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Appearance Smoothness And Friction
- Sep 01, 2017 -

Enameled wire inspection items are roughly divided into five parts, the first part is the structural size, including the bare conductor diameter, non-roundness, maximum diameter and minimum film thickness. The second part is mechanical properties, including elongation test, rebound angle test, flexibility and adhesion, scratch resistance. The third part is the heat resistance, including thermal aging test, thermal shock test, heat and softening breakdown test. The fourth part is electrical performance, including DC

Resistance, breakdown voltage, pinhole test. The fifth part is resistant to chemical properties, including acid resistance, alkali resistance, salt spray resistance, moisture resistance, oil resistance, solvent resistance, resistance to refrigerant, radiation resistance and other aspects of performance.

Structural size of the project will not have much of a problem, mainly the choice of paint remover is more important, because there are many kinds of enameled wire paint film, different paint for different paint remover, for polyurethane copper enameled wire should be Benzohydrin, hydrogen peroxide, formic acid, methyl pyrrolidone as the main component of the water-based paint remover. For different types of paint film should use the appropriate paint remover. Second, in the preparation of samples, should be avoided on the enameled wire caused by pulling, bending, corrosion, if there is such an impact, it is easy to affect the test results.

(1) elongation is simulated enameled wire winding process and established, the purpose is to control the winding wire winding adaptability, to ensure smooth operation. Enameled wire after stretching, its adhesion, scratch resistance, elasticity, thermal shock, solvent resistance will decline. The factors that affect the elongation are the conductor material itself, whether there are other metal alloys, whether the annealing is incomplete, whether the impurities are more.

    (2) rebound angle test is an important indicator of the softness of enameled wire, the test should be noted that the choice of lap and speed according to the standard, the speed of the test results are relatively large. The main reason for the impact of the rebound is the softness and annealing properties of the conductor material. The faster the speed, the greater the rebound angle. Fast speed, annealing time is short, rebound angle increases.

    (3) Flexibility and adhesion test including winding, stretching, rapid pull off, stripping twist test. The enameled wire is subjected to two external forces when winding the coil. A) tensile force, if the elasticity of the film, the film after the elongation of the force can not keep up with the elongation of the conductor, the film will crack. B) bending force, bending the outer edge of the film elongation, the inner edge of the film is compressed, if the elasticity is not good, the film will crack. Fine lines are easily stretched,

With elongation test; thick line by the impact of large bending, with the winding test. The elongation of the paint increases as the winding diameter decreases. 5 times the winding elongation of 16.7%; 4 times the winding elongation of 20%; 3 times the winding elongation of 25%; 2 times the winding elongation of 33.3%; 1 times the elongation of 50%.

    (4) scratch resistance of the main assessment of the enameled wire skin friction, the main factor is the film surface smoothness and friction, and material. Test should be selected standard pencil, and according to the requirements of pencil head processing.

Chemical resistance including acid resistance, alkali resistance, salt spray resistance, moisture resistance, oil resistance, solvent resistance, resistance to refrigerant, radiation resistance and other aspects of performance.

       In the coil dipping process, enameled wire is not only subject to thermal shock and softening breakdown of the thermal performance test, but also can tolerate impregnated paint toluene, xylene, petroleum solvents, oil and other solvent erosion. Different paint film on the different solvents have different tolerance, impregnation should be based on the characteristics of enameled wire selection only with the enameled wire to adapt to the solvent impregnation paint.

       The solvent resistance of the paint film depends primarily on the characteristics of the paint film itself. From the molecular structure, the film is the body structure, cross-linking chain is longer and the degree of cross-linking control within a certain range, it has a "limited swelling". The swelling of the film can be understood as the phenomenon of increasing the distance between the molecular chains due to the gravitational force between the solute molecules and the solvent molecules. In some solvents, the film is part of the structure of the film can also swell, drilling into the gap between the polymer chain gap, reducing the role of polymer chain between the gravitational force, resulting in the film softening, sticky and hardness decreased Happening.

       Enameled wire detection With the emergence of new products, new materials, new technologies, there are more development and changes, at any time to deal with the detection of new products, the inspection staff of the knowledge and ability to have higher requirements. In the detection, more learning, thinking, multi-reference standard practice, in order to reduce the chance of error.