1、June 2015DEUTSCHE NORM English price group 11No 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 sale for German Standards (DIN-Normen).ICS 53.040.20!%E which com
2、ply with this standard fulfil the relevant health and safety requirements and thus conform to the acknowledged rules of technology. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. DIN shall not be held responsible for identifying
3、any or all such patent rights. Annex A is informative. This document has been prepared in close cooperation with the Timber and Metal Department of the Deutsche Gesetzliche Unfallversicherung (DGUV) (German Social Accident Insurance), Section Hebetechnik und Instandhaltung (Lifting Technology and Ma
4、intenance). It specifies safety requirements based on the ratios of mean stress at working force to mean stress at manufacturing proof force and and to mean stress at breaking force, and also on the manufacturing proof test to be carried out for each chain. Amendments This standard differs from DIN
5、766:1986-01 as follows: a) the title of the standard has been changed; b) Clause “Introduction” has been added; c) the standard has been revised in form and substance; d) in the German original the term “Nenngre” has been introduced in accordance with DIN 685-100 (= d x t) (in the English translatio
6、n, the term “nominal size” has been changed accordingly in its meaning in the table headings and in the designations); e) in the German original the term “lehrenhaltig” has been changed to “eng toleriert” in accordance with DIN 685-100 (the English translation of this term, “calibrated”, has been ch
7、anged accordingly to “close tolerance”); f) in the German version, the term “Dicke” has been changed to “Durchmesser” (the English translation of this term has been changed accordingly to “diameter” in the table headings); DIN 766:2015-06 4 g) in the German version, the term “Betriebskraft” has been
8、 added (in the English translation, this term is referred to as “working force”); h) in the German original the term “Gewicht” has been changed to “Masse/Meter” in accordance with DIN 685-100 (“mass/metre” in English); i) the values of mass/metre have been updated; j) nominal diameter 32 has been ch
9、anged to 33 and diameter 40 to 39; k) the values of width have been changed; l) the tolerances on pitch and gauge length have been changed; m) the values for the manufacturing proof force have been increased in line with other chain standards; n) an informative Annex A “Bases of calculation” has bee
10、n included; o) the material specifications have been brought in line with the revised version of DIN 17115; p) the structure of the standard has been harmonized with European chain standards; q) hand chains are no longer included; they will be dealt with in DIN 32898; r) in accordance with the speci
11、fications of DIN EN 13157, hoist chains are no longer covered by this standard. Previous editions DIN 672: 1924-04 DIN 696: 1943-08, DIN 766: 1932-09, 1937-03, 1940x-02, 1942-11, 1948-04, 1954-07, 1986-01 DIN 766:2015-06 5 Introduction DIN 766:1954-07 covered a variety of different chain types, such
12、 as tested, calibrated and tested, non-calibrated round steel link chains of grades 2 and 3 as well as chains which had not been tested. This had repeatedly led to confusion in the past. Therefore, further work on this topic was aimed at developing standards for the individual chain types. A first s
13、tep was taken in 1980, when medium tolerance (non-calibrated) round steel link chains of grade 2 (formerly referred to as standard grade) were included in DIN 32891 after conversion to a ratio of nominal diameter to nominal pitch of 1:3. As a result, since 1986 chains as specified in DIN 32891 have
14、had to be used for chain slings conforming to DIN 695. Upon revision of DIN 766:1954-07 in 1986, the scope was limited to close tolerance (calibrated) round steel link chains of grade 3 (formerly designated “quenched and tempered”) which, in all sectors of industry, are preferably used as load chain
15、s, as hand chains in hand powered lifting equipment, and as long-link chains in chain conveyors and bucket elevators. For this reason, the values of pitch and width were not changed. Since then, close tolerance (calibrated), round steel link chains of grade 2 (formerly referred to as standard grade)
16、 have no longer been dealt with in DIN 766. They were included in other chain standards at a later date (see below). The next step towards separation was taken in 1990 with the publicaton of draft Standards E DIN 766-1 to -3. Part 3 included tested, close tolerance (calibrated) round steel link chai
17、ns of grade 2 (formerly referred to as standard grade), with specific requirements for case hardening and with tolerances on length for matched chain strands, intended for use in bucket elevators. In 2001, these chains were incorporated in DIN 5698-1. E DIN 766-1 included rough tolerance round steel
18、 link chains, not tested, mainly used for subordinate purposes, such as barriers, or to hold and secure parts. In 2003, these chains were incorporated in DIN 5685-3. E DIN 766-2 included tested, close tolerance (calibrated) round steel link chains of grade 2 (formerly referred to as standard grade).
