共查询到20条相似文献,搜索用时 109 毫秒
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《机械工程与自动化》2017,(6)
通过对空间啮合理论及成形刀具廓形设计的研究,推导出螺杆螺旋面与成形铣刀的接触线方程,利用成形铣削原理和坐标变换原理,将接触线方程转化到刀具坐标系中,建立了基本的铣刀刀刃廓形方程,由此设计螺杆成形铣刀廓形。 相似文献
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研究了加工特种回转面刀具的精确理论;导出了工艺系统运动函数非线性方程组,采用这种方法,一条刀刃是用成形法加工,另一条刀刃是按接触条件得到,概念简单,计算方便。 相似文献
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以YT5类硬质合金刀具切削45号钢为研究对象,利用ANSYS软件,建立了金属二维正交切削过程的有限元模型。讨论了金属切削过程仿真所涉及到的分离标准、节点耦合、接触等问题;对剪切角进行了有限元计算,并和李和谢夫理论、麦钱特理论进行了比较,发现ANSYS计算的剪切角与李和谢夫理论更为接近。随着切削速度的提高,刀具最大等效应力值呈下降变化。研究结果表明,刀具承受的应力值与前角和后角成非线性的比例关系,当前角γ=3o、后角α=5o时刀具应力最小,对认识刀具的切削有一定的作用。 相似文献
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金属塑性成形中裂纹萌生的预测 总被引:6,自引:0,他引:6
本文讨论应用有限元法预测塑性成形中裂纹的产生。首先简述金属非线性变形理论,其次介绍有限元方程和算法、应变硬化法则及弹塑性模型,最后应用弹塑性有限元相关的断裂准则来预测塑性成形中裂纹的产生。 相似文献
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分离涡流场数值仿真的参数影响研究 总被引:1,自引:0,他引:1
分离涡流场普遍存在于工业现场,数值仿真和试验研究在分离涡研究中相辅相成。数值仿真控制方程存在多个参数,某些参数变化对仿真结果有很大影响。以二维后向台阶流场、圆管后向台阶流场和圆管楔形流场为例,借助粒子图像测速技术和数值仿真方法,对参数变化影响进行研究。使用切应力运输(Shear stress transport,SST)k-ω湍流模型对分离涡流场进行数值仿真,理论推导得到SST k-ω湍流模型参数a_1变化对三种具有分离涡的流场数值仿真结果的影响。研究结果认为参数a_1越大,回流区长度越小。通过数值仿真验证理论推导结论。并通过比较模型参数变化对数值仿真结果的影响,认为圆管楔形流场与二维后向台阶流场、圆管后向台阶流场具有相似流场特性。根据粒子图像测速技术观测结果,优化模型参数a_1的设置。 相似文献
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根据数控车削的原理和现有仿真软件的特点,对仿真系统做了需求分析,设计了仿真系统的总体方案.基于对NC代码的特点,在Visual C++6.0中定义了目标代码数据结构,实现了NC代码解释算法.基于自下向上,利用基本几何元素的布尔运算,简化了车削仿真环境的建模.利用OpenGL的双缓存技术,采用不断更新显示毛坯和零件的相关... 相似文献
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简要介绍了车辆路径问题及仿真的知识,针对实际问题,利用Witness仿真软件,建立车辆路径问题的仿真模型,然后运行仿真模型,得到仿真输出结果,通过对模型结果的输出分析,寻找车辆路径问题的瓶颈因素,通过对瓶颈因素的解决,进行问题的优化,最后得到更优的可行解。 相似文献
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仿真网格资源共享池关键技术研究 总被引:4,自引:0,他引:4
仿真网格资源共享池是基于网格仿真动态调用仿真资源完成仿真任务的基础。为了建立标准的资源池,介绍了基于网格服务的网格化仿真资源的关键技术。在概念上采用与平台无关的模型描述资源,以确保其可装配性和交互性;在网格服务中加入仿真功能,使其成为同时符合高层体系结构和网格标准的仿真服务。提出了仿真服务规范,包括服务的构成、接口、服务对象模型及管理机制等;实现用解析平台无关的模型自动生成仿真服务。介绍了基于模板的服务自动生成工具的设计,并在上述规范和技术的基础上建立了仿真网格资源共享池,介绍了两个使用仿真资源装配成的仿真应用实例。 相似文献
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This study constructs a contact-mode atomic force microscopy (AFM) simulation measurement model with constant force mode to simulate and analyze the outline scanning measurement by AFM. The simulation method is that when the probe passes the surface of sample, the action force of the atom of sample received by the atom of the probe can be calculated by using Morse potential. Through calculation, the equivalent force on the cantilever of probe can be acquired. By using the deflection angle equation for the cantilever of probe developed and inferred by this study, the deflection angle of receiving action force can be calculated. On the measurement point, as the deflection angle reaches a fixed deflection angle, the scan height of this simulation model can be acquired. By scanning in the right order, the scan curve of the simulation model can be obtained. By using this simulation measurement model, this study simulates and analyzes the scanning of atomic-scale surface outline. Meanwhile, focusing on the tip radii of different probes, the concept of sensitivity analysis is employed to investigate the effects of the tip radius of probe on the atomic-scale surface outline. As a result, it is found from the simulation on the atomic-scale surface that within the simulation scope of this study, when the tip radius of probe is greater than 12 nm, the effects of single atom on the scan curve of AFM can be better decreased or eliminated. 相似文献
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Contact force studies of a burnishing slider 总被引:1,自引:0,他引:1
In order to design the flying height of a burnishing slider accurately, the contact force between the burnishing slider and the disk needs to be well evaluated. This paper studies the contact force of a burnishing slider by both experiment and simulation. The experiment is conducted by measuring the acoustic emission signals of the contact force avalanche, and the simulation is based on the self-developed air bearing surface simulation code applying the probability model for the contact force calculation. The influence of contact force on the burnishing effect is discussed. It is observed that the simulation results are well correlated with the experimental measurements. It is believed that the simulation code is capable to design burnishing sliders with reasonable accuracy. 相似文献
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Investigations on model-based simulation of tool wear with carbide tools in milling operation 总被引:1,自引:1,他引:0
Chen Zhang Laishui Zhou Xihui Liu 《The International Journal of Advanced Manufacturing Technology》2013,64(9-12):1373-1385
This paper deals with tool wear in milling operation using carbide tools. The main purpose of this work is to define a model-based procedure for forecasting tool-wear progression during cutting operation by using machining simulation. Firstly, a multi-axis machining simulation algorithm is proposed based on DEXEL model and local area update method. NC milling machining process simulation software NCToolWearSim is realized by using Visual C++ and OpenGL. The developed process simulation software is used to simulate the cutting process. Secondly, tool-wear simulation algorithm in the machining process is presented with tool-wear model and machining simulation algorithm and is implemented into the machining simulation software NCToolWearSim in order to evaluate the tool wear and to update the tool geometry. The tool-wear value is estimated according to the established tool-wear model from experienced tool-wear data. Thus, tool-wear progression can be visualized in milling operation by using NCToolWearSim. Finally, experimental tests, performed milling integral wheel with carbide tools, were used to calibrate and validate the correctness of tool-wear simulation process based on the tool-wear model. 相似文献