The function of the bar shearing machine is to cut the long bar other profiles at one time according to the production requirements, separate them into single blank then make parts. The cutting process of bar shearing machine belongs to seamless cutting without cutting waste metal powder. It is an environmental protection, high efficiency, economical practical environmental protection equipment. When the bar shearer is shearing, the upper lower blades may cause deformation uneven cross-section quality problems. What are the factors affecting the shearing quality? Let's take a look.
1. Axial pressure
In the plastic shear of bar, if the axial pressure increases, the hydrostatic pressure in the shear deformation zone will increase, which is beneficial to enhance the plasticity of metal materials, inhibit the generation of shear cracks extend the plastic shear deformation stage, so as to increase the plastic shear bright zone, reduce the fracture zone improve the quality of shear section.
2. Axial clearance
The existence of axial clearance will lead to a significant decrease of hydrostatic pressure in the shear deformation zone, thus the plastic deformation zone will be reduced, the fracture surface will increase, which will affect the shear quality.
3. Clearance between upper lower blades
When the upper lower blades are sheared, the gap is too large too small, which can cause the cross-section unevenness of the round bar. Generally, the blade gap is about 2% - 3% of the diameter of the raw material.
4. Shear rate
The higher the shear rate, the better the section quality.
5. The length diameter ratio, shear form, temperature, material properties other factors have an impact on the quality of the shear section.