ISO 6621-5-2020 pdf free

04-19-2021 comment

ISO 6621-5-2020 pdf free.Internal combustion engines —Piston rings — Quality requirements.
This document specifies quality aspects that can be defined but that are not normally found on adrawing specification.
lt covers the following:single-piece piston rings of grey cast iron or steel; multi-piece piston rings (oil control rings) consisting of cast iron parts and spring components; andsingle-piece and multi-piece oil control rings of steel, .e. oil control rings in the form of strip steelcomponents or steel segments (rails) with spring expander components.
In addition to specifying some of the limits of acceptance relating to inspection measuring principles(covered by IS0 662i-2), this document also covers those features for which no recognized quantitativemeasurement procedures exist and which are only checked visually with normal eyesight (glasses ifworn normally) and without magnification.Such features (superficial defects) are additional to thestandard tolerances of ring width, radial wall thickness and closed gap.
This document does not establish acceptable quality levels (AQL), it being left to manufacturer andcustomer to decide the appropriate levels jointly.In this case, the recommendations of lSO 2859-1 arefollowed.
This document specifies the quality requirements of piston rings for reciprocating internal combustionengines for road vehicles and other applications. lt is applicable to all such rings of a nominal diameterfrom 30 mm up to and including 200 mm.
2Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document.For dated references, only the edition cited applies. Forundated references, the latest edition of the referenced document (including any amendments) applies.
Visible defects are divided into two principle classes as described in 4.2 to 4.5.
The first class covers those defects frequently found in castings and includes such defects as porosity,sand inclusions, cavities, etc.
The second class of defect covers mechanical abrasions which may occur during forming, machining orhandling of the rings,and includes scratches, dents,chipping, burrs and cracks.Inspection of piston rings for such defects is generally carried out visually,without magnification, byinspectors having normal eyesight, corrected if necessary.
lt is not intended that every ring be rigorously inspected for size and distribution of defects, but ratherthat the values given in the tables and text be used as a general guide. However, in case of doubt, thevalues given should be used as the means of judging the quality of the rings.ISO 6621 pdf download.

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