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Normas DIN – AENOR
DIN ISO 21940-21:2013-01

DIN ISO 21940-21:2013-01

Mechanical vibration - Rotor balancing - Part 21: Description and evaluation of balancing machines (ISO 21940-21:2012) / Note: Date of issue 2013-01-14

Vibrations mécaniques - Équilibrage des rotors - Partie 21: Description et évaluation des machines à équilibrer (ISO 21940-21:2012) / Attention: Date de parution 2013-01-14

Mechanische Schwingungen - Auswuchten von Rotoren - Teil 21: Beschreibung und Bewertung von Auswuchtmaschinen (ISO 21940-21:2012) / Achtung: Erscheinungsdatum 2013-01-14

Fecha Anulación:
2013-09 /Withdrawn
Equivalencias internacionales:

ISO 21940-21 (2012-07)

Relación con otras normas DIN:

Reemplazada por: DIN ISO 21940-21:2013-09

Resumen:
This part of ISO 21940 specifies requirements for evaluating the performance of machines for balancing rotating components by the following tests: a) test for minimum achievable residual unbalance, Umar test; b) test for unbalance reduction ratio, URR test; c) test for couple unbalance interference on single-plane machines; d) compensator test. These tests are performed during acceptance of a balancing machine and also later on a periodic basis to ensure that the balancing machine is capable of handling the actual balancing tasks. For these tests, three types of specially prepared proving rotors are specified, covering a wide range of applications on horizontal and vertical balancing machines. An annex describes recommended modifications of proving rotors prepared in acccordance with ISO 2953:1985. Moreover, this part of ISO 21940 also stresses the importance attached to the form in which the balancing machine characteristics are specified by the manufacturer. Adoption of the format specified enables users to compare products from different manufacturers. Additionally, in an annex guidelines are given on the information by which users provide their data and requirements to a balancing machine manufacturer. This part of ISO 21940 is applicable to balancing machines that support and rotate rotors with rigid behaviour at balancing speed and that indicate the amounts and angular locations of a required unbalance correction in one or more planes. Therefore it is applicable to rotors with rigid behaviour as well as to rotors with shaft-elastic behaviour balanced in accordance with low-speed balancing procedures. It covers both soft-bearing balancing machines and hard-bearing balancing machines.
Keywords:
Accident prevention, Acoustics, Architraves, Balancing, Balancing machines, Bursting, Cages (machines), Cardan shafts, Casing, Characteristics, Classes of protection, Classification systems, Collecting devices, Contact, Dangerous spots, Ejection, Electric strength, Enclosures, Energy, Equipment safety, Floors, Handling, Hazards, Marking, Mass, Measuring devices, Mechanical engineering, Noise reduction, Occupational safety, Operating instructions, Pits, Power transmission systems, Properties, Protection devices, Protective measures, Rotors, Safety classification, Safety devices, Safety engineering, Safety measures, Safety requirements, Specification (approval), Speed, Testing, Unbalances, User information, Velocity, Verification, Vibration, Workplace safety
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