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Sheet thickness is one of the key factors in determining the tonnage required by the bending machine. In general, the thicker the sheet metal, the larger the press brake tonnage required. This is because thicker sheet metal requires more pressure during the bending process to achieve the desired bending angle and shape. Therefore, when selecting the bending machine, the appropriate tonnage must be determined according to the thickness of the sheet that needs to be processed.
Definition and Selection of Bending Machine TonnageThe tonnage of the bending machine refers to the maximum pressure that the bending technology can exert during the bending process, usually expressed in tons or kN. The size of this pressure directly determines the thickness and length of the sheet that the bending machine can handle. In the selection of the bending machine, it is necessary to comprehensively consider the material, thickness, length and bending angle of the plate required to be processed to ensure that the tonnage of the selected bending machine can meet the processing needs.
In order to more accurately determine the relationship between sheet thickness and press brake tonnage, the f ollowing formula can be used for calculation:
P=650×S²×L/V
P – nominal force of the bending machine (KN)
S – Thickness of folded plate (mm)
L – Width of folded plate (m)
V – Width of lower mold opening (mm)
The opening width of the lower die is generally 8~10 times the thickness of the folded plate. Besides, different materials of the plate metal on the bending machine requirements are also different, so in the calculation also need to consider the coefficient of the material. For example, bronze (soft) and aluminum (soft) have a coefficient of 0.5, and stainless steel and chrome-molybdenum steel have a coefficient of 2.
For example, if the plate to be folded is ordinary steel, the thickness is 8mm, the width is 4mm, then you can calculate the width of the die opening V=10 times the plate thickness S to calculate:
P=650×8²×4/（10×8）=2080KN=208T
It can be seen that a 200T bending machine can basically load ordinary steel of 8mm thick and 4m wide. If the same stainless steel plate is 8mm thick and 4m wide, because the coefficient of stainless steel is 2, the required bending machine tonnage is twice that of 416T, that is, 400T or so.
In addition to the thickness of the sheet and the tonnage of the bending machine, there are several other key factors that affect the bending effect.
Plate Material: Different materials of the plate metal has different physical and chemical properties, the requirements of the bending machine are also different. For example, hard materials such as stainless steel and chrome-molybdenum steel require greater pressure to achieve bending.
Bending Angle and Bending Radius: The bending angle and bending radius will also affect the choice of bending machine and bending effect. Smaller bending angles and bending radii require greater pressure and more precise machine control.
Skill Level and Experience of the Operator: The skill level and experience of the operator are also important factors affecting the bending effect. Skilled operators can more accurately control the operating parameters and processing of the bending machine, thereby improving the bending quality and efficiency.
In summary, there is a close relationship between the thickness of the plate and the tonnage of the bending machine. In the selection of bending machine, should be based on the actual needs of the tonnage, plate material, thickness and bending angle and other factors. At the same time, improving the skill level and experience of the operator is also the key to ensure the bending effect.
When it comes to press brake metal thickness guidelines, it is important to consider the recommended ranges for different types of presses and configurations. These guidelines serve as a valuable reference for fabricators, engineers, and hobbyists looking to achieve accurate and reliable results in their metal bending projects.
Here are the recommended metal thickness ranges for different press brake types and configurations:
Manual Press Brakes: These press brakes are typically used for lighter gauge materials and are operated manually. The recommended metal thickness range for manual press brakes is usually between 18 gauge (0.0478 inches) to 10 gauge (0.135 inches).
Hydraulic Press Brakes: Hydraulic press brakes are more powerful and efficient compared to manual ones. They are suitable for a wider range of metal thicknesses. The recommended metal thickness range for hydraulic press brakes can vary depending on the specific model and tonnage capacity. However, as a general guideline, they can handle metal thicknesses ranging from 24 gauge (0.0239 inches) to 1/2 inch (0.500 inches) or more.
CNC Press Brakes: CNC press brakes offer precise control and automation, making them ideal for complex bending operations. These machines can handle a wide range of metal thicknesses, with recommended ranges typically starting from 24 gauge (0.0239 inches) and going up to several inches.
It is important to note that these metal thickness ranges are general recommendations and may vary depending on the specific press brake model, tooling, and other factors. Always refer to the manufacturer’s guidelines and consult with experts to determine the most appropriate metal thickness range for your specific project.
In conclusion, understanding the relationship between sheet metal thickness and press brake tonnage is essential for selecting the right machine. Consider material, thickness, and bending requirements to ensure optimal performance and efficiency.
