小直径内排屑深孔振动钻削试验研究

振动钻削是解决小直径深孔加工难题的有效工艺方法之一。其钻削效果主要取决于振动系统的性能、钻头的设计和振动钻削工艺参数的选择。本文介绍了我们设计的新型振动系统和ＤＦ钻头,并对孔径φ６ｍｍ和φ８ｍｍ的深孔进行了振动钻削实验,效果良好。     

超细长小直径深孔振动钻削工艺

介绍了一种超细长外排屑深孔振动钻削系统,分析了外排屑DF系统加强排屑的机理,阐述了枪钻的选取与刃磨、钻削用量和振动参数的选取原则。用35CrMo进行了φ5.65×300mm钻削试验,结果表明只要参数选择得当就可以实现可靠断屑,使排屑顺畅,而且孔的精度很高。     

小深孔加工的振动钻削装置

介绍了一种具有三种不同振动方式的用于小深孔加工振动钻削装置的结构,特点及效果。     

实用化振动切削技术——超声振动钻削小深孔工艺及装备

在机械加工中，对孔的加工质量和加工效率要求不断地提高，若再加上在不断出现的难加工材料上进行孔的钻削加工，这就使采用传统的钻削工艺加工小深孔越加显出其局限性。本文研制一种超声轴向振动系统，并对合金铜进行试验。试验结果表明，超声振动钻削能很好解决小深孔加工的难题，有着广阔的应用前景。     

难加工材料小深孔的振动钻削

随着科学技术的发展,不锈钢、高强度钢、高温合金、高熔点金属及其合金、喷涂料料以及非金属等高参数材料的应用日益广泛。加工这类材料,切削温度高,刀具磨损大,采用的切削用量低。对于这些金属如何提高加工效率和质量已成为当今机械加工行业普通关注的问题。在这些材料上加工小直径精密深孔更是急待解决的实际问题。     

低频机械式深孔振动钻削装置的设计与应用

介绍了一种新型的用于小直径深孔钻削的振动装置的结构、特点及应用效果。     

小直径深孔振动钻削钻头的研究

分析了小直径深孔振动钻削对钻头的要求；设计了一种新型内排屑深孔钻头；分析了该钻头的结构和刃磨特点，进行了振动钻削试验。试验表明，合理匹配切削参数和振动参数，可实现断屑可靠且排屑顺畅，能钻出尺寸精度高、表面粗糙度参数值小、直线度较高的深孔。分析了用新型钻头进行振动钻削提高工艺效果的原因，表明该种钻头具有良好的工艺性能。     

化学复合电镀

介绍了一种化学复合电镀工艺。     

A miniaturised sensor for deep hole diameter measurement

A miniaturised displacement senor for deep hole measurement is reported in this paper. By exploiting the induced eddy current effects detected by chip coils, the sensor generates a ’digital’ signal. The sensor chip coil can be manufactured by the similar processes to those used for manufacturing a printed circuit board (PCB) which allows them to be miniaturised. The paper elaborates on the construction and mechanism by which the displacement is directly transferred to a frequency output. It also reports on the transducer, which uses two contact probes for transmitting the displacement to a noncontact sensing element. Experimental results demonstrate the stability, linearity, measurement range and accuracy of the sensor system.     

亚干式内排屑深孔钻削系统试验与分析

结合亚干式切削和内排屑深孔钻削加工的特点,提出亚干式内排屑深孔加工系统的设计思路。结果表明,该系统具有良好的排屑及冷却效果。同时,通过与湿式(BTA)钻削加工的试验对比及分析,在合理的切削用量下,亚干式钻削的切削性能在排屑及冷却方面要优于湿式(BTA)钻削。     

绿色干式深孔加工技术的研究

阐述现代干式深孔加工的优点与面临的问题,并就面临的问题进行分析和解决.在深孔加工方案解决中,对刀具的材料、结构及几何参数进行分析改进.通过试验得出结论,所述方案与传统方案比较不仅很少用切削液,而且刀面平均磨损量减少了十个百分点.     

深孔加工力学分析及钻削过程模拟

深孔加工是在封闭状态下进行的,不能直接观察到刀具的切削情况。采用了金属塑性成形仿真软件Deform-3D,用有限元方法动态模拟了深孔钻削过程,预测了加工过程中的温度及应力变化情况,比较了不同钻削参数下温度与等效应力的变化情况,获得了不同切削速度下切削温度及等效应力的变化曲线。分析结果表明:切削温度随切入深度的增加而增大,逐渐趋于平稳,最高温度出现在刀具和切屑接触的位置;切削温度与切削速度成正比,而等效应力随切削参数变化,变化并不大。     

Roundness modeling in BTA deep hole drilling

The modeling of deep hole geometry which was generated for boring and trepanning association (BTA) drilling was performed and its characteristics was discussed, also the effects of internally BTA drilled round profile are analyzed and its geometric modeling reliability was verified by the experiments of roundness testing, especially in BTA drilling operation. In this study, a harmonic geometric round model with the parameter of harmonic function was established. This relationship is also used to provide physical meanings to harmonic lobes generated by the proposed roundness model for a profile of BTA drilling, especially those caused by the spindle error motions of the BTA tool. In general, the theoretical roundness profile of a hole with an arbitrary multi-lobe can be calculated. But in real experiments, the two- to six-lobe hole profile was frequently measured. The most frequently measured one is three- and five-lobe profile in experiments. With these results, It was predicted that the reliability of proposed harmonic model has been verified theoretically and experimentally by a large number of real profile estimation of the hole and the experimental results that was produced by BTA drilling operation in deep hole making operation. This new modeling method is expected to provide desirable insights into the advanced tolerance analysis of circular hole making in BTA drilling process.     

基于ABAQUS的小孔钻削加工仿真

研究了小孔径深孔钻削加工过程中切削参数对零件变形及残余应力的影响,旨在获得不同切削参数下切削力和残余应力的变化规律。对钻削加工工艺分析的基础上,利用 ABAQUS有限元仿真软件,选择合适的材料模型和失效准则,设定多组切削参数,建立零件的三维钻削模型进行仿真。结果表明,根据仿真结果可优选合适的切削参数,并预测切削力,这为钻削的实际生产提供更直接的理论依据。     

应用振动钻削加工缝合针带线孔

针对医用带线缝合针带线孔的加工难点,采用振动钻削,并研究设计了一种轴向振动钻削装置.试验结果表明,所设计的装置可以明显改善医用带线缝合针带线孔的加工质量,提高合格率.     

特种材料深孔精加工工艺研究

为解决特种材料在深孔加工过程中出现振动较大且排屑不畅、而导致表面精糙度值达不列要求的问题,着重对影响表面粗糙度值的刀具前角、后角、走刀量、切削速度四个因素进行分析并通过实验进行验证,得到了刀具几何角参数和切削用量范围.结果表明,刀具的前角20°～35°、后角6°～12°、走刀量为0.07 ～ 0.12 mm且切削速度小于225 r/min时,可以保证特种材料深孔精加工的表面精糙度值.     

麻花钻钻削加工过程的有限元分析

对WC硬质合金麻花钻加工45#钢工件上孔的过程,用Deform软件进行了有限元分析。研究了加工过程中刀具的轴向力和扭矩随切削时间的变化规律,得到了工件最大主应力的分布区域。分析了麻花钻加工过程中的温度变化,得到了刀具和工件温度云图。研究结果为麻花钻实际加工切削用量的选择提供了参考。