1、BSI Standards PublicationBS EN ISO 4490:2014Metallic powders Determination of flow rate bymeans of a calibrated funnel(Hall flowmeter)BS EN ISO 4490:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 4490:2014.It supersedes BS EN ISO 4490:2008 which is wit
2、hdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee ISE/65, Sintered metal components.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract
3、. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 84787 5ICS 77.160Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of
4、 theStandards Policy and Strategy Committee on 31 August 2014.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 4490 August 2014 ICS 77.160 Supersedes EN ISO 4490:2008English Version Metallic powders - Determination of flow rate by means of
5、 a calibrated funnel (Hall flowmeter) (ISO 4490:2014) Poudres mtalliques - Dtermination du temps dcoulement au moyen dun entonnoir calibr (appareil de Hall) (ISO 4490:2014) Metallpulver - Ermittlung der Durchflussdauer mit Hilfe eines kalibrierten Trichters (Hall flowmeter) (ISO 4490:2014) This Euro
6、pean Standard was approved by CEN on 30 July 2014. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references conc
7、erning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member in
8、to its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France,
9、Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITE
10、E FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 4490:2014 EBS EN ISO 4490:2014EN ISO 4490:2014 (E) 3 Foreword This document (EN ISO 4490:2014) h
11、as been prepared by Technical Committee ISO/TC 119 “Powder metallurgy”. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2015, and conflicting national standards shall be withdrawn at the
12、latest by February 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 4490:2008. According to the C
13、EN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hung
14、ary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 4490:2014 has been approved by CEN as EN ISO 4490:2014 without any mod
15、ification. BS EN ISO 4490:2014ISO 4490:2014(E) ISO 2014 All rights reserved iiiContents PageForeword iv1 Scope . 12 Principle 13 Apparatus . 14 Calibration of the funnel. 34.1 Calibration by the manufacturer of the funnel 34.2 Calibration by the user of the funnel 35 Sampling 36 Procedure. 37 Expres
16、sion of results 48 Precision . 49 Test report . 4BS EN ISO 4490:2014ISO 4490:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out throu
17、gh ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collabora
18、tes closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval cr
19、iteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject
20、of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade nam
21、e used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technica
22、l Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 119, Powder metallurgy, Subcommittee SC 2, Sampling and testing methods for powders (including powders for hardmetals).This fourth edition cancels and replaces t
23、he third edition (ISO 4490:2008), of which it constitutes a minor revision with the following changes: a note has been added in 3.1; “stopwatch” replaced with “timing device” in 3.4.iv ISO 2014 All rights reservedBS EN ISO 4490:2014INTERNATIONAL STANDARD ISO 4490:2014(E)Metallic powders Determinatio
24、n of flow rate by means of a calibrated funnel (Hall flowmeter)1 ScopeThis International Standard specifies a method for determining the flow rate of metallic powders, including powders for hard metals, by means of a calibrated funnel (Hall flowmeter).The method is applicable only to powders which f
25、low freely through the specified test orifice.2 PrincipleMeasurement of the time required for 50 g of a metallic powder to flow through the orifice of a calibrated funnel of standardized dimensions.3 Apparatus3.1 Calibrated funnel, having the dimensions shown in Figure 1 (see Clause 4).The funnel sh
26、all be made of a non-magnetic, corrosion-resistant metallic material having sufficient wall thickness and hardness to withstand distortion and excessive wear.1)NOTE The dimensions shown for the funnel, including the orifice, are not to be considered controlling factors. Calibration with emery, as sp
27、ecified in Clause 4, determines the working flow rate of the funnel.3.2 Stand and horizontal vibration-free base, to support the funnel rigidly, e.g. as indicated in Figure 2.1)3.3 Balance, of sufficient capacity, capable of weighing the test portion to an accuracy of 0,05 g.3.4 Timing device, capab
28、le of measuring the elapsed time to an accuracy of 0,1 s.3.5 Chinese emery grit, a reference powder used for calibration of the funnel.1)1) Apparatus complying with 3.1 and 3.2, and standard Chinese emery grit can be purchased from ACuPowder International, LLC, 901 Lehigh Avenue, Union, NJ 07083, US
