![]() ![]() If you are designing a threaded leaf chain anchor the table below gives you an idea of the variation in strength achieved by different threads. Using this material will provide enough strength for the bolt so that you do not need to complete any strengthening operations after production. Using that area to calculate strength we find a material between 800 to 900 N/mm2 is normally required – we start our calculations using 850 N/mm2. This means that the surface area in tensile and shear are fairly consistent from our experience. A choice between ends outers or ends inner finish will determine the vast majority of anchor head dimensions. At which point you may then decide to specify an anchor bolt that matches the leaf chain’s strength – but this is not strictly necessary – the anchor bolt strength only needs to exceed your required strength.Īs the slot and hole dimensions are of fixed, standard sizes, there is limited scope for varying the head dimensions. It is accepted practice and a part of most machinery standards that leaf chain anchors should be equal in strength to the leaf chain that is attached to them.īut for various reasons you may have over specified the leaf chain – using a leaf chain that is well over the safety factor you are working to in your design. The thread strength also needs to be equal to, or greater than, the strength of the leaf chain. ![]() ![]() This surface area needs to be sufficient to provide a strength equal to, or greater than, the Ultimate Tensile Strength (UTS) of the leaf chain. ![]() The surface area of the head and slots affect tensile and shear strength. Leaf chain anchor bolts see varying forces, so when designing new leaf chain anchor bolts you need to look at two key areas, the head strength and the thread strength. Using this standard will ensure interchangeability should a purchasing team decide to change suppliers, or another brand of leaf chain is fitted as a replacement. While each manufacturer’s leaf chain can have slightly different dimensions, we would always recommend making the slots and holes to the sizes shown in ISO4347. Here are the main considerations when designing an anchor bolt for use with a leaf chain. Leaf chain anchor bolts are a crucial part of a leaf chain assembly – if they are not designed without considering all the relevant factors then they may not conform to industry standards or they may even fail. Key considerations when designing leaf chain anchor bolts ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |