共查询到19条相似文献,搜索用时 203 毫秒
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《机械制造与自动化》2017,(3)
并联机床在进行运动控制时,必须通过位置反解模型,将刀具位姿及速度信息变换为伺服系统各杆杆长的控制指令,所以传统的数控代码不能直接应用在并联机床上。并联机床后置处理器的功能是根据刀位数据文件和机床特性文件,得到机床数控系统能够接受的程序代码。介绍了一种三平动并联机构-3-(2SPS)并联铣床,基于此机构阐述其后置处理,并研究其后置处理过程的一些关键算法。 相似文献
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因为并联机床结构的特殊性 ,通用的刀具轨迹后置处理程序无法生成并联机床的数控指令。本文研究基于并联机床的Pro/E后置处理系统的开发 ,解决并联机床编程困难的问题 ,提出后处理的流程和相关算法。 相似文献
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5轴混联加工单元因其高刚性、快速响应及灵活调姿等优点,已被视为复杂铝合金结构件高效加工的一种替代方案。后置处理是改善此类装备加工能力的重要环节。以一种新型5轴混联加工单元为研究对象,提出一种可提高其加工件表面质量的后置处理算法。首先,基于B样条曲线构造一种双参数曲线插补算法,进行刀尖和刀轴轨迹的光顺处理,并采用参数同步化保证刀尖点与刀轴点的同步插补。其次,通过推导混联加工单元的速度映射模型,构造驱动轴的速度分配算法以确保刀尖进给速度的稳定性;接着,运用混联加工单元的位置逆解与速度分配策略,将其末端的进给速度、光顺处理后的刀尖插补点及刀轴插补点转换成驱动轴的位置与速度运动控制点集,实现混联加工单元刀具轨迹的后置处理;最后,基于前期开发的实验样机开展一组S形试件的切削实验,验证所提后置处理算法的有效性。 相似文献
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在分析 5 UPS/PRPU 5自由度并联机床机构的基础上 ,介绍了并联机床运动控制的基本原理 ,确定了具体的运动控制算法 ,将输入控制系统的数控刀位数据转化为驱动轴的控制指令 ,从而实现对机床加工过程中刀具位姿的控制。根据该算法编制的数控软件已成功地应用于实际的并联机床控制 ,取得了较好的效果。 相似文献
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在机械制造领域,混联机床结合了并联机床和传统机床的主要优点,它既有高的刚度,也有大的工作空间,混联机床成为下一代机床极佳的选择.根据三自由度(3 -DOF)空间并联机构的运动学求解特点,将已提出和应用的3-DOF空间并联机构分为四类,并在分类的基础上提出一种新型的混联机床,它是由一个空间三自由度(两个移动和一个转动)的... 相似文献
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在机械制造领域,混联机床结合了并联机床和传统机床的主要优点,它既有高的刚度,也有大的工作空间,它作为加工机床的理想补充已被许多学者接受。一种新型的混联机床是由一个空间三自由度(两个移动和一个转动)的并联机构和一个XY平面二自由度(两个移动)的工作平台组成,可以作为高速多自由度的加工中心,扩大机床的加工范围。对空间三自由度的并联机构的正向运动学和逆向运动学进行了分析和研究,并使用MATLAB软件编程,给出了数值实例。 相似文献
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在分析研究了虚拟轴机床的结构和坐标转换关系的基础上,针对清华大学研制的6-PSS型虚拟轴机床,提出了刀位后处理计算方法,包括刀轴矢量与机床坐标夹角的计算和NC数据的计算;为编制虚拟轴机床数控后处理程序提供一条捷径. 相似文献
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S.-L. Chen Y.-C. Liu 《The International Journal of Advanced Manufacturing Technology》2001,18(4):254-265
A coordinate system with multiple non-orthogonal axes, defined for a parallel-link machine tool is very different from that
for a conventional serial-type machine. Therefore, a special post-processor that can automatically transfer the cutter location
data (CL-data) into machine specific NC commands is essential for real machining applications of a parallel-link machine tool.
Parallel-link machine tools have been investigated by many previous workers. However, work on the theory of post-processors
for this machine tool is very sparse, and most is focused on the orthogonal serial motion. The potential benefits of the parallel-link
machine tools make work necessary and urgent on the transformation of the CL-data from a CAD/CAM system into NC commands for
special parallel-link machine tools. A six degrees-of-freedom (DOF) parallel-link machine tool constructed as a 6-3-3 mechanism
was selected in this work to investigate the theory of post-processing, and the effects of the cutter shapes and the machine
construction on it. The parametric representations of different cutter shapes defined by the DIN standard were adopted in
the work, increasing the usefulness of the post-processor theory developed. Specific parameters must be modified in the post-processor
for different tools applied for real cutting. The tilt angle and yaw angle of the cutter, relative to the normal direction
of the cutting surface, is also included in the theory. Finally, the NC code is generated using LabVIEW software, and simulations
were performed to investigate the correctness based on several designed tool paths. 相似文献
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Adam Gąska Marcin Krawczyk Robert Kupiec Ksenia Ostrowska Piotr Gąska Jerzy Sładek 《The International Journal of Advanced Manufacturing Technology》2014,71(1-4):497-507
It is complex and divergent for the conventional motion controllers to process various G codes using different interpolation algorithms. This impairs programming efficiency and robustness of the controller. In this paper, we propose the universal non-uniform rational B-splines (NURBS)-based interpolator which can simplify the architecture of interpolation in spite of interpreting different kinds of inputs. Direct conversion of long G01 and G02/G03 numerical control (NC) segments to NURBS segment is first implemented. The fitting of multiple short segments into a continuous and smooth NURBS segment is then carried out. More importantly, the universal NURBS-based interpolator utilizes the Cox–de Boor algorithm which is highly efficient and can take advantage of the parallel computing scheme to accelerate the processing speed. Furthermore, due to the construction of real-time environment, the proposed algorithm enables interpretation, look-ahead functions, and motion control to work simultaneously. A 2D NC program possessing hundreds of short G01 segments and long segments (i.e., G02, G03, and long G01) is tested on an in-house developed XY-table with a PC-based motion controller. The results have shown the effectiveness and feasibility of the proposed real-time NURBS-based interpolator. 相似文献