零件加工误差原因诊断专家系统

将专家系统应用于零件加工误差原因的分析与诊断，基于加工过程中产生的某些误差，提出可能的误差原因，然后进行逼近和排除，最后诊断出产生加工误差的原因。     

数控插齿机加工误差探讨

重点介绍数控插齿机加工误差产生的原因现象,分析误差产生的原因,采取适当措施,减小数控插齿机的加工误差,提高数控插齿机的加工精度,以便为后期的技术攻关指明方向。     

数控机床产生加工误差的原因及其改善措施

分析了数控机床产生加工误差原因,并指出了减少加工误差的相应措施.     

成形车刀加工锥体工件产生的双曲线误差的修正

用普通成形车刀加工锥体工件要产生双曲线误差。实践证明,双曲线误差往往使加工后的工件超差。目前虽有几种减小双曲线误差的方法,但不理想,因各种方法对圆体成形车刀自身造成双曲线误差都不能减小,而自身造成误差一般占整个双曲线误差的95％。有必要寻求一种新的方法减小这种误差。双曲线误差产生的原因是因为用带有前角的普通成形车刀加工锥体时,前刀面与锥体表面的交线是一条外凸的双曲线,要加工     

数控机床螺距误差补偿

螺距误差是造成数控机床加工精度下降的重要原因之一,在分析螺距误差的产生原因之后,给出数控机床螺距误差补偿的原理和补偿步骤。运用此误差补偿方法对一台配备SINUMER IK 802S/C系统数控机床螺距误差补偿后,获得了理想的加工精度。     

普通车床加工误差补偿控制问题的浅议

结合普通车床的数控改造,探讨车削力产生的加工误差补偿问题.简要介绍加工误差产生的原因、以及加工误差补控制的概念、提出了借助数控系统在普通车床上实现加工误差自动补偿的总体方案和软件方案.     

车削加工圆度误差预测

针对车削加工时工件装夹的偏心、工件本身的圆度误差、机床主轴的径向圆跳动误差等因素对车削加工产生圆度误差的影响,分析得出了影响车削加工圆度误差的主要影响因素以及车削加工时产生棱圆的原因.对车削加工圆度误差进行了预测,并对理论预测与实际加工结果进行了对比.     

数控机床伺服系统跟随误差对加工轮廓的影响

从数控机床伺服系统特性出发,分析了跟随误差产生的原因,论述了在加工圆弧轮廓时跟随误差与轮廓误差之间的关系,推导出了具体的计算公式,并提出了采用高精度复合控制的方法减小跟随误差,从而减小其对加工轮廓的影响.实践证明,该方法具有一定的可行性.     

泵壳内孔椭圆形误差主源的分析与诊断

对泵壳内孔的椭圆形误差，从实际加工数据中提取误差特征，通过理论分析列出误差原因，进而可诊断出误差的主源。     

定位误差计算的分析研讨

定位误差的大小决定工件的加工精度能否满足加工要求。分析了定位误差的产生原因，说明了定位误差的计算过程和步骤，并讨论了几种典型定位方式的定位误差。     

加工中心热误差补偿的研究

热误差是加工中心的最大误差源。通过对机床热特性的实验和分析，利用神经网络模型对热误差进行了补偿，取得比较好的效果。     

Repetitive Measurement and Compensation to Improve Workpiece Machining Accuracy

Achieving workpiece high accuracy at low cost is one of the greatest challenges in the manufacturing industry. A repetitive error measurement and compensation scheme to improve the workpiece diameter accuracy for machining centres is des-cribed. The scheme entails an on-machine measurement and error compensation technology between machining processes. The workpiece diameters are measured along the workpiece length by using a fine touch sensor. The workpiece diameters in the compensation program are modified for implementation of next pass error correction. The technology is realised on a CNC turning centre. This method works well in hard machining and turned workpieces with large length–diameter ratios where the machining process induced errors are significantly greater than errors from other sources. It demonstrates that the work-piece can obtain maximum possible machining accuracy by this repetitive measurement and compensation technique.     

