On the cold bending forming production line, punching is a crucial process. Different customers have different requirements for hole diameter, hole spacing, and layout method. Therefore, when designing the production line, a punching layout diagram must be drawn based on actual needs, and the equipment tonnage and punching method should be reasonably matched.

1.The function of the punching layout drawing
The punching layout drawing is mainly used for:
Defining the size, spacing and position of the holes;
Determining the mold structure and the installation method of the press machine;
Providing a basis for calculating the punching force and the tonnage of the equipment.
In other words, the punching layout drawing is not merely a construction drawing; it is also the foundation for the punching plan and the selection of equipment.

2. Matching of tonnage and punching method
Mechanical punching machine: Suitable for scenarios with smaller hole diameters, regular layout, and high production volume. It is fast but has poor flexibility.
Hydraulic punching: Suitable for situations with diverse hole diameters or complex layouts. It has high flexibility and is convenient for mold replacement, but the speed is relatively slow.
When choosing the tonnage, the actual punching pressure needs to be calculated based on the hole diameter, plate thickness, and number of holes, and a 20–30% safety margin should be reserved. For example:
Thin plates, small hole spacing: 20 - 40 tons will suffice;
Thick plates, large hole diameter: may require more than 80 tons.

3. Customer Notifications
Each customer has different requirements for punching. First, confirm the punching layout diagram, then determine the punch press configuration;
The punching layout diagram is directly related to the tonnage of the selected punch press and the punching method, and must not be disconnected;
During the initial communication, providing an accurate layout diagram can avoid repeated modifications of the mold in the later stage, saving time and costs.