1、May 2012DEUTSCHE NORM English price group 12No 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!%F lower forc
2、e, upper force . 19 B.4 Table 5 Gauge length and measuring force. 19 Annex C (informative) Information on the dimensional interaction of a flat link chain and a flat type connector 20 Bibliography . 22 DIN 22255:2012-05 3 Foreword This standard includes (in Clauses 4 and 5) safety requirements withi
3、n the meaning of the Produkt-sicherheitsgesetz (ProdSG) (German Product Safety Act). This standard has been prepared by Working Committee NA 008-05-05 AA Einzelteile fr Frderer of Normenausschuss Bergbau (Mining Standards Committee FABERG) in cooperation with Normenausschuss Rundstahlketten (Round S
4、teel Link Chains Standards Committee NRK). 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 any or all such patent rights. This standard supersedes DIN 22255:2001-08. The inspection
5、 certificate in Annex A, the bases for calculation in Annex B and the information in Annex C are informative. Amendments This standard differs from DIN 22255:2001-08 as follows: a) nominal size 48 152 has been newly included; b) a hardness test has been newly included; c) the conversion of hardness
6、has been corrected; d) Annex C has been extended; e) the standard has been editorially revised. Previous versions DIN 22255: 2001-08 DIN 22255:2012-05 4 1 Scope This standard applies to flat link chains with the same pitch (round steel link chains with flattened vertical links which may be either fo
7、rged or welded) subjected to traction in chain conveyors preferably in mining operations. They are used whenever the profiles of the conveyors do not permit the use of the round steel link chain according to DIN 22252 of the same nominal size. This standard specifies requirements for the design, sel
8、ection of materials, test procedures and working forces. Flat link chains according to this standard shall not be used as lifting accessories, slings or loadbearing devices within the meaning of DIN 15003. 2 Normative references The following documents, in whole or in part, are normatively reference
9、d 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 15003, Lifting appliances Load suspension devices, loads and forces Defini
10、tions DIN 17115, Steels for welded round steel chains Technical delivery conditions DIN 22252, Round steel chains for continuous conveyors and winning equipment in mining operations DIN 50100, Testing of materials Fatigue test Definitions, symbols, procedure, evaluation DIN 51220, Material testing m
11、achines General requirements for material testing machines and their testing and calibration DIN EN 10204, Metallic materials Types of test certificates DIN EN ISO 148-1, Metallic materials Charpy notched bar impact test Part 1: Test procedure DIN EN ISO 148-2, Metallic materials Charpy notched bar
12、impact test Part 2: Testing of the testing machines (pendulum impact testers) DIN EN ISO 148-3, Metallic materials Charpy notched bar impact test Part 3: Preparation and characterization of Charpy V reference samples for the indirect testing of the testing machines (pendulum impact testers) DIN EN I
13、SO 6506-1, Metallic materials Brinell hardness test Part 1: Test procedure DIN EN ISO 6506-2, Metallic materials Brinell hardness test Part 2: Testing and calibration of the testing machines DIN EN ISO 6506-3, Metallic materials Brinell hardness test Part 3: Calibration of hardness comparison plates
14、 DIN EN ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test procedure DIN EN ISO 6507-2, Metallic materials Vickers hardness test Part 2: Testing and calibration of the testing machines DIN EN ISO 6507-3, Metallic materials Vickers hardness test Part 3: Calibration of hardness comparis
15、on plates DIN EN ISO 7500-1, Metallic materials Test of static uniaxial stress testing machines Part 1: Tensile and compression testing machines Testing and calibration of the load measuring devices DIN 22255:2012-05 5 DIN EN ISO 7500-1 Supplement 1, Metallic materials Test of static uniaxial stress
16、 testing machines Part 1: Tensile and compression testing machines Testing and calibration of the load measuring devices; general requirements for tensile, compression and bending test machines and their testing and calibration DIN EN ISO 7500-1 Supplement 3, Metallic materials Test of static uniaxi
17、al stress testing machines Part 1: Tensile and compression testing machines Testing and calibration of the load measuring devices; general requirements for fatigue testing machines and their testing and calibration DIN EN ISO 18265, Metallic materials Conversion of hardness values 3 Terms, definitio
