防松螺旋副动态对孔插销方法的研究

文章基于现场调研的基础上，对目前我国现有汽车部件装配中使用拧紧机拧紧的螺旋副联接的对孔插销问题作了仔细研究．对其结构状态、工作原理、装配工艺、装配设备、装配过程进行了现场观察与分析．通过分析螺旋副对孔插销的动态全过程，了解了对孔过程的角度变化结果及其规律；同时论文还进一步在理论上解释了实际装配中达到合格扭矩但却无法对孔而不得不更换螺帽这种情况的原因；在此基础上提出了一种新的对孔方法一编码器对孔法来解决问题。最后该文以结论的方式提出了螺旋副对孔插销结构的建议，改进工艺，在扭矩要求较严的场合尽量不用插销法。     

多齿差摆线齿轮泵基本参数的优化设计

多齿差摆线齿轮泵基本参数的选择要满足各种限制条件。本文以单位体积排量最大作为目标函数，以啮合角、重合度及齿廓不产生重迭干涉等为约束条件，建立了多齿差摆线齿轮泵的优化设计数学模型，并对两种常用齿数组的多齿差摆线齿轮泵基本参数进行了优化设计。所得结果可以和不同的齿数与中心距进行组合应用，得到不同流量的产品系列。。     

表面处理对亲水铝箔持续亲水性的影响

通过测定水洗200h后,水滴在亲水铝箔表面接触角的方法来确定脱脂和铬化对亲水铝箔持续亲水性的影响。发现只要清洗彻底,则持续亲水性与脱脂剂的种类无关。铬化对持续亲水性的影响很大,用磷酸铬酸盐法处理的铝箔,其持续亲水性比用铬酸盐法处理的要好。用磷酸铬酸盐法于30℃,将铝箔处理3min,最后涂布亲水涂层得到的亲水铝箔,其持续亲水性最佳,水冲200h后,接触角为9～11°。     

大变形零件温挤压凹模型孔设计技巧

对大变形程度、圆坯正挤压出两种变截面挤压方式进行了工艺和质量对比，在凹模型孔形式上采用了双锥角模口导流方式，第一次提出了在挤压初始阶段，利用双锥角形成大的材料初始流速和流动惯性来克服流动前期变形抗力峰值以达到模口材料周边匀速流动目的的理论。     

对称复合板冷轧过程的上限分析

采用Hill提出的速度场 ,计算了对称复合板冷轧变形过程的能量消耗 ,在此基础上对软复层对称复合板在不同参数组合下冷轧时所需的最小摩擦、最大允许的加工率、以及复合板与轧辊间的摩擦状态进行了计算和分析 ,给出了相关计算曲线。计算结果表明 ,当基体材料的相对强度和相对厚度较小时 ,复合板冷轧时的变形行为与单金属冷轧时类似 ,但当基体材料的相对强度和相对厚度较大时 ,接触表面容易产生粘着现象。     

Effects of laser beam energy and incident angle on the pulse laser welding of stainless steel thin sheet

This paper reports an experimental study of laser spot welding on stainless steel sheets. A pulsed Nd:YAG laser was used to weld the stainless steel specimen in the range of laser energy 0.6–1.2 J and incident angle 30–75° (the angle of the laser beam incident direction to the sheet surface). Metallography was applied to measure the cross-sectional size and shape of the welded spot. From the experimental results, it is found that as the laser energy increases, the penetration depth, bead length, and bead width of the welded spot increase. As the laser incident angle increases, the penetration depth and the bead width increase while the bead length decreases. The results illustrate that the shape and size of the welded spot depend not only on the laser energy, but also on the incident angle of laser beam.     

A model for cutting forces generated during machining with self-propelled rotary tools

In this paper, a force model for self-propelled rotary tool is presented. Conventional oblique cutting force predictions were reviewed and extended to predict the cutting forces generated during machining with the self-propelled rotary tools. The model presented is based on Oxley's analysis and was verified by cutting tests using a typical self-propelled tool. Good agreement was obtained between the predicted and the experimentally measured forces under a wide range of cutting conditions. The effect of different cutting conditions on the friction coefficient along the chip/tool interface and tool rake face normal force were also presented and discussed.     

CRYSTALLOGRAPHIC ANALYSIS OF THE LATH MARTENSITE TRANSFORMATION IN Fe-Ni-Mn ALLOY

1.IntroductionBased on the concept of an invariant plane strain (IPS), phenomenological theory of martensite transformation (PTMT) is established[1-3]. In this case, an invariant plane is obtained by self-accommoda-tion effect between different martensitic variants, and the formula which reveals this self-accommoda-tion effect can be written as …     

钛合金等温锻造进展

等温锻造是一种先进的加工工艺。本文从钛合金高温变形特性、等温锻造参数选择、模具设计、润滑剂摩擦特性等诸方面全面地介绍了这种先进的锻造工艺，它的应用前景及发展方向。     

New method for determination of the pose of the grinding wheel for thinning drill points

Traditionally, twist drills are reconditioned by thinning the web so the correct chisel edge length is restored. Recently, thinning has been included in the original design of drills so as to reduce torque and tool force. Because the International Standards Organization (ISO) has a system which can comprehensively model conventional twist drills but cannot model thinning specifications, this paper presents a system for precise mathematical modeling and CNC control of a 6-axis grinding workstation for drill thinning. The presented method determines the position and orientation of the grinding wheel based on the evaluated rake and clearance angles of ISO standards for 2-flute twist drills. The mathematical model and background are discussed. For verification and demonstration, two experimental drills are produced to the identical ISO standard except that one is thinned. The modeling herein is of value to industry and research if incorporated into computer software for drill design and manufacture. It is suitable for linear notch-type cutting with controlled variable rake angle along the secondary cutting edge for purposes of thinning, notching, dubbing and advanced drill research.