【BS英国标准】BS EN 755-6-1996 Aluminium and aluminium alloys — Extruded rodbar, tube and profiles — Part 6 Hexagonal bars, tolerances on dimensions and for

british standard bs en755-6:1996aluminium and aluminium alloys extruded rod/bar, tube and profiles part 6: hexagonal bars, tolerances on dimensions and formthe european standard en 755-6:1995 has the status of abritish standardics 77.120.10; 77.140.90bs en 755-6:1996committees responsible for thisbritish standardthe preparation of this british standard was entrusted to technical committee nfe/35, light metals and their alloys, upon which the following bodies were represented:aluminium federationaluminium stockholders associationlondon metal exchangemagnesium industry councilthe following bodies were also represented in the drafting of the standard, through subcommittees and panels:association of british welded aluminium tube makersassociation of light alloy refiners limitedinstitution of structural engineersmetal packaging manufacturers associationthis british standard, having been prepared under the direction of the engineering sector board, was published under the authority of the standards board and comes into effect on15 june 1996 bsi 12-1998the following bsi references relate to the work on this standard:committee reference nfe/35draft for comment 92/47293 dcisbn 0 580 25833 5amd. no.datecommentsamendments issued since publicationbs en 755-6:1996contentspage committees responsibleinside front cover national forewordiiforeword2text of en 755-63list of referencesinside back cover bsi 12-1998ibs en 755-6:1996national forewordthis part of bs en 755 has been prepared by technical committee nfe/35 and is the english language version of en 755-6:1995 aluminium and aluminium alloys extruded rod/bar, tube and profiles part 6: hexagonal bars, tolerances on dimensions and form.this part of bs en 755 is published with:bs en 755, aluminium and aluminium alloys extruded rod/bar, tube and profiles.bs en 755-3, round bars, tolerances on dimensions and form.bs en 755-4, square bars, tolerances on dimensions and form.bs en 755-5, rectangular bars, tolerances on dimensions and form.bs en 754, aluminium and aluminium alloys cold drawn rod/bar and tube.bs en 754-3, round bars, tolerances on dimensions and form.bs en 754-4, square bars, tolerances on dimensions and form.bs en 754-5, rectangular bars, tolerances on dimensions and form.bs en 754-6, hexagonal bars, tolerances on dimensions and form.as a result, the following standards are partially superseded by those listed above. the european standards should be used in preference whenever possible.bs 1474:1987, specification for wrought aluminium and aluminium alloys for general engineering purposes bars, extruded round tubes and sections.bs 4300, wrought aluminium alloys for general engineering purposes(supplementary series):bs 4300-4:1973, 6463 solid extruded bars and sections suitable for bright trim/reflector applications.bs 4300-5:1973, 2011 free cutting bar and wire.bs 4300-12:1969, 5454 bar, extruded round tube and sections.bs 4300-15:1973, 7020 bar, extruded round tube and sections.bs 2898:1970, specification for wrought aluminium and aluminium alloys for electrical purposes bars, extruded round tube and sections.when the following european standards are published the above britishstandards will be withdrawn.bs en 755, aluminium and aluminium alloys extruded rod/bar, tube and profiles.bs en 755-1, technical conditions for inspection and delivery.bs en 755-2, mechanical properties.bs en 754, aluminium and aluminium alloys cold drawn rod/bar and tube.bs en 754-1, technical conditions for inspection and delivery.bs en 754-2, mechanical properties.a british standard does not purport to include all the necessary provisions of a contract. users of british standards are responsible for their correct application.compliance with a british standard does not of itself confer immunity from legal obligations.summary of pagesthis document comprises a front cover, an inside front cover, pages i and ii, the en title page, pages 2 to 6, an inside back cover and a back cover.this standard has been updated (see