Solution to the rebound of high-speed stamping and punching waste

In high-speed stamping, it is necessary not only to prevent the problem of the punching waste from falling into the material, but also to prevent the problem of the punching waste from jumping upward. During high-speed cold stamping, the punched waste material jumps back to the surface of the mold, which will not only cause bad indentation on the surface of the stamping part, or feed the strip to the subsequent process, which will cause the edge of the laminated stamping accident. Continuous molds that are not discovered in time may cause large quantities of parts to be unqualified, and will also cause damage to the mold, cause scrap to damage the cutting edge, and affect the overall life of the mold. The main reasons for the rebound of stamping scrap are: 1. Oil film adhesion: In order to make the convex and concave molds have good lubricity during the high-speed stamping process, and to reduce the metal adhesion between the convex and concave molds and the stamped material due to high-speed friction, it is often used Lubricating oil is applied to the sliding part of the die and the material to be punched. Lubricating oil can bring good lubrication effect, but it also produces a kind of oil film adhesion between the punch tip and the punching waste. Especially for the stamping of soft and thin materials, it often causes the scrap to rebound due to the oil film adhesion. The phenomenon. 2. Vacuum adsorption: When the stamping material is relatively soft (such as red copper, aluminum and other materials), plastic deformation will occur, which will often squeeze the tip of the punch and the waste into a vacuum state. This vacuum state exists to a certain extent Adsorption force also often takes the punching waste material out of the surface of the die, causing the waste material to bounce back. 3. Waste package caused by punch passivation: When the punch reaches a certain number of strokes, the punch edge will be passivated. The edge is no longer sharp, but forms a small R fillet, which will interfere with the punch. Hole waste material produces a waste package phenomenon that is squeezed and deepened, and the waste material forms a package clamping force on the blunt punch. The punching waste material will also be brought out of the die surface with the punch, causing the waste material to bounce back. 4. Magnetic adsorption: After the upper die is sharpened, the upper die has a strong magnetic adsorption force due to the absence of repeated demagnetization operation procedures. When the micro-hole high-speed stamping processing material is silicon steel sheet, etc., it is easy to be magnetically attracted When the material is used, the punching waste will be brought out due to the magnetic adsorption force of the upper die of the punching die, causing the waste to bounce back. Preventing punching waste from rebounding In addition to the above-mentioned three mold structural design measures, as an external factor of the mold, it is also possible to use as little lubricating oil as possible to reduce the probability of occurrence of waste rebounding due to oil film adhesion. Carefully do the demagnetization process after each sharpening to reduce the probability of scrap rebound caused by magnetic adsorption. If possible, a compressed air stripping device can be used, and so on. Recommended article: The principle of the feeder and the adjustment of the feeding step Previous: Notice of the Spring Festival holiday (official holiday on the 25th of the twelfth lunar month)