麻花钻内锥面刃磨法

阐述了麻花钻内锥面刃磨法的原理及参数的确定方法，揭示了内锥面刃磨中存在“翘尾”现象的原因并提出了相应的解决措施。     

外锥面砂轮实现内锥面刃磨钻头的方法

提出了利用外锥面砂轮实现内锥面刃磨钻头的方法，设计了实现该方法的连杆齿轮组合机构。克服了用成型砂轮实现麻花钻的内锥面刃磨时，小直径尺寸的麻花钻无法磨削的缺点，同时又能提高麻花钻的刃磨效率和刃磨质量。     

麻花钻的数学建模与后角的测量

提出了标准麻花钻内锥面刃磨法的建模方法,在分析麻花钻几何结构的基础上,确定了麻花钻后刀面和钻尖后角的计算公式,并利用MATLAB软件分析了其变化规律以及各刃磨参数对麻花钻后角的影响。     

麻花钻内锥成刃磨法

阐述了麻花钻内锥面刃磨法的原理及参数的确定方法，揭示了内锥面刃磨中存在的“翘层”现象的原因并提出了相应的解决措施。     

麻花钻的数学建模与后角的测量

提出了标准麻花钻内锥面刃磨法的建模方法,在分析麻花钻几何结构的基础上确定了麻花钻后刀面和钻尖后角的计算公式,并利用Matlab软件分析了其变化规律以及各刃磨参数对麻花钻后角的影响。     

基于UG的标准麻花钻三维实体建模

建立麻花钻的三维实体模型是对麻花钻进行几何设计、制造、切削性能分析和对钻削过程进行仿真研究的基础。基于麻花钻的制造过程,介绍了在三维软件UG环境下,根据标准麻花钻的相关参数进行三维实体建模的方法,采用椭圆弧代替螺旋槽截形生成前刀面,分析了后刀面锥面刃磨法,在此基础上采用改进的新型锥面刃磨法建立后刀面模型,完成麻花钻实体模型。     

麻花钻锥面后刀面线切割成形加工装置的设计

针对麻花钻锥面后刀面刃磨装置的复杂性及现有砂轮刃磨存在的问题,基于麻花钻后刀面刃磨理论的研究成果,提出了一种新的麻花钻锥面后刀面刃磨方法——数控电火花线切割刃磨(成形)方法,即用线切割成形代替砂轮刃磨。研究了麻花钻锥面后刀面线切割的成形原理,建立了麻花钻线切割成形方法的数学模型;确定了成形装置的运动方案,设计了装置的二维、三维模型图,最终设计了成形加工装置的数字样机模型,并进行了运动仿真分析,确定了运动方案的可行性;进行了模拟线切割试验,分析了电参数对成形过程的影响,选择了合适的电参数。该装置不仅可以实现后刀面刃磨,而且装置结构简单,易于操作,克服砂轮刃磨易烧伤等缺陷,对超硬材料麻花钻锥面后刀面刃磨加工具有重要的研究意义。     

麻花钻后刀面螺旋锥面刃磨法的研究

在分析和研究锥面刃磨法和变导程螺旋面刃磨法的基础上,提出了麻花钻后刀面螺旋锥面刃磨法并构建了相关的数学模型。采用螺旋锥面刃磨法不仅能得到麻花钻直线主刀刃和更理想的后角值分布,而且解决了采用变导程螺旋面刃磨法钻芯强度较弱以及采用锥面刃磨法存在的后刀面"翘尾"现象。     

麻花钻锥面刃磨参数电子封闭图的研究

基于锥面刃磨法的工作原理,设计了麻花钻内锥面刃磨的虚拟样机,并基于LabVIEW开发环境,编制了锥顶距A和偏距e的封闭图,当设定钻头公称直径、半锥角等参数后,即可获得后角和横刃斜角临界值范围内的4、e值及其对应的后角、横刃斜角值,此封闭图适合于内、外锥面刃磨法参数的选取,为高质量后刀面刃磨参数的确定提供了一种简捷高效的方法.     