copyright date) and may have had amendments incorporated. this will be indicated in the amendment table on the inside front cover. bsi 12-1998iieuropean standard norme europenneeuropische normen 755-6june 1995ics 77.120.10; 77.140.90descriptors: extruded products, rolled products, aluminium, aluminium alloys, metal bars, hexagonal bars, dimensions, dimensional tolerances, form tolerancesenglish versionaluminium and aluminium alloys extruded rod/bar, tube and profiles part 6: hexagonal bars, tolerances on dimensions and formaluminium et alliages daluminium barres, tubes et profils fils partie 6: barres hexagonales, tolrances sur dimensions et formealuminium und aluminiumlegierungen stranggepre te stangen, rohre und profile teil 6: sechskantstangen, grenzabma e und formtoleranzenthis european standard was approved by cen on 1995-05-14. 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 concerning such national standards may be obtained on application to the central secretariat 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 into its own language and notified to the central secretariat 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, luxembourg, netherlands, norway, portugal, spain, sweden, switzerland and united kingdom.ceneuropean committee for standardization comit europen de normalisation europisches komitee fr normungcentral secretariat: rue de stassart 36, b-1050 brussels 1995 all rights of reproduction and communication in any form and by any means reserved in all countries to cen and its members.ref. no. en 755-6:1995 een 755-6:19953 bsi 12-1998forewordthis european standard has been prepared by the technical committee cen/tc 132, aluminium and aluminium alloys, the secretariat of which is held by afnor.this european standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latestby december 1995, and conflicting national standards shall be withdrawn at the latest by december 1995.within its programme of work, technicalcommittee cen/tc 132 entrustedcen/tc 132/wg 5, extruded and drawn products, to prepare the following standard:en 755-6, aluminium and aluminium alloys extruded rod/bar, tube and profiles part 6: hexagonal bars, tolerances on dimensions and form.this standard is part of a set of nine standards. the other standards deal with:en 755-1, aluminium and aluminium alloys extruded rod/bar, tube and profiles part 1: technical conditions for inspection and delivery.en 755-2, aluminium and aluminium alloys extruded rod/bar, tube and profiles part 2: mechanical properties.en 755-3, aluminium and aluminium alloys extruded rod/bar, tube and profiles part 3: round bars, tolerances on dimensions andform.en 755-4, aluminium and aluminium alloys extruded rod/bar, tube and profiles part 4: square bars, tolerances on dimensions and form.en 755-5, aluminium and aluminium alloys extruded rod/bar, tube and profiles part 5: rectangular bars, tolerances on dimensions and form.en 755-7, aluminium and aluminium alloys extruded rod/bar, tube and profiles part 7: seamless tubes, tolerances on dimensions and form.en 755-8, aluminium and aluminium alloys extruded rod/bar, tube and profiles part 8: porthole tubes, tolerances on dimensions and form.en 755-9, aluminium and aluminium alloys extruded rod/bar, tube and profiles part 9: profiles, tolerances on dimensions and form.according to the cen/cenelec internal regulations, 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, switzerland, united kingdom.contentspageforeword21scope32tolerances on dimensions and form32.1width across flats 32.2corner radii 32.3convexity concavity32.4straightness 32.5twist 42.6length42.7squareness of cut ends43alloy groups4figure 1 measurement of deviation from straightness 3figure 2 measurement of twist 4table 1 tolerances on width across flats 3table 2 maximum corner radii 3table 3 straightness tolerances3table 4 twist tolerances4table 5 fixed length tolerances4table 6 alloy groups51 scopethis part of en 755 specifies the dimension and form tolerances for aluminium and aluminium alloy extruded hexagonal bars having widths across flats in the range from 10 mm up to 220 mm.2 tolerances on dimensions