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Homepage>BS Standards>25 MANUFACTURING ENGINEERING>25.080 Machine tools>25.080.01 Machine tools in general>21/30421428 DC BS ISO 26303. Machine tools. Short-term capability evaluation of machining processes on metal-cutting machine tools
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21/30421428 DC BS ISO 26303. Machine tools. Short-term capability evaluation of machining processes on metal-cutting machine tools

21/30421428 DC

BS ISO 26303. Machine tools. Short-term capability evaluation of machining processes on metal-cutting machine tools

CURRENCY
29.76 USD
Standard number:21/30421428 DC
Pages:53
Released:2021-02-23
Status:Draft for Comment
DESCRIPTION

21/30421428 DC


This standard 21/30421428 DC BS ISO 26303. Machine tools. Short-term capability evaluation of machining processes on metal-cutting machine tools is classified in these ICS categories:
  • 25.080.01 Machine tools in general

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 tool.

Annex A gives additional information related to statistical evaluation, 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 tool properties, such as geometric or positioning accuracy. Short-term capability evaluation is meant to prove that a machine tool 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 machine tools, 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.