Modelling and compensation of fixture locators' error in CNC milling

Fixture errors are one of the error sources in machining operations. The fixture errors consist of positioning inaccuracies and errors due to workpiece and fixture deformations. Fixture locators' height error causes incorrect positioning of the workpiece in the fixture and inaccuracy in machine...

Full description

Saved in:
Bibliographic Details
Published in:International journal of production research 2013-08, Vol.51 (15), p.4539-4555
Main Authors: Fallah, Meghdad, Arezoo, Behrooz
Format: Article
Language:English
Subjects:
CNC machining
Computer numerical control
Deformation
Error analysis
error compensation
Errors
fixture
Fixtures
Locators
locators' error
Machining
Manufacturing
Mathematical models
Modelling
Numerical controls
Studies
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:Fixture errors are one of the error sources in machining operations. The fixture errors consist of positioning inaccuracies and errors due to workpiece and fixture deformations. Fixture locators' height error causes incorrect positioning of the workpiece in the fixture and inaccuracy in machined surfaces which can be much more than the locators' height error. For machining precise workpieces, it is necessary to eliminate these errors. This paper presents a method for modelling and compensating the fixture locators' height error effect on workpiece machined surfaces. In this method, the planes of workpiece actual coordinate system (ACS) are mathematically modelled in the workpiece theoretical coordinate system (TCS). Using the model, required homogenous transformation matrix for coinciding ACS with TCS and modifying machining toolpath for compensating the errors is generated. The presented model is used to develop a post-processing fixture locator error compensation module, which can modify CNC machining codes to eliminate the effect of fixture locators' height error on the workpiece machined surfaces. For verifying the presented method, machining simulations and cutting experiments have been performed in this work. The results show that the method can eliminate the effect of fixture locators' height error on the workpiece machined surfaces considerably.
ISSN:0020-7543
1366-588X
DOI:10.1080/00207543.2013.774498