超声振动切削不锈钢时刀具磨损与寿命的试验研究

本文对超声振动切削不锈钢进行了试验研究,分别就切削速度、进给量对刀具磨损的影响问题进行了论述,分析了振切时刀具磨损的原因,提出了减小磨损的一些措施。     

湿式超声振动切削时刀具磨损与寿命的试验研究

超声振动切削工业用特软材料,即使用细晶粒的硬质合金刀片,不加切削液时,刀具寿命提高的程度并不显著。为此,本文介绍了采用加切削液的湿式振切方式。经试验知,在本文条件下以采用低粘度的2号主轴油为佳,如取较大的刀具振幅(A)与较低的切削速度(V),可使湿式超声振切时刀具寿命有明显的提高。本文还探讨了超声振切时,切削液通过动态润湿、泵吸与油楔等作用方式,对刀—屑、刀—工界面起到了显著的缓冲与减阻作用。     

超声振动切割细胞系统的设计

根据细胞微切割实验对超声振动切割系统的要求,对夹心式超声换能器和超声变幅杆组成的振动系统进行了设计,超声换能器采用夹心式压电换能器,变幅杆是一种将等截面圆柱形阶梯变幅杆的一端替换成圆锥形变幅杆构成的新型复合圆锥阶梯形变幅杆,设计了超声换能器和变幅杆的基本结构,并给出其制造尺寸.     

黑色金属的金刚石超声振动切削

黑色金属的金刚石超声振动切削大连理工大学（１１６２２４）张元良刘欣方加宝董桂英陈懋圻迄今为止,在生产中,天然金刚石只能用于切削有色金属、塑料及某些晶体材料,不能加工钢铁等黑色金属。这是因为在切削黑色金属时,金刚石刀具的磨损极快,使切削难以持续进行。在...     

聚晶金刚石刀具振动切削不锈钢技术研究

使用聚晶金刚石刀具进行了超声波振动切削不锈钢的实验研究,研究了切削方式对切削力及已加工表面粗糙度的影响规律。通过对刀具磨损区微观形貌的观测,分析了PCD刀具切削不锈钢时的磨损机理。结果表明,化学磨损在金刚石刀具切削黑色金属时占主导地位。超声振动切削可明显减小切削变形、切削力及刀具磨损。     

高频超声椭圆振动精密切削

研制了一种新型的工作频率为147.5kHz的超声椭圆振动换能器,进行了高频椭圆车削硬铝(LY12)的试验。试验结果表明,在精密切削中,同普通切削相比较,高频椭圆超声振动切削对表面粗糙度具有负面影响,但具有降低切削力和提高加工精度的特点,而同低频(20.5kHz)椭圆振动切削相比较,在相同条件下,可采用较高的切削速度,从而提高了工作效率。     

Inconel 718合金超声振动切削质量与刀具寿命控制研究

超声振动切削UVC是解决难加工材料精细加工问题的理想方法。在对Inconel718合金同时进行UVC和传统车削法CT加工中,研究了切削参数（切削速度、进给量、切削时间）对刀具切削性能的影响。通过对刀具磨损、切屑形态和工件表面粗糙度的研究,发现在进行低速硬态切削时,UVC在切削表面质量和刀具寿命方面均优于传统车削加工。同时随着刀具－工件表面接触率TWCR的降低,刀具磨损和切削力随之降低,而工件表面质量和刀具寿命得到提高。     

超声振动切削SiCp/Al复合材料的刀具磨损试验

分别采用超声切削和普通切削两种方式对SiCP/Al复合材料进行了车削试验,研究了切削参数对硬质合金YG6刀具磨损的影响规律,并在同等条件下与聚晶金刚石(PCD)刀具进行了对比。发现超声切削的刀具磨损量要小于普通切削的刀具磨损量;超声切削时PCD刀具的磨损量约为YG6刀具磨损量的1/10,这点和普通切削十分相似。     

SiCp/Al复合材料超声振动辅助切削研究现状与进展

阐述了SiC_p/Al复合材料在切削过程中存在的一些问题,从SiC_p/Al复合材料超声振动辅助加工中的刀具材料与刀具磨损、切屑与切削力以及表面质量三个方面概述了SiC_p/Al复合材料切削加工的研究现状,对促进SiC_p/Al复合材料高效切削加工的措施进行了总结。     

金刚石刀具振动切削颗粒增强金属基复合材料的切削机理研究

金属基复合材料(MMCs)具有强度高、密度小的特点,可广泛应用于航空航天和汽车领域,但是这种材料的难加工特性限制了其进一步推广。采用超声振动切削可以降低切削力和切削热效应,对于难加工材料和难加工零件的精密加工具有特效[1]。本文采用金刚石刀具进行切削试验,对超声振动切削金属基复合材料的切屑形态、切屑变形系数和剪切角、切削表面微观形貌与粗糙度、加工表面残余应力及刀具磨损等几方面进行了深入的研究,并与非振动切削方法进行了对比。     

