When the bending machine bends, the workpiece may indeed have cracks or deformation. These problems are usually caused by a variety of factors, and the following is a detailed analysis of these problems:

Causes of cracks in the workpiece:

Material characteristics:

There may be defects in the workpiece material itself, such as non-metallic inclusions inside the metal, which may become the starting point of cracks when bending.

The hardness, ductility and toughness of the material also affect its cracking resistance.

Effects after cutting or blanking:

After the material is cut or blanked, the edge often appears burrs or small cracks, which are easy to form stress concentration when bending, resulting in the workpiece being broken.

Stress during bending:

When bending, the workpiece is subjected to complex stress distribution, especially when the amount of tensile deformation exceeds the tensile limit value of the material itself, cracks are easy to occur.

Causes of workpiece deformation:

Recovery of elastic deformation:

In the bending process, the plastic deformation of the metal material is accompanied by elastic deformation. After bending, due to the recovery of elastic deformation, the workpiece may rebound, resulting in deviations from the size and shape of the mold.

Bending speed and pressure:

Too fast bending speed or too much pressure may cause deformation of the workpiece. Too fast bending speed may cause excessive stress in the bending process of the material, and too much pressure may cause the workpiece to exceed its elastic limit and plastic deformation.

Impact of mold and equipment:

The design and use state of the die have a great influence on the deformation of the workpiece. For example, the size of the V slot and the size of the R Angle of the mold will affect the bending quality and deformation of the workpiece.

The accuracy and stability of the equipment are also important factors affecting the deformation of the workpiece. If the equipment has errors or instability, the workpiece is prone to deformation during bending.

To sum up, the workpiece may indeed crack or deform when the bending machine bends. In order to avoid these problems, it is necessary to comprehensively consider multiple factors such as material characteristics, bending speed, pressure, mold design and equipment accuracy, and carry out corresponding optimization and adjustment.