The principle process of overlapping riveting of rotor core is to punch overlapping riveting points with certain geometric shapes in the appropriate parts of stator and rotor punching sheets, most of which are concave holes in the upper part and convex holes in the lower part, and then insert the convex part of the previous punching sheet with the same size into the concave hole of the next punching sheet to achieve the purpose of fastening connection. In the process of iron core forming, the convex part of the last overlapping riveting point is correctly made at the blanking station of punching sheet.

In this way, through the continuous punching of high-speed automatic punching machine, iron cores with orderly arrangement, same burr direction and certain stack thickness can be obtained.

principle of operation

Motor iron core mold, as the core component of motor manufacturing, iron core plays a decisive role in the whole motor. Therefore, as an iron core mold for mass production of iron cores, it is even more important.

In the past, iron cores were punched into pieces with single or continuous dies, and then made into required thickness by riveting or welding. The material of iron core is generally silicon steel, and the thickness of single piece is 0.5mm, 0.35mm, 0.2mm, etc.

This process is inefficient and uses many people, and is gradually replaced by automatic riveting mandrel. Here I will focus on the situation of automatic riveting mandrel.