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+“2274708www.din.deDDIN 764-2Round steel link chains Round steel link chains for chain conveyors Part 2: Grade 5,English translation of DIN 764-2:2010-10Rundstahlketten Rundstahlketten fr Kettenfrderer Teil 2: Gteklasse 5,Englische bersetzung von D
3、IN 764-2:2010-10Chanes en acier de section ronde Chanes en acier de section ronde pour conveyeurs chane Partie 2: Classe 5,Traduction anglaise de DIN 764-2:2010-10SupersedesDIN 764-2:1992-09See start of applicationwww.beuth.deDocument comprises 15 pages11.15DIN 764-2:2010-10 2 A comma is used as the
4、 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 Manufacturing proof te
5、st 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 764-2:2010-10 3 Foreword This document has been prepared by Working Committee NA 085-
6、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 within th
7、e 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 Unfallversicherun
8、g (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 based on the
9、 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 Produktsicherheits
10、gesetz (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 under prepara
11、tion) Amendments This standard differs from DIN 764-2:1992-09 as follows: a) grade 3 has been replaced by grade 5; b) nominal size 28 98 has been dropped; c) the division of tolerances on pitch and gauge length has been changed (see Annex A); d) the title of the standard has been changed; e) in the
12、German original the term “Zugkraft” has been changed to “Betriebskraft” (the English translation of this term, “tensile force” has been changed accordingly to “working force”); f) in the German original the term “lehrenhaltig” has been changed to “eng toleriert” (the English translation of this term
13、 “calibrated” has been changed accordingly to “small tolerance”); g) 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 764-2: 1982-01, 1992-09 DIN 764-2:2010-10 4 1 Scope This standard specifies dimensions
14、and mechanical properties of tested, small tolerance round steel link chains of grade 5, 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 s
15、pecified here shall not be used as lifting accessories, 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 indis
16、pensable for the application of this document. For dated 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,
17、tested Part 2: Safety requirements DIN 685-3, Round steel 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 deli
18、very conditions 3 Terms and definitions For the purposes 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. DIN 764-1 3.1.1 tooth wheel chain wheel where th
19、e teeth dip into the flat-lying chain links, the force being transmitted centrally onto the outer crown of the vertical chain links DIN 764-1 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
20、-lying links DIN 764-1 DIN 764-2:2010-10 5 3.2 chain roller drive roller or idler roller over which the 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 3.3 working force static force which the round s
21、teel link chain is designed to sustain in operation DIN 82056:2006-01 3.4 nominal size combination 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
22、 diameter of the associated round steel link chain and the grade of forged components, e.g. 10-8. DIN 764-1 3.5 fine tolerance chain round steel link chain round steel link chain where the tolerance on the pitch of chain links is 2 % of the nominal pitch, and where information on the chain gauge len
23、gth is also given, the tolerance on the gauge length being (25 %) of the pitch tolerance NOTE Meshing of chain and chain wheel is ensured by the gauge length being given. DIN 764-1 3.6 small tolerance chain round steel link chain round steel link chain where the tolerance on the pitch of chain links
24、 is 2 %, but 5 % 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 Meshing of chain and chain wheel is ensured by the gauge length being given. DIN 764-1 3.7 mass round steel link chain mass
25、 per unit length of the round steel link chain in kg/m NOTE As in DIN 1304-1:1994-03, Table 3, for the mass per unit length m (mass per metre). DIN 764-1 DIN 764-2:2010-10 6 3.8 length difference e round steel link chain permissible difference in length between the shortest and the longest chain str
26、and of a specified number of strands in a delivery DIN 764-1 3.9 matching tolerance round steel link chain permissible difference in length between two matched chain strands bundled together Key e Length difference L Length of chain strand Figure 1 Permissible difference in length between two matche
27、d chain strands bundled together DIN 764-1 4 Dimensions and designation 4.1 General Round steel link chains complying with this 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 Sma