切点跟踪磨削法中工件的刚度误差分析及其补偿

采用切点跟踪磨削法加工曲轴类零件时,曲轴的刚度误差是造成加工误差和影响磨削效率进一步提高的主要原因之一。为了采取恰当的误差补偿策略来减小或消除刚度误差的不利影响,分析了切点跟踪磨削法磨削曲轴连杆颈时曲轴不同方向上的弹性位移对加工精度的影响规律,并由此建立了曲轴刚度误差补偿的数学模型;同时给出了测定磨削过程中曲轴弹性变形量的一般方法。     

Error budget and uncertainty analysis of portable machines by mixed experimental and virtual techniques

This paper analyzes the error sources of portable machines, which can move along large parts to perform machining operations and defines a mixed virtual-experimental model to quantify such errors. The method combines three different aspects of particular relevance in portable machines: a process force and machine stiffness model, a geometric error model and a machine and work piece inter-referencing error model. The combination of these models helps to control and define the effects of different errors in the virtual mobile machine, before a real prototype is built. An application to a particular portable machine is presented where error values are either simulated or experimentally obtained from a conventional three-axis milling machine where typical strategies of mobile machines are implemented and tested. The research shows that portable machines can be a solution for automatic and unattended machining operations with accuracy requirements below 0.1 mm.     

柔性铰链微操作机构的误差源分析

深入分析了微操作机构的各种误差源机理及作用规律 ,提出了减小微操作机构误差、提高操作精度的措施 ,为高精密的柔性微操作机构设计、加工及装配提供了理论依据 ,也为进行精度测试及实现控制算法打下基础     

并联机床加工精度保障体制

文章对并联机床加工精度的保障系统进行了介绍,该系统涉及分辨率分析、复位位置保证、结构参数标定、工件坐标系建立、刀具长度检测、非线性误差控制、加工零件表面测量以及加工数据基准修正等多个环节,贯穿于机床的设计、制造、控制及加工产品检验等整个过程中.     

几何形误差对气体静压圆柱轴承运动精度的影响

几何形误差是影响气体静压圆柱轴承运动精度的主要因素之一。本文从理论上研究了气体轴承副零件因加工过程中形成的几何形误差对气体静压圆柱轴承运动精度的影响,并且,对轴颈具有加工误差时气体静压圆柱轴承的运动精度进行了研究,给出了轴颈的几何形误差与轴承运动精度关系的表达式,为轴承运动精度的理论分析提供了可靠的依据。     

基于进给速度修调的轮廓误差控制研究

在分析进给速度对轮廓误差影响的基础上,提出了一种基于进给速度自动修调的轮廓误差控制方法,并设计了相应的轮廓误差控制器。通过其在西门子840D数控机床上的应用,可以有效控制加工过程中的轮廓误差,从而为进一步提高工件轮廓加工精度提供了重要的方法与理论依据。     

A new high-efficiency error compensation system for CNC multi-axis machine tools

To enhance the accuracy of CNC machines for the request of modern industry, an effective static/quasi-static error compensation system composed of an element-free interpolation algorithm based on the Galerkin method for error prediction, a recursive software compensation procedure, and an NC-code converting software, is developed. Through automatically analyzing the machining path, the new error prediction method takes into consideration the fact that the machine structure is non-rigid, and can efficiently determine the position errors of the cutter for compensation without computing a complex error model on-line. The predicted errors are then compensated based on a recursive compensation algorithm. Finally, a compensated NC program will be automatically generated by the NC-code converting software for the precision machining process. Because of the advantage of the element-free theory, the error prediction method can flexibly and irregularly distribute nodal points for accurate error prediction for a machine with complex error distribution characteristics throughout the workspace. To verify the algorithm and the developed system, cutting experiments were conducted in this study, and the results have shown the success of the proposed error compensation system.