钻模钻孔位置误差分析

钻（扩）孔时,孔的尺寸精度主要取决于钻头直径和装夹精度,而孔的位置精度主要靠钻模来保证。图１如图１所示,在钻模上钻孔Ｏ１和Ｏ２时,孔边距的误差计算公式通常为ΔＫＢ＝δＬ１ｊ＋ｅ１２＋ｘ２２＋ｅ２２＋（２ｘ３）２孔Ｏ１与Ｏ２的孔间距误差计算公式为ΔＫｘ＝δＬ２ｊ２＋ｅ１２＋ｘ２２＋ｅ２２＋（２ｘ３）２＋ｅ３２＋ｘ５２＋ｅ４２＋（２ｘ６）２孔与工件底面垂直度误差计算公式（以孔Ｏ１为例）为ΔＫｃ１＝ｘ１ＢＨ各式中δＬ１ｊ———钻模板左底孔中心线与左侧定位面距离的尺寸公差　　ｅ１,ｅ２,ｅ３,ｅ４———…     

外排屑深孔钻削 DF系统的设计与研究

对外排屑深孔钻削DF系统的原理及装置进行了研究,对外排屑深孔钻削DF系统的参数选择及使用时注意事项进行系统地阐述。并设计制造出外排屑深孔钻削DF装置。经实验研究证明可有效的解决枪钻钻削过程中排屑等问题。     

孔加工振动切削的断屑机理

分析孔加工中常用的麻花钻、扩孔钻、深孔单刃钻等振动切削的断屑机理,得出各种钻头振动切削的最佳条件,包括振动发生器的最小振幅、振动频率和工件转速断屑的最佳比值及各种情况的断屑层图。     

Stress analysis of lead-free solders with under bump metallurgy in a wafer level chip scale package

The wafer level chip scale assembly (WLCSP) has increasingly become popular due to its compact, wafer scale assembly. In a WLCSP assembly, the under bump metallurgy (UBM) connecting the solder joints and the chip is crucial for the assembly reliability. This study focuses on a WLCSP with 96.5Sn3.5Ag/95.5Sn3.8Ag0.7Cu solder joints and Ti/Cu/Ni UBM on a 2–layer microvia build-up electric board. Furthermore, the Garofalo-Arrhenius creep model in finite element analysis ANSYS 6.0 is used for simulations on the WLCSP assembly under thermal cycling to investigate the deformations of the assembly with different thickness of nickel layer, the maximum equivalent strain and maximum equivalent stress of microvias/joints. Finally, the Coffin-Manson equation is applied to predict the fatigue lives of four combinations of solder joints with different eutectic alloy and thickness of nickel layer.     

斜孔钻模测量工艺孔的稳健位置

应用稳健设计原理,对斜孔钻模测量工艺孔的位置设计进行了分析,理论分析表明其位置尺寸对夹具精度和夹具设计的稳健性有重要影响,进而提出了确定工艺孔位置尺寸的具体方法。     

关节轴承油孔钻模设计

针对关节轴承在油沟上钻小孔加工困难的问题,设计了专用模具,提高了钻孔精度和生产效率.     

轴承钻油孔夹具结构改进

通过对轴承钻油孔夹具结构的改进,使钻油孔夹具内径与外径定位兼备,扩大使用范围,降低制造成本。经生产验证,经济、实用、便于管理。     

Influence of inclined holes in measurement of residual stress by the hole drilling method

The hole drilling method is widely used in measuring residual stress in surfaces. In this method, the inclination of holes is one of the sources of error. This paper presents a finite element analysis of the influence of inclined holes on the uniaxial residual stress field. The error in stress has been found to increase proportionally to the correct inclined angle of the hole. The correction equations by which one may easily obtain the residual stress, taking account of the inclined angle and direction, have been derived. The error of stress due to the inclined hole has been reduced to around 1% using the correction equations.     

