用切削法实现焊管去除内毛刺的关键技术研究

中、小直径直缝焊管去除内毛刺较为困难,本文给出了一种用切削法实现焊管去除内毛刺的方法,用环形刀块切除内毛刺,气压监控装置实时检测加工残余高度,并通过液压伺服动态调节刀具切削深度。最小工作焊管直径30mm,去除毛刺的残留最大高度为0.045mm,所建立的去除内毛刺系统加工精度高,使用稳定可靠。     

高频直缝焊管内毛刺清除装置研究

高频直缝焊管是一项比较常见的材料，其在生产的过程中非常关注毛刺清除工艺，避免影响焊管的应用效益。采用内毛刺清除装置保障高频直缝焊管的性能和质量，防止出现材料缺陷，而且内毛刺清除装置的效率比较高，严谨处理了高频直缝焊管的内毛刺。因此，本文通过以高频直缝焊接管为研究背景，重点分析内毛刺清除装置。     

新型直缝焊管内毛刺清除装置的研究

内毛刺清除是焊管生产技术中的重要环节,它是生产石油专用管,其他高强度、高精度焊管的关键工序。本文对中小直缝焊管内毛刺清除中的问题进行了分析,介绍了一种新型的拉刀内毛刺清除装置,使残余毛刺高度降至0.05～0.1mm。     

去除毛刺的工具

我厂去除管子的内孔毛刺一般用钻头在车床上加工,而外圆毛刺在砂轮上磨掉。这样,既费力又费时。下面介绍去除管子内孔及外圆毛刺的工具。     

活塞去毛刺新技术

提出了活塞去毛刺采用行星运动机构，活塞垂直安置在滚筒内，由工件及磨料的运动彻底地去除毛刺；用于曲拐的去毛刺，增加过渡齿轮的方法，可使滚筒中内、外侧加工零件的公转及自转力矩相近，并使磨料对其工件磨削、碰撞及刻划等微切加工，达到去毛刺均匀、彻底的目的。     

机械式直缝焊管内毛刺清除装置

详细介绍了一种机械式直缝焊管内毛刺在线清除装置,经实践检验,其结构合理,调整方便,刮削精度高,使用寿命长。     

机械零件毛刺控制及去除工艺现状

阐述近几年来机械制造领域中毛刺控制技术的研究成果及研究进展，列出了毛刺去除工艺的应用状况、新的去毛刺方法及其研究，并指出了去毛刺技术的发展方向。     

非金属零件相交小孔毛刺去除工艺研究

介绍了关于非金属零件相交小孔毛刺去除工艺的研究,针对非金属零件相交小孔毛刺去除方法进行了多方面的试验,根据试验结果,在非金属零件相交小孔毛刺去除方法上开辟了一条新的途径——热能消融法,为非金属零件相交小孔毛刺去除研究提供了可借鉴的工艺.     

弹簧上座零件毛刺去除方法探析及设备开发

介绍了机械零件毛刺常见的去除方法,阐述了毛刺去除的重要性,分析了弹簧上座零件毛刺形成的原因,结合生产实践设计了一款结合冲裁和气动控制原理工作的毛刺去除装置并进行实际应用,效果良好。     

EXTRUDEHONE热能去毛刺——TEM

热能方法利用了燃烧的原理：在机器的燃烧腔内混合气体点燃，在短短时间内（0．02s）内产生高温（2500～3500℃）的能量，将工件表面的毛刺去除。保留在工件表面上很浅的金属氧化物通常可以在热处理或者阳极电镀时去除。一些工件在加工后可能需要进行清洗。     

如何对待机械加工过程中的毛刺现象

在现代机械加工过程中，毛刺现象直接影响产品质量。为了解决实际加工过程中的毛刺现象，应从工艺设计，刀具，加工过程，质量检验等方面进行控制，从而有效地避免毛刺现象的产生，提高产品质量和生产效率。     

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%.     

Cryogenic drilling of aluminum-based printed circuit boards: a review and analysis

Abstract

An aluminum-based printed circuit board (Al-PCB) is a composite material comprising a copper layer, an insulating layer, and an aluminum base layer. In the drilling of Al-PCBs, exit burrs are formed because of the plastic deformation of the remnant aluminum under high drilling temperatures. In this work, a new method using cryogenic media is suggested to prevent exit burrs in Al-PCB drilling. The effects of cryogenic media, such as cold air, supercritical carbon dioxide solvent (scCO₂), and liquid nitrogen (LN₂), on the drilling temperature, chip removal, tool wear and exit burr formation were observed and analyzed. The Al-PCB drilling temperature could be effectively reduced when drilling with cold air, scCO₂ or LN₂. The chip removal and tool wear could be improved when drilling with cold air or LN₂. The exit burr formation when drilling with scCO₂ or LN₂ was greater than that when drilling under cooling and cold air conditions. A cold air matching composite wood backup board (MW-0.5) could effectively control the exit burr formation within 20?μm. This is the first study on the effects of three different cryogenic media on PCB drilling and is expected to provide a good reference for the cryogenic drilling of PCBs.     

