Cause of edge burr of brass strip and solving
Formation of edge burr in brass strip
The shearing process of brass strip consists of two stages: pressing deformation stage and shearing sliding stage.
When cutting brass strip, the material stress starts from elastic and plastic deformation. When the upper cutting edge descends to contact the material, the material will be subject to the pressure of the upper and lower cutting edges and produce elastic deformation. Due to the existence of moment M, the material will bend, that is, it will rise from the contact surface of the cutting edge. When the internal stress state meets the condition of plastic deformation, plastic deformation occurs, and the deformation is concentrated in the area near the cutting edge. Plastic deformation starts from the cutting edge. With the deepening of the cutting edge, the deformation zone develops and expands to the depth direction of the material until plastic deformation occurs in the whole thickness direction of the material, and one part of the material slides relative to the other. The moment M presses the material to the side surface of the cutting edge, so when the cutting edge moves relative to the material, these forces flatten the surface and form a bright band on the cut surface. When the material near the shear edge reaches the limit strain and stress value, microcracks will occur. After the cracks are generated, they will develop along the direction of large shear strain velocity until the lower cracks meet, and the material will be completely separated. Therefore, when the crack is formed, the burr is left on the shear section.
Solution to edge burr of copper strip
The main methods to reduce burr are as follows:
1. According to the situation of copper strip material, the cutting process should be adjusted reasonably, such as blade overlap and blade gap;
2. Ensure the quality and accuracy of the cutting edge meet the requirements;
3. Ensure that the accuracy of the shearing machine meets the requirements.
In order to remove the burr thoroughly, the edge of copper strip must be treated by rolling method and scraping method. Relatively speaking, scraping method is more advanced, which can treat the edge of brass strip into fillet or arc shape.
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