19、 This part then formed the basis for preparing European standards on studless anchor chains for use in inland navigation, since the mechanical properties of grade 2 chains were in compliance with the regulations of the Germanischer Lloyd for quality grade GL-K1. The addition of further quality grade
20、s (GL-K2 and GL-K3) then led to the publication of DIN EN 14330 in 2004, and chains for hoisting equipment as in DIN 766:1986-01 have been dropped without replacement. Based on the specifications of DIN EN 13157, hand powered lifting equipment is now to be used with hoist chains of quality class T (
21、type T) as in DIN EN 818-7, made of high-grade steels in accordance with DIN 17115. For power driven hoists as specified in DIN EN 14492 Parts 1 and 2, hoist chains of quality class T (types T, DAT and DT) as in DIN EN 818-7, made of high-grade steels in accordance with DIN 17115 are to be used. Han
22、d chains for hand powered lifting equipment have been dropped and are now included in DIN 32898. Thus, the present standard and any future revision only apply to tested, close tolerance round steel link chains of grade 3 for chain conveyors and bucket elevators. An overview of the history of DIN 766
23、 as described above is given in Table 1. DIN 766:2015-06 6 Table 1 Overview Included in DIN 766:1954-07 Then specified in: Tested, calibrated round steel link chain, standard grade (studless anchor chain) First: E DIN 766-2:1990-09 Then: DIN EN 14330:2004-02 Tested, calibrated round steel link chain
24、, standard grade (case hardened chain strands) First: E DIN 766-3:1990-09 Then: DIN 5698-1:2001-10 Tested, calibrated round steel link chain, quenched and tempered (hoist chain) First: DIN 766:1986-01 Then: dropped without replacement Tested, calibrated round steel link chain, quenched and tempered
25、(for chain conveyors) First: DIN 766:1986-01 Then: DIN 766 (at present under preparation) Tested, calibrated round steel link chain, quenched and tempered (hand chains) First: DIN 766:1986-01 Then: DIN 32898 (at present under preparation) Tested, non-calibrated round steel link chain, standard grade
26、 (chain sling) DIN 32891:1980-06 Round steel link chains, not tested (non-proof loaded chain) First: E DIN 766-1:1990-09 Then: DIN 5685-3: 2003-07 DIN 766:2015-06 7 1 Scope This document applies to tested, close tolerance round steel short-link chains of grade 3, with a nominal pitch t = 2,8 d and w
27、ith nominal diameters d from 10 mm to 42 mm, for use at service temperatures from -20 C up to +400 C. It specifies dimensions and mechanical properties (see Annex A). Round steel link chains according to this standard are mainly used as long link chains in chain conveyors and in bucket elevators, as
28、 defined in DIN 15201-1. To avoid confusion with round steel links chains of other grades, it shall be ensured before use that the chains bear the required test stamp (see Clause 8) (further information on the use is given in Clause 10). WARNING Round steel link chains as specified here shall not be
29、 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 10). 2 Normative references The following documents, in whole or in part, are normatively referenc
30、ed in this document and are indispensable for its application. 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 ste
31、el link chains, tested Part 2: Safety requirements DIN 685-3, Round steel link chains, tested Part 3: Test DIN 685-4, Round steel link chains Part 4: Marking, test certificate DIN 685-5, Round steel link chains, tested Part 5: Utilization DIN 685-100, Round steel link chains, tested Part 100: Additi
32、onal terms DIN 17115, Steels for welded round link chains and chain components Technical delivery conditions VDI 3970, Recommendations for the preparation of a maintenance schedule of conveyors 3 Terms and definitions For the purposes of this document, the terms and definitions given in DIN 685-1 an
33、d DIN 685-100 apply. 4 Dimensions, designation 4.1 General Chain strands complying with this standard are supplied with tolerance class A for use with chain wheels (pocket wheels) or with tolerance class B for use with chain rollers. DIN 766:2015-06 8 4.2 Dimensions The bases for calculation of the
34、values for dimensions and masses given in Table 2 are explained in the informative Annex A. Figure 1 Close tolerance round steel link chain Table 2 Dimensions and masses Dimensions in millimetres 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Nominal size Diameter Pitch Width Gauge lengthbMass/ metre internal ext
