1、October 2010DEUTSCHE NORM DIN-Normenausschuss Rundstahlketten (NRK)DIN-SprachendienstEnglish price group 10No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sal
2、e for German Standards (DIN-Normen).ICS 53.040.20!%R*“2274707www.din.deDDIN 764-1Round steel link chains Round steel link chains for chain conveyors Part 1: Grade 3,English translation of DIN 764-1:2010-10Rundstahlketten Rundstahlketten fr Kettenfrderer Teil 1: Gteklasse 3,Englische bersetzung von D
3、IN 764-1:2010-10Chanes en acier de section ronde Chanes en acier de section ronde pour conveyeurs chane Partie 1: Classe 3,Traduction anglaise de DIN 764-1:2010-10Partially supersedesDIN 764-1:1992-09See start of applicationwww.beuth.deDocument comprises 15 pages11.15DIN 764-1:2010-10 2 A comma is u
4、sed as the decimal marker. Start of application The start of application of this standard is 2010-10-01. Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 4 4 Dimensions and designation 6 5 Material . 8 6 Surface condition. 8 7 Safety requirements 8 8 Manufacturin
5、g proof test 9 9 Final test . 10 10 Acceptance test . 10 11 Marking . 10 12 Test certificate 10 13 Use 10 Annex A (informative) Bases of calculation . 11 Annex B (informative) Examples of application . 14 Bibliography 15 DIN 764-1:2010-10 3 Foreword This document has been prepared by Working Committ
6、ee NA 085-00-02 AA Rundstahlketten fr allgemeine Zwecke of the Normenausschuss Rundstahlketten (NRK) (Round Steel Link Chains Standards Committee). For additional information regarding the NRK, visit us on the internet at www.nrk.din.de. In Clauses 7 and 8, this standard includes safety requirements
7、 within the meaning of the Gerte- und Produktsicherheitsgesetz (GPSG) (German Equipment and Product Safety Act). Annex A and Annex B are informative. The present standard has been prepared in close cooperation with the Fachausschuss Metall und Oberflchenbehandlung of the Deutsche Gesetzliche Unfallv
8、ersicherung (German Social Accident Insurance), Section Umgang mit Seilen, Ketten und Anschlagmitteln (Use of wire ropes, chains and chain slings), lead-managed by the Berufsgenossenschaft Metall Nord Sd (Metall Nord Sd Employers liability insurance association). It specifies safety requirements bas
9、ed on the ratios of mean stress at working force to mean stress at manufacturing proof force and to mean stress at breaking force, and also on the manufacturing proof test to be carried out for each chain. In connection with DIN 685-2, this standard falls within the scope of the Gerte- und Produktsi
10、cherheitsgesetz (GPSG) and is therefore to be considered as an acknowledged rule of technology within the meaning of this Act. DIN 764 Round steel link chains Round steel link chains for chain conveyors consists of the following parts: Part 1: Grade 3 Part 2: Grade 5 Part 3: Grade 7 (at present unde
11、r preparation) Amendments This standard differs from DIN 764-1:1992-09 as follows: a) case hardened round steel link chains of grade 2 have been included in DIN 5696-1; b) round steel link chains of grade 2 that have not been case hardened have been replaced by round steel link chains of grade 3; c)
12、 nominal size 28 98 has been dropped; d) the division of tolerances on pitch and gauge length has been changed (see Annex A); e) the manufacturing proof force values have been increased; f) the title of the standard has been changed; g) in the German original the term “Zugkraft” has been changed to
13、“Betriebskraft” (the English translation of this term, “tensile force”, has been changed accordingly to “working force”); h) in the German original the term “lehrenhaltig” has been changed to “eng toleriert” (the English translation of this term, “calibrated”, has been changed accordingly to “small
14、tolerance”); i) the standard has been editorially revised. Previous editions DIN 670: 1924-04, 1928-07 DIN 764: 1932-09, 1940-02, 1942-12, 1955-03, 1971-01 DIN 764-1: 1982-01, 1992-09 DIN 764-1:2010-10 4 1 Scope This standard specifies dimensions and mechanical properties of tested, small tolerance
15、round steel link chains of grade 3, with a nominal pitch t = 3,5 d (see Annex A). Chains according to this standard are mainly used for applications where they will be subjected to tension in chain conveyors, as defined in DIN 15201-1. Chains as specified here shall not be used as lifting accessorie
16、s, slings or loadbearing devices within the meaning of DIN 15003 in combination with cranes or hoists (further information on the use of round steel chains is given in Clause 13). 2 Normative references The following referenced documents are indispensable for the application of this document. For da
17、ted references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. DIN 685-1, Round steel link chains, tested Part 1: Terms DIN 685-2, Round steel link chains, tested Part 2: Safety requirements DIN 685-3, Round s
