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Algebraic modelling of 5 axis tool path motions

5 轴刀具路径运动的代数建模

基本信息

批准号：
EP/L010321/1
负责人：
Robert Cripps
金额：
$ 35.04万
依托单位：
University of Birmingham
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2014
资助国家：
英国
起止时间：
2014 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FL010321%2F1
关键词：
Algebraic modelling axis tool path

项目摘要

The use of computers to aid the manufacturing process has been long established. In particular, the use of computer numerically controlled machines to progressively remove material from a solid block to produce a finished component is now an integral part of the component industry. The hardware, software and methodologies for material removal have all matured into state of the art software packages and multi-axis machining centres. Despite this, there remains issues with machining high precision components that should require little or no finishing. There are many parameters involved in the machining process and even when optimised the physical part may exhibit unexpected errors. These may be due to a number of effects (ignoring such issues as tool wear and vibration) including: simplifications made in the computer aided manufacturing software regarding the model of the cutting tool; the need to discretise the tool to send to machine tool controller; the need for the controller to re-interpolate the required tool path and the need to control the tool to follow the (newly re-interpolated) path.To offset these effects, time consuming and expensive physical cutting trials are required in order to produce a high quality surface finish. An alternative would be to have the ability to accurately simulate the cutting process that predicts the true cutting conditions and reproduces the machined surface finish. It would be over ambitious to attempt to construct a simulation that is capable of modelling every aspect of the entire machining process in a single project. However, if a framework can be established and demonstrated for a manageable set of parameters, this could then be developed by others to incorporate other aspects including vibration, tool wear, etc. This project aims at providing such a framework for the realistic simulation of material removal using multi-axis machining tools and a robust, integrated framework for the modelling of tool path motions.Previous work at the University of Birmingham has considered the problem of determining what the actual machined part is going to be. This work was based on the principle of generating surface normals to a CAD model of the part. Machining is then simulated by using an exact model of the cutting tool and using this to truncate the normals. This has been used successfully to predict the small cusps that can remain during manufacture. It is proposed to extend this approach to deal with more complicated surface forms so that defects can be predicted and hence means for attenuating them investigated.Interest at the University of Bath has been in the use of geometric algebra to describe motions. Geometric algebra provides a framework in which rigid-body motions, both translation and rotations, can be handled in a common form. This allows techniques for free-form curves to be extended in a natural way to deal with free-form motions. It is proposed to investigate the use of the approach for describing the motion of the cutting tool and hence to improve means for interpolating (and re-interpolating) tool-path information.

利用计算机辅助制造过程的做法早已确立。特别是，使用计算机数控机床逐步从实体块中去除材料以生产成品部件现在已成为部件工业的一个组成部分。用于材料去除的硬件、软件和方法都已成熟为最先进的软件包和多轴加工中心。尽管如此，在加工高精度部件时仍然存在一些问题，这些部件应该很少或不需要精加工。加工过程中涉及许多参数，即使经过优化，物理部件也可能出现意想不到的误差。这可能是由于许多影响（忽略刀具磨损和振动等问题），包括：在计算机辅助制造软件中对刀具模型进行了简化；需要将离散刀具发送给机床控制器；控制器需要重新插入所需的刀具路径，并且需要控制刀具遵循（新重新插入的）路径。为了抵消这些影响，需要进行耗时和昂贵的物理切割试验，以产生高质量的表面光洁度。另一种选择是能够准确地模拟切削过程，预测真实的切削条件并再现加工表面光洁度。试图构建一个能够在单个项目中对整个加工过程的各个方面进行建模的仿真将是过于雄心勃勃的。然而，如果可以建立一个框架，并为一组可管理的参数进行演示，那么其他人就可以开发这个框架，以纳入其他方面，包括振动、工具磨损等。该项目旨在为使用多轴加工工具的材料去除的现实模拟提供这样一个框架，并为刀具轨迹运动建模提供一个强大的集成框架。伯明翰大学先前的工作考虑了确定实际加工零件将是什么的问题。这项工作是基于对零件的CAD模型生成表面法线的原理。然后通过使用切削刀具的精确模型来模拟加工，并使用该模型来截断法线。这已被成功地用于预测在制造过程中可能保留的小尖头。建议将这种方法扩展到处理更复杂的表面形式，以便可以预测缺陷，从而研究它们的衰减方法。巴斯大学的兴趣一直是用几何代数来描述运动。几何代数提供了一个框架，在这个框架中，刚体运动，包括平移和旋转，可以用一种共同的形式来处理。这允许自由形式曲线的技术以自然的方式扩展，以处理自由形式的运动。建议研究使用该方法来描述刀具的运动，从而改进插补（和重新插补）刀具轨迹信息的方法。

项目成果

期刊论文数量（10）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Reprametrising G4 motions

重新调整 G4 运动

DOI：
发表时间：
2016
期刊：
影响因子：
0
作者：
Cross B.
通讯作者：
Cross B.

Literature Review

DOI：
10.1007/978-981-16-2715-6_2
发表时间：
2021
期刊：
Concrete-Filled Double Skin Steel Tubular Column with Hybrid Fibre Reinforced Polymer
影响因子：
0
作者：
K. K. Choong-K.;Jayaprakash Jaganathan;S. S. Mohd Zuki-S.;S. Shahidan;N. I. R. Ramzi Hannan
通讯作者：
K. K. Choong-K.;Jayaprakash Jaganathan;S. S. Mohd Zuki-S.;S. Shahidan;N. I. R. Ramzi Hannan

Simgularities and 5-axis machining

相似性和 5 轴加工