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我厂承按的φ5.64M盾构掘进机中的单级千斤顶油缸,内孔φ250×1873(mm),35钢(见图1),毛坯系实心锻件。为高效完成这一难度较大的油缸加工,我厂自行试剂了一整套深孔套料装置和不重磨深孔套料钻,今分述如下。一、深孔套料装置和不重磨套料钻深孔套料装置安装在C650车床上,见图2。套料钻采用外排屑方式,并采用了硬质合金不重磨刀具,故可选用较高的切削速度,从而大大提高了生产效率。套料钻的结构见图3所示。其切削部分由 相似文献
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张鹤祥 《中国制造业信息化》1998,(4)
0引言一般孔的长度与直径之比(L/D)超过5倍时称为深孔,超过20倍到30倍时属中等深孔。深孔加工时存在许多特殊问题,如不能直接看到刀具切削情况、切削热不易扩散、排屑困难、生产效率低等。常用的深孔加工方法有外排屑深孔钻、内排屑深孔钻、喷吸钻及板钻等。上述加工方法存在着不同程度的加工效率低、钻头形状较复杂、原材料浪费大等缺点。深孔套料加工是应用中空的套料钻及钻杆套钻工件,切削区为一环形带,套出的料芯位于钻杆孔中;加工时从钻杆后端输入大量具有一定压力的切削液,即冷却切削区,再把切屑从工件内孔与钻杆外壁之间的… 相似文献
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从多齿套料钻的结构形式出发,阐述了焊接式、机夹焊接刀块式和可转位机夹式三种套料钻在深孔加工中的应用情况及加工特点,为大直径深孔加工多齿套料钻的使用提供了一定的选用依据。随着大直径深孔的加工比重的日益增加、加工孔的直径的增大、孔长度的增长以及被加工零件外形种类的日益增多,套料钻作为一种省料、高效、省能源的深孔加工刀具必将... 相似文献
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将亚干式切削技术与深孔加工技术相结合,在BTA内排屑深孔加工系统的基础上,采用风冷雾化排屑系统代替BTA系统中的切削液排屑系统,形成亚干式深孔加工系统,从而实现风冷雾化切削液对刀具进行冷却润滑和排屑的功能,以减少切削液的使用及环境污染。并在不同的切削用量条件下对亚干式深孔加工与BTA深孔加工的切削力进行了对比试验及分析。试验证明该系统在合理的切削条件下切削力和排屑情况要比BTA系统具有优越性。 相似文献
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对切削液的类型和功能进行阐述,比较几种切削液的功能和切削特点,根据内排屑深孔加工的特点和对切削液的要求,选择几种乳化型切削液进行钻削试验。通过对比试验及结果分析,确定出能适应深孔钻削加工的乳化型切削液,可以满足深孔钻削加工中对刀具的冷却润滑和排屑效果,从而可以减少对切削油的使用,降低生产成本及对环境的污染。 相似文献
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准干式切削在深孔加工中应用的关键技术 总被引:2,自引:0,他引:2
在传统的深孔加工中,切削液的相关费用占加工总成本的比例很高,对环境的污染及对人体的伤害更为严重,因此,不使用切削液的干式切削加工或使用微量切削液的准干式切削加工是深孔加工技术的重要发展方向.基于对深孔加工特点的分析, 详细阐述了准干式加工在深孔加工中应用的关键技术,为准干式切削加工在深孔加工中的应用提供了较好的方法和指导. 相似文献
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深孔加工效率低、质量差、劳动强度大,主要原因是排屑困难。钻头切削性能再好,排屑不好,还是无济于事。近半个世纪时间里,人们一直在想方设法改善或解决深孔加工中的排屑问题,枪钻和内排屑深孔钻是利用切削液的推力将切屑推出孔外,排屑能力强,但要求切削液压力高,密封复杂,需要专用设备。六十年代初,瑞典发明了喷吸钻,巧妙地利用了切削液高速流动时产生的真空效应将切屑吸出。切削液压力低,不必密封,不要求专用设 相似文献
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Roundness modeling in BTA deep hole drilling 总被引:1,自引:0,他引:1
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. 相似文献
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Lei Zheng Baowei Wang Baofu Feng Chao Gao Juntang Yuan 《The International Journal of Advanced Manufacturing Technology》2011,56(5-8):421-427
Laminated ceramic composite armors made of engineering ceramics, fiber-enforced composite, and lightweight alloy are expected to be used widely in armor protection area. However, secondary machining is still a problem for the distinct properties of composing materials, and up to now, few reports can be found out about machining technology. In this work, an experimental study on drilling a typical laminated ceramic composite armor by using a special sintering diamond thinwall trepanning tool has been carried out deeply. To improve the machining efficiency, process parameters including the spindle speed and the axial force have been optimized through drilling experiments. Moreover, the three phases of the whole drilling process of the typical ceramic composite armor is proposed, and the machining mechanism and chip forms in each phase have been analyzed. Also, diamond tool skidding phenomena whether at hole exit or during drilling middle engineering ceramics have been explored, and the skidding mechanisms are presented. In addition, the surface quality of a hole wall machined has been studied, and an advisable measure is given. Results achieved in this paper can provide a technical base for diamond trepanning tool drilling similar laminated ceramic composite armors. 相似文献
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F. Tagliaferri S. Genna C. Leone B. Palumbo G. De Chiara 《The International Journal of Advanced Manufacturing Technology》2017,93(9-12):3203-3210
In the present study, fibre laser microdrilling of NIMONIC®263 sheet is investigated through an experimental testing campaign. Design of experiments (DOE) and analysis of variance (ANOVA) are applied with the aim to study the influence of the process parameters on the hole geometry and metallurgical properties. The results show that the laser allows drilling ~0.4-mm-thick NIMONIC®263 sheets with a trepanning speed up to 600 mm/min, obtaining good tolerance, low recast layer and absence of microcracks. 相似文献
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简要介绍了工程陶瓷材料的性能;选择了加工方式和工具材料;分析了套料加工原理;讨论了金刚石套料钻的结构及制作工艺,给出了套料钻的主要性能参数。 相似文献
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振动切削深孔加工初始偏差对孔直线度误差的影响 总被引:3,自引:0,他引:3
构建了振动切削深孔加工钻杆在轴向振动、振动切削力和切削液流体力影响下的多跨动力学有限元模型。引入自由模态综合技术,将钻杆线性自由度的特征模态进行缩减,仅保留具有非线性动力特征的模态,从而可有效降低耦合系统自由度数,减小计算量。利用该缩减后的模型,研究了辅助支撑位置和加工深度与孔直线度误差的作用关系,获得了孔直线度随初始偏差量变化的规律,为大跨度振动切削深孔加工机床的精度设计和加工误差分析提供了依据。通过试验与数值计算结果的对比,验证了所提出方法的有效性与准确性。 相似文献