共查询到20条相似文献,搜索用时 15 毫秒
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LI Cheng ren 《国际设备工程与管理》1999,(Z1)
FOrwardComputernumericalcontrolisamorematurefieldintheareaofreal-timeconealofthecomputer.FromthestandPOintofsoftware,itisamonOProgramndngbatchProcessingreal-timeoperatingsystem.User'spartPro~(specifichigh-levellanguage)isprognrIUnedintheformofblock.O... 相似文献
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为了实现纤维丝束的自动铺放,研制了七自由度四丝束铺放样机。该设备采用卧式总体布局,铺放头包括丝束夹紧、重送、切断、施压、加热、导向等模块。铺放设备的结构形式为七自由度冗余机构,采用位姿分离法,将机构的七个自由度化简为6+1的非冗余机构的形式,利用简化的运动学逆解方法解决了其运动学逆解问题。数控系统采用当前主流的IPC+运动控制卡的开放式结构形式,运动代码采用标准的G代码形式,并利用运动控制卡的PLC功能,以M代码的形式实现了铺放头的丝束控制动作,实现了铺放机控制代码的标准化。最后通过机床的铺放运动试验,证明了文中阐述方法的正确性和可行性。 相似文献
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This paper studies some key technologies of CNC system for cam grinding. Themathematical motion model for cam grinding is established according to the harmony of re-ciprocating motion of the grinding wheel and the rotating motion of the woorkpiece. Themethod of using the linear servomotor to accomplish the grinding wheel tracking is devel-oped and the dynamic model of the system is analyzed. Then the cross-coupled biaxial errorcompensation model is proposed. Finally,the hardware and software of the control systemare designed based on open architecture. Some algorithms, such as spline fitting and inter-polation for cam contour, velocity control and feed control, are presented to improvegrinding precision. 相似文献
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GONG Shi-hua DUAN Zheng-cheng ZHU Guo-liCollege of Mechanical Science Engineering HuazhongUniversity of Science Technology Wuhan P.R.China 《国际设备工程与管理》2002,(2)
This paper studies some key technologies of CNC system for cam grinding. The mathematical motion model for cam grinding is established according to the harmony of re-ciprocating motion of the grinding wheel and the rotating motion of the workpiece. The method of using the linear servomotor to accomplish the grinding wheel tracking is devel-oped and the dynamic model of the system is analyzed. Then the cross-coupled biaxial error compensation model is proposed. Finally,the hardware and software of the control system are designed based on open architecture. Some algorithms, such as spline fitting and inter-polation for cam contour, velocity control and feed control,are presented to improve grinding precision. 相似文献
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目前,国内尚无针对CNC数控机床在线测量系统的相关的标准和校准规范。为统一技术要求,本文研究了CNC数控机床在线测量系统的工况条件及其计量特性参数,提出了有别传统三坐标测量机校准方法的校准方案,研制了符合基于公差带位置判别废品原理的标准器组,以在线测量系统的测工件的方式,反向校准CNC在线测量系统的尺寸精度,解决其量值溯源问题。 相似文献
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目前CNC机床在线测量系统的校准方法在国内有用激光干涉仪、标准量块等一些用于企业的针对性方法,缺少适用于计量校准机构的校准方法,本文根据该系统的工作原理,对CNC机床在线测量系统的校准方法进行研究,提出几项计量特性参数,并结合实际情况设计了校准方案,研制了校准用计量标准器,分析了数据的处理方法.经研究表明,本文的校准方... 相似文献
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自由曲面的CNC直接插补加工技术 总被引:5,自引:0,他引:5
在CNC系统上直接根据曲面几何定义与加工工艺参数对多轴贡面加工的连续运动轨迹进行实时插补控制,在CNC上直接在APT高级语言编程,极大地科化了零件程序,并可在线修改与补偿机床运动结构、刀具形状尺寸及加工作量等工艺参数,使曲在线曲面精加工经济而高效。在单CPU硬件环境下实现了从一般二次曲线到复杂的参数组合曲面,从两轴加工到复杂的五轴联动功能,可采用多种加工刀具与加工方式,可实时检测与处理刀具干涉,并 相似文献
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WANG Runxiao ZHOU Hui QIN Xiansheng JIAN Chongjun Northwestern Polytechnical University Xi''''an P. R. China 《国际设备工程与管理》2000,(4)
1IntroductionAtpresent,manyscholarshavedonetheirresearchesontheCNCfaultdiagnosisbyusingexpertsystemES)homeandabroad.,butevenifinsomehighlysuccessfulESusage,therestillexistaseriesofproblemssuchas"bottle-neck",combinationexplosion,andsoon.TheseproblemsarecausedbytraditionalESitself,soonlybyimprovingtheinnermechanismoftheESandenhancingitsfunctioncanwesolvetheproblems.BasedontheresearchesofthetraitsofCNCfaultdiagnosisandthedisadvantagesoftheCNCfaultdiagnosisES,thepaperputsforwardtheideaand… 相似文献
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CNC并行多任务调度算法及其实现 总被引:3,自引:0,他引:3
在分析CNC系统多任务特点的基础上,介绍了CNC系统的多任务分类方法,并提出了基于通用32位操作系统,运行于保护模式下的多任务调度方法。 相似文献
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数控加工中心的位置误差补偿模型 总被引:8,自引:1,他引:8
本文以三轴数控加工中心为例,利用齐次矩阵建立了完备的数控加工中心的位置误差补偿模型,利用本文方法可以对三轴以上的多轴数控加工中心的位置误差进行建模,本文的建模方法和结论可以应用到三坐标测量机、工业机器人的位置误差模型的建立和位置误差补偿中去,以便在不增加制造成本的情况下,提高加工精度或测量精度,实现“不使用精密设备的精密加工”。 相似文献
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张宇 《中国材料科技与设备》2013,(1):18-19
数控刀具是数控加工技术中的重要基础装备之一,在保证制造技术的有效实施方面有着十分重要的作用。本文主要介绍数控机床刀具的分类、数控刀具材料的现状和发展趋势。 相似文献
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Reliability Analysis of the CNC System Based on Field Failure Data in Operating Environments 下载免费PDF全文
