1、I CEN EN*2375 92 m 3404589 0024519 O m _ I EUROPEAN STANDARD EN 2375:1992 NORME EUROPENNE EUROPISCHE NORM February 1992 UDC 678.6:667.621.633:620.1:629.7 Descriptors: Aircraft industry, reinforcing materiais, preinpregnatcd products, resins, sapipling, sampling tables English version Aerospace serie
2、s - Resin preimpregnated materials - Production batch sampling procedure Srie arospatiale - btriaux primprgns de rdsine - Echantillomsge des lots de production Luft- und Raumfahrt - tiarzimprgnierte Werkstoffe - Verfahren zur Prohahue aus Fertigungs losen This European Standard was approved by CEN o
3、n 1992-02-28. CEN meabers are bound to coriply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a nations1 standard without any alteration. Up-to-date lists and bibliographical references concerning such national standsrds nay b
4、e obtained on application to the Central Secretariat or to any CEN &r. This European Standard exists in three official versions (English, French, Germ). A version in any other language Rade by translation under the responsibility of a CEM sehr into its own language and notified to thccentral Secreta
5、riat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, LuxeRbourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and Unitcd Kingdom. CEN European Cwittee for
6、 Standardization Comit Europen de Normalisation Europaisches hitee far Norriung central Secretariat: e e stauart, PIOU) Brussels Q 1992 Copyright reserved to CEN mbcrs Ref. No. EN 2375:1992 E . 1 CEN EN*2375 92 I 3404589 0024520 7 I Page 2 EN 2375 : 1992 Foreword This European Standard has been prep
7、ared by the European Association of Aerospace Manufacturers (AEC MA). After inquiries and votes carried out in accordance with the rules of this Association, this Standard has successively received the approval of the National Associations and the Official Services of the member countries of AECMA,
8、prior to its presentation to CEN. According to the Common CEN/CENELEC Rules, the following countries are bound to implement this European Standard : Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzer
9、land and United Kingdom. . CEN EN*2375 92 3404589 0024523 9 I Page 3 EN 2375 : 1992 1 Scope and field of application 7.1 used for aerospace applications. This standard specifies the method for sampling batches of resin impregnated fibre reinforcement 1.2 is not suitable for impregnated rovings. The
10、method is only applicable to impregnated woven fabrics and unidirectional reinforcement but . , 2 Definitions 2.1 Production batch A production batch of impregnated material shall consist of rolls or sheets impregnated in a continuous manufacturing operation that conforms to a fixed manufacturing pr
11、ocess and using a single mixture of resin ingredients and one type of reinforcement, simple or hybrid, of single source and constant over the whole of the batch, 2.2 Continuous manufacturing operation A continuous manufacturing operation is defined as one in which the process is not interrupted for
12、more than 24 continuous hours or by a different product run. 2.3 Elementary unit An elementary unit shall be a maximum of 50 kg. This elementary unit may consist of one roll or a number of rolls of sheets, produced in a continuous operation, unless otherwise agreed between purchaser and manufacturer
13、 3 Numbering of rolls and sheets Rolls and sheets shall be numbered in the sequence of production. . CEN EN*:2375 92 W 3404589 0024522 O -I Page 4 EN 2375 : 1992 4 Sampling 4.1 specific batch size. The sampling plan shown below indicates the number of elementary units to be taken from a Total of el
14、ementary units to be sampled Normal Statistical Number of elementary units in the batch up to 3 1 All 4 to 15 2 3 16 to 25 #4 4 26 to 40 5 5 41 to 65 7 7 4.2 method is required. The normal method shall be used unless the purchaser and manufacturer agree that thestatistical 4.3 The sampling sequence
15、shall be in accordance with the following : - 2 elementary units sampled : first and last. - Above 2 elementary units sampled : first and every - (to the lowest whole number). x-1 n where : n = number of elementary units in the batch, x = number of elementary units to be sampled. Example : 2 .e. every 8th unit (to the lowest 35 For a batch of 35 elementary units we take the first and every - 5-1 whole number), Then the elementary units to be sampled are : No. 1, No. 8, No. 16, No. 24 and No. 32.
