M00001675
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ISO 26303 1st Edition, June 1, 2012 Machine tools - Short-term capability evaluation of machining processes on metal-cutting machine tools
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Availability date: 07/13/2021
Description / Abstract:
This International Standard defines procedures for acceptance of
metal-cutting machine tools based on the tests of their capability
in machining a specified workpiece (i.e. indirect testing). It
gives recommendations for test conditions, applicable measurement
systems and the requirements for machine tools.
This International Standard is consistent with ISO 22514 (all
parts) describing statistical methods for process management and
deals with the specific application of those methods to machine
tools and machining of a sample batch of test pieces. This
International Standard covers neither functional tests, which are
generally carried out before testing the accuracy performance, nor
the testing of the safety conditions of the machine.
Annex A gives additional information related to statistical
evaluation, (normative) Annexes B and C provide agreement and
evaluations forms for short-term capability tests, while Annex D
gives an example.
NOTE 1 Direct testing aims to investigate individual machine
properties, such as geometric or positioning accuracy. Short-term
capability evaluation is meant to prove that a machine has the
capability to fulfil a specific process task. It is, therefore,
important to recognise that the short-term capability test is
focused only on the manufactured product. This means that direct
testing methods are more suited for the determination of error
sources on the machine tool and for deriving constructive
improvements of a machine tool that is used in a wide production
spectrum; a short-term capability test is less suited for detection
of error sources of the machine tool. Therefore, it is expected
that short-term capability evaluation for the acceptance of
metal-cutting machine tools in machining processes be primarily
carried out on workpiece-dependent special-purpose machines, e.g.
working stations of transfer lines, with a process-determined cycle
time of less than 10 min, so that at least 50 workpieces are
manufactured in one shift as the statistical uncertainty increases
strongly for a smaller number. In principle, short-term capability
evaluation can also be performed on universal machines, such as
machining centres used for large batch production if they meet the
above-mentioned statistical requirements.
NOTE 2 The term "short-term capability", which is a widely used
term in machine tool industry, corresponds to the term "process
performance" specified in ISO 22514-3.