Home > Knowledge > Content
The ability of plastic deformation at high temperature
- Sep 01, 2017 -

Enameled wire is a major variety of winding wire, composed of two parts of the conductor and insulation, the bare wire after annealing softening, and then after several painting, baking. Is the main raw material of electrical products, electrical appliances and household appliances, especially in recent years, the power industry to achieve sustained and rapid growth, the rapid development of household appliances to the application of enameled wire to bring a broader field. It is not easy to produce enameled wire that meets the requirements of the standard and meets the requirements of the customer. It is affected by factors such as raw material quality, process parameters, production equipment and environment. Therefore, the quality characteristics of various enameled wires are different, but they all have mechanical Performance, chemical properties, electrical properties, thermal performance of the four major performance.

Heat resistance

    (1) the impact of thermal aging test factors: from the paint to the enameled wire baking film, and then to the aging process of the aging film is the polymer polymerization growth and cracking process of decline. In the paint is generally synthesized in the primary polymer, enameled primary polymer cross-linked into high polymer, while the thermal decomposition reaction, aging is baking to continue. Test Note: The aging chamber ventilation, temperature fluctuations, the sample removed, should be cooled at room temperature to prevent the sample from quenching, affecting the test data.

    (2) thermal shock test is to study the enameled wire film under the action of mechanical stress on the thermal effect of tolerance. The paint film of the enameled wire is elongated due to extension or winding, and the relative displacement between the molecular chains keeps the internal stress in the film. For the same kind of paint, it is also related to the ratio of raw materials. Baking temperature is too high or too low are caused by thermal shock performance. Note that the pulling force of the sample during winding can not be too large, and the samples should be arranged closely together.

    (3) heat-resistant softening breakdown test. In the coil, the lower enameled wire by the upper enameled wire tension caused by the pressure, if the enameled wire in the pre-bake or drying process, or in high temperature operation, the film heat softening, In the role of pressure gradually squeezed thin, may lead to the coil of the inter-turn short circuit. The heat-resistant softening breakdown test measures the ability of the film to withstand thermal deformation under mechanical external force, that is, the ability to study the plastic deformation of the film under high pressure. This test is a combination of heat, electricity and force The

       Factors affecting the test data: load weight, starting temperature and heating rate.

  Electrical performance is mainly DC resistance, breakdown voltage, film continuity, pinhole test, in which the DC resistance problem is not big, the breakdown voltage is mainly to prepare the test sample twisting process need to pay attention to the weight of the weight and twisted circle number. Pinhole test is one of the most important items of enameled wire, fine enameled wire wrapped around the coil number of winding, winding tight, line and line contact surface, if the enameled wire paint pinhole, the two turns between the pinhole may

Coincidence, causing a short circuit.

       Factors affecting the pinhole: raw materials, conductors, production process, test conditions.