基于MATLAB的麻花钻锥面刃磨参数的优化

针对麻花钻锥面刃磨的翘尾现象,建立数学模型,经分析提出了利用MATLAB优化工具合理选择刃磨参数的方法。试验证明该方法有效可行。     

某型号飞机起落架支柱减振筒内壁腐蚀原因分析

飞机起落架减振支柱在飞机起落和滑跑时,吸收撞击能量,对飞机安全起降的意义重大.减振筒是减振支柱中的重要部件,本文从工艺流程、理化分析、外场使用和腐蚀机理分析等方面,对减振支柱减振筒内壁的腐蚀原因及危害进行了综合分析,并提出了相应措施.     

Natural frequencies of vibration of a class of solids composed of layers of isotropic materials

In a recent paper, the Ritz method with simple algebraic polynomials as trial functions was used to obtain an eigenvalue equation for the free vibration of a class of homogeneous solids with cavities. The method presented is here extended to the study of a class of non-homogeneous solids, in which each solid is composed of a number of isotropic layers with different material properties. The Cartesian coordinate system is used to describe the geometry of the solid which is modelled by means of a segment bounded by the yz, zx and xy orthogonal coordinate planes and by two curved surfaces which are defined by fairly general polynomial expressions in the coordinates x, y and z. The surface representing the interface between two material layers in the solid is also described by a polynomial expression in the coordinates x, y and z. In order to demonstrate the accuracy of the approach, natural frequencies are given for both a two- and three-layered spherical shell and for a homogeneous hollow cylinder, as computed using the present approach, and are compared with those obtained using an exact solution. Results are then given for a number of two- and three-layered cylinders and, to demonstrate the versatility of the approach, natural frequencies are given for a five-layered cantilevered beam with a central circular hole as well as for a number of composite solids of more general shape.     

叶切面最大厚度数值计算与应用

以叶切面最大厚度的数值计算方法为基础,探讨叶切面最大厚度计算的计算机实现,介绍叶切面厚度数值计算法的应用实例.     

膨胀套导向机构的设计

通过分析膨胀套在实际使用产生滑移受阻现象、卡死现象原因的实质,并在分析产生问题原因的基础上提出了改进措施即：增加导向机构。     

Effect of Impregnation of Iodine Complex on Friction of Anodic Oxide of Aluminum

Polyvinyl pyrrolidone-Iodine complex (PVP-I) molecules were impregnated into the anodic oxide of an aluminum disk specimen. It was rubbed against a silicon nitride ball specimen using a ball-on-disk type friction test rig. Over the limited range of parameters studied (load: 0.2-1.0 N, sliding velocity: 0.6 mm/s, and sliding distance: 1-7 m), the coefficient of friction decreased to a value as low as 0.01 from values of 0.3 to 0.7 for the anodic oxide surface. Single-crystal iodine rubbed against silicon nitride showed a coefficient of friction of 0.1. The low coefficient of friction is attributed to the thin PVP-I film on the relatively hard anodic oxide. The mechanism of coefficient of friction reduction is the same as that of a thin soft film on a hard substrate.     

双丝杠驱动机构同步分析

介绍了双丝杠驱动机构工作原理,论述了双丝杠运动产生不同步的原因以及如何判定与解决同步问题。     

磨粉机快辊轴承座加工工艺设计

设计了磨粉机快辊轴承座的加工工艺和具体的工装夹具.利用卧式加工中心加工磨粉机快辊轴承座,辅以能够高效快速夹紧的夹具,既可以保证加工精度,又能够提高加工效率.     

我校工业设计教育改革初探

针对目前市场对工业设计人才的需求,本文论述了我校在工业设计教育方面的改革措施,着重介绍了我校工业设计教育在软件和硬件方面所进行的一系列的改革。     

两种仪表功能合理性评述

本文以某些积算和双笔记录仪产品为例说明由于仪表功能设计的不合理或选型不当，影响了仪表的正常使用，制造厂和用户应关注这类问题。     

Modeling of coefficient of contraction of differential pressure flowmeters

The article provides a solution to the problem of contraction process modeling when measuring the flow of fluids and gases using differential pressure flowmeters. The article shows the feasibility of obtaining the coefficient of contraction from the mathematical model of the reduced/contracted flow of fluids or gases. An analytical expression is obtained for the coefficient of contraction, which agrees well with the results of the experiment. Analysis of this expression is performed and dependencies on the geometrical parameters of the pipeline and orifice plate are obtained.