1、June 2015DEUTSCHE NORM English price group 9No 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 comp
2、ly 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 a
3、ny 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 Mai
4、ntenance). It specifies safety requirements based 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. DIN 762 Round steel link chains Round steel lin
5、k chains, pitch 5d, for chain conveyors consists of the following parts: Part 1: Grade 3, quenched and tempered Part 2: Grade 5, quenched and tempered Part 3: Grade 7 (at present under preparation) Amendments This standard differs from DIN 762-1:1992-09 as follows: a) the title of the standard has b
6、een changed; ) Translators note. The German original is incorrect. It should read “1992-09”. DIN 762-1:2015-06 4 b) the standard has been revised in form and substance; c) case hardened round steel link chains of grade 2 have been included in DIN 5694-1; d) round steel link chains of grade 2 that ha
7、ve not been case hardened have been replaced by round steel link chains of grade 3; e) in the German original the term “Nenngre” has been introduced in accordance with DIN 685-100 (= d t); (in the English translation the term “nominal size” has been changed accordingly in its meaning in the table he
8、adings and in the designations); f) in the German original the term “lehrenhaltig” has been changed to “eng toleriert” in accordance with DIN 685-100 (in the English translation of this term, “calibrated”, has been changed accordingly to “close tolerance”); g) in the German original the term “Gewich
9、t” has been changed to “Masse/Meter” in accordance with DIN 685-100 (“mass/metre” in English); h) the values of mass/metre have been updated; i) in the German original the term “Zugkraft” has been changed to “Betriebskraft” (the English translation of this term, “tensile force”, has been changed acc
10、ordingly to “working force”); j) in the German original the term “Dicke” has been changed to “Durchmesser” (the English translation of this term has been changed accordingly to “diameter” in the table headings); k) nominal size 23 115 has been included; l) the tolerances on pitch and gauge length ha
11、ve 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 been included; o) the material specifications have been brought into line with the revised version of DIN 17115; p) the struct
12、ure of the standard has been harmonized with European chain standards. Previous editions DIN 762: 1943-06, 1955-03, 1971-01 DIN 762-1: 1982-01, 1992-09 DIN 762-1:2015-06 5 1 Scope This document applies to tested, close tolerance round steel long-link chains of grade 3, with a nominal pitch t = 5 d a
13、nd with nominal diameters d from 10 mm to 23 mm, for use at service temperatures of 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, a
14、s defined in DIN 15201-1. To avoid confusion with round steel link 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 of round steel link chains is given in Clause 10). WARNING Round steel link chains as
15、specified 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 link chains is given in Clause 10). 2 Normative references The following documents, in whole or i
16、n part, are normatively referenced 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 Pa
17、rt 1: Terms DIN 685-2, Round steel 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, tested Part 4: Marking, test certificate DIN 685-5, Round steel link chains, tested Part 5: Utilization DIN 685-100, Round st
18、eel link chains, tested Part 100: Additional terms DIN 17115, Steels for welded round link chains and chain components Technical delivery conditions VDI 3970, Recommendation for the preparations of a maintenance schedule of conveyors 3 Terms and definitions For the purposes of this document, the ter
19、ms and definitions given in DIN 685-1 and DIN 685-100 apply. 4 Dimensions and designation 4.1 Dimensions The bases for calculation of the values for dimensions and masses given in Table 1 are explained in the informative Annex A. DIN 762-1:2015-06 6 Figure 1 Close tolerance round steel link chain Ta
20、ble 1 Dimensions and masses Dimensions in millimetres 1 2 3 4 5 6 7 8 9 10 11 12 Nominal size Diameter Pitch Width Gauge length bMass/ Metre internal external d t d t b1ab2l Tolerances Tolerances min. max. Tolerances kg/m 10 50 10 0,4 50 +0,9 0,5 14,0 36 550 +3 1 1,8 13 65 13 0,5 65 +1,2 0,6 18,0 47
21、 715 +4 2 3,1 16 80 16 0,6 80 +1,4 0,7 22,5 58 880 +5 2 4,7 18 90 18 0,9 90 +1,6 0,8 25,0 65 990 +5 3 5,9 20 100 20 1,0 100 +1,8 0,9 28,0 72 1100 +6 3 7,3 23 115 23 1,2 115 +2,1 1,0 32,0 83 1265 +7 3 9,7 aThe last chain link of the chain strand shall not be widened through the connecting element in
22、that link. There should be a clearance between the internal width b1and 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. 4.2 Designation Designation of a round
23、 steel link chain of grade 3, with a nominal size of 16 80: Chain DIN 762 3 16 80 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 16 80: 100 m of chain DIN 762 3 16 80 Example of an order for 200 chain strands of a roun
24、d steel link chain of grade 3, with a nominal size of 16 80, each with n = 7 links: 200 chain strands DIN 762 3 16 80 7 DIN 762-1:2015-06 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 le
25、ast steel 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
26、dimensions of round steel link chains 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 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,
27、the length affected by welding a shall not exceed the nominal diameter. 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