18、teel link chains, tested Part 3: Test DIN 685-4:2001-02, Round steel link chains, tested Part 4: Marking, test certificate DIN 685-5, Round steel link chains, tested Part 5: Utilization DIN 17115, Steels for welded round link chains Technical delivery conditions 3 Terms and definitions For the purpo
19、ses of this document, the terms and definitions in DIN 685-1 and the following apply. 3.1 chain wheel drive wheel or idler wheel over which the chain runs according to the principle of positive fit. 3.1.1 tooth wheel chain wheel where the teeth dip into the flat-lying chain links, the force being tr
20、ansmitted centrally onto the outer crown of the vertical chain links 3.1.2 pocket wheel chain wheel where the flat-lying chain links dip into the pockets, the force being transmitted laterally onto the outer crown of these flat-lying links 3.2 chain roller drive roller or idler roller over which the
21、 chain runs according to the principle of friction fit. NOTE It is noted that flat-lying chain links may be subjected to bending stresses. DIN 764-1:2010-10 5 3.3 working force static force which the round steel link chain is designed to sustain in operation DIN 82056:2006-01 3.4 nominal size combin
22、ation of numerical values without units for designation and ordering purposes NOTE 1 It indicates nominal diameter and nominal pitch of the round steel link chain, e.g. 10 30. NOTE 2 It indicates the nominal diameter of the associated round steel link chain and the grade of forged components, e.g. 1
23、0-8. 3.5 fine tolerance chain round steel link chain round steel link chain where the tolerance on the pitch of the chain links is 2 % of the nominal pitch, and where information on the chain gauge length is also given, the tolerance on the gauge length being (25 %) of the pitch tolerance NOTE Meshi
24、ng of chain and chain wheel is ensured by the gauge length being given. 3.6 small tolerance chain round steel link chain round steel link chain where the tolerance on the pitch of the chain links is 2 %, but 5 % of the nominal pitch, and where information on the chain gauge length is also given, the
25、 tolerance on the gauge length being (25 %) of the pitch tolerance NOTE Meshing of chain with chain wheel and chain roller is ensured by the gauge length being given. 3.7 mass round steel link chain mass per unit length of the round steel link chain in kg/m NOTE As in DIN 1304-1:1994-03, Table 3, fo
26、r the mass per unit length m (mass per metre). 3.8 length difference e round steel link chain permissible difference in length between the shortest and the longest chain strand of a specified number of strands in a delivery 3.9 matching tolerance round steel link chain permissible difference in leng
27、th between two matched chain strands bundled together DIN 764-1:2010-10 6 Key e Length difference L Length of chain strand Figure 1 Permissible difference in length between two matched chain strands bundled together 4 Dimensions and designation 4.1 General Round steel link chains complying with this
28、 standard are supplied as type A chains for use with chain wheels (pocket wheels or tooth wheels) or as type B chains for use with chain rollers. 4.2 Dimensions Figure 2 Small tolerance round steel link chain The bases for calculation of the values for dimensions and masses given in Table 1 are give
29、n in the informative Annex A.DIN 764-1:2010-10 7 Table 1 Dimensions and masses Dimensions in millimetres 1 2 3 4 5 6 7 8 9 10 11 Nominal size Diameter Pitch Width Gauge lengthaMass internal external Tolerances d t d t b1b2l Type Tolerances Tolerances min. max. A B kg/m 10 35 10 0,4 35 +0,6 0,2 14 36
30、 385 +2 1 +3 1 2,1 13 45 13 0,5 45 +0,8 0,3 18 47 495 +3 1 +4 1 3,5 16 56 16 0,6 56 +1,0 0,3 22 58 616 +3 1 +5 2 5,3 18 63 18 0,9 63 +1,1 0,4 24 65 693 +4 1 +6 2 6,7 20 70 20 1,0 70 +1,3 0,4 27 72 770 +4 1 +6 2 8,3 23 80 23 1,2 80 +1,4 0,5 31 83 880 +5 2 +7 2 11,0 26 91 26 1,3 91 +1,6 0,5 35 94 1 00
31、1 +5 2 +8 3 14,0 30 105 30 1,5 105 +1,9 0,6 39 108 1 155 +6 2 +9 3 18,5 33 115 33 1,7 115 +2,1 0,7 43 119 1 265 +7 2 +10 3 22,5 36 126 36 1,8 126 +2,3 0,8 47 130 1 386 +7 2 +11 4 27,0 39 136 39 2,0 136 +2,4 0,8 51 140 1 496 +8 3 +12 4 31,5 42 147 42 2,1 147 +2,6 0,9 55 151 1 617 +9 3 +13 4 36,5 aPer
32、fect meshing of chain and chain wheel can be ensured if the chain wheel is made available to the chain manufacturer. 4.3 Designation Designation of a round steel link chain of grade 3 and type A, with a nominal size of 20 70: Chain DIN 764 3 A 20 70 Designation to be used when ordering: Example of a
33、n order for 100 m of round steel link chain of grade 3 and type A, with a nominal size of 20 70: 100 m of chain DIN 764 3 A 20 70 Example of an order for 200 chain strands of a round steel link chain of grade 3 and type A, with a nominal size of 20 70, each with n = 7 links: 200 chain strands DIN 76