29、A. This information is given for the convenience of users of this International Standard and does not constitute an endorsement by ISO of the company named above. Equivalent products may be used if they can be shown to lead to the same results. ISO 2014 All rights reserved 1BS EN ISO 4490:2014ISO 44
30、90:2014(E)Dimensions in millimetres6550,81860aDb55203,2 0,155,2601Key1 polished to Ra 0,4 maThis value is mandatory.bD =+25002,Figure 1 Calibrated funnel (Hall flowmeter)Figure 2 Arrangement of calibrated funnel and stand2 ISO 2014 All rights reservedBS EN ISO 4490:2014ISO 4490:2014(E)4 Calibration
31、of the funnel4.1 Calibration by the manufacturer of the funnelThe manufacturer shall supply the flowmeter calibrated as follows.a) Dry the Chinese emery grit (3.5) in an open and clean glass jar at 110 C for 60 min in air.b) Cool the emery to room temperature in a desiccator.c) Weigh out 50 g of the
32、 emery grit.d) Follow the procedure outlined in Clause 6.e) Repeat the procedure with the same 50 g mass of emery, until there are five determinations within 0,4 s.f) The average of these five determinations is stamped on the bottom of the funnel and shall be within 40,0 s 0,5 s.The Chinese emery gr
33、it used as the reference powder replaces the Turkish emery grit from the first edition of this International Standard, as the latter is no longer available. The Chinese emery has been found to be more sensitive and the instructions should therefore be followed carefully.4.2 Calibration by the user o
34、f the funnelThe flow rate of the reference sample shall be determined by the above method. If the flow rate has changed to be outside 40,0 s 0,5 s, a correction factor shall be used when measuring different powders. This correction factor is obtained by dividing 40,0 by this new value for the Chines
35、e emery grit.It is recommended that the users periodically verify whether a correction is needed or not.It is recommended that, before a correction factor is adopted, the cause of the change be investigated. If the flow rate has decreased, it is probable that repeated use has burnished the orifice a
36、nd a (new) correction factor is justified. An increase in flow rate may indicate a coating of soft powder on the orifice. This coating should be carefully removed and the calibration test repeated.It is recommended that the use of a funnel be discontinued after the duration of flow of the reference
37、sample has decreased to less than 37 s.5 Sampling5.1 The mass of the test sample shall be at least 200 g.5.2 In general, the powder shall be tested in the as-received condition. In certain cases, and after agreement between the supplier and user, the powder may be dried. However, if the powder is su
38、sceptible to oxidation, the drying shall take place in a vacuum or in inert gas. If the powder contains volatile substances, it shall not be dried.5.3 Immediately before the test, weigh out a 50 g 0,1 g test portion.5.4 The determination shall be carried out on three test portions.6 ProcedureTransfe
39、r the test portion to the funnel, keeping the discharge orifice closed by a dry finger. Take care that the stem of the funnel is filled with powder. Start the timing device (3.4) when the orifice is opened and ISO 2014 All rights reserved 3BS EN ISO 4490:2014ISO 4490:2014(E)stop it at the instant wh
40、en the last of the powder leaves the orifice. Record the elapsed time measured to the nearest 0,1 s.Alternatively, the orifice can be kept open, when the test portion is transferred to the funnel with the rest of the procedure being the same.NOTE If the powder does not begin to flow when the orifice
41、 is opened, one slight tap on the funnel to start the flow is permitted. If this has no effect, or if the flow stops during the test, the powder is considered to possess no flowability according to the test method described in this International Standard.7 Expression of resultsCalculate the arithmet
42、ic mean of the results of the three determinations and report the value in seconds per 50 g, rounded to the nearest second. If a correction factor (see 4.2) should be used, the average shall be multiplied by this correction factor.8 PrecisionThere are no relevant data available for this issue.9 Test
43、 reportThe test report shall include the following information:a) a reference to this International Standard (i.e. ISO 4490);b) all details for identification of the test sample;c) the result obtained;d) the use of an open orifice;e) all operations not specified by this International Standard, or re
44、garded as optional (e.g. the drying procedure applied and whether flow has been induced by tapping the funnel);f) details of any occurrence which may have affected the result.4 ISO 2014 All rights reservedBS EN ISO 4490:2014This page deliberately left blankThis page deliberately left blankBSI is the
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