Press tonnage refers to the highest amount of force that a press exerts during a stamping operation. It is an important metric to understand to ensure that a stamping operation is completed successfully and safely.
In this article, we look at what press tonnage is, why it is important, how it is calculated, and the factors that affect it.
What Is Press Tonnage?
Press tonnage is the highest amount of force that a press exerts during a stamping operation. It is an important metric for manufacturers to understand, as it is used to determine the tonnage required for an operation and ensure that it is below the maximum tonnage rating of the stamping press.
Two concepts that are closely related to press tonnage are reverse tonnage and snap-through. Snap-through refers to the quick acceleration of the press once it cuts through the material. This results in vibrations which may cause damage to the press. Reverse tonnage refers to the strain limitations of the connections between components in the press.
What Is the Importance of Performing a Press Tonnage Test?
A press tonnage test is performed to verify the tonnage required to perform a certain operation. It is very important, as too much tonnage can cause damage to the press, while too little tonnage can lead to low-quality parts. As part of the press tonnage test, the speed of the stroke can also be adjusted to ensure that snap-through and reverse tonnage are at manageable levels.
How Is Press Tonnage Used in the Stamping Process or for an Alternative Service?
Press tonnage is used in the stamping process in several ways as described below:
Press Capacity: The press tonnage capacity is the maximum press tonnage that a press can handle before being damaged.
Required Press Tonnage: Required press tonnage is the amount of tonnage required to perform a stamping operation.
Press Tonnage Curve: The press tonnage curve shows how the tonnage of a press is applied across the entire stroke of the press. Typically, the tonnage will not be as high as the press tonnage capacity at all points of the curve. For example, with mechanical presses, the tonnage is at its highest at the very top and very bottom of the stroke.
Understanding these press-tonnage-related metrics allows manufacturers to produce high-quality stamped parts safely and effectively.
What Factors Affect the Press Tonnage for the Stamping Process?
Эти press tonnage for stamping press operations is affected by the following:
Material Thickness: Thicker materials require higher press tonnages to process.
Material Properties: The tensile strength and shear strength of the material play a big role in the press tonnage required for a specific operation.
Geometry of Operation: Complex geometries and geometries with longer perimeters will require higher press tonnages than simpler, shorter geometries.
Type of Operation: Each type of operation (blanking, punching, deep drawing, bending, etc.) has its formula for calculating the required press tonnage.
Is It Important To Determine the Press Tonnage for a Stamping Process?
It is very important to determine the press tonnage of a stamping process. The required tonnage of a specific operation needs to be understood to ensure it does not exceed the tonnage capacity of the press. Doing so can result in damage to the press as well as potential safety hazards.
How To Calculate the Press Tonnage of a Material?
The required press tonnage of a material depends on many factors, including the type of operation, material tensile strength, material thickness, and material shear strength.
For example, for punching a square hole, the following formula is used:
Tonnage = P * T * S9.81
Где:
P = Total length of the hole being cut in mm
T = Thickness of the material in mm
S = Shear strength of the material in kn/mm2
What Are the Different Types of Press Tonnage?
Different types of presses have different press tonnage capacities and ways of calculating press tonnage. Below is a list of some of these presses, and how their press tonnage is calculated:
1. Hydraulic Press Tonnage
Hydraulic presses use hydraulic cylinders to produce force on the material. They can deliver full tonnage over the entire stroke, unlike mechanical presses. They are also very reliable, requiring little maintenance. However, their stroke speed and depth can be limited.
The press tonnage of a hydraulic press can be determined in the same way as for mechanical presses. The required press tonnage for a cutting or blanking operation can be determined using the following equation:
Tonnage = P * T * S9.81
Where P is the total length of the hole being cut in mm, T is the thickness of the material in mm, and S is the material’s shear strength in kn/mm2.
2. Mechanical Press Tonnage
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XTJ — ведущий OEM-производитель, который занимается предоставлением комплексных решений от прототипа до производства. Мы гордимся тем, что являемся сертифицированной системой управления качеством ISO 9001, и стремимся создавать ценность в каждом клиентском взаимодействии. Мы достигаем этого через сотрудничество, инновации, улучшение процессов и исключительное мастерство.
