用贝氏体球铁直接铸齿或切齿的办法来生产汽车前后桥螺旋伞齿轮,近年来在国内外已引起广泛的重视。例如美国通用汽车公司曾对此进行了大量的研究。1979年在西班牙举行的第46届国际铸造会议,我国代表团宣读了《贝氏体球墨铸铁精铸螺旋伞齿轮》,引起了各国 With bainite ductile iron directly cast or cut tooth way to produce the car before and after the bridge spiral bevel gear, in recent years at home and abroad have attracted widespread attention. For example, the United States General Motors has done a lot of research. At the 46th International Foundry Conference held in Spain in 1979, my delegation read out “Bainite ductile iron casting spiral bevel gears”