小直径深孔镗刀

国内φ40,φ50小直径液压缸体多采用粗镗→浮动精镗→滚压加工工艺。但由于原小直径深孔镗刀结构上存在较多问题,造成缸体质量不稳定,加工成本高。作者没计了一种新型小直径深孔镗刀,经过生产实践,效果良好,既降低了生产成本,又提高了产品质量。     

一种非标深孔镗刀的设计

针对深孔加工技术中存在的一些问题,在现有技术的基础上对镗刀的结构进行了改进,设计了一种非标深孔镗刀。改进后的镗刀加工表面粗糙度较小且精加工无需对刀,从而减少了刀具磨损。     

深孔镗挤刀

如图１所示零件是摩托车前减震器的滑套,材料为压铸铝合金。其中深孔加工是该零件加工的关键工序,为使该工序加工能符合整个生产线的节拍,保证设计要求,必须设计结构合理、性能优良、制造简单的专用刀具。我厂参考了大量深孔加工刀具资料,结合零件自身结构要素,配合专用组合加工机床,设计了深孔镗挤刀。如图２所示,该刀具安装在冷却排屑装置上（结构类似ＢＴＡ系统）,成功地加工出合格的零件,且加工效率高,刀具寿命长,具有明显的经济效益。一、刀具结构及几何参数１．刀片材料牌号采用ＹＡ６,用该材料制作的刀片切削压铸铝合金…     

深孔镗挤刀

如图1零件是摩托车减震器上的滑套,材料为压铸铝合金。其中深孔加工是该零件加工的关键工序,为使该工序加工能跟上整个生产线的节拍,必须设计结构合理,性能优良,制造简单的专用孔加工刀具。我们参考了大量深孔加工刀具资料,结合零件自身结构要素,配合专门设计的组合加工机床,设计     

深孔镗刀CAD软件的设计

利用VB进行AutoCAD的二次开发,进行深孔镗刀的软件设计,通过本软件使这种类型的刀具设计、参数计算变得简单而方便。     

大直径深孔镗刀国产化设计

提高大直径精密零件深孔加工的生产率和加工精度是深孔加工中的一项重要问题。本文通过对瑞典Ｓｏｎｄｖｉｋ深孔镗刀的结构分析，设计了两种类型的大直径深孔镗刀，并通过生产应用，取得了良好的效果。     

可转位深孔镗刀

本文介绍一种新型深孔镗刀，用于热轧无缝管的粗镗及半精镗加工，镗孔尺寸精度可达ＩＴ９～ＩＴ１１级，表面粗糙度可达Ｒ．６．３～Ｒａ３．２μｍ，孔的直线度在０．１０～０．１５ｍｍ／ｍ，并通过切削实验，优选合适的刀片材料和几何参数，推荐合理的切削用量，应用此项研究成果加工Φ２００ｍｍ长度为３ｍ的２７ＳｉＭｎ调质钢缸筒，取得较好效果。     

深孔加固式背镗刀

通常在数控车床上加工汽车轮毂的两轴承孔时,为了保证两轴承也的同轴度,常采用正镗孔和背镗孔相结合的方法。由于轮毂的背镗孔较深,标准刀具受力有限,加工中易产生振动,影响了加工质量。为此我们通过增加刀具刚性、制作特殊深孔     

利用浮动镗刀反向进给镗削深孔

1.深孔件的加工特点 (1)加工零件其长度与直径之比为L/D≥5。 (2)深孔加工时,孔轴线容易歪斜,钻削中钻头容易引偏。 (3)刀杆受内孔限制,一般细而长,刚性差,强度低,车削时容易产生振动和让刀现象,使零件易产生波纹、锥度等缺陷。     

可转位深孔镗刀

本文介绍了一种新型深孔镗刀，用于热轧无缝管的粗镗及半精镗加工，镗孔尺寸精度可达IT9－IT11级，表面粗糙度可达Ra6.3-Ra3.2μm，孔的直线度在0．10－0．15mm/m，并通过切削实验，优选合适的刀片材料和几何参数，推荐合理的切削用量，应用此项研究成果加工Φ200mm长度为30m的27SiMn调质钢缸筒，取得较好效果。     

Development of a practical high-performance laser-guided deep-hole boring tool: Improvement in guiding strategy

In this study, a practical laser-guided deep-hole boring tool with a diameter of 110 mm is fabricated with a view to preventing hole deviation. Thus far, it has not been possible to control and guide the boring tool at all times during the boring process because current tool guiding approaches are not sufficiently reliable. This paper describes improvements in the following three main aspects of boring tool operation: (1) the method of impressing voltage to piezoelectric actuators used for controlling the tool position and inclination; (2) speed of actuator response; and (3) guiding strategy. After the improvements are incorporated, boring experiments are carried out using duralumin workpieces to examine the performance of the new boring tool. The experimental results show that the tool can be controlled and guided at all times. Further, the guiding accuracy of the boring tool is within a range of ±20 μm for two lines on both sides along the guiding axis, and the holes are bored along the guiding axis within a straightness range of ±25 μm, even when prebored hole having a thin part on one side of the hole wall is used.     

