液压阀加工中抑制毛棘生成的几种途径

本文介绍了金属切削加工中毛刺的定义和分类，并主要从零件设计、工艺路线、加工方法及刀具应用等方面阐述了抑制毛刺生成的基本思路和具体措施。     

少无毛刺切削技术的研究进展

在系统概述国内外少无毛刺切削加工技术研究进展的基础上,根据机械加工实际需要,给出了主动控制或减小金属切削毛刺的基本原则,探索出少无毛刺的主要途径。此外,分析了几种切削加工技术的具体应用。指出了目前尚需解决的一些主要问题,确立了今后深入开展金属切削毛刺研究的方向。     

金属切削毛刺数据库系统的设计

毛刺的产生和存在是金属切削加工中普遍存在的问题 ,它直接影响了工件的加工精度及质量。基于数据库和Java ,研究了金属切削毛刺数据库系统的设计 ,实现了切削毛刺数据的管理、切削毛刺类型与尺寸大小及加工参数的查询 ,进一步丰富和完善了金属切削毛刺的预报与控制理论。     

金属切削加工中的毛刺问题

毛刺是金属切削加工中产生的必然现象，它直接影响产品的质量，应从产品结构设计、工艺设计、刀具设计和生产管理等方面对毛刺加以控制。     

金属切削加工中毛刺问题的相关研究

毛刺现象是指机械加工过程中出现的各种不符合设计要求的部分,常见的包括飞边、飞溅、棱边和尖角等。在金属切削加工中,毛刺问题是影响金属切削加工的一个最重要因素,往往是由于焊接操作不符合要求或者加工过程中出现塑性变形等导致的。为了加强金属切削加工的质量,一定要加强人们对金属切削加工毛刺问题的重视,并采取各种措施预防毛刺的产生。本文就如何对待金属切削加工中的毛刺问题进行探析,提出了各种有效措施。     

铣削毛刺的形成及其控制

铣削加工是金属切削加工的主要方法之一,端铣是铣削加工中经常选用的加工方式。本文系统地阐述了影响端铣毛刺形成的主要因素,并从结构设计到制造加工全过程出发,探讨了减小和控制端铣毛刺的技术、工艺和方法。     

基于神经网络的金属切削毛刺专家系统的研究及应用

机械加工中毛刺的形成与存在影响、制约着精密与超精密加工和自动化加工技术的发展。基于神经网络理论,构建并开发了金属切削毛刺专家系统(Ujs),通过对神经网络的设计,并作为推理机制,以数据库为训练样本,建立了毛刺形态、尺寸与切削条件之间的映射模型,应用于金属切削毛刺的控制及预报。结合车削实验,比较了系统预报结果与实验结果,取得了较好的吻合。神经网络专家系统的建立为解决毛刺预报与控制提供了一条有效的途径。     

金属切削毛刺分类体系的研究及其应用

将金属切削毛刺生成同切削运动联系起来，提出并建立起切削运动－刀具切削刃毛刺分类体系，清晰地给出影响毛刺生成及变化的主要因素。将该分类体系应用于车削、钻削和磨削加工，表明切削运动－刀具切削刃毛刺分类体系定义明确、完整。简便易行。     

金属切削毛刺预报研究现状分析

阐述了金属切削毛刺形成预报研究的背景,并国内外学者的研究现状进行了分析研究,并且做出了比较,再在总结与归纳出金属切削毛刺预报的研究现状中尚存在的一些问题的基础上,指出在科技不断发展的现在,对金属切削加工技术的要求也越来越高,由于金属切削毛刺研究说涉及的领域很多,所以也给研究带了了新的机遇与挑战。最后指出了解决金属切削毛刺形成预报的关键问题和研究的发展方向。     

