56results about How to "Avoid skin effect" patented technology

The invention provides hard tube end forming equipment and a forming method. The hard tube end forming equipment comprises a feeding portion (10), a clamping portion (20) and an extrusion forming portion (30), wherein the clamping portion (20) is used for fixing a hard tube (40) to be formed, and the extrusion forming portion (30) is used for forming a tube end structure of the hard tube (40) to be formed. The hard tube end forming equipment is characterized in that a heating portion (50) is further arranged between the clamping portion (20) and the extrusion forming portion (30). The hard tube end forming equipment is stable in structure, high in reliability, low in cost, high in production efficiency, high in positioning precision and fine in forming quality.

The invention discloses a power transmission multi-cable assembly device constituted by conductive joints and sheath pipes. Each of the sheath pipe is constituted by a pipe wall and a differentiation separation board, and the differentiation separation board is connected with the inner surface of the pipe wall, and can be used to divide the inner cavity of each of the sheath pipes into at least two wire passing cavities having the same areas of the cross sections. The conductive joints are parallely connected by connecting lugs, the number of which are equal to the number of the wire cavities, and are disposed on an insulation pedestal. Each of the connecting lugs is constituted by a connecting tongue and a socketed pipe, and the connecting tongue is additionally provided with at least one connecting screw hole, and the inner surface of each of the socketed pipes is uniformly provided with cone-shaped fastening teeth. The use method comprises four steps: determining of total wire diameter, differentiation of cables, assembly, and wiring. The use requirements of the large-cross section cables requiring various diameters can be flexibly and easily satisfied, and the production costs of the large-cross section cables can be reduced. The problem of the frequent occurrence of the skin effect of the large-cross section cables can be effectively solved, and therefore the use performance of the power cables can be greatly improved.

The invention provides a copper-based composite material resistant to electric ablation, wear-resisting and friction-reducing, and the raw materials include Sn, Pb, Cr, C, TiB 2 and copper. The invention also provides a preparation method of the composite material. In the electric ablation-resistant, wear-resistant and friction-reducing copper-based composite material of the present invention, graphite is added by copper-coated graphite powder, because the copper layer on the graphite surface can reduce the interface energy and density difference between it and the copper alloy powder, making it The distribution in the composite is more uniform. In the preparation method, the heating is realized by induction rapid heating, and then the temperature is uniform, which not only shortens the heating time and saves energy consumption, but also realizes uniform temperature heating, avoiding the skin effect and wrapping caused by the long time of ordinary induction heating damage, while avoiding the problem that the cross-sectional temperature cannot be achieved due to the poor thermal conductivity of the powder.