and form2.1 width across flatsthe tolerances on width across flats are specified in table 1.for the purposes of this european standard the alloys are distributed into two groups which correspond to varying difficulty when manufacturing the products.the division into group i and group ii of the most commonly used general engineering alloys is specified in table 6.table 1 tolerances on width across flatswidth across flats stolerancesoverup toalloy group ialloy group ii1018 0,22 0,301825 0,25 0,352540 0,30 0,404050 0,35 0,455065 0,40 0,506580 0,50 0,7080100 0,55 0,90100120 0,65 1,0120150 0,80 1,2150180 1,0 1,4180220 1,15 1,7dimensions in millimetres2.2 corner radiimaximum corner radii are specified in table 2.table 2 maximum corner radiidimensions in millimetreswidth across flats smaximum corner radiioverup to10301,530602,060802,5801203,01201804,01802205,02.3 convexity concavitythe convexity concavity tolerances for hexagonal bar shall be included within the width-across-flats tolerances.2.4 straightnessdeviations from straightness, hs and ht, shall be measured as shown in figure 1 with the bar placed on a horizontal baseplate so that its mass decreases the deviation.straightness tolerances are specified in table 3. the straightness tolerances apply to bars in alltempers except o and t 510. if a straightnesstolerance is required for either o or t 510 temper, it shall be agreed between purchaser and supplier.table 3 straightness tolerancesdimensions in millimetreswidth across flats smaximum deviation from straightness ht mm/mmaximum localized kink in any 300 mm portion hsoverup to108020,88012021,012022031,5figure 1 measurement of deviation from straightness5 bsi 12-19982.5 twistthe twist measurement shall be carried out as shown in figure 2.the twist tolerances are specified in table 4.the twist tolerances apply to bars in all tempers except o and t 510. if a twist tolerance is required for either o or t 510 temper, it shall be agreed between purchaser and supplier.table 4 twist tolerancesdimensions in millimetrestable 5 fixed length toleranceswidth across flats stolerances on lengthfromup to and includingl 2 0002 000 5 000100+ 50+ 70+100100200+ 70+ 90+120200220+ 80+110+140dimensions in millimetreswidth across flats stwist tolerances toverup toper 1 000 mm of lengthover the total length103011,530801,52,580120231202202,542.6 lengthif fixed lengths are to be supplied, this shall beif no fixed or minimum length is specified in the order, hexagonal extruded bars may be delivered in random lengths. the actual lengths and tolerances on random lengths shall be agreed between purchaser and supplier.2.7 squareness of cut endsthe squareness of cut ends shall be within half of the fixed-length tolerance range (table 5) for both fixed and random lengths, e.g. for a fixed lengthstated on the order. the fixed length tolerances aretolerance of +100mm, the squareness of cut endsspecified in table 5.shall be within 5 mm.3 alloy groupsthe division into group i and group ii of the most commonly used general engineering alloys is specified in table 6. grouping of other alloys is subject to agreement between purchaser and supplier.figure 2 measurement of twisttable 6 alloy groupsgroup ien aw-1050a, en aw-1070a, en aw-1200, en aw-1350en aw-3003, en aw-3103en aw-5005, en aw-5005a, en aw-5051a, en aw-5251en aw-6101a, en aw-6101b, en aw-6005, en aw-6005a, en aw-6106, en aw-6012, en aw-6018, en aw-6351, en aw-6060, en 6061, en aw-6261, en aw-6262,en aw-6063, en aw-6063a, en aw-6463, en aw-6081, en aw-6082group iien aw-2007, en aw-2011, en aw-2011a, en aw-2014, en aw-2014a, en aw-2017a, en aw-2024, en aw-2030en aw-5019a, en aw-5052, en aw-5154a, en aw 5454, en aw-5754, en aw-5083, en aw-5086en aw-7003, en aw-7005a, en aw-7020, en aw-7022, en aw-7049a, en aw-7075a en aw-5019 is the new designation for en aw-5056a.6blankbs en 755-6:1995list of referencessee national foreword. bsi 12-1998bsi389 chiswick high roadlondonw4 4al| bsi british standards institution| bsi is the independent national body responsible for preparing british standards. it| presents the uk view 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