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模锻通常都在模锻锤或摩擦压力机上进行。但我国现有的模锻锤,能源消耗大,模具造价高、寿命低,而且锻件的余量大;摩擦压力机则行程速度慢,垂直方向的锻件高度随每次落下高度不同或打击次数不一而有很大差异。精密缝纫机锻件要求余量只有1毫米,公差0.2毫米以下,并且约有80％的面不再机械加工。经过试生产,用上述两种设备都很难满足要求。我们分析了机械压力机的一些固有特点,通过一段生产实践,终于在400吨开式压力机上生产出余量仅为1毫米、公差0.15～0.2毫米、水平分模面错移量不超过0.2～0.3毫米的
Forging is usually done on forging hammers or friction presses. However, the existing forging hammers in our country have high energy consumption, high mold cost, low service life and large forging allowance. The friction press has a slow stroke speed and the height of vertical forging varies with each drop or the number of hits is not There is a big difference Precision sewing machine forging requirements margin of only 1 mm, 0.2 mm tolerance below, and about 80% of the surface is no longer machined. After trial production, with the above two kinds of equipment are difficult to meet the requirements. We analyzed some of the inherent characteristics of mechanical presses, through a period of production practice, and finally in the 400-ton open press to produce a margin of only 1 mm, tolerance of 0.15 to 0.2 mm, the level of the surface error of not more than 0.2 ~ 0.3 mm