Tolerances for aluminium alloy-extruded profiles according to EN 755-9 and EN 12020-2 versus definitions of tolerances according to the ISO GPS system
 
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1
Institute of Machine Design Fundamentals, Warsaw University of Technology, Poland
 
2
Research & Development, AutoStore Sp. z o.o., Poland
 
 
Submission date: 2020-12-02
 
 
Final revision date: 2021-02-23
 
 
Acceptance date: 2021-02-26
 
 
Online publication date: 2021-03-29
 
 
Publication date: 2021-03-29
 
 
Corresponding author
Zbigniew Humienny   

Institute of Machine Design Fundamentals, Warsaw University of Technology, Narbutta 84, 02-524, Warszawa, Poland
 
 
Journal of Machine Engineering 2021;21(1):121-132
 
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ABSTRACT
The inconsistencies between tolerances for aluminium profiles as specified in EN 755-9:2016 along with EN 12020-2:2016 and tolerance concepts defined in ISO 1101:2017 are demonstrated. It is shown that the standards defining requirements for extruded profiles have been developed without considering provisions in the ISO GPS system. A number of ambiguities in EN 755-9 and EN 12020-2 that were overcome in the ISO GPS system are shown. For example, broad application of plus/minus tolerancing for step dimensions does not provide unique verification of aluminium alloy-extruded profiles. It is pointed out that some terms univocally defined in the ISO GPS system are used incorrectly in both standards. It makes it difficult for a customer to verify on CMM whether or not extruded profiles satisfy the requirements specified in the order. Finally, significant changes regarding geometrical tolerancing in standards for the aluminium alloy-extruded profiles are proposed.
 
REFERENCES (18)
2.
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3.
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eISSN:2391-8071
ISSN:1895-7595
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