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What Are The Reasons For Tensile Cracking Of Stainless Steel
Original: | Author: DGMF Mold Clamps | Publish Time: 2020-08-03 | 7984 Views | Share:
What are the reasons for the cracking of stainless steel material during stretching?


3. Choose reasonable convex and concave die fillets. The die fillet has a great relationship with stress size and distribution. The radius of the fillet is large, and the pressing area of the blank holder is insufficient, which is prone to instability and wrinkles; if the fillet is too small, the resistance of the material into the die during the deformation process will increase, and the material will not easily flow and transfer inward. Increase the maximum tensile stress in the force transmission area, which may cause tensile cracks. 


Therefore, it is very important to choose a reasonable radius of convex and concave corners. When the relative fillet radius RP/t of the punch is about 4, it is most beneficial to prevent cracking. The relative fillet radius of the concave mold and the convex mold increases, and the extreme deformation degree will increase. When the relative fillet radius of the concave mold is 5mm to 8mm, it is helpful to prevent cracking.


4. The researchers who used the tape thinning for deep drawing have also proved through experiments that the use of tape thinning for deep drawing can greatly reduce the maximum value of the tangential residual stress of the drawn part and effectively prevent the occurrence of longitudinal cracks. According to the different degrees of deformation and original sheet thickness, choose the appropriate thinning factor Ψn (generally 0.9t