The rated breaking force of the wire is calculated from the strength of all aluminum single wires and reinforcements. However, the actual breaking force will be deviated from the actual calculated value. The main reason is that the strength of each single wire is not fully utilized. Therefore, when designing the product, not only must meet the minimum strength requirements, but also how to excavate the strength of each single line. Not only is the material fully utilized, but the overall performance of the wire is also greatly improved.
With the continuous upgrading of the power system, various new products have emerged, such as steel core aluminum stranded wire, aluminum-clad steel core aluminum stranded wire, aluminum-clad steel core aluminum alloy stranded wire, aluminum alloy stranded wire, aluminum alloy core aluminum stranded wire Line, aluminum-clad steel core heat-resistant aluminum alloy stranded wire, etc. However, the overall tensile properties have always been a major issue in the design of overhead stranded products.
Aluminum alloy core aluminum stranded wire overall performance improvement skills:
First, adjust the uniformity of each single line from the intensity.
Each single wire has a different degree of stress bearing depending on its strength. Just as a tensile sensor has the best stretch range, it will not only damage the equipment but also cause data deviations beyond its range. The same is true for aluminum single wires, and the strength of aluminum single wires of different strengths is different. When these single wires with large deviations are twisted together, the stress is evenly distributed to each single wire. The single wire with low strength will be broken due to insufficient bearing capacity, and the single wire with high strength will not play its role. . Therefore, the extremely poor strength is an important parameter for testing the mechanical device performance utilization.
Second, adjust the elongation and the aspect ratio from the elongation and the pitch ratio.
The elongation of the steel wire also has a large influence on the overall tensile properties. A large number of experiments have proved that the overall breaking force of aluminum-clad steel-cored aluminum stranded wire is prone to failure. The main reason is because the elongation of aluminum-clad steel is too small. The utilization of mechanical properties of aluminum wire is too low. When the aluminum wire is stranded, the smaller the pitch, the better the ductility. The higher the elongation requirement of the steel wire. The elongation of the aluminum clad steel wire is about 1.0, and the aluminum wire is also about 1.0. With the expansion and contraction of the twisting pitch, the elongation of the steel wire is far from enough. Therefore, the design of the wire for the aluminum clad steel wire can appropriately increase the pitch diameter ratio, reduce the gap between the aluminum clad steel wire and the aluminum wire elongation, and more exert the mechanical properties of the aluminum wire. In short, the elongation of the aluminum wire + the elongation due to the pitch = the elongation of the steel wire.
Third, from the arrangement structure, the single line elongation is larger in the outermost layer.
Tests have shown that single-line fractures mostly break at the outermost layer. The elongation of the outermost layer is also a key factor affecting the overall breaking force. When the strength of the single wire is constant, the higher the elongation, the greater the strength of the single-wire mechanical properties can be maximized.
At present, the performance of most of the wires is not fully exerted, and the margin is very large. This process is a long-term exploration process, which requires a lot of experiments and data analysis. Here is just an idea and it is practiced. In short, when designing a product, the ultimate goal is to achieve the best results for all single wires when the wire is stretched to 1%, so that the overall performance of the wire will be greatly improved.
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