What is the impact on the material in the stamping process of elastic deformation, Dalian stamping die Manufacturers tell you.

What is the impact on the material in the stamping process of elastic deformation, Dalian stamping die Manufacturers tell you.

    Stamping parts Compared with the deviation of punch and die size, is mainly derived from the die parts (blank) or unloaded from the punch (Chong Kongjian), due to elastic recovery caused by extrusion deformation, material elongation, bending of the dome. The deviation can be positive, it may be negative. The influence factors of the deviation are: punch and die clearance, material properties, shape and size of workpiece. The main factor is the punch and die clearance value. ? when the punch gap is large, the material tensile action increases, punching after the end, due to the elastic recovery of the blanking dimension shrinkage to the real direction, the blank size is smaller than the die size, punching punch diameter larger than the diameter.

The material properties directly determines the deformation of the material in the stamping process of elastic. The soft elastic deformation is small, after punching the elastic recovery is small; the elastic recovery of a large amount of steel. The influence of these factors in a certain Stamping die The manufacturing accuracy of this premise discussed. If the stamping die edge of low manufacturing accuracy, precision stamping parts manufacturing is also unable to guarantee. The size of the same size and stamping die. When the gap is small, because the material by the punch and die extrusion pressure, the press after the elastic recovery of the material so that the blank size increases, punching diameter becomes smaller. Factors of size and material properties, the variation of size thickness and rolling direction on. Therefore, manufacturing tolerances of convex and concave edge must be determined according to the workpiece size requirements. In addition, the structure and positioning method of punching die has a great effect on the positioning hole size precision, which will be described in the punching die structure.

The abrasive wear of hard particles in the contact surface between blank and die, or blank surface of the protrusion, scraping the mold surface caused by material falling phenomenon called abrasive wear. Adhesive wear blank and die surface relative motion, due to uneven surface, adhesion shear fracture, the mold surface material transfer or shedding phenomenon known as adhesive wear. Die in contact with the blank, and by the interaction of the relative motion of the wear. When the wear of the mold size, accuracy and surface quality changes and not out of qualified products, known as the wear failure and wear failure is the main failure form of the mold, the normal failure mode of die, inevitable.

According to the wear mechanism, wear can be divided into abrasive wear, adhesive wear, fatigue wear and corrosion wear. Fatigue wear of billet and mold surface relative motion under cyclic stress, the surface fatigue phenomenon known as fatigue wear off. Corrosion and wear in the friction process, the mold surface and the surrounding medium for chemical or electrochemical reaction caused by surface material shedding phenomenon known as corrosion and wear. In the die and billet in the process of relative motion, the actual wear is very complex. The emergence of a variety of wear forms may work, promote mutually, and finally to a form of wear failure.