![]() But the LV is not a specification on crimp monitors it is a specification on terminal characteristics. Today’s crimp force monitors detect area differences as a result of crimp defects but analysis does not go to this detail. ![]() Therefore, the different area regions, X 0 and X 1 are theoretical and will only be considered during initial validation of the terminal. Similarly, the force curve data in the roll-in area is typically ignored during monitoring with filters. The LV provides a formula to determine specific locations for X 0 and X 1.Īt this time, however, no crimp force monitor analyzes the area under the crimp curve as described in the LV. X 1 is generally where the good crimp and empty crimp curves begin to diverge. X 0 is generally where the good crimp and the insulation-in-the-crimp curves begin to diverge. However, LV 214-4 analyzes relative deviation and defines the positions X 0 and X 1. Most monitors ignore this portion because forces are usually inconsistent and this part of the crimp process is not very important. ![]() The roll-in area is the beginning of a crimp force curve where the terminal wings begin to roll in and close around the wire. The LV looks closely at the “roll-in” portion of the crimp. Differences in each of these areas must be detectable for the corresponding error mode. Alternatively, the area for insulation-in-the-crimp is the area between the insulation-in-the-crimp and the good crimp curves. Similarly, the missing strand area is the area between the missing strand curve and the empty crimp curve. The good crimp area is the area between the good crimp curve and the empty crimp curve. However, LV 214-4 defines four area segments one for good crimps and one for each error mode, specifically, empty crimp, missing strands and insulation-in-the-crimp. An empty crimp has a full insulation crimp, but the conductor crimp is empty.įor many years, crimp force monitors have analyzed the total area under the crimp curve. Crimp parameters are at the nominal values as specified by the manufacturer. In a good crimp, the conductor crimp is filled with all conductor strands and the insolation crimp with all undamaged insulation material. LV 214-4 defines what an empty crimp is something that is not clear to all. Headroom is the difference between the peak forces of the average good crimp and empty crimp curves, also expressed as a percentage. Relative deviation is the variation of peak force expressed as a percentage. The standard focuses on relative deviation of force curves and headroom, both common concepts with regard to crimp force monitoring. Though it is currently in draft form and many points are still largely theoretical, the standard has been in progress for many years. To be used in an automotive wire harness, the terminal must exhibit certain crimp force characteristics so that typical crimp force monitors can effectively detect critical error modes. The standard addresses the ability of terminals to be effectively evaluated by crimp force monitors. The standard outlines terminal requirements specifically for the automotive industry. LV 214-4 is an automotive standard that was developed by representatives of German car manufacturers Audi AG, BMW AG, Daimler AG, Porsche AG and Volkswagen AG. These standards and specifications are constantly evolving and increasing in detail, especially as monitoring technology improves. Within the wire processing industry, there are many standards that manufacturers may choose or be required to adhere to. ![]() Standards and specifications from various organizations provide a guideline from which manufacturers can measure different areas of quality, while also providing the end-user with the reassurance they are purchasing a trustworthy, long-lasting product. 15, 2016 – It goes without saying that every manufacturer wants to ensure they are producing a quality product.
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