共查询到19条相似文献,搜索用时 140 毫秒
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机床的热态性能已成为影响高速机床工作性能的最重要的因素之一。主轴是机床的关键功能部件,其热态特性在很大程度上决定了机床的切削速度和加工精度,是影响机床精度提升的最重要因素。因此,在主轴的设计阶段减少机床热误差的影响,对于提高机床的热态特性十分重要。在过去的近一个世纪时间中,国内外众多学者针对主轴热设计方法开展了研究探索,基于热设计的过程可以分成三部分内容:热态特性分析方法,热设计与优化方法和热态特性试验方法。先通过主轴热态特性(如温度场分布、热变形、热平衡时间等)建模与分析获取必要的参数,然后以此为基础开展主轴结构设计优化、材料设计优化和冷却系统设计等热设计措施,获得较佳的主轴热态特性,最后通过热态特性试验来校验分析和设计优化的结果,整个过程循环直至达到满意结果为止。本文以此为脉络展开,分别探讨了三部分内容的国内外典型研究现状、主要研究内容和所存在的优缺点,并对未来的研究趋势进行了展望。 相似文献
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以普通车床、精密磨床、镗床的热变形试验为研究对象,把专家系统技术应用到机床热特性的研究,构造了机床热特性研究专家系统的结构。重点介绍了基于框架推理和规则推理相结合的热变形试验方案决策专家系统。 相似文献
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<正> 一、引言机床热态特性是表征机床性能的一个重要方面。Birmingham 大学教授 J.Peklenik的研究分析表明,在精密加工机床中因热变形影响而造成的工作精度误差占总误差的40%~70%。对机床进行热变形成试验正越来越得到人们的重视。机床热稳定后的最高温度与温升已成为控制机床质量的通用技术条件,机床热平衡时间作为描述机床热态特性的指标之一。机床热变形试验中,机床真 相似文献
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本文引入机床柔性体动态响应特性及相对振动影响比值的概念,说明振动对加工精度的影响,重点介绍了根据柔性体动态响应特性及实验统计结果的分析,设计机床隔振基础的方法。并有针对性地列举了典型的隔振,减振基础结构。可供机床基础设计人员参考。 相似文献
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数控机床热敏感点识别研究 总被引:4,自引:0,他引:4
运用模式识别中的逐步回归法辨识反映机床热态特性的热敏感点,并利用多元回归建立了机床热敏感点处的温升与主轴Y向热位移关系的数学模型。应用表明这是一种在机床温度测量,热误差建模及补偿中选择最佳测温点的有效方法。 相似文献
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一、引言机床热态特性是表征机床性能的一个重要方面。Birmingham大学教授J.Peklenik的研究分析表明,在精密加工机床中因热变形影响而造成的工作精度误差占总误差的40%~70%。对机床进行热变形成试验正越来越得到人们的重视。机床热稳定后的最高 相似文献
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机床热变形试验是研究机床热特性的一个重要方法,我们应用微型计算机(如APPLE-II)并配备数据采集装置,可以实现试验数据的自动采集、记录及试验结果的自动分析计算,并打印输出试验结果报告。极大地提高了试验效率和精度,缩短了试验周期。本软件系统的功能如图1所示,主要由 相似文献
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机床液压平衡系统的分析 总被引:1,自引:0,他引:1
陆慧琴 《精密制造与自动化》2001,(1):15-17
文章分析了传统机床液压平衡回路,介绍了现代机床液压平衡回路及元件,分析其特性,并给出液压平衡装置的设计计算方法。 相似文献
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在役机床再制造具有典型的个性化特征。在分析在役机床再制造个性化需求的基础上,提出了在役机床个性化再设计的概念,并分析了多重个性化内涵;从机床产品生命周期、机床整机及零部件性能演化与损伤等理论基础,运行状态数据采集与监测、数据存储与处理、状态诊断与决策分析、个性化再设计支持工具等支撑技术以及个性化匹配、可再制造性评价、质量提升再设计、智能化提升再设计、绿色化提升再设计等关键技术三个方面构建了基于监测诊断的在役机床个性化再设计技术体系;最后,结合某在役重型卧式车床再设计过程进行了案例分析。 相似文献
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Dong-Hoon Kim Jun-Yeob Song Jong-Hyun Lee Suk-Keun Cha 《Journal of Mechanical Science and Technology》2009,23(10):2807-2813
In the near future, the foreseen improvement in machine tools will be in the form of a knowledge evolution-based intelligent
device. The goal of this study is to develop intelligent machine tools having knowledge-evolution capability in Machine to
Machine (M2M) wired and wireless environment. The knowledge evolution-based intelligent machine tools are expected to be capable
of gathering knowledge autonomously, producing knowledge, understanding knowledge, applying reasoning to knowledge, making
new decisions, dialoguing with other machines, etc. The concept of the knowledge-evolution intelligent machine originated
from the process of machine control operation by the sense, dialogue and decision of a human expert. The structure of knowledge
evolution in M2M and the scheme for a dialogue agent among agent-based modules such as a sensory agent, a dialogue agent and