18、ns and symbols For the purposes of this document, the following terms, definitions and symbols apply. 3.1 flat link chain chain, every second chain link of which is shaped as a flat link 3.2 flat link vertically aligned chain link, the external width of which is smaller than the external width of th
19、e corresponding round links 3.3 round link horizontally aligned chain link 3.4 nominal size d t nominal diameter and nominal pitch of the flat link chain 3.5 nominal diameter d material diameter in the leg area adjacent to the weld of the round link as a nominal value 3.6 thickness e leg width of th
20、e flat link NOTE See Figure 1. 3.7 weld diameter dsdiameter at the weld 3.8 weld length a length of the area dimensionally affected by the welding DIN 22255:2012-05 6 3.9 nominal pitch t internal length of a chain link as a nominal value 3.10 internal width b1,b3clear width of a chain link adjacent
21、to the weld and the opposite leg; b1for the round links, b3for the flat links 3.11 external width b2, b4overall external dimension of a chain link adjacent to the weld; b2for the round links, b4for the flat links 3.12 test force TF force at which the elongation at test force is measured during the s
22、tatic tensile test 3.13 breaking force BF maximum force which a sample of a flat link chain withstands during the course of a static tensile test until fracture occurs 3.14 working force WF maximum static force which the flat link chain is designed to withstand in operation 3.15 elongation at test f
23、orce the relation of the total extension of the sample at test force to the gauge length under measuring force 3.16 ultimate elongation A the relation of the total extension of the sample after fracture to the gauge length 5 t of the unloaded sample 3.17 lot size specified quantity from which the sa
24、mple(s) is/are selected 3.18 lower force Fulower force to be applied during the fatigue test 3.19 upper force Foupper force to be applied during the fatigue test DIN 22255:2012-05 7 4 Dimensions, designation and order details The flat link chains do not need to conform to the illustration in Figure
25、1; only the specified dimensions shall be met. Non-specified details shall be selected according to their purpose. Key 1 flat link 2 round link Figure 1 Chain strand Designation of a flat link chain according to DIN 22255 of nominal size 42 146 with a length tolerance according to Table 1: Flat link
26、 chain DIN 22255 42 146 1 Order details for 5 chain strands, each with 685 chain links of a flat link chain according to DIN 22255 of nominal size 42 146 with a length tolerance according to Table 2: 5 685 chain links DIN 22255 42 146 2 All chain strands of the flat link chain end with a round link,
27、 unless any other agreement is explicitly made. DIN 22255:2012-05 8 Table 1 Dimensions and masses Dimensions in millimetres Nominal size Nominal diameter Thick-ness Nominal pitch Width Mass per metre Gauge length Radius Round link Flat link Round link Internal External Internal External r d t d Tole
28、rances e t Tolerances b1b2b3b45 t Tolerances max. min. max. min. max. kg/m min. max. 26 92 26 0,8 30 92 0,9 30,1 87 30 75 13,7 460 1,0 40 43,5 30 108 30 0,9 34 108 1,1 34,1 99 34 87 18 540 1,1 46 49,5 34 126 34 1 38 126 1,3 38,1 111 38 99 22,7 630 1,3 52 55,5 38 126 38 1,1 42 126 1,3 42,1 123 42 111
29、 30,1 630 1,3 57,5 61,5 38 137 137 1,4 29 685 1,4 38 146 146 1,5 27,6 730 1,5 42 137 42 48,5 137 1,4 48,6 139 46 115 37 685 1,4 65 69,5 42 146 42 48,5 146 1,5 48,6 46 115 36 730 1,5 65 69,5 48 152 48 1,4 56 152 1,5 a a54 127 47,0 760 1,5 aaaThe dimensions b1, b2, rminand rmaxdepend on the production
30、 process and shall be agreed with the manufacturer, see also Annex B. DIN 22255:2012-05 9 Table 2 Matched long chain strands; gauge lengths and tolerances Dimensions in millimetres Nominal size Gauge length Length of chain strand Number of chain links Tolerance Tolerances d t n n t l 5 000 l 5 000 2
31、6 92 9 828 1,5 + 2 0 + 0,000 4 l 0 30 108 9 972 34 126 7 882 38 126 7 882 38 137 7 959 38 146 5 730 42 137 7 959 42 146 5 730 48 152 5 760 The gauge lengths and tolerances in Table 2 apply to matched long chain strands. An odd number of chain links is required. 5 Requirements 5.1 Material Flat link
32、chains shall be manufactured from a material selected by the manufacturer to comply with the requirements of this standard (at least 23 MnNiCrMo5-4, material No. 1.6758 according to DIN 17115). Materials with deviating chemical compositions shall be agreed when placing the order. 5.2 Manufacture The
33、 weld shall be produced by a flash-butt welding process and shall be positioned in the centre of a leg of the link. The weld shall be smoothly finished all round. 5.3 Heat treatment The complete flat link chain shall be hardened from a temperature range above the Ac3point with subsequent tempering i
