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How to calculate the drawing force and pressing force of cylindrical metal stamping parts?

by:Fortuna     2021-03-05
Professional processing of metal stamping parts, mechanical parts, carbon steel parts, how to calculate the drawing force and pressing force of cylindrical metal stamping parts? The stamping manufacturer will take you to take a look; 1. The determination of the drawing force; because the factors affecting the drawing force are more complicated, it is difficult to accurately calculate the drawing force according to the actual force and deformation. Therefore, in actual production, it is usually Based on the tensile stress of the dangerous section not exceeding the tensile strength of the material, the calculation is carried out using an empirical formula. For cylindrical metal stamping parts, the formula for the first deep drawing is: Fu003dK1πditσb and each subsequent deep drawing Fu003dK2πditσb (iu003d2,3,,n) where F----drawing force, N; d 1 d 2d n------the diameter of each drawing process, mm; t-----the thickness of the sheet, mm; σb---the tensile strength of the drawing material, MPa; k1, K2- -------The correction factor is related to the drawing coefficient; 2. The role of the pressing force in the metal stamping process is to prevent the blank from wrinkling during the drawing process, and the size of the pressing force should be appropriate If the pressing force is too small, the anti-wrinkle effect is not good; if the pressing force is too large, it will increase the tensile stress on the dangerous section of the force transmission area, which will cause serious thinning or even cracking. Therefore, it is necessary to ensure that the blank is deformed On the premise that there is no wrinkle in the area, try to choose a smaller pressing force. It should be pointed out that the size of the pressing force should be allowed to be adjusted within a certain range. Generally speaking, as the drawing coefficient decreases, the pressing force The allowable adjustment range is reduced. This is unfavorable to the deep drawing work, because at this time, when the pressing force is slightly larger, cracks will occur, and when the pressing force is smaller, wrinkles will occur. This is also the process stability of deep drawing is not good. On the contrary, deep drawing When the coefficient is larger, the adjustable range of the pressing force is enlarged, and the process stability is better. The blanking force can be calculated according to the following empirical formula; Any shape of deep-drawn stampings; FYu003dAPFY-----Blanking force, N; A------The projected area of u200bu200bthe blank under the blanking ring, mm2; P------Pressing force per unit area, MPa Article recommendation: How to repair the stamping die? Stamping parts processing manufacturers need to know about the previous article: How to repair the stamping die? Stamping parts processing manufacturers need to know
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