Compensation of reference surface errors in the machining of free form features

One of the major sources of error in machining operations is the inaccurate positioning of the workpiece in the fixture. Generally, the surface of the workpiece that is in contact with the fixture locators is used as a workpiece reference surface (WRS). Errors in the WRS can lead to improper placing...

Full description

Saved in:
Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers. Part B, Journal of engineering manufacture Journal of engineering manufacture, 2012-05, Vol.226 (5), p.824-836
Main Authors: Fallah, Meghdad, Arezoo, Behrooz
Format: Article
Language:English
Subjects:
Applied sciences
Compensation
Computer aided manufacturing
Errors
Exact sciences and technology
Fixtures
Machinery
Machining
Mathematical analysis
Mathematical models
Mechanical engineering
Mechanical engineering. Machine design
Milling industry
Simulation
Workpieces
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:One of the major sources of error in machining operations is the inaccurate positioning of the workpiece in the fixture. Generally, the surface of the workpiece that is in contact with the fixture locators is used as a workpiece reference surface (WRS). Errors in the WRS can lead to improper placing of the workpiece in the fixture and, in turn, to inaccurate machining operations. In this paper, a method is introduced that eliminates the effect of WRS errors on machined features produced in a milling operation. In the proposed method the positioning of the workpiece with consideration of WRS errors is mathematically modelled using homogenous transformation matrices. This model is then used to compensate the effect of WRS errors by modifying the machining toolpath. A post-processing workpiece error compensation module is developed that modifies the initial NC-codes that are generated from a CAM system. The presented method is verified using the simulation software NX and VERICUT and experimental studies. The results confirm that this method can be used to successfully compensate these kinds of errors.
ISSN:0954-4054
2041-2975
DOI:10.1177/0954405411431402