Fine blanking technology has been developed on the basis of ordinary stamping technology. Fine blanking can achieve a level of precision and quality close to that of machining, especially in terms of the quality of the cut surface.
However, fine blanking technology places higher demands on equipment and molds, and its system is more complex. Although it is possible to use ordinary punch presses to achieve edge cutting similar to fine blanking, the accuracy of the punch press and the lifespan of the mold are always insufficient for large-scale production.
In recent years, in countries with advanced stamping technology, a new stamping technology has been developed that can achieve precision cutting effects using ordinary stamping methods.
The reason why traditional fine blanking can achieve a full bright-cut surface is mainly due to the three-motion function of the fine blanking machine, which compresses the material of the cut surface through the mold during cutting to avoid the tearing problem that occurs in ordinary stamping due to the last shear.
The amount of tearing in ordinary stamping is related to the clearance and material of the mold. For the same material, the smaller the cutting clearance, the smaller the tearing zone. Theory suggests that a full bright-cut surface can be obtained when the clearance is small enough. However, due to the higher precision and rigidity requirements of ordinary stamping machines, if the mold clearance is too small, the lifespan of the mold cannot be ensured, and therefore, batch fine blanking production can only be done with special fine blanking machines and molds.
In recent years, with the rapid development of stamping technology, stamping equipment, mold materials, and processing technology have all been significantly developed, and using ordinary stamping technology to achieve fine blanking has been widely used in actual production.
This technology relies on high-precision, high-rigidity punch presses and molds to achieve fine blanking effects. The key technology lies in the mold clearance, which must be small enough to meet the requirements of product section quality.
For certain products, the mold clearance needs to be µm-level, or even negative clearance. This places extremely high requirements on mold processing technology and stamping equipment. At this point, the slide guide rails of the stamping machine cannot have any clearance, and the rigidity of the punch press must be high enough to withstand eccentric and negative loads to ensure the perpendicularity of the slide's up and down movement, thus ensuring the lifespan of the mold and achieving large-scale production.
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