Cold bending roll pass design

Design of Cold Bending Roller Holes

Roller is a kind of metalworking machinery. It is based on the principle of plastic deformation, and metal products can be processed through the rollers. In the cold bending process of metal metal products, forming rollers are used. It is necessary to design a hole for the roller to affect the quality of the bending.

The design of the cold bending roller hole is mainly based on the width of the bent parts. Under normal circumstances, if the width of the bent parts is less than 60mm, it is necessary to consider using one pair of rollers with 2 holes. When the width of the bent parts is more than 100mm, the rollers with 3 or 4 rollers can be used. The open angle of the cold bending roller hole should be greater than 90°. In order to prevent the edge of the finished product in bending or improper expansion, when the punched material thickness is greater than 8mm, it is necessary to design the front and rear wall round. It should be as small as possible in the design, generally within 2mm.

Another factor that should be taken into account when designing the cold bending roller hole is the roll radius of the roller. The roll radius of the roller should be larger than the radius of the finished product in order to ensure the forming quality of the finished product. In addition, the hole of the bent forming should be in line with the hole center of the roller, so as to make the two overlap together to ensure the forming accuracy of the bent parts. The size of the hole in the middle should be large enough to make it easier for the roller to pass through. When using the three hole roller, the two side hole centers should be close to the hole center of the roller and the other hole center should be further away from the hole center of the roller.

In order to reduce the bending resistance and prevent the die wedging in the bent process, it is necessary to design inclined surface in the die corner of the cold bending roller. The tilt direction and angle should be designed according to the bending process and material properties. Generally, the tilting degree should be within 15°.

In addition, it is necessary to consider the axial force generated in the process of cold bending roller in the design. Usually, the axial opening angle should be designed as small as possible. The general principle is that when the height of the material is less than or equal to 5mm, the opening angle should not exceed 5°; when the height is greater than 5mm, the angle can be appropriately increased; when the angle of bending is greater than 90°, no axial opening should be designed.

In summary, the design of the cold bending roller hole is a very important part of the bending process. In the design, it is necessary to consider the width of the bent material, the radius of the roller hole, the inclination of the die corner and the axial opening angle. These design factors are closely related to the forming quality of the finished product. Therefore, it is necessary to make a reasonable design to ensure the forming quality.

Cold bending roll pass design is important in the production of cold rolling. It can improve the surface quality of product and reduce the cost of the cold rolling process. The design of cold bending roll pass needs to consider the drawing force, the product design, the material properties and the board characteristics.

The drawing force refers to the force of each pass during the cold rolling process. The larger the drawing force, the greater the pressure on the material, which may cause the material to deform and deform. Therefore, it is necessary to optimize the roll pass design and select the suitable drawing force for each pass.

The product design has a great influence on the selection of the roll pass. The product design includes the shape and size of the product, the wall thickness and the part of the product to be bent. These factors determine the number of passes, the pass tension, the cross section of the pass, the pitch and the profile of the pass.

The material properties also have an effect on the cold bending roll pass design. The yield strength, tensile strength and elongation of the material influence the dimensions of the cold bending roll pass, such as the size and shape of the pass, the profile of the pass and the pitch of the pass.

The board characteristics also play an important role in the cold bending roll pass design. For example, the board size, board thickness, board strength and board type determine the number of passes in the cold bending roll pass design.

The cold bending roll pass design is the core of the cold rolling process. It must consider the drawing force, the product design, the material properties and the board characteristics, so as to ensure the quality, reduce the cost and ensure the smooth operation of the cold rolling process.