控制切削毛刺的基本措施

金属零件在切削加工过程中常会产生毛刺，毛刺的存在将严重地影响零件或产品的质量。影响毛刺生成的因素很多，如何防止和减少金属切削毛刺，应根据具体情况，采取相应措施。现就这一问题作一简要探讨性综述。一、从零件设计上避免生成毛刺1．选择合适的工件材料工件材料的物理机械性能对毛利的生成有很大影响，如变形硬化指数，延伸率，硬度和抗拉强度等。因此，在零件设计时，在满足强度要求的条件下，应尽可能的选用变形硬化指数和延伸率较小的材料，以减少金属切削加工时毛刺的生成。2采用合理的零件结构形状在金属切削加工中，毛刺主要…     

金属切削毛刺专家系统的研究进展

毛刺是金属切削加工中产生的常见现象之一,它的尺寸和形状直接影响到工件的尺寸精度和形位精度,甚至影响到工件的使用性能及其寿命.随着机械制造业朝着高精度,高效率和自动化方向发展,对切削加工精度的要求越来越高.由于专家系统具有数据结构化,数据和应用程序的高度独立性、数据共享,并将数据冗余减少到最小限度等优点,在金属切削毛刺形成研究与控制上逐步得到了越来越广泛的应用,对加工精度起到了很好的效果.在分析现有毛刺研究成果的基础上,与专家系统进行了对比与分析,体现出了专家系统在毛刺研究领域应用具有的优点,并阐述了现有的金属切削毛刺专家系统的研究现状,指出了尚存在的一些问题,从而为今后毛刺专家系统的发展提供借鉴.     

Effect of polar organic substance on burr formation in orthogonal cutting

The initiation of burr formation is characterized by the initial negative shear angle and the initial tool distance which are obtained from the minimum energy principle and energy conservation at the chip/burr transition point. Specially in this report the rollover burr is dealt as a specific case of the chip formation process in the final stage of cut, which the tool moves toward the end of workpiece. The purpose of this paper is to experimentally invesigate the burr formation mechanism near the end of cut by using a copper with various cutting conditions and tool geometries, and the influence of the surface active medium, that was used to reduce the burr size and improve the machinability, upon the mechanism of burr formation in the orthogonal cutting using the milling machine.     

基于毛刺的切削参数优化试验研究

金属切削中的毛刺是切削加工中产生的常见现象,它严重地影响产品的精度和使用性,有必要对毛刺的预测进行深入的研究。本文针对铣槽时产生的出口毛刺高度进行试验与检测,并通过田口直交表进行统计分析,对检测到的试验数据运用相关公式进一步进行计算优化,然后根据传统的经验值与优化计算的数据进行比较,获取了以毛刺高度为控制对象的切削用量优化值,以此为依据提出在加工过程中夹具、机床等相关的数据优化,为进一步对毛刺控制的非线性数学模型的建立提供试验数据。     

精密加工中切削参数对毛刺尺寸的影响

毛刺的产生是金属切削加工中长期存在的问题,在实验的基础上通过对精密车削中进给方向毛刺的研究,分析了切削参数对毛刺尺寸的影响,为毛刺生成机理的研究以及毛刺的抑制和去除做了部分基础性工作。     

微细铣削毛刺形成研究

微细铣削是在广泛材料范围内制造精密三维微小零件的一种柔性的、经济的加工方法,微细铣削的主要问题之一是有毛刺产生,对微细铣削过程中毛刺的形成及其影响因素进行实验研究与分析,得到微细铣削过程中各因素对毛刺形成影响的一般规律,在此基础上,通过合理地选择切削参数以及刀具路径规划,达到减小毛刺的目的。     

Investigation on the burr formation mechanism in micro cutting

It is desirable to minimize burr formation for improving part quality. This paper presents an investigation on the burr formation mechanism in micro cutting by taking into consideration the stress distribution around the cutting edge arc. The influences of the uncut chip thickness and the cutting edge radius on burr formation were investigated. Poisson burr is attributed to the side flow of the stagnation material at the bottom of the cutting edge arc. The stress distribution at the cutting edge arc has great influence on Poisson burr formation. The burr height decreases to the minimum value and then increases with reducing the uncut chip thickness due to the change of the maximum stress distribution. An optimum machining strategy also is suggested in micro milling of snake-shaped groove microstructure.     