34、4 3 A 20 70 7 DIN 764-1:2010-10 8 5 Material The steel used shall be fully killed, fine grained, and be stabilized against strain age embrittlement according to DIN 17115, at least steel grade 15 Mn 3 Al. NOTE For nominal diameters 23 mm, at least steel grade 21 Mn 4 Al, material number 1.0470 accor
35、ding to DIN 17115 is recommended. 6 Surface condition Standard surface finish: natural black. 7 Safety requirements 7.1 Dimensions The dimensions of the chain links shall be within the tolerances specified in Table 1. The weld diameter ds shall be no more than 3 % lower than the actual diameter and
36、not exceed the nominal diameter d by more than 8 %. The welds shall be positioned in the middle of the chain legs, and the length affected by welding a shall not exceed the nominal diameter d. 7.2 Length of chain strand 7.2.1 General Within a delivery chain strands complying with this standard are s
37、ubdivided for use in both double-strand and multiple-strand conveyors into category 1 “with strand length tolerance” and category 2 “with matching tolerance” and determined by the length difference e shown in Figure 1. 7.2.2 Category 1 For chain strands of type A with strand length tolerance, the ac
38、tual strand lengths shall be within the strand length tolerance of 0,4 %. NOTE For a strand length of 10 000 mm, for example, the maximum length difference e is 40 mm. For chain strands of type B with strand length tolerance, the actual strand lengths shall be within the strand length tolerance of 1
39、 %. NOTE For a strand length of 10 000 mm, for example, the maximum length difference e is 100 mm. 7.2.3 Category 2 For chain strands of type A with matching tolerance, which are supplied bundled in pairs, the actual strand lengths shall be within the strand length tolerance of 0,08 % for the bundle
40、. NOTE 1 For a strand length of 10 000 mm, for example, the maximum length difference e is 8 mm. NOTE 2 During assembly care should be taken to ensure that bundled strands are installed parallel to one another. In order to avoid interchanging of the chain strands, bundles should only be opened durin
41、g the course of assembly. For chain strands of type B with matching tolerance, which are supplied bundled in pairs, the actual strand lengths shall be within the strand length tolerance of 0,2 % for the bundle. NOTE 3 For a strand length of 10 000 mm, for example, the maximum length difference e is
42、20 mm. DIN 764-1:2010-10 9 NOTE 4 During assembly care shall be taken to ensure that bundled strands are installed parallel to one another. In order to avoid interchanging of the chain strands, bundles shall only be opened during the course of assembly. 7.3 Heat treatment The chains shall be heat tr
43、eated and meet the requirements specified in DIN 685-2. 7.4 Mechanical properties The manufacturing proof force, breaking force and bend deflection of chains shall be as specified in Table 2, the total ultimate elongation being not less than 20 %. The bases for calculation of the values for working
44、force and mechanical properties given in Table 2 are given in the informative Annex A. Table 2 Working force and mechanical properties 1 2 3 4 5 Nominal size Working force Manufacturing proof force Breaking force Bend deflection d t kN kN kN mm max. min. min. min. 10 35 12,5 36 50 10 13 45 20 56 80
45、13 16 56 32 90 125 16 18 63 40 110 160 18 20 70 50 140 200 20 23 80 63 180 250 23 26 91 80 220 320 26 30 105 110 320 450 30 33 115 125 360 500 33 36 126 160 450 630 36 39 136 180 500 710 39 42 147 220 630 900 42 8 Manufacturing proof test For the manufacturing proof test, the specifications of DIN 6
46、85-3 shall apply. DIN 764-1:2010-10 10 9 Final test The final test shall cover a dimensional check as well as the tensile test and the bend test in accordance with DIN 685-3. The values for breaking force and total ultimate elongation shall only apply to round steel link chains with a “natural black
47、” surface condition. Although round steel link chains with a corrosion protection coating and those with a “bright polished” surface have the same material tensile strength, the values for the breaking force and the total ultimate elongation are reduced during the tensile test due to the changes in
48、wear behaviour at the crown of the chain links. Thus, the values for the breaking force and the total ultimate elongation shall be deemed to have been reached if the breaking force is at least 90 % and the total ultimate elongation at least 70 % of the breaking force and the total ultimate elongatio
49、n respectively of a natural black chain of the same nominal size. When checking the length of chain strands, care shall be taken to ensure that each chain strand is without twist and subjected to a force at least equal to 20 % of the working force. Alternatively, they can be suspended. Any other tests are to be agreed when ordering. 10 Acceptance
