Features of low melting point alloy mold for packaging steel strip

Features of low melting point alloy mold for packaging steel strip
　　 low melting point alloy molds are made by using low melting point metal elements as the formula, using the casting process to make mold cavities and forming punches; or using low melting point alloys as positioning, supporting and connecting substrates, and inserting steel cutting edges Used as a punching edge to make large-scale trimming, punching and other molds with complex shapes.
　　In terms of sheet metal forming, it is mainly the forming of circular, box, conical and hemispherical parts. For shallow drawn parts, because the cavity of the cavity is less stressed, it is not necessary to embed a steel cavity template in the low melting point alloy cavity in the case of the least batch. For deep-drawn parts or hemispherical parts, the low melting point alloy mold must have a blank holder, and it is best to use a simplified structure mold on a double-action punch.
　　 Compared with steel molds, 　　 low melting point alloy molds have the advantages of shorter mold manufacturing cycle and lower cost. Due to the large amount of machining and fitter processing for low melting point alloy molds using casting instead of zinc, casting a pair of low baking point alloy calibration tools usually only takes 2-6 hours. Therefore, the manufacturing cycle of molds is generally 60-90% shorter than that of steel molds. . The more complex the shape or the larger the size, the more common its superiority becomes. In addition, low melting point alloy molds only use a small amount of ordinary steel, and no special steel is needed (trimming dies and punching dies only need a small amount of tool steel for the steel edge part), which can save about 80% of steel, while hole low melting point alloys It can also be recycled and recast new molds. Therefore, the cost of making molds can be reduced by approximately 60-90% compared to steel molds. In addition, the use of low melting point alloy molds has the following advantages: ①Since the low melting point alloy has cold expansion, it can be used in the shrinkage casting method, so the precision of the mold size is high; ②The mold is cast on the press bed, no need Adjust the gap between the mold and the repair; ③The mold is easy to operate; ④The low melting point alloy is soft and suitable for non-destructive forming.
　　 low melting point alloy molds can be pressed 08, 08F, A3, B3, copper, aluminum, stainless steel, duralumin and other materials, the thickness of which is 0.3-3 mm (the maximum processing thickness of steel plate has reached 6 mm). When pressing a steel plate with a thickness of 1.5 mm, the second casting mold life can reach 3000 pieces. The current application overview of low melting point alloy forming dies is shown in Table 6-1.