Method for detecting adhesiveness of varnished wire paint film

Abstract

The method discloses a method for detecting adhesiveness of a varnished wire paint film. The method for detecting adhesiveness of the varnished wire paint film comprises the following steps of: taking large circle test samples which are different in length and wound in different diameters according to the size of the diameter of a varnished wire; dropping phenolphthalein alcohol solution indicators in salt water; placing the circle test samples into a phenolphthalein salt water solution, inserting a positive electrode bar, and connecting the negative electrode with one ends of the circle test samples; connecting a 12V direct-current power supply for 1 minute; checking that whether bubbling needle holes are generated in the circle test samples or not, and if not, the circle test samples are primary test qualified products; straightening the circle test samples which are checked out along the diameter direction; then winding into small-diameter circle test samples; placing the small circle test samples into a phenolphthalein salt water solution, inserting the positive electrode into the solution, and connecting the negative electrode with the circle test samples; and checking that whether bubbling needle holes are generated in the circle test samples or not after connecting a direct-current power supply for one minute, and if the number of the needle holes is smaller than two, the circle test samples are qualified products. According to the invention, the qualified test samples proved by the salt water needle hole test are additionally straightened and wound by round bars, and then are subjected to the salt water needle hole test to be tested again, so that the adhesiveness of the varnished wire paint film is detected intuitively, rapidly and accurately, and reliable quality of the varnished wire is guaranteed.

Description

technical field [0001] The invention relates to enameled wire detection, in particular to a method for detecting enameled wire paint film adhesion. Background technique [0002] The adhesion of the enameled wire paint film is the comprehensive performance of the enameled wire without visible cracking or separation from the conductor when it is subjected to elongated mechanical stress. It reflects that the enameled wire is subjected to external forces such as stretching, curling, bending or twisting. The ability to crack or lose adhesion. The adhesion of the paint film and the inherent softness of the paint film are two interrelated properties. During the winding and forming process, the winding wire is subjected to bending and elongation for many times. If the adhesion between the paint film and the metal is not good, it is easy to cause the paint film to break and even fall off; at the same time, the plastic deformation of the paint film and the metal is very different. ,...

AI Technical Summary

Problems solved by technology

[0003] Among the test methods for detecting the "paint film adhesion" performance of enameled wire, there are four tests: round rod winding test, tensile test, sudden pull test, and peeling test. The final result of this test item is obtained by using a certain multiple The magnifying glass is used to check whether the sample is cracked or loses adhesion to judge. The judgment is often in a state of speciousness and it is difficult to draw conclusions. The judgment of the test results has a certain degree of limitation.

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