What do I need to know about selecting the right tonnage equipment for metal stamping parts? Share with you

The production of metal stamping molds needs to rely on punches (presses) to provide power. Different stamping mold sizes and structure types need to be matched with different punches. A reasonable choice of punching machine can reduce costs and save resources. This is one of the basic theoretical knowledge that stampers need to understand. The main criteria for selecting a punching machine for metal stamping die is to measure the tonnage, which is usually obtained by the sum of the punching force, forming force, blanking force, and stripping force of the die. Among them, the punching force is the main focus. The punching force is not fixed, and the force changes during a stamping process as follows: When the punch starts to contact the stamped product, the punching force is always increasing. When the punch punches into about 1/3 of the thickness of the product material, the punching force reaches the maximum value. Then the force will gradually decrease due to the appearance of the material fracture zone. Therefore, for the calculation of the punching force, the maximum punching force can be calculated. Calculation of blanking force The calculation formula of blanking force for ordinary stamping parts: Pu003dL*t*KS Kg (Note: P is the force required for blanking, the unit is Kg; L is the total contour circumference of the blanking product, The unit is mm; t is the thickness of the material, the unit is mm; KS is the shear strength of the material, the unit is Kg/mm²) Generally, when the metal stamping parts are made of mild steel, the specific values u200bu200bof the shear strength of the material are as follows: KS u003d 35kg / mm² Take an example: suppose that the metal stamping parts have a material thickness of tu003d1.2, and the material is mild steel plate, and the product needs to be punched out of a rectangular plate with an outline of 500mmx700mm. What is the punching force? According to the calculation formula: Pu003dL×t ×Ks Lu003d(500+700)×2u003d2400 tu003d1.2, Ksu003d35Kg/mm² Therefore, Pu003d2400×1.2×35u003d100800Kg u003d 100T and the tonnage selection needs to be pre-added by 20~30%. Therefore, the tonnage It is calculated to be about 120 to 130 tons. [Related recommendation] Learn more: How much do you know about new energy automobile stamping parts? Learn more: Experience sharing in the stamping processing industry Learn more: How to draw a drawing of precision metal stamping parts, please understand these steps