Ganter Norm Standard Parts - Catalogue Page 2133
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Computing the Strength of Indexing Plungers for Shear Loads / Flexure Loads of the Plunger Pin Shear loads Provided that a miniscule gap remains between the guide of the indexing plunger and the indexing bore hole opposite, the load can be reduced to a clean shear action. As this is normally not the case, the “flexure” load case should preferably be considered on the following page. Approximately 80 % of the bolt’s tensile strength is assumed for the shear strength. This approach calculates against the tensile strength Rm, i.e. against the indexing pin shearing off. Any pre-existing and remaining deformation may, however, mean that the indexing plunger can be used no longer. To ensure the permanent and proper function of the indexing plunger, the yield limit Re must be considered in place of the tensile strength Rm. Formulas for computation Bolt cross-section S= d² x π 4 Limit tension Shear force IJa = 0,8 x Rm F = S x IJa = d² x π x 0,8 x Rm 4 Material characteristics The tensile strength shown in the table opposite (Rm) and the yield or substitute yield limit (Re / Rp 0,2) have been determine in tension tests involving tension specimen in accordance with DIN 50125- B6-30 These tests constitute the basis for the load bearing details given herein. Material Re Rm Description Material no. in N/mm² in N/mm² C45Pb 1.0504 560 640 580 740 X 10 CrNiS 18 9 AISI 303 Computing examples, load values Example: Indexing plungers with a bolt diameter of 6 mm made of Stainless Steel with a yield limit of Re = 580 N/mm², computation against permanent deformation, the maximum permissible shear stress is wanted. Fper = (6 mm)² x π x 0,8 x 580 N/mm² = 13120 N 4 d Bolt diameter 3 4 5 6 8 10 12 16 Max. force F in N, acc. to material and strength value differs C45Pb / 1.0504 X 10 CrNiS 18 9 / 1.4305 at R e at R m at R e at R m 3160 5620 8790 12660 22510 35180 50660 90070 3610 6430 10050 14470 25730 40210 57900 102940 3270 5830 9110 13120 23320 36440 52470 93290 4180 7430 11620 16730 29750 46490 66950 119020 Safety information On principle, the design also needs an adequate safety coefficient to be taken into account. The usual safety coefficients under static load 1,2 to 1,5; pulsating 1,8 to 2,4 and alternating 3 to 4. Disclaimer: Our information and recommendations are given with non-binding effect and ruling out any liability, unless we have expressly committed ourselves in writing to provide information and recommendations. All products are standard elements for versatile uses and as such are subject to extensive standard tests. You should carry out your own test series to verify whether a certain product is suitable for your specific applications. We cannot be held responsible for this. Page 2132 | Information for Loads
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