMC

The paper presents the result of an experimental investigation on the machinability of silicon carbide particulate aluminium metal matrix composite during turning using a rhombic uncoated carbide tool. The influence of machining parameters, e.g. cutting speed, feed and depth of cut on the cutting force has been investigated. The influence of the length of machining and cutting time on the tool wear and the influence of various machining parameters, e.g. cutting speed, feed, depth of cut on the surface finish criteria has been analyzed through the various graphical representations. The combined effect of cutting speed and feed on the flank wear has also been investigated. The influence of cutting speed, feed and depth of cut on the tool wears and built-up edge is analyzed graphically. The job surface condition and wear of the cutting tool edge for the different sets of experiments have been examined and compared for searching out the suitable cutting condition for effective machining performance during turning of Al/SiC-MMC. Test results show that no built-up edge is formed during machining of Al/SiC-MMC at high speed and low depth of cut. From the test results and different SEM micrographs, suitable range of cutting speed, feed and depth of cut can be selected for proper machining of Al/SiC-MMC.