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tensile resistance wear resistance fatigue resistance corrosion resistance lightness/efficiency WEAR RESISTANCE : A chain undergoes wear at the articulations, which are made up of two components, bearing pins and bushes. When the chain engages on the sprockets, the pins of the chain turn in the bushes at a particular angle. The friction created in the process is what causes wear. To avoid this wear, the surface areas in contact with one another must be as hard and accurate as possible. SEDIS's special manufacturing process (progression tooling, biconical bushes) ensures that surface contact during articulation is faultless. The heat treatments generally used by the various chain manufacturers give the following levels of hardness, measured in terms of VICKERS : Alloy steel articulation + hardening : Hardness: 500 VICKERS. Alloy steel articulation + cementation + hardening : Hardness: 650 VICKERS. Alloy steel articulation + carbonitriding : Hardness: 500 VICKERS. As well as performing the traditional treatments listed above, SEDIS has created its own technology which gives significantly better results than those listed above. The technology in question is called DELTA (SEDIS patent) It was specially designed for the most severe conditions in terms of: - environment: abrasive dust, mud, sand, water etc. - operation: high speed. - maintenance: random lubrication. This treatment ensures hardness of 2000 VICKERS. This exceptional level of hardness is a guarantee of minimum wear, i.e. minimum chain elongation. |
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