Characterization and modeling of burr formation in micro-end milling

Mechanical micromachining is increasingly finding applications in fabrication of components in various fields, such as, biomedical devices, optics, electronics, medicine, communications and avionics. In order to ensure adequate functionality, there are stringent requirements for form and finish in case of biomedical devices like cochlear implants and metallic optics. This necessitates that the post machined surface must be burr free. To address these issues in micromachining, this paper presents results of an experimental study to investigate the influence of main process parameters i.e. speed, feed rate, depth of cut, tool diameter and number of flutes on the formation of the various types of burrs i.e. exit burrs and top burrs produced during micro-end milling operation. The experiments performed using Taguchi method shows that three types of burr formation mechanisms prevail during micro-end milling operations; these are: lateral deformation of material, bending and tearing of the chip. Also, three types of burrs were observed include: Poisson burr, rollover burr in down milling and tear burr in up milling. Further, it is observed that the depth of cut and the tool diameter are the main parameters, which influence the burr height and thickness significantly. However, the speed and the feed rate have small to negligible effect on the burr thickness and height. Besides the experimental analysis, the paper presents an analytical model to predict the burr height for exit burr. The model is built on the geometry of burr formation and the principle of continuity of work at the transition from chip formation to burr formation. Note that prediction of burr height in micro-end milling is extremely challenging due to the complex geometry of material removal and microstructural effects encountered during cutting at that length scales. The model fares well and the prediction errors range between 0.65 and 25%.     

Characteristics and mechanism of top burr formation in slotting microchannels using arrayed thin slotting cutters

This paper investigates the characteristics and mechanism of top burr formation, and the influence of cutting conditions on top burr formation in slotting microchannels on stainless steel (SS304L) using arrayed thin slotting cutters. Saw-like top burr that is a combination of Poisson part and tear part was observed in the experiments. A 3D finite element model was developed for analysis of the top burr formation processes. The mechanism of top burr formation was proposed based on a series of stress contours and the progressive deformation of microchannel edge obtained from simulation. The process of top burr formation can be divided into four stages: Poisson part initiation, Poisson part development, tear part formation and tear part toppling. The top burr height was found to be largely determined by feed and cutting speed, while the top burr width was found to be strongly influenced by cutting depth, feed and cutting speed.     

Experimental investigations of sideward burr formation in rotary machining

Burrs can be formed on the feed mark ridges and the edges of the machined parts in machining operations. These burrs are undesirable in terms of the surface quality, the precise dimensioning of the machined parts and the safety of operators. This paper demonstrates the effectiveness of using a rotary tool on minimizing the sideward burr formation in machining. In particular, the experimental relationships between the size of sideward burr and the cutting parameters (including tooling mechanism) are established first in rotary machining. Methods to control the size of sideward burr are then explained. The possible application of a rotary tool for deburring operations while engaged in machining is also explored.     

FE modeling of burr size in high- speed micro-milling of Ti6Al4V

This article is focused on the finite element modeling of burr formation in high speed micromilling of Ti6Al4V. Studies show that the burr produced at the up milling side at the exit of the micromilling tool is the biggest among burrs at other locations. Therefore, side exit burr at the up milling side has been modeled through finite element modeling. Johnson cook material constitutive model has been implemented in the formulation of burr formation. Experimental work has been performed to validate the developed model. It is found that the burr height and width obtained from the simulation has been validated experimentally with a maximum error of 15%. It was found from the literature review that the cutting speed is the factor, which influences the burr formation. Therefore, the model has been further extended to study the effect of cutting speed on the burr size. A maximum tool rotation of 200,000 rpm was considered with a tool diameter of 500 μm. It is predicted from the simulation that, the burr size was reduced by 96% (both height and width) if cutting tool speed was increased from 10,000 to 200,000 rpm. Therefore, it is concluded that the cutting speed is the major factor to reduce the burr size in micromilling of Ti6Al4 V. This study shows that the high speed micromachining center can be helpful in producing the micro parts with less or no burrs. It is expected that further extension of the burr formation model can minimize the burr size to zero/near zero size.