Reliability is a measure of how well a product will perform under a certain set of conditions for a specified amount of time especially in the field environments. In this paper, a reliability study of a computer numerical control (CNC) system is described. For this analysis, field failure data from a shop manufacturing factory collected over the course of a year on approximately 20 CNC machine tools during their operating period were analyzed. Based on the field failure data, the two‐parameter exponential distribution was found to be applicable to describe the time between failures of the CNC system from among many distributions including Weibull, gamma, two‐parameter exponential, normal, and logistic using the chi‐squared test. In this paper, we discuss the reliability estimation of the CNC system based on the collected field failure data from a manufacturing factory using the maximum likelihood estimate (MLE) and uniform minimum variance estimate (UMVUE) methods. We also discuss the confidence intervals of the mean residual lifetime and reliability function. The result shows that the UMVUE method can provide much better and more accurate results in estimating the reliability of the CNC system than the MLE. This finding, on the one hand, seems to be obvious because the UMVUE is not only an unbiased estimator but also sufficient statistic with the smallest variance; on the other hand, it is not straightforward to obtain the UMVUE of any complex function, which is the reliability function in this case. This is a very important finding and is very encouraging because it indicates that the reliability analysis of the CNC system based on the UMVUE can be more than compensated by the ability of the complexity of parameter estimation method to better evaluate and predict the reliability of the CNC system. Hence, we believe that it is worth the effort to derive those parameter functions using UMVUE method. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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Sinan Gurel 《国际生产研究杂志》2013,51(24):6797-6821
In this study we attempt to deal with process planning, scheduling and preventive maintenance (PM) decisions, simultaneously. The objective is to minimize the total completion time of a set of jobs on a CNC machine. During the process planning, we decide on the processing times of the jobs which are controllable (i.e. they can be easily changed) on CNC machines. Using shorter processing times (higher production rates) would result in greater deterioration of the machine, and we would need to plan more frequent PM visits to the machine, during which it would not be available. Therefore, the selected processing times determine not only the completion times but also the PM visit times. We first provide optimality properties for the joint problem. We propose a new heuristic search algorithm to determine simultaneously the processing times of the jobs, their sequence and the PM schedule. 相似文献
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The research and practice of CIMS and FMS has brought about a great development to ad-vanced manufacturing systems for decades.The experience of failure and success during the process of development is a revelation and reference for the design of a fault diangosis system.This paper focuses on its function of directing to the design of a fault diagnosis system in terms of the flexibility of the sys-tem,the humans importance in the system,and the design of a distributed system.In view of the tend-ency of CIMS and FMS, the article also states the principle that the new fault diagnosis system should be improved by enhancing hardware in software,remote Internet service,and sustainable development. 相似文献
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This study investigated the optimization of a CNC turning process for SKD11 (JIS). The design of experiments (DOE) method with an orthogonal array was applied. Nine experimental runs were performed based on the orthogonal array. The surface properties of roughness average and roughness maximum and the roundness were studied; the analysis of variance (ANOVA) was adapted to investigate which parameters had the most influence on the CNC turning process for SKD11 (JIS). Also, models for predictions of the roughness average, roughness maximum, and roundness had been developed in terms of cutting speed, feed rate, depth of cut, and the mixture ratio of cutting fluids. 相似文献