Stamping die How much do you know about the gap analysis, here to introduce you.

Stamping die How much do you know about the gap analysis, here to introduce you.

The clearance of stamping die. Stamping parts Has the extremely important influence the quality of cross section. In addition, the gap of stamping die also affects the life of stamping die, precision unloading force, push force, pressure and blanking. Therefore, clearance blanking die is a very important process parameters of blanking process and stamping die design.

Influence of clearance on precision stamping? Size precision stamping refers to the difference between the actual size and basic dimensions of blanking, the less the difference is, the higher accuracy of this difference, including deviation of the two aspects, one is the relative deviation of stamping punch or die size, two is manufacturing deviation the cutting die. 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 is the premise in manufacturing precision stamping die under certain discussion. If the stamping die edge of low manufacturing accuracy, precision stamping parts manufacturing is also unable to guarantee.

Compared with stamping punch and die size deviation, 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 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. The material properties directly determines the deformation of the material in the stamping process of elastic. 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. When the long side of the rectangular outline, greater than or equal to 1.5 times the short side, will automatically search for whether there is a square and rectangle short side stamping die the same: whether there is a circular die groove width consistent on the oblong groove or round groove search, if there is a direct use of the die.

According to the following principles: the choice of stamping die can be classified as basic graphic outline, the first to die whether there is a library for stamping die and contour, the contour can be completely out of action with a punch. If the mold, stamping die set in the selection of stamping die "will be ignored, the direct use of stamping die to search. Through the above two steps has yet to die, then consider the use of a square or circular die step punching die line or arc. The first set in the selection of die stamping die, die set of "square analysis 1.5 times to the stamping line is greater than or equal to the length of the die for pressing, arc diameter is greater than the diameter of the inner circular die stamping curve. If you die set is used. If the die set is not appropriate, the system will die from small to large library for square or circular die, stamping line to meet greater than or equal to 1.5 times the length of the die.