After longitudinal shearing and transverse shearing, the silicon steel coils are stacked into iron cores. The quality control of the iron core generally includes punching of various shapes, notches of various shapes, longitudinal shearing of silicon steel sheets and transverse shearing of various plate shapes to control various quality indicators. Next, Ruyi Technology will provide You bring the effect of slitting and shearing on the quality of the iron core.

The core quality is mainly affected by the following two points:

1. Core burrs

The burr size of the iron core is an important indicator to measure the punching and shearing quality of the iron filings. Large burrs will not only cause short circuits and increase eddy current losses, but also seriously affect stack size and quality, increasing iron loss. Therefore, punching and shearing workers need to do everything possible to carefully operate, or use some method to remove the burrs that have been generated.

The mechanism of stamping and shearing is that when the upper die: falls on the workpiece, the workpiece begins to deform elastically (the first stage); as the upper die continues to descend, the workpiece begins to plastically deform (the second stage); the upper die continues to descend, the workpiece begins to deform The plastic deformation gradually expands until all the material starts to crack from the cutting edge part reaching the yield strength (third stage); the upper die continues to descend, and the crack is sheared in the stress direction of the cutting edge part (formed with the upper die and the lower die). A certain angle die centerline).

If the gap between the molds is too small, the upper and lower cracks cannot be connected, but are parallel to each other at a certain distance. When the material is best separated, due to extrusion, burrs, cracks or flakes will appear in the cross section between the two cracks, and the upper part of the workpiece will form a second glossy narrow with a burr or toothed edge strip, the narrow strip is inverted conical and easily gnawed on the die. The service life of the mold will be shortened.

To solve the burr problem, in addition to requiring the mold designer to correctly select the mold material, structure and clearance; the manufacturing personnel should strictly grasp the key points such as processing and fine grinding to make the finished mold qualified. In addition, the following requirements must be made to the operator:

1) Carefully install, repeatedly adjust and check the mold carefully, so that the mold is in a normal state from the beginning of use. Try to avoid a lot of waste caused by improper adjustment, and the mold will be disposed of after being gnawed.

2) After punching or cutting a small amount of finished products, insist on self-inspection and random inspection. If the burr exceeds the standard, take corresponding measures to solve it in time, and check regularly in the future.

3) When checking for burrs. Generally speaking, the burr height can be measured with a micrometer, or it can be touched by hand (do not touch when the machine is running). when

3. In contrast, measuring instruments or optical instruments can be used, which have very small edge deflection and arc deviation values, as well as microplatform silicon steel transverse shear lines. Obviously, the angular error and length measurements of the finished product are different due to the different methods used.

The above is the impact of the slitting and horizontal shearing on the quality of the iron core brought by Ruyi Technology. You are welcome to come to our company for the needs of the horizontal shearing machine!