Enameled wire refers to copper wire or aluminum wire coated with a layer of insulating material, which is mainly used to manufacture electromagnetic coils in electric motors. It consists of two parts: a conductor and an insulating layer. The external insulating layer of enameled wire serves to insulate and protect the conductor, and its quality is of the utmost importance. A qualified product is defined by an external insulating enamel film free from peeling, oxidation, scratches, damage and kinking, as well as neat wire arrangement. The product qualification rate can reflect the stability of product quality and the rationality of material processes. Traditional testing methods rely on visual inspection and manual touch to check the surface smoothness, presence of defects and color uniformity, which have inherent limitations. Below, we introduce a precise testing method for this purpose:
The excellent performance of the microscope, such as continuous zoom, large depth of field and high resolution, clearly reveals the surface conditions of the enameled wire. Meanwhile, it can be optionally equipped with a digital camera with measurement functions, which can more quickly and effectively improve the efficiency of qualitative inspection of product appearance.
In addition, metallographic sample preparation equipment shall be equipped according to the product before testing, as follows: (For the specific operation process, please refer to other articles in our website)
1.Cold mounting: Place the sample upright in a silicone mold with a transparent triangular clamp. Prepare the cold mounting compound in proportion for mounting, ensuring a tight, gap-free bond between the sample edge and the enamel layer of the enameled wire, as shown in the figure below:
2.Grinding and Polishing: Set the grinding and polishing parameters on a fully automatic metallographic grinding and polishing machine, and use metallographic sandpaper to grind and polish the mounted enameled wire specimens to form two flat surfaces for microscopic observation of the specimens, as shown in the figure below.
Post time: Feb-05-2026