28、ll tolerance round steel link chain DIN 764-2:2010-10 7 The bases of calculation of the values for the dimensions and masses given in Table 1 are given in the informative Annex A. 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
29、lengthaMass internal external Tolerances d t d t b1 b2 l Type Tolerances Tolerances min. max. A B kg/m 10 35 10 0,4 35 +0,6 0,2 14 36 385 +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 2
30、0 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 1 001 +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
31、 +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 aPerfect 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
32、chain of grade 5 and type A, with a nominal size of 20 70: Chain DIN 764 5 A 20 70 Designation to be used when ordering Example of an order for 100 m of round steel link chain of grade 5 and type A, with a nominal size of 20 70: 100 m of chain DIN 764 5 A 20 70 Example of an order for 200 chain stra
33、nds of a round steel link chain of grade 5 and type A, with a nominal size of 20 70, each with n = 7 links: 200 chain strands DIN 764 5 A 20 70 7 DIN 764-2:2010-10 8 5 Material The steel used shall be fully killed, fine grained, and be stabilized against strain age embrittlement according to DIN 171
34、15, at least steel grade 21 Mn 4 Al. NOTE For nominal diameters 23 mm, at least steel grade 27 Mn Si 5, material number 1.0412 accordingto DIN 17115 is recommended. 6 Surface condition Standard surface finish: natural black. 7 Safety requirements 7.1 Dimensions The dimensions of the chain links shal
35、l be within the tolerances specified in Table 1. The weld diameter ds shall be no more than 3 % lower than the actual diameter and 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
36、the nominal diameter d. 7.2 Length of chain strand 7.2.1 General Within a delivery chain strands complying with this standard are subdivided for use in both double-strand and multiple-strand conveyors into category 1 “with strand length tolerance” and category 2 “with matching tolerance” and determi
37、ned 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 actual 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. F
38、or chain strands of type B with strand length tolerance, the actual strand lengths shall be within the strand length tolerance of 1 %. 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,
39、 which are supplied bundled in pairs, the actual strand lengths shall be within the strand length tolerance of 0,08 % for the bundle. 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 stra
40、nds are installed parallel to one another. In order to avoid interchanging of the chain strands, bundles should only be opened during the course of assembly. DIN 764-2:2010-10 9 For chain strands of type B with matching tolerance, which are supplied bundled in pairs, the actual strand lengths shall
41、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 20 mm. NOTE 4 During assembly care should be taken to ensure that bundled strands are installed parallel to one another. In order to avoid interchan
42、ging of the chain strands, bundles should only be opened during the course of assembly. 7.3 Heat treatment The chains shall be heat treated 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
43、 as specified in Table 2, the total ultimate elongation being not less than 15 %. The bases for calculation of the values for working 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
44、force Manufacturing proof force Breaking force Bend deflection d t kN kN kN mm max. min. min. min. 10 35 20 56 80 10 13 45 32 90 125 13 16 56 50 140 200 16 18 63 63 180 250 18 20 70 80 220 320 20 23 80 100 280 400 23 26 91 125 360 500 26 30 105 180 500 710 30 33 115 200 560 800 33 36 126 250 710 100
45、0 36 39 136 280 800 1100 39 42 147 360 1000 1400 42 8 Manufacturing proof test For the manufacturing proof test, the specifications of DIN 685-3 shall apply. DIN 764-2:2010-10 10 9 Final test The final test shall cover a dimensional check as well as the tensile test and the bend test in accordance w
46、ith DIN 685-3. The values for breaking force and total ultimate elongation shall only apply to round steel link chains with a “natural black” surface condition. Although round steel link chains with a corrosion protection coating and those with a “bright polished” surface have the same material tens
47、ile strength, the values for the breaking force and the total ultimate elongation are reduced during the tensile test due to the changes in 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 i
48、f the breaking force is at least 90 % and the total ultimate elongation at least 70 % of the breaking force and the total ultimate elongation 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 test For the acceptance test, if agreed, the specifications of DIN 685-3 shall apply. 11 Marking Marking shal