Development of a deep-hole, laser-guide boring tool: the boring of workpieces with a thin wall and an inclined prebored hole

A laser-guided BTA tool has been developed to prevent axial hole deviations. Four kinds of experiments were conducted to examine the performance of this tool in detail and to determine its practical application using a duralumin (A2017-T4) workpiece with a prebored 108-mm diameter hole. The first experiment was performed to examine the conditions of the hole deviation in the case of normal deep-hole boring. The second was to examine whether the tool corrects for the stated hole deviation. The third was to examine whether the tool can go straight through to the target without shifting toward a thin wall (t = 0.7 mm) on one side of the workpiece. The fourth was to examine whether the tool can be guided toward the target without affecting a prebored hole, which was inclined to radial direction at 100 μm for a hole length of 100 mm. The experiments were performed with a rotating tool-stationary workpiece system. Rotational speed was 270 rpm and feed ws 0.125 mm/rev. Tool diameter was 110 mm. The results show that the tool can be guided to go straight through toward the target despite the disturbances.     

Development of a high-performance laser-guided deep-hole boring tool:: Optimal determination of reference origin for precise guiding

A laser-guided deep-hole boring tool using piezoelectric actuators was developed to prevent hole deviation. To extend the depth of controllable boring further, the following were improved. The tool’s guiding error, caused by misalignment of the corner cube prism and the mirror in the optical head from the spindle axis, was eliminated using an adjustment jig that determined the reference origins of the two position-sensitive detectors (PSDs) precisely. A single-edge counter-boring head is used instead of the double-edge head used up to now. The former was thought to be better in attitude control than the latter. A new boring bar, which was lower in rigidity and better in controllability of tool attitude, was used. Experiments were conducted to examine the performance of the new tool in detail and to determine its practical application, using duralumin (A2017-T4) workpieces with a prebored 108-mm diameter hole. The experiments were performed with a rotating tool–stationary workpiece system. Rotational speed was 270 rpm and feed was 0.125 mm/rev. Tool diameter was 110 mm. As a result, controlled boring becomes possible up to a depth of 700 mm under the stated experimental conditions. 700 mm is the maximum machinable length of the machine tool. The tool can be put to practical use.     

深孔加工刀具状态监测的研究

通过应变式传感器和振动传感器采集力与水平振动信号 ,提取了切削力信号的四阶中心矩和水平振动信号的特征频率谱峰 ,并将模式识别技术应用于刀具状态监测 ,利用感知器算法得到刀具状态的分类函数进行刀具状态识别 ;试验结果表明 ,该方法具有较高的识别精度和较强的抗干扰能力     

新型切粒刀的研制确定

对高压聚乙烯挤压造粒机所切颗粒出现的质量问题进行分析,找出产生的原因,提出改进后新切粒刀的设计和制造方案。经过较长时间实际使用,取得显著的经济效果。最后对新设计的切粒刀进行理论分析。     

新型深孔镗削刀具

与外圆和端面加工相比较,内孔镗削容易产生各种故障。在加工过程中,刀片切削刃在孔内部,肉眼无法观察,因此不易查明故障起因,这将给操作者带来诸多不便。内孔加工主要的故障是由颤振和排屑不良而引起的加工表面质量下降和刀具崩刃、折断等。其中,颤振是重要的原因之一。颤振的产生缘于刀具伸出长度与刀杆直径之比（L/d）过大,刀具刚性不足。另外,镗刀和钻头不同,钻头有两个切削刃参加切削,是一种相对平衡的刀具,而镗刀则是一个切削刃参加切削,即所谓单点切削刀具,因此受挠曲和扭转性能的影响十分明显,极易诱发颤振。     

一种新型空气锤差动镗缸机

空气锤镗缸常需大型或专业化镗缸设备,一般小企业需由专业修理单位协作,周期较长,费用较高,我们设计了一种变位齿轮差动镗缸机,使用方便,效果较好。 一、镗缸机的结构原理与使用 1． 结构原理 如图1所示,刀具固定于导向轴1上。电机驱动蜗杆5、带动蜗轮4,通过U形键带动丝杆8转动,丝杆和导向轴由对盘连结成为一体,使导向轴获得旋转运动。 蜗轮5和齿轮6（m＝2．5mm,z＝100）借U形键装在丝杆上一起旋转,齿轮7（m＝2．5mm,z＝99,x＝0．5）通过螺纹T85×12旋合于丝杆上,与齿轮6接触。 蜗轮4和齿轮6一起旋转时,带动齿轮9（m＝2．…     

刻线加工的新刀具——刻线插齿刀

介绍了一种在插齿机上加工度数环用的刻线插齿刀。这种刻线插齿刀解决了在普通铣床上用分度头加工时劳动强度大、生产效率低以及分齿精度达不到技术要求的问题,具有一定实用性。     

A programmable boring head with a bore diameter measuring tool tip

A novel boring head is described which has two built-in modes of operation. The first mode is the boring mode and enables the tool tip to bore over a diametrical range of 0.4 mm. The second mode is the measuring mode which turns the boring head into a bore radius measuring instrument. This is carried out by using the tool tip as a touch trigger probe.The head, which contains a battery powered microcomputer, first machines a pilot bore in boring mode and then reverts to measuring mode to determine the error from the target diameter. The head then returns to the boring mode and compensates for the error. The head is tool changeable, easily retrofittable to CNC machining centres and is fully programmable by the machine computer. The purpose of the device is to eliminate the tool change cycle time required for the use of a separate tough trigger probe. A calibration method is described which sets up the accuracy of the measuring mode. Boring test results are given which show that the device bores to a diametrical accuracy of 13 μm and less.