轴承套圈毛坯采用在通用压力机进行热挤压(或进一步辗扩),是目前国内大批量快速度轴承锻造中的主要生产工艺。目前常用的热锻模具钢是5CrMnMo、3Cr2W8V,由于模具钢供应和热处理设备等条件所限,在中小型轴承厂则采用GCr15钢来制造锻模。锻模在高温、高速、高负荷、急冷急热下工作发生早期热疲劳现象和裂纹发展过快,使模具寿命很低,挤压成型凹模寿命为2000件左右。因此模具用量大, The bearing ring blank is hot-pressed (or further expanded) in a universal press and is currently the main production process for large-volume, high-speed bearing forging in China. Currently used hot forging die steel is 5CrMnMo, 3Cr2W8V, due to die steel supply and heat treatment equipment and other conditions are limited, in the small and medium sized bearing plant is used GCr15 steel to make forging die. Forging die in the high temperature, high speed, high load, quench and heat work under the early thermal fatigue phenomenon and the rapid development of cracks, the die life is very low, extrusion die life of about 2000 pieces. Therefore, a large amount of mold,