Quantitative measurement of the hardness profile on carbo-nitriding steel by the hole drilling method

The thrust measured during a drilling test is related to the hardness of the material being tested. When the test is performed on a superficially heat-treated specimen, the results do not correspond exactly to the hardness profile obtained by the standard Vickers micro hardness technique.Because of the extreme hardness of the surface tested and the small diameter required to minimise material damage, a drill is more suitable than a milling cutter. The thrust measured during testing thus integrates heterogeneous resistance along the cutting edge of the drill. Consequently, correspondence between the hardness profile and the measured signal is shown to be non-linear. By discretising the thickness drilled, we have developed an algorithm which yields the hardness of each elemental thickness. Results for carbo-nitriding steel are very close to those obtained by the Vickers technique and the accuracy is also very similar for both methods.     

整体硬质合金枪钻在特深小孔钻削中的应用

本文分析了特深小孔及其钻削特点,对研制特深小孔钻床和钻头提出了一系列技术要求,并介绍了使用时的钻削参数,同时指出了钻削加工中应注意的几个技术问题。     

The upper bound of tool edge radius for nanoscale ductile mode cutting of silicon wafer

For ductile mode cutting of brittle materials, such as silicon wafers, the undeformed chip thickness has to be smaller than the tool edge radius. In practical application, for high production rate, the undeformed chip thickness is expected to be as large as possible. Therefore, the tool edge radius is expected to be as large as possible. In this study, the upper bound of the tool edge radius is investigated through cutting experiments.     

Optical emissions for monitoring of the percussion laser drilling process

In percussion laser drilling, a sufficiently powerful laser beam is used for the formation of a hole on the workpiece. In this study, the investigation of utilizing optical signals, acquired by means of photodiodes and emitted from the processing zone for real-time monitoring, is presented. The correlation between the sensor output and the geometry of the hole, determined by the depth and upper diameter, is investigated, and the results are presented. In general, the results indicate that there is a strong correlation between the optical signal output and the diameter of the hole.     

离子色谱法分析钻井液可行性研究

应用离子色谱法分析钻井液中阴阳离子的含量,关键在于钻井液的预处理。实验中,采用离心法去除钻井液中的固体颗粒,通过微孔虑膜过滤及活性炭吸附有机成分,可以有效地消除对测定的影响和对色谱柱的污染。实验结果表明,该方法具有良好的精度,其加标平均回收率为95%~105%,相对标准偏差优于4.0%。该方法用于实际样品分析,所得结果令人满意。     

Assessment of thermally deteriorated concrete by drilling resistance test and sound level

Concrete being the most versatile and widely used construction material finds application in varied range of structures. Many of these like chimneys, furnaces and reactors have to sustain high temperatures and perhaps all structures have to perform at elevated temperatures in the event of fire accidents. Concrete at elevated temperatures undergoes changes in its physical structure and chemical composition and loses its strength characteristics. Need for quick assessment of fire damaged concrete for strength characteristics, has motivated this work, which explores the potential of drilling resistance test on concrete as a Non Destructive Testing (NDT) tool. Drilling times, penetration depths and sound level measurement while drilling have been recorded and analysed to provide monograms that are handy as reckoners in failure forensics.     

钻曲轴斜油孔工装工艺参数的实用算法研究

总结了一套钻孔曲轴斜油孔工装工艺参数的实用计算公式，并举例说明。     

An experimental and computational method for investigation of residual stresses in two-layer construction members using hole drilling

A technical approach to the evaluation of residual stresses in bimetallic members of spatial constructions, for which stress jump at the interface of heterogeneous materials is peculiar, is presented. It is shown based on the test problem solution that, when up-to-date methods providing the possibility of obtaining significant volumes of experimental information are used to obtain the experimental data, the suggested approach makes it possible to obtain the results with the accuracy necessary for practical use.     

利用方形四探针技术测量硅基片薄膜电阻的研究

提出硅基片生长薄膜的薄膜电阻的测试方法,利用方形四探针技术实现对较小硅基片上生长钴的薄膜电阻的测量,完成不同生长厚度下三片薄膜硅片的薄膜电阻测试工作,得出测试结果较可靠、合理的结论,同时对提高测试实验精度的影响因素进行分析。