**1.How to choose a metal stamping manufacturer? How many tons of stamping machine fits my demand?**

You might be wondering that how to choose a metal stamping manufacturer, because different product has different requirement. In order to avoid the insufficient tonnage of the stamping unit, which will subsequently cause difficulty in assembling the product and other dimensional issues. Therefore, choosing a metal stamping factory has become a very important topic. You should first understand whether the stamping factory has the tonnage that meets your product needs.

**2. A stamping factory with inspection instruments is crucial!**

In addition to finding a stamping machine that meets the tonnage of your demand, it is crucial that an inspection instruments are necessary within your consideration. Although many stamping experts are skillful and well experiences. Once a problem occurs, it will cause delays in the customer's delivery schedule and output.

**3. How to calculate the tonnage by choose a right stamping machines**

The tonnage of the stamping machine is closely related to the required shear strength. The harder the material, the greater the punching force required. Therefore, you need to use the stamping tonnage formula to determine how many tons of stamping machine your part requires

Before proceeding with mold design, each set of molds should first calculate the required tonnage. Generally speaking, presses with larger tonnage can handle thicker or harder materials.There are many different types of forces to consider in mold design, including blanking forces, forming forces, press forces, and stripping forces. In addition, there are two common punching force calculation formulas, which are suitable for ordinary punch machines and non-bevel edge punch machines respectively.

##### (1) The formula for calculating pressure punching force of ordinary punch press is: P=K*L*t*τ

The total length of the L profile and the material thickness T can be calculated and measured in AUTO CAD, and the shear strength of each material is different depending on the softness and hardness.

P = punching force (kgf)

k=safety factor, usually K=1.3.

L=Total circumference of the blanking profile (mm), the length of all sides of the part is added together

t=material thickness (mm)

τ=material shear strength (kgf/mm2), the physical properties of the plate can be found in the material manual.

Shear strengthτ=0.8*tensile strength of the material

For example, on a high-tensile steel plate with a thickness of 1.2mm (tensile strength 80 kgf/mm2),

When punching a 2.8mm round hole, the maximum punching force P is:

P=3.14*2.8*1.2*(0.8*80)=675kgf

(2) Calculation formula for pressure punching force of punch without inclined edge

Punching force (kn) = total circumference of punching profile (mm) * material thickness (mm) * material shear strength (kn/mm2) / 9.81 (converted to metric tons)

The total length of the L profile and the material thickness T can be calculated and measured in AUTO CAD, and the shear strength of each material is different depending on the softness and hardness.

Blanking force(kn)

L=Total circumference of the blanking profile (mm), the length of all sides of the part is added together

t=material thickness (mm)

Material shear strength (kn/mm2), physical properties of the plate.

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