In the composite die forging of gears, when the inner hole of the forging is large and the height is small, in order to avoid the occurrence of folding or piercing cracks around the skin, it can accommodate excess metal and is more labor-saving in the case of punching; The flat bottom arch bottom composite skin form of the above two advantages.
Gear composite die forging should correctly calculate the forging weight, dry ferrous sulfate to select the optimum blank specification for the blank specification and intermediate blank shape and size. The shape and size of the gear punching skin are equivalent to the intermediate blank after the roughing or pre-forging, which is close to the shape and size of the thrust pad forging, thereby reducing the impact of the blank in the final forging die. The number of times, the deformation force is small, it is easy to fill the final forging die, reduce the wear of the final forging die, improve the service life of the forging die, improve the quality of the forging, and the oil-cooled electric drum improves the utilization rate of the material and has high forging efficiency. The process stability is good.
Considering that the thrust pad forging can heat the gear through the skin, the final forging temperature is high, the deformation force is small, the size of the nut gasket is required, and the punching and punching are facilitated. The shape of the forging is too thin, and the forging is easily deformed when punching the edge. In order to meet the disadvantages of large batch size, high work efficiency, low manufacturing cost, simple operation, reliable use, and overcome the disadvantages of simple and composite molds, The push pad trimming punching die is designed as a continuous die. Cold cut edges are used for punching. After punching and trimming, the deformation of the forging is small, and the efficiency of centralized correction is higher. The trimming punching continuous die has the advantages of simple structure, convenient operation, safety and reliability, high efficiency and low manufacturing cost, and overcomes the shortcomings of the simple die and the composite die, and satisfies the needs of mass production.
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