Common problems with stamping dies In addition to mold failures

Common problems with stamping dies In addition to mold failures, there are also defects in the quality of the parts. The most common defect in the quality of the part is the size of the product. Only a few products have surface quality problems. Next, on to tell you about. First, the surface quality is unqualified: the surface quality of the stamped parts is mainly due to excessive burrs. The reason for the excessive burrs of the workpiece is firstly the wear of the die edge. The mold should be re-ground (described below) to ensure sharp edges. Secondly, the interval between the convex and concave molds is unreasonable. If the gap is too large, most of the side faces are the buffing strips, and if the gap is too small, the secondary shearing surface will appear. If the material hardness is too high, the material should be replaced or the gap should be increased. When the punching edge is too small or the trimming material is too small, the material will be pulled into the gap precision mold manufacturing  of the mold to become a flash.

At this point, it is necessary to increase the size of the lapped edge or the trimming margin. Second, the size is out of tolerance: the size is out of tolerance is a serious defect of stamping parts. In this regard, we must first check and check the design of the mold to eliminate the reasons for design and manufacture. If the tolerance is related to the thickness of the material, the thickness, material and hardness of the stamped material should be checked. In the stamping production process, the size is out of tolerance, mainly due to the wear of the mold, poor positioning and deformation of the workpiece. The edge of the mold is worn. It will cause the burr to be too large or the size of the cut to become larger, the punching becomes smaller, and the flatness is too poor, and the mold should be sharpened or replaced. Poor positioning and guidance includes no guide, guide pin or other positioning device does not work, the feeder does not relax, the positioning block wears too long, the feed distance is too long, the length of the guide plate is wrong or the guide gap is too large. The parts are deformed during production, mainly with impact deformation. For example, the blowing pressure of the product is too strong or the gravity falls and the impact is too large. When the material is squeezed or damaged during discharge, the discharge position should be cleaned up in time or the discharge space should be increased: the deformation should be improperly deformed. For example, when the top pin is improperly formulated, the spring force is not suitable, or the ejection force is too long, the elastic force should be adjusted or the position or the number of pins should be changed: the material is deformed. Some of the curved parts can not allow the material to overlap, and must be dropped every time. When the dish strain occurs, the pressure pad can be used to eliminate it; the punching and shearing deformation is mainly caused by the material being distorted.

The size is increased or the center is asymmetrical; the deformation of the chip is caused by the floating of the scrap or the fines remaining on the die face or the foreign matter and the like. Third, the surface quality is not qualified: the surface quality of the stamped parts, mainly the burr is too large. The reason for the excessive burrs of the workpiece is the wear of the cutting edge of the mold. The mold should be re-ground to ensure sharp edges. Secondly, the interval between the convex and concave molds is unreasonable. If the gap is too large, most of the sides are polished bands. If the gap is too small, the secondary shear surface will appear. If the hardness of the material is too high, the material should be replaced or the gap should be increased. When the punching edge is too small or the trimming material is too small, the material will be pulled into the gap of the mold to become a flash. At this point, it is necessary to increase the size of the lapped edge or the trimming margin. I hope my summary is useful to you.