an expert system (decision support agent) are presented in this paper, and work-offset compensation from thermal change and
recommendation of cutting condition are performed on-line for knowledge-evolution verification. 相似文献
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Thermal error monitoring technology is the key technological support to solve the thermal error problem of heavy-duty CNC(computer numerical control) machine tools. Currently, there are many review literatures introducing the thermal error research of CNC machine tools,but those mainly focus on the thermal issues in small and medium-sized CNC machine tools and seldom introduce thermal error monitoring technologies. This paper gives an overview of the research on the thermal error of CNC machine tools and emphasizes the study of thermal error of the heavy-duty CNC machine tool in three areas. These areas are the causes of thermal error of heavy-duty CNC machine tool and the issues with the temperature monitoring technology and thermal deformation monitoring technology. A new optical measurement technology called the ‘‘fiber Bragg grating(FBG) distributed sensing technology' for heavy-duty CNC machine tools is introduced in detail. This technology forms an intelligent sensing and monitoring system for heavy-duty CNC machine tools.This paper fills in the blank of this kind of review articlesto guide the development of this industry field and opens up new areas of research on the heavy-duty CNC machine tool thermal error. 相似文献
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一种新的数控机床热误差实时补偿方法 总被引:2,自引:0,他引:2
根据数控机床加工热误差,首先,利用粗集理论方法,分析各变量与热误差之间的相关性,选择出机床热误差补偿的重要特征参数。然后提出一种动态反馈网络建立数控机床加工热误差补偿模型,新的数控机床热误差实时补偿方法具有补偿误差精度高,网络学习收敛速度快,误差补偿实时性好等特点。仿真实验结果证明了该方法的可行性和有效性。 相似文献
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The accuracy of machine tools is affected by both internal heat sources and time-varying environmental temperature. Therefore, the thermal deformation caused by environmental temperature variation is an important factor, which requires attention during thermal error modeling. In order to analyze the influence of time-varying environmental temperature on the thermal error of the machine tool, this paper proposed a thermal error modeling approach by using the thermal error transfer function of the machine tool. The approach was implemented in the following three steps. First, the thermal time constant of major components was calculated, according to structural parameters. Then, the thermal error transfer function of the components was derived. Finally, the thermal error transfer function of the whole machine was built based on the construction relationship. The analytical approaches of time domain and frequency domain were applied to obtain the thermal characteristics of machine tools based on the thermal error transfer function. Numerical simulations and the Z-axis operating experiment of three-axis milling machine were performed to verify the accuracy and effectiveness of the thermal error predicted model. The result shows that the proposed model is versatile and general with a clear modeling mechanism, which would provide a useful tool for the analysis and optimization design of machine tools with good thermal robustness. 相似文献