How to calculate the punch strength when punching?

P stamping =P blanking +P discharging +P pushing +P blank holder force +P drawing force. (Don't count if there is none according to the mold type)

1, the punching force is to select the tonnage of the punching machine and carry out die strength. Stiffness check foundation.

2. Punching force: Punching force and its influencing factors: the action of separating sheet metal is called punching force. Main factors affecting blanking force:

Calculation of blanking force;

Formula: P=K*L*t*τ

P—— punching force of flat edge (n);

T—— material thickness (mm);

L—— punching circumference (mm);

τ-material shear strength (MPa); Check the manual. Different materials are different.

The punch presses the material to plastically deform it, thus obtaining the required shape and accuracy. Therefore, it is necessary to cooperate with a set of molds to put the material between them, and the machine applies pressure to deform it. The reaction force caused by the force applied to the material during machining is absorbed by the main body of the punching machine.

Extended data:

The purpose of using linkage mechanism is to shorten the processing cycle while limiting the drawing speed. By reducing the speed change of the drawing process, the approaching stroke from the top dead center to the processing starting point and the returning stroke from the bottom dead center to the top dead center are accelerated, which makes it shorter than the stroke of the crankshaft punch, thus improving the productivity.

This kind of punch has been used for deep drawing of cylindrical containers since ancient times, and its mesa is narrow, but it is used to process the main panel of automobile, and its mesa is wide.

As a new stamping method, hydraulic stamping has incomparable advantages in stamping hollow parts and crankshaft parts.

Hydraulic stamping does not need a female die in the whole stamping process, which has great advantages in solving the problem that the female die can not be put into the part because the internal size is too small or the axis is bent. At the same time, replacing laser drilling with hydraulic punching plays an important role in reducing the production cost of parts and improving production efficiency.

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