34、n order to fulfil the specified mechanical properties. 5.4 Hardness Hardness 350 HV10 to 390 HV10 / 345 HBW10/3000 to 385 HBW10/3000 (ISO 18265 conversion 1 097 MPa to 1 220 MPa B.2 HV/HB). Deviating hardness values are possible for special types of flat link chains and shall be agreed. DIN 22255:20
35、12-05 10 5.5 Dimensions After completion of the production process of the flat link chains, the dimensions shall be within the tolerances specified in Table 1. In addition to Table 1, Table 2 also applies to matched long chain strands (twin-inboard chains). The weld diameter dsshall not be more than
36、 2 % less than the diameter measured adjacent to the weld and shall not exceed it by more than 3 %. The weld length a shall not exceed the dimension 0,7 d. 5.6 Mechanical properties After heat treatment, the complete flat link chain shall be subjected to a manufacturing proof force which corresponds
37、 to at least the values of the test force TF specified in Table 3. The upper limit of the manufacturing proof force shall not exceed the test force value TF by more than 15 %. The elongation at test force shall not exceed the value specified in Table 3. The breaking force BF shall reach at least the
38、 values specified in Table 3. The ultimate elongation A shall not be less than the value specified in Table 3. The bend deflection f shall not reveal any cracks or other visible defects. For flat link chains with a tensile strength of 1 097 MPa Rm 1 220 MPa, the base material in the leg and in the c
39、urve of non-aged normal samples with a V-notch shall exhibit a notched bar impact energy of 57 J at room temperature as the mean value of three samples per material batch used, whereby none of the individual values shall be below 70 % of the stipulated mean value (40 J). Samples for pendulum impact
40、testing of forged flat links are required from the leg area only. In the fatigue test, at least 70 000 cycles shall be achieved per sample under the forces specified in Table 4. Table 3 Nominal size-dependent mechanical properties and working forces Nominal size Test force Elongation at test force B
41、reaking force Ultimate elongation Bend deflection Working force d t TF BF A f WF kN % max. kN min. % min. mm kN max. 26 92 637 1,6 850 11 26 531 30 108 848 1 130 30 707 34 126 1 090 1 450 34 907 38 126 1 360 1 820 38 1 130 38 137 1 360 1 820 38 1 130 38 146 1 360 1 820 38 1 130 42 137 1 660 2 220 42
42、 1 380 42 146 1 660 2 220 42 1 380 48 152 1 900 2 900 48 1 810 DIN 22255:2012-05 11 Table 4 Fatigue test; lower force, upper force Nominal diameter FuFod kN kN 26 53 266 30 71 354 34 91 454 38 114 567 42 139 693 48 181 905 5.7 Surface condition The flat link chains are supplied with the surface cond
43、ition created by the heat treatment. Any deviating surfaces shall be agreed when placing the order. The flat link chains shall be free from surface cracks and notches which impair their usability. 6 Tests 6.1 General The tests shall be carried out following a visual assessment of the total quantity.
44、 With the exception of the dimension test, these tests will be destructive component tests on samples of the finished flat link chains taken lot by lot with a natural black surface finish. Due to the change in friction behaviour in the interlink contact area of corrosion-protected or bright flat lin
45、k chains, the breaking force values and ultimate elongation values shall be deemed to meet the requirements if the breaking force is at least 90 % and the ultimate elongation is at least 80 % of the respective values for the natural black flat steel link chain of the same nominal size. The scope of
46、tests covers the dimension test according to 6.4, the tensile test according to 6.5, the bending test according to 6.6 and the hardness test according to 6.7. Any further tests, such as the pendulum impact test according to 7.1 or fatigue test according to 7.2, shall be agreed when placing an order.
47、 6.2 Lot size A single lot comprises a manufacturing unit of 100 m or 100 chain strands provided these are not longer than 1 m. Any started manufacturing unit is deemed to be a single lot. 6.3 Sampling 6.3.1 The samples for the tensile test, the bending test, the pendulum impact test, the fatigue te
48、st and the hardness test are to be taken from the ends of the chain strands. The samples shall be dry and free from grease. 6.3.2 For the dimension test on the individual chain link, two round links and two flat links shall be randomly selected from a single lot. 6.3.3 For the tensile test, one samp
49、le shall be taken from each lot, so that three round links and two flat links are subjected to the tensile loading after being clamped. DIN 22255:2012-05 12 6.3.4 For the bending test, one round link and one flat link shall be taken from each lot, with the exception of forged flat links (as these are not welded). 6.3.5 For the hardness test, one round link
