伞齿轮是三爪卡盘的主要锻件之一,目前都在空气锤上用胎模锻造,锻件质量差,劳动强度大。我厂380毫米三爪自定心卡盘上的伞齿轮采用热挤压工艺,收到了良好的效果。它不仅减轻了劳动强度,改善了劳动条件,也提高了劳动生产率和材料自利用率,同时也提高了锻件的质量。锻件废品率由原来的2.5％左右降到0.05％左右。过去在空气锤上胎模锻每班需要6～7人操作,班产只有四百件左右,现在改为热挤压每班只需3～4人,班产能达一 Bevel gear is one of the three forging jaw chuck forgings, are currently used on the air hammer with a tire forging, forging quality is poor, labor-intensive. 380 millimeters three-jaw self-centering chuck on the bevel gear using hot extrusion process, received good results. It not only reduces labor intensity, improves working conditions, but also improves labor productivity and material self-utilization, but also improves the quality of forgings. Forging scrap rate from about 2.5% down to about 0.05%. In the past on the air hammer on the tire die forging each class takes 6 to 7 operations, only about four hundred class production, now replaced by hot extrusion class only 3 to 4 people, class production capacity of a