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1.
直纹面叶轮插铣加工关键技术   总被引:1,自引:0,他引:1  
为提高整体叶轮的粗加工效率,弥补目前商用计算机辅助制造软件在五坐标插铣加工能力方面的不足,研究了直纹面叶轮五坐标插铣加工的关键技术。根据直纹面叶片的偏移边界矢量,利用四元数插值方法计算插铣加工的刀轴矢量,提出并推导了五坐标插铣加工的行距和步距计算公式,保证了插铣加工的材料去除率和加工效率。依据上述算法自主开发了整体叶轮五坐标插铣加工专用计算机辅助制造软件,并对该软件生成的刀具轨迹进行了仿真和实际加工验证。结果证明,该方法在一定程度上提高了叶轮零件的粗加工效率。  相似文献   

2.
介绍了FLUENT软件的主要特点及其在叶轮机械领域的应用情况,并且以某轴流风机为例,用该软件进行数值模拟,分析其内部流场变化情况.通过这种模拟,能真实反映叶轮机械内部的复杂流动,为叶轮机械的设计和改进提供理论依据.  相似文献   

3.
叶轮零件结构复杂,其数控加工技术普遍存在编程复杂,困难且效率低下等问题.介绍使用典型的CAD/CAM软件UG7新增的叶轮加工模块,对深窄槽道、大扭角的滑轮发动机叶轮的五坐标加工程序刀路进行编制,大大提高了叶轮加工编程的速度和效率,为叶轮零件的编程加工提供了新思路和方法.  相似文献   

4.
根据叶轮加工专业软件中NC程序模块分类思路以及通用叶轮数控工艺的需求分析,提出了基于加工特征分类的整体叶轮五轴数控铣削程序模块划分方法.在对某型叶轮进行五轴加工工艺编排过程中对此方法进行了工程试用,最后通过VIRICUT加工仿真平台验证了叶轮工艺及特征分类方法的可行性和正确性.  相似文献   

5.
使用Visual Basic开发了轴流式叶轮机械试验演示与流场计算软件,该软件可对轴流式叶轮机械试验数据进行动态演示,并具有进行多级轴流压缩机S1流面流场计算、实时显示计算迭代过程及对计算结果进行图形后处理的功能.探讨了Visual Basic和Fortran混合语言编程技术.阐述了在Visual Basic中对图形处理软件Tecplot操控的具体实现方法.通过对一台小型轴流通风机的试验验证了该软件的实用性,具有较好的工程应用前景.  相似文献   

6.
对叶轮动模零件进行了工艺性分析,采用CAXA2011制造工程师软件完成叶轮动模零件的三维建模;用CAXA制造工程师软件的CAM功能模拟加工刀具轨迹和零件的加工过程,根据数控仿真加工结果编制叶轮动模的数控加工工序卡,用于指导现实加工.结果表明,叶轮动模的加工方法和铣削参数选用合理,对实际生产加工有一定的参考价值.  相似文献   

7.
董雷  王洁  陈田 《机械设计与制造》2021,366(8):225-228
根据三元叶轮焊接坡口大多采用手工修磨方法加工的现状和某企业对焊接坡口加工的图纸要求,首先将叶片中性面盖盘曲线拟合为NURBS曲线,并对其进行离散处理.再根据切削平面内圆柱铣刀与坡口的几何关系,开发出圆柱铣刀五轴侧铣加工三元叶轮焊接坡口的刀位算法.经仿真与试切加工,完全满足图纸要求.本算法不仅适用于两件焊式三元叶轮,同时适用于手把焊式二元叶轮和开槽焊式二元叶轮焊接坡口的五轴侧铣数控编程.实现了叶轮类零部件焊接坡口的数控加工,可有效的提高叶轮的加工精度和加工效率,提升焊接后叶轮的强度,并极大的减轻了操作工人的负担.  相似文献   

8.
不锈钢叶轮五轴联动数控加工中仿真技术应用研究   总被引:2,自引:0,他引:2  
分析了五轴联动数控中心加工不锈钢叶轮的技术难点,并运用仿真技术加以解决.提出了仿真方法和仿真流程,并基于VERICUT仿真平台,以某型号叶轮的加工过程为例,实际进行了仿真.仿真结果显示加工刀具、加工参数对叶轮质量有重要影响.分析了仿真出现的问题,通过改变刀具、优化加工方案,最终完成了加工.实践证明,仿真技术有利于提高不锈钢叶轮的加工成功率,改进加工质量.  相似文献   

9.
以离心式压缩机闭式叶轮为例,采用电解加工方法加工整体叶轮.介绍了电解加工闭式叶轮的思想,电解加工系统设计,阴极(刀具)的设计及制作方法.并结合实际加工工艺,对电解加工所造成的误差进行了说明,给电解加工在工业上的应用打下了更坚实的基础.  相似文献   

10.
精密小型叶轮由于加工精度要求高,叶片厚度薄且间距小,一直是叶轮加工的难点.以某小型叶轮为研究对象,用SmartCNC500精雕五轴联动加工中心、红外测头等设备进行加工实验,研究精密小型叶轮叶片加工的技术难点;并用JDSoft SurfMill软件辅助,进行刀具路径的编辑与仿真.通过加工实验,对比一般尺寸叶轮后,得出精密小型叶轮加工的切削参数、刀具路径的调整方法等.通过高端精密设备加工完成高精度的复杂零件,为行业提供了新思路新方案.  相似文献   

11.
An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...  相似文献   

12.
The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...  相似文献   

13.
黑棣  郑美茹 《机电工程》2016,(11):1315-1321
针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。  相似文献   

14.
针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。  相似文献   

15.
A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.  相似文献   

16.
The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.  相似文献   

17.
正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.  相似文献   

18.
针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。  相似文献   

19.
Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.  相似文献   

20.
Giannuzzi LA  Utlaut M 《Ultramicroscopy》2011,111(11):1564-1573
30 keV Ga+ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z2, and shows a non-monotonic relationship between contrast and Z2. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z2, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.  相似文献   

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