28、 category 2 “with matching tolerance” and determined by the length difference e in accordance with DIN 685-100, 3.13 and 3.14. 5.4.2 Category 1 For long chain strands with strand length tolerance, with a strand length of more than 1 000 mm, the maximum length difference e for strand lengths up to 8
29、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 For a strand length of 10 000 mm, for example, the maximum length difference e is 40 mm. For strand lengths less than 1 000 mm, the length difference e shall be as s
30、pecified in DIN 5698-1 for tolerance class A in category 1. 5.4.3 Category 2 For long chain strands with matching tolerance 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 larg
31、er strand lengths, the actual strand lengths shall be within the strand length tolerance of 0,08 % for the bundle. NOTE For a strand length of 10 000 mm, for example, the maximum length difference e is 8 mm. During assembly care should be taken to ensure that the bundled strands are installed parall
32、el to one another. In order to avoid interchanging of the chain strands, bundles should only be opened during the course of assembly. DIN 762-1:2015-06 8 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. 5.5 Workin
33、g forces The maximum values for the working forces generally used in practice are given in Table 2. Table 2 Working forces Nominal size Working forces d t WFv WFh vertical horizontal kN kN 10 50 10 12,5 13 65 16 20 16 80 25 32 18 90 32 40 20 100 40 50 23 115 50 63 5.6 Mechanical properties The manuf
34、acturing proof force, breaking force and bend deflection of round steel link chains shall be as specified in Table 3, the total ultimate elongation being not less than 15 %. Table 3 Mechanical properties 1 2 3 4 Nominal size d t Manufacturing proof force MPF Breaking force BF Bend deflection f kN kN
35、 mm min. min. min. 10 50 36 50 13 13 65 56 80 17 16 80 90 125 21 18 90 110 160 23 20 100 140 200 26 23 115 180 250 30 DIN 762-1:2015-06 9 6 Tests 6.1 Material Proof of compliance of the material used with the specified requirements shall be provided in accordance with DIN 685-3. 6.2 Manufacturing pr
36、oof test For the manufacturing proof test, the specifications of DIN 685-3 shall apply. 6.3 Final test The final test shall cover a dimensional check, the tensile test and bend test in accordance with DIN 685-3. For the tensile test, three-link samples shall be used. The values for the breaking forc
37、e and the 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 protected” surface condition and those with a “bright polished” surface condition have the same material tensile strength, the
38、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 if the breaking for
39、ce 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
40、 and subjected to a force at least equal to 20 % of the working force. Alternatively, the chain strands may be suspended. Any other tests are to be agreed when ordering. 6.4 Acceptance test For the acceptance test, if agreed, the specifications of DIN 685-3 shall apply. 7 Surface condition The stand
41、ard surface condition shall be natural black. Any other surface conditions are to be agreed when ordering. 8 Marking Marking shall be as specified in DIN 685-4. In addition, the chains shall be marked with the number “3” to denote grade 3. Each chain strand shall be provided with at least one markin
42、g. 9 Test certificate The final test of the round steel link chain shall be confirmed by a test certificate as specified in DIN 685-4. DIN 762-1:2015-06 10 10 Use Handling, inspection and maintenance of round steel link chains shall comply with the specifications of DIN 685-5 and VDI 3970. Additiona
43、lly, it is to be noted that the enlargement of the pitch per chain link due to interlink-wear shall not exceed 4 % of the nominal pitch t, and the enlargement of the gauge length due to interlink-wear shall not exceed 2 % of the nominal gauge length l of the straight chain. 11 Environmental aspects
44、As a rule, round steel link chains complying with this document are highly durable without loss of quality in the course of their service life. Due to the material used round steel link chains are 100 % recyclable at the end of their life cycle (removal from service), as they can be melted down comp
45、letely to produce new materials. The steel obtained from recycling offers the same quality characteristics as steel made from pure iron ore (virgin material). In addition, the quality of recycled steel can be adapted to various new requirements, e.g. by alloying. DIN 762-1:2015-06 11 Annex A (inform
46、ative) Bases of calculation A.1 General The values given in Table 1 have been calculated on the basis of the principles set out in Table A.1. A detailed explanation is given in A.2. Symbols are represented in Figure A.1. Figure A.1 Dimensions of chain link Table A.1 Calculation principles Dimensions
47、 Calculation principles Nominal diameter d from 10 mm to 23 mm External width b2 max3,6 d Internal width b1 min1,4 d Welded chain leg ds max1,08 d Unwelded chain leg d 1 d Width tolerance Bt0,12 d Clearance smin0,32 d Length affected by welding amax1 d Nominal pitch t 5 d Bend deflection f 1,3 d DIN
48、 762-1:2015-06 12 A.2 Re Table 1 Dimensions and masses A.2.1 Nominal diameter The tolerances for nominal diameters d 16 mm are based on a 4 % tolerance and those for nominal diameters d 18 mm on a 5 % tolerance of nominal diameter d. The calculated values are rounded to 0,1 mm. These values are give
49、n in Table 1, column 3. A.2.2 Pitch The nominal pitch shall be t = 5 d. The calculated values are rounded to 1 mm. The tolerance, in percent, is based on the formula 2,08+ 0,62 Thus, for one pitch (n = 1) there is a resulting tolerance of 2,7 % of the nominal pitch t. This is divided into + 1,8 % (+2/3) and 0,9 % (1/3). The calculated values are rounded to 0,1 mm. A.2.3 Internal width The inte