Analysis of regenerative chatter suppression with adding the ultrasonic elliptical vibration on the cutting tool

A method is proposed to suppress regenerative chatter in turning operation, in which the ultrasonic elliptical vibration is added on the cutting tool. It results in the fact that the cutting tool is separated periodically from the chip and the workpiece, and the direction of the frictional force between the rake face of the cutting tool and the chip is reversed in each cycle of the ultrasonic elliptical vibration. The experimental investigations show that the regenerative chatter occurring in ordinary turning operation can be suppressed effectively by applying the ultrasonic elliptical vibration on the cutting tool. In order to clearify the reason of the regenerative chatter suppression, theoretical analysis and computer simulation are performed on turning with ultrasonic vibration. There is a good agreement among the experimental investigations, theoretical analysis and the computer simulation.     

Development of a cutting tool condition monitoring system for high speed turning operation by vibration and strain analysis

Cutting tool wear is a critical phenomenon which influences the quality of the machined part. In this paper, an attempt has been made to create artificial flank wear using the electrical discharge machining (EDM) process to emulate the actual or real flank wear. The tests were conducted using coated carbide inserts, with and without wear on EN-8 steel, and the acquired data were used to develop artificial neural networks model. Empirical models have been developed using analysis of variance (ANOVA). In order to analyze the response of the system, experiments were carried out for various cutting speeds, depths of cut and feed rates. To increase the confidence limit and reliability of the experimental data, full factorial experimental design (135 experiments) has been carried out. Vibration and strain data during the cutting process are recorded using two accelerometers and one strain gauge bridge. Power spectral analysis was carried out to test the level of significance through regression analysis. Experimental results were analyzed with respect to various depths of cut, feed rates and cutting speeds.     

高速切削加工刀具材料的性能分析及合理化选择

阐述各种高速切削加工刀具材料的性能,并分析其物理特性和化学特性以及不同的成分合成对机械加工性能的影响.通过比较,并考虑切削刀具材料与加工对象的力学性能、物理性能和化学性能的匹配情况,合理地选择高速切削加工刀具的材料.     

干式切削刀具技术

干式切削技术作为一种绿色制造工艺,又是一项庞大的系统工程,需要从刀具技术、机床结构和工艺过程等各方面采取一系列的措施,而首当其冲的是切削刀具技术,设计干式切削刀具时,不仅要选择适用的刀具材料和采用的涂层,而且应当综合考虑刀具材料、刀具涂层和刀具几何形状之间的相互兼顾和优化.     

数控铣削加工曲面时刀具轨迹的研究

数控铣削加工曲面过程中,刀具的运动轨迹是影响加工质量的一个重要因素.研究了数控铣削加工过程中刀具轨迹的生成,以及不同轨迹形式对加工质量有何影响等内容.     

干切削技术及其新发展

从干切削机床、刀具和工艺方法三个方面对干切削技术及其最新发展进行了全面的论述.     

高锰钢切削刀具的设计

高锰钢切削极易产生硬化层,很难加工。在生产实践中,通过合理地选择刀具材料、刀具结构、切削用量等,可以很好解决高锰钢难加工的问题,保证了高锰钢的加工质量。     

超声振动切削超薄壁精密零件的粗糙度试验研究

对直径为 47.75mm壁厚为 0 .8～ 1 .5mm的照相机导向镜筒零件进行普通和超声车削试验 ,研究了各切削参数对此类超薄壁零件表面粗糙度的影响规律 ,也试验研究了超声振动切削时切削液及车刀对表面粗糙度的影响     

A study of ultrasonic vibration cutting of carbon fibre reinforced plastics

In the use of carbon fibre reinforced plastics (CFRP) it is often necessary to cut the components, but cutting CFRP is often made difficult by delamination of the composites and by the short tool life. In this paper, the machinability of CFRP by means of ultrasonic vibration cutting was experimentally investigated. The experimental results have led to a trial application of ultrasonic vibration cutting, which has been verified experimentally to be highly effective in view of cutting force and surface quality.     

Using workpiece vibration cutting for micro-drilling

The purpose of this paper is to investigate the effects of assisted vibration on the drilling quality of aluminium alloy (Al 6061-T6) and structure steel (SS41). In the past, research methodology of vibration drilling on small-diameter holes has mainly involved vibrating from the spindle side. In this paper, a new approach to obtain the desired vibration is proposed from the workpiece side, by a self-made, vibrating worktable. Through extensive experiments with a twist drill size of 0.5 mm, we found that hole oversize, displacement of the hole centre, and surface roughness of the drilled wall could be improved with the increase of vibrating frequency and amplitude. Roundness of the drilled hole could also be improved when high amplitude and proper frequency are imposed.