About the cutting accuracy of Decoiler cum straightener disc shears

　　The diameter and thickness of the disc knife:

　　The reserved size of the axial backlash of the disc cutter should be determined according to the thickness and strength of the cut strip. Generally, ensure that the ratio of the tearing area to the shearing area is about 2:1. According to the color and roughness of the sheared section, it can be judged whether the side clearance is appropriate: the section is smooth and shiny, and the side clearance is too small; the section is lead gray, and the side clearance is slightly smaller; The cross-section is white and slightly lead-grey, with proper side clearance; the cross-section is white, granular and rough, with too large side clearance. If the backlash is too large, shear burrs will appear. If the backlash is too small, it will cause excessive load on the disc shear, severe wear of the cutter head, and shorter service life. In the production process, the backlash values on both sides of the disc cutter should be as consistent as possible. Because the side with large backlash, the indentation of the local shearing will become larger, and the stretch of the strip will be greater than the side with small backlash, and the shearing sickle will appear. In particular, steel plates (narrow steel strips) with a small ratio of plate thickness to plate width are more likely to have a sickle bend.

　　Coincidence:

　　Tool axis accuracy: The tool axis accuracy includes horizontal swing, vertical swing and axial movement of the tool axis. Generally, the horizontal and vertical swing accuracy of the tool shaft is required to be within ±0.005mm. The axial movement accuracy is required to be within ±0.005mm. The accuracy of the cutter shaft plays a very important role in realizing the stability of the cutter head backlash and the deflection of the cutter head.