The process of steel plate from being deformed by pressing to being cut by shearing is a very responsible physical process, relying on the interaction of forces. In the detailed analysis of the shearing process of the shearing machine, a question was raised: the size of the unit shearing resistance will directly affect the cutting quality of the sheet trimming shearing machine. So, what problems will affect the unit shear resistance?
When producing steel plates, they are produced into materials with different strengths according to different element ratios. The higher the strength of the material, the greater the shear resistance, and the lower the plasticity, which makes it difficult to shear and the quality is also poor. It also damages the shear edge. Therefore, it is important to pay attention to cutting materials.
During the shearing process of the sheet trimming shearing machine, the steel plate is heated to high temperature to make it easier to shear. At this time, the higher the temperature, the smaller the unit shear resistance, the deeper the shear edge will be cut. The temperature plays a very important role.
During the initial stage of shearing the steel plate, the dependence is on the speed of the steel plate deformation and the cut speed of the shear edge. This not only relates to the material of the steel but also to the temperature of the shearing machine. Of course, if it is a cold shear, this effect does not exist.
As the steel plate continues to move, it will cause rotational displacement of the steel plate. At this time, in order to ensure the cutting quality, pressure needs to be applied on both sides of the shear edge of the steel plate. The size of the distance between the two sides directly affects the force of the steel plate. If the distance is too large or too small, the force of the steel plate will be unbalanced and cause rotational displacement, which will greatly reduce the quality of cutting by the sheet trimming shearing machine.
As we all know, under the same force, the larger the area, the smaller the unit force. At this time, if the radius of the shear edge is larger, the reaction force generated by the steel plate will be dispersed, resulting in a larger unit shear resistance. Therefore, the larger the blunt radius, the slower the knife is.
The process of cutting by the sheet trimming shearing machine is a very precise physical process, where many factors can directly affect the cutting quality and reduce work efficiency if not paid enough attention to. Apart from the five points listed above, the friction coefficient between the pressure plate, the shear edge, and the steel plate and the shape of the shear edge will also have an impact, but relatively small.