Several problems that are easy to appear in the production process of progressive die

1. Increased product burrs. After the mold is produced for a period of time, the burrs of the production parts will increase. At this time, the convex and concave die cutting edges should be checked. If the cutting edges are worn or chipped, they should be sharpened and sharpened. After that, pad the punch or die with a gasket of corresponding thickness. After the die has been sharpened for many times, it should be checked whether the straight wall of the cutting edge has been ground. If there is no straight wall of the cutting edge, the die insert should be replaced. If the convex and concave die cutting edges are not worn, and the burrs on the parts The unevenness is due to the offset of the blanking gap, and the gap should be adjusted at this time.　　2. Floating of waste materials. 　　 In stamping production, the floating up of waste materials is a problem that has a greater impact. It not only affects production, but even damages the mold. Generally speaking, regular-shaped waste materials such as round or square are prone to floating up, while irregularly-shaped waste materials with more complex shapes are less likely to float up.　　 Here are some reasons and solutions for the floating of waste materials.　　 (1) The blanking gap is large. If the scraps often float up during the trial phase, the blanking gap is too large. The die should be re-made and the blanking gap should be reduced. If the waste material floats occasionally, you can use electric spark discharge in the cavity of the cavity to increase the roughness.　　(2) The surface of the punch is too smooth, and the waste material adheres to the punch under the action of atmospheric pressure, which can increase pores on the punch.　　 (3) Single-side blanking produces waste materials floating up, and sharp corners are added to squeeze the waste materials on the side that is not blanked.　　(4) The stamping speed is higher, so you should consider reducing the speed. If the speed cannot be reduced due to production needs, you can add ejector pins on the punch to push down the waste.　　 In addition, there are also some human factors, such as insufficient demagnetization after the cutting edge, and excessive use of punching oil during production. These should be avoided as much as possible.　　3, the phenomenon of overlapping parts 　　 in the stamping production. After the last station is cut off, the production parts are blown out of the mold in time, and they remain on the mold, which is very easy to produce the phenomenon of overlapping parts. Stacked parts are very dangerous, and it is easy to damage the mold. There are many factors that produce overlapping parts, such as insufficient air blowing wind, adhesion of punching oil, and production parts hooking on the ejector rod. In response to these factors, a variety of measures can be taken to prevent the occurrence of overlapping documents. For example, in stamping production, it is necessary to ensure that the blowing wind is large enough. When designing the mold, add ejector pins on both the concave template and the unloading plate. The ejector pin on the concave template should be designed to be larger, at least larger than the hole on the part. Larger, or simply adopt the material block structure to avoid the production parts from hooking on the ejector rod. When designing the concave template, under the premise of ensuring the punching strength, a wider slope should be designed at the end of the concave template so that the production parts can smoothly slide out of the mold. In addition, when designing, it should also be considered in the last station to make the cattle parts to be cut out of the concave template or at least one-half of the slope, and try to rely on the weight of the production parts to slide out of the mold.　　4. Blockage of the leakage hole 　　 In stamping production, if there is a blockage of the material hole and it is not found in time, it is easy to damage the mold, causing the punch to break or the cavity to burst. It is necessary to prevent the leakage hole from being clogged to ensure smooth leakage. The size of the leakage hole must be set. For some small protruding parts, the size of the leakage hole should be appropriately enlarged; and for the blockage of the leakage hole caused by the roll of waste, the size of the leakage hole should be reduced. When designing the mold, sufficient attention should be paid to the leakage hole. When designing the die backing plate, the concave template should be used as a reference to ensure that the contour of the concave die backing plate is larger than that of the concave template. When designing the lower mold base, The die pad is a reference. And so on. Finally, it is necessary to ensure that the material leakage hole of the mounting plate is smaller than the material leakage hole of the machine tool, otherwise, a slope must be opened on the lower mounting plate to ensure that the waste material eventually slips into the material leakage hole of the machine tool.　　 In addition, the die edge grinding dam or excessive stamping oil will cause the leaking hole to be blocked, so it is necessary to sharpen it in time or reduce the replacement of stamping oil.　　5. Poor feeding 　　 Poor feeding will affect production in the slightest, and damage the mold in severe cases. The reasons are as follows: 　　 (1) The delivery distance is different from the designed step during production, and the delivery distance should be adjusted.　　 (2) The spacing of the material lifting nails is too large, and the number of material lifting nails should be increased.　　(3) The lifting height of the strip is not enough, and the strip is easy to hook on the lifting block or the ejector rod. The lifting height of the strip should be increased.　　 (4) The feeding gap of the lifting nail is too small, and the strip feeding is not smooth, so the gap should be enlarged appropriately.　　(5) If the strip is too wide or thin, it is easy to produce a warped shirt. A lifting block should be added in the middle of the strip.