35、ernal d null t d t b1a b2l Tolerances Tolerances Tolerances min. max. Tolerance class kg/m A B 10 null 28 10 0,4 28 +0,5 0,3 14,0 36 308 +2 1 +2 1 2,3 13 null 36 13 0,5 36 +0,6 0,3 18,0 47 396 +2 1 +3 2 3,9 16 null 45 16 0,6 45 +0,8 0,4 22,5 58 495 +3 1 +4 2 5,9 18 null 50 18 0,9 50 +0,9 0,5 25,0 65
36、 550 +3 1 +4 2 7,5 20 null 56 20 1,0 56 +1,0 0,5 28,0 72 616 +3 2 +5 2 9,2 23 null 64 23 1,2 64 +1,2 0,6 32,0 83 704 +4 2 +6 3 12,0 26 null 73 26 1,3 73 +1,3 0,7 34,0 94 803 +4 2 +6 3 15,5 30 null 84 30 1,5 84 +1,5 0,8 39,0 108 924 +5 2 +7 4 20,5 33 null 92 33 1,7 92 +1,7 0,8 43,0 119 1 012 +5 3 +8
37、4 25,0 36 null 101 36 1,8 101 +1,8 0,9 47,0 130 1 111 +6 3 +9 4 29,5 39 null 109 39 2,0 109 +2,0 1,0 50,5 140 1 199 +6 3 +10 5 35,0 42 null 118 42 2,1 118 +2,1 1,1 54,5 151 1 298 +7 4 +10 5 40,5 aThe last chain link of the chain strand shall not be widened through the connecting element in that link
38、. There should be a clearance between the internal width b1 and the connecting element equal to at least 10 % of the internal width. bPerfect meshing of chain and chain wheel can be ensured if the chain wheel is made available to the chain manufacturer. DIN 766:2015-06 9 4.3 Designation Designation
39、of a round steel link chain of grade 3, with a nominal size of 20 56: Chain DIN 766 3 20 56 Designation to be used when ordering: Example of an order for 100 m of round steel link chain of grade 3, with a nominal size of 20 56: 100 m of chain DIN 766 3 20 56 Example of an order for 200 chain strands
40、 of a round steel link chain of grade 3, with a nominal size of 20 56, each with n = 7 links,: 200 chain strands DIN 766 3 20 56 7 5 Requirements 5.1 Material The steel used shall be fully killed, fine grained, and be stabilized against strain age embrittlement according to DIN 17115, at least steel
41、 grade 15Mn4, material number 1.0468. For nominal diameters 20 mm, at least steel grade 18Mn4, material number 1.0469 according to DIN 17115 is recommended. 5.2 Heat treatment Round steel link chains shall be heat treated and meet the requirements specified in DIN 685-2. 5.3 Dimensions The dimension
42、s of round steel link chains shall be within the tolerances specified in Table 2. 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 legs of the chain link, the lengt
43、h affected by welding a shall not exceed the nominal diameter d. 5.4 Length of chain strand 5.4.1 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 catego
44、ry 2 “with matching tolerance” and determined by the length difference e in accordance with DIN 685-100, 3.13 and 3.14. DIN 766:2015-06 10 5.4.2 Category 1 For long chain strands with strand length tolerance, of tolerance class A, with a strand length of more than 1 000 mm, the maximum length differ
45、ence e for strand lengths up to 8 000 mm shall be 32 mm. For larger strand lengths, the actual strand lengths shall be within the strand length tolerance of 0,4 %. NOTE 1 For a strand length of 10 000 mm, for example, the maximum length difference e shall be 40 mm. For strand lengths less than 1 000
46、 mm, the length difference e shall be as specified in DIN 5698-1 for tolerance class A in category 1. For chain strands with strand length tolerance of tolerance class B, with strand lengths exceeding 1 000 mm, the maximum length difference e for strand lengths up to 8 000 mm shall be 80 mm. For lar
47、ger strand lengths, the actual strand lengths shall be within the 1 % strand length tolerance. NOTE 2 For a strand length of 10 000 mm, for example, the maximum length difference e shall be 100 mm. For strand lengths less than 1 000 mm, the length difference e shall be as specified in DIN 5698-1 for
48、 tolerance class B in category 1. 5.4.3 Category 2 For long chain strands with matching tolerance, of tolerance class A, and with a strand length of more than 1 000 mm, which are supplied bundled in pairs, the maximum length difference e for strand lengths up to 8 000 mm shall be 6,4 mm. For larger
49、strand lengths, 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. For strand lengths less than 1 000 mm, the length difference e shall be as specified in DIN 5698-1 for tolerance class A in category 2. During assembly care should be taken to ensure that the bundled strands are installed parallel to one another. In order to