Development of artificial neural network models to study the effect of process parameters on burr size in drilling

Burr size at the exit of the holes in drilling is a quality index and hence it becomes essential to predict the size of the burr formed in order to cater to the demand of product quality and functionability. In this paper, artificial neural network (ANN)-based models have been developed to study the effect of process parameters such as cutting speed, feed, drill diameter, point angle, and lip clearance angle on burr height and burr thickness during drilling of AISI 316L stainless steel. A multilayer feed-forward ANN; trained using error back-propagation training algorithm (EBPTA) has been employed for this purpose. The input-output patterns required for training are obtained from drilling experimentation planned through Box-Behnken design. The simulation results demonstrate the effectiveness of ANN models to analyze the effects of drilling process parameters on burr size.     

Burr analysis in microgrooving

Microburr formation affects badly on product's quality, especially the finishing surface. Besides, deburring techniques on microcutting are almost impossible or high cost. Understanding burr formation phenomena and minimizing burr size in correlation with cutting conditions and material properties, in this case, are more appropriate. For the purpose of exploring the burr phenomena in micrometal cutting, two cases of burr formation in grooving micropatterns are introduced in the paper. The burr happens along the cutting direction—side burr—of prism pattern, and the other happens at the exit edge of the pattern in the cutting direction—exit burr—of pyramid pattern. Besides, the exit break off which occurs during the exit burr formation is also studied. The analytical solutions for predicting the burr and break off size in each case are also proposed and compared with experiments.     

普通冲孔与无飞边精密冲孔的瞬时间隙及对冲孔质量的影响

提出了瞬时间隙的概念 ,研究了瞬时间隙对冲孔剪口质量的影响 ,对普通冲孔工艺与精密无飞边冲孔工艺凸、凹模间的瞬时间隙进行了对比分析 ,认为普通冲孔时瞬时间隙不定常是造成剪口质量差的根本原因 ,而无飞边精密冲孔时凸、凹模间为负间隙 ,其瞬时间隙保持定常 ,因此可使剪口光洁剪切带长度提高 1.5倍 ,且冲制的孔无纵向飞边     

Influence of size effect on burr formation in micro cutting

Burr is an important character of the surface quality for machined parts, and it is even more severe in micro cutting. Due to the uncut chip thickness and the cutting edge radius at the same range in micro cutting process, the tool extrudes the workpiece with negative rake angle. The workpiece flows along the direction of minimum resistance, and Poisson burr is formed. Based on the deformation analysis and experiment observations of micro cutting process, the factor for Poisson burr formation is analyzed. It is demonstrated that the ratio of the uncut chip thickness to the cutting edge radius plays an important role on the height of Poisson burr. Increasing the uncut chip thickness or decreasing the cutting edge radius makes the height of exit burr reduce. A new model of micro exit burr is established in this paper. Due to the size effect of specific cutting energy, the exit burr height increases. The minimum exit burr height will be obtained when the ratio of uncut the chip thickness to the cutting edge radius reaches 1. It is found that the curled radius of the exit burr plays an important role on the burr height.     

Effects of cutting edge radius and fiber cutting angle on the cutting-induced surface damage in machining of unidirectional CFRP composite laminates

Carbon fiber reinforced polymer composite laminates are anisotropic, inhomogeneous, and mostly prepared in laminate form before undergoing the finishing operations. The edge trimming process is considered as one of the most common finishing operations in the industrial applications. However, the laminate surface is especially prone to damage in the chip formation process, and the most common damage mode is burrs. Burrs may increase cost and production time because of additional machining; they can also damage the surface integrity. Many studies have been done to address this problem, and techniques for reducing burr size in material removal process has been the focus of the research. Nonetheless, the combined effects of the cutting edge radius and the fiber cutting angle on the burr formation have seldom been conducted, which in turn restricts to find out the mechanism of burr formation. The purpose of the present paper is to study the particular mechanism that leads to burr formation in edge trimming of CFRP laminates and investigate the effects of fiber cutting angle and cutting edge radius on burr formation. The results indicate that the burrs are prone to form in the fiber cutting angle range of 0° < χ < 90° when a large cutting edge radius of the tool is used for both milling and drilling of CFRP composites.